JP2738805B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device such as a gas stove.

[0002]

2. Description of the Related Art It is generally known that a combustion device such as a gas stove performs various combustion controls by a microcomputer. In this type of combustion device, a thermoelectric device provided near a burner is usually used. A combustion signal generation circuit that receives a signal from an equivalent sensor and outputs a signal corresponding to a combustion state of the burner, and when a signal corresponding to a misfire state of the burner is output from the combustion signal generation circuit,
The microcomputer outputs a solenoid valve closing command signal to a solenoid valve drive circuit provided in the fuel supply path to the burner, thereby closing the solenoid valve by the drive circuit to supply fuel to the burner. I try to cut off.

Further, in such a combustion apparatus that performs various combustion controls using a microcomputer, for example, when the microcomputer runs away due to disturbance or the like, a signal corresponding to the misfire state of the burner is output from the combustion signal generation circuit. Is output, the microcomputer may not be able to close the solenoid valve without outputting a valve closing command signal of the solenoid valve. When a signal corresponding to is output, after a lapse of a predetermined time from the output point, an auxiliary circuit that outputs a valve closing command signal of the solenoid valve to the solenoid valve drive circuit without using a microcomputer is provided. An electromagnetic valve which is closed by the above-mentioned method has been proposed by the present applicant (Japanese Patent Application No. 5-450).
No. 35).

By the way, in this type of combustion device,
As the power source of the microcomputer or the combustion signal generation circuit, the solenoid valve drive circuit, and the like, there are a type using a commercial power source and a type using a battery power source. A commercial power supply or a battery power supply is always supplied to each circuit through a power supply circuit, and these circuits are always activated.

However, conventionally, since the power supply to the combustion signal generating circuit and the like is always performed during the operation of the combustion apparatus, especially in a combustion apparatus using a battery as a power supply,
There is an inconvenience that the battery is quickly consumed and the battery must be replaced frequently.

In particular, as described above, if an auxiliary circuit is provided so that the solenoid valve can be closed when the burner misfires even if the microcomputer runs out of control, the combustion signal generation circuit becomes Since signals are output to both the computer and the auxiliary circuit, the power consumption increases, and there is a disadvantage that the battery is consumed more.

[0007]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention provides a combustion apparatus which includes a combustion signal generation circuit and a microcomputer using a battery as a power source, and controls the combustion section by the microcomputer. It is an object of the present invention to provide a combustion apparatus that can reduce the electric power as much as possible to extend its life, and can reliably shut off fuel supply to the combustion section when the combustion section is misfired.

[0008]

In order to achieve the above object, the present invention provides a combustion signal generating circuit for outputting a signal corresponding to a combustion state of a combustion section using a battery as a power supply, and a combustion signal generating circuit using the battery as a power supply. A combustion device comprising: a microcomputer that controls the operation of the combustion unit according to an output signal of a generation circuit; and a power supply circuit that supplies the battery power to the microcomputer and the combustion signal generation circuit.
A switching element that is periodically turned on and off by applying a pulse signal from the microcomputer is provided on a power supply path from the power supply circuit to the combustion signal generation circuit, and the combustion signal when the switching element is turned on is provided. The operation of the combustion section is controlled by the microcomputer in accordance with an output signal of the generation circuit.

Further, an electromagnetic valve provided in a fuel supply path for supplying fuel to the combustion section, and a microcomputer which outputs a signal corresponding to a misfire state of the combustion section from the combustion signal generation circuit. An electromagnetic valve drive circuit that closes the electromagnetic valve by inputting a valve closing command signal of the electromagnetic valve, and a signal corresponding to a misfire state of the combustion unit from the combustion signal generation circuit is shorter than a cycle of the pulse signal. An auxiliary circuit for outputting a valve closing command signal to the electromagnetic valve drive circuit when continuously output for a long predetermined time, wherein the combustion signal generation circuit supplies the auxiliary circuit when the power is not supplied to the auxiliary circuit. And the output to the auxiliary circuit when the combustion section is in a misfire state is configured to be the same.

