JPS5916690B2 - Self-holding switch circuit with built-in timer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a self-holding switch circuit that is convenient for use as a switch in electrical equipment that does not want to continue operating after a power outage when a power outage occurs during operation, and particularly relates to a timer. This type of switch circuit has a built-in switch circuit.

For example, an oil burner such as an oil stove - C1
Some use electric circuits to control ignition, fuel supply, and air blowing.

In such devices, combustion will stop if a power outage occurs during combustion, but if the power is not turned off,
After the power outage ends, it will automatically reignite, which is dangerous in many ways.

For this reason, a switch circuit is used in which a relay and a pushbutton switch are connected in series, and an operation closing contact of the relay is connected in parallel to the pushbutton switch.

In this switch circuit, the relay self-holds when the push button is operated, and power is supplied to the load. When a power outage occurs, the relay's self-holding is released, so power can be supplied to the load when the power is turned on again. do not have.

On the other hand, it is convenient for various electrical devices to be equipped with a timer circuit that automatically starts or stops the device after a certain period of time.

For example, in the case of the above-mentioned kerosene stove, it would be convenient if it could be turned off automatically even when you go to bed while keeping warm, or it could be turned on automatically before you wake up.

It is therefore an object of the invention to provide a self-holding switch circuit of the above-mentioned type incorporating a timer circuit.

The main object of the present invention is to provide a self-holding switch circuit that can be turned on after a certain period of time and turned off after a certain period of time using a single timer.

Another object of the present invention is to enable control to turn on after a certain period of time and control to turn off after a certain period of time with one timer, and to change the timer set for automatic off control to automatic on control with the push of a button. To provide a self-holding switch circuit whose settings can be easily changed with a single operation.

The present invention is a simple circuit realized by simply adding one timer and one relay to the above-described self-holding switch circuit.

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

゛Figure 1 is a circuit showing one embodiment of the present invention, in which relay 1
A timer 4, a relay 7, and a pushbutton switch 10 are added to a conventional self-holding switch circuit in which an operation close switch 2 is connected in series to the operation close switch 2, and a pushbutton switch 3 is connected in parallel to the operation close switch 2. and a switch 11 that is turned off during load power supply.

That is, the relay 1 is connected in series with the operating close switch 5 of the timer 4 and the normally closed push button switch 10.
The second switch 6 of the timer 4 is inserted and connected to the connection circuit between the pushbutton switch 3 and the relay 1.

In this case, the pushbutton switch 3 and the relay 1 are connected via the normally closed contact side a of the switch 6.

The operation close contact side of the switch 6 is connected to the relay 7,
While the timer 4 is operating, the pushbutton switch 3 is connected to the relay 1.
It is not connected to the relay 7, but is connected in series with the relay 7.

Note that the relay 7 is configured to delay operation and recovery using a resistor R and a capacitor C.

If the timer 4 is an electric type, it may be connected in parallel with the relay 7, and if the timer 4 does not require power supply, such as a mechanical timer, only its operation switches 5 and 6 need be connected to the circuit.

The operation switch 8 of the relay 7 is arranged such that its normally closed contact side a is parallel to the series circuit of the timer switch 5 and the pushbutton switch 10, and its operation closed contact side is parallel to the pushbutton switch 3. It is connected to the.

Further, a second operating close switch 9 is added to the relay 1, and this is connected in parallel to the push button switch 3.

The switch 11 is, for example, a delayed action recovery type switch that is provided in the load RL and turns off during load power supply, and in some cases, a delayed action recovery type relay is provided in parallel with the relay 1. It may also be realized as a relay switch.

Note that RL is a load circuit and is connected in parallel to the relay 1, but it will be easily understood that power can also be supplied as a series load.

Further, V is a power source.

The operation of this circuit will be explained.

First, when the pushbutton switch 3 is pressed in the illustrated state where the timer 4 is not set, the power supply V is connected to the relay 1 through the normally closed contact side a of the timer switch 6, and the operation switch 2 is closed. Since the power is connected to relay 1 through the normally closed contact side a of switch 8 of relay 7,
Even if the pushbutton switch 3 is released and turned off, the relay 1 maintains its self-holding state and can therefore continue supplying power to the load circuit RL.

Note that the switch 11 is off in this state.

