JPH0323039B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a phase control device that transmits control data and the like in a two-wire system.

BACKGROUND ART FIG. 1 is an electrical circuit diagram of a conventional phase control device that transmits control data and the like. Main body processing section A1
is composed of a power source E1, photocouplers 4, 5, and 6, and resistors 7, 8, and 9. The operating section B1 has switches 1, 2, and 3, one end of the switch 1 is connected to one end of the resistor 7 via a line l1, one end of the switch 2 is connected to one end of the resistor 8 via a line l2, One end of switch 3 is connected to one end of resistor 9 via line l3. switch 1, 2, 3
The other ends of each are grounded via line l4. When the switch 1 is turned on, the current from the power source E1 flows through the photocoupler 4 and the resistor 7 to the line l.
1 in the direction of arrow F1 and flows to ground via line l4. This causes the photocoupler 4 to operate and send out a signal from the output Q1. When the switch 2 is turned on, the current from the power source E1 flows through the photocoupler 5 and the resistor 8 through the line 12 in the direction of the arrow F2, and through the line 14 to ground, and the photocoupler 5 is activated. When switch 3 is turned on,
The current from the power source E1 flows through the photocoupler 6 and the resistor 9 through the line 13 in the direction of the arrow F3, and through the line 14 to ground, and the photocoupler 6 is activated. As described above, when switch 1 is turned on, a signal is sent from the output Q1 of photocoupler 4, when switch 2 is turned on, a signal is sent from output Q2 of photocoupler 5, and when switch 3 is turned on, a signal is sent from output Q3 of photocoupler 6. be done. Electrical equipment and the like are controlled by such signals.

As described above, in the circuit shown in FIG. 1, the number of transmission lines for transmitting signals requires a large number of switches and a number of common lines, which makes wiring complicated and increases costs.

Purpose The purpose of the present invention is to solve the above-mentioned technical problem,
The purpose of the present invention is to provide a phase control device that uses two-wire wiring as a transmission line for transmitting signals and realizes a low cost.

The present invention includes: an AC power source 64; a lighting load 63; and a control terminal connected in series to the AC power source 64 and the lighting load 63, and conduction or interruption is controlled by an input signal to the control terminal. a semiconductor switching element 62 that can be controlled; a first line l51, l53 connected to one end of the semiconductor switching element 62; a second line l52 connected to the other end of the semiconductor switching element 62; a first photocoupler 57 having a first light emitting diode 57a connected in series to one line l51, l53; connected in the opposite direction to the first light emitting diode 57a and in parallel with the first light emitting diode 57a; a second photocoupler 56 having a second light emitting diode 56a; and a second photocoupler 56 that responds to the outputs of the first and second photocouplers 57 and 56 in a range from the zero-crossing point of the power supply voltage waveform from the AC power supply 64 to a predetermined phase angle. Then, the direction of the current flowing through the first lines l51 and l53 is determined, and in the range from the predetermined phase angle of the power supply voltage waveform to the next zero cross point,
means 60, 61 for controlling the phase of the semiconductor switching element 62 according to the determined direction of the current;
65, and a first switch 51 and a first light emitting diode 57a provided in the same direction as the first switch 51 and the first light emitting diode 57a.
a first series circuit having a diode 53, a second switch 52, and the second light emitting diode 56;
This is a phase control device characterized in that a second series circuit having a second diode 54 provided in the same direction as a is connected between the first and second lines l51, l53; l52.

Embodiment FIG. 2 is an electric circuit diagram for explaining the principle of the present invention. In the main body processing section A2, terminal a
1 is connected to the power supply Vcc via a resistor 11, and is also connected to the collector of a phototransistor 12a of a photocoupler 12. The terminal a2 is connected to the power supply Vcc via the resistor 10, and is also connected to the collector of the phototransistor 13a of the photocoupler 13. The cathode of the light emitting diode 12b of the photocoupler 12 is connected to one end of the AC power source E2 via the line l7, and the anode of the light emitting diode 12b is connected to the line l5 via the resistor 14. The anode of the light emitting diode 13b of the photocoupler 13 is connected to one end of the AC power supply E2 via the line l7, and the cathode of the light emitting diode 13b is connected to the resistor 14.
is connected to line l5 via. AC power supply E2
The other end is connected to line l6 via line l8 and resistor 15.

