JPH07219687A - Power saving mode control circuit - Google Patents

Abstract

PURPOSE:To obtain the power-saving mode control circuit which does not require an auxiliary power circuit by driving an element such as a photocoupler directly with a power-saving mode control signal. CONSTITUTION:This circuit is provided with the high-sensitivity element such as the high-sensitivity photocoupler 25 which is connected in parallel to a power- saving mode signal processing circuit 23 that performs signal processing according to the power-saving mode control signal and driven according to the control signal to stop a switching IC 13 provided in a primary-side circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power saving mode control circuit which minimizes power consumption of an electronic device when the electronic device is in a standby state.

[0002]

2. Description of the Related Art FIG. 21 is a block diagram showing a power saving mode control circuit used as an internal circuit of a conventional electronic device such as a display monitor or a printer.
Is an AC power supply for supplying a power supply such as AC100V to the primary side circuit, 2 is a rectifying diode block, 3 is a rectifying capacitor, 4 is an output transformer for supplying power to the secondary side circuit of the power saving mode control circuit, and 5 is A switching IC that operates and stops the output transformer 4, 6 is a rectifying diode, and 7 is a smoothing capacitor. The output transformer 4, the switching IC 5, the rectifying diode 6, and the smoothing capacitor 7 form a secondary side circuit. An auxiliary power supply circuit that supplies power to the power saving mode control circuit is configured. 8 is a terminal for inputting a power saving mode control signal from the outside, 9 is a buffer for temporarily storing the power saving mode control signal, 10 is a microcomputer for outputting a drive signal in response to the power saving mode control signal from the buffer 9, etc. The buffer 9 and the controller 10 are supplied with power from an auxiliary power supply circuit.

Reference numeral 11 is a relay that opens and closes in response to a drive signal from the controller 10 and outputs the power saving mode control signal input from the secondary side circuit to the primary side circuit. 12 is a power source for the load 16 of the secondary side circuit. An output transformer to supply.
The load 16 is, for example, a deflection coil or a cathode ray tube if it is compatible with a display monitor. Reference numeral 13 is a switching IC that operates and stops the output transformer 12 according to opening and closing of the relay 11.
2 by output transformer 12 and switching IC 13
Load of display monitor or printer of secondary circuit 16
A main power supply circuit that supplies power to the. Reference numeral 14 is a rectifying diode, and 15 is a smoothing capacitor. Reference numeral 17 is a resistor that limits the potential of the signal output to the switching IC 13 and the current flowing through the contact of the relay 11. In addition,
The grounds of the primary side circuit and the secondary side circuit are separated as shown by the symbol difference in the drawing.

Next, the operation will be described. Generally, in display monitors and printers, when the main power of the display monitor is on but it is not necessary to display the screen,
Or, when the main power supply of the printer is turned on but there is no need to print out, the load on the secondary side circuit 1
Although the power consumption by the load 16 can be reduced to 0 by shutting off 6 in the secondary side circuit, the output transformer 12 and the switching IC 1 of the main power supply circuit of the primary side circuit
3 is supplied with power, and power is consumed inside the transformer or the like to perform switching in a no-load state,
The power consumption of the device cannot be suppressed below 5W. Therefore, in order to further save power when the function of the electronic device is stopped, it is necessary to stop the switching IC 13 and reduce the power consumption by the output transformer 12 and the switching IC 13 to zero. The power saving mode control circuit is used for that purpose.

In the normal mode in which the screen is displayed on the display monitor or the printer outputs the print, the relay 11 is closed, and the switching IC 13 operates to supply power to the load 16 via the output transformer 12. Is supplied. After that, when the functions of the electronic devices are stopped from the normal mode, and when the mode is shifted to the power saving mode for further power saving, the power saving mode control signal is input to the power saving mode control circuit. Since the power mode control signal has a common ground with the secondary circuit, the power saving mode control signal is input from the terminal 8 of the secondary circuit.

The buffer 9 temporarily stores the power saving mode control signal input from the terminal 8, and the controller 10 outputs a drive signal to the coil side of the relay 11 in response to the power saving mode control signal from the buffer 9. To do. Normally, this drive signal is set to flow to the relay 11 at about 10 to 20 mA. The contact of the relay 11 is closed by the drive signal, and outputs a signal of "L" level to the switching IC 13. The switching IC 13 to which the “L” level signal is input stops switching and cuts off the power supply to the output transformer 12. Thus, in the power saving mode, the output transformer 12 and the switching I
The power supply to C13 is cut off to increase the power saving of the electronic device.

[0007] In addition, when it is necessary to display a screen on the display monitor in the power saving mode or when it is necessary to print out in the printer, the normal mode is to restore the functions of the electronic devices from the power saving mode. However, in that case, the input of the power saving mode control signal to the terminal 8 of the power saving mode control circuit is stopped, and the control controller 10 switches from the power saving mode to the normal mode via the buffer 9. Detects transition and relay 1
The output of the drive signal to the No. 1 coil side is stopped. Therefore, the contacts of the relay 11 are opened, and the switching IC 1
The potential of the control signal output to 3 is set to "H" according to the resistance 17
Use level signal. The switching IC 13 to which the “H” level signal is input restores the switching operation and restores the power supply to the output transformer 12.

Therefore, during the transition between the normal mode and the power saving mode, the power saving mode control signal input from the terminal 8 of the secondary side circuit must be constantly monitored. The controller 10 must always supply power by the auxiliary power supply circuit and utilize its function. Note that FIG. 21 shows a conventional example using the relay 11, but FIG. 22 shows a conventional example using a photocoupler. In the figure, 18 is a photocoupler, and 19 is a resistor that limits the drive current from the controller 10. Even in this case, the buffer 9 and the controller 10 must constantly monitor the power saving mode control signal, and always supply power by the auxiliary power supply circuit.
You must make the most of the function.

[0009]

Since the conventional power saving mode control circuit is configured as described above, the terminal 8 of the secondary side circuit is detected when the transition between the normal mode and the power saving mode is detected. In order to constantly monitor the input power saving mode control signal, the buffer 9 and the controller 10 must always supply power by the auxiliary power circuit,
Therefore, the output transformer 4, the switching IC 5, the rectifying diode 6, and the smoothing capacitor 7, which are auxiliary power supply circuits, are required in the configuration, and there is a problem that the configuration is complicated and expensive.

The present invention has been made to solve the above problems, and directly drives elements such as a photocoupler according to a control signal to obtain a power saving mode control circuit that does not require an auxiliary power supply circuit. The purpose is to

[0011]

A power saving mode control circuit according to a first aspect of the present invention is connected in parallel with a signal processing circuit which processes a signal in response to a control signal, and is driven in response to the control signal. It is provided with a first high-sensitivity element for stopping the power supply drive circuit provided in the primary side circuit.

A power saving mode control circuit according to a second aspect of the present invention is connected in parallel with a signal processing circuit that outputs a power saving mode transition prohibition signal in response to a control signal, and is driven in response to the control signal. A first high-sensitivity element that outputs to the side circuit, a second high-sensitivity element that is driven according to the power saving mode transition prohibition signal output from the signal processing circuit and outputs to the primary side circuit, and the power saving thereof And a power-saving shift determination circuit that stops the power supply drive circuit in response to the control signal from the first high-sensitivity element when the mode shift inhibition signal is released.

A power saving mode control circuit according to a third aspect of the present invention is connected in parallel with a synchronization signal processing circuit that outputs a power saving mode transition prohibition signal when a synchronization signal is input,
The first high-sensitivity element driven according to the synchronizing signal and output to the primary side circuit, and driven according to the power saving mode shift prohibiting signal output from the synchronizing signal processing circuit, and output to the primary side circuit. When the second high-sensitivity element and the power-saving mode transition prohibition signal are released and the synchronization signal from the first high-sensitivity element is stopped, the power supply drive circuit is stopped,
And a power-saving shift determination circuit that restores the power supply drive circuit when the synchronization signal is input again.

A power saving mode control circuit according to a fourth aspect of the present invention is connected in parallel with a communication control signal processing circuit that outputs a power saving mode transition signal according to a communication control signal, and is driven according to the communication control signal. First output to the primary side circuit
In accordance with the high-sensitivity element, the second high-sensitivity element that is driven in response to the power-saving mode transition signal output from the communication control signal processing circuit, and outputs the primary-side circuit, and the power-saving mode transition signal. And a power-saving shift determination circuit that stops the power supply drive circuit and restores the operation of the power supply drive circuit in response to the communication control signal from the first high-sensitivity element.

