CN115325250A

CN115325250A - Solenoid valve drive circuit and solenoid valve drive system

Info

Publication number: CN115325250A
Application number: CN202211014005.0A
Authority: CN
Inventors: 杨高强; 陈杰; 杨正根; 曹艺锶; 陈校园
Original assignee: Guangzhou Kangsheng Biotechnology Co ltd
Current assignee: Guangzhou Kangsheng Biotechnology Co ltd
Priority date: 2022-08-23
Filing date: 2022-08-23
Publication date: 2022-11-11
Anticipated expiration: 2042-08-23
Also published as: CN115325250B

Abstract

The application provides a solenoid valve drive circuit and solenoid valve actuating system, this circuit includes: the first end of the first switch module is used for being connected with the first end of the solenoid valve coil; the first end of the timing module is used for being connected with the second end of the solenoid valve coil, the second end of the timing module is connected with the second end of the first switch module, and the third end of the timing module is connected with the control end of the first switch module; the timing module is used for conducting the first switch module under the condition that the voltage value of the first end of the timing module is a first voltage and the voltage value of the second end of the timing module is a second voltage until the continuous conducting time of the first switch module is greater than or equal to a preset time threshold. When the first switch module is conducted, a first current flows through the solenoid valve coil to drive the movable iron core of the solenoid valve to move from a first working position to a second working position; when the solenoid valve coil loses the electricity, the movable iron core of the solenoid valve is kept at the second working position under the action of the strong magnet of the solenoid valve.

Description

Solenoid valve drive circuit and solenoid valve drive system

Technical Field

The application relates to the technical field of electronic circuits, in particular to an electromagnetic valve driving circuit and an electromagnetic valve driving system.

Background

The electromagnetic valve is a commonly used electric control switch on-off device in electric control, and is widely used in various types of circuits. Generally, a solenoid valve is generally composed of an iron core, a coil, a spring, and other structural members. When the coil is electrified, a magnetic field can be formed to magnetize the iron core, so that the magnetized iron core moves from the first working position to the second working position. At this time, the solenoid valve is in the first operating state. After the coil is powered off, the magnetic field disappears, and the iron core moves to the first working position from the second working position under the action of the spring to complete resetting. At this time, the solenoid valve is in the second operating state.

In order to control the operating state of the solenoid valve, in the prior art, a power supply, a coil of the solenoid valve, an MOS Transistor (Metal-Oxide-Semiconductor Field-Effect Transistor) and a ground are sequentially connected, and by controlling the on-off state of the MOS Transistor, the power on and off of the coil of the solenoid valve can be controlled, so as to control the operating state of the solenoid valve and realize the driving of the solenoid valve. When the solenoid valve needs to be kept in the first working state, the MOS transistor is continuously turned on in the prior art, and in this case, the operating current of the solenoid valve continuously flows through the coil of the solenoid valve. Since the solenoid valve has a large operating current, the operating current continuously flowing through the coil of the solenoid valve increases the power consumption of the solenoid valve and causes heat generation problems, and the power supply has a power requirement.

Considering that the solenoid valve only needs a large current when the iron core acts, after the iron core acts to the second working position, a small magnetic field is formed by a certain maintaining current to offset the elastic force of the spring, so that the iron core is kept at the second working position. Therefore, in order to reduce the power consumption of the solenoid valve, some prior arts control the MOS transistor to be fully opened first, and after the iron core of the solenoid valve moves to the second working position, the MOS transistor is driven by a PWM (Pulse Width Modulation) narrow Pulse signal to form a holding current, so that the iron core is kept at the second working position, thereby reducing the power consumption of the solenoid valve and alleviating the heating problem of the solenoid valve.

However, in the above-described embodiment, although the current value of the holding current is smaller than that of the operating current, the holding current is also a non-negligible amount of current. For a solenoid valve with low power, the holding current is generally in the order of hundreds milliamperes; for a solenoid valve with greater power, the holding current is at least on the order of amperes. Therefore, in the above-described solenoid valve driving method, the solenoid valve still has a problem of heat generation that is difficult to ignore.

Disclosure of Invention

The present application aims to solve at least one of the above technical drawbacks, and in particular, to solve a problem that the conventional solenoid valve driving method causes heat generation of the solenoid valve which is difficult to ignore.

In a first aspect, the present application provides a solenoid valve driving circuit, comprising:

the first end of the first switch module is used for being connected with the first end of the solenoid valve coil;

the first end of the timing module is used for being connected with the second end of the solenoid valve coil, the second end of the timing module is connected with the second end of the first switch module, and the third end of the timing module is connected with the control end of the first switch module; the timing module is used for conducting the first switch module under the condition that the voltage value of the first end of the timing module is a first voltage and the voltage value of the second end of the timing module is a second voltage until the continuous conducting time of the first switch module is greater than or equal to a preset time threshold;

when the first switch module is switched on, a first current flows through the solenoid valve coil to drive the movable iron core of the solenoid valve to move from a first working position to a second working position; and under the condition that the solenoid valve coil is de-energized, the movable iron core of the solenoid valve is kept at the second working position under the action of a strong magnet of the solenoid valve.

In one embodiment, the solenoid valve driving circuit further includes:

the first end of the energy storage module is connected with the first end of the first switch module, and the second end of the energy storage module is connected with the second end of the first switch module; the energy storage module is used for charging based on the first voltage and the second voltage under the condition that the voltage value of the first end of the timing module is the first voltage, the voltage value of the second end of the timing module is the second voltage, and the first end of the first switch module is disconnected with the second end of the first switch module;

the first end of the reset module is connected with the second end of the energy storage module, and the second end of the reset module is used for being connected with the second end of the solenoid valve coil; the reset module is used for conducting connection between the second end of the energy storage module and the second end of the solenoid valve coil under the condition that the solenoid valve needs to be reset, so that a second current flows through the solenoid valve coil, and the solenoid valve movable iron core is driven to move from the second working position to the first working position and is kept at the first working position; the second current is in an opposite direction to the first current.

In one embodiment, the reset module comprises:

a first end of the first switch unit is connected with a second end of the energy storage module, and the second end of the first switch unit is used for being connected with a second end of the solenoid valve coil;

a first end of the double-end control unit is connected with the control end of the first switch unit, a second end of the double-end control unit is connected with a second end of the energy storage module, and a third end of the double-end control unit is used for being connected with a second end of the solenoid valve coil; the double-end control unit is used for conducting the first switch unit under the condition that the electromagnetic valve needs to be reset, so that the second current flows through the electromagnetic valve coil.

