Solenoid valve circuit and solenoid valve

Abstract

The electromagnetic valve circuit and the electromagnetic valve relate to the technical field of electromagnetic valves. The electromagnetic valve circuit comprises a power supply circuit, a control circuit and a driving circuit. The power supply circuit is connected in series between a power module and a first input end of the driving circuit, so that the power module supplies power to the driving circuit through the power supply circuit. An output end of the driving circuit is connected to an electromagnetic valve interface, so as to provide a coil voltage to the electromagnetic valve. The control circuit comprises a control chip. An output end of the power supply circuit is connected to a voltage detection end of the control chip and a voltage input end of the control chip. A control end of the control chip is connected to a second input end of the driving circuit, so as to output a pulse width modulation signal to the driving circuit. The driving circuit adjusts the coil voltage input to the electromagnetic valve according to the voltage of the first input end and the pulse width modulation signal of the second input end. The electromagnetic valve circuit disclosed by the present application can reduce the power consumption and temperature rise of the electromagnetic valve coil during power-on.

Description

Technical Field

[0001] This disclosure relates to the field of solenoid valve technology, and more specifically, to a solenoid valve circuit and a solenoid valve. Background Technology

[0002] Currently, solenoid valves are commonly used in fluid control technology to adjust the flow direction of liquids and achieve functions such as pipeline switching. When the solenoid valve coil is energized, it generates power consumption and temperature rise. Solenoid valves in related technologies have high energy consumption and high temperature rise, which affects the product lifespan. Utility Model Content

[0003] This disclosure provides a solenoid valve circuit and a solenoid valve that can reduce power consumption and temperature rise when the solenoid valve coil is energized.

[0004] According to one aspect of this disclosure, a solenoid valve circuit is provided, including a power supply circuit, a control circuit, and a drive circuit; the power supply circuit is connected in series between a power module and a first input terminal of the drive circuit, so that the power module supplies power to the drive circuit through the power supply circuit; the output terminal of the drive circuit is connected to a solenoid valve interface to provide coil voltage to the solenoid valve. The control circuit includes a control chip. The output terminal of the power supply circuit is connected to the voltage detection terminal and the voltage input terminal of the control chip. The control terminal of the control chip is connected to the second input terminal of the drive circuit to output a pulse width modulation signal to the drive circuit. The drive circuit adjusts the coil voltage of the input solenoid valve according to the voltage of the first input terminal and the pulse width modulation signal of the second input terminal.

[0005] In one exemplary embodiment of this disclosure, the power supply circuit includes a first diode and a second diode. The input terminal of the first diode is connected to the power supply module, and the output terminal of the first diode is connected to the output terminal of the power supply circuit. The input terminal of the second diode is grounded, and the output terminal of the second diode is connected to the power supply module.

[0006] In one exemplary embodiment of this disclosure, a first inductor and a first diode are connected in series between the output terminal of the power supply module and the power supply circuit; at least one capacitor is provided between the anode of the first diode and the ground terminal of the power supply circuit; at least one capacitor is provided between the cathode of the first diode and the ground terminal of the power supply circuit.

[0007] In one exemplary embodiment of this disclosure, the solenoid valve interface includes a first solenoid valve interface and a second solenoid valve interface. The first solenoid valve interface is connected to a first input terminal, and the second solenoid valve interface is grounded. The drive circuit includes a first switching transistor and a second switching transistor. The first switching transistor is located between the first input terminal and the first solenoid valve interface, and the second switching transistor is located between the first input terminal and the ground terminal of the drive circuit.

[0008] In one exemplary embodiment of this disclosure, the source of the first switching transistor is connected to the first input terminal, and the drain of the first switching transistor is connected to the first solenoid valve interface through a second inductor; the collector of the second switching transistor is connected to the first input terminal through a first resistor and a second resistor connected in parallel, and the emitter of the second switching transistor is connected to the ground terminal of the driving circuit; the gate of the first switching transistor is connected to the emitter of the second switching transistor, and the base of the second switching transistor is connected to the second input terminal through a third resistor, and the base of the second switching transistor is also connected to the ground terminal of the driving circuit through a fourth resistor.

[0009] In one exemplary embodiment of this disclosure, a sixth resistor and an eighth resistor are connected in series between the first solenoid valve interface and the second solenoid valve interface. The voltage between the sixth resistor and the eighth resistor is connected to the voltage feedback terminal of the control chip, and the control chip is used to control the pulse width modulation signal according to the voltage of the voltage feedback terminal.

[0010] In one exemplary embodiment of this disclosure, the output terminal of the power supply circuit is connected to the voltage detection terminal of the control chip through a fifth resistor. The control chip is used to output a first pulse width modulation signal to the drive circuit through the control terminal of the control chip when the voltage at the voltage detection terminal of the control chip is greater than or equal to 9V.

[0011] In one exemplary embodiment of this disclosure, the control chip is used to output a second pulse width modulation signal to the driving circuit through the control terminal of the control chip when the first pulse width modulation signal is output for a first preset time. The duty cycle of the second pulse width modulation signal is less than the duty cycle of the first pulse width modulation signal.