The operating section B2 has diodes 16, 17 and switches 18, 19, 20. diode 1
The anode of switch 6 is connected to line l5, and its cathode is connected to one end of switch 18. The other end of switch 18 is connected to line l6. The cathode of diode 17 is connected to line l5,
Its anode is connected to one end of switch 19. The other end of switch 19 is connected to line l6. Both ends of switch 20 are connected to line l5 and line l6.

The operation will be explained below with reference to FIG. FIG. 3 1 shows the output waveform of the AC power source E2. When switch 18 is turned on, the output shown in FIG. 3 is rectified by diode 16, and the signal shown in FIG. 3 flows through line 15 and line 16. The photocoupler 13 is activated by this signal and sends out a signal as shown in FIG. 3 from the terminal a2. At this time, the signal at the terminal a1 is at a high level as shown in FIG. 36.

When switch 19 is turned on, the signal is rectified by diode 17, and the signal shown in FIG. 3 flows through line 15 and line 16. The photocoupler 12 operates in response to this signal and sends out a signal as shown in FIG. 38 from the terminal a1. At this time, terminal a2
The signal is at high level as shown in FIG. 37.

When switch 20 is turned on, or when switches 18 and 19 are turned on at the same time, signals as shown in FIG. 3 flow through lines 15 and 16. This signal causes the photocoupler 12 and the photocoupler 13 to operate, and a signal as shown in FIG. 3 is sent out from the terminal a2, and a signal as shown in FIG. 3 is sent out from the terminal a1.

In this way, three modes can be distinguished based on the difference in the specifications of the signals sent from the terminals a1 and a2. That is, it can be determined which of the switches 18, 19, and 20 is being operated, or whether the switch 18 is on, the switch 19 is on, or the switches 18 and 19 are on simultaneously. Note that the operating section B2 shown in FIG. 2 can be replaced with the operating section b2 shown on the left. Operation part b2
are the diodes 21, 22 and the switch 23,
It has 24. The switch 23 corresponds to the switch 18 of the operating section B2, and the switch 24 corresponds to the switch 19 of the operating section B2, and their operations are the same.

FIG. 4 is an electrical circuit diagram forming another basis of the present invention. In FIG. 4, components corresponding to those shown in FIG. 2 are given the same reference numerals. In the main body processing section A3, the terminal a1 is connected to the power supply Vcc via the resistor 31, and is also connected to the output terminal of the voltage comparator 32. Terminal a2 is connected to power supply Vcc via resistor 30, and also to the output terminal of voltage comparator 33. One input terminal of the voltage comparator 32 is connected to the output terminal of the differential amplifier 34, and the other input terminal of the voltage comparator 32 is given a positive reference potential. One input terminal of the voltage comparator 33 is connected to the output terminal of the differential amplifier 35, and the other input terminal of the voltage comparator 33 is given a negative reference potential. Both input terminals of the differential amplifier 34 are connected to the resistor 3.
6, and both input terminals of the differential amplifier 35 are connected to a resistor 37. The anode of diode 38 is connected to one end of resistor 36 and to line l7;
The cathode of diode 38 is connected to the other end of resistor 36 and the cathode of diode 39. The cathode of diode 39 is connected to one end of resistor 37, and the anode of diode 39 is connected to the other end of resistor 37 and line l5.

Both ends of the AC power supply E2 are line l7 and line l.
8. The line l8 is connected to the switch 1 of the operating section B2 via the resistor 40 and the line l6.
8, 19, and 20. The other end of switch 18 is connected to the cathode of diode 16, and the other end of switch 19 is connected to the anode of diode 17. anode of diode 16,
The cathode of diode 17 and the other end of switch 20 are connected to line 15.

The operation will be described below with reference to the waveform diagram of FIG. 3. When switch 18 is turned on, line l5
A signal shown in FIG. 32 flows through. This signal is
The current flows through the resistor 37 in the direction indicated by arrow F5, but does not flow through the diode 39. This generates a voltage across the resistor 37, which is amplified by the differential amplifier 35. The voltage comparator 33 removes noise from the output of the differential amplifier 35 and sends out a signal as shown in FIG. 3. When switch 19 is turned on, a signal shown in FIG. 3 flows through line 15. This signal flows through the resistor 37 in the direction indicated by arrow F4 and does not flow through the diode 38. This generates a voltage across resistor 36, which voltage is amplified by differential amplifier 34. The voltage comparator cuts noise from the output of the differential amplifier 34 and sends out a signal as shown in FIG. 38. switch 2
0 or when turning on switches 18 and 19 at the same time, line l
5, a signal as shown in FIG. 3 flows. This signal causes voltages to be generated alternately in the resistor 37 and the resistor 36. Therefore, the voltage comparator 33 sends out the signal shown in FIG.
2 outputs the signal shown in FIG. 3, 10.

