Electromagnetic valve control circuit and gas equipment

Abstract

The utility model discloses an electromagnetic valve control circuit and gas equipment. The electromagnetic valve is electrically connected with the thermocouple, and the thermocouple is configured to output voltage based on the fact that the temperature of the environment is larger than a preset temperature threshold value so as to drive the electromagnetic valve to work. The electromagnetic valve control circuit comprises a controller, a switch branch and a current generation branch. The controller is configured to output a control signal. The switch branch is connected with the controller, and the switch branch is configured to be turned on in response to a control signal. The current generation branch is connected with the switch branch, the positive electrode of the thermocouple, the positive electrode of the electromagnetic valve and an input power source, the current generation branch is configured to respond to the input power source to generate first current when the switch branch is switched on, and the first current is input to the positive electrode of the thermocouple to offset the current output by the thermocouple and reduce the current flowing through the electromagnetic valve; therefore, the electromagnetic valve stops working. In this way, the intelligent control process of the gas equipment can be achieved.

Description

TECHNICAL FIELD

[0001] The embodiments of the present application relate to the technical field of electronic circuit, in particular to an electromagnetic valve control circuit and a gas equipment. BACKGROUND

[0002] At present, the gas equipment on the market is mostly ignited by a thermocouple igniter. The gas equipment includes a thermocouple and an electromagnetic valve, and the specific basic principle is as follows: when ignition starts, pressing the igniter can make the electromagnetic valve work, the gas passes through the electromagnetic valve, then the battery ignites the high-voltage bag, the gas is sprayed out, and the ignition is successful. At this time, the tip metal of the thermocouple is heated, the thermocouple generates a voltage, and this voltage is connected to the electromagnetic valve through a wire to maintain the work of the electromagnetic valve, so that even if the igniter is released, the gas can be continuously sprayed out to maintain combustion.

[0003] However, the intelligent control process of the gas equipment has not been realized at present. CONTENT OF THE UTILITY MODEL

[0004] The embodiments of the present application provide an electromagnetic valve control circuit and a gas equipment, which can realize the intelligent control process of the gas equipment.

[0005] In a first aspect, the embodiments of the present application provide an electromagnetic valve control circuit, the electromagnetic valve is electrically connected with a thermocouple, the thermocouple is configured to output a voltage based on the temperature of the environment being greater than a preset temperature threshold to drive the electromagnetic valve to work, and the electromagnetic valve control circuit comprises:

[0006] a controller configured to output a control signal;

[0007] a switch branch connected with the controller and configured to be turned on in response to the control signal;

[0008] a current generation branch connected with the switch branch, a positive electrode of the thermocouple, a positive electrode of the electromagnetic valve and an input power supply respectively, and configured to generate a first current in response to the input power supply when the switch branch is turned on, wherein the first current is input to the positive electrode of the thermocouple to offset the current output by the thermocouple and reduce the current flowing through the electromagnetic valve, so that the electromagnetic valve stops working.

[0009] In one or more embodiments, the current generation branch comprises a voltage division unit, a switch unit, a voltage generation unit and an impedance unit;

[0010] The voltage division unit is connected with the switch branch, the switch unit and the input power supply respectively, the input power supply, the impedance unit, the switch unit and the thermocouple are connected in series, and the voltage generation unit is connected with the switch unit and the impedance unit respectively;

[0011] The voltage dividing unit is configured to divide a voltage of the input power source to output a first voltage when the switch branch is turned on.

[0012] The switch unit is configured to be turned on in response to the first voltage.

[0013] The voltage generating unit is configured to work to generate a second voltage when the switch unit is turned on.

[0014] The impedance unit is configured to generate the first current based on the second voltage, the first current being input to the thermocouple through the switch unit.

[0015] In one or more embodiments, the voltage dividing unit includes a first resistor and a second resistor.

[0016] The first resistor and the second resistor are connected in series between the input power source and the switch branch, and a connection point between the first resistor and the second resistor is connected to the switch unit.

[0017] In one or more embodiments, the switch unit includes a first switch tube.

[0018] A first end of the first switch tube is connected to the voltage dividing unit, a second end of the first switch tube is connected to the voltage generating unit and the impedance unit respectively, and a third end of the first switch tube is connected to the thermocouple.

[0019] In one or more embodiments, the first switch tube is a PMOS tube.

[0020] The first end of the first switch tube is a gate of the PMOS tube, the second end of the first switch tube is a source of the PMOS tube, and the third end of the first switch tube is a drain of the PMOS tube.

[0021] In one or more embodiments, the voltage generating unit includes a second switch tube.

