Coil control circuit of electromagnetic valve and electromagnetic valve control device

Abstract

The invention provides a coil control circuit of an electromagnetic valve and an electromagnetic valve control device, and relates to the technical field of circuit control. The coil control circuit comprises a control unit, a first switch unit, a second switch unit, a signal negation unit and a high-side control switch unit. An input pin of the high-side control switch unit is connected with a preset power supply, an output pin of the high-side control switch unit is connected with a coil of the electromagnetic valve, an output end of the control unit is connected with a control end of the first switch unit, and an output pin of the first switch unit is connected with a control end of the high-side control switch unit to control the first switch unit to be in an on state; the input pin and the output pin of the high-side control switch unit are switched on; the output end of the control unit is further connected with the control end of the second switch unit through the signal negation unit, and the output pin of the second switch unit is connected with the control end of the high-side control switch unit to control the second switch unit to be turned on, so that the input pin and the output pin of the high-side control switch unit are disconnected.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit control, and in particular to a coil control circuit of a solenoid valve and a solenoid valve control device. Background Art

[0002] Currently, for the high-side control method of the separated current valve, a high-side control switch is usually used for circuit control. The base of the high-side control switch is used as an enable signal for the current solenoid valve control. The base of the high-side control switch is supplemented with power through a resistor. If the power supply range is required to be up to 27V, the power consumption requirement for the charging resistor will be relatively large, especially in the case of high ambient temperature. The temperature will reduce the resistance, and the maximum power consumption that the resistor can withstand will be reduced.

[0003] In order to meet the system requirements of resistor power consumption, the prior art usually increases the number of resistors, increases the resistance value of resistors, or uses high-power packages. However, in the above methods, increasing the resistance value of resistors will increase the base charging time of the high-side control switch and slow down the closing time of the high-side control switch. Summary of the invention

[0004] The object of the present invention is to provide a solenoid valve coil control circuit and a solenoid valve control device to address the deficiencies in the above-mentioned prior art, so as to charge the control end of the high-side control switch unit through the second switch unit, thereby speeding up the charging time of the control end of the high-side control switch unit and the time of closing the high-side control switch unit, and effectively reducing the closing delay of the high-side control switch unit.

[0005] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

[0006] In a first aspect, an embodiment of the present application provides a coil control circuit of a solenoid valve, wherein the coil control circuit comprises: a control unit, a first switch unit, a second switch unit, a signal inversion unit, and a high-side control switch unit; an input pin of the high-side control switch unit is used to connect a preset power supply, and an output pin of the high-side control switch unit is used to connect the coil of the solenoid valve;

[0007] The output end of the control unit is connected to the control end of the first switch unit, and the output pin of the first switch unit is connected to the control end of the high-side control switch unit to control the first switch unit to be in an on state, so that the input pin and the output pin of the high-side control switch unit are turned on;

[0008] The output end of the control unit is also connected to the control end of the second switch unit through the signal inversion unit, the input pin of the second switch unit is used to connect the preset power supply, and the output pin of the second switch unit is connected to the control end of the high-side control switch unit, so as to control the second switch unit to be turned off when the first switch unit is in the on state, and to control the second switch unit to be turned on when the first switch unit is in the off state, so that the input pin and the output pin of the high-side control switch unit are disconnected.

[0009] In an optional embodiment, the first switch unit includes: a first transistor;

[0010] The base of the first transistor is connected to the output end of the control unit, the collector of the first transistor is connected to the control end of the high-side control switch unit, and the emitter of the first transistor is grounded.

[0011] In an optional implementation, the coil control circuit further includes: a pull-down resistor, and the output end of the control unit is grounded through the pull-down resistor.

[0012] In an optional implementation, the coil control circuit further includes: a first current limiting resistor, and the output end of the control unit is further connected to the base of the first transistor through the first current limiting resistor.

[0013] In an optional implementation, the signal inversion unit is a NOT gate logic device.

[0014] In an optional embodiment, the second switch unit includes: a second triode and a third triode;

[0015] The base of the second triode is the control end of the second switch unit, and is used to connect the output end of the signal inversion unit, and the emitter of the second triode is grounded;

[0016] The collector of the second transistor is connected to the base of the third transistor, the emitter of the third transistor is the input end of the second switch unit for connecting to the preset power supply, and the collector of the third transistor is the output end of the second switch unit for connecting to the control end of the high-side control switch unit.