[0012] In one exemplary embodiment of this disclosure, a voltage conversion chip is connected in series between the output terminal of the power supply circuit and the voltage input terminal of the control chip. The voltage conversion chip is used to convert the 12V voltage at the output terminal of the power supply circuit into the 5V voltage at the voltage input terminal of the control chip.

[0013] According to another aspect of this disclosure, a solenoid valve is provided, including a valve assembly and a coil assembly; the coil assembly includes an electrically connected coil and a circuit board; the solenoid valve circuit of any of the preceding claims is disposed on the circuit board, and the solenoid valve interface is disposed on the coil.

[0014] In one exemplary embodiment of this disclosure, the solenoid valve further includes a magnetic guide frame and a protective housing; the magnetic guide frame is mounted on the valve assembly, and the coil is located within the coil mounting space formed by the magnetic guide frame; the coil and the circuit board are disposed within the protective housing, and the protective housing is partially mounted within the coil mounting space and is separately disposed from the magnetic guide frame.

[0015] The solenoid valve circuit disclosed herein can control the coil voltage of the solenoid valve coil through a pulse width modulation signal output by a control chip. This allows for the provision of different input voltages to the coil based on the solenoid valve's operating state and actual requirements, maintaining the coil voltage at the minimum necessary operating voltage. This reduces product temperature rise and extends product lifespan. Furthermore, because the coil voltage of the solenoid valve using this disclosed circuit is adjustable, the solenoid valve can be matched with various power supplies, reducing the need for user-side control and thus broadening its application.

[0016] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0018] Figure 1 This is a schematic diagram of the solenoid valve circuit of this disclosure.

[0019] Figure 2 This is a schematic diagram of the power supply circuit in one exemplary embodiment of the solenoid valve circuit of this disclosure.

[0020] Figure 3 This is a schematic diagram showing the connection between the output terminal of the power supply circuit and the voltage detection terminal of the control chip in one exemplary embodiment of the solenoid valve circuit of this disclosure.

[0021] Figure 4 This is a schematic diagram of the control chip in one exemplary embodiment of the solenoid valve circuit disclosed herein.

[0022] Figure 5 This is a schematic diagram showing the connection between the output terminal of the power supply circuit and the voltage input terminal of the control chip in one exemplary embodiment of the solenoid valve circuit disclosed herein.

[0023] Figure 6 This is a schematic diagram of the drive circuit in one exemplary embodiment of the solenoid valve circuit of this disclosure.

[0024] Figure 7 This is a schematic diagram of an exemplary embodiment of the solenoid valve disclosed herein.

[0025] Figure 8 This is a schematic diagram of an exemplary embodiment of the solenoid valve disclosed herein from another perspective.

[0026] Figure 9 This is a schematic diagram of the valve assembly and magnetic guide frame in an exemplary embodiment of the solenoid valve disclosed herein.

[0027] Figure 10 This is a schematic diagram of the magnetic guide frame and protective housing in an exemplary embodiment of the solenoid valve disclosed herein.

[0028] Explanation of reference numerals in the attached figures: 101. Cylindrical surface; 3. Magnetic guide frame; 31. First horizontal plate; 32. First vertical plate; 33. Second horizontal plate; 34. Clearance section; 4. Protective housing; 41. Coil protection section; 42. Circuit board protection section; 43. Coil support section; 44. Wiring section. Detailed Implementation

[0029] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore detailed descriptions of them will be omitted. Furthermore, the drawings are merely illustrative of this disclosure and are not necessarily drawn to scale.

[0030] Unless otherwise specified or stated, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “a,” “an,” “the,” “the,” and “at least one” are used to indicate the presence of one or more elements / components / etc.; the terms “comprising” and “having” are used to indicate an open-ended inclusion and to mean that there may be other elements / components / etc. in addition to those listed; the terms “first” and “second” are used only as illustrative marks and are not intended to limit the number, importance, or order of the objects.

[0031] The terms “connection” and “fixation” should be interpreted broadly. For example, “connection” can be a fixed connection, a movable connection, an integral connection, or a detachable connection. It can be a direct connection or an indirect connection through an intermediate medium.

[0032] Furthermore, it should be understood that the directional terms such as "top / bottom," "upper / lower," and "inner / outer" described in the exemplary embodiments of this disclosure are merely used to indicate relative positional relationships. For convenience, descriptions are made based on angles shown in the accompanying drawings, or on the general understanding of solenoid valves in the art, and should not be construed as limiting the exemplary embodiments of this disclosure. For example, unless otherwise specified, in the description of this disclosure, the axial direction of the solenoid valve assembly is used as a reference, the iron core of the valve assembly is considered "upper / top," and the valve port of the valve assembly is considered "lower / bottom," and this reference direction is consistent with the reference of the accompanying drawings provided in this disclosure. Those skilled in the art will understand that when the absolute position of the described object changes, the relative positional relationship may also change accordingly; "upper" may become "lower," "left," or "right," and such changes will not hinder the understanding of those skilled in the art.

