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 to the secondary coil of a dual-coil solenoid valve via a voltage-dividing resistor; 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; a power-off reset module, connected in parallel with the voltage-dividing resistor; the power-off reset module having a state of being disconnected from the circuit, and a state of being connected in parallel with the voltage-dividing resistor and unable to be disconnected from the parallel connection with the voltage-dividing resistor; after the power-off reset module is connected in parallel with the voltage-dividing resistor, the current flowing through the secondary coil increases, and the dual-coil solenoid valve is closed. When the voltage detection module detects a high level, it indicates that the secondary coil is damaged. The user can then use the power-off reset module to personally close the dual-coil solenoid valve, thereby preventing 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-mentioned objectives, an embodiment of the present invention provides a gas valve control circuit, which includes: a power supply module, provided with a voltage output terminal, which is grounded in turn through a voltage-dividing resistor and a secondary coil of a dual-coil solenoid valve; a voltage detection module, provided with a voltage detection terminal, which is connected between the voltage-dividing resistor and the secondary coil; a power-off reset module, which is connected in parallel with the voltage-dividing resistor; the power-off reset module has a state of not being connected to the circuit, and a state of being connected in parallel with the voltage-dividing resistor when the circuit is connected and cannot be disconnected from the parallel connection with the voltage-dividing resistor; after the power-off reset module is connected in parallel with the voltage-dividing resistor, the current flowing through the secondary coil increases, and the dual-coil solenoid valve is closed.

[0008] Optionally, the voltage detection module includes:

[0009] A control chip is provided with the voltage detection terminal;

[0010] 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.

[0011] Optionally, the power-off reset module includes:

[0012] a first switching tube, wherein a control end of the first switching tube is connected to the voltage output end, a first end of the first switching tube is connected to the voltage output end, and a second end of the first switching tube is connected between the voltage divider resistor and the auxiliary coil;

[0013] a micro switch, wherein a first end of the micro switch is connected to the control end of the first switching tube, and a second end of the micro switch is connected to the second end of the first switching tube;

[0014] A second switch tube, wherein the control end of the second switch tube is connected between the voltage divider resistor and the secondary coil through a first resistor, the first end of the second switch tube is connected to the first end of the micro switch, and the second end of the second switch tube is grounded.

[0015] Optionally, the power-off reset module further includes:

[0016] A second resistor, one end of the second resistor is connected to the control end of the first switch tube, and the other end of the second resistor is connected to the first end of the first switch tube.

[0017] Optionally, the power-off reset module further includes:

[0018] a third resistor, one end of the third resistor being connected to the control end of the first switch tube, and the other end of the third resistor being connected to the first end of the second switch tube.

[0019] Optionally, the power-off reset module further includes:

[0020] a fourth resistor, one end of the fourth resistor being connected to the second end of the first switch tube, and the other end of the third resistor being connected to the control end of the second switch tube; and a resistance value of the first resistor and a resistance value of the fourth resistor being much smaller than a resistance value of the voltage divider resistor.

[0021] Optionally, the power-off reset module further includes:

[0022] A fifth resistor is connected between the voltage output end and the second resistor, and a first end of the first switch tube is connected between the second resistor and the fifth resistor.

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

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

[0025] Optionally, the gas valve control circuit further includes:

[0026] The second filtering module is connected in parallel with the secondary coil.

[0027] 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.

[0028] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0029] 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 to a secondary coil of a dual-coil solenoid valve via a voltage-dividing resistor; 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; a power-off reset module, connected in parallel with the voltage-dividing resistor; the power-off reset module having a state of being disconnected from the circuit, and a state of being connected in parallel with the voltage-dividing resistor and unable to be disconnected from the parallel connection with the voltage-dividing resistor; after the power-off reset module is connected in parallel with the voltage-dividing resistor, the current flowing through the secondary coil increases, and the dual-coil solenoid valve is closed.

[0030] 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.

[0031] Moreover, when the cooker is working normally and the timing time is reached or the anti-dry-burning time is reached, the user is reminded that the user can operate the power-off reset module. After the double-coil solenoid valve is closed by the power-off reset module, the solenoid valve is always in the closed state and cannot be opened again. Therefore, the user needs to reset the power personally to cut off the current from the source, further ensuring the user's safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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.

[0033] Figure 1 This is a structural diagram of a gas valve control circuit according to an embodiment of the present invention.

[0034] Reference numerals:

[0035] R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; R5, fifth resistor; R6, current limiting resistor; R7, voltage divider resistor; C1, first filter module; C2, second filter module; Q1, first switch tube; Q2, second switch tube; S1, micro switch. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] Example 1

[0046] like Figure 1 As shown, an embodiment of the present invention provides a gas valve control circuit, which includes a power supply module, a voltage detection module and a power-off reset module.