During a power outage, the power supply to relay 1 is cut off, so its operating switches 2 and 9 are turned off, and the self-holding circuit is released. Therefore, even when power is re-energized after a power outage, the load circuit RL remains unchanged unless pushbutton switch 3 is operated. never starts.

That is, it operates in exactly the same way as a conventional self-holding switch circuit.

Next, when the timer 4 is set while the relay 1 is self-holding and feeding power to the load circuit RL as described above,
The timer switch 5 is turned on, and at the same time, the timer switch 6 is switched to the b side.

As a result, relay 1 maintains self-holding via timer switch 5, pushbutton switch 10, and relay switch 2, while relay T is supplied with power via relay switch 9 and timer switch 6, and operates with a delay.

As a result, the relay 7 is still powered via the b-side contact of the relay switch 8.

After that, when the time set in the timer 4 has elapsed, the timer switch 5 is turned off and the timer switch 6 is switched to the a side.

As a result, the power supply circuit of the timer switch 5, pushbutton switch 10, and relay switch 2 to the relay 1 is cut off, so that the self-holding of the relay 1 is released.

Note that at this time, by switching the timer switch 6 to the a side, power is supplied to the relay 1 via the b side contact of the relay switch 8.
is off, so it is prevented.

Therefore, power supply can be automatically stopped after the time set by the timer 4.

Next, while relay 1 is self-holding and supplying power to the load, timer 4
The operation when the pushbutton switch 10 is pressed before the time set on the timer has elapsed after setting will be described.

After the timer 4 is set, the timer switch 5 is turned on, and the relay 1 is supplied with power through the timer switch 5, the pushbutton switch 10, and the relay switch 2, and is self-maintained.

Switch 11 is in an off state.

If the pushbutton switch 10 is pressed to turn it off, the power supply circuit of the relay 1 is temporarily cut off, so the relay 1 is restored, the relay switch 2 is turned off, and the self-holding of the relay 1 is released.

On the other hand, since the timer switch 6 remains switched to the b side, the relay 7 remains self-maintaining since it is supplied with power through the b side contact of the relay switch 8.

After the self-holding of the relay 1 is released, the switch 11 is turned on, but since the timer switch 6 has been switched to the b side, power is not supplied to the relay 1.

Thereafter, when the time set in the timer 4 has elapsed, the timer switch 5 is turned off and at the same time the timer switch 6 is switched to the a side.

As a result, power is supplied to the relay 1 through the b-side contact of the relay switch 8, the a-side contact of the timer switch 6, and the switch 11, and the relay 1 operates.

As a result, relay switch 9 and timer switch 6 a
Through the side W point and the switch 11, the relay 1 is self-holding, and then, by the delayed recovery of the relay 7, the relay 1 is activated through the a side contact of the relay switch 8 and the relay switch 2.
continues to maintain self-preservation.

Therefore, even if the switch 11 is subsequently turned off due to load operation, the self-holding state of the relay 1 is not released.

That is, after setting the timer while power is being supplied to the load RL,
By pressing the pushbutton switch 10, power supply to the load can be stopped and the timer 4 can be automatically switched to operate as an automatic power supply timer.

If you want to automatically supply power using timer 4 after a certain period of time,
First, timer 4 is cented.

As a result, the timer switch 5 is turned on and the timer switch 6 is switched to the b contact side.

After that, when the pushbutton switch 3 is pressed, the relay 7
is supplied with power and its switch 8 is switched to the b side, so even if the pushbutton switch 3 is released, the relay 1 is self-held.

This state is the same as the state in which the self-holding of the relay 1 is released by pressing the pushbutton switch 10 after setting the timer described above.

Therefore, after the time set in the timer 4 has elapsed, the operation of the relay 1 self-holding and starting supplying power to the load Rr is the same as described above.

As described above, according to the present invention, one timer 4 can be used to control the on or off operation of a self-holding switch circuit, and the push button switch 10 can be added to turn off this switch circuit after a certain period of time. You can change the timer that was set to turn on after a certain period of time.

FIG. 2 shows another embodiment of the present invention, in which the pushbutton switch 3 and the pushbutton switch 10 are connected to a microswitch 31.
The pushbutton switch 3 corresponds to the operation switch 310-b of the microswitch 310.
The pushbutton switch 10 corresponds to the normally closed switch 310-a of the microswitch 310.

