A solenoid valve driving circuit for a gas device, a gas device and an ignition method thereof

Abstract

The present invention discloses a solenoid valve drive circuit for a gas device, a gas device, and an ignition method thereof. The solenoid valve drive circuit for a gas device includes a thermocouple for detecting the fire or fire state of the gas device; a delay control circuit for delaying power supply and shutting off the power supply after a certain period of time, and outputting a pulse through a microcontroller unit to cause the power supply to open the solenoid valve; a signal amplification circuit connected to the thermocouple for controlling the solenoid valve to remain open when the fire is on and to close the solenoid valve when the fire is off. A gas device includes the above-mentioned solenoid valve drive circuit. An ignition method includes: the delay control circuit outputs power to open the solenoid valve; the solenoid valve connects to gas for ignition and combustion; the delay control circuit delays disconnecting the solenoid valve power supply, and the signal amplification circuit and the thermocouple maintain the solenoid valve open when the fire is on and actively close the solenoid valve when the fire is off. The present invention allows the microcontroller unit to participate in control to an appropriate extent, reduces electromagnetic interference, and improves product reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic control of gas devices, and in particular to a gas device electromagnetic valve drive circuit, a gas device and an ignition method thereof. Background Art

[0002] Currently, when the solenoid valve of an existing gas device is opened, the MCU (microcontroller unit) on the main control board can actively open the solenoid valve to ventilate the gas circuit, and manual ignition is performed at this time. After the fire bar is ignited, the thermocouple detects the flame and transmits the signal back to the MCU. After receiving the signal, if the MCU does not receive a signal from the thermocouple within the specified time, it is considered that the fire on the fire bar has not been effectively ignited or has accidentally gone out. At this time, the MCU will actively close the solenoid valve to achieve the purpose of flameout protection. The disadvantage of the existing solenoid valve drive circuit is that the MCU is required to operate the solenoid valve and judge the flame. The MCU will be affected by electromagnetic interference during operation, which can easily cause erroneous operation and lead to accidents such as gas leaks. The requirements for the MCU are relatively high.

[0003] Therefore, for the above problems, it has become a technical problem that needs to be solved urgently. Summary of the Invention

[0004] The purpose of the present invention is to provide a solenoid valve drive circuit for a gas device, a gas device and an ignition method thereof, so as to solve the technical problems in the prior art that the microcontroller unit needs to be fully involved, the cost is high and the device is subject to strong electromagnetic interference.

[0005] To solve the above technical problems, the present invention provides a technical solution: a solenoid valve drive circuit for a gas device, comprising a thermocouple for detecting a fire or no fire state of the gas device;

[0006] The delay control circuit is used to turn off the power supply after a certain period of time after the power is supplied, wherein the micro control unit outputs a pulse so that the power supply turns on the solenoid valve;

[0007] The signal amplifying circuit is connected to the thermocouple to control the solenoid valve to remain open when there is fire and to actively close the solenoid valve when there is no fire.

[0008] The present invention adopts the above technical solution. When power is turned on, the delay control circuit outputs power, and the microcontroller unit outputs pulses at the same time, loading the DC power supply to the coil of the solenoid valve, opening the solenoid valve. After the solenoid valve is opened, the gas device is connected to the gas and ignites and burns. The signal amplification circuit receives and processes the electrical signal fed back by the thermocouple, and outputs a control signal after amplification to control the solenoid valve to remain in the open state, so that the flame continues to burn. When the delay time is met, the delay control circuit disconnects the output power; at this time, the on and off of the solenoid valve is controlled by the signal amplification circuit.

[0009] Furthermore, the signal amplification circuit includes a first dual operational amplifier (U2A) and a second dual operational amplifier (U2B) connected in series, along with a transistor (Q10). The first dual operational amplifier (U2A) is connected to the thermocouple (TE1), and the output of the second dual operational amplifier (U2B) drives transistor (Q10) to turn on. The first and second dual operational amplifiers perform common-phase amplification, outputting electrical signals that control transistor (Q10) to turn on. When transistor (Q10) turns on, it turns on a DC power supply, applying voltage to the solenoid valve.

