Electromagnetic valve switch control circuit and electromagnetic valve

Abstract

The utility model relates to an electromagnetic valve switch control circuit and an electromagnetic valve. The electromagnetic valve switch control circuit comprises a first switch device, a second switch device, a third switch device and a fourth switch device, one end of the first switching device is electrically connected with one end of the fourth switching device and a power supply end / grounding end, and the other end of the first switching device is electrically connected with one end of the second switching device and one end of the electromagnetic coil; one end of the third switching device is electrically connected with the other end of the fourth switching device and the other end of the electromagnetic coil, and the other end of the third switching device is electrically connected with the other end of the second switching device and the grounding end / power end. The conduction directions of the first switching device and the second switching device are opposite; the third switching device and the fourth switching device are opposite in conduction direction, and the second switching device and the fourth switching device are the same in conduction direction. Based on the electromagnetic valve on-off control circuit, quick closing control over the electromagnetic valve can be achieved.

Description

Technical Field

[0001] This application relates to the field of solenoid valve control technology, and more specifically, to solenoid valve switching control circuits and solenoid valves. Background Technology

[0002] Solenoid valves are controlled to open or close by controlling the coil current. Specifically, when the coil is energized, the coil current rises to a higher value (opening current threshold), establishing a magnetic field and attracting the solenoid valve, thus opening it. When the coil is de-energized, the coil current drops to a lower value (closing current threshold), the magnetic field gradually disappears, and the solenoid valve is closed.

[0003] Because the electromagnetic coil is an inductive load, changes in current exhibit a lag, resulting in a significant difference between the ideal coil control state and the actual coil control state. Therefore, existing solenoid valve control methods often suffer from problems such as long response time and low control accuracy. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a solenoid valve switching control circuit and a solenoid valve to solve the technical problems of long response time and low control accuracy of existing solenoid valve control methods.

[0005] In a first aspect, embodiments of this application provide a solenoid valve switching control circuit, the circuit comprising: a first switching device, a second switching device, a third switching device, and a fourth switching device connected in series;

[0006] One end of the first switching device is electrically connected to one end of the fourth switching device and the power supply / ground terminal, and the other end of the first switching device is electrically connected to one end of the second switching device and one end of the electromagnetic coil; one end of the third switching device is electrically connected to the other end of the fourth switching device and the other end of the electromagnetic coil, and the other end of the third switching device is electrically connected to the other end of the second switching device and the ground terminal / power supply terminal.

[0007] The first and second switching devices have opposite conduction directions; the third and fourth switching devices have opposite conduction directions, while the second and fourth switching devices have the same conduction direction.

[0008] In the above implementation process, the solenoid valve switching control circuit includes: a first switching device, a second switching device, a third switching device, and a fourth switching device; one end of the first switching device is electrically connected to one end of the fourth switching device and a power supply / ground terminal, and the other end of the first switching device is electrically connected to one end of the second switching device and one end of the electromagnetic coil; one end of the third switching device is electrically connected to the other end of the fourth switching device and the other end of the electromagnetic coil, and the other end of the third switching device is electrically connected to the other end of the second switching device and a ground terminal / power supply terminal. Furthermore, the conduction directions of the first and second switching devices are opposite; the conduction directions of the third and fourth switching devices are opposite, while the conduction directions of the second and fourth switching devices are the same. Based on the solenoid valve switching control circuit provided in this application, rapid opening / closing control of the solenoid valve can be achieved by controlling the coil current flow path before and after the solenoid valve is opened / closed. Therefore, based on the solenoid valve switching control circuit provided in this application, by optimizing the control circuit design, rapid opening / closing control of the solenoid valve can be achieved, improving the control accuracy of the solenoid valve. The solenoid valve switching control circuit provided in this application can effectively improve the control performance of solenoid valves and meet the higher requirements of modern industry for solenoid valve control. It solves the technical problems of long response time and low control accuracy in existing solenoid valve control methods.

[0009] Optionally, in this embodiment of the application, the first switching device includes a first switching element and a second switching element connected in parallel; the third switching device includes a third switching element and a fourth switching element connected in parallel; the first switching element and the second switching element have opposite conduction directions, the second switching element and the second switching device have the same conduction direction, the third switching element and the fourth switching element have opposite conduction directions, and the fourth switching element and the fourth switching device have the same conduction direction.

