Electromagnetic valve current control circuit, electromagnetic valve controller and pneumatic comfort system

Abstract

The utility model relates to the technical field of pneumatic comfort systems, in particular to an electromagnetic valve current control circuit, an electromagnetic valve controller and a pneumatic comfort system. According to the electromagnetic valve current control circuit, the voltage configuration adjusting module with the voltage bias circuit is arranged and connected with the step-down driving module in a conducting mode, and therefore accurate adjusting control over the working current of the electromagnetic valve is achieved. And when a plurality of voltage bias circuits are provided, the output voltage of the driving output end can be richer through the combination of the conduction relations of the plurality of voltage bias circuits.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve control circuit technology, and in particular to electromagnetic valve current control circuit, electromagnetic valve controller and pneumatic comfort system. Background Technology

[0002] Solenoid valves are electromagnetically controlled industrial devices, fundamental components of automation systems used to control fluids. They are actuators, not limited to hydraulic or pneumatic systems. Used in industrial control systems to adjust the direction, flow rate, speed, and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, ensuring both precision and flexibility.

[0003] Currently, most low-pressure solenoid valves on the market directly use high and low voltage levels for control, resulting in uncontrollable noise levels and high energy consumption. Noise reduction for solenoid valves typically involves adding sound-absorbing cotton to the outside, but this can increase the valve's size. Utility Model Content

[0004] To address the aforementioned issues, this invention proposes a solenoid valve current control circuit, a solenoid valve controller, and a pneumatic comfort system, which solves the problems of uncontrollable noise levels and high energy consumption associated with the direct use of high and low voltage levels for control in existing technologies.

[0005] In a first aspect, this utility model provides a current control circuit for an electromagnetic valve, comprising:

[0006] A step-down drive module for connecting to a solenoid valve drive;

[0007] A voltage configuration adjustment module is connected to the buck drive module and feeds back the voltage configuration to the buck drive module, including at least one voltage bias circuit;

[0008] The system also includes a control module connected to the buck drive module and the voltage configuration adjustment module. This module controls the voltage configuration adjustment module to perform voltage configuration adjustment and controls the buck drive circuit to output voltage based on the voltage configuration feedback from the voltage configuration adjustment module.

[0009] In some embodiments, the buck drive module includes a buck chip, a first inductor, a bootstrap capacitor, and a voltage divider resistor. The voltage configuration adjustment module is connected to the buck chip and feeds back the voltage configuration to the buck chip. The buck chip is further provided with a power supply terminal, a switch drive terminal, and a start terminal. The power supply terminal is used to connect to an external power source for power. The first end of the first inductor is connected to the second end of the bootstrap capacitor and the switch drive terminal. The second end of the first inductor is used to connect to a solenoid valve drive. The first end of the bootstrap capacitor is connected to the start terminal through the voltage divider resistor.

[0010] In some embodiments, a filtering module is further included, which includes an input filtering circuit and an output filtering circuit. The step-down drive module is provided with a power supply terminal for connecting to an external power source and a switch drive terminal for controlling the on / off connection with the solenoid valve. The input filtering circuit is connected to the power supply terminal, and the output filtering circuit is connected to the switch drive terminal.

[0011] In some embodiments, the system further includes a first voltage modulation circuit, which includes a first pull-up resistor and a third capacitor. The buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive. The first end of the first pull-up resistor and the first end of the third capacitor are connected to the feedback adjustment terminal of the buck drive module, and the second end of the first pull-up resistor and the second end of the third capacitor are connected to the drive output terminal.

[0012] In some embodiments, a second voltage modulation circuit is further included, the second voltage modulation circuit including a first pull-down resistor, a second pull-down resistor and a third pull-down resistor; the buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive, the first ends of the first pull-down resistor, the second pull-down resistor and the third pull-down resistor are connected to the feedback adjustment terminal of the buck drive module, and the second ends of the first pull-down resistor, the second pull-down resistor and the third pull-down resistor are grounded.