[0033] According to a first aspect of this disclosure, a solenoid valve circuit is provided, with reference to... Figure 1 as well as Figure 2 As shown, the solenoid valve circuit includes a power supply circuit, a control circuit, and a drive circuit; the power supply circuit is connected in series between the power module and the first input terminal of the drive circuit so that the power module supplies power to the drive circuit through the power supply circuit; the output terminal of the drive circuit is connected to the solenoid valve interface to provide coil voltage to the solenoid valve. The control circuit includes a control chip. The output terminal of the power supply circuit is connected to the voltage detection terminal and the voltage input terminal of the control chip. The control terminal of the control chip is connected to the second input terminal of the drive circuit to output a pulse width modulation signal to the drive circuit. The drive circuit adjusts the coil voltage of the input solenoid valve according to the voltage of the first input terminal and the pulse width modulation signal of the second input terminal.

[0034] Specifically, Figure 1 A schematic diagram of the solenoid valve circuit architecture of this disclosure is shown. Figure 2 A schematic diagram of the power supply circuit is shown. Figures 3 to 4 A schematic diagram showing the connection between the output terminal of the power supply circuit and the voltage detection terminal of the control chip is shown. Figure 4 A schematic diagram of the control chip is shown. Figure 5 A schematic diagram showing the connection between the output terminal of the power supply circuit and the voltage input terminal of the control chip is shown. Figure 6 A schematic diagram of the drive circuit is shown.

[0035] refer to Figures 1 to 6 The power module supplies power to the control chip and the drive circuit through the power supply circuit. The control chip can collect the input working voltage according to the voltage detection terminal and adjust the pulse width modulation signal output to the drive circuit according to the input working voltage. The drive circuit adjusts the voltage of the first input terminal to the coil voltage of the input solenoid valve coil according to the input pulse width modulation signal.

[0036] The solenoid valve circuit disclosed herein can control the coil voltage of the solenoid valve coil through a pulse width modulation signal output by a control chip. This allows for the provision of different input voltages to the coil based on the solenoid valve's operating state and actual requirements, maintaining the coil voltage at the minimum necessary operating voltage. This reduces product temperature rise and extends product lifespan. Furthermore, because the coil voltage of the solenoid valve using this disclosed circuit is adjustable, the solenoid valve can be matched with various power supplies, reducing the need for user-side control and thus broadening its application.

[0037] For example, compared to directly connecting the coil pin to the power module and directly outputting the power supply voltage to the solenoid valve coil, the solenoid valve circuit of this disclosure can maintain the coil voltage at a larger value when the solenoid valve is open, thereby providing sufficient electromagnetic force to the coil. The moving iron core and the stationary iron core of the valve assembly can be fully attracted to ensure reliable start-up of the solenoid valve. In the holding state after the solenoid valve is fully open, the electromagnetic force required to maintain the attraction between the moving iron core and the stationary iron core is relatively small. The solenoid valve circuit of this disclosure can reduce the coil voltage, thereby reducing the coil temperature rise and improving reliability. At the same time, the number of enameled wire turns can be reduced, thus reducing costs.

[0038] For example, when a solenoid valve using the solenoid valve circuit of this disclosure is matched with a power supply module of different voltage, the coil voltage can be controlled by the solenoid valve circuit to convert the voltage of the power supply module into the required coil voltage, thereby improving the adaptability of the solenoid valve to the power supply module.

[0039] In one exemplary embodiment of this disclosure, reference is made to Figure 2 As shown, the power supply circuit includes a first diode D1 and a second diode D2. VBAT represents the input terminal where the power module outputs the power supply voltage to the power supply circuit, V12V represents the output terminal of the power supply circuit, and GND represents the ground terminal of the circuit. The input terminal of the first diode D1 is connected to the power module, and the output terminal of the first diode D1 is connected to the output terminal V12V of the power supply circuit. The input terminal of the second diode D2 is grounded, and the output terminal of the second diode D2 is connected to the input terminal VBAT of the power supply circuit. The second diode D2 can prevent the power supply circuit input terminal VBAT from being reverse-connected to the ground terminal GND, thus improving the safety of the solenoid valve circuit.

[0040] In one exemplary embodiment of this disclosure, reference is made to Figure 2 As shown, a first inductor L1 and a first diode D1 are connected in series between the power supply voltage input terminal VBAT and the output terminal V12V of the power supply circuit; at least one capacitor is provided between the anode of the first diode D1 and the ground terminal GND of the power supply circuit. For example, refer to... Figure 2As shown, capacitors C6 and C7 are provided between the anode of the first diode D1 and the ground terminal GND of the power supply circuit. For example, the inductance of the first inductor L1 is 10uH; the capacitance of capacitor C6 is 4.7uF, and the capacitance of capacitor C7 is 0.1uF.

[0041] In one exemplary embodiment of this disclosure, at least one capacitor is provided between the cathode of the first diode D1 and the ground terminal GND of the power supply circuit. For example, refer to... Figure 2 As shown, capacitors C1, C2, C3, C4, and C5 are provided between the cathode of the first diode D1 and the ground terminal GND of the power supply circuit. For example, multiple capacitors with equal capacitance are provided between the cathode of the first diode D1 and the ground terminal GND of the power supply circuit. For instance, the capacitances of capacitors C1, C2, C3, C4, and C5 are all 10uF.