[0010]

According to the present invention, by applying a pulse signal from the microcomputer to the switching element, the switching element is periodically turned on and off, and in response to this, the power supply circuit switches the combustion signal generation circuit. The power supply of the battery power to the power supply is periodically disconnected. Therefore, the power consumption of the combustion signal generation circuit is reduced. In this case, since the switching element merely performs a conduction / shutoff operation, it consumes almost no power, and the conduction / shutoff operation of the switching element is performed by a pulse signal from an existing microcomputer. Therefore, a circuit that consumes power is not required, and therefore, it is possible to minimize battery consumption. Further, the operation control by the microcomputer in accordance with the combustion state of the combustion unit is performed only when power is supplied to the combustion signal generation circuit, but the cycle of conduction / interruption of the switching element, that is, the cycle of the pulse signal Is sufficiently short, the operation control of the combustion unit according to the combustion state of the combustion unit can be performed momentarily without any trouble.

In general, a microcomputer can easily output the above-described pulse signal by setting a program thereof, and a clock signal normally provided in the microcomputer is changed to the pulse signal. It is also possible to use as.

Further, when a signal corresponding to the misfire state of the combustion section is output from the combustion signal generation circuit, a command to close the solenoid valve is input from the microcomputer to the solenoid valve drive circuit. In the case of closing the solenoid valve, when the output to the auxiliary circuit when the combustion signal generation circuit is not supplied with power and the output to the auxiliary circuit in the misfire state of the combustion unit are configured to be the same, In the event of a misfire of the combustion part, the microcomputer runs away or breaks down, so that the pulse signal is not applied to the switching element and the switching element does not operate. Even in the case where power supply is not performed, a signal corresponding to the misfire state of the combustion unit is sent from the combustion signal generation circuit to the auxiliary circuit. To be the force, the signal is the predetermined time, is continuously output, closing command signal of the electromagnetic valve to the electromagnetic valve driving circuit from the auxiliary circuit is output. This makes it possible to close the electromagnetic valve by the electromagnetic valve drive circuit and cut off the fuel supply to the combustion section. Note that the predetermined time is longer than the cycle of the pulse signal, that is, the cycle of the cutoff of power supply to the combustion signal generation circuit.
When the microcomputer is normal and the combustion unit is burning normally, and the combustion signal generation circuit is temporarily in a non-power supply state, the auxiliary circuit issues a solenoid valve closing command. No signal is output, so that the solenoid valve is not closed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One example of the present invention will be described with reference to FIGS. FIG. 1 is an explanatory system configuration diagram of the combustion device of the present embodiment, and FIG. 2 is a circuit configuration diagram of a main part of the combustion device of FIG.

In FIG. 1, the combustion apparatus of the present embodiment is, for example, a gas stove. In the figure, reference numeral 1 denotes a burner as a combustion unit, and 2 denotes a gas supply path 3 for supplying gas (fuel) to the burner 1. An electromagnetic valve provided in the gas supply path 3 (fuel supply path) to open and close the valve 4 is a gas amount adjusting valve provided in the gas supply path 3 to adjust the gas supply amount to the burner 1, and 5 is a burner 1 A combustion detector provided near the burner 1 for detecting abnormal combustion such as misfire or lack of oxygen, 6 is an ignition electrode for igniting the burner 1, and 7 is a burner 1 for detecting the cooking temperature of the food. A temperature detector provided at the center, 8 is a control unit having a microcomputer and the like described later, 9 is
An ignition / extinguishing button 10 for performing a fire extinguishing operation is an operation unit for performing operations such as selection and setting of various automatic cooking menus.