A power saving mode control circuit according to a fifth aspect of the present invention is connected in parallel with a communication control signal processing circuit that outputs a power saving mode transition prohibition signal in response to a communication control signal, and is input from an external circuit thereof. A first high-sensitivity element that is driven according to a communication control signal and outputs to the primary side circuit, and is driven according to a power saving mode transition prohibition signal that is output from the communication control signal processing circuit and is output to the primary side circuit. The second high-sensitivity element and the power-saving mode transition prohibition signal are released, the power-source drive circuit is stopped and the power-source drive circuit is stopped according to the communication control signal from the first high-sensitivity element. And a power-saving shift determination circuit that restores the operation of.

A power saving mode control circuit according to a sixth aspect of the present invention is connected in parallel with a sync-on-green signal processing circuit which processes a signal according to the sync-on-green signal, and is driven according to the sync-on-green signal. A first high-sensitivity element that is output to the secondary circuit, an amplifier circuit that amplifies the sync-on-green signal that is output from the first high-sensitivity element, and a potential that is equal to or greater than a predetermined value of the amplified sync-on-green signal. And a predetermined value potential limiting circuit that outputs a signal including a horizontal / vertical synchronizing component in the sync-on-green signal, and a power supply driving circuit according to the stop and input of the signal including the horizontal / vertical synchronizing component. And a power-saving shift determination circuit that restores the operation.

According to a seventh aspect of the power saving mode control circuit of the present invention, at least two control signals among the synchronizing signal, the communication control signal and the power saving mode control signal are input, and the power saving mode control circuit saves power according to the at least two control signals. A signal processing circuit that outputs a power mode transition prohibition signal, a high-sensitivity element group that is connected in parallel with the signal processing circuit, is driven according to at least two control signals, and outputs the primary side circuit, and the signal processing. A second high-sensitivity element driven in response to the power-saving mode shift prohibiting signal output from the circuit and output to the primary side circuit; The power supply drive circuit is stopped when at least one control signal of at least two control signals is stopped, and the stopped control signal is detected and the stopped control is performed. It is obtained by a power-saving shift determining circuit for restoring the operation of the power drive circuit in accordance with the return of the item.

A power saving mode control circuit according to the present invention separates a sync signal from a sync on green signal,
A signal processing circuit that outputs a power saving mode shift prohibition signal or a power saving mode shift signal according to the synchronization signal and the signal processing circuit that is connected in series to the input signal line of the sync on green signal An open / close circuit that opens when a signal is output and closes when a power saving mode transition signal is output, and is connected in series with the open / close circuit and in parallel with the signal processing circuit, and its sink. A first high-sensitivity element that is driven according to an on-green signal and outputs to the primary side circuit, and a primary sensitive element that is driven according to a power saving mode shift prohibition signal or a power saving mode shift signal output from the signal processing circuit A second high-sensitivity element output to the side circuit, and a sync-on-green signal sync separation that separates the sync signal from the sync-on-green signal output from the first high-sensitivity element And a power-saving transition determination circuit that stops the power-supply driving circuit in response to the power-saving mode transition signal and restores the operation of the power-supply driving circuit in response to the sync signal from the sync-on-green signal sync separation circuit. Be prepared.

[0019]

The first high-sensitivity element according to the invention of claim 1 is
Since it can be driven with a low current, it can be directly driven according to a control signal, and since the power supply drive circuit provided in the primary side circuit is stopped, the auxiliary power supply circuit is not used and the transition to the power saving mode and Performs a return to normal mode. Further, the control signal is a voltage signal of a small level, but by connecting the first high-sensitivity element and the signal processing circuit in parallel, the control signal supplied to the signal processing circuit does not cause a voltage drop. , It is possible to sufficiently perform the operation of the signal processing circuit.

In the power saving mode control circuit according to the second aspect of the present invention, in addition to the operation of the first aspect of the invention, the power saving mode shift prohibiting signal is sent from the signal processing circuit to the second high sensitivity element in accordance with the control signal. Output to the power saving transition determination circuit via
By prohibiting the transition to the power saving mode, it is possible to prevent the transition to the power saving mode when switching to the power saving mode is unnecessary.

The power saving mode control circuit according to the third aspect of the invention shifts to the power saving mode and returns to the normal mode in response to the stop and return of the synchronizing signal input from the external circuit. Further, since the first high-sensitivity element can be driven with a low current, it can be directly driven according to the synchronizing signal, and the auxiliary power supply circuit is unnecessary. Further, although the synchronizing signal is a voltage signal of a small level, the control signal supplied to the synchronizing signal processing circuit causes a voltage drop by connecting the first high-sensitivity element and the synchronizing signal processing circuit in parallel. However, it enables the operation of the synchronization signal processing circuit to be performed sufficiently. Furthermore, by outputting a power saving mode shift prohibition signal to the power saving shift determination circuit to prohibit shifting to the power saving mode,
This prevents the transition to the power saving mode when switching is not necessary when switching signals.

The power saving mode control circuit according to the invention of claim 4 shifts to the power saving mode and returns to the normal mode in response to the stop and return of the communication control signal input from the external circuit. Further, since the first high-sensitivity element can be driven with a low current, it can be directly driven according to the communication control signal, and the auxiliary power supply circuit is unnecessary. Although the communication control signal is a voltage signal of a small level, the communication control signal supplied to the communication control signal processing circuit is a voltage signal by connecting the first high-sensitivity element and the communication control signal processing circuit in parallel. It is possible to sufficiently perform the operation of the communication control signal processing circuit without causing the drop.

Since the power saving shift judging circuit in the invention of claim 5 both stops the power supply driving circuit and restores the operation in response to the communication control signal, the communication control signal processing is different from that of the invention of claim 5. The function of outputting a power saving mode transition signal by the circuit is unnecessary. In addition, the power saving mode shift prohibition signal is output to the power saving shift judging circuit to prohibit shift to the power save mode, thereby preventing shift when the shift to the power save mode is unnecessary such as signal switching. .

According to another aspect of the invention, in the power-saving mode control circuit, a signal containing horizontal / vertical synchronization components in the sync-on-green signal is separated, and the signal containing the horizontal / vertical synchronization components is stopped and input. Transition to power saving mode and return to normal mode. The first high-sensitivity element is
Since it can be driven with a low current, it can be driven directly in response to a sync-on-green signal, eliminating the need for an auxiliary power supply circuit.
Further, although the sync-on-green signal is a voltage signal of a small level, the sync-on-green signal processing circuit is connected in parallel by connecting the first high-sensitivity element and the sync-on-green signal processing circuit. The green signal does not cause a voltage drop, and it is possible to sufficiently perform the operation of the sync-on-green signal processing circuit.

In the power-saving mode control circuit according to the invention of claim 7, the power-saving shift determination circuit shifts to the normal mode in response to the restoration of the synchronization signal, the communication control signal, and the power-saving mode control signal when shifting to the power-saving mode. To do. Therefore, it is possible to handle a plurality of types of control signals. Further, since the first high-sensitivity element can be driven with a low current, it can be directly driven according to the control signal, and the auxiliary power supply circuit is unnecessary.
The control signal is a voltage signal of a small level,
By connecting the high-sensitivity element and the control signal in parallel, the control signal supplied to the signal processing circuit does not cause a voltage drop, and it is possible to sufficiently operate the signal processing circuit. Furthermore, the power saving mode shift prohibition signal is output to the power saving shift determination circuit to prohibit shifting to the power saving mode, thereby preventing shifts when switching to the power saving mode is unnecessary such as signal switching. .

In the power saving mode control circuit according to the invention of claim 8, in the normal mode, the signal of the signal processing circuit closes the switching circuit connected in series to the input signal line for inputting the sync-on-green signal, The number of circuits using the sync-on-green signal is reduced to prevent deterioration of frequency characteristics. Further, since the first high-sensitivity element can be driven with a low current, it can be directly driven according to the sync-on-green signal, and the auxiliary power supply circuit is unnecessary. Although the sync-on-green signal is a voltage signal of a small level, the control signal supplied to the signal processing circuit causes a voltage drop by connecting the first high-sensitivity element and the signal processing circuit in parallel. However, the operation of the signal processing circuit can be sufficiently performed. Furthermore, the power saving mode shift prohibition signal is output to the power saving shift determination circuit to prohibit shifting to the power saving mode, thereby preventing shifts when switching to the power saving mode is unnecessary such as signal switching. .