[0013] In some embodiments, there are multiple voltage biasing circuits, and the multiple voltage biasing circuits are connected in parallel.

[0014] In some embodiments, the voltage biasing circuit includes a transistor, a first biasing resistor, a second biasing resistor, and a third biasing resistor;

[0015] The step-down drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive. The base of the transistor is connected to the first bias resistor and the second bias resistor, the collector is connected to the feedback adjustment terminal through the third bias resistor, and the emitter is grounded. The other end of the first bias resistor is connected to the control module, and the other end of the second bias resistor is grounded.

[0016] In some embodiments, the control module includes a control chip, the control chip includes an enable output terminal and at least one adjustment output terminal, the enable output terminal is connected to the buck drive module for enabling, and the adjustment output terminal is connected to the voltage bias circuit of the voltage configuration adjustment module and outputs an adjustment signal to the voltage bias circuit.

[0017] Secondly, this utility model provides a solenoid valve controller, including a circuit board, wherein the circuit board integrates the solenoid valve current control circuit as described above.

[0018] Thirdly, this utility model provides a pneumatic comfort system, including an air bag, a solenoid valve, a solenoid valve controller as described above, and an air supply device. The air supply device is connected to the air bag for air supply through the solenoid valve, and the solenoid valve controller controls the solenoid valve to operate.

[0019] The electromagnetic valve current control circuit, electromagnetic valve controller, and pneumatic comfort system of this utility model achieve the following effects:

[0020] The solenoid valve current control circuit of this utility model is equipped with a voltage configuration adjustment module with a voltage bias circuit. By connecting it to the step-down drive module, the output voltage of the step-down drive module is adjusted, thereby realizing precise adjustment and control of the solenoid valve operating current.

[0021] Furthermore, multiple voltage bias circuits can be configured in parallel. When there are multiple voltage bias circuits, the output voltage at the drive output terminal can be enriched by combining the conduction relationships of multiple voltage bias circuits.

[0022] This invention's solenoid valve current control circuit not only allows the control module to output commands to control different adjustment output terminals to regulate the conduction relationship of the voltage bias circuit, but also causes the output voltage at the drive output terminal to exhibit a step-like change when the solenoid valve voltage changes. This reduces the movement speed of the solenoid valve core, lessens the impact between the core and the solenoid valve, and reduces noise generation. Furthermore, this invention can adjust the current of the solenoid valve in different operating states by setting the conduction relationship of the voltage bias circuit, such as enabling the solenoid valve to start at high pressure and maintain at low pressure, thus reducing energy consumption when the solenoid valve is opened.

[0023] The above description is merely an overview of the technical solutions of the present utility model embodiments. In order to better understand the technical means of the present utility model embodiments and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present utility model embodiments more obvious and understandable, specific embodiments of the present utility model are described below. Attached Figure Description

[0024] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 This is a schematic diagram of the electromagnetic valve current control circuit according to an embodiment of the present invention;

[0026] Figure 2 This is a circuit diagram of the electromagnetic valve current control circuit according to an embodiment of the present invention;

[0027] Figure 3This is a schematic diagram of the structure of the solenoid valve controller according to an embodiment of the present utility model;

[0028] Figure 4 This is a voltage step curve diagram of an embodiment of the present invention;

[0029] Figure 5 This is a current step curve diagram of an embodiment of the present invention.

[0030] Figure label:

[0031] 110. Buck driver module; 120. Voltage configuration adjustment module; 130. Control module; 140. First voltage modulation circuit; 150. Second voltage modulation circuit; 160. Filtering module; 121. Voltage bias circuit; U1. Control chip; U2. Buck chip; R1. First bias resistor; R2. Second bias resistor; R3. Third bias resistor; R4. First pull-up resistor; R5. First pull-down resistor; R6. Second pull-down resistor; R7. Third pull-down resistor; R8. Voltage divider resistor; L1. First inductor; C1. First capacitor; C2. Second capacitor; C3. Third capacitor; C4. Bootstrap capacitor; Q1. Transistor; 300. Solenoid valve controller; 310. Solenoid valve current control circuit. Detailed Implementation

[0032] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of this utility model can be combined with each other. The detailed description in the specific embodiments should be understood as an explanation of the spirit of this utility model and should not be regarded as an improper limitation of this utility model.