[0042] In one exemplary embodiment of this disclosure, reference is made to Figure 6 As shown, the solenoid valve interface includes a first solenoid valve interface and a second solenoid valve interface, which are respectively labeled as follows: Figure 6 The drive circuit shown depicts pins 1 and 2 of connector J1. Since the first input terminal of the drive circuit is connected to the output terminal of the power supply circuit, it is also labeled V12V. The second input terminal is used to receive pulse width modulation signals and is labeled PWM. GND represents the circuit's ground terminal. (Reference) Figure 6 As shown, the first solenoid valve interface is connected to the first input terminal V12V, and the second solenoid valve interface is connected to the ground terminal GND. The driving circuit may include a first switching transistor Q1 and a second switching transistor Q2; the first switching transistor Q1 is located between the first input terminal V12V and the first solenoid valve interface, and the second switching transistor Q2 is located between the first input terminal V12V and the ground terminal GND of the driving circuit.

[0043] Specifically, refer to Figure 6 As shown, the source of the first switching transistor Q1 is connected to the first input terminal V12V, and the drain of the first switching transistor Q1 is connected to the first solenoid valve interface through the second inductor L2; the collector of the second switching transistor Q2 is connected to the first input terminal V12V through the first resistor R1 and the second resistor R2 connected in parallel, and the emitter of the second switching transistor Q2 is connected to the ground terminal GND of the driving circuit; the gate of the first switching transistor Q1 is connected to the emitter of the second switching transistor Q2, and the base of the second switching transistor Q2 is connected to the second input terminal PWM through the third resistor R3, and the base of the second switching transistor Q2 is also connected to the ground terminal GND of the driving circuit through the fourth resistor R4.

[0044] The drive circuit can control the voltage of the input solenoid valve interface J1 according to the duty cycle of the pulse width modulation signal at the second input terminal. For example, the duty cycle of the pulse width modulation signal corresponds one-to-one with the coil voltage of the input solenoid valve of the drive circuit, so that the drive circuit can convert the fixed voltage of the first input terminal V12V into the required coil voltage according to the pulse width modulation signal output by the control chip U1.

[0045] For example, the first switch Q1 is a field-effect transistor, and the second switch Q2 is a transistor. The inductance of the second inductor L2 is 3.3uH, the resistances of the first resistor R1, the second resistor R2, and the third resistor R3 are all 10kΩ, and the resistance of the fourth resistor R4 is 100kΩ.

[0046] refer to Figure 6 As shown, in an exemplary embodiment of this disclosure, the drain of the first switching transistor Q1 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to the ground terminal GND of the driving circuit. An electrolytic capacitor EC1 and a capacitor C9 are connected in parallel between the first solenoid valve interface and the second solenoid valve interface. Exemplarily, the capacitance of the electrolytic capacitor EC1 is 220uF, and the capacitance of the capacitor C9 is 0.1uF.

[0047] In one exemplary embodiment of this disclosure, reference is made to Figure 6 as well as Figure 4 As shown, a sixth resistor R6 and an eighth resistor R8 are connected in series between the first solenoid valve interface and the second solenoid valve interface. The voltage between the sixth resistor R6 and the eighth resistor R8 is connected to the voltage feedback terminal (Votage_FeedBack) of the control chip U1. The control chip U1 controls the pulse width modulation signal based on the voltage at the Voltage_FeedBack terminal. The voltage between the voltage divider resistors R6 and R8 is positively correlated with the coil voltage of the solenoid valve. The control chip U1 can monitor the operating coil voltage of the solenoid valve using the Voltage_FeedBack pin. When there is a deviation between the operating coil voltage and the target voltage, the control chip U1 adjusts the operating coil voltage of the solenoid valve by adjusting the pulse width modulation signal output from the control terminal, for example, by changing the duty cycle of the pulse width modulation signal, to make it consistent with the target voltage. This exemplary embodiment improves the accuracy of solenoid valve coil voltage regulation by monitoring the operating coil voltage of the solenoid valve through the Voltage_FeedBack pin.

[0048] In one exemplary embodiment of this disclosure, reference is made to Figure 3As shown, the output terminal V12V of the power supply circuit is connected to the voltage detection terminal Input_Votage of the control chip U1 through the fifth resistor R5. For example, a capacitor C8 is also provided between the output terminal V12V of the power supply circuit and the ground terminal GND, with a capacitance of, for example, 4.7uF. The fifth resistor R5 and the seventh resistor R7 are connected in series between the output terminal V12V of the power supply circuit and the ground terminal GND. The resistance of the fifth resistor R5 is, for example, 820kΩ, and the resistance of the seventh resistor R7 is, for example, 150kΩ. The interface connecting the power supply circuit and the power module is connector J2, as shown in the reference diagram. Figure 3 As shown, pin 1 of connector J2 is grounded, and pin 2 of connector J2 is connected to the input terminal VBAT of the power supply circuit.