This circuit can also perform the same operation as the above embodiment.

In the embodiment shown in FIG. 2 as well, the b-side contact of the relay switch 8 of the relay 7 is a push button switch (micro switch 3).
10-b) in parallel.

FIG. 3 shows a circuit in which the present invention is applied to the side circuit of a kerosene stove.

In this figure, parts corresponding to those in FIG. 1 are designated by the same reference numerals as in FIG. 1.

Referring to FIG. 3, MS is an operation switch that is turned on during operation.

The switch 3 here uses a micro-sinch, and when the operation switch MS is turned on, it is temporarily engaged with the operation H and is turned on temporarily.

TH is a temperature switch, which is turned on when the combustion tube reaches a certain temperature or higher, and a relay RL1 is connected to the power source in series with this switch.

Relay RL1 has switches 11 and 11 as its operating contacts.

In parallel with relay RL1, there is a motor M of a blower for blowing out warm air.
1 is connected.

Sl is a solenoid valve for supplying a small amount of fuel, and liquid is drained to the DC output side of a diode double-wave rectifier D1 connected in parallel with the relay 1.

S2 is a solenoid valve for supplying a large amount of fuel, and is connected in series with the room temperature switch RT to the DC output side of the diode double-wave rectifier D2, and the diode double-wave rectifier D2 operates the operation switch 11' of the relay RL1. It is connected in parallel to relay 1 with the closed contact side closed.

H is an ignition heater connected to the secondary side of the transformer T, and the secondary side of the transformer T is connected in parallel to the relay 1 via the normally closed contact side of the operation switch 11' of the relay RL1.

M2 is a combustion blower motor, which is connected in parallel to the relay 1 by connecting the normally closed contact side of the switch 11 of the relay RL1.

Rb2 is a relay whose operation and recovery are delayed by an associated resistor and capacitor, and dl and d2 are its operation switches.

In this circuit, when relay 1 is self-holding, power is supplied to solenoid valve S1 via diode double-wave rectifier D1,
This supplies fuel to the combustion chamber.

On the other hand, power is supplied to the heater H through the normally closed contact of the switch 11' of the relay RL1, and further to the motor M2 through the normally closed contact of the switch 11, so that air for combustion is sent to the combustion chamber.

As a result, combustion starts.

On the other hand, since the relay RL2 is connected in parallel with the motor M2 via the a-side contact of the timer switch 6 and the operating/closing contact 9 of the relay 1, the relay RL2 operates and is self-maintained by turning on the switch d2.

After combustion starts, when the temperature of the combustion tube reaches a predetermined temperature or higher, the temperature switch TH is turned on, so the motor M1 of the hot air blower operates to blow out warm air, and the relay RL1 operates. Then, the solenoid valve S2 is supplied with power through the operating close contact of the operating switch 11', and a large amount of fuel is supplied to the combustion chamber to enter the heating operation.

At this time, the switch 11 of the relay RL1 is also switched to the operating close contact side, and as a result, the motor M2 of the combustion blower is switched to the operating close contact d1 of the self-held relay RL2. d2 is supplied with power.

When the indoor temperature switch RT turns off as the indoor temperature rises, the solenoid valve S2 closes and stops the combustion supply, so only the small amount of fuel supplied by the solenoid valve S1 continues to burn, and as the indoor temperature drops, When the indoor temperature switch RT is turned on, the solenoid valve S2 is opened again, and a large amount of fuel is supplied to the combustion chamber, where it is combusted and the indoor temperature is raised.

This operation continues thereafter.

By the way, this circuit is equipped with a self-holding switch circuit equipped with timers 1 to 11 as explained in FIG. Since the heater can be turned off, that is, automatically extinguished, it is possible to go to bed while keeping warm with the heater.

On the other hand, if you set the timer 4 and operate the operation switch MS while the combustion is stopped, the relay 1 will be energized after a certain period of time and this can be maintained by itself, so the combustion machine will start combustion after a certain period of time. Since ignition is possible, by setting the timer 4 before going to bed and operating the operation switch, the combustion machine can be automatically ignited in the morning before waking up.

