Electromagnetic valve control circuit and device and pneumatic comfort system

Abstract

The utility model provides an electromagnetic valve control circuit, an electromagnetic valve control device and a pneumatic comfort system. The electromagnetic valve control circuit comprises an anti-phase module, a push-pull module, an adjusting module, a sampling module and a control module, the anti-phase module is used for being switched on when the received PWM signal is at a first level, or is used for being switched off when the received PWM signal is at a second level; the push-pull module is used for outputting a first control signal when the anti-phase module is switched on or outputting a second control signal when the anti-phase module is switched off; the adjusting module is used for being switched on when the first control signal is received, or is used for being switched off when the second control signal is received; the sampling module is used for collecting a voltage signal or a current signal when the adjusting module is conducted; the control module is used for outputting PWM signals and adjusting the duty ratio of the output PWM signals according to the voltage signals or the current signals collected by the sampling module. According to the utility model, the working quietness and stability of the electromagnetic valve can be improved.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuit technology, and in particular to a solenoid valve control circuit, device, and pneumatic comfort system. Background Technology

[0002] Most solenoid valves on the market today use high and low voltage levels to control opening and closing. When a traditional solenoid valve is working, the maximum current is applied directly to the coil of the solenoid valve, causing the valve core (iron core) to loosen and move rapidly. The valve core does not decelerate at all during this displacement switching process, causing it to strike the valve body opening at high speed, generating noticeable noise.

[0003] The impact noise of solenoid valves during operation, especially the frequent impact noise during frequent switching, becomes more prominent in pneumatic comfort systems where a quiet experience is required, severely limiting the application of solenoid valves in pneumatic comfort systems. Utility Model Content

[0004] To address the aforementioned technical problems, this utility model provides a solenoid valve control circuit, device, and pneumatic comfort system, which can improve the quietness and stability of solenoid valve operation.

[0005] In a first aspect, this utility model provides a solenoid valve control circuit, comprising: an inverting module, a push-pull module, an adjustment module, a sampling module, and a control module; the inverting module is connected to the control module via a PWM control interface, and is also connected to the push-pull module, the push-pull module, the adjustment module, and the sampling module; the sampling module is also connected to the control module; the inverting module is used to turn on when the received PWM signal is at a first level, or to turn off when the received PWM signal is at a second level; the push-pull module is used to output a first control signal when the inverting module is on, or to output a second control signal when the inverting module is off; the adjustment module is used to turn on when the first control signal is received, or to turn off when the second control signal is received; the sampling module is used to acquire a voltage signal or a current signal when the adjustment module is on; the control module is used to output a PWM signal and adjust the duty cycle of the output PWM signal according to the voltage signal or current signal acquired from the sampling module.

[0006] In some embodiments, the inverting module includes a switch Q4, resistors R9, R11, R12, and R13; the first end of resistor R13 is connected to the control module through the PWM control interface, the second end of resistor R13 is connected to the control terminal of switch Q4 and the first end of resistor R12, the second end of switch Q4 is connected to the second end of resistor R12 and grounded during operation, the first end of switch Q4 is connected to the power supply through resistor R9 during operation, and the first end of switch Q4 is also connected to the push-pull module through resistor R11.

[0007] In some embodiments, the push-pull module includes a switch Q2, a switch Q3, a resistor R8, and a resistor R10; the control terminals of the switch Q2 and the switch Q3 are both connected to the inverting module; the first terminal of the switch Q2 is connected to the power supply during operation; the second terminal of the switch Q2 is connected to the first terminal of the switch Q3; the second terminal of the switch Q3 is grounded during operation; the second terminal of the switch Q2 is also connected to the first terminal of the resistor R10; the second terminal of the resistor R10 is connected to the power supply through the resistor R8 during operation; and the second terminal of the resistor R10 is also connected to the adjustment module.

[0008] In some embodiments, the adjustment module includes a switching transistor Q1, a Zener diode D1, and a Zener diode D2; the control terminal of the switching transistor Q1 is connected to the push-pull module; the first terminal of the switching transistor Q1 is connected to the power supply via the negative terminal of the Zener diode D1 during operation; the positive terminal of the Zener diode D1 is connected to the positive terminal of the Zener diode D2; the negative terminal of the Zener diode D2 is connected to the control terminal of the switching transistor Q1; and the second terminal of the switching transistor Q1 is connected to the sampling module.

