CN116221479A - A control circuit and electronic equipment of a solenoid valve - Google Patents

Abstract

The invention provides a solenoid valve control circuit and electronic equipment, including: a controller, a step-down circuit, a starting circuit, and a switch circuit; the output end of the controller is electrically connected to the control end of the switch circuit, and the The input end of the step-down circuit is used to connect to the power supply, the output end of the step-down circuit is used to connect the solenoid valve, the input end of the start-up circuit is electrically connected to the power supply, and the output end of the start-up circuit is connected to the The solenoid valve is electrically connected, the control end of the starting loop is electrically connected to the power supply, the control end of the starting loop is electrically connected to the input end of the switching loop, and the output end of the switching loop is grounded, which solves the problem of existing The solenoid valve has a serious problem of heating when it is working.

Description

A control circuit and electronic equipment for a solenoid valve

technical field

The invention relates to the field of electronic power, in particular to a control circuit and electronic equipment of a solenoid valve.

Background technique

At present, most applications such as car comfort massage system and smart home use single voltage to drive the solenoid valve to open. The solenoid valve works at the rated voltage for a long time. Due to the long-term power-on, the solenoid valve will generate serious heat, which will not only affect its own life, but also may affect the increase in the heat of the electronic control unit circuit; if it is serious, it may cause the entire control unit to fail.

In view of this, propose this application.

Contents of the invention

The invention discloses a control circuit and electronic equipment of a solenoid valve, aiming at solving the problem of serious heat generation of the existing solenoid valve during operation.

The first embodiment of the present invention provides a control circuit for a solenoid valve, including: a controller, a step-down circuit, a start-up circuit, and a switch circuit;

The output end of the controller is electrically connected to the control end of the switch circuit, the input end of the step-down circuit is used to connect to the power supply, the output end of the step-down circuit is used to connect the solenoid valve, and the start-up circuit The input terminal is electrically connected to the power supply, the output terminal of the starting circuit is electrically connected to the solenoid valve, the control terminal of the starting circuit is electrically connected to the power supply, the control terminal of the starting circuit is connected to the switch circuit The input end of the switch circuit is electrically connected, and the output end of the switch circuit is grounded;

The controller is configured to implement the following steps by executing its internally stored computer program:

When the solenoid valve opening command is received, the switching circuit is controlled to conduct, so that the power supply supplies power to the solenoid valve through the starting circuit;

After receiving the timing signal from the timing unit, the switching loop is controlled to be turned off, so that the power supply supplies power to the solenoid valve through the step-down loop.

Preferably, the switch loop is configured to be turned on when receiving a high-level signal, so that the start-up loop is short-circuited to the step-down loop.

The switching loop is configured to be turned off when receiving a low level signal, thereby causing the startup loop to be turned off.

Preferably, the switch loop includes: a triode, a first diode, and a first resistor;

The b pole of the triode is electrically connected to the negative pole of the first diode, the anode of the first diode is electrically connected to the output terminal of the controller, the e pole of the triode is grounded, and the The c pole is electrically connected to the control terminal of the starting circuit through the first resistor.

Preferably, the startup loop includes: a MOS transistor, a first capacitor, a second resistor, and a second diode;

The G pole of the MOS tube is electrically connected to the C pole of the triode, the D pole of the MOS tube is electrically connected to the power supply, the S pole of the MOS tube is electrically connected to the electromagnetic valve, and the second diode The anode of the tube is electrically connected to the G pole of the MOS transistor, the cathode of the second diode is electrically connected to the S pole of the MOS transistor, and the second resistor is connected to both ends of the second diode, The first capacitor is connected to both ends of the second resistor.

Preferably, the step-down circuit is configured to output 50%-80% of the rated voltage of the solenoid valve.

Preferably, it also includes an isolation circuit arranged between the output end of the step-down loop and the output end of the start-up loop.

Preferably, the isolation circuit includes a third diode;

The output end of the startup loop is electrically connected to the cathode of the third diode, and the output end of the step-down loop is electrically connected to the anode of the third diode

The second embodiment of the present invention provides an electronic device, including a power supply, a solenoid valve, and a solenoid valve control circuit according to any one of the above, wherein the power supply is connected to the input end of the step-down circuit, the The input end of the start-up circuit is electrically connected to the control end, the output end of the step-down circuit is electrically connected to the solenoid valve, and the output end of the start-up circuit is electrically connected to the solenoid valve.

Based on a solenoid valve control circuit and electronic equipment provided by the present invention, the controller controls the conduction of the switch circuit when receiving the solenoid valve opening command, so that the power supply passes through the startup circuit to the At this time, the solenoid valve can be quickly started by its rated voltage, wherein the timing unit starts timing after receiving the startup command, and controls the switch circuit to turn off after the timing is completed, so that the power supply Power is supplied to the solenoid valve through the step-down circuit. At this time, the voltage output to the solenoid valve is 50%-80% of the rated voltage of the solenoid valve. It can keep the electromagnetic valve in the working state, and solves the problem of serious heat generation of the electromagnetic valve during operation.