[0010] Furthermore, the output of the second dual operational amplifier U2B is connected to a resistor R30, which feeds the amplified electrical signal of the thermocouple TE1 back to the microcontroller. The microcontroller receives the feedback signal from the thermocouple and uses it to determine the combustion state of the flame and can display it on the display device.

[0011] Furthermore, the first dual operational amplifier U2A is connected to the thermocouple TE1 via resistors R22 and R24, which function to limit current.

[0012] Furthermore, a negative feedback resistor R27 is connected in parallel between the inverting input terminal and the output terminal of the first dual operational amplifier U2A. The negative feedback resistor R27 is connected in parallel to perform a shunt function, thereby increasing the power of signal transmission.

[0013] Furthermore, a resistor R23 is connected in series to the non-inverting input terminals of the first dual operational amplifier U2A and the second dual operational amplifier U2B.

[0014] Furthermore, a resistor R28 is connected in parallel between the inverting input terminal and the output terminal of the second dual operational amplifier U2B, and the inverting input terminal is grounded via a resistor R29.

[0015] Furthermore, a resistor R25 is connected between the output end of the second dual operational amplifier U2B and the base of the transistor Q10 , and the base and emitter of the transistor Q10 are connected via a resistor R26 and grounded.

[0016] Furthermore, the collector of the transistor Q10 is connected to the gates of the PMOS transistors T6 and T8 through the resistors R70 and R71, respectively, and is connected to the positive electrode of the power supply through the resistor R4. When the transistor Q10 is turned on, the PMOS transistors T6 and T8 are turned on, so that the holding coil M2 of the solenoid valve is powered on.

[0017] Furthermore, the delay control circuit includes a switching diode D1, a first voltage comparator U1A, and a second voltage comparator U1B. The positive input terminals of the first and second voltage comparators U1A and U1B are connected to the positive terminal of the power supply via a voltage divider module, while the negative input terminals are connected to capacitors C1 and C2, respectively. Switching diode D1 is connected to the positive terminal of the power supply via resistors R9 and R10 to capacitors C1 and C2. The high level outputs of the first and second voltage comparators U1A and U1B activate transistors Q7 and Q8, thereby turning on PMOS transistors T1, T2, and T5, thereby powering the solenoid valve. The dual-path delay circuit formed by the first and second voltage comparators provides better output control. By charging capacitors C1 and C2, the voltage at the negative input terminal of the input voltage comparator changes during the charging process, thereby changing the voltage level of the voltage comparator, achieving a time control effect.

[0018] Furthermore, the voltage divider module is composed of a resistor R11 and a resistor R17. The positive input terminals of the first voltage comparator U1A and the second voltage comparator U1B are connected to the positive pole of the power supply after voltage is divided by the resistor R11 and the resistor R17.

[0019] Furthermore, one end of capacitors C1 and C2 is grounded, and the other ends are connected to PMOS transistors T3 and T9, respectively, for releasing the capacitor voltage. The drains of PMOS transistors T3 and T9 are grounded. When the gas device is powered off after operation, the voltage of capacitors C1 and C2 is released, ensuring that the voltage across them is zero when it is next powered on, ensuring accurate timing control.

[0020] Furthermore, the drain of PMOS transistor T1 is connected to the source of PMOS transistor T2, the drain of PMOS transistor T2 is connected to PMOS transistor T4, the source of PMOS transistor T4 is connected to the actuating coil M1 of the solenoid valve, and the gate of PMOS transistor T4 is connected to the signal output terminal of the microcontroller unit. The microcontroller unit outputs a pulse signal to turn on PMOS transistor T4, applying power to the actuating coil M1 of the solenoid valve.

[0021] In order to solve the above technical problem, another technical solution provided by the present invention is: a gas device, comprising the gas device solenoid valve drive circuit described in the above technical solution.

[0022] The gas device further includes a gas pipeline, a nozzle, a fire grate, and a solenoid valve. The solenoid valve is installed on the gas pipeline. The nozzle is installed on the fire grate and connected to the output end of the gas pipeline. The detection end of the thermocouple TE1 is located above the ignition point of the fire grate. The solenoid valve is used to connect the gas pipeline, allowing gas to be delivered to the nozzle and enter the fire grate. The thermocouple is used to detect the burning flame of the fire grate.