[0009] In some embodiments, the sampling module includes a first voltage acquisition circuit and a second voltage acquisition circuit, respectively used to acquire a first voltage signal and a second voltage signal when the adjustment module is turned on; the first voltage acquisition circuit includes resistors R1, R2, R3, and capacitor C2, and the second voltage acquisition circuit includes resistors R5, R6, R7, and capacitor C3; and the sampling module further includes resistor R4; the first end of resistor R4 is connected to the first end of resistor R5 and the adjustment module, the second end of resistor R4 is connected to the first end of resistor R2 and the solenoid valve, the second end of resistor R5 is connected to the first ends of resistors R6 and R7, the second end of resistor R7 is connected to the first end of capacitor C3 and the control module, the second end of resistor R6 is connected to the second end of capacitor C3 and is grounded during operation, the second end of resistor R2 is connected to the first ends of resistors R1 and R3, the second end of resistor R1 is connected to the first end of capacitor C2 and the control module, and the second end of resistor R3 is connected to the second end of capacitor C2 and is grounded during operation.

[0010] In some embodiments, the control module includes a controller U1; the first pin of the controller U1 is connected to the inverting module, the seventh pin of the controller U1 is connected to the sampling module, the fifth pin of the controller U1 is connected to the sampling module, the eighth pin of the controller U1 is connected to the power supply during operation, and the fourth pin of the controller U1 is grounded during operation.

[0011] In some embodiments, the solenoid valve control circuit further includes a first filtering module; the connection between the first filtering module and the inverting module, the push-pull module and the adjustment module is used to filter the voltage input to the inverting module, the push-pull module and the adjustment module.

[0012] In some embodiments, the solenoid valve control circuit further includes a second filtering module; the second filtering module is connected to the sampling module and is used to filter the control signal output by the sampling module to the solenoid valve.

[0013] Secondly, this utility model provides a solenoid valve control device, which includes the solenoid valve control circuit described above.

[0014] Thirdly, this utility model embodiment provides a pneumatic comfort system, including an air bag, a solenoid valve, the aforementioned solenoid valve control device, 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 control device controls the operation of the solenoid valve.

[0015] Unlike existing technologies, this utility model provides a solenoid valve control circuit and device. The solenoid valve control circuit includes: an inverting module, a push-pull module, an adjustment module, a sampling module, and a control module. The inverting module is connected to the control module via a PWM control interface, and is also connected to the push-pull module, the adjustment module, the sampling module, and the control module. The inverting module is used to turn on when the received PWM signal is at a first level, or to turn off when the received PWM signal is at a second level. The push-pull module is used to output a first control signal when the inverting module is on, or to output a second control signal when the inverting module is off. The adjustment module is used to turn on when the first control signal is received, or to turn off when the second control signal is received. The sampling module is used to acquire a voltage signal or a current signal when the adjustment module is on. The control module outputs a PWM signal and adjusts the duty cycle of the output PWM signal according to the voltage or current signal acquired from the sampling module. In this embodiment of the invention, by controlling the duty cycle of the PWM signal, the voltage input to the coil of the solenoid valve is adjusted, thereby regulating the current in the coil to achieve more precise control of the solenoid valve. For example, at the instant the solenoid valve is energized, the duty cycle of the PWM is detected and adjusted in real time, allowing the current to rise gradually within the current control range, rather than directly applying the maximum current; and after the iron core of the solenoid valve loosens, the current is reduced, and the duty cycle of the PWM is readjusted until the maximum current is reached. During this control process, the valve core of the solenoid valve will not maintain high acceleration and impact the valve body, avoiding significant noise caused by high-speed impact. Ultimately, maintaining the maximum current ensures that the valve core of the solenoid valve remains in the open position. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0017] Figure 1 This is a structural block diagram of the solenoid valve control circuit provided in this embodiment of the utility model;

[0018] Figure 2 This is a structural block diagram of the solenoid valve control circuit with a first filter module and a second filter module provided in this embodiment of the utility model;

[0019] Figure 3 This is a schematic diagram of the circuit structure of the inverting module, push-pull module, adjustment module, and first filter module provided in this embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the circuit structure of the sampling module and the second filtering module provided in this embodiment of the utility model;

[0021] Figure 5 This is a schematic diagram of the circuit structure of the control module provided in an embodiment of the present utility model;

[0022] Figure 6 This is a schematic diagram of the current regulation curve provided in an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and thoroughly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0024] The technical features involved in the various embodiments of the present invention described below do not conflict with each other and can be combined with each other.

[0025] When an element is described as "connected" to another element, it can be directly connected to the other element, or there may be one or more intervening elements between them.