FIG. 5 is an electrical circuit diagram of one embodiment of the present invention. One end of the AC power supply 64 is connected to the line l52 via the lighting load 63, and the other end is connected to the light emitting diode 57 of the first photocoupler 57 via a resistor 70.
a and the cathode of the light emitting diode 56a of the second photocoupler 56. The anode of the light emitting diode 56a and the cathode of the light emitting diode 57a are connected to one ends of the switch 51 and the switch 52 of the operating section B5 via a line 151. Line l52 is diode 5
3 and the anode of diode 54. The other end of the switch 51 is the diode 5
The other end of the switch 52 is connected to the cathode of a diode 54. The second anode of the triax (abbreviation for bidirectional thyristor) 62, which is a semiconductor switching element, is connected to the line l5.
2, the first anodes are respectively connected to the line l53. The gate of the triax 62 is the phase control section 6.
Connected to 5. The phase control section 65 is connected to the line l55.
It is connected to the output terminal Y3 of the processing device 61 via. The output terminal Y1 of the processing device 61 is the photocoupler 5
The output terminal Y2 is connected to the collector of the phototransistor 57b of the photocoupler 57. The input terminal Y4 of the processing device 61 is connected to the phototransistor 56b.
and the emitter of the phototransistor 57b, and is also grounded via a resistor 60.

The operation will be described below with reference to the waveform diagram in FIG. When the switch 51 of the operation part B5 is turned on, the current from the AC power supply 64 flows to the line l51 as indicated by the arrow F5.
It flows in the direction shown by 1. This turns on the photocoupler 57 of the main body processing section A5. Here, for example, it is assumed that the lighting load 63 is phase-controlled to a fully lit state. The current waveform flowing through line l51 is a sawtooth waveform that is the same as the voltage waveform across the first and second anodes of the triax 62 when the ignition phase angle is approximately 30 degrees and the full lighting is shown in FIG. becomes. In response to this current waveform, the photocoupler 57
is turned on only during the rest period of the triac 62, as shown in FIG. A similar operation is performed regarding the photocoupler 56.

From the output terminals Y1 and Y2 of the processing device 61, the sixth
As shown in FIGS. 3 and 6, pulses P3 and P4 are sent out at different times. For example, output terminal Y
When pulse P3 is sent from input terminal Y4
If the signals are generated at the same timing, the processing device 61 determines that the phototransistor 56b is on. Further, when the processing device 61 sends out the pulse P3 from the output terminal Y1, if no signal is generated at the input terminal Y4 at the same timing, the processing device 61 determines that the phototransistor 56b is turned off.

On the other hand, if a signal is generated at the input terminal Y4 at the same timing when the pulse P4 is sent from the output terminal Y2 of the processing device 61, the phototransistor 57b
The processing device 61 determines that the is on. Furthermore, when the processing device 61 sends out the pulse P4 from the output terminal Y2, if no signal is generated at the input terminal Y4 at the same timing, the processing device 61 sends out the phototransistor 5.
It is determined that 7b is off.

Note that, as described above, in order to send out the pulses P3 and P4 in synchronization with the voltage waveform of the AC power source 64, a power source synchronization signal is input to the input terminal Y of the processing device 61. That is, a series circuit of a resistor 71 and a light emitting diode 73 of a photocoupler 72 is connected to both ends of the AC power supply 64, and the photocoupler 72
The output of the phototransistor 74 is input to the input terminal Y of the processing device 61.

In this way, the processing device 61
In the range from the zero crossing point of the voltage waveform in step 4 to a predetermined phase angle of approximately 30 degrees, the line
51 is detected. Processing device 6
1 controls the phase of the triax 62 via the phase control section 65 according to this direction. This control is
This occurs within the range from approximately 30 degrees of phase angle to the next zero crossing point. For example, the phase at which triac 62 is fired may be increased or decreased by a fixed angle depending on the sensed direction of the current. At this time, the lighting load 63 can be made to gradually become brighter depending on the time when the switch 51 is pressed and turned on, and it can be made to become darker depending on the time when the switch 52 is pressed and turned on. Furthermore, since it is also possible to detect a state in which both switches 51 and 52 are turned on, it is of course possible to control the lighting load 63 to completely turn on or turn it off in this case. be.