[0017] In an optional implementation, the coil control circuit further includes: a delay capacitor, and the output end of the signal inversion unit is also grounded through the delay capacitor.

[0018] In an optional implementation, the coil control circuit further includes: a second current limiting resistor; and the output pin of the first switch unit is connected to the control end of the high-side control switch unit through the second current limiting resistor.

[0019] In an optional implementation, the coil control circuit further includes: a discharge resistor, and the control end of the high-side control switch unit is further connected to the output end of the high-side control switch unit through the discharge resistor.

[0020] In a second aspect, an embodiment of the present application further provides a solenoid valve control device, which includes: a coil control circuit as described in any one of the first aspects above, and a solenoid valve, wherein the coil control circuit is connected to the coil of the solenoid valve.

[0021] The beneficial effects of this application are:

[0022] The embodiment of the present application provides a coil control circuit of a solenoid valve and a solenoid valve control device, the coil control circuit comprising: a control unit, a first switch unit, a second switch unit, a signal inversion unit and a high-side control switch unit; the input pin of the high-side control switch unit is used to connect a preset power supply, the output pin of the high-side control switch unit is used to connect the coil of the solenoid valve, the output end of the control unit is connected to the control end of the first switch unit, the output pin of the first switch unit is connected to the control end of the high-side control switch unit, so as to control the first switch unit to be in an on state, so that the input pin and the output pin of the high-side control switch unit are turned on; the output end of the control unit is also connected to the control end of the second switch unit through the signal inversion unit, the input pin of the second switch unit is used to connect a preset power supply, the output pin of the second switch unit is connected to the control end of the high-side control switch unit, so as to control the second switch unit to be turned off when the first switch unit is in an on state, and to control the second switch unit to be turned on when the first switch unit is in a turned-off state, so that the input pin and the output pin of the high-side control switch unit are disconnected.

[0023] The control unit controls the first switch unit to be in an on state and the second switch unit to be in an off state, discharges the control end of the high-side control switch unit, causes a voltage difference between the control end and the input pin, and realizes the opening of the high-side control switch unit. The control unit controls the first switch unit to be in an off state and the second switch unit to be in an on state, charges the control end of the high-side control switch unit, causes the voltage between the control end and the input pin to be consistent, and realizes the closing of the high-side control switch unit. There is no need to charge the control end of the high-side control switch unit through a charging resistor, thereby avoiding unnecessary power consumption. At the same time, by charging the control end of the high-side control switch unit through the second switch unit, the charging time of the control end of the high-side control switch unit and the time of closing the high-side control switch unit can be accelerated, effectively reducing the closing delay of the high-side control switch unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of a coil control circuit of a solenoid valve provided in an embodiment of the present application;

[0026] Figure 2 A schematic diagram of another coil control circuit of a solenoid valve provided in an embodiment of the present application;

[0027] Figure 3 A schematic diagram of a coil control circuit of another solenoid valve provided in an embodiment of the present application;

[0028] Figure 4 A schematic diagram of a solenoid valve control device is provided for an embodiment of the present application.

[0029] Explanation of main component symbols: 100-coil control circuit; 110-control unit; 120-first switch unit; 130-second switch unit; 140-signal inversion unit; Q1-high-side control switch unit; Q2-coil of solenoid valve; 200-solenoid valve; Q3-first transistor; Q4-second transistor; Q5-third transistor; R1-pull-down resistor; R2-first current limiting resistor; C1-delay capacitor; R3-second current limiting resistor; R4-discharge resistor. DETAILED DESCRIPTION

[0030] 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 drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0031] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0032] In the description of the present application, it should be noted that if the terms "upper", "lower", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the application is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0035] The coil control circuit of the solenoid valve provided in the present application is specifically described below through multiple examples in combination with the accompanying drawings.

[0036] Figure 1 A schematic diagram of a coil control circuit of a solenoid valve provided in an embodiment of the present application; Figure 1 As shown, the coil control circuit 100 includes: a control unit 110, a first switch unit 120, a second switch unit 130, a signal inversion unit 140 and a high-side control switch unit Q1; the input pin of the high-side control switch unit Q1 is used to connect to a preset power supply, and the output pin of the high-side control switch unit Q1 is used to connect to the coil Q2 of the solenoid valve.