[0022] A first end of the second switch tube is connected to the impedance unit and the switch unit respectively, a second end of the second switch tube is connected to the input power source, and a third end of the second switch tube is connected to the voltage dividing unit and the switch unit respectively.

[0023] The second switch tube is turned on when the switch unit is turned on to generate the first voltage between the second end and the first end of the second switch tube.

[0024] In one or more embodiments, the second switch tube is a PNP type triode.

[0025] The first end of the second switch tube is a base of a PNP type triode, the second end of the second switch tube is an emitter of the PNP type triode, and the third end of the second switch tube is a collector of the PNP type triode.

[0026] The first voltage is a voltage between the emitter and the base of the PNP type triode when the PNP type triode is turned on.

[0027] In one or more embodiments, the impedance unit includes a third resistor, and the current generation branch further includes a fourth resistor.

[0028] The third resistor is connected between the first end and the second end of the voltage generation unit, and the fourth resistor is connected between the switch unit and the positive electrode of the thermocouple.

[0029] In one or more embodiments, the switch branch includes a third switch tube, a fifth resistor, and a sixth resistor.

[0030] The fifth resistor and the sixth resistor are connected between the controller and the ground, a connection point between the fifth resistor and the sixth resistor is connected to the first end of the third switch tube, the second end of the third switch tube is grounded, and the third end of the third switch tube is connected to the current generation branch.

[0031] In a second aspect, the embodiments of the present application provide a gas equipment, which includes a thermocouple, a solenoid valve, and a solenoid valve control circuit as described above.

[0032] The solenoid valve control circuit of the embodiments of the present application includes a controller, a switch branch, and a current generation branch. When it is necessary to automatically control the solenoid valve to stop working, first, the controller outputs a control signal to the switch branch to make the switch branch conduct. Then, the current generation branch generates a first current. The combination of the first current and the current output by the thermocouple is the current flowing through the solenoid valve. Since the directions of the first current and the current output by the thermocouple are opposite, the current flowing through the solenoid valve is equivalent to being reduced, and thus the solenoid valve can stop working. Therefore, the intelligent control process of the solenoid valve is realized. When the solenoid valve and the thermocouple are arranged in the gas equipment, the intelligent control process of the gas equipment is realized. BRIEF DESCRIPTION OF DRAWINGS

[0033] One or more embodiments are exemplarily illustrated by pictures in the drawings corresponding to the embodiments, and the exemplarily illustrations do not configure limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements.

[0034] Figure 1 is a schematic diagram of a composition block diagram of the solenoid valve control circuit provided by the embodiments of the present application Figure 1 .

[0035] Figure 2 is a component block diagram of the electromagnetic valve control circuit provided by the embodiment of the present application Figure 2 ;

[0036] Figure 3 is a circuit structure diagram corresponding to the component block diagram shown in Figure 2 . DETAILED DESCRIPTION

[0037] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and in detail below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the present application and should not be used to limit the present application.

[0038] It should be noted that when one element is described as being “connected” to another element, it can be directly connected to the other element or one or more intermediate elements can be present therebetween.

[0039] In addition, the technical features involved in each of the embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0040] Please refer to Figure 1 , Figure 1 is a component block diagram of the electromagnetic valve control circuit provided by the embodiment of the present application. The electromagnetic valve 300 is electrically connected to the thermocouple 200, and the thermocouple 200 is configured to output a voltage based on the temperature of the environment in which it is located being greater than a preset temperature threshold to drive the electromagnetic valve 300 to work. Specifically, the positive electrode of the thermocouple 200 is connected to the positive electrode of the electromagnetic valve 300, and the negative electrode of the thermocouple 200 and the negative electrode of the electromagnetic valve 300 are both grounded GND. When the temperature of the environment in which the thermocouple 300 is located is greater than the preset temperature threshold, the thermocouple 300 outputs a voltage to the electromagnetic valve 300 to supply power to the electromagnetic valve 300, and the electromagnetic valve 300 can be driven to work. The current output by the thermocouple 200 is a second current I 2. The preset temperature threshold is a temperature threshold set in advance, which can be set based on the actual application scenario, and the embodiments of the present application do not make specific limitations thereto.

[0041] The electromagnetic valve control circuit 100 includes a controller 10, a switch branch 20 and a current generation branch 30. The switch branch 20 is connected to the controller 10, and the current generation branch 30 is connected to the switch branch 20, the positive electrode of the thermocouple 200, the positive electrode of the electromagnetic valve 300 and the input power VIN respectively.

