Ignition circuit of thermocouple valve and furnace end

Abstract

The ignition circuit comprises the thermocouple valve, the control end of the thermocouple valve is connected with an electromagnetic coil, and the power supply end of the thermocouple valve is connected with an external power supply; one end of the pull-in control circuit is grounded, and the other end of the pull-in control circuit is connected with the control end of the thermocouple valve through the electromagnetic coil; the anode of the diode is connected with the control end of the thermocouple valve through the electromagnetic coil, and the cathode of the diode is connected with the power supply end of the thermocouple valve; the first input end of the detection circuit is connected to the position between the pull-in control circuit and the electromagnetic coil, and the second input end of the detection circuit is connected to the position between the thermocouple valve and an external power supply; and the CPU is connected with the output end of the detection circuit. The structure is simple, the ignition time can be controlled, the effect of a power source is reduced, and meanwhile the ignition success rate can be effectively increased.

Description

Technical Field

[0001] The utility model relates to the technical field of household appliances, in particular to an ignition circuit and a burner head of a thermocouple valve. Background Art

[0002] The anti-flameout protection of the thermocouple valve 1 is very common in cookers. In the early stage, a hand-pressing method is adopted to ensure that the valve sucks during the initial combustion stage. After the thermocouple generates current to maintain the valve, the valve automatically drops when the flame goes out. During the valve-maintaining period, no power supply is required, and the battery has a long service life. However, during the ignition stage, the knob needs to be pressed, which brings inconvenience to use.

[0003] In the prior art, most of them maintain the suction of the valve during the ignition stage by battery power supply, which solves the inconvenience of using the thermocouple valve 1. However, new problems are brought at the same time. One is that the battery sucks the valve for a long time and has a large current, resulting in the service life of the battery being shortened by more than half. The other is that when the battery is used in the later stage, the internal resistance becomes larger, and the battery energy cannot ignite and maintain the valve at the same time. The existing circuit cannot maintain the valve and can only ignite. When the battery is in a low-power state, it returns to the state before improvement. Therefore, an improved circuit is proposed to solve the above problems. Summary of the Invention

[0004] The utility model aims to solve at least one of the problems existing in the related art to a certain extent. For this purpose, the utility model provides an ignition circuit of a thermocouple valve, which has a simple structure, can make the ignition time controllable, reduce the power consumption of the power supply, and effectively increase the ignition success rate at the same time.

[0005] Secondly, the utility model also provides a burner head, which has a simple structure and can effectively reduce the production cost of the product.

[0006] The above first object is achieved by the following technical solutions:

[0007] An ignition circuit of a thermocouple valve, comprising:

[0008] A thermocouple valve, the control end of which is connected with an electromagnetic coil, and the power supply end of which is connected with an external power supply;

[0009] A suction control circuit, one end of which is grounded, and the other end of which is connected with the control end of the thermocouple valve through the electromagnetic coil;

[0010] A diode, the positive electrode of which is connected with the control end of the thermocouple valve through the electromagnetic coil, and the negative electrode of which is connected with the power supply end of the thermocouple valve;

[0011] A detection circuit, the first input end of which is connected to the position between the suction control circuit and the electromagnetic coil, and the second input end of which is connected to the position between the thermocouple valve and the external power supply;

[0012] A CPU, and the CPU is connected to the output end of the detection circuit.

[0013] In some embodiments, the suction control circuit includes a MOS transistor. The source electrode of the MOS transistor is connected to the electromagnetic coil, its gate electrode is connected to the CPU, and its drain electrode is grounded.

[0014] In some embodiments, the suction control circuit further includes a first resistor. One end of the first resistor is connected to the gate electrode of the MOS transistor, and the other end is connected to the CPU.

[0015] In some embodiments, the suction control circuit further includes a second resistor. One end of the second resistor is connected to the gate electrode of the MOS transistor, and the other end is grounded.

[0016] In some embodiments, the detection circuit includes an operational amplifier. The first input end of the operational amplifier is connected to a position between the suction control circuit and the electromagnetic coil, its second input end is connected to a position between the thermocouple valve and an external power supply, its output end is connected to the CPU, its power supply end is connected to the external power supply, and its grounding end is grounded.