[0037] The output end of the control unit 110 is connected to the control end of the first switch unit 120, and the output pin of the first switch unit 120 is connected to the control end of the high-side control switch unit Q1 to control the first switch unit 120 to be in an on state, so that the input pin and output pin of the high-side control switch unit Q1 are turned on.

[0038] Wherein, the high-side control switch unit Q1 can be a metal oxide semiconductor field effect transistor, and the pins of the high-side control switch unit Q1 include: a control end pin, an input pin and an output pin. If the high-side control switch unit Q1 is a P-type metal oxide semiconductor field effect transistor (PMOSFET), the control end pin is the gate G, the input pin is the source S, and the output pin is the drain D. If the high-side control switch unit Q1 is an N-type metal oxide semiconductor field effect transistor (NMOSFET), the control end pin is the gate G, the input pin is the drain D, and the output pin is the source S. When a voltage difference is generated between the control end and the input pin, and the voltage difference is greater than or equal to a preset voltage threshold, the input pin and the output pin of the high-side control switch unit Q1 are turned on. When the voltage value between the control end and the input pin is consistent, or the voltage difference is less than the preset voltage threshold, the input pin and the output pin of the high-side control switch unit Q1 are disconnected. The following examples all take the high-side control switch unit Q1 as a PMOSFET as an example. The coil Q2 of the solenoid valve can be used to control the solenoid valve 200. When the coil has current, a magnetic field is generated to control the solenoid valve 200 to open. When the coil has no current, the solenoid valve 200 is controlled to close.

[0039] Specifically, the control signal output by the control unit 110 is used to control the conduction and disconnection of the first switch unit 120, thereby controlling the conduction and disconnection of the input pin and the output pin of the high-side control switch unit Q1. If the control signal output by the output end of the control unit 110 is a high-level signal, the first switch unit 120 is controlled to be turned on and in an on state by the high-level signal, and the output pin of the first switch unit 120 is connected to the control end of the high-side control switch unit Q1. Since the first switch unit 120 is turned on, a voltage difference is generated between the control end and the input pin of the high-side control switch unit Q1. When the voltage difference is greater than or equal to a preset voltage threshold, the input pin and the output pin of the high-side control switch unit Q1 are turned on.

[0040] Since the input pin of the high-side control switch unit Q1 is connected to the preset power supply, and the output pin of the high-side control switch unit Q1 is connected to the coil Q2 of the solenoid valve, the input pin and the output pin of the high-side control switch unit Q1 are turned on, so that the preset power supply can supply power to the coil Q2 of the solenoid valve through the high-side control switch unit Q1.

[0041] It should be noted that if the control signal output from the output end of the control unit 110 is a low-level signal, the first switch unit 120 cannot be controlled to be turned on by the low-level signal, so the input pin and output pin of the high-side control switch unit Q1 cannot be turned on, and the preset power supply cannot supply power to the coil Q2 of the solenoid valve through the high-side control switch unit Q1.

[0042] The output end of the control unit 110 is also connected to the control end of the second switch unit 130 through the signal inversion unit 140. The input pin of the second switch unit 130 is used to connect to a preset power supply. The output pin of the second switch unit 130 is connected to the control end of the high-side control switch unit Q1, so that when the first switch unit 120 is in the on state, the second switch unit 130 is controlled to be turned off, and when the first switch unit 120 is in the off state, the second switch unit 130 is controlled to be turned on, so that the input pin and the output pin of the high-side control switch unit Q1 are disconnected.

[0043] Specifically, the control signal output by the control unit 110 is also used to control the conduction and disconnection of the second switch unit 130, so as to control the conduction and disconnection of the input pin and the output pin of the high-side control switch unit Q1. If the control signal output by the output end of the control unit 110 is a high-level signal, the first switch unit 120 is in the on state at this time, and the high-level signal is inverted by the signal inversion unit 140 to obtain a low-level signal, and the low-level signal cannot control the conduction of the second switch unit 130 connected to the signal inversion unit 140. Therefore, by inverting the control signal output by the output end of the control unit 110 by the signal inversion unit 140, it can be ensured that when the first switch unit 120 is in the on state, the second switch unit 130 is in the off state.