Description of drawings

Fig. 1 is a schematic diagram of a control circuit of a solenoid valve provided by an embodiment of the invention;

Fig. 2 is a schematic diagram of the execution steps of the controller provided by the embodiment of the invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is some embodiments of the present invention, but not all of them. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the implementation manners in the present invention, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

The invention discloses a control circuit and electronic equipment of a solenoid valve, aiming at solving the problem of serious heat generation of the existing solenoid valve during operation.

Please refer to Fig. 1, the first embodiment of the present invention provides a control circuit of a solenoid valve, including: a controller, a step-down circuit 3, a starting circuit 2, and a switch circuit 1;

The output end of the controller is electrically connected to the control end of the switch circuit 1, the input end of the step-down circuit 3 is used to connect a power supply, the output end of the step-down circuit 3 is used to connect a solenoid valve, the The input terminal of the starting circuit 2 is electrically connected with the power supply, the output terminal of the starting circuit 2 is electrically connected with the solenoid valve, the control terminal of the starting circuit 2 is electrically connected with the power supply, and the The control terminal is electrically connected to the input terminal of the switch circuit 1, and the output terminal of the switch circuit 1 is grounded;

Referring to Figure 2, the controller is configured to implement the following steps by executing its internally stored computer program:

S101, when receiving an instruction to open the solenoid valve, control the switching circuit 1 to conduct, so that the power supply supplies power to the solenoid valve through the starting circuit 2;

S102, after receiving the timing signal from the timing unit, control the switching circuit 1 to turn off, so that the power supply supplies power to the solenoid valve through the step-down circuit 3 .

It should be noted that the inventors found that electromagnetic conversion units such as solenoid valves and solenoid gas valves are required in automobile comfort systems, smart homes, massagers, etc. However, the solenoid valves or solenoid gas valves in the prior art are all in When it works, the following problems will occur: the solenoid valve has serious heat generation and high power consumption, which will reduce its own life, and generate unnecessary heat to affect the work of other units, so it is not suitable for long-term working systems.

In this embodiment, the controller controls the conduction of the switching circuit 1 when receiving the solenoid valve opening command, so that the power supply supplies power to the solenoid valve through the starting circuit 2. At this time, The solenoid valve can be quickly started by its rated voltage V1, wherein the timing unit starts timing after receiving the starting command, and after the timing is completed, controls the switching circuit 1 to turn off, so that the power supply passes through the step-down circuit 3. Supply power to the solenoid valve. At this time, the voltage output to the solenoid valve is V2=(50%-80%)V1. It can keep the electromagnetic valve in the working state, and solves the problem of serious heat generation of the electromagnetic valve during operation.

It should be noted that, in this embodiment, the controller can be a single-chip microcomputer (such as STM32 series), or a PLC controller, which can output different electrical signals to the The switching circuit 1 described above, and then the electrical connection between the power supply and the solenoid valve is realized by switching between the step-down circuit 3 and the starting circuit 2.

In a possible embodiment of the present invention, the switch circuit 1 is configured to be turned on when receiving a high-level signal, so that the starting circuit 2 is short-circuited to the step-down circuit 3 .

The switch circuit 1 is configured to be turned off when receiving a low level signal, thereby causing the startup circuit 2 to be turned off.

In this embodiment, the switch loop 1 may include but not limited to: a triode Q1, a first diode D1, and a first resistor R1;

The b pole of the triode Q1 is electrically connected to the cathode of the first diode D1, the anode of the first diode D1 is electrically connected to the output terminal of the controller, and the pole of the triode Q1e is grounded, so The c-pole of the triode Q1 is electrically connected to the control terminal of the starting circuit 2 through the first resistor R1.

The startup loop 2 may include but not limited to: MOS transistor Q2, a first capacitor C1, a second resistor R2, and a second diode D2;

The MOS transistor Q2G pole is electrically connected to the c pole of the triode Q1, the MOS transistor Q2D pole is electrically connected to the power supply, the MOS transistor Q2S pole is electrically connected to the electromagnetic valve, and the second two The anode of the transistor D2 is electrically connected to the G pole of the MOS transistor Q2, the cathode of the second diode D2 is electrically connected to the S pole of the MOS transistor Q2, and the second resistor R2 is connected to the G pole of the second diode. across D2, the first capacitor C1 and across the second resistor R2

It should be noted that, in the above embodiment, when the controller receives an external need to start the solenoid valve, it controls to generate a high-level pulse signal of 50ms<T1<200ms, so that the transistor Q1 can be turned on, Furthermore, the G pole of the MOS transistor Q2 is pulled down, and the MOS transistor Q2 is turned on. At this time, the step-down circuit 3 is short-circuited by the turned-on MOS transistor Q2, and the power is directly supplied to the MOS transistor Q2 through the MOS transistor Q2. The solenoid valve is powered. In this embodiment, when the solenoid valve startup time T1>200ms, the controller outputs a low level signal, so that the triode Q1 is turned off, so that the MOS tube Q2 G is extremely high level, at this time, the MOS tube Q2 is cut off, and the power supply provides a holding voltage to the solenoid valve through the step-down circuit 3 . Among them, since the voltage (maintaining voltage) output by the step-down circuit 3 is lower than the voltage (rated voltage) output by the starting circuit 2, but at this time, the solenoid valve can still be in the working state, which effectively reduces the power consumption and heat generation of the system .

