Gas leakage self-closing valve control circuit and gas stove

Abstract

The valve control circuit comprises a temperature control part, a gas detection module, a valve closing driving module and a control module, the temperature control part outputs first driving voltage according to the temperature condition, the temperature control part is connected with a gas valve to form at least part of driving branches, and the valve closing driving module is connected with the control module. The first driving voltage can be provided for the gas valve to drive the gas valve to be opened, the input end of the valve closing driving module is connected with the first power supply, the output end of the valve closing driving module is connected with the temperature control part and the gas valve, and the valve closing driving module can output second driving voltage. The direction of the second driving voltage is opposite to that of the first driving voltage so that the first driving voltage can be counteracted to turn off the gas valve, the control module is connected with the gas detection module and the controlled end of the valve closing driving module, and the control module controls the valve closing driving module to output the second driving voltage according to the gas concentration. The design is stable and accurate in turn-off during air leakage and is safe and reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic circuits for kitchen and bathroom equipment, in particular to a valve-controlled circuit with automatic closing function for gas leakage and a gas stove. Background Art

[0002] An existing gas stove usually includes a gas valve and a gas channel. One end of the gas channel is connected to a gas source, and the other end of the gas channel is connected to a burner. The gas valve is used to control the on and off of the gas channel. When a user applies force to an operating component such as a knob or button of the gas stove, the gas valve opens, and the ignition needle is located in the stove body and is triggered to ignite. At this time, the gas is ignited. A thermocouple isothermal control component is also provided on the burner. The temperature of the temperature control component rises to form a voltage difference, which applies voltage to the gas valve to keep the gas valve open.

[0003] In order to improve the safety level, the existing gas stoves are also equipped with a gas leakage detection function. A gas concentration detection component is set on the gas stove. When the gas concentration rises, the gas valve is controlled to be shut off. However, since the gas valve needs to be started in conjunction with a temperature control unit, the circuit for adding a gas leakage detection is complicated, which can easily lead to unstable start-up or shutdown control of the gas valve, affecting safety performance. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a valve-controlled circuit and a gas stove with self-closing function when gas leaks, which can shut off gas stably and accurately, and is safe and reliable.

[0005] According to the first aspect of the utility model, a valve-controlled circuit with self-closing function in case of gas leakage comprises: a temperature control unit for detecting temperature and outputting a first driving voltage according to the temperature condition, the temperature control unit being used to be connected to a gas valve to form at least part of a driving branch, the first driving voltage being able to be provided to the gas valve to drive the gas valve to open; a gas detection module for detecting gas concentration; a valve closing driving module, the input end of the valve closing driving module being connected to a first power supply, the output end of the valve closing driving module being respectively connected to the temperature control unit and the gas valve, the valve closing driving module being able to output a second driving voltage, the second driving voltage being opposite in direction to the first driving voltage so as to offset the first driving voltage and shut down the gas valve; and a control module being respectively connected to the controlled ends of the gas detection module and the valve closing driving module, the control module controlling the valve closing driving module to output the second driving voltage according to the gas concentration.

[0006] A valve-controlled circuit with self-closing function according to an embodiment of the utility model has at least the following beneficial effects:

[0007] The utility model discloses a valve control circuit with self-closing function when gas is used. When gas is used, the gas valve is opened, the gas is output and then ignited, the flame causes the temperature of the temperature control unit to rise, and the temperature control unit outputs a first driving voltage. The first driving voltage is provided to the gas valve to maintain the gas valve open. When the gas detection module detects that the gas concentration rises, the control module controls the valve closing driving module to output a second driving voltage. Since the second driving voltage is in opposite directions to the first driving voltage, the second driving voltage offsets the first driving voltage to close the gas valve. The design can stably and accurately shut down when gas leaks, and is safe and reliable.