[0027]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram showing a power-saving mode control circuit used in an electronic device such as a display monitor and a printer corresponding to a dedicated power-saving mode control signal. In the figure, 1 is an AC power supply and 2 is a rectifying diode block. Three
Is a rectifying capacitor, 12 is an output transformer, 13 is a switching IC (power supply drive circuit), 14 is a rectifying diode, and 15 is a smoothing capacitor.
2. A power supply circuit is constituted by the rectifying diode 14 and the smoothing capacitor 15. Reference numeral 16 is a load on the display monitor or printer, and as described above, FIG.
It is equivalent to the configuration shown in.

Reference numeral 21 denotes an inverter which also serves as a terminal for inputting a power saving mode control signal which is a DC signal of 0V or 5V,
Reference numeral 23 denotes a power saving mode signal processing circuit (signal processing circuit) that uses the power supply of the secondary side circuit and performs processing according to the input of the power saving mode control signal in the normal mode, and 24 denotes the current value of the power saving mode control signal. It is a limiting resistor that limits and prevents overload of the power saving mode signal processing circuit 23. Two
5 is connected in parallel with the power saving mode signal processing circuit 23,
A photocoupler (first high-sensitivity element) which is driven according to a low-current power-saving mode control signal of 2-3 mA and stops the switching IC 13, 26 and 27 are photocouplers 25.
A zener diode and a resistor for adjusting the power supply to the.

Next, the operation will be described. This embodiment corresponds to a dedicated power saving mode control signal of a DC signal of 0V or 5V. In the normal mode, the switching IC 13 is operating, and power is supplied to the load 16 including the power saving mode signal processing circuit 23 via the output transformer 12. Next, at the time of power saving mode transition, direct current 0V from personal computer or workstation
The power saving mode control signal of is input to the inverter 21,
The LED of the photocoupler 25 is stopped and turned off, a "L" level signal is output to the switching IC 13, and the operation of the switching IC 13 is stopped. As a result,
The power supply from the output transformer 12 to the load 16 is cut off.

Further, when returning from the power saving mode to the normal mode, the power saving mode control signal of 5V is applied to the inverter 21.
Is input to the power saving mode control signal of a low current of 2 to 3 mA to drive the LED of the photocoupler 25 to turn it on,
An "H" level signal corresponding to the resistor 26 and the Zener diode 27 is output to the switching IC 13, the switching IC 13 is operated, and power is supplied from the output transformer 12 to the load 16.

As described above, by directly driving the photocoupler 25 with the power saving mode control signal input from the outside, the auxiliary power supply circuit is not required and the structure can be simplified. Further, the power saving mode signal processing circuit 23 that inputs the power saving mode control signal and uses the power saving mode control signal and the photo coupler 25 are connected in parallel, and the photo coupler 25 is a high-sensitivity element that can be driven even at a low current. Therefore, even in the power saving mode signal processing circuit 23 which can input only the low voltage power saving mode control signal, the power saving mode signal processing circuit 23 does not cause a voltage drop of the power saving mode control signal by the photocoupler 25. The operation of 23 can be sufficiently performed. Further, even if a relay as a high-sensitivity element is used instead of the photocoupler 25, the same effect can be obtained.

In the above embodiment, the switching I
Although the C13 is configured to stop with an "L" level signal and operate with a "H" level signal, it serves as a switching IC 13 that stops with an "H" level signal and operates with an "L" level signal. In this case, the same operation can be performed only by reversing the output condition of 0 V or 5 V of the power saving mode control signal.

In the above embodiment, the photo coupler 25 is used.
Connected to the control signal line of the switching IC 13, the output line of the photocoupler 25 is connected to the power supply line of the switching IC 13, and when the photocoupler 25 is off, power is supplied to the switching IC 13 to operate. Let
When the photocoupler 25 is turned on, the power supply to the switching IC 13 may be cut off to stop the operation.

Further, in the configuration of the above-mentioned embodiment, a high-sensitivity element is not used as the photocoupler 25, the power saving mode control signal is low current (2 to 3 mA), and the photocoupler 25 is directly driven by the power saving mode control signal. If it cannot be driven, the configuration shown in FIG. 2 may be adopted. In the figure, 2
Reference numeral 9 is a power supply for the primary side circuit, 30 and 31 are resistors, and 32 is a transistor. As shown in FIG. 2, the transistor 32 may be operated by the power saving mode control signal, and the photocoupler (element) 25 may be driven by the power supply of the primary side circuit. Even in this case, since the power supply for the secondary side circuit is not required, the auxiliary power supply circuit is unnecessary and the configuration can be simplified.

Example 2. In the above-mentioned Example 1, direct current 0-5
Although the case of responding to the V power saving mode control signal has been described, the display monitor and the printer switch between the normal mode and the power saving mode depending on the presence or absence of the horizontal or vertical synchronizing signal from the personal computer or the workstation. Can be processed. FIG. 3 shows claim 1.
It is a block diagram which shows the power-saving mode control circuit used for electronic devices, such as a display monitor and a printer, which respond | correspond to the synchronizing signal by one Example of 2 and 3 invention, 33 is a power supply of a secondary side circuit in the figure. A synchronous signal processing circuit (signal processing circuit) composed of a microcomputer or the like connected in parallel to the input signal line of the synchronous signal,
Is a resistor and 35 is a transistor. These resistors 34,
A signal processing circuit of another system is configured by 36 and the transistor 35. The signal processing circuits of other systems also use the power source of the secondary side circuit and are connected in parallel to the input signal line of the synchronization signal. Reference numerals 37 and 38 are photocouplers (first and second photocouplers), and 39 is a power saving transition determination circuit. 4 is a configuration diagram showing a detailed configuration of the power saving transition determination circuit 39. In the figure, reference numeral 41 is a mono-multi circuit such as HC123 and 42 is an OR circuit such as HC32.

Next, the operation will be described. In the normal mode, the synchronizing signal is input from the terminal at the pulse interval of the period b shown in FIG. 5, the LED of the photocoupler 37 is intermittently driven to be in the ON state, and the “H” level signal shown in FIG. Is output to the mono-multi circuit 41 of the power saving transition determination circuit 39. The mono-multi circuit 41 outputs a pulse for a fixed period determined by the values of the resistor R1 and the capacitor C1 to the OR circuit 42 from the moment when the "H" level signal is input to operate the switching IC 13. In the output of b of FIG. 5, the pulse of the period a is output. Therefore, in order to make the period a longer than the period b, which is the pulse interval of the synchronization signal,
When the values of the resistor R1 and the capacitor C1 are determined in advance, pulses are continuously output to the OR circuit 42 and the switching IC 13 is continuously operated while the synchronization signal is continuously input. The transition to the power saving mode is performed by shutting off the input of the synchronization signal, turning off the photocoupler 37, and setting the output from the power saving transition determination circuit 39 to the switching IC 13 to the “L” level.

The synchronization signal processing circuit 33 is a circuit for prohibiting the transition from the normal mode to the power saving mode.
Even when the synchronizing signal is input from the terminal, if the synchronizing signal processing circuit 33 is not powered on, the synchronizing signal processing circuit 33 outputs a signal of “L” level to the photo coupler 38, and further, the photo coupler 38. Since the signal of "L" level is output from the power saving transition determining circuit 39 to the OR circuit 42, the power saving transition determining circuit 39 uses the photocoupler 3
The operation of the switching IC 13 is controlled by the presence or absence of the signal from 7, that is, the presence or absence of the synchronization signal. Further, when power is supplied to the synchronization signal processing circuit 33 and further a synchronization signal is input from the terminal, the synchronization signal processing circuit 33 outputs an “H” level signal to the photocoupler 38, and the photocoupler 38 saves. Since the "H" level signal is output to the OR circuit 42 of the power transition determination circuit 39, the power saving transition determination circuit 39 always outputs the signal from the photocoupler 37, that is, the switching IC 13 regardless of the presence or absence of the synchronization signal. Operate. Such control prohibits the power-saving transition determination circuit 39 from shifting to the power-saving mode so as not to shut off the power source of the secondary side circuit when it is not necessary to shift to the power-saving mode, for example, when switching the synchronization signal. It can be used to

The operation will be described in more detail with reference to the timing chart of FIG. In this state, the synchronization signal is input, the output d of the photocoupler 37 outputs a signal in accordance with the synchronization signal, the output e of the power saving transition determination circuit 39 is also at the “H” level, and the switching IC 13 is operated. There is. At this time, the output of the synchronization signal processing circuit 33 is at "H" level.
Output c becomes "H" level, and power saving transition determination circuit 3
The output e of 9 is fixed to the "H" level, and the transition from the normal mode to the power saving mode is prohibited. Next, because of the transition to the power saving mode, in the state of, the input of the synchronization signal is lost and the output d of the photocoupler 37 is lost.
Since the output b of the mono-multi circuit 41 maintains the pulse output in the period a, the switching IC 13 continues to be in the operating state and the overall state does not change.