[0026] The terms "first," "second," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, the first object can be one or more.

[0027] Please see Figure 1 , Figure 1 This is a structural block diagram of the solenoid valve control circuit 100 provided in this embodiment of the utility model.

[0028] This utility model embodiment provides a solenoid valve control circuit 100, including: an inverting module 11, a push-pull module 12, an adjustment module 13, a sampling module 14, and a control module 15.

[0029] The inverting module 11 is connected to the control module 15 via a PWM control interface (not shown in the figure), and the inverting module 11 is also connected to the push-pull module 12. The push-pull module 12 is also connected to the adjustment module 13. The adjustment module 13 is also connected to the sampling module 14. The sampling module 14 is also connected to the control module 15.

[0030] Specifically, the inverting module 11 is used to turn on when the received PWM signal is at a first level, or to turn off when the received PWM signal is at a second level; the push-pull module 12 is used to output a first control signal when the inverting module 11 is on, or to output a second control signal when the inverting module 11 is off; the adjustment module 13 is used to turn on when the first control signal is received, or to turn off when the second control signal is received; the sampling module 14 is used to acquire voltage or current signals when the adjustment module 13 is on; and the control module 15 is used to output a PWM signal and adjust the duty cycle of the output PWM signal according to the voltage or current signal acquired by the sampling module 14.

[0031] The PWM control interface is used to transmit PWM signals. This PWM control interface allows the control module 15 to be designed and developed relatively independently, while also facilitating connection with different types of inverting modules 11. In practical applications, control modules and inverting modules with different performance characteristics can be selected according to specific needs and integrated through the PWM control interface, thereby achieving flexible system configuration and expansion. For example, in an industrial automation system, different control modules can be replaced according to different control tasks without large-scale modifications to the entire circuit; it is only necessary to ensure that the new control module is compatible with the PWM control interface.

[0032] A PWM signal consists of a series of pulses at a fixed frequency. These pulses alternate between high and low levels in time. By changing the pulse width (i.e., the duration of the high level), the average voltage or power of the circuit output signal can be controlled.

[0033] In some embodiments, the first level is high and the second level is low. The first control signal is low and the second control signal is high.

[0034] It should be noted that the solenoid valve 300 is a basic automation component that uses electromagnetic force to control the on / off state or flow rate of fluids (such as gases). It mainly consists of a solenoid coil, valve core, valve body, and spring. When the solenoid coil is energized, it generates a magnetic field, which acts on the valve core. The valve core is typically a movable ferromagnetic component that, under the influence of the magnetic field, overcomes the spring force (if any) to produce displacement.

[0035] For example, a pneumatic comfort system includes an air bag, a solenoid valve, the aforementioned solenoid valve controller, 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 operation of the solenoid valve.

[0036] In a pneumatic comfort system, the solenoid valve 300 acts as a valve, controlling the gas passage between the air supply device and the air bag. When the solenoid coil of the solenoid valve receives a control signal from the solenoid valve controller (such as the voltage signal controlled by the PWM signal after the duty cycle is adjusted by the control module 15, as mentioned above), if the solenoid coil is energized, the generated magnetic force causes the valve core to move, opening the gas passage, allowing gas in the air supply device to flow to the air bag and inflate it. If the solenoid coil is de-energized, the magnetic field disappears, and the valve core resets under the action of the spring force, closing the gas passage and preventing gas flow or changing the direction of gas flow (depending on the specific type of solenoid valve, such as a three-way solenoid valve). By precisely controlling the opening, closing, and opening degree of the solenoid valve 300 through the solenoid valve control circuit 100, precise control of the amount of gas in the air bag can be achieved, thereby achieving the comfort adjustment function required by the pneumatic comfort system. For example, in the pneumatic adjustment system of a car seat, the shape and firmness of the seat are adjusted by controlling the inflation amount of the air bag.

[0037] In practical applications, the control module 15 first outputs a PWM signal. This PWM signal is the starting signal for the entire control process, and its initial duty cycle and other parameters can be set according to the system's preset requirements. For example, when the system starts up, there may be a default duty cycle to initialize the circuit's operating state.

[0038] Secondly, the inverting module 11 receives the PWM signal output by the control module 15. When this PWM signal is at the first level (assuming the first level is high, depending on the circuit design), the inverting module 11 is turned on. If the PWM signal is at the second level (e.g., low, depending on the circuit design), the inverting module 11 remains in the off state, and subsequent modules in the circuit will not be triggered to work.