[0008] According to some embodiments of the utility model, the valve closing drive module includes a first switch unit, an energy storage unit and a second switch unit, the input end of the first switch unit is connected to the first power supply, the output end of the first switch unit is respectively connected to the input end of the energy storage unit and the second switch unit, the output end of the second switch unit is respectively connected to the temperature control unit and the gas valve, and the control module is respectively connected to the controlled end of the first switch unit and the controlled end of the second switch unit.

[0009] According to some embodiments of the present utility model, the energy storage unit includes a capacitor E6 and a resistor R44, one end of the resistor R44 is connected to the output end of the first switch unit, the other end of the resistor R44 is respectively connected to one end of the capacitor E6 and the input end of the second switch unit, and the other end of the capacitor E6 is grounded.

[0010] According to some embodiments of the utility model, the valve-controlled circuit with self-closing function in case of gas leakage further includes a valve opening drive module and an operation module, wherein the input end of the valve opening drive module is connected to the second power supply, and the output end of the valve opening drive module is used to connect to the gas valve, and the valve opening drive module can output a third drive voltage, and the third drive voltage can be provided to the gas valve to drive the gas valve to open, the operation module is used to generate an ignition instruction, and the control module is respectively connected to the controlled ends of the operation module and the valve opening drive module to control the valve opening drive module to output the third drive voltage according to the ignition instruction.

[0011] According to some embodiments of the utility model, the valve control circuit for self-closing when leaking also includes a timing module, which is used to generate a timing instruction. The control module is connected to the timing module to control the valve opening drive module to stop outputting the third drive voltage according to the timing instruction.

[0012] According to some embodiments of the present utility model, the valve opening drive module includes a third switch unit, the input end of the third switch unit is connected to the second power supply, the output end of the third switch unit is connected to the gas valve, and the control module is connected to the controlled end of the third switch unit.

[0013] According to some embodiments of the utility model, the valve-controlled circuit with self-closing function when leaking also includes a negative pressure conversion module, the input end of the negative pressure conversion module is connected to the first power supply, the negative pressure conversion module reversely processes the output voltage of the first power supply and outputs it at the output end of the negative pressure conversion module to form a second power supply, and the input end of the valve opening drive module is connected to the output end of the negative pressure conversion module.

[0014] According to some embodiments of the utility model, the gas detection module includes a gas concentration detection element and a voltage stabilizing unit, the input end of the voltage stabilizing unit is connected to the first power supply, the output end of the voltage stabilizing unit is connected to the gas concentration detection element to provide a working voltage for the gas concentration detection element, and the control module is connected to the gas concentration detection element to obtain a detection voltage signal, and the detection voltage signal is used to characterize the gas concentration.

[0015] According to some embodiments of the utility model, the valve control circuit with self-closing function in case of leakage also includes a flame detection module, which is connected to the temperature control unit to amplify the first driving voltage to form a flame feedback signal, and the flame feedback signal is used to characterize the presence or absence of flame, and the control module is connected to the flame detection module.

[0016] The gas stove according to the second embodiment of the utility model comprises the valve control circuit with gas leakage self-closing function disclosed in any one of the above embodiments.

[0017] The gas stove according to the embodiment of the utility model has at least the following beneficial effects:

[0018] The utility model gas stove adopts the valve control circuit with self-closing function in case of gas leakage disclosed in any of the above embodiments, and can shut off gas stably and accurately when gas leaks, which is safe and reliable.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 This is a principle structure block diagram of one embodiment of the valve control circuit of the utility model;

[0022] Figure 2 A circuit diagram of one embodiment of a control module;

[0023] Figure 3 A circuit diagram of one embodiment of a flame detection module;

[0024] Figure 4 A circuit diagram of one embodiment of a gas detection module;

[0025] Figure 5 A circuit diagram of one embodiment of a valve closing drive module and a valve opening drive module;

[0026] Figure 6 A circuit diagram of one embodiment of a negative pressure conversion module.