In one embodiment, the first switch unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first voltage stabilizing diode, a first switch tube and a second switch tube;

the first end of the first resistor is connected with the first end of the double-end control unit, the second end of the first resistor is connected with the cathode of the first voltage-stabilizing diode, the anode of the first voltage-stabilizing diode is respectively connected with the control end of the first switch tube and the first end of the second resistor, and the second end of the second resistor is respectively connected with the first end of the energy storage module and the first end of the first switch tube;

the second end of the first switch tube is connected with the first end of the third resistor and the first end of the fourth resistor respectively, the second end of the fourth resistor is connected with the control end of the second switch tube, the first end of the second switch tube is used for being connected with the second end of the solenoid valve coil, and the second end of the second switch tube is connected with the second end of the energy storage module and the second end of the third resistor respectively;

under the condition that the electromagnetic valve needs to be reset, the difference between the voltage value of the first end of the double-end control unit and the voltage value of the first end of the energy storage module is larger than the breakdown voltage of the first voltage stabilizing diode.

In one embodiment, the two-terminal control unit comprises a second voltage stabilizing diode, a third switching tube, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor;

the negative electrode of the second voltage-stabilizing diode is respectively connected with the second end of the energy storage module, the first end of the fifth resistor and the first end of the third switching tube, the second end of the third switching tube is respectively connected with the first end of the first resistor and the first end of the sixth resistor, and the second end of the sixth resistor is used for being connected with the second end of the solenoid valve coil;

a first end of the seventh resistor is connected to a second end of the sixth resistor, a second end of the seventh resistor is respectively connected to a first end of the eighth resistor and an anode of the third zener diode, and a cathode of the third zener diode is respectively connected to a second end of the fifth resistor and a control end of the third switching tube; a second end of the eighth resistor is connected with the anode of the second voltage stabilizing diode;

the positive electrode of the second voltage stabilizing diode is used as a positive voltage input end of the electromagnetic valve driving circuit, and the first end of the seventh resistor is used as a grounding end of the electromagnetic valve driving circuit; the resistance ratio of the seventh resistor to the eighth resistor is determined according to the breakdown voltage of the third zener diode, so that the voltage value of the second end of the third switching tube is greater than the turn-on voltage of the first switching tube under the condition that the electromagnetic valve needs to be reset, and the first switching tube is turned on.

In one embodiment, the timing module comprises:

a first end of the second switch unit is used for being connected with a second end of the solenoid valve coil, and a second end of the second switch unit is connected with the control end of the first switch module; the first switch module is turned on when the second switch unit is turned on, and the first switch module is turned off when the second switch unit is turned off;

the first end of the capacitor unit is used for being connected with the second end of the solenoid valve coil, the second end of the capacitor unit is connected with the second end of the first switch module, and the third end of the capacitor unit is connected with the control end of the second switch unit; the capacitor unit is used for charging and conducting the second switch unit when the voltage value of the first end of the capacitor unit is the first voltage and the voltage value of the second end of the capacitor unit is the second voltage until the continuous charging time of the capacitor unit is greater than or equal to the preset time threshold.

In one embodiment, the capacitor unit comprises a ninth resistor, a tenth resistor and a first capacitor;

the first end of the ninth resistor is used for being connected with the second end of the solenoid valve coil, the second end of the ninth resistor is respectively connected with the control end of the second switch unit and the first end of the tenth resistor, the second end of the tenth resistor is connected with the first end of the first capacitor, and the second end of the first capacitor is connected with the second end of the first switch module.

In one embodiment, the second switching unit comprises a fourth switching tube and a first diode;

the first end of fourth switch tube is used for connecting the second end of solenoid valve coil, the second end of fourth switch tube is connected the control end of first switch module, the control end of fourth switch tube is connected respectively the second end of ninth resistance with the negative pole of first diode, the positive pole of first diode is connected the first end of ninth resistance.

In a second aspect, an embodiment of the present application provides a solenoid valve driving system, which includes an on-off control circuit and the solenoid valve driving circuit described in any of the above embodiments;

the first end of the on-off control circuit is used for connecting a power supply, the second end of the on-off control circuit is connected with the first end of a first switch module in the electromagnetic valve driving circuit, and the third end of a timing module in the electromagnetic valve driving circuit is used for being grounded; or the first end of the on-off control circuit is connected with the third end of the timing module, the second end of the on-off control circuit is used for grounding, and the second end of the first switch module is used for connecting the power supply;

and the control end of the on-off control circuit is used for receiving a control signal and switching on or off the connection between the first end of the on-off control circuit and the second end of the on-off control circuit according to the control signal.

In one embodiment, the on-off control circuit comprises a fourth voltage stabilizing diode, a fifth switch tube, an eleventh resistor and a twelfth resistor;

a cathode of the fourth voltage stabilizing diode is respectively connected with a control end of the fifth switching tube, a first end of the eleventh resistor and a first end of the twelfth resistor, and an anode of the fourth voltage stabilizing diode is respectively connected with a second end of the eleventh resistor and a first end of the fifth switching tube;

the first end of the fifth switch tube is used as the first end of the on-off control circuit, the second end of the fifth switch tube is used as the second end of the on-off control circuit, and the second end of the twelfth resistor is used as the control end of the on-off control circuit.

In the solenoid valve driving circuit and the solenoid valve driving system of the application, a first end of a first switch module is used for being connected with a first end of a solenoid valve coil, a second end of the first switch module is connected with a second end of a timing module, a control end of the first switch module is connected with a third end of the timing module, and a first end of the timing module is used for being connected with the solenoid valve coil. When the voltage value of the first end of the timing module is a first voltage and the voltage value of the second end of the timing module is a second voltage, the timing module conducts the first switch module until the continuous conduction time of the first switch module is greater than or equal to a preset time threshold.

Under the condition that the first switch module is conducted, the solenoid valve coil is electrified under the action of first voltage and second voltage, and first current flows through the solenoid valve coil, so that the movable iron core of the solenoid valve can move from the first working position to the second working position under the action of a magnetic field. Under the condition that the continuous conduction time of the first switch module is greater than or equal to the preset time threshold value, it can be determined that the movable iron core of the electromagnetic valve is located at the second working position, under the condition, the timing module disconnects the first switch module, the coil of the electromagnetic valve is de-energized, the movable iron core of the electromagnetic valve is kept at the second working position under the action of the powerful magnet of the electromagnetic valve, and the electromagnetic valve can be kept at the first working state without maintaining current.