[0044] If the control signal output from the output end of the control unit 110 is a low-level signal, the first switch unit 120 is in a closed state at this time, and the low-level signal is inverted by the signal inversion unit 140 to obtain a high-level signal. The high-level signal can control the second switch unit 130 connected to the signal inversion unit 140 to be turned on. Therefore, the signal inversion unit 140 can also ensure that when the first switch unit 120 is in a closed state, the second switch unit 130 is in an open state.

[0045] Since the input pin of the second switch unit 130 is connected to the preset power supply, and the output pin of the second switch unit 130 is connected to the control end of the high-side control switch unit Q1, when the second switch unit 130 is in the on state, the preset power supply can supply power to the control end of the high-side control switch unit Q1 through the second switch unit 130, resulting in the voltage between the control end of the high-side control switch unit Q1 and the input pin being kept consistent, and the voltage difference is less than the preset voltage threshold, thereby causing the input pin and the output pin of the high-side control switch unit Q1 to be disconnected, and the preset power supply cannot supply power to the coil Q2 of the solenoid valve.

[0046] Optionally, the signal inversion unit 140 is a NOT gate logic device.

[0047] The NOT gate logic device is used to invert the control signal output from the output end of the control unit 110 to ensure that when the first switch unit 120 is in the off state, the second switch unit 130 is in the on state, and when the first switch unit 120 is in the on state, the second switch unit 130 is in the off state.

[0048] In summary, an embodiment of the present application provides a coil control circuit for a solenoid valve, the coil control circuit comprising: a control unit, a first switch unit, a second switch unit, a signal inversion unit and a high-side control switch unit; the input pin of the high-side control switch unit is used to connect a preset power supply, the output pin of the high-side control switch unit is used to connect the coil of the solenoid valve, the output end of the control unit is connected to the control end of the first switch unit, the output pin of the first switch unit is connected to the control end of the high-side control switch unit, so as to control the first switch unit to be in an on state, so that the input pin and the output pin of the high-side control switch unit are turned on; the output end of the control unit is also connected to the control end of the second switch unit through the signal inversion unit, the input pin of the second switch unit is used to connect a preset power supply, and the output pin of the second switch unit is connected to the control end of the high-side control switch unit, so as to control the second switch unit to be turned off when the first switch unit is in an on state, and to control the second switch unit to be turned on when the first switch unit is in a turned-off state, so that the input pin and the output pin of the high-side control switch unit are disconnected.

[0049] The control unit controls the first switch unit to be in an on state and the second switch unit to be in an off state, discharges the control end of the high-side control switch unit, causes a voltage difference between the control end and the input pin, and realizes the opening of the high-side control switch unit. The control unit controls the first switch unit to be in an off state and the second switch unit to be in an on state, charges the control end of the high-side control switch unit, causes the voltage between the control end and the input pin to be consistent, and realizes the closing of the high-side control switch unit. There is no need to charge the control end of the high-side control switch unit through a charging resistor, thereby avoiding unnecessary power consumption. At the same time, by charging the control end of the high-side control switch unit through the second switch unit, the charging time of the control end of the high-side control switch unit and the time of closing the high-side control switch unit can be accelerated, effectively reducing the closing delay of the high-side control switch unit.

[0050] Figure 2 A schematic diagram of another solenoid valve coil control circuit provided in an embodiment of the present application; Figure 2 As shown, the first switch unit 120 includes: a first transistor Q3.

[0051] The base 1 of the first transistor Q3 is connected to the output end of the control unit 110 , the collector 3 of the first transistor Q3 is connected to the control end of the high-side control switch unit Q1 , and the emitter 2 of the first transistor Q3 is grounded.

[0052] In this embodiment, the base 1 of the first transistor Q3 is connected to the output end of the control unit 110. When the base 1 of the first transistor Q3 has a high voltage signal, the collector 3 and the emitter 2 of the first transistor Q3 are turned on, and the first transistor Q3 is in an on state. Since the collector 3 of the first transistor Q3 is connected to the control end of the high-side control switch unit Q1 and the emitter 2 of the first transistor Q3 is grounded, the voltage of the control end of the high-side control switch unit Q1 is reduced to 0V, thereby increasing the voltage difference between the control end and the input pin of the high-side control switch unit Q1, resulting in the input pin and the output pin of the high-side control switch unit Q1 being turned on.