[0027] Reference numerals:

[0028] Temperature control unit 100; gas detection module 200; gas concentration detection element 210; voltage stabilizing unit 220; valve closing drive module 300; first switch unit 310; energy storage unit 320; second switch unit 330; control module 400; valve opening drive module 500; operation module 510; timing module 520; negative pressure conversion module 600; flame detection module 700; gas valve 800. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figure 1-Figure 6 As shown, a valve control circuit with gas leakage self-closing according to the first aspect of the utility model includes a temperature control unit 100, a gas detection module 200, a valve closing drive module 300 and a control module 400, wherein the temperature control unit 100 is used to detect the temperature and output a first drive voltage according to the temperature condition, the temperature control unit 100 is used to be connected to the gas valve 800 to form at least part of the drive branch, the first drive voltage can be provided to the gas valve 800 to drive the gas valve 800 to open, the gas detection module 200 is used to detect the gas concentration, and the input end of the valve closing drive module 300 is connected to the gas valve 800 to drive the gas valve 800 to open. The control module 400 is connected to the gas detection module 200 and the controlled end of the valve closing drive module 300, and the control module 400 controls the valve closing drive module 300 to output the second drive voltage according to the gas concentration.

[0034] Among them, Figure 2 As shown, the control module 400 can be selected from a conventional MCU, CPU or a processing chip with processing functions and its associated circuits, and the temperature control unit 100 can be a thermocouple or other temperature controller for detecting temperature and forming a voltage signal output.

[0035] The valve-controlled circuit can be applied to a gas stove or a gas water heater. Taking a gas stove as an example, a gas stove usually includes a burner, an ignition needle and a gas channel. One end of the gas channel is connected to the gas source, and the other end of the gas channel is connected to the burner. The gas valve 800 is used to control the on and off of the gas channel. Specifically, there can be multiple burners, and the number and arrangement of the gas channels and gas valves 800 correspond to the burners one by one. The user can input an ignition command into the control module 400. The control module 400 controls the gas valve 800 to open and controls the ignition needle located at the burner to ignite, and the gas is ignited.

[0036] The utility model discloses a valve-controlled circuit that closes when gas leaks. When gas is used, the gas valve 800 is opened, the gas is output and then ignited, the flame causes the temperature of the temperature control unit 100 to rise, the temperature control unit 100 outputs a first drive voltage, the first drive voltage is provided to the gas valve 800, and the gas valve 800 is kept open. When the gas detection module 200 detects that the gas concentration rises, the control module 400 controls the valve closing drive module 300 to output a second drive voltage. Since the second drive voltage is in opposite directions to the first drive voltage, the second drive voltage offsets the first drive voltage and the gas valve 800 is closed. The design can be stably and accurately closed when gas leaks, and is safe and reliable.

[0037] In some embodiments of the present invention, Figure 5 As shown, the valve closing drive module 300 includes a first switch unit 310, an energy storage unit 320 and a second switch unit 330, the input end of the first switch unit 310 is connected to the first power supply, the output end of the first switch unit 310 is respectively connected to the input end of the energy storage unit 320 and the second switch unit 330, the output end of the second switch unit 330 is respectively connected to the temperature control unit 100 and the gas valve 800, and the control module 400 is respectively connected to the controlled end of the first switch unit 310 and the controlled end of the second switch unit 330.

[0038] When the gas concentration rises, the control module 400 needs to turn off the gas valve 800. The control module 400 first opens the first switch unit 310 and disconnects the second switch unit 330. The first power supply charges the energy storage unit 320. Then the control module 400 turns off the first switch unit 310 and turns on the second switch unit 330. The energy storage unit 320 discharges to form a second driving voltage, forming a reverse current shock to turn off the gas valve 800. The energy storage unit 320 is used here to boost the voltage and form a current shock to quickly turn off the gas valve 800.

[0039] Specifically, the first switch unit 310 can select a semiconductor switch tube Q4, the second switch unit 330 can select a semiconductor switch tube Q6, the energy storage unit 320 includes a capacitor E6 and a resistor R44, one end of the resistor R44 is connected to the output end of the first switch unit 310, the other end of the resistor R44 is respectively connected to one end of the capacitor E6 and the input end of the second switch unit 330, and the other end of the capacitor E6 is grounded.

