JPH0120715Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an electronic timer using an electronic circuit such as a microcomputer.

[Background technology]

Conventionally, as shown in Figure 6a, this type of timer uses a backup power supply to retain the memory contents and continue the clock function even during a power outage. The set time is maintained and processing based on it is performed, and the sixth
As shown in FIG. b, there were some cases in which the off-operation process was performed when the off-operation time reached during a power outage. By the way, in a device using a latching relay in the external output section, the set state of the latching relay is maintained as shown in FIG. 6c even if a power outage occurs. Even if the latching relay is turned off during a power outage as described above, the latching relay's driving capacitor is not charged by the commercial power supply, so the latching relay is not reset and remains in the set state. be done. Therefore, when the power outage returns, the load is energized as shown in Figure 6d until the latching relay driving capacitor is charged and can drive the latching relay, and the load is not operated at an undesired time. There was a problem.

[Purpose of invention]

The present invention has been devised in view of the above-mentioned problems, and its purpose is to provide an electronic timer that prevents the load from malfunctioning upon recovery from a power outage.

[Disclosure of invention]

The present invention is characterized by the following.

The present invention will be explained below with reference to Examples.

Example Figure 1 is a circuit diagram of this example of a 24-hour type.
In this embodiment, as shown in FIG.
A memory 1b for storing time (seconds), and captures key inputs for timer settings, current time settings, output switching, etc., and generates display data for displaying the current time, timer information, etc. on, for example, the liquid crystal display unit 2. A power outage detection means 1d detects a power outage/energization of the commercial power supply AC; an output means 1e outputs an on signal and an off signal; or as a slave clock, the function of the clock means 1a is activated to automatically adjust the current time of the clock means 1a to the hour if an external synchronization pulse is input within, for example, ±5 seconds on the hour. The main configuration is a timer operation control circuit 1 in which a one-chip microcomputer is provided with a parent/child clock switching means 1f for switching between a parent clock function and a child clock function, for example. This timer arithmetic control circuit 1 is normally supplied with DC power that is made constant by rectifying and smoothing commercial power AC in a power supply unit 3.
When a power outage occurs, DC power is supplied from a backup power source B consisting of a battery, and a key switch section 8 is composed of an output changeover switch 4 consisting of a momentary contact type push button switch, a select switch 5, a set switch 6, and a mode switch 7. and a function setting switch section 9 for setting functions to be described later are connected to the input port corresponding to the signal processing means 1c, and the above-mentioned liquid crystal display section 2 is connected to the port for outputting display data, and an on signal and an off signal are connected to the input port corresponding to the signal processing means 1c. The output port corresponding to the output means 1e for outputting the signal is provided with an external output section 10 for converting the output into two systems: a voltage-free contact output from the latching relay Ry and a pulse signal output for driving a so-called remote control breaker. A synchronization input/output unit 11 that connects and inputs and outputs synchronization pulses for the parent/child clocks.
is connected to the input/output port corresponding to the clock means 1a. Further, the output from the power supply section 3 is connected to an input port corresponding to the power failure detection means 1d. Second
The figure shows an overall perspective view of the embodiment, and the container body 12 in which each of the above circuits is housed is formed in the same shape as a ready-made breaker, and is installed in a panel such as a power distribution board or a control panel. The power input terminal 13, non-voltage output terminal 14, pulse signal output terminal 15, and synchronous pulse input/output terminal 16 are arranged on both ends, and the side is arranged to save installation space. The function setting switch 9 is located in the recess 17 provided therein. Furthermore, at the top, there is a liquid crystal display section 2 and switches 4 to 4 of the key switch section 8.
7 are arranged. Here, the mode switch 7 does not accept the select switches 5 and 6, and switches to the lock mode for displaying the current time, the program mode for setting the timer program, and the set mode for setting the current time in sequence. It is a switch that can be switched cyclically, and is also used to cancel the standby operating state (described later) in the event of a power outage.Select switch 5 is valid in modes other than lock mode, and when making settings or changes, it displays the hours, minutes, This is a switch for cyclically changing the settings for seconds, days of the week, etc. The set switch 6 is valid in a mode other than the lock mode, and is a switch for selecting a contact element at the above-mentioned setting point, and is incremented or sequentially advanced each time it is pressed. In addition, when selecting numerical values, for example, if you hold down the button for more than one second, you can fast-forward through the numerical values. Output switching switch 4 is a switch that is valid only in lock mode, and sets the output state to "auto" mode, which is a timer output according to the timer setting, or to continuous on or continuous off, regardless of the timer setting. This is for selecting either the "on" mode or the "off" mode. The power supply reset circuit 17 is a circuit for resetting the power supply of the timer operation control circuit 1, and the clock generation circuit 18 is a clock generation circuit for the timer operation control circuit 1.