[0010] In the above implementation process, the first switching device includes a first switching element and a second switching element connected in parallel; the third switching device includes a third switching element and a fourth switching element connected in parallel. Since the conduction directions of the first and second switching elements are opposite, the conduction directions of the second switching element and the second switching device are the same, the conduction directions of the third and fourth switching elements are opposite, and the conduction directions of the fourth switching element and the fourth switching device are the same; thus, the conduction direction of the first switching element can be restricted based on the second switching element, and the conduction direction of the third switching element can be restricted based on the fourth switching element, reducing the difficulty of controlling the coil current flow path in the process of realizing rapid opening / closing control of the solenoid valve based on the solenoid valve switching control circuit.

[0011] Optionally, in this embodiment of the application, the first switching element includes a first controllable switching element, and the third switching element includes a third controllable switching element.

[0012] In the above implementation process, since the first switching element and the third switching element are respectively implemented by the first controllable switching element and the third controllable switching element, the first controllable switching element and the third controllable switching element can accurately control the conduction or closure of the corresponding circuit, so as to further improve the control accuracy of the solenoid valve switching control circuit on the solenoid valve.

[0013] Optionally, in this embodiment, the circuit further includes: a control module, which is electrically connected to a first control terminal of the first controllable switching element and a third control terminal of the third controllable switching element; the control module is configured to send a conduction control signal to the first control terminal and / or the third control terminal to control the first controllable switching element and / or the third controllable switching element to conduct; or to send a shutdown control signal to the first control terminal and / or the third control terminal to control the first controllable switching element and / or the third controllable switching element to shut down.

[0014] In the above implementation process, the control module can realize the on / off control of the first controllable switching element and / or the third controllable switching element.

[0015] Optionally, in this embodiment, the first controllable switching element and the third controllable switching element include NMOS transistors; the drain of the first controllable switching element is electrically connected to the power supply terminal, the source of the first controllable switching element is electrically connected to one end of the electromagnetic coil, and the gate of the first controllable switching element is electrically connected to the control module; the source of the third controllable switching element is electrically connected to the ground terminal, the drain of the third controllable switching element is electrically connected to the other end of the electromagnetic coil, and the gate of the third controllable switching element is electrically connected to the control module.

[0016] In the above implementation process, NMOS transistors offer fast switching speeds and low on-resistance. Using NMOS transistors to implement the first and third controllable switching elements can reduce circuit losses while ensuring the control accuracy of the solenoid valve switching control circuit. Furthermore, the manufacturing process of NMOS transistors is relatively mature and cost-effective, which can further reduce the production cost of the solenoid valve switching control circuit, thereby reducing the cost of precise control of the solenoid valve.

[0017] Optionally, in this embodiment, the second switching element includes a first diode, the second switching device includes a second diode, the fourth switching element includes a third diode, and the fourth switching device includes a fourth diode; the negative terminal of the first diode is electrically connected to the power supply terminal, and the positive terminal of the first diode is electrically connected to one end of the electromagnetic coil and the negative terminal of the second diode; the positive terminal of the second diode is electrically connected to the ground terminal and the positive terminal of the third diode; the negative terminal of the third diode is electrically connected to the other end of the electromagnetic coil and the positive terminal of the fourth diode; and the negative terminal of the fourth diode is electrically connected to the power supply terminal.

[0018] In the above implementation process, the second switching element, the second switching device, the fourth switching element, and the fourth switching device are implemented based on diodes. This can ensure that "the solenoid valve switching control circuit can achieve rapid opening / closing control of the solenoid valve by controlling the coil current flow path before and after the solenoid valve is opened / closed", while reducing the difficulty of controlling the coil current flow path in the process of achieving rapid opening / closing control of the solenoid valve, and reducing the production cost of the solenoid valve switching control circuit.

[0019] Optionally, in this embodiment of the application, the circuit further includes: a current detection module, the current detection module being electrically connected to the electromagnetic coil; the current detection module being configured to detect the current value flowing through the electromagnetic coil.