[0040] Generally speaking, an operation module 510 is provided on a gas stove and other equipment. The operation module 510 can be a push knob, etc. The user applies force to the push knob and rotates it to drive the gas valve 800 to open and form a flame on the stove head. However, it is necessary to wait for the flame to heat the temperature control unit 100. The temperature of the temperature control unit 100 rises to a certain level before the temperature control unit 100 can output a first driving voltage to drive the gas valve 800 to remain open. If the time is too short, the user stops applying force to the push knob, and the temperature control unit 100 fails to output the first driving voltage, then the gas valve 800 will be turned off and the flame will go out.

[0041] In order to reduce the time that the user applies force to press the knob, in some embodiments of the present invention, Figure 5 As shown, the valve control circuit with self-closing function due to leakage also includes a valve opening drive module 500, the input end of the valve opening drive module 500 is connected to the second power supply, the output end of the valve opening drive module 500 is used to connect to the gas valve 800, the valve opening drive module 500 can output a third drive voltage, and the third drive voltage can be provided to the gas valve 800 to drive the gas valve 800 to open, the operation module 510 is used to generate an ignition instruction, and the control module 400 is respectively connected to the operation module 510 and the controlled end of the valve opening drive module 500 to control the valve opening drive module 500 to output the third drive voltage according to the ignition instruction.

[0042] When the user applies force to the operating module 510, the operating module 510 outputs an ignition command to the control module 400. The control module 400 can control the valve opening drive module 500 to continuously output the third drive voltage to the gas valve 800. The third drive voltage and the first drive voltage are in the same direction. When the temperature control unit 100 does not output the first drive voltage, the gas valve 800 can also remain open. When the temperature control unit 100 outputs the first drive voltage, the control module 400 can control the valve opening drive module 500 to stop outputting the third drive voltage. This method can reduce the time the user applies force to press the knob, achieve instantaneous ignition, and is more convenient to use.

[0043] In addition, the valve opening drive module 500 can also cooperate with the valve closing drive module 300. When the gas concentration in the environment is too high, the second drive voltage output by the valve closing drive module 300 can also offset the third drive voltage, thereby causing the gas valve 800 to lose power and shut down, which is safe and reliable.

[0044] In some embodiments of the present invention, Figure 1 As shown, the valve control circuit with self-closing function when leakage also includes a timing module 520, which is used to generate a timing instruction. The control module 400 is connected to the timing module 520 to control the valve opening drive module 500 to stop outputting the third drive voltage according to the timing instruction.

[0045] The timing module 520 can be a conventional timer, a crystal oscillator timing circuit or a timing program in the control module 400. When the user applies force to the operating module 510 to form an ignition command, the timing module 520 can also trigger the timing according to the ignition command, and then generate a timing command. During a certain timing time, the valve opening drive module 500 is maintained to output the third drive voltage. After the timing time is reached, the valve opening drive module 500 is controlled to stop outputting the third drive voltage, and the gas valve 800 is maintained open by the first drive voltage. The control is orderly and reasonable, safe and stable.

[0046] Specifically, Figure 5 As shown, the valve opening drive module 500 includes a third switch unit, the input end of the third switch unit is connected to the second power supply, the output end of the third switch unit is connected to the gas valve 800, and the control module 400 is connected to the controlled end of the third switch unit.

[0047] The third switch unit includes semiconductor switch tubes Q5 and Q7. The switch tube Q5 is connected to the gas valve 800 and the second power supply respectively. The second power supply outputs a third driving voltage through the switch tube Q5. The control module 400 is connected to the controlled pole of the switch tube Q5 through the switch tube Q7. The control module 400 forms a driving signal for driving the switch tube Q5 to turn on and off by controlling the switch tube Q7 to turn on and off.