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the specific technical solutions of this utility model will be further described in detail below with reference to the accompanying drawings of the embodiments of this utility model. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0034] In the embodiments of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] Furthermore, in this embodiment of the invention, directional terms such as "upper," "lower," "left," and "right" are defined relative to the positions of the components shown in the accompanying drawings. It should be understood that these directional terms are relative concepts, used for relative description and clarification, and can change accordingly depending on the position of the components in the accompanying drawings.

[0036] In the embodiments of this utility model, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0037] In embodiments of this invention, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0038] In this embodiment of the invention, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design described as "exemplary" or "for example" in this embodiment of the invention should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0039] Figure 1-2 This illustration shows an embodiment of a solenoid valve current control circuit, applied in a solenoid valve controller, to drive the valve core of the solenoid valve through an output voltage, thereby opening or closing the solenoid valve. The circuit includes a step-down drive module 110, a voltage configuration adjustment module 120, and a control module 130.

[0040] The step-down drive module 110 is used to connect with the solenoid valve drive. For example, the step-down drive module can be connected to the solenoid valve drive by setting the drive output terminal VOUT and the feedback adjustment terminal FB; the step-down drive module 110 can adjust the voltage according to the connection resistance of the feedback adjustment terminal, and output voltage to the outside through the drive output terminal to make the solenoid valve work.

[0041] The voltage configuration adjustment module 120 is connected to the buck drive module and feeds back the voltage configuration to the buck drive module, including at least one voltage bias circuit 121; the voltage bias circuit 121 can be connected to or disconnected from the buck drive module; when there is one voltage bias circuit 121, it can achieve two states: one voltage bias circuit 121 is on or off; when there are multiple voltage bias circuits 121, it can achieve multiple voltage bias circuits on or off configurations, thereby realizing various voltage transformations.

[0042] The control module 130 is connected to the buck drive module 110 and the voltage configuration adjustment module 120, and is used to control the voltage configuration adjustment module to perform voltage configuration adjustment, and to control the buck drive circuit to output voltage according to the voltage configuration feedback from the voltage configuration adjustment module. For example, the control module 130 is enabled connected to the buck drive module 110 to control whether the buck drive module 110 is working. The control module 130 can also output an adjustment signal to the voltage configuration adjustment module 120, and use the adjustment signal to turn the voltage bias circuit 121 on or off with the buck drive module 110, so as to adjust the output voltage of the drive output terminal.

[0043] In the above scheme, the solenoid valve current control circuit of this utility model is equipped with a voltage configuration adjustment module 120 having one or more voltage bias circuits 121. This module is connected to a buck drive module 110 to adjust the output voltage of the buck drive module 110. The conduction state of the voltage bias circuit 121 is controlled by a control module 130. When there are multiple voltage bias circuits 121, the number of adjustment output terminals (MSV1~MSV5) of the control module 130 is equal to the number of voltage bias circuits 121, and the output signals of each adjustment output terminal are independent, so that the voltage bias circuits 121 can achieve different conduction configurations.

[0044] The solenoid valve current control circuit of this invention enables the control module 130 to output commands to control different adjustment output terminals, thereby controlling the conduction relationship of the voltage bias circuit 121. When the solenoid valve voltage changes, the output voltage of the drive output terminal changes in a step-like manner, thereby reducing the movement speed of the solenoid valve core, reducing the impact between the core and the solenoid valve, and reducing the generation of noise.