[0023] Furthermore, an ignition pin is connected to the fire bar, and the ignition pin circuit is connected to a pulse igniter. When the ignition pin and the pulse igniter are provided, the pulse igniter is used to output an electrical signal to the ignition pin for ignition.

[0024] Furthermore, the micro control unit is connected to a thermistor, which is arranged on one side of the fire grate for detecting the combustion temperature parameters of the fire grate.

[0025] Furthermore, the fire bars, solenoid valves and nozzles are provided in at least two numbers, the fire bars are ignited synchronously through an ignition bridge, and at least two solenoid valves are connected in series to the gas pipeline to control the two nozzles respectively.

[0026] Furthermore, the microcontroller circuit is connected to a driving power supply, and the microcontroller signal is connected to an LED light display. The driving power supply supplies power to the microcontroller, and the LED light display is used to display information such as the combustion status of the gas device and corresponding temperature parameters.

[0027] In order to solve the above technical problems, the present invention further provides a technical solution: a method for igniting a gas device, comprising the following steps:

[0028] The delay control circuit outputs power to the solenoid valve, and at the same time the microcontroller unit outputs a pulse signal to cause the power supply to open the solenoid valve;

[0029] The solenoid valve connects the gas to the gas device for ignition and combustion;

[0030] The delay control circuit delays disconnection of the power supply, and the signal amplification circuit is connected to a thermocouple for detecting the fire and no-fire states of the gas device, and controls the solenoid valve to maintain the solenoid valve open when the gas device is in the fire state and actively close the solenoid valve when the gas device is in the no-fire state.

[0031] Among them, the ignition of the gas device includes using a pulse igniter to send an ignition signal to the ignition needle to complete ignition and manual ignition.

[0032] The beneficial effects achieved by the present invention are as follows: a time delay control circuit and a signal amplification circuit are respectively used for time control during ignition and flame control after ignition; during the combustion operation of the gas device, a signal amplification circuit and a thermocouple are used for real-time monitoring and timely response, which has the effect of flameout protection; the combustion temperature of the flame is detected by a thermistor, and the microcontroller unit can display the combustion status and temperature of the flame of the gas device through an LED light display, thereby reducing the full participation of the microcontroller unit, reducing the influence of electromagnetic interference on the microcontroller unit, maintaining the reliability of the action, and reducing the requirements and cost of the microcontroller unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic structural diagram of an embodiment of a solenoid valve drive circuit for a gas device according to the present invention;

[0034] Figure 2 1 is a schematic diagram of the circuit structure of the signal amplifying circuit of the present invention;

[0035] Figure 3 1 is a schematic diagram of the circuit structure of the delay control circuit of the present invention;

[0036] Figure 4 A schematic diagram of the circuit structure of a solenoid valve driving circuit of a gas device according to the present invention;

[0037] Figure 5 This is a system structure block diagram of a gas device of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 、 Figure 2 and Figure 3 As shown, a gas device solenoid valve drive circuit includes

[0040] Thermocouple TE1, used to detect the fire or no fire status of the gas device;

[0041] The delay control circuit 20 delays the power supply for a period of time after providing the power supply and then turns off the power supply. The micro control unit 1 outputs a pulse so that the power supply turns on the solenoid valve 30.

[0042] The signal amplifying circuit 10 is connected to the thermocouple TE1 and is used to control the solenoid valve 30 to remain open when there is a fire and to actively close the solenoid valve 30 when there is no fire.

[0043] Thermocouple TE1 detects that the gas device is burning when it is in a state of flame, while thermocouple TE1 detects that the gas device is not burning when it is in a state of flame extinction. Extinction occurs when the flame of a gas device unexpectedly goes out during the combustion process. The present invention detects the flame state of the gas device. When the flame goes out, the signal amplification circuit 10 receives and processes the signal generated by the thermocouple TE1, and outputs a control signal to control the solenoid valve 30 to remain open or closed, thereby providing flameout protection.

[0044] The signal amplifying circuit 10 includes a first dual operational amplifier U2A and a second dual operational amplifier U2B connected in series and a transistor Q10. The first dual operational amplifier U2A is connected to the thermocouple TE1. The output end of the second dual operational amplifier U2B drives the transistor Q10 to turn on.