[0039] Then, the push-pull module 12 outputs a first control signal when the inverting module 11 is turned on, and outputs a second control signal when the inverting module 12 is turned off.

[0040] Next, the adjustment module 13 turns on after receiving the first control signal output by the push-pull module 12, and the power supply 200 supplies power to the solenoid valve 300 through the turned-on adjustment module 13. Conversely, when the adjustment module 13 receives the second control signal output by the push-pull module 12, it turns off, and the power supply 200 cannot supply power to the solenoid valve 300.

[0041] Then, with the adjustment module 13 turned on, the sampling module 14 begins to operate. The sampling module 14 acquires voltage or current signals.

[0042] Next, the sampling module 14 feeds back the acquired voltage or current signal to the control module 15. The control module 15 adjusts the duty cycle of the PWM signal based on the voltage or current signal.

[0043] If the voltage or current signal is less than the expected value, the control module 15 may increase the duty cycle of the PWM signal, thereby increasing the average power supplied to the solenoid valve 300 and making the current in the solenoid valve 300 approach the expected value; conversely, if the voltage or current signal is greater than the expected value, the duty cycle of the PWM signal will be reduced, making the current in the solenoid valve 300 approach the expected value.

[0044] By continuously repeating the above sampling, calculation, and adjustment process, the control module 15 can precisely control the operating state of the solenoid valve 300. For example, by precisely controlling the current of the solenoid valve 300, precise control of the solenoid valve can be achieved. In this process, the circuit gradually reaches a stable operating state, ensuring that the solenoid valve 300 operates as expected.

[0045] Please see Figure 2 , Figure 2 This is a structural block diagram of the solenoid valve control circuit 100 provided in this embodiment of the utility model.

[0046] In some embodiments, the solenoid valve control circuit 100 further includes a first filter module 16.

[0047] The first filter module 16 is connected to the power supply 200 during operation.

[0048] Specifically, the first filtering module 16 is used to filter the voltage output by the power supply 200.

[0049] In some embodiments, the solenoid valve control circuit 100 further includes a second filter module 17.

[0050] The sampling module 14 is connected to the solenoid valve 300 through the second filtering module 17.

[0051] Specifically, the second filtering module 17 is used to filter the signal from the input solenoid valve 300.

[0052] Please see Figure 3 , Figure 3 This is a schematic diagram of the circuit structure of the inverting module 11, push-pull module 12, adjustment module 13, and first filter module 16 provided in this embodiment of the utility model.

[0053] In some embodiments, the first filtering module 16 includes capacitor C4 and capacitor C5.

[0054] During operation, the first terminals of capacitors C4 and C5 are connected to power supply 200, and the second terminals of capacitors C4 and C5 are connected and grounded during operation.

[0055] In some embodiments, the inverting module 11 includes a switching transistor Q4, resistors R9, R11, R12, and R13.

[0056] Among them, the first end of resistor R13 is connected to control module 15 through PWM control interface (not shown in the figure), the second end of resistor R13 is connected to the control terminal of switch Q4 and the first end of resistor R12, the second end of switch Q4 is connected to the second end of resistor R12 and grounded during operation, the first end of switch Q4 is connected to power supply 200 through resistor R9 during operation, and the first end of switch Q4 is also connected to push-pull module 12 through resistor R11.

[0057] The inverting module 11 also includes a capacitor C6. One end of the capacitor C6 is connected to the control terminal of the switching transistor Q4, and the other end is connected to the second terminal of the switching transistor Q4 and grounded during operation.

[0058] In this embodiment, the switching transistor Q4 is an NPN transistor. Specifically, the control terminal of the switching transistor Q4 is the base of the NPN transistor, the first terminal of the switching transistor Q4 is the collector of the NPN transistor, and the second terminal of the switching transistor Q4 is the emitter of the NPN transistor.

[0059] In addition, the switching transistor Q4 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, etc.

[0060] In some embodiments, the push-pull module 12 includes a switch Q2, a switch Q3, a resistor R8, and a resistor R10.

[0061] The control terminals of both switching transistors Q2 and Q3 are connected to the inverting module 11. The first terminal of switching transistor Q2 is connected to the power supply 200 during operation. The second terminal of switching transistor Q2 is connected to the first terminal of switching transistor Q3. The second terminal of switching transistor Q3 is grounded during operation. The second terminal of switching transistor Q2 is also connected to the first terminal of resistor R10. The second terminal of resistor R10 is also connected to the power supply 200 through resistor R8 during operation. The second terminal of resistor R10 is also connected to the adjustment module 13.