[0045] In some embodiments, the buck drive module 110 includes a buck chip U2, a first inductor L1, a bootstrap capacitor C4, and a voltage divider resistor R8. A feedback adjustment terminal FB is located on the buck chip U2. A voltage configuration adjustment module is connected to the buck chip and feeds back the voltage configuration to the buck chip. The buck chip U2 also has a power supply terminal VIN, a switch drive terminal SW, and a startup terminal BOOT. The power supply terminal VIN is used to connect to an external power source for power. The first end of the first inductor L1 is connected to the second end of the bootstrap capacitor C4 and the switch drive terminal SW. The second end of the first inductor L1 is the drive output terminal VOUT, used to connect to the solenoid valve drive. The first end of the bootstrap capacitor C4 is connected to the startup terminal through the voltage divider resistor R8. In this embodiment, the external power source can be a 12V input power source. The buck chip U2 is enabled and controlled by the control module 130. For example, when the control module 130 outputs a high level to the buck chip U2, the buck chip U2 outputs voltage through the switch drive terminal. The connection between the feedback adjustment terminal FB of the step-down chip U2 and the voltage bias circuit 121 can be used to adjust the output voltage of the switch drive terminal SW. The more resistors connected in parallel at the feedback adjustment terminal, the larger the output voltage of the switch drive terminal. The first inductor L1 and the bootstrap capacitor C4 are used for energy storage, voltage reduction, and circuit stabilization.

[0046] In some embodiments, a filtering module 160 is also included. The filtering module 160 includes an input filtering circuit and an output filtering circuit. The step-down drive module is provided with a power supply terminal for connecting to an external power source and a switch drive terminal for controlling the on / off connection with the solenoid valve. The input filtering circuit is connected to the power supply terminal, and the output filtering circuit is connected to the switch drive terminal.

[0047] In this embodiment, the input filter circuit filters out noise and stabilizes the voltage of the input power supply to ensure the normal operation of the buck chip in the buck driver module. The input filter circuit can include at least one first capacitor C1, wherein the first terminal of the first capacitor C1 is connected to the power supply terminal VIN of the buck driver module, and the second terminal of the first capacitor C1 is grounded. Figure 2 In the specific example shown, the first capacitor C1 consists of three different types of capacitors to filter noise of different frequencies.

[0048] The output filter circuit filters out noise and stabilizes the voltage of the drive signal output from the switching drive terminal of the buck driver module, ensuring stable operation of the solenoid valve. The output filter circuit can include at least one second capacitor C2, where the first terminal of the second capacitor C2 is connected to the switching drive terminal VOUT of the buck driver module, and the second terminal of the second capacitor C2 is grounded. Figure 2 In the specific example shown, the second capacitor C2 consists of four different types of capacitors to filter noise of different frequencies.

[0049] In some embodiments, the system further includes a first voltage modulation circuit 140 and a second voltage modulation circuit 150. The first voltage modulation circuit 140 includes a first pull-up resistor R4 and a third capacitor C3. The buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive. The first end of the first pull-up resistor and the first end of the third capacitor are connected to the feedback adjustment terminal of the buck drive module, and the second end of the first pull-up resistor R4 and the second end of the third capacitor C3 are connected to the drive output terminal of the buck drive module. The first voltage modulation circuit 140 is used to maintain the voltage stability of the feedback adjustment terminal by pulling up the resistor.

[0050] The second voltage modulation circuit 150 includes a first pull-down resistor R5, a second pull-down resistor R6, and a third pull-down resistor. The buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive. The first terminals of the first, second, and third pull-down resistors are connected to the feedback adjustment terminal of the buck drive module, and the second terminals of the first, second, and third pull-down resistors R5, R6, and R7 are grounded. In this embodiment, the voltage at the feedback adjustment terminal can be modulated by the first voltage modulation circuit 140 and / or the second voltage modulation circuit 150 to provide a base voltage. In a specific example, the first pull-up resistor R4, the second pull-up resistor, the first pull-down resistor R5, the second pull-down resistor R6, and the third pull-down resistor are all connected to the feedback adjustment terminal. The three pull-down resistors provide multiple adjustable resistance values ​​for the feedback adjustment terminal, facilitating multi-level adjustment.