In this application, the timing module can be under the condition of being applyed driving voltage, according to presetting the time threshold and continuously switching on first switch module to for the solenoid valve provides the action current, ensure that the solenoid valve moves the iron core and can follow first operating position and move to second operating position. When the continuous conduction time of the first switch module is longer than a preset time threshold value, the timing module can automatically disconnect the first switch module, so that basically no current flows through the electromagnetic valve coil, the ultralow static power consumption of the electromagnetic valve drive can be realized, and the heating problem in the electromagnetic valve drive process is solved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is one of schematic structural block diagrams of a solenoid valve driving circuit in one embodiment;

FIG. 2 is a second schematic block diagram of a solenoid valve driving circuit according to an embodiment;

FIG. 3 is a third schematic block diagram of a solenoid driver circuit according to an embodiment;

FIG. 4 is a circuit diagram of a reset module in one embodiment;

FIG. 5 is a fourth schematic block diagram of a solenoid valve driving circuit according to an embodiment;

FIG. 6 is a circuit diagram of a timing module in one embodiment;

FIG. 7 is a circuit diagram of a solenoid valve driving circuit in one embodiment;

FIG. 8 is one of the circuit diagrams of the solenoid valve driving system in one embodiment;

FIG. 9 is a second circuit diagram of a solenoid valve driving system according to an embodiment.

Detailed Description

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.

In the following embodiments, the present application provides a solenoid valve driving circuit and a solenoid valve driving system for driving a solenoid valve having a specific structure. For convenience of description, the following embodiments will simply refer to the solenoid valve of this specific structure as a solenoid valve.

Specifically, the "solenoid valve having a specific structure" is a solenoid valve provided with a solenoid valve coil, a solenoid valve plunger, and a solenoid valve strong magnet. When the first current flows through the solenoid valve coil, the solenoid valve coil forms a magnetic field with a magnetic field direction in the first direction, and the solenoid valve movable iron core is magnetized, so that the solenoid valve movable iron core moves from the first working position to the second working position. When the movable iron core of the electromagnetic valve moves to the second working position, the strong magnet of the electromagnetic valve can attract the movable iron core of the electromagnetic valve. Therefore, even if the solenoid valve coil is in power failure, the movable iron core of the solenoid valve can be kept at the second working position under the action of the strong magnet of the solenoid valve, so that the solenoid valve is in the first working state. In the event that the solenoid needs to be reset, a second current may be passed through the solenoid coil. Wherein the current direction of the second current is opposite to the current direction of the first current. When the second current flows through the electromagnetic valve coil, the electromagnetic valve coil forms a magnetic field with the magnetic field direction being the second direction, and the electromagnetic valve movable iron core is magnetized, so that the electromagnetic valve movable iron core can get rid of the magnetic force action of the electromagnetic valve strong magnet, and moves from the second working position to the first working position, and then the reset of the electromagnetic valve is completed.

It can be understood that, in the solenoid valve with the specific structure, the arrangement relationship of the solenoid valve coil, the solenoid valve plunger and the solenoid valve strong magnet can be determined according to actual requirements, and the solenoid valve with the specific structure can work according to the working mode without being specifically limited by the application. In one embodiment, the solenoid strong magnet may be disposed at an end of the solenoid proximate the second operating position.

In one embodiment, the present application provides a solenoid driver circuit 10, the solenoid driver circuit 10 including a first switch module 110 and a timing module 120. As shown in fig. 1, a first end of the first switch module 110 is used for connecting a first end of the solenoid valve coil L1, a second end of the first switch module 110 is connected to a second end of the timing module 120, and a control end of the first switch module 110 is connected to a third end of the timing module 120. The first end of the timing module 120 is also used to connect to the second end of the solenoid L1. The first terminal of the timing module 120 may be used as a first voltage input terminal of the solenoid valve driving circuit 10, the second terminal of the timing module 120 may be used as a second voltage input terminal of the solenoid valve driving circuit 10, and the solenoid valve driving circuit 10 may receive a driving voltage through the first voltage input terminal and the second voltage input terminal to drive or reset the solenoid valve based on the driving voltage. In one embodiment, the first voltage input terminal may be a ground terminal GND, and the second voltage input terminal may be a forward voltage input terminal V +, that is, the first voltage input terminal may be used for grounding and the second voltage input terminal may be used for connecting a power supply when the solenoid valve is driven.

Specifically, when the voltage value of the first end of the timing module 120 is the first voltage and the voltage value of the second end of the timing module 120 is the second voltage, the timing module 120 may turn on the first switch module 110, that is, the timing module 120 may turn on the connection between the first end of the first switch module 110 and the second end of the first switch module 110, until the continuous on-time of the first switch module 110 is greater than or equal to the preset time threshold.

When the first switch module 110 is turned on, a first voltage may be applied to the second end of the solenoid valve coil L1, and a second voltage may be applied to the first end of the solenoid valve coil L1 through the first switch module 110. Therefore, under the action of the first voltage and the second voltage, the solenoid coil L1 is energized, and a first current can flow through the solenoid coil L1. When a first current flows through the solenoid valve coil L1, the solenoid valve coil L1 forms a magnetic field having a first magnetic field direction, and magnetizes the solenoid valve plunger, so that the solenoid valve plunger moves from the first operating position toward the second operating position.

It is understood that the current direction of the current depends on the relative magnitude relationship between the first voltage and the second voltage. For example, when the first voltage is greater than the second voltage, the current direction of the first current is a direction from the second end of solenoid coil L1 to the first end of solenoid coil L1; when the first voltage is lower than the second voltage, the current direction of the first current is a direction from the first end of the solenoid coil L1 to the second end of the solenoid coil L1.

When the voltage value of the first end of the timing module 120 is the first voltage and the voltage value of the second end of the timing module 120 is the second voltage, if the continuous on-time of the first switch module 110 is greater than or equal to the preset time threshold, the timing module 120 may disconnect the first switch module 110, that is, disconnect the first end of the first switch module 110 and the second end of the first switch module 110. In this case, the second voltage cannot be applied to the first end of the solenoid valve coil L1, and in the absence of another path, the solenoid valve coil L1 is de-energized, and the solenoid valve plunger is held at the second operating position by the solenoid valve strong magnet, so that the solenoid valve is held in the first operating state. Under the condition that solenoid valve coil L1 loses electricity, solenoid valve coil L1 does not have holding current to can realize ultralow quiescent power dissipation, and then solve the problem of generating heat in the solenoid valve drive process.