[0062] In this embodiment, switch Q2 is an NPN transistor and switch Q3 is a PNP transistor. Specifically, the control terminal of switch Q2 is the base of the NPN transistor, the first terminal of switch Q2 is the collector of the NPN transistor, and the second terminal of switch Q2 is the emitter of the NPN transistor. The control terminal of switch Q3 is the base of the PNP transistor, the first terminal of switch Q3 is the emitter of the PNP transistor, and the second terminal of switch Q3 is the collector of the PNP transistor.

[0063] In addition, switching transistors Q2 and Q3 can be any controllable switch, such as insulated gate bipolar transistor (IGBT) devices, integrated gate commutated thyristor (IGCT) devices, gate turn-off thyristor (GTO) devices, silicon controlled rectifier (SCR) devices, junction gate field-effect transistor (JFET) devices, etc.

[0064] In some embodiments, the adjustment module 13 includes a switching transistor Q1, a Zener diode D1, and a Zener diode D2.

[0065] Among them, the control terminal of the switching transistor Q1 is connected to the push-pull module 12, the first terminal of the switching transistor Q1 is connected to the negative terminal of the Zener diode D1 and the power supply 200, the positive terminal of the Zener diode D1 is connected to the positive terminal of the Zener diode D2, the negative terminal of the Zener diode D2 is connected to the control terminal of the switching transistor Q1, and the second terminal of the switching transistor Q1 ( Figure 3 The end labeled A in the diagram is connected to the sampling module 14.

[0066] In this embodiment, the switching transistor Q1 is a PMOS transistor. Specifically, the control terminal of the switching transistor Q1 is the gate of the PMOS transistor, the first terminal of the switching transistor Q1 is the source of the PMOS transistor, and the second terminal of the switching transistor Q1 is the drain of the PMOS transistor.

[0067] In addition, the switching transistor Q4 can be any controllable switch, such as an insulated gate bipolar transistor (IGBT) device, an integrated gate commutated thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier (SCR) device, a junction gate field-effect transistor (JFET) device, etc.

[0068] Please see Figure 4 , Figure 4 This is a schematic diagram of the circuit structure of the sampling module 14 and the second filtering module 17 provided in this embodiment of the utility model.

[0069] In some embodiments, the sampling module 14 includes a first voltage acquisition circuit 141 and a second voltage acquisition circuit 142. The first voltage acquisition circuit 141 is used to acquire a first voltage signal when the adjustment module 13 is turned on, and the second voltage acquisition circuit 142 is used to acquire a second voltage signal when the adjustment module 13 is turned on.

[0070] like Figure 4 As shown, the first voltage acquisition circuit 141 includes resistors R1, R2, R3, and capacitor C2. The second voltage acquisition circuit 142 includes resistors R5, R6, R7, and capacitor C3. The sampling module 14 also includes resistor R4.

[0071] Among them, the first end of resistor R4 ( Figure 4 One end (marked A) is connected to the first end of resistor R5 and adjustment module 13. The second end of resistor R4 is connected to the first end of resistor R2 and solenoid valve 300. The second end of resistor R5 is connected to the first end of resistor R6 and the first end of resistor R7. The second end of resistor R7 is connected to the first end of capacitor C3 and control module 15. The second end of resistor R6 is connected to the second end of capacitor C3 and grounded during operation. The second end of resistor R2 is connected to the first end of resistor R1 and the first end of resistor R3. The second end of resistor R1 is connected to the first end of capacitor C2 and control module 15. The second end of resistor R3 is connected to the second end of capacitor C2 and grounded during operation.

[0072] In some embodiments, the second filtering module 17 includes a capacitor C1.

[0073] The first end of capacitor C1 is connected to sampling module 14, and the second end of capacitor C1 is grounded during operation.

[0074] Please see Figure 5 , Figure 5 This is a schematic diagram of the circuit structure of the control module 15 provided in this embodiment of the utility model.

[0075] The control module 15 includes a controller U1.

[0076] The first pin of controller U1 is connected to the inverting module 11 (PWM output interface in the figure), the seventh pin of controller U1 is connected to the first voltage acquisition circuit 141 of sampling module 14 (P_AD input interface in the figure), the fifth pin of controller U1 is connected to the second voltage acquisition circuit 142 of sampling module 14 (N_AD input interface in the figure), the eighth pin of controller U1 is connected to a DC power supply (e.g., a +5V DC power supply), and the fourth pin of controller U1 is grounded during operation. Specifically, this DC power supply is the voltage output after stepping down power supply 200, which can be implemented using an LDO (low dropout linear regulator).

