A solenoid valve quick switch control and current recovery device and method

Abstract

The present application relates to solenoid valve drive control technical field, specifically to a kind of solenoid valve quick switch control and current recovery device and method.The above-mentioned device includes power input module, fast drive module, current recovery module, protection module and interface module;Power input module input end is connected with sampling power interface module, output end is connected with protection module I, and protection module I current recovery module is connected to provide power supply for it;The input end of fast drive module is connected with protection module II and control interface module, and the output end is connected with the input end of current recovery module, the input end of protection module II is connected with drive power interface module, the output end of current recovery module is connected with power output interface module and current output interface module, and the output end of power output interface module is connected with the input end of solenoid valve;Real-time accurate current acquisition, multistage safety protection and guide rail type integrated installation can improve the response speed of solenoid valve control, acquisition accuracy and operating reliability.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic valve drive control technology, specifically to a device and method for rapid switching control and current sampling of electromagnetic valves. Background Technology

[0002] The solenoid valve of a rocket engine is a core actuator in a liquid rocket propulsion system responsible for precisely controlling the on / off state and flow rate of media such as fuel and oxidizer. Its performance directly determines the engine's working accuracy and reliability. However, existing solenoid valve drive control schemes have the following drawbacks: 1) Slow switching speed: The inductive coil has a long freewheeling time and obvious turn-off tail, which cannot meet the requirements of high-frequency fast switching. 2) Low current acquisition accuracy: The sampling circuit mostly uses sampling resistors, which have weak anti-interference ability and large accuracy error; 3) Inadequate protection mechanism: Lack of graded overcurrent, reverse connection, and discharge protection, making the coil and driving device prone to damage; 4) Poor integration and installability: complex wiring and large size, not suitable for high-density DIN rail deployment.

[0003] In addition, most existing technologies implement the driving or acquisition functions separately, without integrating fast switching, accurate data acquisition, hierarchical protection, and a compact guide rail structure into an integrated design, making it difficult to meet the high reliability, high precision, and fast response control requirements of rocket engine hot-fire testing sites. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing a device and method for rapid switching control and current sampling of electromagnetic valves. It enables high-speed switching, real-time and accurate current sampling, multi-level safety protection, and rail-mounted integrated installation, thereby improving the response speed, sampling accuracy, and operational reliability of electromagnetic valve control.

[0005] This invention relates to a device for rapid switching control and current sampling of an electromagnetic valve, comprising: Power input module: Connects to an external DC24V power supply, which provides ±15V power to the current sampling module after voltage regulation, filtering and stabilization; Fast drive module: Composed of MOSFET switching transistor, driver chip, and fast freewheeling discharge circuit, it receives signals to realize the high-speed on / off switching of solenoid valve; Current sampling module: It uses a high-precision Hall current transformer to sample the current, and after amplification and filtering, the sampled current is sent to the acquisition system to realize real-time current sampling and feedback. Protection Module I and Protection Module II: Includes a 10A main circuit, a 2A branch circuit and a 0.1A control circuit fuse, as well as overcurrent detection, overheat protection and reverse power connection protection; The interface modules include a sampling power interface module, a drive power interface module, a power output interface module, a control interface module, and a current output interface module; they adopt pluggable terminal blocks.

[0006] As a further improvement of the present invention, the input end of the power input module is connected to a sampling power interface module, and the output end is connected to a protection module I. The output end of the protection module I is connected to the input end of the current sampling module to provide power to it. The input end of the fast drive module is connected to the protection module II and the control interface module respectively, and the output end is connected to the input end of the current sampling module. The input end of the protection module II is connected to a drive power interface module. The output end of the current sampling module is connected to the power output interface module and the current output interface module respectively. The output end of the power output interface module is connected to the input end of the solenoid valve.

[0007] As a further improvement of the present invention, the protection module I consists of a fuse I, a diode I, an LED indicator I, and a current-limiting resistor I.

[0008] As a further improvement of the present invention, the protection module II is composed of fuse II, current limiting resistor II, LED indicator II, diode II, branch fuse and varistor.