[0020] In the above implementation process, the current detection module can detect the current value flowing through the electromagnetic coil, select an appropriate coil current flow path based on the current value flowing through the electromagnetic coil, or control the on or off time of the switching device based on the current value flowing through the electromagnetic coil, thereby realizing rapid opening / closing control of the solenoid valve.

[0021] Optionally, in this embodiment, the current detection module is also electrically connected to the control module; the current detection module is further configured to send the current value flowing through the electromagnetic coil to the control module; the control module is further configured to control the on-time and off-time of the first controllable switching element based on the current value flowing through the electromagnetic coil.

[0022] In the above implementation process, the control module can control the on-time and off-time of the first controllable switching element according to the current value flowing through the electromagnetic coil, thereby realizing the rapid opening / closing control of the solenoid valve.

[0023] Optionally, in this embodiment of the application, the circuit further includes a power supply module, which is electrically connected to the power supply terminal.

[0024] In a second aspect, embodiments of this application also provide a solenoid valve, the solenoid valve comprising: a solenoid valve body, a solenoid coil, and a solenoid valve switching control circuit as described in any of the first aspects above;

[0025] The solenoid valve switch control circuit is electrically connected to the solenoid coil.

[0026] The solenoid valve switch control circuit is configured to control the solenoid valve body to be in a closed or open state by controlling the coil current of the solenoid coil.

[0027] The beneficial effects of this application are as follows: The solenoid valve switching control circuit includes a first switching device, a second switching device, a third switching device, and a fourth switching device; one end of the first switching device is electrically connected to one end of the fourth switching device and a power supply / ground terminal, and the other end of the first switching device is electrically connected to one end of the second switching device and one end of the electromagnetic coil; one end of the third switching device is electrically connected to the other end of the fourth switching device and the other end of the electromagnetic coil, and the other end of the third switching device is electrically connected to the other end of the second switching device and a ground terminal / power supply terminal. Furthermore, the conduction directions of the first and second switching devices are opposite; the conduction directions of the third and fourth switching devices are opposite, while the conduction directions of the second and fourth switching devices are the same. Based on the solenoid valve switching control circuit provided in this application, rapid opening / closing control of the solenoid valve can be achieved by controlling the coil current flow path before and after the solenoid valve is opened / closed. Therefore, based on the solenoid valve switching control circuit provided in this application, by optimizing the control circuit design, rapid opening / closing control of the solenoid valve can be achieved, improving the control accuracy of the solenoid valve. The solenoid valve switching control circuit provided in this application can effectively improve the control performance of solenoid valves and meet the higher requirements of modern industry for solenoid valve control. It solves the technical problems of long response time and low control accuracy in existing solenoid valve control methods. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A schematic diagram of a solenoid valve switch control circuit provided in an embodiment of this application;

[0030] Figure 2 This is a schematic diagram of another solenoid valve switching control circuit provided in an embodiment of this application. Detailed Implementation

[0031] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application.

[0033] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0034] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a solenoid valve switching control circuit provided in an embodiment of this application. The solenoid valve switching control circuit includes: a first switching device V1, a second switching device V2, a third switching device V3, and a fourth switching device V4 connected in series.

[0035] One end of the first switching device V1 is electrically connected to one end of the fourth switching device V4 and the power supply terminal BAT / ground terminal GND respectively; the other end of the first switching device V1 is electrically connected to one end of the second switching device V2 and one end of the electromagnetic coil L respectively; one end of the third switching device V3 is electrically connected to the other end of the fourth switching device V4 and the other end of the electromagnetic coil L respectively; the other end of the third switching device V3 is electrically connected to the other end of the second switching device V2 and the ground terminal GND / power supply terminal BAT respectively.

[0036] In this configuration, the first switching device V1 and the second switching device V2 have opposite conduction directions; the third switching device V3 and the fourth switching device V4 have opposite conduction directions, while the second switching device V2 and the fourth switching device V4 have the same conduction direction.