In the state of (1), the period "a" has passed and the output "b" of the mono-multi circuit 41 becomes "L" level, but the output "c" of the synchronization signal processing circuit 33 causes the power saving shift judging circuit 39 to shift to the power saving mode. Since the signal output is prohibited, the output e of the power saving transition determination circuit 39 is at "H" level,
The operation of the switching IC 13 continues. Of course, at this point, if the output of the power-saving mode shift signal from the sync signal processing circuit 33 to the power-saving shift determination circuit 39 is not prohibited, the output e of the power-saving shift determination circuit 39 becomes "L" level, and the switching IC 13 To stop. The prohibition of the output of the power saving mode transition signal is, for example, to prevent a malfunction in a no-signal state when the synchronizing signal is switched from a personal computer or the like. next. In this state, the prohibition of the power saving mode shift signal output from the synchronization signal processing circuit 33 is released, the output e of the power saving shift determination circuit 39 becomes "L" level, and the switching IC 13 is stopped. In this state, the transition to the power saving mode is completed, and the power supply to the secondary side circuit is not performed. Therefore, the synchronization signal processing circuit 33 becomes inoperable, and the "L" level signal is continuously output. You will be in a state of being In the next state, the synchronizing signal d is input again and the output b of the mono-multi circuit 41 is "H".
The level is reached, the switching IC 13 operates, and the return from the power saving mode is completed.

In this way, the transition between the normal mode and the power saving mode can be controlled according to the synchronization signal. or,
The photocoupler 3 is directly connected by the synchronization signal input from the outside.
By driving 7, the auxiliary power supply circuit is unnecessary and the configuration can be simplified. In addition, the synchronization signal processing circuit 33
By providing the above, the malfunction can be prevented by outputting the power-saving mode shift prohibition signal when the shift to the power-saving mode is unnecessary when switching the synchronization signal. In addition, a signal processing circuit 23 of another system that inputs a synchronization signal and uses the synchronization signal, a synchronization signal processing circuit 33, and a signal processing circuit of another system composed of transistors and the like and a photo coupler 37 are connected in parallel to each other. Since the coupler 37 is a high-sensitivity element that can be driven even with a low current, even if the signal processing circuit 23 and the synchronization signal processing circuit 33 that can input only a low-voltage synchronization signal, the photo coupler 37 causes the synchronization signal to drop in voltage. The operation of the signal processing circuit 23 and the synchronization signal processing circuit 33 can be sufficiently performed without causing the occurrence. Further, even if a relay as a highly sensitive element is used instead of the photocoupler 37, the same effect is produced.

Example 3. In a general electronic device such as a display monitor and a printer, a communication control signal for controlling a monitor screen, for example, enlarging / reducing or moving the screen, may be input by serial communication such as RS232C or parallel communication such as GPIB. is there. In this embodiment, the transition between the normal mode and the power saving mode is processed according to the communication control signal. FIG. 7 is a block diagram showing a power saving mode control circuit used in an electronic device such as a display monitor and a printer corresponding to a communication control signal according to an embodiment of the present invention.
Reference numeral 1 is a communication control signal processing circuit (signal processing circuit) configured by a microcomputer or the like connected in parallel to an input signal line of a communication control signal using a power source of a secondary side circuit, and communication input from a terminal The control signal is read, and the LED of the photocoupler 38 is read according to the content of the communication control signal.
The power saving mode transition signal is output to. Reference numeral 72 is a resistor that limits the current flowing through the photocoupler 38 like the resistor 24. Reference numeral 73 is a power saving transition determination circuit. Further, FIG. 8 is a configuration diagram showing a detailed configuration of the power saving transition determination circuit 73, in which 81 is an inverter and 8
Reference numeral 2 is a flip-flop circuit such as HC-74.

Next, the operation will be described. In the normal mode, that is, in the state of FIG. 9, the communication control signal is input and the output f of the photocoupler 37 is output. However, the communication control signal processing circuit 71 that reads the communication control signal at the same time , The content of the communication control signal in that state is judged to be unrelated to the transition from the normal mode to the power saving mode, the power saving mode transition signal is not output, and the output g of the photocoupler 38 is "L". Inverter 8 at the level
The output h of 1 remains at "H" level, and the flip-flop circuit 81 is not reset. That is, the output f in the state of does not affect the output i.

In the next state, since the normal mode is shifted to the power saving mode, the input communication control signal is the one indicating the shift to the power saving mode. In this case, the output f of the photocoupler 37 also outputs a pulse indicating the transition from the normal mode to the power saving mode to the flip-flop circuit 81, but the flip-flop circuit 81 has a function of reading the content of the pulse of the communication control signal. Therefore, the state of the flip-flop circuit 81 does not change. But,
At the same time, the communication control signal processing circuit 71 reading the communication control signal determines that the communication control signal in that state is a signal indicating a transition from the normal mode to the power saving mode, and the power saving mode transition signal. That is, the output g of the photocoupler 38 is set to the “H” level, the output h of the inverter 81 is set to the “L” level, and the flip-flop circuit 81 is reset. That is, transition to the state of
The switching IC 13 is stopped. Stopping the switching IC 13 completes the transition from the normal mode to the power saving mode, and stopping the switching IC 13 shuts off the power supply to the secondary side circuit, but the communication control signal processing circuit 71 turns off the power. The output g of the photocoupler 38 becomes "L" level, the output h of the inverter 81 becomes "H" level, the reset of the flip-flop circuit 81 is released, and the photocoupler 37 is released. The output f becomes the standby state.

Next, in the above state, when the communication control signal is input again, the communication control signal processing circuit 71 cannot read the communication control signal because the power supply is lost, but the photocoupler 37 is unable to read the communication control signal. A pulse is output to the output f, the flip-flop circuit 81 operates, the output i is changed from the “L” level to the “H” level, and the switching I
By operating C13 and stopping the switching IC 13, it is possible to return from the power saving mode to the normal mode.

As described above, during the transition from the normal mode to the power saving mode, the power supply of the secondary side circuit is active, the communication control signal processing circuit 71 outputs the power saving mode transition signal, and the power saving mode is set. However, when returning from the power saving mode to the normal mode, if any pulse of the communication control signal is input, it is only the return signal, so it is possible to detect the pulse and return to the normal mode. .

Therefore, the circuit of the communication control signal of the third embodiment can be applied to the circuit of the synchronizing signal of the second embodiment. That is, in the normal mode, the sync signal processing circuit detects the presence or absence of the sync signal, and outputs the power saving transition signal if there is no sync signal. Further, since the power supply of the synchronous signal processing circuit is cut off and is not functioning at the time of recovery, it is sufficient to detect re-input of the synchronous signal by the synchronous signal determination circuit and recover the normal mode.

Thus, the transition between the normal mode and the power saving mode can be controlled according to the communication control signal.
Further, by directly driving the photocoupler 37 by the communication control signal input from the outside, the auxiliary power supply circuit is not required and the configuration can be simplified. Further, since the communication control signal processing circuit 71 for inputting the communication control signal and utilizing the communication control signal and the photocoupler 37 are connected in parallel, and the photocoupler 37 is a high-sensitivity element that can be driven even at a low current, a low voltage is applied. Even with the communication control signal processing circuit 71 that can input only the communication control signal, it is possible to sufficiently perform the operation of the communication control signal processing circuit 71 without causing a voltage drop of the communication control signal by the photocoupler 37. . Further, even if a relay as a highly sensitive element is used instead of the photocoupler 37, the same effect is produced.

Example 4. In the third embodiment, the transition from the normal mode to the power saving mode is performed by the power saving mode transition signal from the communication control signal processing circuit 71, and the return from the power saving mode to the normal mode is saved. Although the power is restored in response to the detection of the pulse of the power shift determination circuit 73, the power shift determination circuit alone can shift and restore. FIG. 10 is a configuration diagram showing a power saving mode control circuit used in an electronic device such as a display monitor and a printer corresponding to a communication control signal according to one embodiment of the present invention. Is a photocoupler (second high-sensitivity element) for inputting the power-saving mode shift prohibiting signal shown in the second embodiment, 102 is a power-saving shift determination circuit, and 103 is a microcomputer built therein.