It is understood that the timing module 120 of the present application can be implemented in any manner, for example, by using a voltage detection circuit and a controller, or by using a capacitor charging and discharging circuit described in this embodiment, which is not particularly limited in this application, and only the timing module 120 can implement the above functions. The specific duration of the preset time threshold may also be determined according to actual requirements, which is not specifically limited in the present application.

In this application, the timing module 120 may continuously turn on the first switch module 110 according to a preset time threshold under the condition that the driving voltage is applied, so as to provide an actuating current for the solenoid valve, and ensure that the solenoid valve plunger may move from the first working position to the second working position. When the continuous on-time of the first switch module 110 is greater than the preset time threshold, the timing module 120 may automatically turn off the first switch module 110, so that substantially no current flows through the solenoid valve coil L1, thereby implementing ultra-low static power consumption of solenoid valve driving, and further solving the heating problem in the solenoid valve driving process.

In addition, this application can realize the drive of solenoid valve through high low level to realize the ultralow static power consumption of solenoid valve driven, need not the PWM ripples and drive, thereby can reduce the requirement to control signal.

After the solenoid valve is driven, when the solenoid valve coil L1 is de-energized, the movable iron core of the solenoid valve is kept at the second working position under the action of the strong magnet of the solenoid valve. In order to realize the resetting of the solenoid valve, the movable iron core of the solenoid valve is moved from the second working position to the first working position, and a second current in a direction opposite to the first current needs to be applied to the solenoid valve coil L1 during the resetting, so that the solenoid valve is reset based on the second current.

To enable the solenoid driver circuit 10 to drive the solenoid to reset, in one embodiment, as shown in fig. 2, the solenoid driver circuit 10 may further include an energy storage module 130 and a reset module 140. The energy storage module 130 is a device or a circuit having an electric energy storage function, and the reset module 140 is a circuit or a device capable of selectively turning on or off the connection between the energy storage module 130 and the solenoid valve coil L1. The energy storage module 130 and the reset module 140 may be implemented by any means in the prior art, and the application is not limited thereto.

The energy storage module 130 is connected in parallel with the first switching module 110, and the reset module 140 is connected in parallel with the timing module 120. Specifically, a first end of the energy storage module 130 is connected to a first end of the first switch module 110, a second end of the energy storage module 130 is connected to a second end of the first switch module 110 and a first end of the reset module 140, and a second end of the reset module 140 is used for connecting to a second end of the solenoid valve coil L1.

When the voltage value of the first terminal of the timing module 120 is the first voltage and the voltage value of the second terminal of the timing module 120 is the second voltage, if the connection between the first terminal of the first switch module 110 and the second terminal of the first switch module 110 is turned on, the energy storage module 130 is short-circuited by the first switch module 110, and cannot be charged based on the first voltage and the second voltage. When the voltage value of the first end of the timing module 120 is the first voltage and the voltage value of the second end of the timing module 120 is the second voltage, if the connection between the first end of the first switch module 110 and the second end of the first switch module 110 is disconnected, the first voltage may be applied to the first end of the energy storage module 130 through the solenoid valve coil L1, and the second voltage may be applied to the second end of the energy storage module 130, so that the energy storage module 130 may be charged based on the first voltage and the second voltage to store the electric energy for resetting the solenoid valve.

When the solenoid valve needs to be reset (for example, the voltage value of the first end of the timing module 120 changes, and/or the voltage value of the second end of the timing module 120 changes), the reset module 140 may conduct the connection between the second end of the energy storage module 130 and the second end of the solenoid valve coil L1, at this time, the energy storage module 130, the reset module 140 and the solenoid valve coil L1 form a loop, the voltage of the first end of the energy storage module 130 may be applied to the first end of the solenoid valve coil L1, and the voltage of the second end of the energy storage module 130 may be applied to the second end of the solenoid valve coil L1, so that a second current opposite to the first current direction flows through the solenoid valve coil L1, and then the solenoid valve plunger is driven to move from the second working position to the first working position and is kept at the first working position, thereby resetting of the solenoid valve is achieved.

In a specific implementation, the solenoid valve driving circuit 10 can be selected from one of the following two connection relationships:

(1) The second voltage input terminal of the solenoid valve driving circuit 10 may be used for connecting a power supply, the first voltage input terminal of the solenoid valve driving circuit 10 may be used for connecting a drain of an NMOS transistor, and a source of the NMOS transistor is grounded. The NMOS transistor can be turned on or off under the action of the control signal to adjust the voltage at the first voltage input terminal of the solenoid driving circuit 10. When the NMOS transistor is turned on, the solenoid valve driving circuit 10 may drive the solenoid valve, and when the NMOS transistor is turned off, the solenoid valve driving circuit 10 may reset the solenoid valve.

(2) A first voltage input terminal of the solenoid valve driving circuit 10 is used for grounding, a second voltage input terminal of the solenoid valve driving circuit 10 may be used for connecting a drain of a PMOS transistor, and a source of the PMOS transistor is connected to a power supply. The PMOS transistor can be turned on or off under the action of the control signal to adjust the voltage at the second voltage input terminal of the solenoid driving circuit 10. When the PMOS transistor is turned on, the solenoid valve driving circuit 10 may realize driving of the solenoid valve, and when the PMOS transistor is turned off, the solenoid valve driving circuit 10 may realize resetting of the solenoid valve.

In the above two connection relationships, the voltage variation conditions of the first voltage input end and the second voltage input end of the solenoid valve driving circuit 10 are different during the reset. In order to enable the solenoid valve driving circuit 10 to adapt to the two connection relationships, and to achieve the resetting of the solenoid valve in the two connection relationships, the resetting module 140 of the present application may be implemented by the structure shown in fig. 3. As shown in fig. 3, the reset module 140 may include a first switch unit 142 and a double-ended control unit 144, wherein a first end of the first switch unit 142 is connected to a second end of the energy storage module 130, the second end of the first switch unit 142 is used for connecting to a second end of the solenoid valve coil L1, a control end of the first switch unit 142 is connected to a first end of the double-ended control unit 144, a second end of the double-ended control unit 144 is connected to a second end of the energy storage module 130, and a third end of the double-ended control unit 144 is used for connecting to a second end of the solenoid valve coil L1.