[0017] In some embodiments, the detection circuit further includes a third resistor and a fourth resistor. One end of the third resistor is connected to the first input end of the operational amplifier, and the other end is connected to a position between the suction control circuit and the electromagnetic coil. One end of the fourth resistor is connected to the second input end of the operational amplifier, and the other end is connected to a position between the thermocouple valve and the external power supply.

[0018] In some embodiments, the detection circuit further includes a fifth resistor. One end of the fifth resistor is connected to the first input end of the operational amplifier, and the other end is connected to the CPU.

[0019] In some embodiments, the detection circuit further includes a sixth resistor. One end of the sixth resistor is connected to the second input end, and the other end is grounded.

[0020] The above second object is achieved by the following technical solution:

[0021] A burner head includes an ignition circuit of a thermocouple valve as described in any one of the above embodiments.

[0022] Compared with the prior art, the present utility model at least includes the following beneficial effects:

[0023] 1. The ignition circuit of the thermocouple valve of the present utility model has a simple structure, can make the ignition time controllable, reduces the power consumption of the power supply, and at the same time can effectively increase the ignition success rate.

[0024] 2. The ignition control method of the thermocouple valve of the present utility model is simple and feasible, which can effectively improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic circuit diagram of the ignition circuit in Embodiment 1 of the present utility model;

[0027] Figure 2 It is a schematic flow diagram of the ignition control method in Embodiment 2 of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] To make the objectives, technical solutions, and advantages of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model can be arranged and designed in various different configurations.

[0029] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents the selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of the technical solutions claimed by the present utility model.

[0030] Embodiment 1:

[0031] As Figure 1 shown, this embodiment provides an ignition circuit for a thermocouple valve, including:

[0032] A thermocouple valve 1, the control end of the thermocouple valve 1 is connected with an electromagnetic coil L1, and its power supply end is connected with an external power supply;

[0033] An attraction control circuit 2, one end of the attraction control circuit 2 is grounded, and the other end is connected with the control end of the thermocouple valve 1 through the electromagnetic coil L1;

[0034] A diode D1, the positive pole of the diode D1 is connected with the control end of the thermocouple valve 1 through the electromagnetic coil L1, and its negative pole is connected with the power supply end of the thermocouple valve 1;

[0035] The detection circuit 3, the first input terminal of the detection circuit 3 is connected to the position between the suction control circuit 2 and the electromagnetic coil L1, and its second input terminal is connected to the position between the thermocouple valve 1 and the external power supply;

[0036] The CPU, the CPU is connected to the output terminal of the detection circuit 3.

[0037] In this embodiment, the ignition circuit of the thermocouple valve is preferably applied to the burner of the stove head. Since the control end of the thermocouple valve 1 is connected with the electromagnetic coil L1, and its power supply end is connected to the external power supply to supply power to the thermocouple valve 1 by the external power supply. One end of the suction control circuit 2 is grounded, and the other end is connected to the control end of the thermocouple valve 1 through the electromagnetic coil L1. The positive electrode of the diode D1 is connected to the position between the electromagnetic coil L1 and the suction control circuit 2, and its negative electrode is connected to the power supply end of the thermocouple valve 1, that is, the negative electrode of the diode D1 is connected to the position between the power supply end of the thermocouple valve 1 and the external power supply. In this way, the CPU can generate PWM control through the coordinated action of the suction control circuit 2, the diode D1 and the electromagnetic coil L1, so as to control the conduction or closing of the suction control circuit 2 through PWM adjustment, and further keep the current output of the thermocouple valve 1 constant. Due to the continuous PWM adjustment during ignition, the thermocouple valve 1 is sucked during ignition, so as to realize the function of maintaining valve suction. In addition, the first input terminal of the detection circuit 3 is connected to the position between the suction control circuit 2 and the electromagnetic coil L1, and its second input terminal is connected to the position between the thermocouple valve 1 and the external power supply. Through the action of the detection circuit 3, the detection work such as whether the ignition is successful, judging valve maintenance, valve line failure, flameout, etc. can be realized. Its structure is simple, the ignition time can be controlled, the power efficiency of the power supply is reduced, and at the same time, the ignition success rate can be effectively increased.

[0038] Further, the suction control circuit 2 includes an MOS transistor Q1. The source electrode of the MOS transistor Q1 is connected to the electromagnetic coil L1, its gate electrode is connected to the CPU, and its drain electrode is grounded.