[0049] In one exemplary embodiment of this disclosure, the control chip U1 outputs a first pulse width modulation signal to the drive circuit via its control terminal PWM when the voltage at its voltage detection terminal Input_Votage is greater than or equal to 9V. Exemplarily, after the power supply circuit and the control chip U1 are powered on, the voltage at the voltage detection terminal Input_Votage gradually increases. When the voltage at Input_Votage reaches 9-16V, the power supply to the power module enters a stable phase. When the voltage at the voltage detection terminal Input_Votage is greater than or equal to 9V, the control chip U1 outputs the first pulse width modulation signal, corresponding to the first coil voltage, causing the solenoid valve to start working. This prevents the solenoid valve from operating under unstable power supply conditions of the power module and power supply circuit, thus protecting the solenoid valve circuit.

[0050] In one exemplary embodiment of this disclosure, the control chip U1 is used to output a second pulse width modulation signal to the driving circuit through its control terminal when the first pulse width modulation signal is output for a first preset time. The duty cycle of the second pulse width modulation signal is less than that of the first pulse width modulation signal. For example, the control chip U1 may output the second pulse width modulation signal to the driving circuit 1 minute after outputting the first pulse width modulation signal. Alternatively, the control chip U1 may output the second pulse width modulation signal to the driving circuit 2 minutes after outputting the first pulse width modulation signal. The duty cycle of the second pulse width modulation signal is less than that of the first pulse width modulation signal; for example, the duty cycle of the first pulse width modulation signal is 80%, and the duty cycle of the second pulse width modulation signal is 60%; or, for example, the duty cycle of the first pulse width modulation signal is 85%, and the duty cycle of the second pulse width modulation signal is 55%.

[0051] refer to Figure 4 as well as Figure 5As shown, the RST_TGT pin is the power-on reset pin; SWD_DIO is the serial data pin, used for data reading and writing; SWD_CLK is the serial clock pin, used to provide the required clock signal; and RESET is the reset pin. The voltage input terminal VDD of the control chip U1 is identified as V5V, and the VSS pin of the control chip U1 is grounded. Capacitors C11, C12, and C13 can be placed between the VDD and VSS pins. For example, capacitor C11 has a capacitance of 0.1uF, capacitor C12 has a capacitance of 10uF, and capacitor C13 has a capacitance of 0.1uF. The programming port of the control chip U1 is shown in connector J3. Pin 1 of connector J3 is the V5V pin, pin 2 is the ground (GND) pin, pin 3 is the SWD_CLK serial clock pin, and pin 4 is the SWD_DIO serial data pin.

[0052] In one exemplary embodiment of this disclosure, a voltage conversion chip U2 is connected in series between the output terminal V12V of the power supply circuit and the voltage input terminal V5V of the control chip U1. The voltage conversion chip U2 is used to convert the 12V voltage at the output terminal V12V of the power supply circuit to the 5V voltage at the voltage input terminal V5V of the control chip U1. In this exemplary embodiment, the solenoid valve can be used in an automotive environment. The voltage conversion chip U2 can convert the 12V automotive power supply voltage to the 5V voltage required by the VDD pin of the control chip U1, thereby improving the adaptability of the solenoid valve circuit to different power supply voltages.

[0053] According to another aspect of this disclosure, a solenoid valve is also provided, including a valve assembly and a coil assembly; the coil assembly includes an electrically connected coil and a circuit board; the solenoid valve circuit of any of the preceding claims is disposed on the circuit board, and the solenoid valve interface is disposed on the coil. In the solenoid valve provided by this disclosure, the coil can be connected to a power module via the circuit board. The circuit board contains the aforementioned solenoid valve circuit, and the coil voltage of the solenoid valve can be controlled by a pulse width modulation signal output by a control chip U1. This allows for different coil voltages to be provided according to the operating state and actual needs of the solenoid valve, maintaining the coil voltage at the required minimum operating voltage, thereby reducing the temperature rise of the solenoid valve and extending its lifespan. Furthermore, the solenoid valve can be matched with various power supplies, reducing the control required at the user end and thus broadening its application.

[0054] In one exemplary embodiment of this disclosure, the solenoid valve further includes a magnetic guide frame 3 and a protective housing 4; the magnetic guide frame 3 is mounted on the valve assembly, and the coil is located within the coil mounting space formed by the magnetic guide frame 3; the coil and the circuit board are disposed within the protective housing 4, and the protective housing 4 is partially mounted within the coil mounting space and is separately disposed from the magnetic guide frame 3. (See reference...) Figure 7As shown, the magnetic guide frame 3 encloses the coil mounting space, within which the coil is housed. The magnetic guide frame 3 can concentrate the dispersed magnetic field, thereby enhancing the electromagnetic force of the coil and strengthening its ability to control the switching of the solenoid valve. Both the coil and the circuit board are housed within the protective housing 4, which protects both components and improves the operational safety of the solenoid valve. Furthermore, a portion of the protective housing 4 is also installed within the coil mounting space, but it is separate from the magnetic guide frame 3. Compared to a design where the magnetic guide frame 3 is also located inside the protective housing 4, the protective housing 4 and the magnetic guide frame 3 are independent components, allowing for easy separation and assembly.