[0047] Specifically, in an embodiment of the present invention, the power module is provided with a voltage output terminal, which is in turn grounded to the secondary coil of the dual-coil solenoid valve through a voltage-dividing resistor R7. The voltage detection module is provided with a voltage detection terminal, which is connected between the voltage-dividing resistor R7 and the secondary coil. The power-off reset module is connected in parallel with the voltage-dividing resistor R7; the power-off reset module has a state of being disconnected from the circuit, and a state of being connected in parallel with the voltage-dividing resistor R7 and unable to be disconnected from the parallel connection with the voltage-dividing resistor R7. After the power-off reset module is connected in parallel with the voltage-dividing resistor R7, the current flowing through the secondary coil increases, and the dual-coil solenoid valve closes.

[0048] During actual operation, when the cooker is ignited by electrical ignition and in normal operation, the voltage divider resistor R7 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.

[0049] Assume the solenoid valve is disconnected, meaning the secondary coil is damaged. Since the secondary coil is disconnected, there's no loop in the circuit, and the voltage divider resistor R7 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.

[0050] When the cooker reaches its scheduled time or the dry-boil prevention timer during normal operation, the user is alerted and can operate the power-off reset module, connecting it to the circuit. Once connected, the power-off reset module is connected in parallel with the voltage-dividing resistor R7 and cannot be disconnected from it. This parallel connection increases the current flowing through the secondary coil of the dual-coil solenoid valve, causing it to close properly, thus preventing fires and ensuring user safety.

[0051] In addition, after closing the dual-coil solenoid valve through the power-off reset module, the solenoid valve is always in the closed state and cannot be opened again. Therefore, the user needs to reset the power personally to cut off the current from the source to further ensure the user's safety.

[0052] Furthermore, in an optional embodiment of the present invention, the voltage detection module includes a control chip and a current-limiting resistor R6. Specifically, the control chip is provided with the voltage detection terminal, one end of the current-limiting resistor R6 is connected to the voltage detection terminal, and the other end of the current-limiting resistor R6 is connected between the voltage-dividing resistor R7 and the secondary coil.

[0053] Furthermore, in an optional embodiment of the present invention, the power-off reset module includes a first switch Q1, a microswitch S1, and a second switch Q2. Specifically, the control end of the first switch Q1 is connected to the voltage output end, the first end of the first switch Q1 is connected to the voltage output end, and the second end of the first switch Q1 is connected between the voltage divider resistor R7 and the secondary coil. The first end of the microswitch S1 is connected to the control end of the first switch Q1, and the second end of the microswitch S1 is connected to the second end of the first switch Q1. The control end of the second switch Q2 is connected between the voltage divider resistor R7 and the secondary coil via the first resistor R1, the first end of the second switch Q2 is connected to the first end of the microswitch S1, and the second end of the second switch Q2 is grounded. The first switch Q1 and the second switch Q2 may be transistors.

[0054] During normal operation, if microswitch S1 is off and first switch Q1 is not conducting, current flows from the power module through voltage divider resistor R7 and the secondary coil to ground. Due to the high resistance of voltage divider resistor R7, the current flowing through the solenoid valve is small, preventing it from closing. At this point, the base of second switch Q2 is effectively grounded and at a low level, preventing it from conducting.

[0055] During normal operation of the cooker, if microswitch S1 is closed, the base of the first switch Q1 is grounded and conductive. At this point, the voltage-dividing resistor R7 and the first resistor R1 are connected in parallel. The resistance of the first resistor R1 is much smaller than that of the voltage-dividing resistor R7, increasing the current flowing through the solenoid valve and closing it. At this point, a voltage divider exists across the first resistor R1, and this voltage divider turns on the second switch Q2. After the second switch Q2 turns on, the base of the first switch Q1 is effectively grounded, turning on the first switch Q1 as well. This creates an interlocking structure between the first and second switches Q1 and Q2.

[0056] After the interlocking structure is formed, even if the user accidentally operates the micro switch S1 and opens it, the first switch Q1 can still be turned on. The voltage divider resistor R7 and the first resistor R1 are in a parallel state. The current flowing through the solenoid valve remains large, and the solenoid valve cannot be opened again. Therefore, the user needs to reset the power supply personally to cut off the current at the source, further ensuring user safety.

[0057] Furthermore, in an optional embodiment of the present invention, the power-off reset module further includes a second resistor R2, one end of the second resistor R2 is connected to the control end of the first switch tube Q1, and the other end of the second resistor R2 is connected to the first end of the first switch tube Q1.

[0058] Furthermore, in an optional embodiment of the present invention, the power-off reset module further includes a third resistor R3, one end of which is connected to the control terminal of the first switch Q1, and the other end of which is connected to the first terminal of the second switch Q2. Furthermore, the first switch Q1 and the second switch Q2 may be transistors or MOS transistors. Those skilled in the art may modify these according to actual circumstances, as long as the same technical effect is achieved.