[0077] The controller U1 can be an MCU (Micro Control Unit) or other device capable of "outputting a PWM signal and adjusting the duty cycle of the output PWM signal based on the voltage or current signal acquired by the self-sampling module". Furthermore, the functions of each pin of the controller U1 can be changed through programming or other means.

[0078] The following combination Figure 3 , Figure 4 , Figure 5 The working principle of the solenoid valve control circuit 100 is explained.

[0079] First, the voltage output from power supply 200 passes through the first filter module 16. The first filter module 16 consists of capacitors C4 and C5, which is a typical capacitor filter circuit. Capacitors are characterized by "blocking DC and passing AC," presenting low impedance to AC components (such as ripple voltage) in the power supply, while acting as an open circuit to DC components. The DC components in the power supply mainly provide a stable operating voltage for the circuit, while AC components may originate from internal switching elements or external interference. Capacitors C4 and C5 are connected in parallel across the power supply, bypassing the AC ripple to ground, thus making the voltage output to subsequent circuits smoother and more stable, reducing the impact of power supply fluctuations on the circuit, and providing a relatively clean power supply for the entire solenoid valve control circuit.

[0080] The control module 15 (taking controller U1 as an example, it can be an MCU, etc.) outputs a PWM signal.

[0081] The inverting module 11 receives the PWM signal output by the control module 15. When the PWM signal is applied to the control terminal of the switching transistor Q4 through resistor R13, if the PWM signal is at the first level (high level for an NPN transistor), the switching transistor Q4 is turned on. At this time, current flows from the power supply 200 through resistor R9 and Q4 to ground, and the first and second terminals (collector-emitter) of the switching transistor Q4 act as a closed switch. If the PWM signal is at the second level (high level), the switching transistor Q4 is turned off.

[0082] When switch Q4 in inverter module 11 is turned on, push-pull module 12 starts working. When switch Q4 is turned on, switch Q2 is turned off and switch Q3 is turned on. When switch Q4 is turned off, switch Q2 is turned on and switch Q3 is turned off. When switch Q2 is turned off and switch Q3 is turned on, the power supply passes through resistor R8, resistor R10, and switch Q3 to ground in sequence. The second terminal of resistor R10 (the control terminal of switch Q1) then outputs the first control signal (high-level signal). When switch Q2 is turned on and switch Q3 is turned off, the second terminal of resistor R10 outputs the second control signal (low-level signal).

[0083] The gate of the switching transistor Q1 in the adjustment module 13 is connected to the push-pull module 12. When the first control signal (high-level signal) output by the push-pull module 12 is applied to the gate of the switching transistor Q1, the switching transistor Q1 is turned on (the source and drain of the switching transistor Q1 are connected). When the second control signal (low-level signal) output by the push-pull module 12 is applied to the gate of the switching transistor Q1, the switching transistor Q1 is turned off (the source and drain of the switching transistor Q1 are not connected).

[0084] Zener diodes D1 and D2 serve to regulate voltage. When power supply 200 supplies power to subsequent circuits through switching transistor Q1, Zener diodes D1 and D2, through their own voltage regulation characteristics, ensure that the gate voltage of switching transistor Q1 is within a suitable range, thereby stabilizing the conduction state of Q1 and ensuring the stability of the voltage output to sampling module 14.

[0085] When the voltage output by the adjustment module 13 is applied to the sampling module 14, the first voltage signal and the second voltage signal can be acquired through the voltage division effect of the resistor.

[0086] The capacitor C1 in the second filtering module 17 filters the signal input to the solenoid valve 300. The capacitor C1 bypasses the AC components (such as high-frequency noise) of the signal input to the solenoid valve 300 to ground, making the signal input to the solenoid valve 300 purer and avoiding interference from high-frequency noise and other factors on the normal operation of the solenoid valve 300.

[0087] After receiving the first and second voltage signals collected by the sampling module 14, the controller U1 of the control module 15 adjusts the duty cycle of the output PWM signal according to the first and second voltage signals. Specifically, by controlling the duty cycle of the PWM output, the voltage input to the coil of the solenoid valve is adjusted, thereby adjusting the current on the coil. At the moment the solenoid valve is energized, the PWM duty cycle is detected and adjusted in real time, allowing the current to rise gradually within the current control range, rather than directly applying the maximum current. After the iron core loosens, the current is reduced, and the PWM duty cycle is readjusted until the maximum current is reached. During this control process, the valve core will not maintain high acceleration and impact the valve body, avoiding significant noise caused by high-speed impact. Ultimately, maintaining the maximum current ensures that the valve core remains in the open position.