[0042] Specifically, the controller 10 is configured to output a control signal. The switch branch 20 is configured to be turned on in response to the control signal. The current generating branch 30 is configured to generate a first current I1 in response to the input power Vin when the switch branch 20 is turned on, wherein the first current I1 is input to the anode of the thermocouple 200 to offset the current output by the thermocouple 200 and reduce the current flowing through the electromagnetic valve 300, so that the electromagnetic valve 300 stops working.

[0043] In the related art, for a gas device provided with a thermocouple 200 and an electromagnetic valve 300, the electromagnetic valve 300 can be turned on by pressing an igniter in the gas device, the gas can pass through the electromagnetic valve 300, and then the battery in the gas device ignites the high-pressure package, the gas is sprayed out, and the ignition is successful. At this time, the tip metal of the thermocouple 200 is heated, the thermocouple 200 generates a voltage, and this voltage is connected to the electromagnetic valve 300 through a wire to maintain the electromagnetic valve 300 working, so that even if the igniter is released, the gas can be continuously sprayed out to maintain combustion. However, for such a gas device, when it is necessary to turn off the gas, manual selection of a switch is required to achieve, and intelligent control process cannot be achieved.

[0044] In the present application, the controller 10 outputs a control signal to the switch branch 20 to turn on the switch branch 20. Then, the current generating branch 30 generates a first current I1. Wherein the combination of the first current I1 and the current (i.e. second current I2) output by the thermocouple 200 is the current flowing through the electromagnetic valve 300, and since the first current I1 and the second current I2 are in opposite directions, it is equivalent to the current flowing through the electromagnetic valve 300 being reduced (i.e. the current flowing through the electromagnetic valve 300 is reduced from I2 to I2-I1), and then the electromagnetic valve 300 can stop working. Thus, the automatic stop working process of the electromagnetic valve is achieved, that is, when it is necessary to turn off the gas, the automatic gas turning-off process can be achieved through the above process.

[0045] Further, when the electromagnetic valve 300 and the thermocouple 200 are provided in the gas device, the intelligent control process of the gas device is achieved, for example, in some embodiments, a timing function can be configured in the gas device, when the timing length reaches, the controller 10 can output a control signal to control the electromagnetic valve 300 to stop working, that is, the process of automatically turning off the gas at a certain time can be achieved.

[0046] In some embodiments, as shown in Figure 2 The current generating branch 30 includes a voltage dividing unit 31, a switch unit 32, a voltage generating unit 33, and an impedance unit 34.

[0047] The voltage dividing unit 31 is connected with the switch branch 20, the switch unit 32 and the input power source VIN respectively, the input power source VIN, the impedance unit 34, the switch unit 32 and the thermocouple 200 are connected in series, and the voltage generating unit 33 is connected with the switch unit 32 and the impedance unit 34 respectively.

[0048] Specifically, the voltage dividing unit 31 is configured to divide the voltage of the input power source VIN when the switch branch 20 is turned on to output a first voltage. The switch unit 32 is configured to be turned on in response to the first voltage. The voltage generating unit 33 is configured to work when the switch unit 32 is turned on to generate a second voltage. The impedance unit 34 is configured to generate a first current I1 based on the second voltage, and the first current I1 is input to the thermocouple 200 through the switch unit 32.

[0049] In actual application, first, the controller 10 outputs a control signal to the switch branch 20 to make the switch branch 20 conduct. The input power source VIN, the voltage dividing unit 31 and the switch branch 20 form a loop, and the voltage of the input power source VIN is divided by the voltage dividing unit 31 to output a first voltage to the switch unit 32. The switch unit 32 is turned on, and the input power source VIN, the impedance unit 34, the switch unit 32 and the thermocouple 200 form a loop to output a voltage to the voltage generating unit 33, and the voltage generating unit 33 works and generates a second voltage. The second voltage acts on both ends of the impedance unit 32, and the ratio of the second voltage to the resistance value of the impedance unit 32 is the first current I1. Since the second voltage and the resistance value of the impedance unit 32 are both fixed values, the first current I1 is also a constant value, which can reliably control the electromagnetic valve 300 to stop working.

[0050] Please refer to Figure 3 , Figure 3 for a circuit structure corresponding to the block diagram shown in Figure 2 . As shown in Figure 3 , the voltage dividing unit 31 includes a first resistor R1 and a second resistor R2.

[0051] The first resistor R1 and the second resistor R2 are connected in series between the input power source VIN and the switch branch 20, and the connection point between the first resistor R1 and the second resistor R2 is connected with the switch unit 32.

[0052] In this embodiment, the switch unit 32 includes a first switch tube Q1.