[0055] Specifically, refer to Figure 8 A schematic diagram of the solenoid valve from another perspective is shown. Figure 9 The diagram shows the installation of the valve assembly and the magnetic guide frame 3. The valve assembly has a limiting surface and a cylindrical surface 101. The magnetic guide frame 3 can be installed on the limiting surface of the valve assembly. The coil is sleeved outside the cylindrical surface 101 and located within the coil installation space. The magnetic guide frame 3 may include a first horizontal plate 31, a first vertical plate 32, and a second horizontal plate 33 connected in sequence, forming a coil installation space. The first horizontal plate 31 and the second horizontal plate 33 are directly opposite each other at the upper and lower ends of the coil, which can enhance the focusing effect on the magnetic field of the coil and improve the electromagnetic force of the coil.

[0056] For example, a coil support may be fitted over the cylindrical surface 101. The coil support has upper and lower ends and a winding portion between the two ends, and the coil is wound on the winding portion of the coil support. For example, the coil may be a winding made of enameled wire. During installation, the coil can be formed by winding the enameled wire around the winding portion of the coil support.

[0057] For example, the second horizontal plate 33 of the magnetic guide frame 3 is disposed on the limiting surface, and the bottom surface of the coil support can be in contact with the surface of the second horizontal plate 33 away from the limiting surface, that is, in contact with the top surface of the second horizontal plate 33; the top surface of the coil support can be in contact with the surface of the first horizontal plate 31 near the limiting surface, that is, in contact with the bottom surface of the first horizontal plate 31.

[0058] In one exemplary embodiment of this disclosure, the protective housing 4 includes a coil protection portion 41 and a circuit board protection portion 42. (See reference...) Figure 7 , Figure 8 The schematic diagram of the solenoid valve shown is as follows: Figure 10 The diagram shows the assembly of the magnetic guide frame 3 and the protective housing 4.

[0059] The coil protection portion 41 at least partially surrounds the coil; the circuit board is disposed within the circuit board protection portion 42; the coil protection portion 41 and the circuit board protection portion 42 are in communication. For example, the circuit board protection portion 42 forms a circuit board receiving space, the circuit board is disposed within the circuit board receiving space, and a protective cover closes the circuit board receiving space. For example, the circuit board receiving space opens towards the top, and the protective cover closes the circuit board receiving space at the top.

[0060] Exemplarily, the circuit board protection section 42 is provided with a potting layer, and the circuit board is encapsulated within the potting layer. The circuit board is fixed to the circuit board protection section 42 by the potting layer. Specifically, after the circuit board is installed in the circuit board receiving space within the circuit board protection section 42, potting compound can be injected into the circuit board receiving space. The potting compound can cure under specific conditions to form a potting layer, which seals and protects the circuit board. Exemplarily, the height of the potting layer is greater than the circuit board, that is, the potting compound covers the circuit board. Exemplarily, the height of the potting layer is lower than the bottom surface of the protective cover. The material of the potting layer may include epoxy resin, polyurethane, or silicone.

[0061] In one exemplary embodiment of this disclosure, reference is made to Figure 8 , Figure 10 As shown, the coil protection part 41 is installed within the coil mounting space and is separately disposed from the valve assembly. Specifically, the bottom surface of the second horizontal plate 33 of the magnetic guide frame 3 is attached to the limiting surface, and the bottom surface of the coil protection part 41 can be attached to the surface of the second horizontal plate 33 away from the limiting surface, that is, to the top surface of the second horizontal plate 33; the top surface of the coil protection part 41 can be attached to the surface of the first horizontal plate 31 near the limiting surface, that is, to the bottom surface of the first horizontal plate 31. In the exemplary embodiment of this disclosure, the coil protection part 41 can be separated from the valve assembly and can be independently disassembled and assembled without affecting each other.

[0062] In one exemplary embodiment of this disclosure, the coil and the circuit board are electrically connected via a first pin, and the circuit board is electrically connected to the power module via a second pin, thereby the circuit board is connected in series between the coil and the power module.

[0063] For example, refer to Figure 7 As shown, the coil protection part 41 and the circuit board protection part 42 are connected through the coil support part 43, thereby allowing the circuit board protection part 42 to be spatially separated from the magnetic guide frame 3. By placing the circuit board inside the circuit board protection part 42 outside the magnetic guide frame 3, such as within the circuit board receiving space, the circuit board can be spatially separated from the magnetic guide frame 3, making the circuit board arrangement more flexible. For example, the first pin can be disposed within the coil support part 43. The coil support part 43 can protect the first pin.

[0064] In one exemplary embodiment of this disclosure, the coil support portion 43 is disposed on the side of the magnetic guide frame 3, with reference to... Figure 7 , Figure 10 As shown. The side of the magnetic guide frame 3 refers to the position adjacent to the first horizontal plate 31 and the second horizontal plate 33 of the magnetic guide frame 3. For example, the coil support part 43 is provided on the side adjacent to the first vertical plate 32 of the magnetic guide frame 3, which is beneficial for the installation of the protective housing 4.