[0088] Please see Figure 6 , Figure 6 This is a schematic diagram of the current regulation curve provided in an embodiment of the present invention.

[0089] exist Figure 6 In the graph, the horizontal axis represents time in seconds (S), and the vertical axis represents current in amperes (A).

[0090] In practical applications, the control module can calculate the operating current of the solenoid valve based on the first voltage signal and the second voltage signal. Furthermore, the control module 15 can... Figure 6 The duty cycle of the PWM signal is adjusted based on the current control curve and the operating current of the solenoid valve. Specifically, by controlling the duty cycle of the PWM output, the voltage input to the coil of the solenoid valve is adjusted, thereby regulating the current in the coil. At the moment the solenoid valve is energized, the PWM duty cycle is detected and adjusted in real time, allowing the current to rise gradually within the current control range, rather than directly applying the maximum current. After the iron core loosens, the current is reduced, and the PWM duty cycle is readjusted until the maximum current is reached. During this control process, the valve core will not maintain high acceleration and impact the valve body, avoiding significant noise caused by high-speed impact. Ultimately, maintaining the maximum current ensures that the valve core remains in the open position. By continuously adjusting the duty cycle of the PWM signal based on the first and second voltage signals, precise control of the solenoid valve 300 is achieved.

[0091] This embodiment of the invention can calculate the current of the solenoid valve by detecting the voltage across resistor R4, thereby achieving precise control and reducing noise.

[0092] During the operation of the solenoid valve 300, the magnitude of the current directly affects the switching speed of the valve core displacement within the solenoid valve 300. When the control module 15 precisely controls the current of the solenoid valve 300 according to the current regulation curve, the movable parts inside the solenoid valve, such as the valve core, can open or close the valve port at a precise and controllable speed, thereby achieving stable switching of the working state of the solenoid valve 300. For example, if the operating current is large, the movement speed and force of the valve core under the action of electromagnetic force will also be large, which may cause a strong impact between the valve core and the valve body, resulting in significant noise. However, by precisely controlling the current to approach the expected value, the valve core movement becomes smoother, allowing the valve core to move in a more gradual manner to open or close the valve port, reducing the noise generated by high-speed impacts.

[0093] In summary, in this embodiment of the invention, by controlling the duty cycle of the PWM signal, the voltage input to the coil of the solenoid valve is adjusted, thereby regulating the current in the coil, to achieve more precise control of the solenoid valve. For example, at the instant the solenoid valve is energized, the duty cycle of the PWM is detected and adjusted in real time, allowing the current to rise gradually within the current control range, rather than directly applying the maximum current; and after the iron core of the solenoid valve loosens, the current is reduced, and the duty cycle of the PWM is readjusted until the maximum current is reached. During this control process, the valve core of the solenoid valve will not maintain high acceleration and impact the valve body, avoiding significant noise generated by high-speed impact. Ultimately, maintaining the maximum current ensures that the valve core of the solenoid valve remains in the open position.

[0094] This utility model embodiment also provides a solenoid valve control device, which includes the solenoid valve control circuit 100 as described above.

[0095] In some embodiments, the solenoid valve control device is used to control the solenoid valve.

[0096] This utility model embodiment also provides a pneumatic comfort system, which includes an air bag, a solenoid valve, the aforementioned solenoid valve controller, and an air supply device. The air supply device can be, but is not limited to, an air pump, an air compressor, etc., or the air supply device and the solenoid valve can be integrated into a pump-valve structure. The air supply device is connected to the air bag for air supply through the solenoid valve, and the air supply device supplies air to the air bag. The solenoid valve controls the inflation and deflation of the air bag, and the solenoid valve controller can control the operation of the solenoid valve.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, and there are many other variations of different aspects of this utility model as described above. For the sake of brevity, they are not provided in detail; although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A solenoid valve control circuit, characterized in that, include: Inverting module, push-pull module, adjustment module, sampling module, control module; The inverting module is connected to the control module via a PWM control interface, and the inverting module is also connected to the push-pull module, the push-pull module is also connected to the adjustment module, the adjustment module is also connected to the sampling module, and the sampling module is also connected to the control module. The inverting module is used to turn on when the received PWM signal is at a first level, or to turn off when the received PWM signal is at a second level; The push-pull module is used to output a first control signal when the inverting module is turned on, or to output a second control signal when the inverting module is turned off; The adjustment module is used to turn on when the first control signal is received, or to turn off when the second control signal is received; The sampling module is used to acquire voltage or current signals when the adjustment module is turned on. The control module is used to output a PWM signal and adjust the duty cycle of the output PWM signal according to the voltage signal or current signal received from the sampling module.

