Gas stove thermocouple solenoid valve driving circuit and gas stove

Abstract

The utility model discloses a thermocouple electromagnetic valve driving circuit of a gas stove and the gas stove. The thermocouple solenoid valve driving circuit for the gas stove comprises a battery voltage sampling circuit which is connected between an MCU (Microprogrammed Control Unit) of the gas stove and a battery of the gas stove and is used for detecting the real-time voltage V1 of the battery and transmitting the real-time voltage V1 to the MCU; the thermocouple electromagnetic valve boost voltage sampling circuit is connected between the MCU and the thermocouple electromagnetic valve and is used for detecting the real-time voltage V2 of the thermocouple electromagnetic valve and transmitting the real-time voltage V2 to the MCU; the thermocouple electromagnetic valve closing boost charging circuit is connected between the MCU and the battery and is used for charging when the thermocouple electromagnetic valve is in a valve closing state; and one end of the valve closing control circuit is connected with an MCU (Microprogrammed Control Unit) of the gas stove, and the other end of the valve closing control circuit is connected with the thermocouple electromagnetic valve and the thermocouple electromagnetic valve closing boosting charging circuit and is used for controlling the thermocouple electromagnetic valve to be switched off.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a thermocouple electromagnetic valve driving circuit of a gas stove and a gas stove. Background Art

[0002] The flameout protection structures of gas stoves on the market are mainly divided into ion flameout protection structures and thermocouple flameout protection structures. The thermocouple flameout protection structure is a flameout protection method widely used in the industry. The principle of the thermocouple flameout protection structure is to use the characteristic of the thermocouple probe generating voltage after being heated during the combustion process of the stove, so as to maintain the continuous opening of the solenoid valve. When the stove is turned off, as the thermocouple probe continues to cool down, the maintenance voltage of the solenoid valve gradually decreases until the solenoid valve is closed when the maintenance voltage is insufficient, thereby achieving the flameout protection function. This type of flameout protection does not have the ability to intelligently shut down the stove at a fixed time, and cannot meet the needs of gas stove upgrades.

[0003] Therefore, a gas stove thermocouple solenoid valve driving circuit is urgently needed to solve the above problem. Utility Model Content

[0004] The utility model aims to solve one of the problems existing in the existing related technologies to at least a certain extent. To this end, the utility model proposes a gas stove thermocouple solenoid valve drive circuit, which can control the time of closing the thermocouple solenoid valve to meet the needs of users.

[0005] The above purpose is achieved through the following technical solutions:

[0006] A gas stove thermocouple solenoid valve driving circuit, comprising:

[0007] A battery voltage sampling circuit is connected between the MCU of the gas stove and the battery of the gas stove, and is used to detect the real-time voltage V1 of the battery and transmit it to the MCU;

[0008] A thermocouple solenoid valve boost voltage sampling circuit is connected between the MCU and the thermocouple solenoid valve, and is used to detect the real-time voltage V2 of the thermocouple solenoid valve and transmit it to the MCU;

[0009] A thermocouple solenoid valve closed valve boost charging circuit is connected between the MCU and the battery and is used for charging when the thermocouple solenoid valve is in a closed valve state;

[0010] The valve closing control circuit has one end connected to the MCU of the gas stove and the other end connected to the thermocouple solenoid valve and the thermocouple solenoid valve closing valve boost charging circuit, and is used to control the thermocouple solenoid valve to disconnect.

[0011] Optionally, the battery voltage sampling circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C8, wherein the third resistor R3 and the first capacitor C8 form a first RC circuit, and the first RC circuit is used to reduce interference of attenuated high-frequency signals.

[0012] Optionally, the thermocouple solenoid valve boost voltage sampling circuit includes a fourth resistor R6, a fifth resistor R13, a sixth resistor R14 and a second capacitor C9, the sixth resistor R14 and the second capacitor C9 form a second RC circuit, and the second RC circuit is used to reduce interference of attenuated high-frequency signals.

[0013] Optionally, the thermocouple solenoid valve closing boost charging circuit includes an inductor L1, a switch tube Q3, a diode D1, a seventh resistor R7, an eighth resistor R12 and a capacitor CE1.