[0039] Preferably, the suction control circuit 2 further includes a first resistor R1. One end of the first resistor R1 is connected to the gate electrode of the MOS transistor Q1, and the other end is connected to the CPU.

[0040] Specifically, the suction control circuit 2 further includes a second resistor R2. One end of the second resistor R2 is connected to the gate electrode of the MOS transistor Q1, and the other end is grounded.

[0041] In this embodiment, the source of MOS transistor Q1 is connected to the control terminal of the thermocouple valve 1 through the electromagnetic coil L1, its gate is connected to the CPU through the first resistor R1, and its drain is grounded. At the same time, one end of the second resistor R2 is connected to the gate of the MOS transistor Q1, that is, one end of the second resistor R2 is connected to the position between the gate of the MOS transistor Q1 and the first resistor R1, and the other end of the second resistor R2 is grounded. When the detection knob switch is switched to the open state to enter the ignition mode, the voltage value of the external power supply and the output voltage value of the operational amplifier U1 are collected. According to the collected information and circuit parameters, calculations are performed through calculation formulas to obtain the PWM initial value, thereby generating PWM control. The PWM pulse controls the conduction or cut-off of the MOS transistor Q1. If it is at a high level, the MOS transistor Q1 is controlled to conduct. If it is at a low level, the MOS transistor Q1 is controlled to cut off, that is, when it is at a low level, the MOS transistor Q1 cuts off the circuit. Specifically, when the MOS transistor Q1 is turned on, the current value of the electromagnetic coil L1 gradually increases and stores energy. Since the thermocouple valve 1 and the electromagnetic coil L1 are connected in series, the thermocouple valve 1 generates a current to maintain the valve suction, thereby keeping the valve gas conduction. When the MOS transistor Q1 is turned off, the electromagnetic coil L1 generates a back electromotive force, and forms a discharge loop through the diode D1. This current keeps the valve current continuous and constant. Due to the continuous PWM regulation during ignition, the thermocouple valve 1 is sucked during ignition, achieving the function of maintaining the valve suction.

[0042] Preferably, the detection circuit 3 includes an operational amplifier U1. The first input terminal of the operational amplifier U1 is connected to the position between the suction control circuit 2 and the electromagnetic coil L1, its second input terminal is connected to the position between the thermocouple valve 1 and the external power supply, its output terminal is connected to the CPU, its power supply terminal is connected to the external power supply, and its ground terminal is grounded.

[0043] Further, the detection circuit 3 further includes a third resistor R6 and a fourth resistor R5. One end of the third resistor R6 is connected to the first input terminal of the operational amplifier U1, and the other end is connected to the position between the suction control circuit 2 and the electromagnetic coil L1. One end of the fourth resistor R5 is connected to the second input terminal of the operational amplifier U1, and the other end is connected to the position between the thermocouple valve 1 and the external power supply.

[0044] Specifically, the detection circuit 3 further includes a fifth resistor R8. One end of the fifth resistor R8 is connected to the first input terminal of the operational amplifier U1, and the other end is connected to the CPU.

[0045] Particularly, the detection circuit 3 further includes a sixth resistor R7. One end of the sixth resistor R7 is connected to the second input terminal, and the other end is grounded.

[0046] In this embodiment, the first input terminal of the operational amplifier U1 is respectively connected to the third resistor R6 and the fifth resistor R8. One end of the third resistor R6 away from the operational amplifier U1 is connected to the position between the source electrode of the MOS transistor Q1 and the electromagnetic coil L1. One end of the fifth resistor R8 away from the operational amplifier U1 is respectively connected to the output terminal of the operational amplifier U1 and the CPU. The second input terminal of the operational amplifier U1 is respectively connected to the fourth resistor R5 and the sixth resistor R7. One end of the fourth resistor R5 away from the operational amplifier U1 is connected to the position between the thermocouple valve 1 and the external power supply. One end of the sixth resistor R7 away from the operational amplifier U1 is grounded. At the same time, the output terminal of the operational amplifier U1 is connected to the CPU, its power supply terminal is connected to the external power supply, and its grounding terminal is grounded. By comparing the amplified signal output by the operational amplifier U1, an output voltage change is generated. According to the amplitude value of whether the output voltage changes, detections such as whether the ignition is successful, valve maintenance, valve circuit failure, and flameout are realized.