The solenoid valve 2 is opened mechanically against a spring (not shown) in conjunction with the ON operation of the ignition / extinguishing button 9, and at the same time, the control unit 8 sends the solenoid valve 11 to the solenoid 11 of the solenoid valve 2. The valve is kept open by energizing,
Further, the valve is closed by the spring by cutting off the current supply to the solenoid 11. The opening of the gas amount adjusting valve 4 is adjusted by operating the operating element 12 connected thereto.

The combustion detector 5 comprises a thermocouple described later,
The electromotive force of the thermocouple according to the combustion state of the burner 1 is output to the control unit 8. In addition, the temperature detector 7
Has a built-in temperature sensor such as a thermistor (not shown), and outputs a signal of the temperature sensor according to the cooking temperature of the food to the control unit 8.

The ignition electrode 6 generates an ignition spark by a sparker 13 which is driven and controlled by the control unit 8 when the burner 1 is ignited. In FIG. 1, reference numeral 14 denotes an electromagnetic valve for adjusting a gas supply amount to the burner 1 under the control of the control unit 8.

Next, the configuration of the control unit 8 will be described in detail with reference to FIG.

In FIG. 2, the control unit 8 includes a battery 1
5, a microcomputer 16 (hereinafter simply referred to as a microcomputer 16), a combustion signal generating circuit 17, an auxiliary circuit 18, and an electromagnetic valve driving circuit 19 for driving the electromagnetic valve 2. A power supply circuit 20 for supplying power to the microcomputer 15, the circuits 17 to 19, and the like with the battery 15, and the power supply circuit 20 and the combustion signal generation circuit 1.
7 and a switching transistor 21 which is a switching element interposed therebetween.

The power supply circuit 20 includes a regulator 22 connected to the battery 15, a switching transistor 23 having an emitter connected to an output point A of the regulator 22,
A switching transistor 24 having a collector connected to the base of the transistor 23;
The regulator 22 is connected via a microswitch 26 which is turned ON / OFF in conjunction with the ON / OFF operation of the ignition / extinguishing button 9. The regulator 22 receives the battery voltage VD and reduces the voltage to an appropriate level. Voltage VR1 (hereinafter, referred to as
(Referred to as a regulator voltage VR1). The emitter of the transistor 24 is grounded.

With this configuration, when the ignition / extinguishing button 9 is turned on, the micro switch 26 is turned on, and the regulator voltage VR1 (high-level voltage) is applied to the transistor 24 via the resistor 25 and the micro switch 26. The voltage is applied to the base, thereby conducting between the emitter and the collector of the transistor 24. Then, a low level voltage is applied to the base of the transistor 23 due to the conduction, and conduction between the emitter and the collector of the transistor 23 is performed, whereby the output point B (collector) of the transistor 23 is connected to the regulator voltage VR1. A substantially equal voltage VR2 is generated. The power supply circuit 20 supplies the voltage VR2 generated at the output point B of the transistor 23 to the power supply terminal C of the microcomputer 16, the power supply terminal D of the combustion signal generation circuit 17, and the power supply terminal E of the auxiliary circuit 18 as a power supply voltage. I am trying to do it. Further, the power supply circuit 20 supplies the voltage VR3 (≒ regulator voltage VR1) generated at the input point F (base) of the transistor 24 as the power supply voltage to the solenoid valve drive circuit 19 when the microswitch 26 is turned on. I have to.

In this case, the switching transistor 21 is interposed between the power supply terminal D of the combustion signal generation circuit 17 and the output point B of the power supply circuit 20, and the base of the transistor 21 is connected to the microcomputer 16 Output terminal G
It is connected to the. The microcomputer 16 outputs a pulse signal P composed of a high-low binary signal from the output terminal G. In the present embodiment, the cycle of the pulse signal P is set to 1
00 ms, the low-level signal within one cycle is 20 ms, and the high-level signal is 80 ms. The switching transistor 21 is connected to the power supply circuit 2.
0 transistor 23 (the output point B has a voltage VR2
Is generated), the transistor 21 conducts when a low-level signal is applied to the base of the transistor 21 and shuts off when a high-level signal is applied.
Therefore, by applying the pulse signal P to the base of the transistor 21, the transistor 21 is turned on and off.
The interruption is periodically repeated, whereby the power supply circuit 2
From 0, power is supplied to the combustion signal generation circuit 17 periodically.