The function setting switch section 9 is a switch 9a that selects whether the timer output output from the external output section 10 is a "timer" that outputs no voltage or a "pulse" that outputs a pulse signal, and a switch 9a that selects whether the timer output is a master clock function or a slave clock function. It also includes a 4-bit switch 9c that can set a time to delay the rise of the ON signal of the timer output when selecting a slave clock. Of course, since the rise and fall of the pulse output pulse signal are delayed by a set time, the width of the pulse signal is kept constant.

First, in this embodiment, when setting the current time, the mode switch 7 is set to the set mode. At this time, minutes and seconds are displayed on the liquid crystal display section 2, and in this set mode, the select switch 5 is pressed and the set switch 6 is used to set the seconds value to zero. Then select switch 5
Switch to hour and minute display using the keys and set the hour value using the set switch 6. When set switch 5 is further pressed, the minute is set, and set switch 6 is pressed.
Set the minute value by . Then, press the select switch 5 again to switch to the day of the week display, and in this state set the day of the week using the set switch 6.
Setting the current time is completed. Of course, if you only need to make corrections to the necessary parts, you can press the select switch 5 and skip the process. Since these setting conditions are displayed to the user by lighting and blinking the display on the liquid crystal display section 2, the user can easily set the current time by performing the above operations while looking at this display.

Next, we will explain how to set the timer. First, among the function setting switches 9, select the output selector switch 9a to select "timer" for no-voltage output.
Select "Pulse" for pulse signal output.
This selection status is displayed on the liquid crystal display section 2. Next, the mode switch 7 is used to set a program mode and select a program channel. Then, the operation time is set using the select switch 5 and the set switch 6. Then, the next program channel is selected and the operating time is set in the same way. Here, if output is set to "timer", the operation time is set on odd channels,
Then, the off operation time is set in the subsequent even-numbered channels. Furthermore, when the output is set to "pulse", the rise time of the pulse signal output is set for each channel. When the output is set to "Pulse", if you select the mode that displays "Pulse" in the program mode with mode switch 7, the seconds display will light up and you can set the pulse length with set switch 6 and select switch 5. .

Now, when the program settings are completed and the output is returned to the lock mode, when the output changeover switch 4 consisting of a push button switch is operated, the output will be set to the "auto" mode corresponding to the timer setting, or to the "on" mode (continuous off or continuous on). You can switch to "off" mode.

Then, when the signal processing means 1c detects that the time measured by the clock means 1a has reached the timer operation time, the output mode is set to, for example, "timer" and if the operation time corresponding to the ON operation is set, the output means 1e
generates an on signal, drives the drive circuit _10a1 of the external output section 10, causes the set coil of the latching relay Ry to release the electric charge charged in the drive capacitor C through the light emitting diode _L1 of the photocoupler 10b, and latches. By driving the switching relay Ry and turning on the relay contact r, the non-voltage output terminals 14 are short-circuited. Further, if the output mode is set to, for example, "timer" and the operation time corresponds to the off operation, the output means 1e generates an off signal, drives the drive circuit _10a2 of the external output section 10, and outputs the light emitting diode L of the photocoupler 10b. ₂ , the reset coil of the latching relay Ry discharges the electric charge stored in the driving capacitor C to drive the latching relay Ry, turning off the relay contact r and opening the voltageless output terminal 14.

At the same time, the photothyristors S ₁ and S ₂ of the photocoupler 10b are activated based on the ON signal and OFF signal that are alternately output from the output means 1e at each operation time.
to drive. Therefore, by turning on these photothyristors S ₁ and S ₂ , a drive current can flow to drive the connected so-called remote control relay (not shown), and in the output mode, an on signal with a preset pulse length and an off signal are generated. Since the signal is generated, the pulse width of the pulse signal output also corresponds to it. The remote control relay reverses its operation depending on the direction of flow of the drive current, and simultaneously switches the direction of energization of the energization circuit.