[0037] in, Figure 1The diagram illustrates a scenario where "one end of the first switching device V1 is electrically connected to one end of the fourth switching device V4 and the power supply terminal BAT." Alternatively, one end of the first switching device V1 can be electrically connected to one end of the fourth switching device V4 and the ground terminal GND. In this case, the other end of the third switching device V3 is electrically connected to the other end of the second switching device V2 and the power supply terminal BAT. The first switching device V1, the second switching device V2, the third switching device V3, or the fourth switching device V4 can be implemented using controllable switching elements (e.g., gate turn-off thyristors, power MOSFETs, or insulated-gate bipolar transistors) or switching devices such as diodes. The specific implementations of the first switching device V1, the second switching device V2, the third switching device V3, or the fourth switching device V4 can be the same or not entirely the same. For example, the first switching device V1, the second switching device V2, the third switching device V3, and the fourth switching device V4 can all be implemented by controllable switching elements; or, the first switching device V1 and the third switching device V3 can be implemented by controllable switching elements, while the second switching device V2 and the fourth switching device V4 can be implemented by diodes. The specific implementation of the first switching device V1, the second switching device V2, the third switching device V3, and the fourth switching device V4 can be adjusted according to the actual solenoid valve switching control requirements, and this application does not impose specific limitations on this.

[0038] For example, when the solenoid valve is in the open state, the first switching device V1 and the third switching device V3 (or the second switching device V2 and the fourth switching device V4) can be in the conducting state to provide a current flow path for the solenoid coil. In the case where "one end of the first switching device V1 is electrically connected to one end of the fourth switching device V4 and the power supply terminal BAT, and the other end of the third switching device V3 is electrically connected to the other end of the second switching device V2 and the ground terminal GND," and "when the solenoid valve is in the open state, the first switching device V1 and the third switching device V3 are in the conducting state to provide a current flow path for the solenoid coil (current flows from one end of the first switching device V1 to the other end, and from one end of the third switching device V3 to the other end)," during the solenoid valve's closing process, the second switching device V2 and the fourth switching device V4 can be switched to the conducting state, and the first switching device V1 and the third switching device V3 can be switched to the closing state (after switching, the second switching device V2 and the fourth switching device V4 provide a current flow path for the solenoid coil). Because "the first switching device V1 and the second switching device V2 have opposite conduction directions; the third switching device V3 and the fourth switching device V4 have opposite conduction directions", the current flowing through the electromagnetic coil will quickly drop to the shut-off current threshold, thus achieving rapid shut-off of the solenoid valve.

[0039] For example, when the solenoid valve is in the closed state, the second switching device V2 and the third switching device V3 (or the first switching device V1 and the fourth switching device V4) can be in the conducting state to provide a current flow path for the solenoid coil, maintaining the coil current at a value lower than the opening current threshold but greater than 0. In the case where "one end of the first switching device V1 is electrically connected to one end of the fourth switching device V4 and the power supply terminal BAT, and the other end of the third switching device V3 is electrically connected to the other end of the second switching device V2 and the ground terminal GND," and "when the solenoid valve is in the closed state, the second switching device V2 and the third switching device V3 are in the conducting state to provide a current flow path for the solenoid coil, maintaining the coil current at a value lower than the opening current threshold but greater than 0 (current flows from the other end of the second switching device V2 to one end of the second switching device V2, and from one end of the third switching device V3 to the other end of the third switching device V3)," during the opening of the solenoid valve, the first switching device V1 can be controlled to switch to the conducting state, and the second switching device V2 can be controlled to switch to the closed state. Since "when the solenoid valve is in the closed state, the second switching device V2 and the third switching device V3 are in the conducting state to provide a current flow path for the solenoid coil and maintain the coil current at a value lower than the opening current threshold but greater than 0", and "the first switching device V1 switches to the conducting state to control the second switching device V2 to switch to the off state", the time required for the coil current to rise to the opening current threshold can be reduced, thereby improving the opening speed of the solenoid valve.

[0040] Therefore, the solenoid valve switching control circuit provided in this application can achieve rapid opening / closing control of the solenoid valve by controlling the coil current flow path before and after the solenoid valve opens / closes. Thus, based on the solenoid valve switching control circuit provided in this application, by optimizing the control circuit design, rapid opening / closing control of the solenoid valve can be achieved, improving the control accuracy of the solenoid valve. The solenoid valve switching control circuit provided in this application can effectively improve the control performance of the solenoid valve, meeting the higher requirements of modern industry for solenoid valve control. It solves the technical problems of long response time and low control accuracy in existing solenoid valve control methods.