2. The solenoid valve control circuit according to claim 1, characterized in that, The inverting module includes a switch Q4, resistors R9, R11, R12, and R13; The first end of resistor R13 is connected to the control module through the PWM control interface. The second end of resistor R13 is connected to the control terminal of switch Q4 and the first end of resistor R12. The second end of switch Q4 is connected to the second end of resistor R12 and is grounded during operation. The first end of switch Q4 is connected to the power supply through resistor R9 during operation. The first end of switch Q4 is also connected to the push-pull module through resistor R11.

3. The solenoid valve control circuit according to claim 1, characterized in that, The push-pull module includes a switch Q2, a switch Q3, a resistor R8, and a resistor R10; The control terminals of both the switching transistor Q2 and the switching transistor Q3 are connected to the inverting module. The first terminal of the switching transistor Q2 is connected to the power supply during operation, and the second terminal of the switching transistor Q2 is connected to the first terminal of the switching transistor Q3. The second terminal of the switching transistor Q3 is grounded during operation. The second terminal of the switching transistor Q2 is also connected to the first terminal of the resistor R10. The second terminal of the resistor R10 is connected to the power supply through the resistor R8 during operation, and the second terminal of the resistor R10 is also connected to the adjustment module.

4. The solenoid valve control circuit according to claim 1, characterized in that, The adjustment module includes a switching transistor Q1, a Zener diode D1, and a Zener diode D2; The control terminal of the switching transistor Q1 is connected to the push-pull module. The first terminal of the switching transistor Q1 is connected to the power supply when the negative terminal of the Zener diode D1 is in operation. The positive terminal of the Zener diode D1 is connected to the positive terminal of the Zener diode D2. The negative terminal of the Zener diode D2 is connected to the control terminal of the switching transistor Q1. The second terminal of the switching transistor Q1 is connected to the sampling module.

5. The solenoid valve control circuit according to claim 1, characterized in that, The sampling module includes a first voltage acquisition circuit and a second voltage acquisition circuit, which are used to acquire a first voltage signal and a second voltage signal respectively when the adjustment module is turned on. The first voltage acquisition circuit includes resistors R1, R2, R3, and capacitor C2; the second voltage acquisition circuit includes resistors R5, R6, R7, and capacitor C3; and the sampling module further includes resistor R4. The first end of resistor R4 is connected to the first end of resistor R5 and the adjustment module; the second end of resistor R4 is connected to the first end of resistor R2 and the solenoid valve; the second end of resistor R5 is connected to the first ends of resistor R6 and resistor R7; the second end of resistor R7 is connected to the first end of capacitor C3 and the control module; the second end of resistor R6 is connected to the second end of capacitor C3 and is grounded during operation; the second end of resistor R2 is connected to the first ends of resistor R1 and resistor R3; the second end of resistor R1 is connected to the first end of capacitor C2 and the control module; the second end of resistor R3 is connected to the second end of capacitor C2 and is grounded during operation.

6. The solenoid valve control circuit according to claim 1, characterized in that, The control module includes a controller U1; The first pin of the controller U1 is connected to the inverting module, the seventh pin of the controller U1 is connected to the sampling module, the fifth pin of the controller U1 is connected to the sampling module, the eighth pin of the controller U1 is connected to the power supply when working, and the fourth pin of the controller U1 is grounded when working.

7. The solenoid valve control circuit according to any one of claims 1 to 6, characterized in that, The solenoid valve control circuit also includes a first filtering module; The connection between the first filtering module and the inverting module, the push-pull module and the adjustment module is used to filter the voltage input to the inverting module, the push-pull module and the adjustment module.

8. The solenoid valve control circuit according to claim 1, characterized in that, The solenoid valve control circuit also includes a second filtering module; The second filtering module is connected to the sampling module and is used to filter the control signal output by the sampling module to the solenoid valve.

9. A solenoid valve control device, characterized in that, The solenoid valve control device includes the solenoid valve control circuit as described in any one of claims 1 to 8.

10. A pneumatic comfort system, characterized in that, The device includes an air bag, a solenoid valve, the solenoid valve control device as described in claim 9, 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 control device controls the operation of the solenoid valve.

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