Next, the operation will be described. The microcomputer 103 always receives and decodes the communication control signal f input via the photocoupler 37, and when it receives the signal for shifting to the power saving mode in the normal mode state, the power saving mode shift operation prohibition signal. Is confirmed to be released, a signal i for stopping the switching IC 13 is output, and the transition to the power saving mode is completed. Further, even in the power saving mode state, the communication control signal f is always
When the return signal is received, the signal i for returning the switching IC 13 is output, and the return to the normal mode is completed. Thus, in this example,
Compared with the third embodiment, the communication control signal processing circuit 71 may not be provided, and the configuration can be simplified.

Example 5. Conventionally, a power-saving mode control circuit that responds to the input of a sync-on-green signal, in which a video signal and horizontal / vertical sync signals are mixed, uses a circuit that separates the video signal and the horizontal / vertical sync signal from the sync-on-green signal. It is necessary to supply power from the secondary side circuit,
Auxiliary power supply was needed. In this embodiment, a photo coupler is directly driven by a sync-on-green signal to obtain a power saving mode control circuit that does not require power supply to the secondary side circuit. FIG. 11 shows claims 1 and 7.
FIG. 3 is a configuration diagram showing a power saving mode control circuit used in an electronic device such as a display monitor corresponding to a sync-on-green signal according to an embodiment of the invention of FIG.
Reference numeral 11 is a power supply for the secondary side circuit, and is a sync-on-green signal processing circuit (signal processing circuit) for inputting a sync-on-green signal connected in parallel to the sync-on-green input signal line. Reference numeral 112 is a photocoupler (first High sensitivity element),
Reference numerals 113 and 114 are resistors, 115 is an operational amplifier (amplifier circuit), 116 is a resistor, 117 is a Zener diode (predetermined value potential limiting circuit), 118 is a mono-multi circuit such as 74HC123, 119 is an AND circuit, 120 and 122 are resistors, 121 is a capacitor, 123 is an operational amplifier, 124
Is an inverter, and the capacitor 121, the resistor 122, and the operational amplifier 123 form a low-pass filter.

Next, the operation will be described. First, since the sync-on-green signal is a signal of about 1 V as shown in FIG. 13, it is connected in parallel with a circuit such as the sync-on-green signal processing circuit 111. If this is connected in series, as shown in FIG.
Since a voltage drop of about 1.0 to 0.7 V occurs at both ends of the video control IC 1 in the normal mode.
This is because the circuits such as 11 cannot operate.

The sync-on-green signal transmitted to the primary side by the photocoupler 112 is amplified by, for example, 20 times by the operational amplifier 115. As a result, the sync signal portion has a size of about 6V. At this time, the video signal portion is saturated as shown in FIG. 14 when the operational amplifier 115 is powered by 12V, for example. Next, the signal shown in FIG. 14 is converted to a 5V Zener diode 117.
Since all the voltage of 5 V or more is cut through, the end result is that only the sync signal is separated as shown in FIG.

Here, first, in order to separate the horizontal synchronizing signal from the synchronizing signal shown in FIG. 15, a horizontal synchronizing signal component having a period t ₀ as shown in FIG. 16A is input to the mono-multi circuit 118. If so, the mono-multi circuit 118 generates a pulse having an "H" level interval of a period t determined by the resistor R2 and the capacitor C2 (FIG. 16).
(B)). The AND circuit 119 is shown in FIGS.
Input the pulse of. Here, if the period t is set to be sufficiently longer than the expected horizontal synchronizing signal t ₀ , the AND circuit 119 determines that the pulse in FIG. 16B is at the “H” level, and FIG. It is possible to generate a horizontal synchronizing signal having a "H" level interval of a pulse of "H" level, that is, a period T (H) level interval (FIG. 16C). Further, regarding the vertical synchronizing signal in the synchronizing signal of FIG. 15, for example, as in the case of the horizontal synchronizing signal in FIG.
6 (e) is generated, but since the vertical synchronizing signal is generally several times longer than the horizontal synchronizing signal, the pulse shown in FIG.
There is no period in which (e) and FIG. 16 (d) are at the “H” level at the same time, the output of the AND circuit 119 becomes FIG. 16 (f), and the vertical synchronizing signal is not generated.

Next, regarding the separation of the vertical synchronizing signal, first, when the synchronizing signal shown in FIG. 15 is passed through a low-pass filter composed of a capacitor 121, a resistor 122, and an operational amplifier 123, as shown in FIG. The sync signal has a waveform as shown in FIG. 17B because its “L” level pulse width is short, and the output of the inverter 124 is shown in FIG.
As in (c), all become "H" level and no horizontal synchronizing signal is generated. In addition, since the vertical synchronizing signal (d) has a long pulse width, when it is passed through a low-pass filter, the result shown in FIG.
When the waveform becomes as shown in (e) and the waveform is shaped by the inverter 124, a vertical synchronizing signal as shown in FIG. 17 (f) can be generated. Hereinafter, if the procedure of the determination based on the presence / absence of the sync signal and the mode transition may be the same as that of the second embodiment, the presence / absence of at least one of the horizontal / vertical sync signals is detected by the power saving determination circuit, A transition between the power saving mode and the normal mode may be performed. In the above embodiment, the horizontal / vertical sync signal is separated from the sync-on-green signal, and the separated horizontal / vertical sync signal is
Although the mode transition is controlled by the vertical synchronization signal, the power saving determination circuit may detect the presence or absence of a pulse from the output signal of the Zener diode 117 including the horizontal synchronization component and the vertical synchronization component.

In this way, the transition between the normal mode and the power saving mode can be controlled according to the sync-on-green signal. Further, since the horizontal sync signal and the vertical sync signal are separated from the sync-on-green signal, the horizontal sync signal and the vertical sync signal can be selectively used as necessary. Further, by directly driving the photocoupler 112 with a sync-on-green signal input from the outside,
The auxiliary power supply circuit is unnecessary and the configuration can be simplified. Further, since the sync-on-green signal is input and the sync-on-green signal control circuit 111 that uses the sync-on-green signal is connected in parallel to the photo-coupler 112, the photo-coupler 112 is a high-sensitivity element that can be driven even at a low current. Even in the above-mentioned sync-on-green signal control circuit 111 that can input only a low-voltage sync-on-green signal, the operation of the sync-on-green signal control circuit 111 does not cause a voltage drop of the sync-on-green signal by the photocoupler 112. Can be performed sufficiently. Further, even if a relay as a high-sensitivity element is used instead of the photocoupler 112, the same effect can be obtained.

Example 6. Conventional personal computers and workstations are not uniform with respect to control signals when shifting to the power saving mode. Therefore, the power saving mode control signal and the horizontal synchronizing signal OFF shown in the first to fifth embodiments,
When the power-saving mode is entered, determine whether the vertical sync signal is turned off, both the horizontal and vertical sync signals are turned off, and the transition control by the communication control signal has issued the transition command from the personal computer or workstation. There is a need. FIG. 18 is a configuration diagram showing a power saving mode control circuit used in an electronic device such as a display monitor and a printer for determining the contents of a port shift command according to an embodiment of the invention of claims 1, 2 and 7. ,
Reference numeral 181 is a signal processing circuit configured by a microcomputer using the power source of the secondary side circuit. If each control signal is input and at least one control signal prohibits the transition to the power saving mode, The power saving mode shift prohibiting signal is output to the photocoupler 192 (second high-sensitivity element), and the power saving mode shift prohibiting signal is stopped unless all the control signals prohibit the shift to the power saving mode. 182-18
Reference numeral 7 is a resistor for limiting current, 188 to 191 and 193 are photocouplers (first high-sensitivity element, high-sensitivity element group), 19
Reference numerals 4 to 199 are a buffer, an amplifier and a sync separation circuit for temporarily storing or amplifying the output signals of the photocouplers 188 to 193 and separating the sync signal and the video signal. Reference numeral 200 denotes a power-saving shift determination circuit configured by a microcomputer or the like for inputting the output signal, 201 denotes a reset IC for the power-saving shift determination circuit 200, which resets the power-saving shift determination circuit 200 at the same time when the AC power supply 1 is turned on. To do.

Next, the operation will be described. FIG. 19 is a flowchart showing the operation of this embodiment. First, in step ST1, the AC power supply 1 is turned on, and at the same time, the power saving transition determination circuit 200 is reset by the reset IC 201 to operate the switching IC 13,
Power is supplied to the secondary circuit (step ST2). This operation completes the normal mode. Next, after the signal processing circuit 181 has fully started up, the signal processing circuit 1
81 continues to check whether or not the power-saving mode transition prohibition signal is released for all control signals (step ST
3). The signal processing circuit 181 is programmed so that the control signal input to each of the personal computer and the workstation is in what kind of signal state the transition to the power saving mode is prohibited. This power-saving mode shift prohibiting signal prevents the power-saving shift determination circuit 200 from malfunctioning at the time of noise or signal switching during operation.