[0053] The first end of the first switch tube Q1 is connected with the voltage dividing unit 31, the second end of the first switch tube Q1 is connected with the voltage generating unit 33 and the impedance unit 34 respectively, and the third end of the first switch tube Q1 is connected with the thermocouple 200.

[0054] In this embodiment, the first switch Q1 is taken as an example of a PMOS transistor. The gate of the PMOS transistor is the first terminal of the first switch Q1, the source of the PMOS transistor is the second terminal of the first switch Q1, and the drain of the PMOS transistor is the third terminal of the first switch Q1.

[0055] In addition, the first switch Q1 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0056] In this embodiment, the voltage generating unit 33 includes a second switch Q2.

[0057] In this embodiment, the first terminal of the second switch Q2 is connected to the impedance unit 34 and the switch unit 32, respectively, the second terminal of the second switch Q2 is connected to the input power VIN, and the third terminal of the second switch Q2 is connected to the voltage dividing unit 31 and the switch unit 32, respectively.

[0058] In this embodiment, the second switch Q2 is taken as an example of an NPN transistor. The base of the NPN transistor is the first terminal of the second switch Q2, the emitter of the NPN transistor is the second terminal of the second switch Q2, and the collector of the NPN transistor is the third terminal of the second switch Q2. The first voltage is the voltage between the emitter and the base of the second switch Q2 when the second switch Q2 is turned on.

[0059] In addition, the second switch Q2 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0060] In addition, the second switch Q2 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0061] In this embodiment, the impedance unit 34 includes a third resistor R3, and the current generating branch 30 further includes a fourth resistor R4.

[0062] In this embodiment, the third resistor R3 is connected between the first terminal and the second terminal of the voltage generating unit 33, and the fourth resistor R4 is connected between the switch unit 32 and the positive electrode of the thermocouple 200. The fourth resistor R4 is used for voltage division to prevent the voltage on the thermocouple 200 from being too large and being damaged, thereby improving the stability and reliability of the thermocouple 200.

[0063] In this embodiment, the switch branch 20 comprises a third switch Q3, a fifth resistor R5 and a sixth resistor R6.

[0064] In this embodiment, the fifth resistor R5 and the sixth resistor R6 are connected between the controller 10 and the ground GND, the connection point between the fifth resistor R5 and the sixth resistor R6 is connected to the first terminal of the third switch Q3, the second terminal of the third switch Q3 is connected to the ground GND, and the third terminal of the third switch Q3 is connected to the current generation branch 30.

[0065] The fifth resistor R5 and the sixth resistor R6 divide the voltage of the control signal output by the controller 10, and the voltage division of the control signal on the sixth resistor R6 drives the third switch Q3 to turn on. The sixth resistor R6 can also function as a discharge resistor when the third switch Q3 is turned off, ensuring that the third switch Q3 can be reliably turned off.

[0066] In this embodiment, the third switch Q3 is taken as an example of a PNP type triode. The base of the PNP type triode is the first terminal of the third switch Q3, the emitter of the PNP type triode is the second terminal of the third switch Q3, and the collector of the PNP type triode is the third terminal of the third switch Q3.

[0067] In addition, the third switch Q3 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate-commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, a MOS-controlled thyristor (MCT) device, etc.

[0068] The principles of the circuit structure shown in FIG. 1 will be described below. Figure 3

[0069] ​Firstly, the controller 10 outputs a control signal. The control signal is input to the third switch tube Q3 through the fifth resistor R5, and the third switch tube Q3 is turned on. The input power Vin, the first resistor R1, the second resistor R2 and the third switch tube Q3 form a loop, and the voltage on the second resistor R2 after the input power Vin is divided by the first resistor R1 and the second resistor R2 is a first voltage, which is input to the first switch tube Q1. The first switch tube Q1 is turned on, the input power Vin, the third resistor R3, the first switch tube Q1, the fourth resistor R4 and the thermocouple 200 form a loop, thereby generating a voltage to drive the second switch tube Q2, so that the second switch tube Q2 is turned on (corresponding to the working of the voltage generating unit 33). After the second switch tube Q2 is turned on, since the second switch tube Q2 is a triode in this embodiment, the voltage between the base and the emitter of the second switch tube Q2 is a fixed voltage, such as 0.7V. Then, the ratio of this voltage to the third resistor R3 is the first current I1. The first current I1 is a current opposite to the second current I2. Thus, the current flowing through the electromagnetic valve 300 is reduced from the second current I1 to the difference between the second current I2 and the first current I1, and the electromagnetic valve 300 stops working. Thus, the process of automatically stopping the electromagnetic valve is realized, that is, when it is necessary to close the gas, the process of automatically closing the gas can be realized through the above process. Further, when the electromagnetic valve 300 and the thermocouple 200 are arranged in the gas equipment, the intelligent control process of the gas equipment is realized.