[0041] In some optional embodiments, the first switching device V1 includes a first switching element and a second switching element connected in parallel; the third switching device V3 includes a third switching element and a fourth switching element connected in parallel; the first switching element and the second switching element have opposite conduction directions, the second switching element and the second switching device V2 have the same conduction direction, the third switching element and the fourth switching element have opposite conduction directions, and the fourth switching element and the fourth switching device V4 have the same conduction direction.

[0042] The first and second switching elements can both be implemented using controllable switching elements (e.g., gate turn-off thyristors, power MOSFETs, or insulated-gate bipolar transistors), or they can be implemented using a controllable switching element and a diode, respectively. Similarly, the third and fourth switching elements can both be implemented using controllable switching elements, or they can be implemented using a controllable switching element and a diode, respectively. This application does not impose specific limitations on this. Since the first and second switching elements have opposite conduction directions, the second switching element and the second switching device V2 have the same conduction direction, the third and fourth switching elements have opposite conduction directions, and the fourth switching element and the fourth switching device V4 have the same conduction direction; thus, the conduction direction of the first switching element can be restricted based on the second switching element, and the conduction direction of the third switching element can be restricted based on the fourth switching element, reducing the difficulty of controlling the coil current flow path during the rapid opening / closing control of the solenoid valve based on this solenoid valve switching control circuit.

[0043] Please refer to Figure 2 , Figure 2 This is a schematic diagram of another solenoid valve switch control circuit provided in an embodiment of this application. In some optional embodiments, the first switching element includes a first controllable switching element Q1, and the third switching element includes a third controllable switching element Q3.

[0044] The first controllable switching element Q1 or the third controllable switching element Q3 can be implemented by controllable switching elements such as gate turn-off thyristors, power MOSFETs or insulated gate bipolar transistors. Figure 2 The diagram illustrates the implementation of the first controllable switching element Q1 and the third controllable switching element Q3 using power MOSFETs (specifically, NMOS transistors). Since the first and third switching elements are implemented using the first controllable switching element Q1 and the third controllable switching element Q3 respectively, the first and third controllable switching elements Q1 and Q3 can precisely control the on / off state of the corresponding circuits, thereby further improving the control accuracy of the solenoid valve switching control circuit.

[0045] In some optional embodiments, the circuit further includes: a control module electrically connected to a first control terminal of a first controllable switching element Q1 and a third control terminal of a third controllable switching element Q3; the control module is configured to send a conduction control signal to the first control terminal and / or the third control terminal to control the first controllable switching element Q1 and / or the third controllable switching element Q3 to conduct; or to send a shutdown control signal to the first control terminal and / or the third control terminal to control the first controllable switching element Q1 and / or the third controllable switching element Q3 to shut down.

[0046] The control module can be implemented by a microcontroller, a single-chip microcomputer, or a programmable logic control unit. When the first controllable switching element Q1 / the third controllable switching element Q3 is implemented using a power MOSFET, the first control terminal / the third control terminal can be the gate of the power MOSFET. Based on the control module, the on / off control of the first controllable switching element Q1 and / or the third controllable switching element Q3 can be achieved. Specifically, the implementation of "sending an on control signal to the first control terminal and / or the third control terminal to control the first controllable switching element Q1 and / or the third controllable switching element Q3 to be on; or sending an off control signal to the first control terminal and / or the third control terminal to control the first controllable switching element Q1 and / or the third controllable switching element Q3 to be off" can be based on existing switching element on / off control methods.

[0047] In some optional embodiments, the first controllable switching element Q1 and the third controllable switching element Q3 include NMOS transistors; the drain of the first controllable switching element Q1 is electrically connected to the power supply terminal BAT, the source of the first controllable switching element Q1 is electrically connected to one end of the electromagnetic coil L, and the gate of the first controllable switching element Q1 is electrically connected to the control module; the source of the third controllable switching element Q3 is electrically connected to the ground terminal GND, the drain of the third controllable switching element Q3 is electrically connected to the other end of the electromagnetic coil L, and the gate of the third controllable switching element Q3 is electrically connected to the control module.