[0048] In some embodiments of the present invention, Figure 6 As shown, the valve control circuit with self-closing function when leakage also includes a negative pressure conversion module 600, the input end of which is connected to the first power supply, the negative pressure conversion module 600 reversely processes the output voltage of the first power supply and outputs it at the output end of the negative pressure conversion module 600 to form a second power supply, and the input end of the valve opening drive module 500 is connected to the output end of the negative pressure conversion module 600.

[0049] Since the second driving voltage and the third driving voltage are opposite to each other, in order to reduce the number of power supply devices, the present design uses one power supply device, and the output of the power supply device itself serves as the first power supply, and the negative voltage conversion module 600 can be selected from a conventional voltage inversion chip or circuit. The input end of the negative voltage conversion module 600 is connected to the first power supply, and the output end of the negative voltage conversion module 600 outputs a reverse voltage as the second power supply, which has a simpler structure and reduces the layout cost.

[0050] In some embodiments of the present invention, Figure 4As shown, the gas detection module 200 includes a gas concentration detection element 210 and a voltage stabilizing unit 220, the input end of the voltage stabilizing unit 220 is connected to the first power supply, the output end of the voltage stabilizing unit 220 is connected to the gas concentration detection element 210 to provide a working voltage for the gas concentration detection element 210, and the control module 400 is connected to the gas concentration detection element 210 to obtain a detection voltage signal, and the detection voltage signal is used to characterize the gas concentration.

[0051] The voltage stabilizing unit 220 provides a relatively stable operating voltage for the gas concentration detection element 210. When the gas concentration in the environment changes, the detection voltage signal output by the gas concentration detection element 210 changes. For example, as the gas concentration increases, the amplitude of the detection voltage signal also increases. The control module 400 can then calculate the change in gas concentration.

[0052] Specifically, the voltage stabilizing unit 220 includes a semiconductor switch tube Q20, the input end of the switch tube Q20 is connected to the first power supply, the output end of the switch tube Q20 is connected to the gas concentration detection element 210, the control module 400 is connected to the controlled end of the switch tube Q20, and the control module 400 adjusts the stable working voltage by controlling the turn-on threshold of the switch tube Q20.

[0053] In some embodiments of the present invention, Figure 3 As shown, the valve control circuit with self-closing function when leakage also includes a flame detection module 700, which is connected to the temperature control unit 100 to amplify the first driving voltage to form a flame feedback signal, and the flame feedback signal is used to characterize the presence or absence of flame. The control module 400 is connected to the flame detection module 700.

[0054] The flame detection module 700 provides a flame feedback signal to the control module 400. The control module 400 learns whether there is a flame based on the flame feedback signal. At this time, since there is no flame, the temperature control unit 100 will not output the first drive voltage, and the gas valve 800 is turned off. When the user does not input an ignition command, the control module 400 prohibits the gas valve 800 from being opened by the valve opening drive module 500 based on the flame feedback signal, and can also send a prompt or alarm message to the user when there is no flame based on the flame feedback signal.

[0055] The flame detection module 700 here can be selected in the signal amplification chip and connected to the temperature control unit 100. The signal amplification chip amplifies the first driving voltage of the temperature control unit 100 to form a flame feedback signal. The structure is simple and the layout cost is saved.

[0056] The gas stove according to the second embodiment of the utility model comprises the valve control circuit with gas leakage self-closing function disclosed in any one of the above embodiments.

[0057] The utility model gas stove adopts the valve control circuit with self-closing function in case of gas leakage disclosed in any of the above embodiments, and can shut off gas stably and accurately when gas leaks, which is safe and reliable.

