Gas valve control circuit and gas appliance

Abstract

The present invention discloses a gas valve control circuit and a gas appliance. The gas valve control circuit includes: a power supply module, provided with a voltage output terminal, the voltage output terminal being grounded in turn to the secondary coil of a dual-coil solenoid valve through a voltage-dividing resistor; and a voltage detection module, provided with a voltage detection terminal, the voltage detection terminal being connected between the voltage-dividing resistor and the secondary coil. With this arrangement, when the voltage detection module detects a high level, it indicates that the secondary coil of the dual-coil solenoid valve is damaged. The voltage detection module cannot be directly grounded and instead detects the voltage of the power supply module. Therefore, a user can determine whether the secondary coil of the dual-coil solenoid valve is damaged by the high and low level signals detected by the voltage detection module. When the secondary coil of the dual-coil solenoid valve is damaged, the user can personally close the dual-coil solenoid valve, thereby preventing the occurrence of a fire and ensuring user safety.

Description

Technical Field

[0001] The present invention relates to the technical field of gas valves, and in particular to a gas valve control circuit and a gas appliance. Background Art

[0002] Currently, the gas valve of the stove usually adopts a solenoid valve, which has an auxiliary ignition power supply. When the user presses the ignition switch, the auxiliary ignition power supply supplies power to the solenoid valve, causing the solenoid valve to attract the iron sheet and make the gas path conductive. When there is a sufficient temperature difference between the thermocouples, sufficient voltage is generated to supply power to the solenoid valve, and then the auxiliary ignition power supply is turned off and no longer supplies power to the solenoid valve.

[0003] In some newer stoves with timing and dry-burn prevention features, the gas valve often uses a dual-coil solenoid valve. This valve closes by injecting a current in the secondary coil opposite to the pull-in current. This magnetic field creates a reverse current in the primary coil, which cancels out the current generated by the thermocouple, disengaging the valve body and achieving automatic closing.

[0004] For a double-coil solenoid valve, if the secondary coil of the double-coil solenoid valve is damaged during use, and the user is unaware of it, once the timing time is up or the anti-dry burning function is activated, the main coil cannot control the valve body to detach due to the damage of the secondary coil, so the valve cannot be automatically closed.

[0005] Therefore, in the prior art, the user cannot know whether the secondary coil of the solenoid valve is damaged, which may cause a fire and seriously endanger the user's safety. Summary of the Invention

[0006] Therefore, the embodiments of the present invention aim to solve the problem in the prior art that the user cannot know whether the secondary coil of the solenoid valve is damaged, thereby providing a new gas valve control circuit and gas appliance.

[0007] To achieve the above object, an embodiment of the present invention provides a gas valve control circuit, which includes: a power supply module, provided with a voltage output terminal, the voltage output terminal being grounded to the auxiliary coil of the dual-coil solenoid valve through a voltage-dividing resistor in turn;

[0008] The voltage detection module is provided with a voltage detection terminal, and the voltage detection terminal is connected between the voltage dividing resistor and the secondary coil.

[0009] Optionally, the voltage detection module includes:

[0010] A control chip is provided with the voltage detection terminal;

[0011] A current limiting resistor, one end of which is connected to the voltage detection end, and the other end of which is connected between the voltage dividing resistor and the secondary coil.

[0012] Optionally, the gas valve control circuit further includes:

[0013] At least one set of current increasing modules, each of which is internally provided with a switching circuit;

[0014] Under the action of the switching circuit, the current increasing module has a state of being connected in parallel with the voltage dividing resistor and a state of being disconnected from the circuit; after the current increasing module is connected in parallel with the voltage dividing resistor, the current flowing through the secondary coil becomes larger, and the dual-coil solenoid valve is closed.

[0015] Optionally, the flow increasing module includes:

[0016] A current increasing resistor, one end of which is connected to the voltage output end, and the other end of which is connected between the voltage dividing resistor and the secondary coil via the switch circuit.

[0017] Optionally, two groups of flow increasing modules are provided, including a first flow increasing module and a second flow increasing module connected in parallel.

[0018] Optionally, the switch circuit in the first current increasing module is a micro switch, the current increasing resistor in the first current increasing module includes a first resistor and a second resistor connected in series, and the micro switch is connected between the first resistor and the second resistor.

[0019] Optionally, the switch circuit in the second current increasing module is a switch tube, the switch tube is provided with a control end, a first end and a second end, and the current increasing resistor in the second current increasing module is a third resistor;

[0020] The control end is connected between the first resistor and the micro switch, the first end is connected to the power module, and the second end is connected between the voltage divider resistor and the secondary coil through the third resistor.