[0045] The output end of the second dual operational amplifier U2B is connected to a resistor R30 , which feeds back the amplified electrical signal of the thermocouple TE1 to the micro control unit 1 .

[0046] The first dual operational amplifier U2A is connected to the thermocouple TE1 via resistors R22 and R24.

[0047] A negative feedback resistor R27 is connected in parallel between the inverting input terminal and the output terminal of the first dual operational amplifier U2A.

[0048] A resistor R23 is connected in series to the non-inverting input terminals of the first dual operational amplifier U2A and the second dual operational amplifier U2B.

[0049] A resistor R28 is connected in parallel between the inverting input terminal and the output terminal of the second dual operational amplifier U2B, and the inverting input terminal is grounded via a resistor R29.

[0050] A resistor R25 is connected between the output end of the second dual operational amplifier U2B and the base of the transistor Q10 . The base and emitter of the transistor Q10 are connected to ground via a resistor R26 .

[0051] The collector of transistor Q10 is connected to the gates of PMOS transistors T6 and T8 through resistors R70 and R71, respectively, and is also connected to the positive electrode of the power supply through resistor R4. When transistor Q10 is turned on, PMOS transistors T6 and T8 are turned on, so that the holding coil M2 of the solenoid valve 30 is powered.

[0052] The delay control circuit 20 includes a switching diode D1, a first voltage comparator U1A and a second voltage comparator U1B. The positive input terminals of the first voltage comparator U1A and the second voltage comparator U1B are connected to the positive pole of the power supply through a voltage divider module, and the negative input terminals are connected to capacitors C1 and C2 respectively. The switching diode D1 is connected to the positive pole of the power supply and is connected to capacitors C1 and C2 through resistors R9 and R10. The first voltage comparator U1A and the second voltage comparator U1B output a high level to turn on transistors Q7 and Q8, so as to turn on PMOS transistors T1, T2 and T5 to input the starting voltage into the solenoid valve 30.

[0053] The voltage divider module is composed of a resistor R11 and a resistor R17. The positive input terminals of the first voltage comparator U1A and the second voltage comparator U1B are connected to the positive terminal of the power supply after voltage is divided by the resistors R11 and R17.

[0054] One end of the capacitor C1 and the capacitor C2 is grounded, and the other ends are respectively connected to a PMOS transistor T3 and a PMOS transistor T9 for releasing the capacitor voltage. The drains of the PMOS transistor T3 and the PMOS transistor T9 are grounded.

[0055] The drain of the PMOS transistor T1 is connected to the source of the PMOS transistor T2, the drain line of the PMOS transistor T2 is connected to the PMOS transistor T4, the source of the PMOS transistor T4 is connected to the actuating coil M1 of the solenoid valve 30, and the gate of the PMOS transistor T4 is connected to the signal output end of the micro control unit 1.

[0056] Reference Figures 1 to 5 As shown, the present invention discloses a gas device including the solenoid valve drive circuit described in the above embodiment. The gas device includes a gas pipeline 41, a nozzle 42, a flame block 43, and a solenoid valve 30. The solenoid valve 30 is provided on the gas pipeline 41. The nozzle 42 is provided on the flame block 43 and connected to the output end of the gas pipeline 41. The detection end of the thermocouple TE1 is located above the ignition point of the flame block 43.

[0057] The fire bar 43 is connected to an ignition pin 44 , which is connected to a pulse igniter 45 .

[0058] The microcontroller unit 1 is connected to a thermistor 46, which is located on one side of the fire grate 43 and is used to detect the combustion temperature parameters of the fire grate 43. At least two fire grate 43, solenoid valves 30, and nozzles 42 are provided. The fire grate 43 is synchronized for ignition via a pilot bridge 47. At least two solenoid valves 30 are connected in series to the gas pipeline 41, respectively controlling two nozzles 42.

[0059] The micro control unit 1 is connected to a driving power supply 40 , and the micro control unit 1 is connected to an LED light display screen 48 via a signal.

[0060] In this embodiment, the delay control circuit 20 , the signal amplifying circuit 10 , and the micro control unit 1 may be integrated into the printed circuit board 2 .