[0009] As a further improvement of the present invention, the fast drive module includes a MOSFET switch, a diode III, and a bleeder resistor. The drive input terminal of the MOSFET switch is connected to the branch fuse, the drive output terminal is connected to the input terminal of the current sampling module, the control input terminal of the MOSFET switch is connected to the interface module, and the diode III and the bleeder resistor are connected in series and then in parallel with the output interface module.

[0010] As a further improvement of the present invention, the current sampling module is composed of a Hall transformer, resistor I, operational amplifier, capacitor I, resistor II, capacitor III, resistor III, and capacitor III. The input terminal of the Hall transformer is connected to the drive output terminal of the MOSFET switch, and the output terminal is connected to the output interface module. The secondary winding output terminal of the Hall transformer is connected to the operational amplifier and is in parallel with resistor I. The power input contact of the operational amplifier is connected to protection module I. The power input point of the operational amplifier is in parallel with capacitor II and capacitor I. The secondary winding input terminal of the operational amplifier is connected to the input terminal of resistor II and the output terminal is connected to the signal output terminal of the operational amplifier. The signal output terminal of the operational amplifier is connected in series with resistor III and then connected to capacitor III and the current output interface module.

[0011] The method for rapid switching control and current sampling of a solenoid valve according to the present invention includes the following steps: The sampling power interface module is connected to a DC24V power supply. After passing through the power input module and protection module I, it provides power to the current recovery module. The current recovery module outputs the collected current signal and enters the engine test bench acquisition system through the current output interface module. The drive power interface module is connected to the DC27V drive power supply of the solenoid valve. After passing through protection module II, fast drive module, current recovery module and power output interface module, it is connected to the solenoid valve. The fast switching of the solenoid valve is controlled by the control interface module receiving the control signal from the engine test bench control system, which in turn controls the fast switching of the fast drive module. The fast switching of the fast drive module controls the opening or closing of the solenoid valve.

[0012] This invention discloses a rapid switching control and current sampling device and method for electromagnetic valves, applicable to various DC electromagnetic valves. It is the first to deeply integrate four key technologies: rapid switching drive, high-precision current sampling, graded fuse protection, and a compact rail-mounted structure, forming an integrated electromagnetic valve control and acquisition board. This solves the industry pain points of traditional solutions, such as slow response, inaccurate data acquisition, incomplete protection, and inconvenient installation. It possesses four innovative advantages: high speed, high precision, high reliability, and high integration. Specific effects are described below: 1. Fast switching speed: Employing a composite circuit of MOSFET high-speed drive and fast freewheeling discharge, the solenoid valve achieves microsecond-level turn-on and turn-off, significantly reducing inductive load turn-off tailing. It supports a segmented drive strategy of high duty cycle engagement and low duty cycle maintenance, reducing coil heating and improving high-frequency operational stability. This overcomes the tens of millisecond delay bottleneck of traditional relay / ordinary drive circuits, meeting the requirements of high-frequency, high-precision fluid control. 2. High accuracy of current sampling: High-precision Hall current transformers are used for sampling, which is then amplified and filtered before being sent to the acquisition system to achieve real-time current sampling and feedback. This system has strong common-mode interference suppression, good dynamic response, and achieves real-time, distortion-free, and high-precision current sampling. It can capture instantaneous current, peak current, and effective current. It solves the problems of poor anti-interference, weak dynamics, and reading drift of traditional sampling, and meets the requirements of precision detection and status monitoring. 3. Graded protection: Tiered fuse protection: 10A fuse for the main circuit, 2A fuse for the branch circuit, and 0.1A fuse for the control circuit, achieving zoned protection for strong and weak currents, making fault location clearer. Dual fuse tiered protection + overcurrent / overheat / reverse connection protection enhances system reliability; integrated overcurrent, overheat, reverse connection, and coil freewheeling discharge multiple hardware protections provide comprehensive protection for devices and loads; unlike traditional single-fuse, simple protection without reverse connection / discharge, reliability and safety are significantly improved. 4. Integrated and easy to use: Standard DIN rail mounting, suitable for high-density deployment in industrial control cabinets; pluggable terminal blocks ensure quick and reliable wiring. Integrated single-board design fully integrates drive, data acquisition, protection, and interfaces, reducing wiring, minimizing size, and lowering failure rate. Attached Figure Description