[0021] Optionally, the gas valve control circuit further includes:

[0022] A fourth resistor, one end of which is connected to the voltage output terminal, and the other end of which is connected to the secondary coil of the dual-coil solenoid valve via a voltage divider resistor and is grounded. The resistance of the fourth resistor is much smaller than that of the voltage divider resistor.

[0023] Optionally, the gas valve control circuit further includes:

[0024] a first filtering module connected in parallel to a circuit in which the voltage-dividing resistor and the secondary coil are connected in series;

[0025] The second filtering module is connected in parallel with the secondary coil.

[0026] An embodiment of the present invention further provides a burning appliance, which includes: the gas valve control circuit described in any one of the above embodiments.

[0027] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0028] 1. An embodiment of the present invention provides a gas valve control circuit, comprising: a power supply module, provided with a voltage output terminal, the voltage output terminal being grounded in sequence through a voltage-dividing resistor and a secondary coil of a dual-coil solenoid valve; and a voltage detection module, provided with a voltage detection terminal, the voltage detection terminal being connected between the voltage-dividing resistor and the secondary coil.

[0029] With this setup, when the voltage detection module detects a low level, it indicates the solenoid valve's secondary coil is conducting properly, allowing the voltage detection module to be directly grounded. However, when the voltage detection module detects a high level, it indicates the solenoid valve's secondary coil is damaged. The voltage detection module cannot directly ground the secondary coil and instead detects the voltage of the power module. Therefore, users can determine whether the secondary coil of the dual-coil solenoid valve is damaged based on the high and low level signals detected by the voltage detection module. If the secondary coil of the dual-coil solenoid valve is damaged, the user can manually close the valve, preventing fire and ensuring user safety.

[0030] 2. When the voltage detection module detects a low level, it indicates that the secondary coil of the dual-coil solenoid valve is functioning properly. This embodiment of the present invention incorporates a microswitch. When the cooktop reaches its set time or anti-dry-burn time, the user can manually close the microswitch, connecting the current-increasing module to the circuit. This increases the current flowing through the secondary coil of the dual-coil solenoid valve, allowing the valve to close properly, thus preventing fires and ensuring user safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary workers in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 This is a structural diagram of a gas valve control circuit according to an embodiment of the present invention.

[0033] Reference numerals:

[0034] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, current limiting resistor; R6, voltage divider resistor; C1, first filter module; C2, second filter module; Q1, switch tube; S1, micro switch. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary workers in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components; and wireless or wired connections. A person skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Currently, the gas valve of the stove usually adopts a solenoid valve, which has an auxiliary ignition power supply. When the user presses the ignition switch, the auxiliary ignition power supply supplies power to the solenoid valve, causing the solenoid valve to attract the iron sheet and make the gas path conductive. When there is a sufficient temperature difference between the thermocouples, sufficient voltage is generated to supply power to the solenoid valve, and then the auxiliary ignition power supply is turned off and no longer supplies power to the solenoid valve.

[0040] In some newer stoves with timing and dry-burn prevention features, the gas valve often uses a dual-coil solenoid valve. This valve closes by injecting a current in the secondary coil opposite to the pull-in current. This magnetic field creates a reverse current in the primary coil, which cancels out the current generated by the thermocouple, disengaging the valve body and achieving automatic closing.

[0041] For a double-coil solenoid valve, if the secondary coil of the double-coil solenoid valve is damaged during use, and the user is unaware of it, once the timing time is up or the anti-dry burning function is activated, the main coil cannot control the valve body to detach due to the damage of the secondary coil, so the valve cannot be automatically closed.

[0042] Therefore, in the prior art, the user cannot know whether the secondary coil of the solenoid valve is damaged, which may cause a fire and seriously endanger the user's safety.

[0043] The embodiments of the present invention aim to solve the problem in the prior art that a user cannot know whether the secondary coil of a solenoid valve is damaged, thereby providing a new gas valve control circuit and a gas appliance.

[0044] Example 1

[0045] like Figure 1 As shown, an embodiment of the present invention provides a gas valve control circuit, which includes a power supply module and a voltage detection module.

[0046] Specifically, in this embodiment of the present invention, the power module is provided with a voltage output terminal, which is connected to the ground through a voltage divider resistor R6 and the secondary coil of the dual-coil solenoid valve. The voltage detection module is provided with a voltage detection terminal, which is connected between the voltage divider resistor R6 and the secondary coil.

[0047] During actual operation, when the cooker is ignited by electrical ignition and in normal operation, the voltage divider resistor R6 and the secondary coil generate a voltage divider, and the voltage divided by the secondary coil enters the voltage detection terminal. Because the secondary coil is grounded, the voltage detection module actually detects a low level. At this time, the voltage detection module can determine whether the solenoid valve is open based on the voltage value divided by the secondary coil.