[0053] When the base 2 of the first transistor Q3 has a low voltage signal, the collector 3 and the emitter 2 of the first transistor Q3 are disconnected, and the first transistor Q3 is in a closed state, which cannot cause the input pin and the output pin of the high-side control switch unit Q1 to be turned on.

[0054] Optionally, the coil control circuit 100 further includes: a pull-down resistor R1 , and the output end of the control unit 110 is grounded through the pull-down resistor R1 .

[0055] The pull-down resistor R1 is connected to the output terminal of the control unit 110 to ensure that the initial working state of the first transistor Q3 is a closed state.

[0056] Optionally, the coil control circuit 100 further includes: a first current limiting resistor R2, and the output end of the control unit 110 is further connected to the base of the first transistor Q3 through the first current limiting resistor R2.

[0057] Among them, one end of the first current limiting resistor R2 is connected to the output end of the control unit 110, and the other end is connected to the base of the first transistor Q3, which is used to reduce the current of the base of the first transistor Q3 to ensure that the first transistor Q3 is in the on state. At the same time, the control unit 110 is protected to reduce overcurrent impact.

[0058] Figure 3 A schematic diagram of a coil control circuit of another solenoid valve provided in an embodiment of the present application; Figure 3 As shown, the second switch unit 130 includes: a second transistor Q4 and a third transistor Q5.

[0059] The base 2 of the second transistor Q4 is the control end of the second switch unit 130 and is used to connect to the output end of the signal inversion unit 140 . The emitter 1 of the second transistor Q4 is grounded.

[0060] The collector 6 of the second transistor Q4 is connected to the base 5 of the third transistor Q5, the emitter 4 of the third transistor Q5 is the input end of the second switch unit 130 for connecting to a preset power supply, and the collector 3 of the third transistor Q5 is the output end of the second switch unit 130 for connecting to the control end of the high-side control switch unit Q1.

[0061] Specifically, the base 2 of the second transistor Q4 is connected to the output end of the signal inversion unit 140. When the signal inversion unit 140 inverts the control signal to obtain a high-level signal, the emitter 4 and the collector 3 of the third transistor Q5 are turned on, so that the preset power supply charges the control end of the high-side control switch unit Q1 through the third transistor Q5.

[0062] When the signal inversion unit 140 inverts the control signal to obtain a low level signal, the emitter 4 and collector 3 of the third transistor Q5 are disconnected, so that the preset power supply cannot charge the control end of the high-side control switch unit Q1 through the third transistor Q5.

[0063] Optionally, the coil control circuit 100 further includes: a delay capacitor C1 , and the output end of the signal inversion unit 140 is also grounded through the delay capacitor C1 .

[0064] Specifically, the base 2 of the second transistor Q4 has a base resistor, which forms a filter circuit with the delay capacitor C1. A hardware dead time can be created according to the capacitance value of the delay capacitor C1 to prevent the first switch unit 120 and the second switch unit 130 from being turned on at the same time, causing the preset power supply to be connected to the ground.

[0065] Optionally, the coil control circuit 100 further includes: a second current limiting resistor R3; and an output pin of the first switch unit 120 is connected to a control end of the high-side control switch unit Q1 through the second current limiting resistor R3.

[0066] Specifically, one end of the second current limiting resistor R3 is connected to the output pin of the first switch unit 120, and the other end is connected to the control end of the high-side control switch unit Q1. The second current limiting resistor R3 can suppress the pulse signal of the control end of the high-side control switch unit Q1 to protect the high-side control switch unit Q1.

[0067] Optionally, the coil control circuit 100 further includes: a discharge resistor R4 , and the control end of the high-side control switch unit Q1 is further connected to the output end of the high-side control switch unit Q1 through the discharge resistor R4 .

[0068] Specifically, one end of the discharge resistor R4 is connected to the control end of the high-side control switch unit Q1, and the other end is connected to the output end of the high-side control switch unit Q1. The discharge resistor R4 is used to maintain the initial state of the high-side control switch unit Q1 in the uncharged state.

[0069] Figure 4 A schematic diagram of a solenoid valve control device is provided for an embodiment of the present application; Figure 4 As shown, the solenoid valve control device includes: a coil control circuit 100, and a solenoid valve 200, and the coil control circuit 100 is connected to the coil Q2 of the solenoid valve.