[0047] Preferably, since the operational amplifier U1 is a differential amplifier, when there is no ignition and the PWM is in the off period, the current values of the electromagnetic coil L1 and the thermocouple valve 1 are zero, so the voltage values on the electromagnetic coil L1 and the thermocouple valve 1 are also zero. When the PWM control is generated, the current values of the electromagnetic coil L1 and the thermocouple valve 1 are not zero when there is no fault. By comparing the output of the amplifier to generate an amplified signal, an output voltage change is generated. According to the amplitude value of whether the output changes, it is determined whether the circuit has a fault.

[0048] Next, since the amplitude value of the operational amplifier U1 is related to the voltage values of the electromagnetic coil L1 and the thermocouple valve, and the voltage value of the operational amplifier U1 is related to the constant current value, the output voltage of the operational amplifier U1 is proportional to the current value of the thermocouple valve 1. By calculating the initial value of the PWM, if the valve maintenance current is too large, the PWM is adjusted downwards; if the valve maintenance current is too small, the PWM is adjusted upwards; when the current is appropriate, the PWM is fixed. When the PWM control is determined, the voltage value V0 of the operational amplifier U1 is saved. At this time, because of ignition combustion, the thermocouple valve 1 generates an electromotive force, which is superimposed on the thermocouple valve 1 and amplified by the operational amplifier. At this time, the output voltage value of the operational amplifier U1 becomes larger. By continuously detecting the output voltage value of the operational amplifier U1 multiple times and calculating the average value of the obtained data to obtain the voltage value V1, when the difference between the voltage value V1 and the voltage value V0 is greater than the stop ignition threshold, it is determined that the ignition is successful, and the discharge ignition can be stopped.

[0049] Secondly, after stable combustion for a period of time, the high temperature further increases the electromotive force of the thermocouple valve 1. By further increasing the output voltage value of the operational amplifier U1, the output voltage value of the operational amplifier U1 is continuously detected multiple times, and the obtained data is averaged to obtain the voltage value V2. When the difference between the voltage value V2 and the voltage value V0 is greater than the maintenance threshold, it is determined that the electromotive force can stably maintain the valve suction. Then, the PWM output is turned off, that is, the PWM regulation of the CPU is stopped to enable the thermocouple valve 1 to continue to work in the current state, thus completing the zero-second valve-suction function.

[0050] In addition, after the PWM output is stopped, the current value of the electromagnetic coil L1 becomes smaller, and the thermocouple valve 1 generates an electromotive force to increase the voltage input of the operational amplifier U1. At this time, the output voltage value of the operational amplifier U1 is smaller. After the flameout, the thermocouple valve 1 cools down, the electromotive force becomes smaller, and the output voltage of the operational amplifier U1 also becomes smaller. The output voltage value of the operational amplifier U1 is continuously detected multiple times, and the obtained data is averaged to obtain the voltage value V3. When the voltage value V3 is less than the flameout threshold, it is determined that the current burner head has flameout. At this time, an alarm can be issued or the valve can be actively closed. Of course, the thermocouple valve 1 can also be cooled, and the thermocouple valve 1 cannot be maintained due to too small current to achieve valve closing. More preferably, when using a push-button ignition circuit after flameout, if the knob needs to be closed, a micro switch must be added. In this embodiment, after adding the detection circuit 3, the power supply can be actively turned off after identifying valve closing and flameout, simplifying the design, thus avoiding maintaining the working current after turning off the fire.

[0051] Embodiment 2:

[0052] As Figure 2 shown, this embodiment provides an ignition control method for a thermocouple valve, which is applied to a burner head. The burner head applies the ignition circuit as in Embodiment 1, so that the ignition time of the burner head can be controlled, the power consumption of the power supply is reduced, and at the same time, the ignition success rate can be effectively increased. Therefore, the ignition control method in this embodiment is simple and feasible, and can effectively improve the user experience.

[0053] The ignition control method in this embodiment includes the following steps:

[0054] Step S101, after the burner head is ignited.

[0055] Step S102, collect the voltage value of the external power supply and the output voltage value of the operational amplifier U1, and calculate according to the collected information through a calculation formula to obtain the PWM initial value.

[0056] Step S103, adjust the PWM signal output by the CPU according to the PWM initial value so that the holding current of the thermocouple valve 1 is greater than the minimum suction current value.