[0048] Among them, NMOS transistors have fast switching speed and low on-resistance. Using NMOS transistors to implement the first controllable switching element Q1 and the third controllable switching element Q3 can reduce circuit losses while ensuring the control accuracy of the solenoid valve switching control circuit. Moreover, the manufacturing process of NMOS transistors is relatively mature and the cost is low, which can further reduce the production cost of the solenoid valve switching control circuit, thereby reducing the cost of precise control of the solenoid valve.

[0049] like Figure 2 As shown, in some optional embodiments, the second switching element includes a first diode D1, the second switching device V2 includes a second diode D2, the fourth switching element includes a third diode D3, and the fourth switching device V4 includes a fourth diode D4; the negative terminal of the first diode D1 is electrically connected to the power supply terminal BAT, and the positive terminal of the first diode D1 is electrically connected to one end of the electromagnetic coil L and the negative terminal of the second diode D2; the positive terminal of the second diode D2 is electrically connected to the ground terminal GND and the positive terminal of the third diode D3; the negative terminal of the third diode D3 is electrically connected to the other end of the electromagnetic coil L and the positive terminal of the fourth diode D4; the negative terminal of the fourth diode D4 is electrically connected to the power supply terminal BAT.

[0050] Among them, the second switching element, the second switching device V2, the fourth switching element, and the fourth switching device V4 are implemented based on diodes. This can ensure that "the solenoid valve switching control circuit can achieve rapid opening / closing control of the solenoid valve by controlling the coil current flow path before and after the solenoid valve is opened / closed", while reducing the difficulty of controlling the coil current flow path in the process of achieving rapid opening / closing control of the solenoid valve, and reducing the production cost of the solenoid valve switching control circuit.

[0051] In some optional embodiments, the circuit further includes a current detection module electrically connected to the electromagnetic coil L; the current detection module is configured to detect the current value flowing through the electromagnetic coil L.

[0052] The current detection module can be implemented using a current sensing device based on a current transformer or a current sensing device based on a Rogowski coil. The current detection module can detect the current flowing through the electromagnetic coil L, and select an appropriate current flow path based on this current value, or control the on / off time of the switching device based on the current flowing through the electromagnetic coil L, thereby achieving rapid opening / closing control of the solenoid valve.

[0053] In some optional embodiments, the current detection module is also electrically connected to the control module; the current detection module is also configured to send the current value flowing through the electromagnetic coil L to the control module; the control module is also configured to control the on-time and off-time of the first controllable switching element Q1 based on the current value flowing through the electromagnetic coil L.

[0054] Specifically, the PWM frequency and duty cycle of the first controllable switching element Q1 can be controlled based on the current flowing through the electromagnetic coil L and the turn-on current threshold, so as to keep the turn-off coil current within a current range close to but below the turn-on current threshold. Since the control module can control the on-time and off-time of the first controllable switching element Q1 based on the current flowing through the electromagnetic coil, rapid on / off control of the solenoid valve can be achieved. The specific implementation of "controlling the on-time and off-time of the first controllable switching element Q1 based on the current flowing through the electromagnetic coil L" can be based on existing methods for controlling the on / off time of switching elements.

[0055] In some alternative embodiments, the circuit further includes a power module electrically connected to a power supply terminal BAT.

[0056] The power module can be implemented using a battery or a switching power supply, etc.

[0057] This application embodiment also provides a solenoid valve, which includes: a solenoid valve body, a solenoid coil, and a solenoid valve switching control circuit as described in any of the first aspects above.

[0058] The solenoid valve switch control circuit is electrically connected to the solenoid coil.

[0059] The solenoid valve switch control circuit is configured to control the solenoid valve body to be in a closed state or an open state by controlling the coil current of the solenoid coil.

[0060] The solenoid valve body may include multiple parts such as the valve body, valve core, spring, and seals.

[0061] It should be understood that this solenoid valve corresponds to the embodiment of the solenoid valve switching control circuit described above. The specific implementation of this solenoid valve can be found in the description above. To avoid repetition, a detailed description is omitted here.