[0059] Furthermore, in an optional embodiment of the present invention, the power-off reset module further includes a fourth resistor R4, one end of which is connected to the second end of the first switch transistor Q1, and the other end of which is connected to the control end of the second switch transistor Q2. The resistance values ​​of the first resistor R1 and the fourth resistor R4 are significantly smaller than the resistance value of the voltage divider resistor R7.

[0060] Furthermore, in an optional embodiment of the present invention, the power-off reset module also includes a fifth resistor R5, which is connected between the voltage output end and the second resistor R2, and the first end of the first switch tube Q1 is connected between the second resistor R2 and the fifth resistor R5.

[0061] 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 divider resistor R7 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 R6 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.

[0062] When both the first filter module C1 and the fifth resistor R5 are provided, the capacitor of the first filter module C1 prevents voltage spikes and absorbs overvoltage spikes. The series-connected fifth resistor R5 acts as a damper, dissipating the energy of the overvoltage. Generally, their combined use suppresses circuit oscillation. Of course, those skilled in the art may also opt out of both the first filter module C1 and the fifth resistor R5 depending on actual circumstances.

[0063] 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.

[0064] 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.

[0065] 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 module is provided with a voltage output terminal, and the voltage output terminal is grounded to the auxiliary coil of the double-coil solenoid valve through a voltage dividing resistor (R7); A voltage detection module is provided with a voltage detection terminal, wherein the voltage detection terminal is connected between the voltage dividing resistor (R7) and the secondary coil; A power-off reset module is connected in parallel with the voltage-dividing resistor (R7); the power-off reset module has a state of not being connected to the circuit, and a state of being connected in parallel with the voltage-dividing resistor (R7) when the circuit is connected, and cannot be disconnected from the voltage-dividing resistor (R7); after the power-off reset module is connected in parallel with the voltage-dividing resistor (R7), the current flowing through the secondary coil increases, and the dual-coil solenoid valve is closed; The power-off reset module includes: a first switching tube (Q1), wherein a control end of the first switching tube (Q1) is connected to the voltage output end, a first end of the first switching tube (Q1) is connected to the voltage output end, and a second end of the first switching tube (Q1) is connected between the voltage dividing resistor (R7) and the secondary coil; A micro switch (S1), wherein a first end of the micro switch (S1) is connected to the control end of the first switch tube (Q1), and a second end of the micro switch (S1) is connected to the second end of the first switch tube (Q1); a second switch tube (Q2), wherein a control end of the second switch tube (Q2) is connected between the voltage divider resistor (R7) and the secondary coil via a first resistor (R1), a first end of the second switch tube (Q2) is connected to a first end of the micro switch (S1), and a second end of the second switch tube (Q2) is grounded; When the cooker is operating normally, the micro switch (S1) is closed, causing the first switch tube (Q1) and the second switch tube (Q2) to be turned on. The first switch tube (Q1) and the second switch tube (Q2) form an interlocking structure, and the solenoid valve cannot be opened again.

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 (R6), one end of the current limiting resistor (R6) is connected to the voltage detection end, and the other end of the current limiting resistor (R6) is connected between the voltage dividing resistor (R7) and the secondary coil.

3. The gas valve control circuit according to claim 1 or 2, characterized in that: The power-off reset module further includes: A second resistor (R2), one end of the second resistor (R2) is connected to the control end of the first switch tube (Q1), and the other end of the second resistor (R2) is connected to the first end of the first switch tube (Q1).

4. The gas valve control circuit according to claim 3, characterized in that: The power-off reset module further includes: A third resistor (R3), one end of the third resistor (R3) is connected to the control end of the first switch tube (Q1), and the other end of the third resistor (R3) is connected to the first end of the second switch tube (Q2).

5. The gas valve control circuit according to claim 4, characterized in that: The power-off reset module further includes: a fourth resistor (R4), one end of the fourth resistor (R4) being connected to the second end of the first switch tube (Q1), and the other end of the third resistor (R3) being connected to the control end of the second switch tube (Q2); and the resistance values ​​of the first resistor (R1) and the fourth resistor (R4) being smaller than the resistance value of the voltage divider resistor (R7).

6. The gas valve control circuit according to claim 5, characterized in that: The power-off reset module further includes: A fifth resistor (R5) is connected between the voltage output end and the second resistor (R2), and a first end of the first switch tube (Q1) is connected between the second resistor (R2) and the fifth resistor (R5).

7. The gas valve control circuit according to any one of claims 4 to 6, characterized in that: Also includes: The first filtering module (C1) is connected in parallel with a circuit formed by connecting the voltage dividing resistor (R7) and the secondary coil in series.

8. The gas valve control circuit according to any one of claims 4 to 6, characterized in that: Also includes: The second filtering module (C2) is connected in parallel with the secondary coil.

9. A burning appliance, characterized in that: include: The gas valve control circuit according to any one of claims 1 to 8.

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