[0065] In one exemplary embodiment of this disclosure, reference is made to Figure 9 , Figure 10 As shown, the first horizontal plate 31 has a clearance portion 34 on one or both sides adjacent to the first vertical plate 32. Part of the coil support portion 43 is located inside the clearance portion 34, which helps to shorten the size of the protective housing 4 in the direction perpendicular to the axis of the valve assembly, making the structure of the protective housing 4 more compact.

[0066] For example, refer to Figures 8 to 10 As shown, the extending direction of the coil support portion 43 is parallel to the extending direction of the cylindrical surface 101. For example, the cylindrical surface 101 extends along the axial direction of the valve assembly, and the coil support portion 43 also extends along the axial direction of the valve assembly. In an exemplary embodiment, refer to... Figure 7 as well as Figure 10 As shown, the circuit board protection part 42 is located on the side of the coil support part 43 away from the limiting surface, and the bottom surface of the circuit board protection part 42 is higher than the top surface of the magnetic guide frame 3. In an exemplary embodiment, by placing the circuit board protection part 42 above the magnetic guide frame 3, the structural design of the protective housing 4 and the arrangement of the circuit board can be more flexible. For example, refer to... Figure 7 , Figure 10 As shown, the portion of the circuit board protection part 42 projected onto the top surface of the magnetic guide frame 3 is located within the outer contour of the top surface of the magnetic guide frame 3. This helps to shorten the size of the protective housing 4 in the direction perpendicular to the axis of the valve assembly, making the structure of the protective housing 4 more compact and the arrangement more flexible.

[0067] In one exemplary embodiment of this disclosure, reference is made to Figure 7 , Figure 8 as well as Figure 10 As shown, the protective housing 4 also includes a wiring section 44. The wiring section 44 is connected to the coil protection section 41 and to the coil support section 43; the extending direction of the wiring section 44 is perpendicular to the extending direction of the cylindrical surface 101. For example, refer to... Figure 7 , Figure 8 as well as Figure 10As shown, the extension direction of the wiring portion 44 is consistent with the direction of the two adjacent surfaces of the first vertical plate 32. At least a portion of the second pin may be disposed on the wiring portion 44, which can protect the second pin. In some exemplary embodiments of this disclosure, the coil protection portion 41 can protect the coil; the circuit board protection portion 42 can protect the circuit board; the coil support portion 43 can connect the coil protection portion 41 and the circuit board protection portion 42 and protect the first pin; the wiring portion 44 can protect the second pin, thereby the protective housing 4 can fully protect the entire coil assembly, preventing damage to the coil, circuit board, first pin, and second pin, water ingress, etc. Exemplarily, the protective housing 4 may include a plastic material.

[0068] The valve assembly of the solenoid valve provided in this disclosure will now be described.

[0069] For example, the valve assembly may include a valve body, a stationary iron core, a moving iron core, and a sleeve, wherein the moving iron core is movably disposed within the sleeve.

[0070] In one exemplary embodiment of this disclosure, a stationary iron core is connected to a valve body, and a sleeve is located on the side of the stationary iron core away from the valve body and connected to the stationary iron core. The stationary iron core and the sleeve form at least a partial cylindrical surface 101. The limiting surface may be located in the valve body, or in the stationary iron core, or the limiting surface may be partially located in the valve body and partially located in the stationary iron core. Specifically, the valve body may include a valve seat and a piston. The valve seat has a receiving cavity and a valve port communicating with the receiving cavity. The piston is received in the receiving cavity to open or close the valve port.

[0071] The valve assembly may further include a valve stem, one end of which engages with the end of the piston furthest from the valve port, and the other end passes through the stationary iron core and the moving iron core, abutting against the first elastic element. The first elastic element is disposed between the top of the sleeve and the valve stem. The valve assembly also includes a second elastic element, disposed between the stationary iron core and the moving iron core. The second elastic element is used to compress when the stationary iron core and the moving iron core approach and attract each other, and to drive the stationary iron core and the moving iron core to separate through elastic force when the attraction between them is released. When the coil is energized and drives the moving iron core to move towards the stationary iron core, the valve stem moves towards the valve port under its own gravity and the elastic force of the first elastic element, driving the piston to move towards the valve port until the piston is in contact with the valve port, thus closing the valve. When the coil is de-energized, the moving iron core and the stationary iron core separate under the elastic force of the second elastic element, and the valve stem moves away from the valve port along with the moving iron core, driving the piston away from the valve port, thus opening the valve.

[0072] Specifically, a pilot valve port is provided at the end of the piston near the valve stem. The valve stem opens and closes the pilot valve port under the drive of the moving iron core. A pilot hole axially penetrates the piston at its center and is connected to the pilot valve port. By providing the pilot valve port and pilot hole, a pressure difference force exists on both sides of the piston when it opens or closes the valve. This pressure difference force pushes the piston, reducing the difficulty of opening or closing the valve.