[0062] It should be understood that the disclosed circuits / systems in the several embodiments provided in this application can also be implemented in other ways. The circuit embodiments described above are merely illustrative. For example, the block diagrams in the accompanying drawings show the possible architecture, functions, and operations of circuits implemented according to various embodiments of this application. Each block in the block diagram can represent a module or a part of a module. In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0063] The above description is only an optional implementation of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application.

Claims

1. A solenoid valve switching control circuit, characterized in that, The circuit includes: a first switching device, a second switching device, a third switching device, and a fourth switching device connected in series; One end of the first switching device is electrically connected to one end of the fourth switching device and the power supply / ground terminal, and the other end of the first switching device is electrically connected to one end of the second switching device and one end of the electromagnetic coil; one end of the third switching device is electrically connected to the other end of the fourth switching device and the other end of the electromagnetic coil, and the other end of the third switching device is electrically connected to the other end of the second switching device and the ground terminal / power supply terminal. The first and second switching devices have opposite conduction directions; the third and fourth switching devices have opposite conduction directions, while the second and fourth switching devices have the same conduction direction.

2. The circuit according to claim 1, characterized in that, in, The first switching device includes a first switching element and a second switching element connected in parallel; the third switching device includes a third switching element and a fourth switching element connected in parallel. The first switching element and the second switching element have opposite conduction directions, the second switching element and the second switching device have the same conduction direction, the third switching element and the fourth switching element have opposite conduction directions, and the fourth switching element and the fourth switching device have the same conduction direction.

3. The circuit according to claim 2, characterized in that, in, The first switching element includes a first controllable switching element, and the third switching element includes a third controllable switching element.

4. The circuit according to claim 3, characterized in that, The circuit further includes a control module, which is electrically connected to the first control terminal of the first controllable switching element and the third control terminal of the third controllable switching element. The control module is configured to send a conduction control signal to the first control terminal and / or the third control terminal to control the first controllable switching element and / or the third controllable switching element to conduct; or to send a shutdown control signal to the first control terminal and / or the third control terminal to control the first controllable switching element and / or the third controllable switching element to shut down.

5. The circuit according to claim 4, characterized in that, in, The first controllable switching element and the third controllable switching element include NMOS transistors; The drain of the first controllable switching element is electrically connected to the power supply terminal, the source of the first controllable switching element is electrically connected to one end of the electromagnetic coil, and the gate of the first controllable switching element is electrically connected to the control module; the source of the third controllable switching element is electrically connected to the ground terminal, the drain of the third controllable switching element is electrically connected to the other end of the electromagnetic coil, and the gate of the third controllable switching element is electrically connected to the control module.

6. The circuit according to claim 5, characterized in that, in, The second switching element includes a first diode, the second switching device includes a second diode, the fourth switching element includes a third diode, and the fourth switching device includes a fourth diode; The negative terminal of the first diode is electrically connected to the power supply terminal, and the positive terminal of the first diode is electrically connected to one end of the electromagnetic coil and the negative terminal of the second diode, respectively. The positive terminal of the second diode is electrically connected to both the ground terminal and the positive terminal of the third diode. The negative terminal of the third diode is electrically connected to the other end of the electromagnetic coil and the positive terminal of the fourth diode, respectively. The negative terminal of the fourth diode is electrically connected to the power supply terminal.

7. The circuit according to claim 4, characterized in that, The circuit further includes a current detection module, which is electrically connected to the electromagnetic coil. The current detection module is configured to detect the current value flowing through the electromagnetic coil.

8. The circuit according to claim 7, characterized in that, in, The current detection module is also electrically connected to the control module; The current detection module is also configured to send the current value flowing through the electromagnetic coil to the control module; The control module is also configured to control the on-time and off-time of the first controllable switching element based on the current value flowing through the electromagnetic coil.

9. The circuit according to any one of claims 1-7, characterized in that, The circuit further includes a power supply module, which is electrically connected to the power supply terminal.

10. A solenoid valve, characterized in that, The solenoid valve includes: a solenoid valve body, a solenoid coil, and a solenoid valve switching control circuit as described in any one of claims 1-9 above. The solenoid valve switch control circuit is electrically connected to the solenoid coil. The solenoid valve switching control circuit is configured to control the solenoid valve body to be in a closed state or an open state by controlling the coil current of the solenoid coil.

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