In a possible embodiment of the present invention, it further includes an isolation circuit 4 arranged between the output terminal of the step-down circuit 3 and the output terminal of the start-up circuit 2 .

Wherein, the isolation circuit 4 may include but not limited to a third diode D3;

The output end of the start-up circuit 2 is electrically connected to the cathode of the third diode D3, and the output end of the step-down circuit 3 is electrically connected to the anode of the third diode D3.

It should be noted that the isolation circuit is used to isolate the starting voltage and the holding voltage, so as to avoid damage to the step-down circuit 3 when the starting voltage is working. In other embodiments, other electronic components can also be used to form the The isolation circuit is not specifically limited here, but these solutions are all within the protection scope of the present invention.

The second embodiment of the present invention provides an electronic device, including a power supply, a solenoid valve, and a control circuit for a solenoid valve according to any one of the above, wherein the power supply is connected to the input end of the step-down circuit 3, The input end of the starting circuit 2 is electrically connected to the control end, the output end of the step-down circuit 3 is electrically connected to the electromagnetic valve, and the output end of the starting circuit 2 is electrically connected to the electromagnetic valve.

Based on the control circuit and electronic equipment of a solenoid valve provided by the present invention, the controller controls the conduction of the switch circuit 1 when receiving the solenoid valve opening command, so that the power supply passes through the startup circuit 2 Supply power to the solenoid valve. At this time, the solenoid valve can be quickly started by its rated voltage, wherein the timing unit starts timing after receiving the start command, and controls the switch circuit 1 to turn off after the timing is completed, so that The power supply supplies power to the solenoid valve through the step-down circuit 3. At this time, the voltage output to the solenoid valve is 50%-80% of the rated voltage of the solenoid valve. It can keep the electromagnetic valve in the working state, and solves the problem of serious heat generation of the electromagnetic valve during operation.

The above are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention.

Claims (8)

1. A control circuit of an electromagnetic valve, comprising: the system comprises a controller, a voltage reducing loop, a starting loop and a switching loop;

the output end of the controller is electrically connected with the control end of the switch loop, the input end of the voltage reduction loop is used for being connected with a power supply, the output end of the voltage reduction loop is used for being connected with an electromagnetic valve, the input end of the starting loop is electrically connected with the power supply, the output end of the starting loop is electrically connected with the electromagnetic valve, the control end of the starting loop is electrically connected with the power supply, the control end of the starting loop is electrically connected with the input end of the switch loop, and the output end of the switch loop is grounded;

the controller is configured to implement the following steps by executing a computer program stored therein:

when an electromagnetic valve opening instruction is received, the switch loop is controlled to be conducted, so that the power supply supplies power to the electromagnetic valve through the starting loop;

and after receiving a timing signal of the timing unit, controlling the switch loop to be turned off so that the power supply supplies power to the electromagnetic valve through the voltage reduction loop.

2. The control circuit of claim 1, wherein the switching loop is configured to turn on upon receipt of a high signal, thereby shorting the start loop to the buck loop;

the switching loop is configured to turn off upon receipt of a low level signal, thereby causing the startup loop to be turned off.

3. A control circuit for an electromagnetic valve according to claim 1 or 2, characterized in that the switching circuit comprises: a triode, a first diode, and a first resistor;

the b pole of the triode is electrically connected with the negative pole of the first diode, the positive pole of the first diode is electrically connected with the output end of the controller, the e pole of the triode is grounded, and the c pole of the triode is electrically connected with the control end of the starting loop through the first resistor.

4. A control circuit for an electromagnetic valve according to claim 3, wherein said startup loop comprises: the MOS transistor, the first capacitor, the second resistor and the second diode;

the MOS tube G electrode is electrically connected with the c electrode of the triode, the MOS tube D electrode is electrically connected with the power supply, the MOS tube S electrode is electrically connected with the electromagnetic valve, the anode of the second diode is electrically connected with the MOS tube G electrode, the cathode of the second diode is electrically connected with the MOS tube S electrode, the second resistor is arranged at two ends of the second diode, and the first capacitor is arranged at two ends of the second resistor.

5. A control circuit for an electromagnetic valve according to claim 1, wherein the buck circuit is configured to output 50% to 80% of the rated voltage of the electromagnetic valve.

6. The control circuit of claim 1, further comprising an isolation circuit disposed between the buck circuit output and the start-up circuit output.

7. The control circuit of claim 6, wherein the isolation circuit includes a third diode;

the output end of the starting loop is electrically connected with the cathode of the third diode, and the output end of the voltage reducing loop is electrically connected with the anode of the third diode.

8. An electronic device, characterized by comprising a power supply, a solenoid valve and a control circuit for the solenoid valve according to any one of claims 1 to 7, wherein the power supply is electrically connected to the input of the depressurization circuit, to the input of the start circuit and to the control terminal, the output of the depressurization circuit is electrically connected to the solenoid valve, and the output of the start circuit is electrically connected to the solenoid valve.

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