[0048] Assume the solenoid valve is disconnected—that is, the secondary coil is damaged. Since the secondary coil is disconnected, there's no loop in the circuit, and the voltage divider resistor R6 doesn't divide the voltage with the secondary coil. In this case, the voltage detection terminal instead detects the power module's voltage, which is a higher level. This indicates the solenoid valve is disconnected, thus enabling solenoid valve detection.

[0049] With this setup, when the voltage detection module detects a low level, it indicates the solenoid valve's secondary coil is conducting properly, allowing the voltage detection module to be directly grounded. However, when the voltage detection module detects a high level, it indicates the solenoid valve's secondary coil is damaged. The voltage detection module cannot directly ground the secondary coil and instead detects the voltage of the power module. Therefore, users can determine whether the secondary coil of the dual-coil solenoid valve is damaged based on the high and low level signals detected by the voltage detection module. If the secondary coil of the dual-coil solenoid valve is damaged, the user can manually close the valve, preventing fire and ensuring user safety.

[0050] Furthermore, in an optional embodiment of the present invention, the voltage detection module includes a control chip and a current-limiting resistor R5. Specifically, the control chip is provided with the voltage detection terminal, one end of the current-limiting resistor R5 is connected to the voltage detection terminal, and the other end of the current-limiting resistor R5 is connected between the voltage-dividing resistor R6 and the secondary coil.

[0051] Furthermore, in an optional embodiment of the present invention, the gas valve control circuit further includes at least one current increasing module, each of which is internally provided with a switching circuit. Under the action of the switching circuit, the current increasing module can be connected in parallel with the voltage-dividing resistor R6 or disconnected from the circuit. When the current increasing module is connected in parallel with the voltage-dividing resistor R6, the current flowing through the secondary coil increases, closing the dual-coil solenoid valve.

[0052] Specifically, the current increasing module further includes a current increasing resistor, one end of which is connected to the voltage output end, and the other end of which is connected between the voltage dividing resistor R6 and the secondary coil through the switch circuit.

[0053] In an embodiment of the present invention, two sets of current increasing modules can be provided, comprising a first current increasing module and a second current increasing module connected in parallel. Furthermore, the switching circuit in the first current increasing module can be a microswitch, wherein the current increasing resistors in the first current increasing module include a first resistor R1 and a second resistor R2 connected in series, with the microswitch connected between the first resistor R1 and the second resistor R2. The switching circuit in the second current increasing module can be a switch transistor Q1, which has a control terminal, a first terminal, and a second terminal, and the current increasing resistor in the second current increasing module is a third resistor R3. Specifically, the control terminal of the switch transistor Q1 is connected between the first resistor R1 and the microswitch, the first terminal of the switch transistor Q1 is connected to the power module, and the second terminal of the switch transistor Q1 is connected between the voltage divider resistor R6 and the secondary coil via the third resistor R3. The switch transistor Q1 can be a transistor. Furthermore, the switch transistor Q1 can be a transistor or a MOS transistor. Those skilled in the art can modify the configuration based on actual conditions, as long as the same technical effect is achieved.

[0054] When the cooker is working normally, if the micro switch S1 is turned off and the transistor is not conducting, the current will flow from the power module through the voltage divider resistor R6 and the secondary coil to the ground. Since the resistance of the voltage divider resistor R6 is large, the current flowing through the solenoid valve is small and the valve body cannot be closed.

[0055] When the cooker is operating normally, if the microswitch S1 is closed, the base of the transistor is grounded and conductive. At this time, the voltage divider resistor R6 is connected in parallel with the first resistor R1, the second resistor R2, and the third resistor R3. The resistance values ​​of the first resistor R1, the second resistor R2, and the third resistor R3 are much smaller than the voltage divider resistor R6, resulting in an increase in the current flowing through the secondary coil. The increased current can close the solenoid valve, thereby closing the valve body.

[0056] When the voltage detection module detects a low level, it indicates that the secondary coil of the dual-coil solenoid valve is functioning properly. This embodiment of the present invention utilizes a microswitch to alert the user when the cooktop reaches its set time or the anti-dry-burn timer. The user can manually close the microswitch, connecting the current-increasing module to the circuit. This increases the current flowing through the secondary coil of the dual-coil solenoid valve, allowing the valve to close properly, thus preventing fires and ensuring user safety.

[0057] Furthermore, in an optional embodiment of the present invention, the gas valve control circuit further includes a fourth resistor R4, one end of which is connected to the voltage output terminal, and the other end of which is connected to the secondary coil of the dual-coil solenoid valve via a voltage divider resistor R6 and grounded. The resistance of the fourth resistor R4 is significantly smaller than that of the voltage divider resistor R6.