[0057] In this embodiment, after the detection knob switch is switched to the on state to enter the ignition mode, the voltage value of the external power supply and the output voltage value of the operational amplifier U1 are collected. According to the collected information and circuit parameters, calculations are performed through calculation formulas to obtain the initial PWM value, thereby generating PWM control. The PWM pulse controls the conduction or cut-off of the MOS transistor Q1. When it is at a high level, the MOS transistor Q1 is controlled to conduct, and when it is at a low level, the MOS transistor Q1 is controlled to cut off, that is, when it is at a low level, the MOS transistor Q1 cuts off the circuit. Specifically, after the MOS transistor Q1 is conducted, the current value of the electromagnetic coil L1 gradually increases and stores energy. Since the thermocouple valve 1 and the electromagnetic coil L1 are connected in series, the thermocouple valve 1 generates a current to maintain the valve suction, thereby maintaining the conduction of the valve gas. After the MOS transistor Q1 is turned off, the electromagnetic coil L1 generates a back electromotive force, and forms a discharge loop through the diode D1. This current keeps the valve current continuous and constant. Due to the continuous PWM regulation during ignition, the holding current of the thermocouple valve 1 is greater than the minimum suction current, so that the thermocouple valve 1 is sucked during ignition, and then the function of maintaining the valve suction is achieved.

[0058] Preferably, since the operational amplifier U1 is a differential amplifier, when there is no ignition and the PWM is in the off period, the current values of the electromagnetic coil L1 and the thermocouple valve 1 are zero, and then the voltage values on the electromagnetic coil L1 and the thermocouple valve 1 are also zero. After the PWM control is generated, when there is no fault, the current values of the electromagnetic coil L1 and the thermocouple valve 1 are not zero. An amplified signal is generated through the comparison of the amplifier output, thereby generating a change in the output voltage. According to the amplitude value of whether the output changes, it is determined whether the circuit has a fault, so as to realize the detection of the valve circuit fault.

[0059] Step S104, maintain and output the adjusted PWM signal, and detect the output voltage value of the current operational amplifier U1 to obtain a first voltage value.

[0060] Step S105, continuously detect the output voltage value of the operational amplifier U1 multiple times again, and calculate the average value of the obtained data to obtain a second voltage value.

[0061] Step S106, until the difference between the first voltage value and the second voltage value is greater than the stop ignition threshold, it is determined that the burner has been ignited, and at the same time, the discharge ignition is stopped.

[0062] In this embodiment, since the amplitude value of the operational amplifier U1 is related to the voltage values of the electromagnetic coil L1 and the thermocouple valve, and the voltage value of the operational amplifier U1 is related to the constant current value, the output voltage of the operational amplifier U1 is proportional to the current value of the thermocouple valve 1. By calculating the initial value of PWM, if the holding current of the valve is too large, the PWM is adjusted downwards; if the holding current of the valve is too small, the PWM is adjusted upwards. When the current is appropriate, the PWM is fixed. After the PWM control is determined, the first voltage value V0 of the operational amplifier U1 is saved. At this time, due to ignition combustion, the thermocouple valve 1 generates an electromotive force, which is superimposed on the thermocouple valve 1 and amplified by the operational amplifier. At this time, the output voltage value of the operational amplifier U1 becomes larger. By continuously detecting the output voltage value of the operational amplifier U1 multiple times and calculating the average value of the obtained data to obtain the second voltage value V1, when the difference between the second voltage value V1 and the first voltage value V0 is greater than the stop ignition threshold, it is determined that ignition has occurred, and the discharge ignition can be stopped, thereby realizing the detection of whether the ignition is successful.

[0063] Step S107: Continuously detect the output voltage value of the operational amplifier U1 multiple times again, and calculate the average value of the obtained data to obtain the third voltage value.

[0064] Step S108: Until the difference between the third voltage value and the first voltage value is greater than the holding threshold, it is determined that the current voltage value can maintain the suction operation of the thermocouple valve 1, and at the same time, the PWM adjustment of the CPU is stopped to enable the thermocouple valve 1 to continue to work in the current state.

[0065] In this embodiment, after stable combustion for a period of time, the high temperature further increases the electromotive force of the thermocouple valve 1. By further increasing the output voltage value of the operational amplifier U1, continuously detecting the output voltage value of the operational amplifier U1 multiple times, and calculating the average value of the obtained data to obtain the third voltage value V2, when the difference between the third voltage value V2 and the first voltage value V0 is greater than the holding threshold, it is determined that the electromotive force can stably maintain the valve suction. Then, the PWM output is turned off, that is, the PWM adjustment of the CPU is stopped to enable the thermocouple valve 1 to continue to work in the current state, thereby completing the zero-second valve suction function, and further realizing the detection of judging the valve maintenance.