[0061] When multiple fire bars are used, ignition is achieved through a pilot bridge 47, and gas flow is controlled on and off by multiple solenoid valves 30 and nozzles 42, achieving temperature regulation. In the present invention, the microcontroller unit 1 is signal-connected to a switch knob 49 for manual operation and control of the combustion state of the gas device. The microcontroller unit 1 is also signal-connected to an LED display screen 48 for displaying relevant information.

[0062] In the specific implementation of the present invention, the delay control circuit 20 outputs a 3V starting voltage to start the actuating coil M1 of the solenoid valve 30. At the same time, the micro control unit 1 outputs a pulse signal, which starts the PMOS tube T4 to control the solenoid valve 30 to open, thereby achieving the purpose of opening the valve.

[0063] Specifically, upon power-up, resistors R11 and R17 form a voltage divider module, shunting the incoming DC power to provide a 2.2V reference voltage for the positive input terminals of the first and second voltage comparators U1A and U1B. The voltage across capacitors C1 and C2 is zero, and the voltage input to the negative input terminals of the voltage comparators is zero. The first and second voltage comparators U1A and U1B output a high level, driving transistors Q7 and Q8 to conduct, turning on PMOS transistors T1, T2, and T5. Simultaneously, microcontroller unit 1 outputs a 1S low-level pulse, turning on PMOS transistor T4, connecting power to the actuating coil M1 of solenoid valve 30 and opening solenoid valve 30. Solenoid valve 30 then conducts gas to the gas burner of the gas appliance for ignition.

[0064] The input DC power supply voltage charges capacitors C1 and C2 through resistors R9 and R10. During the charging process, when the voltages of capacitors C1 and C2 are greater than or equal to 2.2V, the voltages of the negative input terminals of the first voltage comparator U1A and the second voltage comparator U1B are greater than or equal to the positive input terminals, causing the first and second voltage comparators U1A and U2B to output a low level. At this time, transistors Q7 and Q8 are turned off, causing PMOS transistors T1, T2, T4, and T5 to be turned off. When the delay time expires, the circuit disconnects the power supply of the solenoid valve 30.

[0065] Solenoid valve 30 conducts gas to fire grate 43, and pulse igniter 45 emits a pulse, igniting the gas through ignition pin 44. After the gas ignites, the burning flame causes thermocouple TE1 to output an electromotive force signal. This signal is then processed by first dual operational amplifier U2A, which is connected in parallel with negative feedback resistor R27. First dual operational amplifier U2A amplifies the signal and feeds it to second dual operational amplifier U2B for further amplification. The amplified signal output by second dual operational amplifier U2B turns on transistor Q10, turning on transistor Q10, PMOS transistors T6, and PMOS transistors T8. This in turn transmits the DC power supply voltage to the hold coil M2 of solenoid valve 30, which maintains the solenoid valve open.

[0066] When the gas device is extinguished, the electromotive force output by the thermocouple TE1 is 0, and the second dual operational amplifier U2B outputs an electrical signal to control the transistor Q10, PMOS tube T6 and PMOS tube T8 to be cut off, so that the holding coil M2 of the solenoid valve 30 loses power and is disconnected, closing the solenoid valve, thereby playing the role of flameout protection.

[0067] When powered on, the delay control circuit 20 actively turns on the PMOS transistors T1 and T2 to provide power to the solenoid valve 30, which opens the solenoid valve 30. After a delay of a period (e.g., 20 seconds), the power is turned off. The solenoid valve 30 maintains its open state under the combined action of the thermocouple TE1 (which outputs an electromotive force of approximately 2-3 mV) and the signal amplification circuit 20. The thermocouple TE1 and the signal amplification circuit 10 can only maintain the solenoid valve 30 in the open state and cannot open the solenoid valve 30 when it is closed. When the thermocouple TE1 is not in the flameout state, the electromotive force output by the thermocouple TE1 is less than 1 mV. At this time, the signal amplification circuit 10 cannot maintain the open state of the solenoid valve 30, and thus actively closes the solenoid valve, thereby extinguishing the flameout. This ensures that the delay control circuit 20 and the signal amplification circuit 10 reliably implement the flameout protection function without the involvement of the microcontroller unit 1.