[0014] Optionally, the thermocouple solenoid valve includes a first thermocouple solenoid valve J1 , and the valve closing control circuit includes a first valve closing control circuit, and the first valve closing control circuit is connected to the first thermocouple solenoid valve J1 .

[0015] Optionally, the first valve closing control circuit includes a first transistor Q4 and a first MOS transistor Q1 connected to each other, the first transistor Q4 is connected to the MCU, and the first MOS transistor Q1 is connected to the first thermocouple solenoid valve J1.

[0016] Optionally, the thermocouple solenoid valve further includes a second thermocouple solenoid valve J2, the first thermocouple solenoid valve J1 and the second thermocouple solenoid valve J2 are connected to each other, and the valve closing control circuit further includes a second valve closing control circuit, and the second valve closing control circuit is connected to the second thermocouple solenoid valve J2.

[0017] Optionally, the second valve closing control circuit includes a second transistor Q5 and a second MOS transistor Q2 connected to each other, the second transistor Q5 is connected to the MCU, and the second MOS transistor Q2 is connected to the second thermocouple solenoid valve J2.

[0018] Another aspect of the utility model provides a gas stove, comprising the above-mentioned gas stove thermocouple solenoid valve driving circuit, wherein the gas stove thermocouple solenoid valve driving circuit is operated by adopting the above-mentioned control method of the gas stove thermocouple solenoid valve driving circuit.

[0019] Compared with the prior art, the utility model has at least the following beneficial effects:

[0020] The utility model provides a gas stove thermocouple solenoid valve driving circuit, which obtains the charging voltage Vk of the thermocouple solenoid valve closing valve boost charging circuit by calculating the difference between the real-time voltage V1 of the battery detected by the battery voltage sampling circuit and the real-time voltage V2 of the thermocouple solenoid valve detected by the thermocouple solenoid valve boost voltage sampling circuit, and presets the charging voltage V0 of the thermocouple solenoid valve closing valve boost charging circuit. When Vk reaches V0, it indicates that the preset time point for closing the thermocouple solenoid valve has been reached. At this time, the MCU outputs a signal to control the valve closing control circuit to close the thermocouple solenoid valve. By setting different preset voltages V0, the time for closing the thermocouple solenoid valve is controlled to meet the needs of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a gas stove thermocouple solenoid valve driving circuit provided by a specific embodiment of the utility model;

[0022] Figure 2 It is a structural schematic diagram of a gas stove hot MUC provided by a specific embodiment of the utility model. DETAILED DESCRIPTION

[0023] The following examples illustrate the present invention, but the present invention is not limited by these examples. Modifications to the specific implementation of the present invention or equivalent replacement of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed for protection in the present invention.

[0024] Please refer to Figure 1 and Figure 2 The utility model provides a gas stove thermocouple solenoid valve driving circuit, including a battery voltage sampling circuit, a thermocouple solenoid valve boost voltage sampling circuit and a valve closing control circuit. The battery voltage sampling circuit is connected between the MCU of the gas stove and the battery of the gas stove, and is used to detect the real-time voltage V1 of the battery and transmit it to the MCU. The thermocouple solenoid valve boost voltage sampling circuit is connected between the MCU and the thermocouple solenoid valve, and is used to detect the real-time voltage V2 of the thermocouple solenoid valve and transmit it to the MCU. The thermocouple solenoid valve valve closing boost charging circuit is connected between the MCU and the battery, and is used to charge when the thermocouple solenoid valve is in a valve closing state. One end of the valve closing control circuit is connected to the MCU of the gas stove, and the other end is connected to the thermocouple solenoid valve and the thermocouple solenoid valve valve closing boost charging circuit, and is used to control the thermocouple solenoid valve to be disconnected.

[0025] Specifically, the control method of the gas stove thermocouple solenoid valve driving circuit includes the following steps:

[0026] S1: Detect the real-time voltage V1 of the battery through the battery voltage sampling circuit, and detect the real-time voltage V2 of the thermocouple solenoid valve through the thermocouple solenoid valve boost voltage sampling circuit;

[0027] S2: MCU calculates and obtains the charging voltage Vk=V1-V2 of the thermocouple solenoid valve closing valve boost charging circuit;

[0028] S3: MCU determines whether Vk=V0. If so, the MCU outputs a signal to control the valve closing control circuit to close the thermocouple solenoid valve. If not, it returns to S1.