[0070] Specifically, the coil control circuit 100 is described in detail in the above embodiment and will not be repeated here. The control of the coil Q2 of the solenoid valve by the coil control circuit 100 further realizes the control of the solenoid valve 200. When the coil Q2 of the solenoid valve has current, the coil generates a magnetic field to control the solenoid valve 200 to open. When the coil Q2 of the solenoid valve has no current, the coil controls the solenoid valve 200 to close.

[0071] The coil Q2 of the solenoid valve is controlled by the duty cycle. The current flowing to the coil Q2 of the solenoid valve is obtained by the conduction frequency and the proportion of conduction and closure of the input pin and the output pin of the high-side control switch unit Q1. The current of the coil is expressed as: I = [VCC / RQ4 (coil resistance)] * duty cycle. Therefore, the current control frequency of the coil is related to the conduction and disconnection time of the high-side control switch unit Q1. The coil control circuit 100 controls the charging time of the control end of the high-side control switch unit Q1 by controlling the opening and closing of the first switch unit 120 and the opening and closing of the second switch unit 130, and further controls the conduction and disconnection time of the high-side control switch unit Q1. At the same time, it speeds up the charging time of the control end of the high-side control switch unit Q1 and the time to close the high-side control switch unit Q1, effectively reducing the closing delay of the high-side control switch unit Q1.

[0072] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A coil control circuit for a solenoid valve, characterized in that: The coil control circuit comprises: a control unit, a first switch unit, a second switch unit, a signal inversion unit and a high-side control switch unit; the input pin of the high-side control switch unit is used to connect to a preset power supply, and the output pin of the high-side control switch unit is used to connect to the coil of the solenoid valve; The output end of the control unit is connected to the control end of the first switch unit, and the output pin of the first switch unit is connected to the control end of the high-side control switch unit to control the first switch unit to be in an on state, so that the input pin and the output pin of the high-side control switch unit are turned on; The output end of the control unit is also connected to the control end of the second switch unit through the signal inversion unit, the input pin of the second switch unit is used to connect the preset power supply, and the output pin of the second switch unit is connected to the control end of the high-side control switch unit, so as to control the second switch unit to be turned off when the first switch unit is in the on state, and to control the second switch unit to be turned on when the first switch unit is in the off state, so that the input pin and the output pin of the high-side control switch unit are disconnected.

2. The circuit according to claim 1, characterized in that The first switch unit includes: a first transistor; The base of the first transistor is connected to the output end of the control unit, the collector of the first transistor is connected to the control end of the high-side control switch unit, and the emitter of the first transistor is grounded.

3. The circuit according to claim 2, characterized in that The coil control circuit further includes a pull-down resistor, and the output end of the control unit is grounded through the pull-down resistor.

4. The circuit according to claim 3, characterized in that The coil control circuit further includes: a first current limiting resistor, and the output end of the control unit is also connected to the base of the first transistor through the first current limiting resistor.

5. The circuit according to claim 1, characterized in that The signal inversion unit is a NOT gate logic device.

6. The circuit according to claim 1, characterized in that The second switch unit includes: a second triode and a third triode; The base of the second triode is the control end of the second switch unit, and is used to connect the output end of the signal inversion unit, and the emitter of the second triode is grounded; The collector of the second transistor is connected to the base of the third transistor, the emitter of the third transistor is the input end of the second switch unit for connecting to the preset power supply, and the collector of the third transistor is the output end of the second switch unit for connecting to the control end of the high-side control switch unit.

7. The circuit according to claim 6, characterized in that The coil control circuit further includes a delay capacitor, and the output end of the signal inversion unit is also grounded through the delay capacitor.

8. The circuit according to claim 1, characterized in that The coil control circuit further includes: a second current limiting resistor; and an output pin of the first switch unit is connected to a control end of the high-side control switch unit through the second current limiting resistor.

9. The circuit according to claim 1, characterized in that The coil control circuit further includes: a discharge resistor, and the control end of the high-side control switch unit is also connected to the output end of the high-side control switch unit through the discharge resistor.

10. A solenoid valve control device, characterized in that: The solenoid valve control device comprises: a coil control circuit as described in any one of claims 1 to 9, and a solenoid valve, wherein the coil control circuit is connected to the coil of the solenoid valve.

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