[0068] When the DC power supply voltage is cut off, the voltage across capacitors C1 and C2 is greater than zero, causing PMOS transistors T3 and T9 to be turned on, and the capacitors to be grounded, which is used to release the voltage across capacitors C1 and C2. This allows the voltage across capacitors C1 and C2 to be zero when the circuit is powered on next time, thereby ensuring the accuracy of time control.

[0069] The present invention also discloses a method for igniting a gas device, comprising the following steps:

[0070] The delay control circuit 20 outputs power to the solenoid valve 30, and at the same time the micro control unit 1 outputs a pulse signal to enable the power supply to open the solenoid valve 30;

[0071] The electromagnetic valve 30 connects the gas to the gas device for ignition and combustion;

[0072] The delay control circuit 20 delays disconnection of the power supply, and the signal amplification circuit 10 is connected to a thermocouple for detecting the fire and no-fire states of the gas device, and controls the solenoid valve 30 to maintain the solenoid valve 30 open when the gas device is in the fire state and actively close the solenoid valve 30 when the gas device is in the no-fire state.

[0073] The ignition of the gas device includes using a pulse igniter 45 to send an ignition signal to the ignition needle 44 to complete the ignition and manual ignition.

[0074] It should be understood that the gas device of the present invention can be applied to gas stoves, household gas stoves, ovens and other equipment during specific use to achieve control of the solenoid valve and reduce the cost and requirements of the microcontroller unit MCU.

[0075] In summary, the present invention has been made into actual samples and tested for multiple uses as described in the specification and the illustrations. From the results of the use tests, it can be proved that the present invention can achieve its intended purpose and its practical value is beyond doubt. The above embodiments are only used to illustrate the present invention and are not intended to limit the present invention in any form. Any person with ordinary knowledge in the technical field can, without departing from the scope of the technical features of the present invention, make equivalent embodiments by making partial changes or modifications to the technical content disclosed by the present invention and without departing from the technical features of the present invention, and all of them still fall within the scope of the technical features of the present invention.

Claims

1. A solenoid valve drive circuit for a gas device, characterized in that: include Thermocouples are used to detect the presence or absence of fire in gas appliances; A delay control circuit (20) turns off the power supply after a delay period of time after supplying the power supply, wherein a pulse is outputted by the micro control unit (1) so that the power supply opens the electromagnetic valve (30); A signal amplifying circuit (10) is connected to the thermocouple and is used to control the solenoid valve (30) to remain open when there is a fire and to actively close the solenoid valve (30) when there is no fire; The delay control circuit (20) includes a switching diode D1, a first voltage comparator U1A, and a second voltage comparator U1B. The positive input terminals of the first voltage comparator U1A and the second voltage comparator U1B are connected to the positive electrode of the power supply through a voltage divider module, and the negative input terminals are connected to capacitors C1 and C2 respectively. The switching diode D1 is connected to the positive electrode of the power supply and is connected to capacitors C1 and C2 through resistors R9 and R10. The first voltage comparator U1A and the second voltage comparator U1B output a high level for turning on transistors Q7 and Q8, so as to turn on PMOS transistors T1, T2, and T5, thereby turning on the solenoid valve (30). The signal amplification circuit (10) comprises a first dual operational amplifier U2A and a second dual operational amplifier U2B connected in series and a transistor Q10, wherein the first dual operational amplifier U2A is connected to the thermocouple, and the output end of the second dual operational amplifier U2B drives the transistor Q10 to turn on; The first dual operational amplifier U2A is connected to the thermocouple via resistors R22 and R24; A negative feedback resistor R27 is connected in parallel between the inverting input terminal and the output terminal of the first dual operational amplifier U2A; A resistor R23 is connected in series to the non-inverting input terminals of the first dual operational amplifier U2A and the second dual operational amplifier U2B.

2. The solenoid valve driving circuit of a gas device according to claim 1, characterized in that: The output end of the second dual operational amplifier U2B is connected to a resistor R30, which feeds back the amplified electrical signal of the thermocouple TE1 to the micro control unit (1).

3. The solenoid valve driving circuit of a gas device according to claim 1, characterized in that: A resistor R28 is connected in parallel between the inverting input terminal and the output terminal of the second dual operational amplifier U2B, and the inverting input terminal is grounded via a resistor R29.