[0070] The embodiment of the present application also provides a gas equipment. The gas equipment comprises a thermocouple, an electromagnetic valve and the electromagnetic valve control circuit 100 in any embodiment of the present application.

[0071] The above is only an embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent flow transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

[0072] The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; the technical features of the above embodiments or different embodiments can also be combined under the idea of the present application, and the steps can be implemented in any order. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electromagnetic valve control circuit, characterized by comprising: The electromagnetic valve is electrically connected with a thermocouple, the thermocouple is configured to output a second current to drive the electromagnetic valve to work based on the temperature of the environment being greater than a preset temperature threshold, and the electromagnetic valve control circuit comprises: a controller configured to output a control signal; a switch branch connected with the controller and configured to be turned on in response to the control signal; a current generation branch connected with the switch branch, a positive electrode of the thermocouple, a positive electrode of the electromagnetic valve and an input power supply respectively and configured to generate a first current in response to the input power supply when the switch branch is turned on, wherein the first current is opposite in current direction to the second current.

2. The solenoid valve control circuit according to claim 1, characterized by The current generation branch comprises a voltage division unit, a switch unit, a voltage generation unit and an impedance unit; the voltage division unit is connected with the switch branch, the switch unit and the input power supply respectively, the input power supply, the impedance unit, the switch unit and the thermocouple are connected in series, and the voltage generation unit is connected with the switch unit and the impedance unit respectively; the voltage division unit is configured to divide the voltage of the input power supply to output a first voltage when the switch branch is turned on; the switch unit is configured to be turned on in response to the first voltage; the voltage generation unit is configured to work to generate a second voltage when the switch unit is turned on; the impedance unit is configured to generate the first current based on the second voltage, and the first current is input to the thermocouple through the switch unit.

3. The solenoid valve control circuit according to claim 2, characterized by The voltage division unit comprises a first resistor and a second resistor; the first resistor and the second resistor are connected in series between the input power supply and the switch branch, and a connection point between the first resistor and the second resistor is connected with the switch unit.

4. The solenoid valve control circuit according to claim 2, characterized by The switch unit comprises a first switch tube; a first end of the first switch tube is connected with the voltage division unit, a second end of the first switch tube is connected with the voltage generation unit and the impedance unit respectively, and a third end of the first switch tube is connected with the thermocouple.

5. The solenoid valve control circuit according to claim 4, characterized in that, The first switch tube is a PMOS tube; the first end of the first switch tube is a gate of the PMOS tube, the second end of the first switch tube is a source of the PMOS tube, and the third end of the first switch tube is a drain of the PMOS tube.

6. The solenoid valve control circuit according to claim 2, wherein The voltage generation unit comprises a second switch tube; a first end of the second switch tube is connected with the impedance unit and the switch unit respectively, a second end of the second switch tube is connected with the input power supply, and a third end of the second switch tube is connected with the voltage division unit and the switch unit respectively; wherein the second switch tube is turned on to generate the first voltage between the second end and the first end of the second switch tube when the switch unit is turned on.

7. The solenoid valve control circuit according to claim 6, characterized in that, The second switch tube is a PNP type triode; the first end of the second switch tube is a base of the PNP type triode, the second end of the second switch tube is an emitter of the PNP type triode, and the third end of the second switch tube is a collector of the PNP type triode. The first voltage is a voltage between an emitter and a base of the PNP type triode when the PNP type triode is turned on.

8. The solenoid valve control circuit according to claim 2, characterized by The impedance unit comprises a third resistor, and the current generation branch further comprises a fourth resistor; The third resistor is connected between the first end and the second end of the voltage generation unit, and the fourth resistor is connected between the switch unit and the positive electrode of the thermocouple.

9. The solenoid valve control circuit according to claim 1, characterized by The switch branch comprises a third switch tube, a fifth resistor and a sixth resistor; The fifth resistor and the sixth resistor are connected between the controller and the ground, a connection point between the fifth resistor and the sixth resistor is connected with a first end of the third switch tube, a second end of the third switch tube is grounded, and a third end of the third switch tube is connected with the current generation branch.

10. A gas appliance characterised in that, The electromagnetic valve control circuit comprises a thermocouple, an electromagnetic valve and the electromagnetic valve control circuit according to any one of claims 1-9.

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