[0013] Figure 1 This is a system structure block diagram of the present invention; Figure 2 This is the electrical schematic diagram of the present invention; Figure 3 This is a schematic diagram of the PCB layout of the present invention. Detailed Implementation

[0014] The present invention provides a solenoid valve rapid switching control and current sampling device, comprising a power input module 2, a rapid drive module 6, a current sampling module 7, a protection module I 3, a protection module II 5, and an interface module, as detailed below: Power input module 2: Connects to an external DC24V power supply, which provides ±15V power to the current sampling module after voltage regulation, filtering and stabilization; Fast drive module 6: It consists of a MOSFET switch, a driver chip, and a fast freewheeling discharge circuit, and receives signals to realize the high-speed on / off switching of the solenoid valve; Current sampling module 7: It uses a high-precision Hall current transformer for sampling, and after amplification and filtering, it is sent to the acquisition system to realize real-time current sampling and feedback; Protection module I3 and protection module II5: contain a 10A main circuit, a 2A branch circuit and a 0.1A control circuit fuse, as well as overcurrent detection, overheat protection and reverse power connection protection; The interface modules include a sampling power interface module 1, a power interface module 4, an output interface module 8, a control interface module 10, and a current output interface module 11. The interface modules employ pluggable terminals and busbars, with a busbar current carrying capacity ≥10A and a branch current carrying capacity ≥3A.

[0015] In the aforementioned modules, the output of sampling power interface module 1 is connected to power input module 2 and protection module I 3 to provide power to current recovery module 7; the output of drive power interface module 4 is connected to protection module II 5, fast drive module 6, current recovery module 7 and output interface module 8 to connect to solenoid valve coil 9; the output of control interface module 10 is connected to control terminal 6 of fast drive module; and the output of current recovery module 7 is connected to current output interface module 11.

[0016] Furthermore, the input terminal of the power input module 2 is connected to the sampling power interface module 1, and the output terminal is connected to the protection module I 3. The output terminal of the protection module I 3 is connected to the input terminal of the current sampling module 7 to provide power to it. The input terminal of the fast drive module 6 is connected to the protection module II 5 and the control interface module 10 respectively, and the output terminal is connected to the input terminal of the current sampling module 7. The input terminal of the protection module II 5 is connected to the drive power interface module 4. The output terminal of the current sampling module 7 is connected to the output interface module 8 and the current output interface module 11 respectively. The output terminal of the output interface module 8 is connected to the input terminal of the solenoid valve 9.

[0017] Furthermore, the protection module I3 consists of fuse I12, diode I15, LED indicator I14, and current-limiting resistor I13. The output terminal of the power input module 2 is connected to the input terminal of fuse I12, and the output terminal of fuse I12 is connected to the power input point of operational amplifier 27. Diode I15, LED indicator I14, and current-limiting resistor I13 are connected in series and then in parallel with fuse I12.

[0018] Furthermore, the protection module II5 consists of fuse II16, current-limiting resistor II17, LED indicator II18, diode II19, branch fuse 20, and varistor 21. The drive power interface module 4 is connected to the input terminal of fuse II16, the output terminal of fuse II16 is connected to branch fuse 20, branch fuse 20 is connected to the drive input point of MOSFET switch 22, and varistor 21 is connected in parallel with the drive input / output terminal of MOSFET switch 22. Diode II19, LED indicator 18, and current-limiting resistor II17 are connected in series and then in parallel with fuse II16. This achieves multi-level safety protection.

[0019] Furthermore, the fast drive module 6 includes a MOSFET switch 22, a diode III 23, and a bleeder resistor 24. The drive input terminal of the MOSFET switch 22 is connected to the branch fuse 20, and the drive output terminal is connected to the input terminal of the current sampling module 7. The control input terminal of the MOSFET switch 22 is connected to the interface module 10. The diode III 23 and the bleeder resistor 24 are connected in series and then in parallel with the output interface module 8. This is used to realize the high-speed opening and fast closing of the solenoid valve.