The combustion signal generation circuit 17 includes a pair of amplifiers 28 and 29 for amplifying electromotive voltages according to the combustion state of the burner 1 of the thermocouple 27 constituting the combustion detector 5, respectively.
By comparing the output voltage of the amplifier 29 with a predetermined reference voltage, signals corresponding to the combustion state of the burner and the misfire state (including an abnormal combustion state due to oxygen deficiency or the like) are respectively set to high or low.
A comparator 30 for outputting a signal of a value level. In this case, the comparator 30 has its output point H
Becomes low when a voltage corresponding to the combustion state (ignition state) of the burner 1 is input from the thermocouple 27 via the amplifier 29, and a voltage corresponding to the misfire state of the burner 1 is output from the thermocouple 27 to the amplifier. It is provided with such a polarity that it is opened inside the comparator 30 when it is inputted through the line 29. The output point H is connected to an output point B (voltage VR2) of the power supply circuit 20 via a resistor 31.
As a result, a high-level signal is generated at the output point H of the comparator 30 from the thermocouple 27 via the amplifier 29 from the voltage corresponding to the misfire state of the burner 1.

The output of the amplifier 28 is input to an input terminal I of the microcomputer 16, and the microcomputer 16 compares the output of the amplifier 28 with a reference voltage in the same manner as the comparator 30, so that the burner 1 burns and misfires. Is detected. The reference voltage of the comparator 30 is generated by dividing the battery voltage VD by a pair of resistors 32 and 33. The amplifiers 28 and 29 and the comparator 30 are activated by supplying a power supply voltage from a power supply terminal D.

The solenoid valve drive circuit 19 includes a pair of switching transistors 35 and 36 connected in series to the solenoid 11 of the solenoid valve 2 via a resistor 34, and a switching transistor formed by connecting the collector to the base of the transistor 36. 38, and the transistors 35 and 36 are further connected in series via a resistor 37 to an input point F of the transistor 24 of the power supply circuit 20 so as to receive a power supply voltage from the power supply circuit 20. Also, the transistor 35
Is connected to the output terminal J of the microcomputer 16, and the base and the emitter of the transistor 38 are connected to the output terminal K of the microcomputer 16 and the auxiliary circuit 18, respectively.

Although details will be described later, the transistor 35 of the solenoid valve driving circuit 19 is connected to the output terminal J of the microcomputer 16.
When a low-level signal is applied to the base of the transistor 35, the transistor 35 is turned on, and when a high-level signal (an electromagnetic valve closing command signal) is applied to the base, the transistor 35 is turned off. The transistor 36 is turned on by applying a low-level signal to the base of the transistor 36 by turning on the transistor 38 by the microcomputer 16 and the auxiliary circuit 18, and turning on the transistor 38 by the microcomputer 16 or the auxiliary circuit 18. When the base current of the transistor 36 is cut off as the cutoff state, the cutoff state is set. When the transistors 35 and 36 are in the conductive state, the solenoid valve driving circuit 19 turns on the power supply circuit 2.
The solenoid 11 is energized from 0, thereby keeping the solenoid valve 2 open, and by shutting off one of the transistors 35 and 36, the power to the solenoid 11 is shut off and the solenoid valve 2 is closed. I have.