[0051] In some embodiments, the voltage bias circuit 121 includes a transistor Q1, a first bias resistor R1, a second bias resistor R2, and a third bias resistor R3. The buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive. The base of transistor Q1 is connected to the first ends of the first bias resistor R1 and the second bias resistor R2, the collector is connected to the feedback adjustment terminal FB of the buck drive module through the third bias resistor R3, and the emitter is grounded. The second end of the first bias resistor R1 is connected to the control module 130, and the other end of the second bias resistor R2 is grounded. In this embodiment, the base of the transistor receives the adjustment signal output from the adjustment output terminal of the control module 130, which controls the third bias resistor R3 to conduct; that is, when the adjustment signal at the base of transistor Q1 is a high-level signal, transistor Q1 conducts, and the third bias resistor R3 is connected to the feedback adjustment terminal of the buck drive module to adjust the voltage at the feedback adjustment terminal. The first bias resistor R1 and the second bias resistor R2 are used to provide the operating voltage for transistor Q1.

[0052] In some embodiments, the control module 130 includes a control chip U1, which includes an enable output terminal U1_1 and at least one adjustment output terminal MSV1~MSV5. The enable output terminal is connected to enable the buck driver module 110, and the adjustment output terminals MSV1~MSV5 are connected to the voltage bias circuit 121 and output adjustment signals to the voltage bias circuit 121. In this embodiment, the control chip U1 is responsible for closed-loop control signal processing. The enable output terminal outputs high and low levels, and the buck driver module 110 can be activated by outputting a high level. The number of adjustment output terminals corresponds to the number of voltage bias circuits 121. By adjusting the output terminals to control the on / off state of the voltage bias circuits 121, different configurations can be achieved, outputting different voltages, realizing precise control, and reducing noise.

[0053] In some embodiments, there are multiple voltage biasing circuits, and the multiple voltage biasing circuits are connected in parallel. In a preferred embodiment, the resistance value of the third biasing resistor of each voltage biasing circuit is set independently. The resistance values ​​of the third biasing resistors of the multiple voltage biasing circuits may be the same or different, including at least two voltage biasing circuits having the same resistance value of the third biasing resistor, or at least two voltage biasing circuits having different resistance values ​​of the third biasing resistor.

[0054] In such Figure 2 In the specific example shown, there are five voltage bias circuits 121, and the buck drive module 110 forms 32 sets of output voltages through the conduction relationship with the five voltage bias circuits 121. In this embodiment, the control module 130 is provided with five adjustment output terminals, and the five adjustment output terminals are respectively connected to the five voltage bias circuits 121 and output adjustment signals. By adjusting the conduction relationship and the number of voltage bias circuits 121, the resistance value of the connection resistor of the feedback adjustment terminal can be adjusted, thereby adjusting the output voltage of the buck drive module 110.

[0055] Figure 3 An embodiment of the solenoid valve controller 300 of the present invention is shown, including a circuit board, on which a solenoid valve current control module 310 as described above is integrated; the solenoid valve controller controls the valve core to move through the solenoid valve current control module.

[0056] Specifically, the solenoid valve controller 300 includes a buck drive module, a voltage configuration adjustment module, and a control module. The buck drive module outputs a voltage ranging from 4.2V to 12.4V in 32 levels. The control module uses five adjustable output terminals to control five voltage bias circuits, resulting in 32 possible conduction configurations, i.e., 32 possible pull-down resistor values. By changing different pull-down resistors, 32 different stepped output voltages are obtained. In this embodiment, V... (OUT) = (R) 上拉 +R 下拉 ) / R 下拉, where V (OUT) For the output voltage, R 上拉 R is the total resistance of the pull-up resistors. 下拉 This represents the total resistance of the pull-down resistors.

[0057] The third bias resistor values ​​for the five voltage bias circuits are 10KΩ, 12KΩ, 15KΩ, 20KΩ, and 24KΩ, respectively. The total pull-up resistor value is 24KΩ, and the total pull-down resistor value is 7.5KΩ. The buck driver module has 32 conduction configurations and 32 output voltages, as shown in Table 1 below:

[0058]

[0059] Table 1

[0060] Where BCD is the conduction configuration number, MSV1~MSV5 are 5 adjustable output terminals, and the state of the adjustable output terminals is either L low level or H high level; R MSV1 ~R MSV5 These are the resistance values ​​of the third bias resistors for the five voltage bias circuits, in kΩ.