[0020] Furthermore, the current feedback module 7 comprises a Hall effect transformer 25, resistor I 26, operational amplifier 27, capacitor I 28, resistor II 29, capacitor II 30, resistor III 31, and capacitor III 32. The input terminal of the Hall effect transformer 25 is connected to the drive output terminal of the MOSFET switch 22, and its output terminal is connected to the output interface module 8. The secondary winding output terminal of the Hall effect transformer 25 is connected to the operational amplifier 27 and in parallel with resistor I 26. The power input contact of the operational amplifier 27 is connected to the protection module 3. The power input point of the operational amplifier 27 is in parallel with capacitor II 30 and capacitor I 28. The secondary winding input terminal of the operational amplifier 27 is connected to the input terminal of resistor II 29, and its output terminal is connected to the signal output terminal of the operational amplifier 27. The signal output terminal of the operational amplifier 27 is connected in series with resistor III 31, then connected to capacitor III 32 and the current output interface module 11. This is used to realize real-time acquisition and feedback of the amplified and filtered current.

[0021] This invention discloses a solenoid valve rapid switching control and current sampling device. The sampling power interface module 1 connects to an external input power supply, providing power to the power input module 2. After voltage regulation, filtering, and stabilization, the power enters the protection module I3, which then provides ±15V power to the current sampling module 7. The current sampling module 7 receives a micro-current input via a Hall effect transformer 25 to an operational amplifier 27, which amplifies and filters it before connecting to the current output interface module 11. The drive power interface module 4 connects to the solenoid valve's DC 27V drive power supply. After passing through the protection module II5, it achieves multi-level safety protection. After passing through the branch fuse 20, it enters the rapid drive module 6, which consists of a MOSFET switch 22, a diode III 23, and a bleeder resistor 24. This module enables high-speed opening and rapid closing of the solenoid valve. The rapid on / off switch is activated by the MOSFET switch 22. The diode III 23 and the bleeder resistor 24 form a rapid freewheeling bleeder circuit. A varistor 21 is connected in parallel to the output of the MOSFET switch 22 to provide reverse voltage protection.

[0022] The present invention provides a method for a solenoid valve rapid switching control and current sampling device, comprising the following steps: The invention will be further explained below using the engine test bench data acquisition system and control system as an example: 1) Connect the sampling power interface module 1 to the external input power supply DC24V to provide power to the power input module 2. Connect the output terminal of the power input module 2 to the input terminal of fuse I12. After voltage regulation, filtering, and stabilization, the signal enters the protection module 3. Connect diode I15, LED indicator I14, and current limiting resistor I13 in series and then in parallel with fuse I12. Connect the output terminal of fuse I12 to the power input point of operational amplifier 27. After the current passes through the protection module I3, it provides ±15V power to the current sampling module 7. Then, after the micro current is input through Hall transformer 25 to operational amplifier 27, it is amplified and filtered before being connected to the current output interface module 11 to enter the engine test bench acquisition system. The engine test bench acquisition system collects the current signal to analyze the rapid opening and closing time of the solenoid valve. 2) Connect the drive power interface module 4 to the DC27V drive power supply of the solenoid valve. After passing through the branch fuse 20 of the protection module II 5, it enters the fast drive module 6. The fast on / off switch is operated by the MOSFET switch 22. The diode III 23 and the discharge resistor 24 form a fast freewheeling discharge circuit to achieve millisecond-level current decay and reduce turn-off delay. The varistor 21 is connected in parallel at the output terminal of the MOSFET switch 22 to provide reverse voltage protection for the MOSFET switch 22. After the output of the fast drive module 6, it enters the current feedback module 7, passes through the Hall transformer 25, and then enters the output interface module 8. After the output interface module 8, it enters the solenoid valve 9. 3) The rapid switching of solenoid valve 9 is controlled by the control interface module 10 receiving the switching control signal issued by the engine test bench control system in a time sequence, thereby controlling the switching action of the rapid drive module 6. The rapid switching of the rapid drive module 6 controls the opening or closing of solenoid valve 9. 4) The current output interface module 11 is connected to the acquisition channel of the engine test bench acquisition system to acquire the working current of the solenoid valve 9.