The auxiliary circuit 18 includes the solenoid valve driving circuit 19
Circuit 39 which receives the voltage on the transistor 35 side of the resistor 34 and the output voltage of the comparator 30 as inputs.
A switching transistor 40 whose base input is the output of the NAND circuit 39, a delay circuit 41 whose input is the collector output of the transistor 40,
, A NAND circuit 42 having two outputs of the NAND circuit 42,
A switching transistor 43 having an output of the circuit 42 as a base input. In this case, the delay circuit 41 is configured by a time constant circuit including a resistor 44 and a capacitor 45, and the charge / discharge voltage of the capacitor 45 is set to NA.
The signal is output to the ND circuit 42. The emitter of the transistor 40 is connected to a power supply terminal E to which the voltage VR2 is supplied from the power supply circuit 20, and the transistor 43 has its emitter grounded and its collector connected to the emitter of the transistor 38. .

As will be described later in detail, the auxiliary circuit 18
In the open state of the solenoid valve 2, a high-level signal corresponding to the misfire state of the burner 1 is determined by the comparator 30 of the combustion signal generation circuit 17 for a predetermined time determined by the time constant of the delay circuit 41 (in this embodiment, For example, 40 seconds or less,
When the output is continued, the transistor 36 is turned off via the transistor 38, thereby shutting off the power supply to the solenoid 11 and closing the solenoid valve 2.

Next, the operation of the combustion apparatus of the present embodiment will be described.

When the ignition / extinguishing button 9 is turned on, the microswitch 2 of the power supply circuit 20 is operated in conjunction with this operation.
6 is turned on, and the transistors 24 and 23 are
Are sequentially conducted. As a result, the voltage VR3 applied to the input point F of the transistor 24 is supplied to the solenoid valve driving circuit 19, and the voltage VR2 generated at the output point B of the transistor 23 is connected to the power supply terminal C of the microcomputer 16 and the auxiliary circuit 18 Power is supplied to the power supply terminal E and the emitter of the switching transistor 21, and these are activated.

The microcomputer 16 is supplied with an input signal of the micro switch 26 through an appropriate circuit (not shown).

As described above, when the microcomputer 16 is activated and further the input signal of the micro switch 26 is inputted, the microcomputer 16 outputs high-level and low-level voltage signals from the output terminals K and J, respectively, to the transistors 38 and 35. Apply to base. On the other hand, when the auxiliary circuit 18 is started, the capacitor 45 of the delay circuit 41 is discharged, that is, the voltage of the capacitor 45 is at a low level, and therefore, the output voltage of the NAND circuit 42 is low. Becomes high level, and the high level voltage is applied to the base of the transistor 43.

The application of the high-level voltage signal to the base of the transistor 38 and the application of the high-level voltage signal to the base of the transistor 43 cause the transistors 38 and 43 to conduct to the ground side, Thus, a low-level voltage signal is applied to the base of the transistor 36.

Accordingly, a low-level voltage signal is applied to the bases of the transistors 35 and 36 of the solenoid valve driving circuit 19, whereby the transistors 3
5 and 36 are conducted, and the solenoid 11 is energized. At this time, the solenoid valve 2 is mechanically opened against a spring (not shown) in response to the ON operation of the ignition / extinguishing button 9, and is further opened by energizing the solenoid 11. The valve opening is maintained. When the solenoid valve 2 is opened, gas is supplied to the burner 1.

In this operation, the microcomputer 1
Under the control of 6, the sparker 13 is driven, and the ignition electrode 6 generates a spark discharge, whereby the burner 1 is ignited.

On the other hand, in parallel with this operation, the microcomputer 16 outputs the pulse signal P from the output terminal G to the base of the transistor 21, whereby the high-level voltage signal is applied to the base of the transistor 21. And a low-level voltage signal are alternately applied periodically. For this reason, the transistor 21 periodically repeats its conduction and cutoff, and at the time of conduction, the voltage VR2 at the output point B of the transistor 23 of the power supply circuit 20 is supplied to the power supply terminal D of the combustion signal generation circuit 17 and The combustion signal generation circuit 17 starts. In this case, the period of conduction / interruption of the transistor 21 is sufficiently short as described above, and although there is substantially no difference from the case where power is constantly supplied to the combustion signal generation circuit 17,
Since the power supply is performed intermittently, the amount of power supply from the power supply circuit 20 to the combustion signal generation circuit 17 may be relatively small,
Therefore, the consumption of the battery 15 is reduced.