Next, when the power saving mode shift control signal is generated from the personal computer and the workstation, the signal processing circuit 181 releases the power saving mode shift prohibiting signal. The power-saving shift determination circuit 200, which has received the cancellation signal of the power-saving mode shift prohibition signal, first checks whether or not the horizontal synchronizing signal is lost (step ST4), and if it is lost, checks the vertical synchronizing signal. Here, if the vertical synchronizing signal has disappeared, the standby mode A is set, and if the vertical synchronizing signal is present, the standby mode B is set (step ST5). If there is a horizontal sync signal and no vertical sync signal, the standby mode C is set (step ST
6). Next, it is checked whether or not the power saving mode control signal has changed compared to before the cancellation of the power saving mode transition prohibition signal. If it has changed, the standby mode D is set, and if it has not changed, the standby mode E is set. (Step ST
7). In this state, an operation prohibition signal is output to the switching IC 13 to stop the power supply. This operation completes the transition to the power saving mode. Mode A === Restoration from power saving mode according to restoration of both horizontal and vertical sync signals Mode B === Restoration from power saving mode according to restoration of horizontal sync signals Mode C === Return of vertical sync signals Power saving mode is restored according to the mode D === Power saving mode is restored from the power saving mode according to the change of the control signal Mode E === The power saving mode is restored according to the wake-up signal by the communication control signal The power saving transition determination circuit 200 can monitor each control signal and prepare for the return from the power saving mode to the normal mode. Although the sync-on-green signal and the green signal are input as the control signals in FIG. 18, the sync-on-green signal and the green signal are separated into the video signal and the horizontal / vertical synchronizing signals as shown in the fifth embodiment. This makes it possible to prepare for the return to the normal mode in modes A to C in the power saving determination monitoring circuit 200.

As described above, it is possible to determine which control signal issued the shift command when shifting to the power saving mode, and the control signal can be provided with a return to the normal mode. Further, by directly driving the photocouplers 188 to 191, 193 by the respective control signals input from the outside, the auxiliary power supply circuit is unnecessary and the configuration can be simplified. Further, a signal processing circuit 181 for inputting each control signal and utilizing each control signal and a photo coupler 188 to 191, 193 are connected in parallel, and the photo coupler 188 to 191, 193 is a high drive capable of driving even a low current. Since the sensitivity element is used, even if the signal processing circuit 181 can input only low-voltage control signals, the photo-couplers 188 to 191 and 193 do not cause a voltage drop in each control signal, The operation of 181 can be sufficiently performed. Further, the photo coupler 188
Even if a relay as a high-sensitivity element is used instead of ~ 191 and 193, the same effect is obtained.

Example 7. Although the power saving mode control circuit according to the input of the sync-on-green signal has been described in the fifth embodiment, the frequency of the sync-on-green signal is about 100 kHz for the horizontal synchronizing signal, about 60 Hz for the vertical synchronizing signal, and the video signal. 30MHz-150MHz
Therefore, if a plurality of circuits use the sync-on-green signal in the normal mode, the frequency characteristics may be deteriorated. Further, the deterioration of the frequency characteristic is directly connected to the deterioration of the image quality of the screen of the display monitor. This embodiment is intended to prevent the deterioration of the frequency characteristic and improve the image quality of the screen of the display monitor by reducing the circuit using the sync-on-green signal in the normal mode.

FIG. 20 is a power-saving mode control used in an electronic device such as a display monitor and a printer according to the input of a sync-on-green signal for preventing the deterioration of the frequency characteristic according to one embodiment of the present invention. FIG. 2 is a configuration diagram showing a circuit, in which reference numeral 202 is a first signal processing circuit (signal processing circuit) using a power source of a secondary side circuit, and the first signal processing circuit 202 is a sink input from a terminal. The video signal is processed from the on-green signal and the sync signal and the video signal are separated. Reference numeral 203 denotes a second signal processing circuit (signal processing circuit) that uses the power supply of the secondary side circuit, and this second signal processing circuit 203 saves power from the synchronization signal separated by the first signal processing circuit 202. It is determined whether the mode transition prohibition state or the power saving mode transition state is determined. If the power saving mode transition is prohibited, power is supplied to the switching circuit 204 such as a relay to open the switching circuit 204, and the photo coupler (first 2 high-sensitivity element) 207, a power saving mode shift prohibition signal is output to the power saving mode shift state, and the power supply to the switching circuit (switching circuit) 204 is stopped and closed, and the photocoupler 207 Release the power save mode prohibition signal to. Reference numeral 205 is a resistor for limiting the current, 206 is a photocoupler for the sync-on-green signal (first high-sensitivity element), 207 is a photocoupler for the power saving mode prohibition release signal from the second signal processing circuit 203, 208 , 209 is a resistor, 210 is a sync-on-green signal sync separation circuit, and 211 is a power saving transition determination circuit.

Next, the operation will be described. The first signal processing circuit 202 performs video processing from the sync-on-green signal input from the terminal and always separates the sync signal and the video signal. The second signal processing circuit 203 is the first
From the synchronization signal separated by the signal processing circuit 202, the power saving mode shift prohibition state or the power saving mode shift state is determined, and if the power saving mode shift prohibition state, power is supplied to the switching circuit 204. Then, the power saving mode shift prohibiting signal is outputted to the photo coupler 207 and the power saving mode shift judging circuit 211 is put in the power saving mode shift prohibiting state. As described above, in the normal mode, since the switching circuit 204 is in the open state, the sync-on-green signal input from the terminal is supplied only to the first signal processing circuit 202, which deteriorates the frequency characteristic, that is, the display monitor. It is possible to prevent the image quality of the screen from deteriorating.

When the second signal processing circuit 203 determines from the synchronizing signal that the power saving mode has been entered, the power supply to the switching circuit 204 is stopped and closed, and the photo coupler 207 saves power. Output the mode control signal.
The power saving transition determination circuit 211 stops the switching IC 13 in response to the input of the power saving mode control signal, and cuts off the supply of power to the secondary side circuit. With these operations, the transition to the power saving mode is completed. Further, since the switching circuit 204 is closed in the power saving mode, the photocoupler 206 and the sync-on-green signal sync separation circuit 21 are closed.
0, the synchronization signal in the sync-on-green signal is monitored in the order of the power saving transition determination circuit 211, and the release of the power saving mode is waited. The switching circuit 204 has been described by taking a relay as an example. However, if the primary side power supply and the secondary side sync-on-green signal can be separated, the power saving transition determination circuit 211 is controlled more than the primary side. May be.

As described above, in the normal mode, the sync-on-green signal is supplied only to the first signal processing circuit 202, so that the deterioration of the frequency characteristic, that is, the deterioration of the image quality of the screen of the display monitor can be prevented. Further, by directly driving the photocoupler 206 with a sync-on-green signal input from the outside, the auxiliary power supply circuit is not required and the configuration can be simplified. In addition, since the first signal processing circuit 202 that inputs the sync-on-green signal and uses the sync-on-green signal is connected in parallel to the photocoupler 206, the photocoupler 206 is a high-sensitivity element that can be driven even at a low current. The first signal processing circuit 202 that can input only low-voltage sync-on-green signal
Even in this case, the operation of the first signal processing circuit 202 can be sufficiently performed without causing the voltage drop of the sync-on-green signal by the photocoupler 206. Further, even if a relay as a high-sensitivity element is used instead of the photocoupler 206, the same effect can be obtained.

It is needless to say that the power saving mode control circuits in the above-mentioned first to seventh embodiments can be applied to a display element using liquid crystal, plasma, etc. in addition to the display monitor using the CRT.

[0066]

As described above, according to the first aspect of the invention, the primary side circuit is connected in parallel with the signal processing circuit for processing the signal in response to the control signal, and is driven in response to the control signal. Since the first high-sensitivity element for stopping the power supply drive circuit provided in is provided, the configuration can be simplified without using the auxiliary power supply circuit. Further, there is an effect that the control signal supplied to the signal processing circuit does not cause a voltage drop, and the operation of the signal processing circuit can be sufficiently performed.

According to the second aspect of the present invention, the signal processing circuit outputs the power-saving mode shift prohibition signal to the power-saving shift determination circuit via the second sensitive element in response to the control signal to enter the power-saving mode. In addition to the effect of the invention of claim 1, it is possible to prevent the transition when the transition to the power saving mode is unnecessary at the time of signal switching and prevent the malfunction. There is.