[0058] Furthermore, in an optional embodiment of the present invention, the gas valve control circuit further includes a first filter module C1 and a second filter module C2. The first filter module C1 is connected in parallel with the circuit formed by the series connection of the voltage-dividing resistor R6 and the secondary coil. The second filter module C2 is connected in parallel with the secondary coil. Both the first filter module C1 and the second filter module C2 can be configured as capacitors. When the second filter module C2 is provided, the current-limiting resistor R5 is used to absorb the electrical energy of the capacitor in the second filter module C2, preventing excessive discharge current from the capacitor and thereby preventing damage to the solenoid valve connected in parallel therewith.

[0059] When both the first filter module C1 and the first resistor R1 are provided, the capacitor of the first filter module C1 prevents voltage spikes and absorbs overvoltage spikes. The series-connected first resistor R1 acts as a damper, dissipating the energy of overvoltage. Generally, their combined use suppresses circuit oscillations. Of course, those skilled in the art may also opt out of both the first filter module C1 and the first resistor R1 based on practical circumstances.

[0060] An embodiment of the present invention further provides a burning appliance, which includes the gas valve control circuit described in any one of the above embodiments.

[0061] With this setup, when the voltage detection module detects a low level, it indicates the solenoid valve's secondary coil is conducting properly, allowing the voltage detection module to be directly grounded. However, when the voltage detection module detects a high level, it indicates the solenoid valve's secondary coil is damaged. The voltage detection module cannot directly ground the secondary coil and instead detects the voltage of the power module. Therefore, users can determine whether the secondary coil of the dual-coil solenoid valve is damaged based on the high and low level signals detected by the voltage detection module. If the secondary coil of the dual-coil solenoid valve is damaged, the user can manually close the valve, preventing fire and ensuring user safety.

[0062] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. A person skilled in the art would be able to make other variations or modifications based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A gas valve control circuit, characterized in that: include: The power supply module is provided with a voltage output terminal, and the voltage output terminal is grounded to the auxiliary coil of the dual-coil solenoid valve through a voltage dividing resistor (R6); A voltage detection module is provided with a voltage detection terminal, wherein the voltage detection terminal is connected between the voltage dividing resistor (R6) and the secondary coil; At least one set of current increasing modules, each of which is internally provided with a switching circuit; Under the action of the switching circuit, the current increasing module has a state of being connected in parallel with the voltage dividing resistor (R6) and a state of being disconnected from the circuit; after the current increasing module is connected in parallel with the voltage dividing resistor (R6), the current flowing through the secondary coil increases, and the dual-coil solenoid valve is closed; The flow increasing module comprises: a current increasing resistor, one end of which is connected to the voltage output end, and the other end of which is connected between the voltage dividing resistor (R6) and the secondary coil via the switch circuit; Two groups of flow increasing modules are provided, including a first flow increasing module and a second flow increasing module connected in parallel with each other; The switch circuit in the first current increasing module is a micro switch (S1), the current increasing resistor in the first current increasing module comprises a first resistor (R1) and a second resistor (R2) connected in series, and the micro switch (S1) is connected between the first resistor (R1) and the second resistor (R2); The switch circuit in the second current increasing module is a switch tube (Q1), the switch tube (Q1) is provided with a control end, a first end and a second end, and the current increasing resistor in the second current increasing module is a third resistor (R3); The control end is connected between the first resistor (R1) and the micro switch (S1), the first end is connected to the power module, and the second end is connected between the voltage divider resistor (R6) and the secondary coil through the third resistor (R3); A fourth resistor (R4), one end of the fourth resistor (R4) is connected to the voltage output end, and the other end of the fourth resistor (R4) is grounded to the secondary coil of the dual-coil solenoid valve through a voltage divider resistor (R6), and the resistance of the fourth resistor (R4) is much smaller than the resistance of the voltage divider resistor (R6).

2. The gas valve control circuit according to claim 1, characterized in that: The voltage detection module includes: A control chip is provided with the voltage detection terminal; A current limiting resistor (R5), one end of the current limiting resistor (R5) is connected to the voltage detection end, and the other end of the current limiting resistor (R5) is connected between the voltage dividing resistor (R6) and the secondary coil.

3. The gas valve control circuit according to claim 1 or 2, characterized in that: Also includes: A first filtering module (C1) is connected in parallel to a circuit formed by connecting the voltage-dividing resistor (R6) and the secondary coil in series; The second filtering module (C2) is connected in parallel with the secondary coil.

4. A burning appliance, characterized in that: include: The gas valve control circuit according to any one of claims 1 to 3.

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