FIG. 7 is an electric circuit diagram for explaining the operation of the processing device 61 in FIG. 5, where switch SWA corresponds to phototransistor 56b in FIG. 5, and switch SWB corresponds to phototransistor 57b in FIG. This corresponds to the above, and the operation has been explained above, so a description thereof will be omitted.

As described above, the pulses P3 and P4 sent out from the processing device 61 are synchronized with the power supply current flowing through the line 151, and the timing at which they occur is limited to within 30 degrees of the phase angle of the power supply voltage waveform. Further, the ignition phase angle of the triax 62 is limited to within 30 degrees of the phase angle of the power supply voltage waveform even when the lighting load 63 is fully lit. This means that if the phase angle is within 30 degrees, 95% of the lighting load power can be secured compared to when the lighting is started from a phase angle of 0 degrees, and there is no practical problem. In addition, the phase angle around 0 degrees to 30 degrees is very stable with little noise, and there are fewer problems such as erroneous turning on of the photocoupler.

Since the voltage between the lines l51, l53; l52 becomes small when the triac 62 is conductive, the current flowing through the lines l51, l53; l52 becomes small even if the switches 51, 52 are on. Therefore lines l51, l53; l52
Compared to when connected directly to the AC power supply 64,
Power consumption as a phase control device can be reduced.

Effects As described above, according to the present invention, a pair of lines l
51, l53; via l52, switch 51,5
Since the semiconductor switching element 62 can be controlled by two on/off controls, the transmission line for transmitting the signal can be a two-wire wiring, and the cost can be reduced. This is particularly advantageous when the lighting load 63 is installed on the ceiling of a large room, and the switches 51 and 52 for controlling the phase of the lighting load 63 are installed at a location where they can be easily operated.

Furthermore, even when the switches 51 and 52 are in the on state, when the semiconductor switching element 62 is conductive, the power consumed for control can be reduced.

Furthermore, since three types of control signals can be transmitted using the two switches 51 and 52 and the pair of lines l51 and l53, the semiconductor switching element 62 can be controlled from a remote position in three types of control states, for example, when the lighting load 63 can be turned on gradually, turned off gradually, and controlled on and off.

Furthermore, the direction of the current flowing through the first lines 51, 153 for phase control can be detected near the zero-cross point of the power supply voltage. Even if many loads are connected to the AC power supply 64, there is little noise due to inrush current or the like near the zero-crossing point, so the risk of malfunction can be reduced.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of a conventional phase control device, FIGS. 2 and 4 are electric circuit diagrams that are the basis of the present invention, and FIG. 3 is an electric circuit diagram for explaining the operation of FIGS. 2 and 4. 5 is an electric circuit diagram of an embodiment of the present invention, FIG. 6 is a waveform diagram for explaining the operation of the circuit in FIG. 5, and FIG. 7 is a diagram of the processing device 61 in FIG. 5.
FIG. 2 is a waveform diagram for explaining the operation of FIG. l51, l52...Line, B5...Operation unit, 5
6, 57... Photocoupler, 61... Processing device, 62...
Triack, 63...Load, 64...AC power supply, 6
5...Phase control section.

Claims (1)

[Scope of Claims] 1. AC power source 64; lighting load 63; connected in series to the AC power source 64 and the lighting load 63, having a control terminal, and conducting or breaking the connection by inputting a signal to the control terminal. a semiconductor switching element 62 that can be controlled by a semiconductor switching element 62; first lines l51 and l53 connected to one end of the semiconductor switching element 62; and a second line l52 connected to the other end of the semiconductor switching element 62. , a first photocoupler 57 having a first light emitting diode 57a connected in series to the first lines l51 and l53; a second photocoupler 56 having a second light emitting diode 56a connected thereto; and the outputs of the first and second photocouplers 57, 56 in the range from the zero-crossing point of the power supply voltage waveform from the AC power supply 64 to a predetermined phase angle. In response to this, the direction of the current flowing through the first lines l51 and l53 is determined, and within the range from the predetermined phase angle of the power supply voltage waveform to the next zero cross point,
means 60, 61 for controlling the phase of the semiconductor switching element 62 according to the determined direction of the current;
65, and a first switch 51 and a first light emitting diode 57a provided in the same direction as the first switch 51 and the first light emitting diode 57a.
a first series circuit having a diode 53, a second switch 52, and the second light emitting diode 56;
A second series circuit having a second diode 54 provided in the same direction as a is connected between the first and second lines l51, l53; l52.