[0061] See also Figure 4-5 During the opening process of the solenoid valve, the output voltage of the control input solenoid valve coil increases in steps, and the output current from the step-down drive module to the solenoid valve coil increases linearly. When the opening voltage V is reached... S When the valve core loosens, the solenoid valve opens; and the voltage is continuously increased in steps until the maximum voltage V is reached. H To ensure the valve core has fully moved to the other end, ensure the solenoid valve is fully open. After the solenoid valve is fully open, readjust the voltage to the holding voltage V. D The holding voltage V D Greater than the turn-on voltage V S This is to keep the solenoid valve in the open state and reduce energy consumption when maintaining the open state. Similarly, as Figure 5 As shown, the output current and output voltage of the buck driver module are output accordingly.

[0062] During the opening process of the solenoid valve, the voltage is controlled to increase in stages, causing the current applied to the coil to rise linearly. This gradually increases the excitation force applied to the valve core until the valve core loosens. The voltage is then controlled to continue increasing in stages, causing the valve core to gradually accelerate to the other end of the solenoid valve until the maximum voltage V is reached. H This ensures the solenoid valve is fully open. This is in contrast to the traditional method of directly applying a high level to the coil, i.e., directly outputting the maximum voltage V. HThis causes the valve core to be directly subjected to the maximum excitation force, accelerating it to a higher speed and causing a violent impact when it reaches the other side. The control voltage is increased in stages, resulting in a lower acceleration speed for the valve core to reach the other side, producing a smaller impact and reducing noise. Furthermore, after the solenoid valve is fully open, the voltage is reduced to the holding voltage V. D Compared to traditional solenoid valves where the voltage remains high after opening, this reduces the energy consumption when the solenoid valve is opened.

[0063] In some embodiments, the present invention provides a pneumatic comfort system, including an air bag, a solenoid valve, a solenoid valve controller as described above, and an air supply device. The air supply device is connected to the air bag for air supply through the solenoid valve, and the solenoid valve controller controls the solenoid valve to operate.

[0064] In the embodiment of the pneumatic comfort system of this utility model, the air bag can be one or more of a massage air bag, a lumbar support air bag, and a side support air bag, and the corresponding pneumatic comfort system can be one or more of a pneumatic massage system, a pneumatic lumbar support system, and a pneumatic side support system. The solenoid valve can be selected as a two-position three-way solenoid valve, which can be connected to the corresponding massage air bag for inflation and deflation control; the solenoid valve can also be selected as a three-position three-way solenoid valve, which can be connected to the corresponding lumbar support air bag and side support air bag for inflation, deflation, and pressure maintenance control. The air supply device can be, but is not limited to, an air pump, an air tank, or an air compressor. Furthermore, the air supply device can also be an integrated pump-valve structure with the solenoid valve.

[0065] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. Similarly, for the sake of brevity and to aid in understanding one or more aspects of the invention, in the above description of exemplary embodiments of the invention, various features of the embodiments of the invention are sometimes grouped together in a single embodiment, figure, or description thereof. The claims, which follow the detailed description, are hereby expressly incorporated into that detailed description, wherein each claim itself constitutes a separate embodiment of the invention.

[0066] Those skilled in the art will understand that the modules in the device of the embodiment can be adaptively changed and placed in one or more devices different from that embodiment. Modules, units, or components in the embodiment can be combined into a single module, unit, or component, and further, they can be divided into multiple sub-modules, sub-units, or sub-components, except that at least some of such features and / or processes or units are mutually exclusive.