The two-terminal control unit 144 is configured to provide a turn-on voltage or a turn-on current for the first switching unit 142 when the solenoid valve needs to be reset, so as to turn on the first switching unit 142, that is, turn on the connection between the first terminal of the first switching unit 142 and the second terminal of the first switching unit 142. When the first switching unit 142 is turned on, the energy storage module 130, the first switching unit 142, and the solenoid coil L1 form a loop, so that a second current can flow through the solenoid coil L1. It is to be understood that the dual ended control unit 144 of the present application may be implemented in any form, and the present application is not limited thereto. For example, the two-terminal control unit 144 may be implemented based on a controller, or may be implemented based on a voltage comparison circuit.

In one embodiment, the first switching unit 142 may be implemented using the circuit structure shown in fig. 4. As shown in fig. 4, the first switching unit 142 includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first zener diode D1, a first switching tube Q1, and a second switching tube Q2. It can be understood that the first switching transistor Q1 and the second switching transistor Q2 are implemented by MOS transistors or transistors, respectively. For convenience of illustration, fig. 4 and the embodiments herein take the first switch Q1 as an NPN transistor and the second switch Q2 as a PNP transistor for illustration.

As shown in fig. 4, a first end of the first resistor R1 is connected to a first end of the two-terminal control unit 144, a second end of the first resistor R1 is connected to a cathode of the first zener diode D1, an anode of the first zener diode D1 is respectively connected to the control end of the first switch Q1 and a first end of the second resistor R2, and a second end of the second resistor R2 is respectively connected to the first end of the energy storage module 130 and the first end of the first switch Q1.

The second end of the first switch tube Q1 is connected to the first end of the third resistor R3 and the first end of the fourth resistor R4, the second end of the fourth resistor R4 is connected to the control end of the second switch tube Q2, the first end of the second switch tube Q2 is used for connecting the second end of the solenoid valve coil L1, and the second end of the second switch tube Q2 is connected to the second end of the energy storage module 130 and the second end of the third resistor R3.

Specifically, the first zener diode D1 may be broken down by the level of the first terminal of the two-terminal control unit 144. In case that the solenoid valve needs to be reset, a difference between a voltage value of the first terminal of the two-terminal control unit 144 and a voltage value of the first terminal of the energy storage module 130 is greater than a breakdown voltage of the first zener diode D1, so that the first zener diode D1 can be broken down when the solenoid valve needs to be reset.

When the first zener diode D1 is broken down, the first end of the double-end control unit 144, the first resistor R1, the first zener diode D1, the second resistor R2, and the first end of the energy storage module 130 form a loop, so that there is a voltage drop at both ends of the second resistor R2, and thus the voltage of the control end of the first switch tube Q1 (i.e., the voltage of the base) can be pulled high, so that the first switch tube Q1 can form a base driving current and then be turned on. When the first switch tube Q1 is turned on, the voltage at the control end of the second switch tube Q2 is pulled low, so that the second switch tube Q2 can form a base driving current to be turned on. Under the condition that the second switching tube Q2 is switched on, the energy storage module 130, the second switching tube Q2 and the solenoid valve coil L1 form a loop, so that a second current can be applied to the solenoid valve coil L1 through the energy storage module 130 to realize solenoid valve reset.

Further, as shown in fig. 4, the first switch unit 142 may further include a second diode D2, a cathode of the second diode D2 is connected to the first end of the second resistor R2, and an anode of the second diode D2 is connected to the second end of the second resistor R2. Therefore, the first switch tube Q1 can be protected to prevent the voltage generated during resetting from breaking through the base and the emitter of the first switch tube Q1.

In one embodiment, the dual ended control unit 144 may be implemented using the circuit configuration shown in fig. 4. As shown in fig. 4, the two-terminal control unit 144 includes a second zener diode D3, a third zener diode D4, a third switching tube Q3, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. It should be understood that the third switching transistor Q3 can be implemented by a MOS transistor or a transistor, and for convenience of description, fig. 4 and this embodiment use the third switching transistor Q3 as a PNP transistor as an example for description.

The cathode of the second zener diode D3 is connected to the second end of the energy storage module 130, the first end of the fifth resistor R5, and the first end of the third switching tube Q3, the second end of the third switching tube Q3 is connected to the first end of the first resistor R1 and the first end of the sixth resistor R6, respectively, and the second end of the sixth resistor R6 is used to connect the second end of the solenoid valve coil L1.

A first end of the seventh resistor R7 is connected to a second end of the sixth resistor R6, a second end of the seventh resistor R7 is respectively connected to a first end of the eighth resistor R8 and an anode of the third zener diode D4, and a cathode of the third zener diode D4 is respectively connected to a second end of the fifth resistor R5 and a control end of the third switching tube Q3; a second end of the eighth resistor R8 is connected to the anode of the second zener diode D3.

Wherein, the anode of the second zener diode D3 serves as the forward voltage input terminal V + of the solenoid valve driving circuit 10, and the first end of the seventh resistor R7 serves as the ground GND of the solenoid valve driving circuit 10; the resistance ratio of the seventh resistor R7 to the eighth resistor R8 is determined according to the breakdown voltage of the third zener diode D4, so that the voltage value of the second end of the third switching tube Q3 is greater than the turn-on voltage of the first switching tube Q1 under the condition that the electromagnetic valve needs to be reset, and the first switching tube Q1 is turned on.

Specifically, the positive electrode of the second zener diode D3 serves as the positive voltage input terminal V + of the solenoid valve driving circuit 10, that is, when the solenoid valve needs to be driven, the positive electrode of the second zener diode D3 can be used to connect a power supply so that the voltage of the positive electrode of the second zener diode D3 is a positive voltage. The first end of the seventh resistor R7 is used as the ground GND of the solenoid valve driving circuit 10, that is, when the solenoid valve needs to be driven, the first end of the seventh resistor R7 can be used as the ground, so that the voltage of the first end of the seventh resistor R7 is the reference ground voltage.