According to the third aspect of the present invention, the first high-sensitivity element connected in parallel with the synchronizing signal processing circuit and the power saving mode shift prohibiting signal output from the synchronizing signal processing circuit are canceled and Since the power-supply drive circuit is stopped when the sync signal from the first high-sensitivity element is stopped, and the power-supply shift determination circuit that restores the power-supply drive circuit according to the return of the sync signal is provided, It is possible to shift to the power saving mode and return to the normal mode in response to the stop and return of the signal. Further, the structure can be simplified without using the auxiliary power supply circuit. Further, there is an effect that the synchronizing signal supplied to the synchronizing signal signal processing circuit does not cause a voltage drop, and the operation of the synchronizing signal signal processing circuit can be sufficiently performed. Furthermore, by prohibiting the transition to the power saving mode with the power saving mode transition prohibition signal,
Prevents malfunctions when it is not necessary to switch to the power saving mode when switching signals.

According to the fourth aspect of the invention, the power source is supplied in response to the first high-sensitivity element connected in parallel with the communication control signal processing circuit and the power saving mode transition signal output from the communication control signal processing circuit. Since it is configured to include a power saving transition determination circuit that stops the drive circuit and restores the operation of the power supply drive circuit in response to the communication control signal from the first high-sensitivity element, it is possible to stop and restore the communication control signal. Then, it is possible to shift to the power saving mode and return to the normal mode. Further, the structure can be simplified without using the auxiliary power supply circuit. Further, there is an effect that the communication control signal supplied to the communication control signal processing circuit does not cause a voltage drop, and the operation of the communication control signal processing circuit can be sufficiently performed.

According to the invention of claim 5, when the first high-sensitivity element connected in parallel with the communication control signal processing circuit and the power saving mode transition prohibition signal from the communication control signal processing circuit are released. In addition, since it is configured to include a power saving transition determination circuit that stops the power supply drive circuit and restores the operation of the power supply drive circuit in response to the communication control signal from the first high sensitivity element, It is possible to shift to the power saving mode and return to the normal mode in response to stop and return. Further, the structure can be simplified without using the auxiliary power supply circuit. Further, there is an effect that the communication control signal supplied to the communication control signal processing circuit does not cause a voltage drop, and the operation of the communication control signal processing circuit can be sufficiently performed. Further, as compared with the invention of claim 5, the function of outputting the power saving mode transition signal by the communication control signal processing circuit can be eliminated and the configuration can be simplified. In addition, the power saving mode shift prohibition signal is output to the power saving shift judging circuit to prohibit shifting to the power saving mode, thereby preventing malfunction when switching to the power saving mode is unnecessary when switching signals. .

According to the sixth aspect of the present invention, the first high-sensitivity element connected in parallel with the sync-on-green signal processing circuit and the sync-on-green signal output from the first high-sensitivity element are amplified. Limit the potential above a specified value to
Since it is configured to include a power saving transition determination circuit that separates a signal including a vertical synchronization component and stops and restores operation of the power supply drive circuit according to stop and input of the signal including the horizontal / vertical synchronization component, It is possible to shift to the power-saving mode and return to the normal mode in response to the stop and return of the sync-on-green signal. Further, the structure can be simplified without using the auxiliary power supply circuit. Further, there is an effect that the sync-on-green signal processing circuit does not drop in voltage and the operation of the sync-on-green signal processing circuit can be sufficiently performed.

According to the invention of claim 7, the high-sensitivity element group connected in parallel with the signal processing circuit and the power-saving mode shift prohibiting signal outputted from the signal processing circuit are released, and the high-sensitivity element is provided. The power supply drive circuit is stopped when at least one control signal of at least two control signals from the group is stopped, the stopped control signal is detected, and the power supply drive circuit is detected in response to the restoration of the stopped control signal. Since it is configured to include the power saving transition determination circuit that restores the operation, it is possible to shift to the normal mode according to the restoration of the synchronization signal, the communication control signal, and the power saving mode control signal when shifting to the power saving mode. It is possible to adapt to the type of control signal. Further, the structure can be simplified without using the auxiliary power supply circuit. Further, there is an effect that the control signal supplied to the signal processing circuit does not cause a voltage drop, and the operation of the signal processing circuit can be sufficiently performed. Furthermore, the power saving mode shift prohibition signal is output to the power saving shift determination circuit to prohibit shifting to the power saving mode, thereby preventing malfunction when switching to the power saving mode is unnecessary, such as signal switching. be able to.

According to the invention of claim 8, it is opened when the signal processing circuit outputs the power-saving mode shift prohibition signal,
An opening / closing circuit that closes when outputting a power saving mode transition signal, a first high-sensitivity element connected in series with the opening / closing circuit and in parallel with the signal processing circuit, and the signal processing circuit A power saving transition determination circuit that stops the power supply driving circuit in response to the power saving mode transition signal output from the device and restores the operation of the power driving circuit in response to the synchronization signal from the sync-on-green signal sync separation circuit With this configuration, it is possible to reduce the number of circuits that use the sync-on-green signal in the normal mode, prevent the deterioration of the frequency characteristics, and prevent the disturbance of the image. Further, the structure can be simplified without using the auxiliary power supply circuit. Further, there is an effect that the sync-on-green signal supplied to the signal processing circuit does not cause a voltage drop, and the operation of the signal processing circuit can be sufficiently performed. Furthermore, the power saving mode shift prohibition signal is output to the power saving shift determination circuit to prohibit shifting to the power saving mode, thereby preventing malfunction when switching to the power saving mode is unnecessary, such as signal switching. be able to.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a power saving mode control circuit corresponding to a power saving mode control signal according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing a power saving mode control circuit using a transistor according to an embodiment of the invention of claim 1;

FIG. 3 is a configuration diagram showing a power saving mode control circuit corresponding to a synchronization signal according to an embodiment of the present invention.

FIG. 4 is a configuration diagram showing details of a power saving shift determination circuit in FIG.

5 is a timing chart showing signals of the main configuration in FIG.

FIG. 6 is a timing chart showing signals of the main configuration in FIG.

FIG. 7 is a configuration diagram showing a power saving mode control circuit corresponding to a communication control signal according to an embodiment of the present invention.

8 is a configuration diagram showing details of a power saving transition determination circuit in FIG.

9 is a timing chart showing signals of the main configuration in FIG.

FIG. 10 is a configuration diagram showing a power saving mode control circuit corresponding to a communication control signal according to an embodiment of the present invention.

FIG. 11 is a configuration diagram showing a power saving mode control circuit corresponding to a sync-on-green signal according to an embodiment of the inventions of claims 1 and 6;

FIG. 12 is a configuration diagram when a photo coupler and a signal processing circuit are connected in series.

FIG. 13 is a timing chart showing signals of the main configuration in FIG.

14 is a timing chart showing signals of the main configuration in FIG.

15 is a timing chart showing signals of the main configuration in FIG.

16 is a timing chart showing signals of the main configuration in FIG.

FIG. 17 is a timing chart showing signals of a main part configuration in FIG. 11.

FIG. 18 is a configuration diagram showing a power saving mode control circuit corresponding to various control signals according to an embodiment of the present invention.

FIG. 19 is a flowchart showing the operation of the power saving mode control circuit corresponding to various control signals.

FIG. 20 is a configuration diagram showing a power saving mode control circuit for preventing deterioration of frequency characteristics of a sync-on-green signal according to an embodiment of the present invention.

FIG. 21 is a configuration diagram showing a conventional power saving mode control circuit.

FIG. 22 is a configuration diagram showing a power saving mode control circuit when a conventional photocoupler is used.