When the combustion signal generation circuit 17 is started, the combustion signal generation circuit 17 outputs an electromotive voltage signal corresponding to the combustion state of the burner 1 to the input terminal I of the microcomputer 16 via the amplifier 28, and 16 outputs the signal to A
After the / D conversion, the combustion / misfire of the burner 1 is detected by comparing with a predetermined determination value.

When the microcomputer 16 receives the signal corresponding to the misfire state of the burner 1 from the combustion signal generation circuit 17 and detects the misfire of the burner 1, the microcomputer 16 outputs the output signal K,
J applies a low level and a high level voltage signal (valve closing command signal) to the bases of the transistors 38 and 35, respectively. As a result, the transistor 38 is turned off, and the base current of the transistor 36 of the solenoid valve driving circuit 19 stops flowing, so that the transistor 36 is turned off and the transistor 35 of the solenoid valve driving circuit 19 is also turned off. Therefore, the power supply to the solenoid 11 is cut off, the solenoid valve 2 is closed, and the gas supply to the burner 1 is cut off.
In this operation, only one of the transistors 35 and 36 may be turned off.

The operation at the time of misfire is an operation when the microcomputer 16 is operating normally. However, when the microcomputer 16 runs away due to disturbance or the like or breaks down, the microcomputer 16 operates as described above. As a result, the transistors 35, 36, and 38 of the solenoid valve drive circuit 19 are maintained in a conductive state, the energization of the solenoid 11 is maintained, and the solenoid valve 2 may not be closed. .

When the microcomputer 16 runs out of control in this manner, the pulse signal P is not output from the microcomputer 16 to the base of the transistor 21 which supplies power to the combustion signal generating circuit 17 from the power supply circuit 20. Transistor 2
1 may be maintained in the cutoff state, and the combustion signal generation circuit 17 may be inoperable.

However, in the present embodiment, the solenoid valve 2 can be closed when the burner 1 misfires even if the microcomputer 16 runs out of control or fails as described above.

That is, first, when the combustion signal generation circuit 17 is normally started (when the pulse signal P is output from the microcomputer 16 to the transistor 21), the combustion state of the burner 1 of the thermocouple 27 is changed. When the corresponding electromotive voltage becomes a voltage corresponding to the misfire state of the burner 1, the voltage level of the output point H of the comparator 30 of the combustion signal generation circuit 17 becomes high as described above.

Also, when the microcomputer 16 runs out of control as described above and power is not supplied to the combustion signal generation circuit 17 and the combustion signal generation circuit 17 becomes inoperable, the output point H Becomes a high level.

Therefore, when the combustion signal generating circuit 17 is operating and the burner 1 is misfired, and the electromotive voltage of the thermocouple 27 becomes a voltage corresponding to the misfire state of the burner 1, or
When the combustion signal generation circuit 17 becomes inoperable, the voltage at the output point H of the comparator 30 becomes a high-level voltage, and this high-level voltage signal
The signal is input to one input terminal of the ND circuit 39.

At this time, if the solenoid 11 is energized, that is, if the solenoid valve driving circuit 19 is not driven by the microcomputer 16 to cut off the energization of the solenoid 11, the solenoid valve driving circuit Auxiliary circuit 1 from upstream of resistor 34 on the downstream side of 19 transistors 35
A high-level voltage signal is applied to the other input terminal of the NAND circuit 39.