[0058] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A valve-controlled circuit with self-closing function when leakage occurs, characterized in that: include: A temperature control unit, used for detecting temperature and outputting a first driving voltage according to the temperature condition, wherein the temperature control unit is used for connecting with the gas valve to form at least a part of the driving branch, and the first driving voltage can be provided to the gas valve to drive the gas valve to open; Gas detection module, used to detect gas concentration; A valve closing drive module, wherein the input end of the valve closing drive module is connected to the first power supply, the output end of the valve closing drive module is respectively connected to the temperature control unit and the gas valve, and the valve closing drive module can output a second drive voltage, and the second drive voltage is opposite to the first drive voltage in direction so as to offset the first drive voltage and close the gas valve; The control module is connected to the gas detection module and the controlled end of the valve closing drive module respectively, and the control module controls the valve closing drive module to output a second drive voltage according to the gas concentration.

2. The valve-controlled circuit with self-closing function when leakage occurs according to claim 1, characterized in that: The valve closing drive module includes a first switch unit, an energy storage unit and a second switch unit. The input end of the first switch unit is connected to the first power supply, the output end of the first switch unit is respectively connected to the input end of the energy storage unit and the second switch unit, the output end of the second switch unit is respectively connected to the temperature control unit and the gas valve, and the control module is respectively connected to the controlled end of the first switch unit and the controlled end of the second switch unit.

3. A valve-controlled circuit with self-closing function when leakage occurs according to claim 2, characterized in that: The energy storage unit includes a capacitor E6 and a resistor R44, one end of the resistor R44 is connected to the output end of the first switch unit, the other end of the resistor R44 is respectively connected to one end of the capacitor E6 and the input end of the second switch unit, and the other end of the capacitor E6 is grounded.

4. The valve-controlled circuit with self-closing function when leakage occurs according to claim 1, characterized in that: It also includes a valve opening drive module and an operation module, wherein the input end of the valve opening drive module is connected to the second power supply, and the output end of the valve opening drive module is used to connect to the gas valve, the valve opening drive module can output a third drive voltage, and the third drive voltage can be provided to the gas valve to drive the gas valve to open, the operation module is used to generate an ignition instruction, and the control module is respectively connected to the operation module and the controlled end of the valve opening drive module to control the valve opening drive module to output the third drive voltage according to the ignition instruction.

5. A valve-controlled circuit with self-closing function when leakage occurs according to claim 4, characterized in that: It also includes a timing module, which is used to generate a timing instruction. The control module is connected to the timing module to control the valve opening drive module to stop outputting the third drive voltage according to the timing instruction.

6. A valve-controlled circuit with self-closing function when leakage occurs according to claim 4, characterized in that: The valve opening drive module includes a third switch unit, an input end of the third switch unit is connected to the second power supply, an output end of the third switch unit is connected to the gas valve, and the control module is connected to the controlled end of the third switch unit.

7. A valve-controlled circuit with self-closing function when leakage occurs according to claim 4, characterized in that: It also includes a negative pressure conversion module, the input end of the negative pressure conversion module is connected to the first power supply, the negative pressure conversion module reversely processes the output voltage of the first power supply and outputs it at the output end of the negative pressure conversion module to form a second power supply, and the input end of the valve opening drive module is connected to the output end of the negative pressure conversion module.

8. The valve-controlled circuit with self-closing function when leakage occurs according to claim 1, characterized in that: The gas detection module includes a gas concentration detection element and a voltage stabilizing unit, the input end of the voltage stabilizing unit is connected to a first power supply, the output end of the voltage stabilizing unit is connected to the gas concentration detection element to provide a working voltage for the gas concentration detection element, and the control module is connected to the gas concentration detection element to obtain a detection voltage signal, and the detection voltage signal is used to characterize the gas concentration.

9. The valve-controlled circuit with self-closing function when leakage occurs according to claim 1, characterized in that: It also includes a flame detection module, which is connected to the temperature control unit to amplify the first driving voltage to form a flame feedback signal, and the flame feedback signal is used to indicate whether there is a flame. The control module is connected to the flame detection module.

10. A gas stove, characterized in that: It comprises a valve-controlled circuit with self-closing function in case of leakage as claimed in any one of claims 1 to 9.

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