[0073] For example, when the coil is not energized, the moving iron core and the stationary iron core separate under the elastic force of the second elastic element, and the valve stem opens the pilot valve port. At this time, the chamber on the side of the piston closest to the valve stem is depressurized through the pilot valve port and the pilot orifice, forming a liquid pressure difference between the two ends of the piston and maintaining balance. Under the action of the pressure difference, the piston moves upward away from the valve port, thus opening the valve port. When the coil is energized, the moving iron core overcomes the elastic force of the second elastic element and moves towards the stationary iron core. The valve stem resets under its own gravity and the elastic force of the first elastic element, thereby closing the pilot valve port. The piston moves downward, closing the valve port.

[0074] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility models disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. A solenoid valve circuit, characterized in that, It includes a power supply circuit, a control circuit, and a drive circuit; the power supply circuit is connected in series between the power module and the first input terminal of the drive circuit, so that the power module supplies power to the drive circuit through the power supply circuit; the output terminal of the drive circuit is connected to the solenoid valve interface to provide coil voltage to the solenoid valve. The control circuit includes a control chip. The output terminal of the power supply circuit is connected to the voltage detection terminal and the voltage input terminal of the control chip. The control terminal of the control chip is connected to the second input terminal of the drive circuit to output a pulse width modulation signal to the drive circuit. The driving circuit adjusts the coil voltage input to the solenoid valve according to the voltage at the first input terminal and the pulse width modulation signal at the second input terminal.

2. The solenoid valve circuit according to claim 1, characterized in that, The power supply circuit includes a first diode and a second diode. The input terminal of the first diode is connected to the power module, and the output terminal of the first diode is connected to the output terminal of the power supply circuit. The input terminal of the second diode is grounded, and the output terminal of the second diode is connected to the power module.

3. The solenoid valve circuit according to claim 2, characterized in that, The power module and the output terminal of the power supply circuit are connected in series with a first inductor and a first diode; at least one capacitor is provided between the anode of the first diode and the ground terminal of the power supply circuit; at least one capacitor is provided between the cathode of the first diode and the ground terminal of the power supply circuit.

4. The solenoid valve circuit according to claim 1, characterized in that, The solenoid valve interface includes a first solenoid valve interface and a second solenoid valve interface. The first solenoid valve interface is connected to the first input terminal, and the second solenoid valve interface is grounded. The drive circuit includes a first switch and a second switch. The first switch is located between the first input terminal and the first solenoid valve interface, and the second switch is located between the first input terminal and the ground terminal of the drive circuit.

5. The solenoid valve circuit according to claim 4, characterized in that, The source of the first switching transistor is connected to the first input terminal, and the drain of the first switching transistor is connected to the first solenoid valve interface through a second inductor; the collector of the second switching transistor is connected to the first input terminal through a first resistor and a second resistor connected in parallel, and the emitter of the second switching transistor is connected to the ground terminal of the driving circuit; the gate of the first switching transistor is connected to the emitter of the second switching transistor, and the base of the second switching transistor is connected to the second input terminal through a third resistor, and the base of the second switching transistor is also connected to the ground terminal of the driving circuit through a fourth resistor.

6. The solenoid valve circuit according to claim 4, characterized in that, A sixth resistor and an eighth resistor are connected in series between the first solenoid valve interface and the second solenoid valve interface. The voltage between the sixth resistor and the eighth resistor is connected to the voltage feedback terminal of the control chip. The control chip is used to control the pulse width modulation signal according to the voltage of the voltage feedback terminal.

7. The solenoid valve circuit according to claim 1, characterized in that, The output terminal of the power supply circuit is connected to the voltage detection terminal of the control chip through a fifth resistor. When the voltage at the voltage detection terminal of the control chip is greater than or equal to 9V, the control chip outputs a first pulse width modulation signal to the drive circuit through its control terminal.

8. The solenoid valve circuit according to claim 7, characterized in that, The control chip is used to output a second pulse width modulation signal to the driving circuit through the control terminal of the control chip when the first pulse width modulation signal is output for a first preset time. The duty cycle of the second pulse width modulation signal is less than the duty cycle of the first pulse width modulation signal.

9. The solenoid valve circuit according to claim 1, characterized in that, A voltage conversion chip is connected in series between the output terminal of the power supply circuit and the voltage input terminal of the control chip. The voltage conversion chip is used to convert the 12V voltage at the output terminal of the power supply circuit into the 5V voltage at the voltage input terminal of the control chip.

10. A solenoid valve, characterized in that, include: A valve assembly and a coil assembly; the coil assembly includes an electrically connected coil and a circuit board; the solenoid valve circuit of any one of claims 1 to 9 is disposed on the circuit board, and the solenoid valve interface is disposed on the coil.

11. The solenoid valve according to claim 10, characterized in that, The solenoid valve also includes a magnetic guide frame (3) and a protective housing (4); the magnetic guide frame (3) is installed on the valve assembly, and the coil is located in the coil mounting space formed by the magnetic guide frame (3); the coil and the circuit board are located in the protective housing (4), and the protective housing (4) is partially installed in the coil mounting space and is separately set from the magnetic guide frame (3).

Images