Therefore, the output voltage of the NAND circuit 39 becomes a low level voltage, and this low level voltage is applied to the base of the transistor 40 of the auxiliary circuit 18. As a result, the transistor 40 becomes conductive, and the capacitor 45 is gradually charged via the resistor 44 from the power supply terminal E of the auxiliary circuit 18 to which power is supplied from the power supply circuit 20. At this time, the charging voltage of the capacitor 45 reaches a high level voltage after the elapse of the timer time (40 seconds in this embodiment) determined by the capacitance and the resistance value of the resistor 44, and the voltage is input to the NAND circuit 42. Is done. And the N
By inputting a high-level voltage signal to the AND circuit 42,
The output voltage of the NAND circuit 42 changes from the high level to the low level, and the low level voltage is applied to the base of the transistor 43. Therefore, the transistor 43 is turned off, and accordingly, the transistor 38 of the solenoid valve driving circuit 19 is turned off. When the transistor 38 is turned off, the transistor 3
6 stops flowing, and the transistor 36
Is shut off, whereby the power supply to the solenoid 11 is cut off, and the solenoid valve 2 is closed.

Therefore, the electromotive voltage of the thermocouple 27 becomes a voltage corresponding to the misfire state of the burner 1, and if the voltage continues for the timer time, or the microcomputer 16 runs away or breaks down, the combustion signal generation circuit 17 When power supply is not continued for the timer period, the auxiliary circuit 18 can shut off the power supply to the solenoid 11 via the electromagnetic valve drive circuit 19 to close the electromagnetic valve 2.

When the microcomputer 16 is operating normally and the burner 1 is burning normally, the power supply to the combustion signal generating circuit 17 is intermittently performed as described above. At the output point H of the comparator 30 of the signal generation circuit 17, a low-level voltage signal corresponding to the burn state of the burner 1 and a high-level voltage signal corresponding to the misfire state of the burner 1 appear alternately and periodically. This is input to the NAND circuit 39 of the auxiliary circuit 18. However, the auxiliary circuit 1
Since the timer time of 8 is sufficiently longer than the cycle of supplying power to the combustion signal generation circuit 17 and shutting off the same, a high-level signal corresponding to the misfire state of the burner 1 is output to the output point H of the comparator 30 for a short time. Even if it appears periodically, the auxiliary circuit 18 is not actuated to cut off the power supply to the solenoid by the solenoid valve driving circuit 19 in response thereto, so that the solenoid valve 2 is kept open and the burner 1 Combustion continues without hindrance.

As described above, in the combustion apparatus of this embodiment, the power supply to the combustion signal generation circuit 17 is intermittently performed from the power supply circuit 20 via the transistor 21 so that the combustion signal generation circuit 17 As the power consumption is reduced, the consumption of the battery 15 can be suppressed.
5 can have a relatively long life.

If the burner 1 misfires even if the microcomputer 16 runs out of control or fails, the auxiliary circuit 18
As a result, the power supply to the solenoid 11 can be cut off via the solenoid valve drive circuit 19 to close the solenoid valve 2.

Although a detailed description is omitted in the description of the present embodiment, the microcomputer 16 is connected to the circuit connected to the temperature detector 7, the circuit connected to the power supply circuit 20, and the like. The heating temperature of the food and the voltage VD of the battery 15 are monitored. For example, when the heating temperature of the food becomes abnormally high, the solenoid valve driving circuit is operated in the same manner as in the case of misfire of the burner 1. The solenoid valve 2 is closed via 19 and a warning is issued by a warning lamp or the like (not shown) when the voltage VD of the battery 15 drops and the battery 15 needs to be replaced.

In the embodiment described above, the gas stove is described as an example, but it is needless to say that the present invention can be applied to various combustion devices such as a heater and an oven.

In this embodiment, a gas stove provided with one burner 1 has been described. However, the present invention can be applied to a gas stove provided with a plurality of burners in the same manner as in this embodiment. is there.

In this embodiment, the switching transistor 21 is used as a switching element. However, it is needless to say that a low-current type relay or the like can be used.