[0067] The sequence numbers of the above-mentioned embodiments of this utility model are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are only preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent device or equivalent process transformation made based on the content of this utility model specification and drawings, or direct or indirect application in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A current control circuit for a solenoid valve, characterized in that, include: A step-down drive module for connecting to a solenoid valve drive; A voltage configuration adjustment module is connected to the buck drive module and feeds back the voltage configuration to the buck drive module. The voltage configuration adjustment module includes at least one voltage bias circuit. The system also includes a control module connected to the buck drive module and the voltage configuration module. This module controls the voltage configuration adjustment module to perform voltage configuration adjustment and controls the buck drive circuit to output voltage based on the voltage configuration feedback from the voltage configuration adjustment module.

2. The solenoid valve current control circuit according to claim 1, characterized in that, The buck drive module includes a buck chip, a first inductor, a bootstrap capacitor, and a voltage divider resistor. The voltage configuration adjustment module is connected to the buck chip and feeds back the voltage configuration to the buck chip. The buck chip is also provided with a power supply terminal, a switch drive terminal, and a start terminal. The power supply terminal is used to connect to an external power source for power. The first end of the first inductor is connected to the second end of the bootstrap capacitor and the switch drive terminal. The second end of the first inductor is used to connect to a solenoid valve drive. The first end of the bootstrap capacitor is connected to the start terminal through the voltage divider resistor.

3. The solenoid valve current control circuit according to claim 1, characterized in that, It also includes a filtering module, which includes an input filtering circuit and an output filtering circuit. The step-down drive module is provided with a power supply terminal for connecting to an external power source and a switch drive terminal for controlling the on / off connection with the solenoid valve. The input filtering circuit is connected to the power supply terminal, and the output filtering circuit is connected to the switch drive terminal.

4. The solenoid valve current control circuit according to claim 1, characterized in that, It also includes a first voltage modulation circuit, which includes a first pull-up resistor and a third capacitor; the buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive, the first end of the first pull-up resistor and the first end of the third capacitor are connected to the feedback adjustment terminal of the buck drive module, and the second end of the first pull-up resistor and the second end of the third capacitor are connected to the drive output terminal of the buck drive module.

5. The solenoid valve current control circuit according to claim 1, characterized in that, It also includes a second voltage modulation circuit, which includes a first pull-down resistor, a second pull-down resistor, and a third pull-down resistor; the buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive, the first ends of the first pull-down resistor, the second pull-down resistor, and the third pull-down resistor are connected to the feedback adjustment terminal of the buck drive module, and the second ends of the first pull-down resistor, the second pull-down resistor, and the third pull-down resistor are grounded.

6. The solenoid valve current control circuit according to claim 1, characterized in that, There are multiple voltage bias circuits, and the multiple voltage bias circuits are connected in parallel.

7. The solenoid valve current control circuit according to claim 1, characterized in that, The voltage biasing circuit includes a transistor, a first biasing resistor, a second biasing resistor, and a third biasing resistor; The buck drive module is provided with a feedback adjustment terminal for connection to the voltage configuration adjustment module and a drive output terminal for connection to the solenoid valve drive. The base of the transistor is connected to the first end of the first bias resistor and the second bias resistor, the collector is connected to the feedback adjustment terminal of the buck drive module through the third bias resistor, and the emitter is grounded. The second end of the first bias resistor is connected to the control module, and the second end of the second bias resistor is grounded.

8. The solenoid valve current control circuit according to claim 1, characterized in that, The control circuit includes a control chip, which includes an enable output terminal and at least one adjustment output terminal. The enable output terminal is connected to the buck drive module for enabling, and the adjustment output terminal is connected to the voltage bias circuit of the voltage configuration adjustment module and outputs an adjustment signal to the voltage bias circuit.

9. A solenoid valve controller, characterized in that, The device includes a circuit board that integrates a solenoid valve current control circuit as described in any one of claims 1-8.

10. A pneumatic comfort system, characterized in that, It includes an air bag, a solenoid valve, a solenoid valve controller as described in claim 9, and an air supply device, wherein the air supply device is connected to the air bag for air supply through the solenoid valve, and the solenoid valve controller controls the solenoid valve to operate.

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