In the connection relationship of the solenoid valve driving circuit 10 in the above (1), the anode of the second zener diode D3 is used for connecting to the power supply, and the first end of the seventh resistor R7 is used for connecting to the drain of the NMOS transistor. Under the condition that reset is needed, the NMOS transistor is turned off under the action of the control signal, and the power supply, the eighth resistor R8, the seventh resistor R7, the sixth resistor R6, the first resistor R1, the first voltage-stabilizing diode D1, the second resistor R2 and the energy storage module 130 form a loop, so that the voltage of the control end of the first switch transistor Q1 can be pulled up through the voltage drop of the second resistor R2 to turn on the first switch transistor Q1, and further the second switch transistor Q2 can be turned on through the principle described in the above embodiment. When the second switch tube Q2 is turned on, the energy storage module 130 and the solenoid valve coil L1 form a loop, so that a second current flows through the solenoid valve coil L1, and drives the solenoid valve plunger to reset. Meanwhile, under the condition that the second switch tube Q2 is turned on, the voltage at the second end of the sixth resistor R6 is further pulled high, so that the voltage value at the second end of the second resistor R2 can be increased to form positive feedback, and the second switch tube Q2 is ensured to be completely opened.

In the connection relationship of the solenoid valve driving circuit 10 in the aforementioned (2), the anode of the second zener diode D3 is used to connect the drain of the PMOS transistor, and the first end of the seventh resistor R7 is used to be grounded. Under the condition that reset is required, the PMOS transistor is turned off under the action of the control signal, the positive voltage of the third zener diode D4 is pulled down to the ground, the negative voltage of the third zener diode D4 is pulled up to the power voltage by the energy storage module 130, therefore, the third zener diode D4 is broken down, the third zener diode D4 conducts and stabilizes voltage, so that the voltage of the control end of the third switching transistor Q3 is pulled down to the ground through the seventh resistor R7, the voltage of the control end of the third switching transistor Q3 is much smaller than the voltage of the first end of the third switching transistor Q3 (i.e., the voltage of the control end of the third switching transistor is much smaller than the collector voltage), and the third switching transistor Q3 conducts. When the third switching tube Q3 is turned on, the voltage of the first end of the sixth resistor R6 is pulled up to a high voltage through the third switching tube Q3, so that the voltage of the cathode of the first zener diode D1 is pulled up to the high voltage. Because the positive voltage of the first zener diode D1 is the negative voltage of the energy storage module 130, when the third switching tube Q3 is turned on, the first zener diode D1 is broken down, so that the energy storage module 130, the third switching tube Q3, the sixth resistor R6, the first resistor R1, the first zener diode D1, and the second resistor R2 form a loop, and then the voltage of the control end of the first switching tube Q1 can be pulled up by the voltage drop of the second resistor R2 to turn on the first switching tube Q1, and then the second switching tube Q2 can be turned on by the principle described in the above embodiment, so that the reset of the movable iron core of the electromagnetic valve is realized.

In one embodiment, the resistance of the eighth resistor R8 may be much smaller than the resistance of the seventh resistor R7. In the case where the solenoid valve needs to be driven, the anode of the second zener diode D3 is used for connecting the power supply and the first end of the seventh resistor R7 is used for grounding regardless of the connection relationship between the two foregoing relationships. Since the resistance of the seventh resistor R7 is much smaller than the resistance of the eighth resistor R8, the voltage drop of the eighth resistor R8 is smaller than the breakdown voltage of the third zener diode D4, so that the third zener diode D4 is turned off, and the third switching tube Q3 is turned off. Meanwhile, the voltage at the control end of the first switch tube Q1 is pulled low through the sixth resistor R6, so the first switch tube Q1 is also turned off. The voltage at the control terminal of the second switch tube Q2 is pulled high through the fourth resistor R4 and the third resistor R3, so that the second switch tube Q2 is also turned off. That is, no matter which of the two connection relationships is adopted, the reset module 140 of this embodiment may cut off the connection between the second end of the energy storage module 130 and the second end of the solenoid valve coil L1 under the condition that the solenoid valve needs to be driven, so as to ensure that the first current flows through the solenoid valve coil L1, and thus the forward conduction of the solenoid valve is realized.

In one embodiment, the timing module 120 may include a second switching unit 122 and a capacitance unit 124. As shown in fig. 5, a first end of the second switching unit 122 is used for connecting a second end of the solenoid valve coil L1, a second end of the second switching unit 122 is connected to the control end of the first switching module 110, and the control end of the second switching unit 122 is connected to the third end of the capacitor unit 124. The first end of the capacitor unit 124 is used for connecting the second end of the solenoid valve coil L1, and the second end of the capacitor unit 124 is connected to the second end of the first switch module 110.

The capacitor unit 124 is configured to charge and turn on the second switch unit 122 when the voltage value of the first end of the capacitor unit 124 is the first voltage and the voltage value of the second end of the capacitor unit 124 is the second voltage, until the continuous charging time of the capacitor unit 124 is greater than or equal to the preset time threshold. The first switch module 110 is turned on when the second switch unit 122 is turned on, and the first switch module 110 is turned off when the second switch unit 122 is turned off.

Specifically, the first terminal of the capacitor unit 124 is the first terminal of the timing module 120, and the second terminal of the capacitor unit 124 is the second terminal of the timing module 120. When the solenoid driving circuit 10 is applied with the driving voltage, the voltage of the first terminal of the capacitor unit 124 is the first voltage, the voltage of the second terminal of the capacitor unit 124 is the second voltage, and the capacitor unit 124 can be charged by using the first voltage and the second voltage. In the charging process, the voltage at the third terminal of the capacitor unit 124 changes with the charging condition, so as to selectively turn on or off the second switch unit 122. When the charging time of the capacitor unit 124 is less than the preset time threshold, the capacitor unit 124 may turn on the second switch unit 122, in this case, the first switch module 110 is turned on, the second voltage may be applied to the first end of the solenoid valve coil L1 through the first switch module 110, and the first voltage may be applied to the second end of the solenoid valve coil L1, so that the first current may flow through the solenoid valve coil L1, so as to move the solenoid valve plunger from the first working position to the second working position. When the charging time of the capacitor unit 124 is greater than or equal to the preset time threshold, the capacitor unit 124 may turn off the second switch unit 122, in which case the first switch module 110 is also turned off, and no current flows through the solenoid valve coil L1.

In this embodiment, the timing module 120 can be implemented by the capacitor unit 124 and the switch unit without using a controller or other devices, so that the cost of the solenoid valve driving circuit 10 can be reduced. Meanwhile, after the capacitor is charged, the quiescent current is approximately 0, so that the capacitor is adopted to realize the timing module 120, so that the quiescent power consumption of the solenoid valve driving circuit 10 can be further reduced.