[0055]

As is apparent from the above description, according to the present invention, a pulse signal is applied from a microcomputer for controlling a combustion unit to a path for supplying battery power from a power supply circuit to a combustion signal generation circuit. By interposing a switching element that periodically conducts and cuts off, the microcomputer controls the operation of the combustion unit according to the output signal of the combustion signal generation circuit when the switching element is conductive. In addition, the power consumption of the battery can be reduced as much as possible to extend its life. In this case, the microcomputer can output the pulse signal only by performing setting of the program, and the microcomputer originally provided for controlling the combustion unit. Therefore, a new circuit requiring power consumption is not required, and the power consumption of the battery can be minimized with an inexpensive and simple configuration. Also, since the microcomputer itself outputs a pulse signal for intermittently supplying power to the combustion signal generation circuit, the microcomputer determines in real time whether or not power is being supplied to the combustion signal generation circuit. Therefore, when the power is supplied to the combustion signal generation circuit, the required combustion section can be quickly controlled in accordance with the output of the combustion signal generation circuit.

When a signal corresponding to the misfiring state of the combustion section is output from the combustion signal generation circuit, the microcomputer instructs the solenoid valve drive circuit to close the solenoid valve provided in the fuel supply path to the combustion section. When the solenoid valve is closed by the solenoid valve drive circuit by outputting a signal corresponding to the misfire state of the combustion unit from the combustion signal generation circuit for a predetermined time longer than the cycle of the pulse signal, continuously When output, the auxiliary circuit outputs a valve closing command signal of the solenoid valve to the solenoid valve drive circuit, at this time, the combustion signal generation circuit,
Since the output to the auxiliary circuit when the power is not supplied and the output to the auxiliary circuit when the combustion unit is in a misfire state are the same, the microcomputer runs away or breaks down and the combustion signal generation circuit Even when the power supply to the combustion unit is stopped, the solenoid valve can be closed in the event of a misfire in the combustion unit. Blocking can be performed reliably.

[Brief description of the drawings]

FIG. 1 is an explanatory system configuration diagram of an example of a combustion device of the present invention.

FIG. 2 is a circuit configuration diagram of a main part of the combustion device of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Burner (combustion part), 2 ... Solenoid valve, 3 ... Gas supply path (fuel supply path), 15 ... Battery, 16 ... Microcomputer, 17 ... Combustion signal generation circuit, 18 ... Auxiliary circuit, 19
... an electromagnetic valve drive circuit, 20 ... a power supply circuit, 21 ... a switching transistor (switching element).

Claims (2)

(57) [Claims] 1. A combustion signal generation circuit for outputting a signal corresponding to a combustion state of a combustion section using a battery as a power supply, and controlling operation of the combustion section in accordance with an output signal of the combustion signal generation circuit using the battery as a power supply. And a power supply circuit for supplying the battery power to the microcomputer and the combustion signal generation circuit, in a power supply path from the power supply circuit to the combustion signal generation circuit,
A switching element that periodically conducts and shuts off by applying a pulse signal from the microcomputer is provided, and the microcomputer outputs the combustion unit according to an output signal of the combustion signal generation circuit when the switching element is conducting. A combustion device configured to control the operation of a combustion device. 2. A solenoid valve provided in a fuel supply path for supplying fuel to the combustion unit, and a microcomputer which outputs a signal corresponding to a misfire state of the combustion unit from the combustion signal generation circuit. An electromagnetic valve drive circuit that closes the electromagnetic valve by inputting a valve closing command signal of the electromagnetic valve, and a signal corresponding to a misfire state of the combustion unit from the combustion signal generation circuit is shorter than a cycle of the pulse signal. An auxiliary circuit for outputting a valve closing command signal to the electromagnetic valve drive circuit when continuously output for a long predetermined time, wherein the combustion signal generation circuit supplies the auxiliary circuit when the power is not supplied to the auxiliary circuit. 2. The combustion apparatus according to claim 1, wherein an output of the combustion unit and an output of the combustion unit to the auxiliary circuit in a misfire state are the same.