[0066] Step S109: Continuously detect the output voltage value of the operational amplifier U1 multiple times again, and calculate the average value of the obtained data to obtain the fourth voltage value.

[0067] Step S110: Until the fourth voltage value is less than the flameout threshold, it is determined that the current burner has flameout, and an alarm prompt is sent outwards.

[0068] In this embodiment, when the PWM output stops, the current value of the electromagnetic coil L1 decreases, and the thermocouple valve 1 generates an electromotive force to increase the voltage input to the operational amplifier U1. At this time, the output voltage value of the operational amplifier U1 is relatively small. After the flameout, the thermocouple valve 1 cools down, the electromotive force decreases, and the output voltage of the operational amplifier U1 also decreases. The output voltage value of the operational amplifier U1 is continuously detected multiple times, and the obtained data is averaged to obtain the fourth voltage value V3. When the fourth voltage value V3 is less than the flameout threshold, it is determined that the current burner has experienced a flameout. At this time, an alarm can be issued or the valve can be actively closed. Of course, the thermocouple valve 1 can also be cooled, and the thermocouple valve 1 cannot be maintained due to too small current and the valve is closed, thereby realizing the detection of the flameout.

[0069] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the inventive concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. An ignition circuit for a thermocouple valve, characterized in that: include: A thermocouple valve, wherein the control end of the thermocouple valve is connected to an electromagnetic coil, and the power supply end of the thermocouple valve is connected to an external power supply; A pull-in control circuit, one end of which is grounded, and the other end of which is connected to the control end of the thermocouple valve through the electromagnetic coil; A diode, wherein the anode of the diode is connected to the control end of the thermocouple valve through the electromagnetic coil, and the cathode of the diode is connected to the power supply end of the thermocouple valve; A detection circuit, wherein a first input end of the detection circuit is connected to a position between the pull-in control circuit and the electromagnetic coil, and a second input end of the detection circuit is connected to a position between the thermocouple valve and an external power supply; A CPU is connected to the output end of the detection circuit.

2. The ignition circuit of a thermocouple valve according to claim 1, characterized in that: The pull-in control circuit comprises a MOS tube, a source of the MOS tube is connected to the electromagnetic coil, a gate of the MOS tube is connected to the CPU, and a drain of the MOS tube is grounded.

3. The ignition circuit of a thermocouple valve according to claim 2, characterized in that: The pull-in control circuit also includes a first resistor, one end of which is connected to the gate of the MOS tube, and the other end of which is connected to the CPU.

4. The ignition circuit of a thermocouple valve according to claim 2, characterized in that: The pull-in control circuit also includes a second resistor, one end of which is connected to the gate of the MOS tube, and the other end of which is grounded.

5. The ignition circuit of a thermocouple valve according to claim 1, characterized in that: The detection circuit includes an operational amplifier, a first input end of the operational amplifier is connected to a position between the attraction control circuit and the electromagnetic coil, a second input end is connected to a position between the thermocouple valve and an external power supply, an output end is connected to the CPU, a power supply end is connected to an external power supply, and a ground end is grounded.

6. The ignition circuit of a thermocouple valve according to claim 5, characterized in that: The detection circuit also includes a third resistor and a fourth resistor, wherein one end of the third resistor is connected to the first input end of the operational amplifier, and the other end is connected to a position between the attraction control circuit and the electromagnetic coil, and one end of the fourth resistor is connected to the second input end of the operational amplifier, and the other end is connected to a position between the thermocouple valve and the external power supply.

7. The ignition circuit of a thermocouple valve according to claim 5, characterized in that: The detection circuit further includes a fifth resistor, wherein one end of the fifth resistor is connected to the first input end of the operational amplifier, and the other end of the fifth resistor is connected to the CPU.

8. The ignition circuit of a thermocouple valve according to claim 5, characterized in that: The detection circuit further includes a sixth resistor, wherein one end of the sixth resistor is connected to the second input end, and the other end of the sixth resistor is grounded.

9. A burner head, characterized in that: An ignition circuit comprising a thermocouple valve as claimed in any one of claims 1 to 8.

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