In one embodiment, as shown in fig. 6, the capacitance unit 124 includes a ninth resistor R9, a tenth resistor R10, and a first capacitor C1. A first end of the ninth resistor R9 is used for connecting a second end of the solenoid valve coil L1, a second end of the ninth resistor R9 is respectively connected to the control end of the second switch unit 122 and a first end of the tenth resistor R10, a second end of the tenth resistor R10 is connected to a first end of the first capacitor C1, and a second end of the first capacitor C1 is connected to a second end of the first switch module 110.

Specifically, a first end of the ninth resistor R9 is a first end of the capacitor unit 124, and a second end of the first capacitor C1 is a second end of the capacitor unit 124. When the voltage value of the second end of the capacitor unit 124 is the second voltage, since the voltage difference between the two ends of the capacitor cannot change abruptly, the voltage of the first end of the first capacitor C1 is also the second voltage, at this time, the voltage of the second end of the tenth resistor R10 is the second voltage, and the voltage of the first end of the ninth resistor R9 is the first voltage, so that the second switch unit 122 can be turned on by the voltage drop of the ninth resistor R9. During the charging process of the first capacitor C1, the voltage difference between the two ends of the first capacitor C1 gradually changes from 0 to the difference between the first voltage and the second voltage, and the voltage at the first end of the first capacitor C1 gradually tends to the first voltage. Therefore, during the charging process of the first capacitor C1, the voltage drop of the ninth resistor R9 will decrease slowly, and when the voltage drop of the ninth resistor R9 is smaller than the on-voltage of the second switch unit 122, the second switch unit 122 is turned off, and the first switch module 110 is also turned off accordingly. Thus, the capacitor unit 124 can be implemented in a simple and low-cost manner to reduce the complexity and cost of the solenoid driving circuit 10.

In one embodiment, as shown in fig. 6, the second switching unit 122 includes a fourth switching tube Q4 and a first diode D5. It is understood that the fourth switching transistor Q4 can be implemented by a MOS transistor or a transistor, and for convenience of description, fig. 6 and this embodiment take the fourth switching transistor Q4 as an NPN transistor as an example.

As shown in fig. 6, a first end of the fourth switching tube Q4 is used for connecting a second end of the solenoid valve coil L1, a second end of the fourth switching tube Q4 is connected to a control end of the first switching module 110, the control end of the fourth switching tube Q4 is respectively connected to a second end of the ninth resistor R9 and a negative electrode of the first diode D5, and an anode of the first diode D5 is connected to the first end of the ninth resistor R9.

Specifically, when the fourth switching tube Q4 is turned on, the voltage of the control terminal of the first switching module 110 is the first voltage, and the first switching module 110 is turned on. When the fourth switching tube Q4 is turned off, the first switching module 110 is also turned off. Through the control end with first diode D5 negative pole is connected to fourth switch tube Q4, is connected to the first end of fourth switch tube Q4 with first diode D5's political performance to voltage breakdown fourth switch tube Q4 that produces when can avoiding the solenoid valve that resets, with protection fourth switch tube Q4, improve solenoid valve drive circuit 10's reliability.

In one embodiment, the energy storage module 130 may be a second capacitor C2, a first terminal of the second capacitor C2 is used as the first terminal of the energy storage module 130, and a second terminal of the second capacitor C2 is used as the second terminal of the energy storage module 130. Further, the second capacitor C2 may be a large-capacity capacitor, for example, the second capacitor C2 may be a capacitor of 2000 microfarads. After the capacitor is charged, and after the energy storage of the second capacitor C2 is completed, no current basically passes through the solenoid valve driving circuit 10, so that the static power consumption of the solenoid valve driving circuit 10 can be further reduced by using the capacitor to realize the energy storage module 130.

In one embodiment, the first switch module 110 may include a thirteenth resistor R13, a fourteenth resistor R14, and a sixth switch tube Q6. The first end of the thirteenth resistor R13 is connected to the second end of the timing module 120 and the first end of the sixth switching tube Q6, the second end of the sixth switching tube Q6 is used for connecting the first end of the solenoid valve coil L1, the control end of the sixth switching tube Q6 is connected to the first end of the fourteenth resistor R14, and the second end of the fourteenth resistor R14 is connected to the second end of the thirteenth resistor R13 and the third end of the timing module 120. In this way, the capacitor unit 124 can be implemented in a simple and low-cost manner to reduce the complexity and cost of the solenoid driving circuit 10.

In order to facilitate understanding of the aspects of the present application, the following description will be given by way of specific examples. The solenoid valve driving circuit 10 of the present application may be as shown in fig. 7, and the circuit includes a plurality of diodes, a plurality of resistors, a plurality of switching tubes, and a plurality of capacitors, and the connection relationship between the devices may be as described in the above embodiment and shown in fig. 7. The anode of the second zener diode D3 serves as the forward voltage input terminal V + of the solenoid valve driving circuit 10, and the first end of the seventh resistor R7 serves as the ground GND of the solenoid valve driving circuit 10.

When the electromagnetic valve needs to be driven, the positive voltage input end V + is used for connecting a power supply, and the ground end GND is used for grounding. When the electromagnetic valve needs to be reset, the forward voltage input end V + can be directly connected with a power supply, and the grounding end GND is disconnected with the ground. Or, when the solenoid valve needs to be reset, the forward voltage input end V + can be disconnected from the power supply, and the ground end GND is directly grounded.

In this example, the resistance of the eighth resistor R8 is much smaller than that of the seventh resistor R7, so that the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are all turned off when the solenoid valve needs to be driven. Since the voltage difference across the first capacitor C1 cannot change abruptly, when the voltage at the second terminal of the first capacitor C1 is the power supply voltage, the voltage at the first terminal of the first capacitor C1 is also the power supply voltage when charging is started. Therefore, the voltage at the control end of the fourth switching tube Q4 is pulled high, the fourth switching tube Q4 is conducted, and further the sixth switching tube Q6 is conducted, so that the power voltage can be applied to the solenoid valve coil L1 through the sixth switching tube Q6 to form a loop between the power supply, the solenoid valve coil L1 and the ground, and the driving of the solenoid valve coil L1 is realized.

When the solenoid valve needs to be reset, as shown in the above embodiment, the double-end control unit 144 may turn on the first switch tube Q1, and further turn on the second switch tube Q2, so that a loop may be formed between the energy storage module 130 and the solenoid valve coil L1, thereby resetting the solenoid valve.