[0029] Among them, V0 is the preset voltage set by the MCU.

[0030] The utility model provides a gas stove thermocouple solenoid valve driving circuit, which obtains the charging voltage Vk of the thermocouple solenoid valve closing valve boost charging circuit by calculating the difference between the real-time voltage V1 of the battery detected by the battery voltage sampling circuit and the real-time voltage V2 of the thermocouple solenoid valve detected by the thermocouple solenoid valve boost voltage sampling circuit, and presets the charging voltage V0 of the thermocouple solenoid valve closing valve boost charging circuit. When Vk reaches V0, it indicates that the preset time point for closing the thermocouple solenoid valve has been reached. At this time, the MCU outputs a signal to control the valve closing control circuit to close the thermocouple solenoid valve. By setting different preset voltages V0, the time for closing the thermocouple solenoid valve is controlled to meet the needs of users.

[0031] Optionally, the battery voltage sampling circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C8, wherein the third resistor R3 and the first capacitor C8 form a first RC circuit, and the first RC circuit is used to reduce the interference of the attenuated high-frequency signal to improve the accuracy of the acquired real-time voltage V1 of the battery.

[0032] Optionally, the thermocouple solenoid valve boost voltage sampling circuit includes a fourth resistor R6, a fifth resistor R13, a sixth resistor R14 and a second capacitor C9. The sixth resistor R14 and the second capacitor C9 form a second RC circuit. The second RC circuit is used to reduce the interference of the attenuated high-frequency signal to improve the accuracy of the real-time voltage V2 of the thermocouple solenoid valve.

[0033] Optionally, the thermocouple solenoid valve closed valve boost charging circuit includes an inductor L1, a switch tube Q3, a diode D1, a seventh resistor R7, an eighth resistor R12 and a capacitor CE1. Specifically, through the topological structure of the BOOST circuit, the switch tube Q3 is controlled to be turned on and off by outputting a switch signal (e.g., outputting a high level) through the V_PWM port of the MCU, so as to realize the boost charging of the capacitor CE1.

[0034] Optionally, the thermocouple solenoid valve includes a first thermocouple solenoid valve J1 , and the valve closing control circuit includes a first valve closing control circuit, which is connected to the first thermocouple solenoid valve J1 to control the closing of the first thermocouple solenoid valve J1 .

[0035] Optionally, the first valve closing control circuit includes a first transistor Q4 and a first MOS transistor Q1 connected to each other, the first transistor Q4 is connected to the SW_L port of the MCU, and the first MOS transistor Q1 is connected to the first thermocouple solenoid valve J1.

[0036] Specifically, the MCU outputs a signal to control the valve closing control circuit to close the thermocouple solenoid valve, including the following steps:

[0037] The MCU outputs a switch signal (e.g., outputs a high level) to turn on the first transistor Q4, thereby turning on the first MOS tube Q1, so that the thermocouple solenoid valve closes the valve and discharges the boost charging circuit. The first thermocouple solenoid valve J1 receives a reverse current (current such as Figure 1 The current flows in the direction indicated by the arrow B1. Figure 1 When the water flows in the direction indicated by the middle arrow A1, the second thermocouple solenoid valve J1 opens and then closes.

[0038] Optionally, the thermocouple solenoid valve also includes a second thermocouple solenoid valve J2, the first thermocouple solenoid valve J1 and the second thermocouple solenoid valve J2 are interconnected, and the valve closing control circuit also includes a second valve closing control circuit, which is connected to the second thermocouple solenoid valve J2 to control the closing of the second thermocouple solenoid valve J2.

[0039] Optionally, the second valve closing control circuit includes a second transistor Q5 and a second MOS transistor Q2 connected to each other, the second transistor Q5 is connected to the MCUSW_R port, and the second MOS transistor Q2 is connected to the second thermocouple solenoid valve J2.