In addition, the push button switch 10 can be used to switch the timer control from self-holding release to self-holding setting of the relay 1, so while the night burner is operating, you can set the time you want to ignite the next morning on the timer. By simply pressing the push button switch 10 at bedtime, combustion can be stopped and ignition can be automatically started the next morning, so the operation at bedtime is extremely simple.

As described above, according to the present invention, since the ON or OFF operation of a self-holding switch circuit can be controlled using one timer, it is suitable for use as a power switch circuit of a device such as an oil-burning machine, for example. In addition, the timer control operation can be switched from automatic off control to automatic on control simply by operating the push button switch, so you can set the time you want to restart the device while enjoying the operating status of the device. You can easily stop the operation by pressing a button, and it is convenient to restart it at the time set on the timer.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a self-holding switch circuit according to one embodiment of the present invention, FIG. 2 is a circuit diagram showing another embodiment of the present invention, and FIG. 3 is a circuit diagram showing a self-holding switch circuit according to an embodiment of the present invention. FIG. 2 is a circuit diagram showing an example of application to a combustion control circuit. 1...Relay, 2...Relay 1 operation switch, 3
...Push button switch, 4...Timer, 5,6...
・Timer switch, 7... Delayed action/recovery type relay, 8... Relay 7 operation switch, 9... Relay 1
operation switch, 10... push button switch, 11.
...Delayed operation recovery type switch, RL...Load circuit.

Claims (1)

[Claims] 1. A normally open pushbutton switch 3 connected in parallel with a first relay 1 and a first operating close switch 2 of the second relay and in series with the second relay. In a self-holding switch circuit, the first relay is self-held by operating the pushbutton switch and supplies power to a load circuit RL connected in parallel or series with the second relay, A timer 4 is provided, a first operating close switch 5 which is an operating switch of the timer is connected in series with the first switch of the first relay, and a second normally closed switch 6-a of the timer is connected in series with the first switch of the first relay. A second relay 7 of the delayed operation recovery type is connected in series to the pushbutton switch through the third operation close switch 6-b of the timer, which is inserted into the connection between the pushbutton switch and the first relay. , the first regular switch 8-a of the second relay is connected in parallel with the first switch of the timer, and the second operating close switch B-b of the second relay is connected in parallel with the first switch 8-a of the second relay. a delayed operation recovery type switch 11 connected in parallel to the pushbutton switch, connecting the second operation close switch 9 of the first relay in parallel to the pushbutton switch, and turning off while power is being supplied to the load; is inserted and connected between the second switch of the timer and the first relay so that the one timer can control the automatic setting or automatic release of the self-holding of the first relay. Built-in self-holding switch circuit. 2 comprises a first relay 1 and a normally open first pushbutton switch 3 connected in parallel with the first operating close switch 2 of the second relay and in series with the second relay; death,
In a self-holding switch circuit, the first relay is self-held by operating the second pushbutton switch, and power is supplied to a load circuit RL connected in parallel or series with the second relay, A timer 4 is provided, and a series circuit of a first operating close switch 5, which is an operating switch of the timer, and a normally closed second pushbutton switch 10 is connected in series with the first switch of the first relay. , the second normally closed switch 6-a of the timer is inserted and connected to the connection between the first pushbutton switch and the first relay, and the third normally closed switch 6-b of the timer is connected. A delayed action recovery type second relay T is connected in series to the first pushbutton switch, and a first normally closed switch 8-a of the second relay is connected in parallel to the first switch of the timer. The second operation close switch 8-b of the second relay is connected in parallel with the first pushbutton switch, and the second operation close switch 9 of the first relay is connected in parallel with the first pushbutton switch. A delayed operation recovery type switch 11 connected in parallel to the first pushbutton switch and turned off while power is being supplied to the load.
is inserted and connected between the second switch of the timer and the first relay, so that the timer can automatically set or release the self-holding of the first relay, and is set to the automatic release. A self-holding switch circuit with a built-in timer that can switch the timer to automatic setting operation by operating the second pushbutton. 3. In the circuit according to claim 2, the first pushbutton switch and the second pushbutton switch are configured by an operation close switch 310-b and a normally closed switch 310-a of the microswitch 310, respectively. . 4% Allowance In the circuit according to claim 1, 2, or 3, the timer is an electric timer, and the electric timer is connected in parallel to the second relay.