In one embodiment, the present application further provides a solenoid driving system, which includes an on-off control circuit and the solenoid driving circuit 10 described in any of the above embodiments. The first end of the on-off control circuit is used for connecting a power supply, the second end of the on-off control circuit is connected with the first end of the first switch module 110 in the electromagnetic valve driving circuit 10, and the third end of the timing module 120 in the electromagnetic valve driving circuit 10 is used for grounding; or, a first end of the on-off control circuit is connected to the third end of the timing module 120, a second end of the on-off control circuit is used for grounding, and a second end of the first switch module 110 is used for connecting the power supply.

Specifically, when the on-off control signal is turned on, the solenoid valve driving circuit 10 may be respectively connected to the power supply and the ground, and drive the movable core of the solenoid valve to move from the first working position to the second working position in the manner described in the foregoing embodiment, so as to drive the solenoid valve. When the on-off control signal is turned off, the solenoid valve driving circuit 10 may be connected to only the power supply or only the ground, and drives the movable core of the solenoid valve to move from the second working position to the first working position in the manner described in the foregoing embodiments, so as to reset the solenoid valve.

It can be understood that the on-off control circuit of the present application can be implemented in any manner, and the present application does not specifically limit this. In one embodiment, the on-off control circuit includes a fourth zener diode D7, a fifth switching tube Q5, an eleventh resistor R11, and a twelfth resistor R12. A cathode of the fourth zener diode D7 is connected to the control end of the fifth switching tube Q5, the first end of the eleventh resistor, and the first end of the twelfth resistor R12, respectively, and an anode of the fourth zener diode D7 is connected to the second end of the eleventh resistor R11 and the first end of the fifth switching tube Q5, respectively. A first end of the fifth switching tube Q5 is used as a first end of the on-off control circuit, a second end of the fifth switching tube Q5 is used as a second end of the on-off control circuit, and a second end of the twelfth resistor R12 is used as a control end of the on-off control circuit.

The fourth zener diode D7 is configured to release the reverse instantaneous high voltage generated by the solenoid valve coil L1 when the fifth switching tube Q5 is disconnected, so as to prevent the fifth switching tube Q5 from being broken down, and thus protect the fifth switching tube Q5. The eleventh resistor R11 is used for ensuring that the fifth switching tube Q5 can be timely disconnected when the control signal is output in a high-resistance mode, and therefore the electromagnetic valve is prevented from being started by mistake.

For example, the solenoid valve driving system of the present application may be as shown in fig. 8, where Ctrl is a control signal, and fig. 8 shows a connection structure of the solenoid valve driving system when the fifth switching tube Q5 is an NMOS tube. For another example, the solenoid valve driving system of the present application may be as shown in fig. 9, and fig. 9 shows a connection structure of the solenoid valve driving system when the fifth switching tube Q5 is a PMOS tube.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element. As used herein, the terms "a," "an," "the," and "the" can also include the plural forms as well, unless the context clearly indicates otherwise. Plural means at least two cases, such as 2, 3, 5 or 8, etc. "and/or" includes any and all combinations of the associated listed items.

In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, the embodiments may be combined as needed, and the same and similar parts may be referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solenoid valve drive circuit, comprising:

2. The solenoid driver circuit according to claim 1, further comprising:

the first end of the reset module is connected with the second end of the energy storage module, and the second end of the reset module is used for being connected with the second end of the solenoid valve coil; the reset module is used for conducting connection between the second end of the energy storage module and the second end of the solenoid valve coil under the condition that the solenoid valve needs to be reset, so that a second current flows through the solenoid valve coil, and the solenoid valve movable iron core is driven to move from the second working position to the first working position and is kept at the first working position; the second current is in the opposite direction to the first current.

3. The solenoid driver circuit of claim 2, wherein the reset module comprises:

the first end of the first switch unit is connected with the second end of the energy storage module, and the second end of the first switch unit is used for being connected with the second end of the solenoid valve coil;

a first end of the double-end control unit is connected with the control end of the first switch unit, a second end of the double-end control unit is connected with a second end of the energy storage module, and a third end of the double-end control unit is used for being connected with a second end of the electromagnetic valve coil; the double-end control unit is used for conducting the first switch unit to enable the second current to flow through the solenoid valve coil under the condition that the solenoid valve needs to be reset.

4. The electromagnetic valve driving circuit according to claim 3, wherein the first switching unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a first voltage regulator diode, a first switching tube and a second switching tube;

the first end of the first resistor is connected with the first end of the double-end control unit, the second end of the first resistor is connected with the cathode of the first voltage stabilizing diode, the anode of the first voltage stabilizing diode is respectively connected with the control end of the first switch tube and the first end of the second resistor, and the second end of the second resistor is respectively connected with the first end of the energy storage module and the first end of the first switch tube;

5. The solenoid driver circuit according to claim 4, wherein the double-ended control unit comprises a second zener diode, a third switching tube, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;

the negative electrode of the second voltage stabilizing diode is respectively connected with the second end of the energy storage module, the first end of the fifth resistor and the first end of the third switching tube, the second end of the third switching tube is respectively connected with the first end of the first resistor and the first end of the sixth resistor, and the second end of the sixth resistor is used for being connected with the second end of the solenoid valve coil;

the positive electrode of the second voltage stabilizing diode is used as a positive voltage input end of the electromagnetic valve driving circuit, and the first end of the seventh resistor is used as a grounding end of the electromagnetic valve driving circuit; the resistance ratio of the seventh resistor to the eighth resistor is determined according to the breakdown voltage of the third voltage regulator diode, so that the voltage value of the second end of the third switching tube is greater than the conduction voltage of the first switching tube under the condition that the electromagnetic valve needs to be reset, and the first switching tube is conducted.

6. The solenoid driver circuit of any one of claims 1-5, wherein the timing module comprises:

7. The solenoid driver circuit according to claim 6, wherein the capacitance unit includes a ninth resistor, a tenth resistor, and a first capacitor;

8. The solenoid driver circuit according to claim 7, wherein the second switching unit comprises a fourth switching tube and a first diode;

9. A solenoid valve drive system comprising an on-off control circuit and a solenoid valve drive circuit according to any one of claims 1 to 8;

10. The solenoid valve drive system of claim 9, wherein the on-off control circuit comprises a fourth zener diode, a fifth switching tube, an eleventh resistor, and a twelfth resistor;

a cathode of the fourth voltage-stabilizing diode is respectively connected with a control end of the fifth switching tube, a first end of the eleventh resistor and a first end of the twelfth resistor, and an anode of the fourth voltage-stabilizing diode is respectively connected with a second end of the eleventh resistor and a first end of the fifth switching tube;