[0040] Specifically, the MCU outputs a high level to turn on the second transistor Q5, and then turns on the second MOS tube Q2, so that the thermocouple solenoid valve closed valve boost charging circuit discharges, and the second thermocouple solenoid valve J2 receives a reverse current (current such as Figure 1 The current flows in the direction indicated by the arrow B2. Figure 1 When the water flows in the direction indicated by the middle arrow A2, the second thermocouple solenoid valve J2 opens and then closes.

[0041] On the other hand, the utility model provides a gas stove, comprising the above-mentioned gas stove thermocouple solenoid valve driving circuit, and the gas stove thermocouple solenoid valve driving circuit adopts the above-mentioned gas stove thermocouple solenoid valve driving circuit control method to operate.

[0042] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A gas stove thermocouple solenoid valve drive circuit, characterized in that: include: A battery voltage sampling circuit is connected between the MCU of the gas stove and the battery of the gas stove, and is used to detect the real-time voltage V1 of the battery and transmit it to the MCU; A thermocouple solenoid valve boost voltage sampling circuit is connected between the MCU and the thermocouple solenoid valve, and is used to detect the real-time voltage V2 of the thermocouple solenoid valve and transmit it to the MCU; A thermocouple solenoid valve closed valve boost charging circuit is connected between the MCU and the battery and is used for charging when the thermocouple solenoid valve is in a closed valve state; The valve closing control circuit has one end connected to the MCU of the gas stove and the other end connected to the thermocouple solenoid valve and the thermocouple solenoid valve closing valve boost charging circuit, and is used to control the thermocouple solenoid valve to disconnect.

2. The gas stove thermocouple solenoid valve driving circuit according to claim 1, characterized in that: The battery voltage sampling circuit includes a first resistor R1, a second resistor R2, a third resistor R3 and a first capacitor C8, wherein the third resistor R3 and the first capacitor C8 form a first RC circuit, and the first RC circuit is used to reduce the interference of attenuating high-frequency signals.

3. The gas stove thermocouple solenoid valve driving circuit according to claim 1, characterized in that: The thermocouple solenoid valve boost voltage sampling circuit includes a fourth resistor R6, a fifth resistor R13, a sixth resistor R14 and a second capacitor C9. The sixth resistor R14 and the second capacitor C9 form a second RC circuit, and the second RC circuit is used to reduce the interference of attenuated high-frequency signals.

4. The gas stove thermocouple solenoid valve driving circuit according to claim 1, characterized in that: The thermocouple solenoid valve closing valve boost charging circuit includes an inductor L1, a switch tube Q3, a diode D1, a seventh resistor R7, an eighth resistor R12 and a capacitor CE1.

5. The gas stove thermocouple solenoid valve driving circuit according to any one of claims 1 to 4, characterized in that: The thermocouple solenoid valve includes a first thermocouple solenoid valve J1 , and the valve closing control circuit includes a first valve closing control circuit, and the first valve closing control circuit is connected to the first thermocouple solenoid valve J1 .

6. The gas stove thermocouple solenoid valve driving circuit according to claim 5, characterized in that: The first valve closing control circuit includes a first transistor Q4 and a first MOS transistor Q1 which are connected to each other. The first transistor Q4 is connected to the MCU, and the first MOS transistor Q1 is connected to the first thermocouple solenoid valve J1.

7. The gas stove thermocouple solenoid valve driving circuit according to claim 5, characterized in that: The thermocouple solenoid valve further includes a second thermocouple solenoid valve J2. The first thermocouple solenoid valve J1 and the second thermocouple solenoid valve J2 are connected to each other. The valve closing control circuit further includes a second valve closing control circuit. The second valve closing control circuit is connected to the second thermocouple solenoid valve J2.

8. The gas stove thermocouple solenoid valve driving circuit according to claim 7, characterized in that: The second valve closing control circuit includes a second transistor Q5 and a second MOS transistor Q2 which are connected to each other. The second transistor Q5 is connected to the MCU, and the second MOS transistor Q2 is connected to the second thermocouple solenoid valve J2.

9. A gas stove, characterized in that: The invention comprises a gas stove thermocouple solenoid valve driving circuit as described in any one of claims 1 to 8.

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