By the way, during normal operation, power is supplied from the commercial power supply AC, but when a power outage occurs as shown in FIG. A power failure is detected by the power failure detection means 1d, and at the same time as this detection, an off signal is output from the output means 1e regardless of the timer operation at this time or the settings made by the output switching switch 4, as shown in FIG. 4b. Be sure to flip the latching relay Ry to the off side. Then, the display operation of the liquid crystal display section 2 is stopped, the contents stored in the memory 1b are held, the clock means 1a continues the time measurement operation, and the mode switch 7 is the only one that accepts key inputs in the signal processing means 1c. The timer operation control circuit 1 shifts to the operating state. FIG. 5 shows a flowchart of the timer operation control circuit 1 after transitioning to standby operation, in which the mode switch 7
When the mode switch 7 is pressed, the signal processing means 1c that monitors the input from the power outage detection means 1d
The detection output is verified to determine whether or not there is a power outage, and if there is no power outage, the normal key acceptance operation is performed.
If there is a power outage, the above-mentioned standby operation state is canceled and the display on the liquid crystal display section 2 is restarted, and the normal key reception operation state is returned. In other words, even during a power outage, the timer operating time can be set and the current time can be set. If it is detected that, for example, 30 seconds have elapsed without any key input after each switch operation is completed and the mode returns to the current time display mode,
The timer operation control circuit 1 returns to the standby operating state.

Then, when the commercial power supply AC is restored and the power failure detection output disappears from the power failure detection means 1d, the standby operating state is canceled and the normal state returns. After a certain waiting time has elapsed since the power was re-energized, the data stored in the memory 1b is Based on the timer operation setting contents, for example, when the off operation time falls during a power outage period as shown in FIG. 4b, an off signal is generated from the timer operation output means 1e. Since it has already been forcibly turned off, the load (not shown) connected to relay contact r during the standby period is not energized as shown in Figure 4d, and the operation is different from the timer setting operation. is prevented. The standby time is the time until the capacitor C for driving the latching relay Ry is charged, and is set to about 3 seconds.

In this embodiment, since the latching relay Ry of the external output section 10 is driven by the ON signal and OFF signal,
Since there is a risk of malfunction if the ON signal and OFF signal are generated at short intervals, the signal processing means 1c uses the output means 1d to generate the ON signal and OFF signal in synchronization with the count of seconds counted by the clock means 1a. is controlled.

[Effect of idea]

The present invention provides an electronic timer configured as described above, which has a power failure standby function that operates the output means to generate the above-mentioned off signal when a power failure is detected, and at least maintains the memory contents and continues the timekeeping operation of the clock means. , the timer operation control circuit is provided with a return function that generates an on signal or an off signal from the output means based on the timer settings in the memory at the timing after the completion of charging of the driving capacitor when the commercial power is restored; If the OFF operation time is reached during a power outage, even if the power is restored, there is no period during which the latching relay is set and operating, so incorrect load operation will not occur, and the timer operation will turn on at the time of recovery. If the ON signal is generated after the drive capacitor has finished charging, the latching relay can be set and operated reliably, and even if the ON signal is generated, the latching relay will not be set. This has the effect that no such situation occurs.

[Brief explanation of drawings]

Figure 1 is an overall circuit diagram of an embodiment of the present invention;
The figure is an external perspective view of the same as above, Fig. 3 is a conceptual circuit block diagram of the main parts of the above, Fig. 4 is a time chart for explaining the operation of the above, and Fig. 5 is a flowchart for explaining the operation of the main parts of the above. Chart, FIG. 6 is a time chart for explaining the operation of the conventional example, where 1 is a timer calculation control circuit, 1a is a clock means, 1b is a memory, 1c is a signal processing means, 1d is a power failure detection means, and 1e is an output means. , 2 is a liquid crystal display section, 3 is a power supply section, 7 is a mode switch, AC is a commercial power source, B is a backup power source, Ry is a latching relay, and r is a relay contact.

Claims (1)

[Scope of utility model registration request] Under normal conditions, power is supplied by commercial power,
A clock means that is supplied with power from a backup power source such as a battery in the event of a power outage, and a memory that stores time for timer operation such as days, hours, minutes, and seconds;
Signal processing means that captures key inputs for timer settings, current time settings, etc., generates display data to display the current time, timer information, etc. on a display means, and generates on and off signals. It has a timer arithmetic control circuit that includes at least an output means and a power failure detection means for detecting a power outage of the commercial power source, a driving capacitor that is charged with the power of the commercial power source, and a driving capacitor that is connected to the set coil by the above-mentioned ON signal. The latching relay is provided with at least a latching relay in which the charged charge of the driving capacitor is discharged and the charged charge of the driving capacitor is discharged to the reset coil in response to an off signal, and an external output section that generates a non-voltage output from the relay contact of the latching relay. The electronic timer has a power outage standby function that operates the output means to generate the above off signal when a power outage is detected, retains the memory contents, and continues the clocking operation of the clock means, and a power outage standby function that at least operates the output means to generate the above-mentioned off signal when a power outage is detected, and the above-mentioned drive function when commercial power is restored. An electronic timer characterized in that the timer operation control circuit is provided with a return function for generating an on signal or an off signal from an output means based on the timer setting contents of the memory at a timing after charging of the capacitor is completed.