4. The solenoid valve driving circuit of a gas device according to claim 1, characterized in that: A resistor R25 is connected between the output end of the second dual operational amplifier U2B and the base of the transistor Q10 . The base and emitter of the transistor Q10 are connected to ground via a resistor R26 .

5. The solenoid valve driving circuit of a gas device according to claim 4, characterized in that: The collector of the transistor Q10 is connected to the gates of the PMOS transistor T6 and the PMOS transistor T8 through resistors R70 and R71 respectively, and is connected to the positive electrode of the power supply through resistor R4. When the transistor Q10 is turned on, the PMOS transistor T6 and the PMOS transistor T8 are turned on, so that the maintenance coil M2 of the electromagnetic valve (30) is connected to the power supply.

6. The solenoid valve driving circuit of a gas device according to claim 1, characterized in that: The voltage divider module is composed of a resistor R11 and a resistor R17. The positive input terminals of the first voltage comparator U1A and the second voltage comparator U1B are connected to the positive pole of the power supply after voltage is divided by the resistors R11 and R17.

7. The solenoid valve driving circuit of a gas device according to claim 1, characterized in that: One end of the capacitor C1 and the capacitor C2 are grounded, and the other ends are connected to a PMOS transistor T3 and a PMOS transistor T9 for releasing the capacitor voltage. The drains of the PMOS transistor T3 and the PMOS transistor T9 are grounded.

8. The solenoid valve driving circuit of a gas device according to claim 1, characterized in that: The drain of the PMOS tube T1 is connected to the source of the PMOS tube T2, the drain line of the PMOS tube T2 is connected to the PMOS tube T4, the source of the PMOS tube T4 is connected to the action coil M1 of the electromagnetic valve (30), and the gate of the PMOS tube T4 is connected to the signal output end of the micro control unit (1).

9. A gas device, characterized in that: The invention comprises a solenoid valve driving circuit for a gas device according to any one of claims 1 to 8.

10. The gas device according to claim 9, characterized in that: The gas device comprises a gas pipeline (41), a nozzle (42), a fire grate (43) and a solenoid valve (30). The solenoid valve (30) is arranged on the gas pipeline (41), the nozzle (42) is arranged on the fire grate (43) and connected to the output end of the gas pipeline (41), and the detection end of the thermocouple is located above the ignition point of the fire grate (43).

11. The gas device according to claim 10, characterized in that: The fire bar (43) is connected to an ignition pin (44), and the ignition pin (44) is connected to a pulse igniter (45).

12. The gas device according to claim 10, characterized in that: The microcontrol unit (1) is connected to a thermistor (46), which is arranged on one side of the fire grate (43) and is used to detect the combustion temperature parameters of the fire grate (43).

13. The gas device according to claim 11, characterized in that: The fire bars (43), electromagnetic valves (30) and nozzles (42) are provided in at least two configurations, the fire bars (43) are ignited synchronously via an ignition bridge (47), and at least two electromagnetic valves (30) are connected in series to the gas pipeline (41) to control the two nozzles (42) respectively.

14. The gas device according to claim 10, characterized in that: The micro control unit (1) is connected to a driving power supply (40) via a circuit, and the micro control unit (1) is signal-connected to an LED light display screen (48).

15. A method for igniting a gas device, characterized in that: The method is applied to the gas device according to any one of claims 9 to 14, comprising the following steps: The delay control circuit (20) outputs power to the solenoid valve (30), and at the same time the micro control unit (1) outputs a pulse signal so that the power opens the solenoid valve (30); The electromagnetic valve (30) connects the gas to the gas device for ignition and combustion; The time delay control circuit (20) delays disconnection of the power supply, and the signal amplifying circuit (10) is connected to a thermocouple for detecting the fire and no-fire states of the gas device, and controls the solenoid valve (30) to maintain the solenoid valve (30) open when the gas device is in the fire state and actively close the solenoid valve (30) when the gas device is in the no-fire state.

16. The ignition method according to claim 15, characterized in that: Ignition of the gas device includes using a pulse igniter (45) to send an ignition signal to an ignition needle (44) to complete ignition and manual ignition.

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