[Explanation of symbols]

12 output transformer (power supply circuit) 13 switching IC (power supply drive circuit) 14 rectifying diode (power supply circuit) 15 smoothing capacitor (power supply circuit) 23 power saving mode signal processing circuit (signal processing circuit) 25 photocoupler (first High-sensitivity element, element) 33 Synchronous signal processing circuit (signal processing circuit) 37, 112, 206 Photocoupler (first high-sensitivity element) 38, 101, 207 Photocoupler (second high-sensitivity element) 39, 73 , 102, 200, 211 Power saving transition determination circuit 71 Communication control signal processing circuit (signal processing circuit) 111 Sync-on-green signal processing circuit (signal processing circuit) 115 Operational amplifier (amplification circuit) 117 Zener diode (predetermined value potential limiting circuit) 181 Signal processing circuit 188-191,193 Photo coupler (first high-sensitivity element, High-sensitivity element group) 202 First signal processing circuit (signal processing circuit) 203 Second signal processing circuit (signal processing circuit) 204 Switching circuit (switching circuit) 210 Sync-on-green signal sync separation circuit

Claims (8)

[Claims] 1. A power supply circuit that supplies power from a primary side circuit to a secondary side circuit, a power supply drive circuit that is provided in the primary side circuit and drives the power supply circuit, and a power supply circuit that is provided in the secondary side circuit. Power is supplied from the power supply circuit, and a signal processing circuit that performs signal processing according to a control signal input from an external circuit,
First connected to the signal processing circuit in parallel and driven according to a control signal input from the external circuit and stopping the power supply driving circuit provided in the primary side circuit
Power saving mode control circuit including the high sensitivity element of. 2. A power supply circuit for supplying power from the primary side circuit to the secondary side circuit, a power supply drive circuit provided in the primary side circuit for driving the power supply circuit, and a power supply circuit provided in the secondary side circuit. Power is supplied from the power supply circuit, and a signal processing circuit that outputs a power saving mode transition prohibition signal in response to a control signal input from an external circuit, and a signal processing circuit that is connected in parallel with the signal processing circuit and is input from the external circuit A first high-sensitivity element that is driven according to a control signal and outputs the control signal to the primary side circuit, and a primary side circuit that is driven according to the power saving mode shift prohibition signal output from the signal processing circuit. The second high-sensitivity element that outputs the power-saving mode shift prohibiting signal and the primary side circuit are provided. When the power-saving mode shift prohibiting signal from the second high-sensitivity element is released, 1 high-sensitivity element A power saving mode control circuit including a power saving transition determination circuit that stops the power supply drive circuit according to a control signal from the device. 3. A power supply circuit for supplying power from the primary side circuit to the secondary side circuit, a power supply drive circuit provided in the primary side circuit for driving the power supply circuit, and a power supply circuit provided in the secondary side circuit. The power is supplied from the power supply circuit and the synchronization signal processing circuit that outputs the power saving mode transition prohibition signal in response to the synchronization signal input from the external circuit, and the synchronization signal processing circuit connected in parallel with the synchronization signal processing circuit and input from the outside The first high-sensitivity element that is driven according to the synchronized signal that is output and that outputs the synchronized signal to the primary side circuit, and the primary that is driven according to the power saving mode transition prohibition signal output from the synchronized signal processing circuit A second high-sensitivity element that outputs the power-saving mode transition prohibition signal to the side circuit, and a primary-side circuit that is provided to release the power-saving mode transition prohibition signal from the second high-sensitivity element and 1 high sensitivity element A power-saving mode control circuit including a power-saving transition determination circuit that stops the power supply driving circuit when the synchronization signal from the child is stopped and restores the power supply driving circuit according to the restoration of the synchronization signal. 4. A power supply circuit for supplying power from the primary side circuit to the secondary side circuit, a power supply drive circuit provided in the primary side circuit and driving the power supply circuit, and a power supply circuit provided in the secondary side circuit. A power supply is supplied from a power supply circuit, and a communication control signal processing circuit that outputs a power saving mode transition signal according to a communication control signal input from an external circuit, and the communication control signal processing circuit is connected in parallel with the communication control signal processing circuit, and the external circuit In response to the communication control signal input from the first high-sensitivity element that outputs the communication control signal to the primary side circuit and the power saving mode transition signal output from the communication control signal processing circuit A second high-sensitivity element that is driven and outputs the power-saving mode shift signal to the primary side circuit; and the second high-sensitivity element that is provided in the primary side circuit and that responds to the power-saving mode shift signal from the second high-sensitivity element. Power drive circuit A power-saving mode control circuit including a power-saving transition determination circuit that stops the operation and restores the operation of the power supply driving circuit according to a communication control signal from the first high-sensitivity element. 5. A power supply circuit for supplying power from the primary side circuit to the secondary side circuit, a power supply drive circuit provided in the primary side circuit for driving the power supply circuit, and a power supply circuit provided in the secondary side circuit. The power is supplied from the power supply circuit, and the communication control signal processing circuit that outputs the power saving mode transition prohibition signal according to the communication control signal input from the external circuit, and the communication control signal processing circuit that is connected in parallel with the communication control signal processing circuit A first high-sensitivity element that is driven according to a communication control signal input from the circuit and outputs the communication control signal to the primary side circuit, and a power saving mode transition prohibition signal output from the communication control signal processing circuit. And a second high-sensitivity element that is driven in response to outputting the power-saving mode transition prohibition signal to the primary-side circuit, and a power-saving mode transition prohibition signal from the second high-sensitivity element that is provided in the primary-side circuit. Is released Power-saving mode determination circuit that stops the power-supply drive circuit and restores the operation of the power-supply drive circuit in response to a communication control signal from the first high-sensitivity element circuit. 6. A power supply circuit for supplying power from the primary side circuit to the secondary side circuit, a power supply drive circuit provided in the primary side circuit for driving the power supply circuit, and provided in the secondary side circuit and A sync-on-green signal processing circuit that supplies power from the power supply circuit and that processes signals according to the sync-on-green signal input from an external circuit, and is connected in parallel with the sync-on-green signal processing circuit and is input from the outside. And a first high-sensitivity element that is driven according to the sync-on-green signal and outputs the sync-on-green signal to the primary side circuit, and an amplifier that amplifies the sync-on-green signal output from the first high-sensitivity element Circuit and horizontal / vertical sync components in the sync-on-green signal by limiting the potential of the sync-on-green signal amplified by the amplifier circuit above a predetermined value. Which is provided in the primary side circuit for outputting a signal including a signal including the above, and which stops the power supply drive circuit in response to the stop and input of the signal including the horizontal / vertical synchronization components from the above predetermined value potential limiting circuit. And a power-saving mode control circuit including a power-saving shift determination circuit that restores operation. 7. A power supply circuit for supplying power from the primary side circuit to the secondary side circuit, a power supply drive circuit provided in the primary side circuit for driving the power supply circuit, and a power source drive circuit provided in the secondary side circuit. Power is supplied from the power supply circuit, and at least two control signals of the synchronization signal, the communication control signal, and the power saving mode control signal are input from the external circuit, and at least two of them are input.
A signal processing circuit that outputs a power saving mode transition prohibition signal according to one control signal, and a primary processing circuit that is connected in parallel with the signal processing circuit and is driven according to at least two control signals input from the external circuit. The high-sensitivity element group that outputs those control signals to the side circuit and the power-saving mode transition prohibition signal that is driven according to the power-saving mode transition prohibition signal output from the signal processing circuit are output to the primary side circuit. The second high-sensitivity element and the second circuit provided on the primary side circuit,
The power-saving mode transition prohibition signal output from the high-sensitivity element is released, and at least 2 from the high-sensitivity element group is released.
The power supply driving circuit is stopped when at least one control signal of the two control signals is stopped, and the stopped control signal is detected and the operation of the power supply driving circuit is restored according to the restoration of the stopped control signal. A power-saving mode control circuit including a power-saving shift determination circuit for controlling the power-saving mode. 8. A power supply circuit for supplying power from the primary side circuit to the secondary side circuit, a power supply drive circuit provided in the primary side circuit and driving the power supply circuit, and a power supply circuit provided in the secondary side circuit. Power is supplied from the power supply circuit, and the sync signal is separated from the sync-on-green signal input from the external circuit.
A signal processing circuit that outputs a power saving mode shift prohibition signal or a power saving mode shift signal according to the synchronization signal and the signal processing circuit that is connected in series to the input signal line of the sync on green signal An open / close circuit that opens when a signal is output, and closes when a power saving mode transition signal is output, and is connected in series with the switch circuit and in parallel with the signal processing circuit. A first high-sensitivity element that is driven according to the sync-on-green signal input from the circuit and outputs the sync-on-green signal to the primary side circuit; A second high-sensitivity element that is driven according to the power saving mode shift signal and outputs the power saving mode shift prohibition signal or the power saving mode shift signal to the primary side circuit; Provided on the side circuit, a sync-on-green signal sync separator for separating a sync signal from the sync-on-green signal outputted from the first high-sensitive elements,
When the power saving mode transition prohibition signal is input from the second high-sensitivity element provided in the primary side circuit, the operation of the power supply drive circuit is continued, and when the power saving mode transition signal is input, the power supply drive circuit is activated. A power-saving mode control circuit comprising: a power-saving transition determination circuit that stops the operation and restores the operation of the power supply drive circuit in response to a sync signal from the sync-on-green signal sync separation circuit.