[0023] This invention employs a high-speed MOSFET and fast freewheeling discharge to achieve high-speed switching. It utilizes a high-precision Hall effect current transformer for sampling and amplification to achieve real-time current feedback. Combined with a 10A main circuit, a 2A branch circuit, and a 0.1A control circuit for tiered fuse protection, pluggable terminals, and a rail-mounted integrated installation structure, it is suitable for high-speed switching and precise current monitoring scenarios such as rocket engine hot-fire testing solenoid valve precision control, industrial automation, and hydraulic and pneumatic systems. This results in fast switching speed, accurate current acquisition, comprehensive protection, and convenient installation. It enables real-time and accurate current acquisition, multi-level safety protection, and rail-mounted integrated installation, improving the response speed, acquisition accuracy, and operational reliability of solenoid valve control.

Claims

1. A device for rapid switching control and current sampling of an electromagnetic valve, characterized in that, include: Power input module (2): Connects to an external DC24V power supply, which provides ±15V power to the current sampling module after voltage regulation, filtering and stabilization; Fast drive module (6): It consists of MOSFET switching transistor, drive chip and fast freewheeling discharge circuit, and receives signals to realize the high-speed opening and closing of the solenoid valve; Current sampling module (7): It uses a high-precision Hall current transformer for sampling, and after amplification and filtering, it is sent to the acquisition system to realize real-time current sampling and feedback; Protection module I (3) and protection module II (5): include a 10A main circuit, a 2A branch circuit and a 0.1A control circuit fuse, as well as overcurrent detection, overheat protection and reverse power connection protection; The interface module includes a sampling power interface module (1), a power interface module (4), a power output interface module (8), a control interface module (10), and a current output interface module (11); it adopts pluggable terminals.

2. The solenoid valve rapid switching control and current recovery device according to claim 1, characterized in that, The power input module (2) is connected to the sampling power interface module (1) at its input end and to the protection module I (3) at its output end. The output end of the protection module I (3) is connected to the input end of the current sampling module (7) to provide power to it. The fast drive module (6) is connected to the protection module II (5) and the control interface module (10) at its input end and to the input end of the current sampling module (7) at its output end. The protection module II (5) is connected to the drive power interface module (4) at its input end. The current sampling module (7) is connected to the power output interface module (8) and the current output interface module (11) at its output end. The power output interface module (8) is connected to the input end of the solenoid valve (9).

3. The solenoid valve rapid switching control and current sampling device according to claim 1, characterized in that... The protection module I (3) consists of a fuse I (12), a diode I (15), an LED indicator I (14), and a current-limiting resistor I (13).

4. The solenoid valve rapid switching control and current recovery device according to claim 1, characterized in that... The protection module II (5) consists of fuse II (16), current limiting resistor II (17), LED indicator II (18), diode II (19), branch fuse (20) and varistor (21).

5. The solenoid valve rapid switching control and current sampling device according to claim 1, characterized in that... The fast drive module (6) includes a MOSFET switch (22), a diode III (23) and a bleeder resistor (24). The drive input terminal of the MOSFET switch (22) is connected to the branch fuse (20), and the drive output terminal is connected to the input terminal of the current sampling module (7). The control input terminal of the MOSFET switch (22) is connected to the interface module (10). The diode III (23) and the bleeder resistor (24) are connected in series and then in parallel with the power output interface module (8).

6. The solenoid valve rapid switching control and current sampling device according to claim 1, characterized in that... The current sampling module (7) consists of a Hall transformer (25), resistor I (26), operational amplifier (27), capacitor I (28), resistor II (29), capacitor II (30), resistor III (31), and capacitor III (32). The input terminal of the Hall transformer (25) is connected to the drive output terminal of the MOSFET switch (22), and the output terminal is connected to the power output interface module (8). The secondary winding output terminal of the Hall transformer (25) is connected to the operational amplifier (27) and... The operational amplifier (27) is connected in parallel with resistor I (26), the power input contact of the operational amplifier (27) is connected to the protection module I (3), the power input point of the operational amplifier (27) is connected in parallel with capacitor II (30) and capacitor I (28), the secondary winding input terminal of the operational amplifier (27) is connected to the input terminal of resistor II (29), and the output terminal is connected to the signal output terminal of the operational amplifier (27). The signal output terminal of the operational amplifier (27) is connected in series with resistor III (31) and then connected to capacitor III (32) and current output interface module (11).

7. A method for using the electromagnetic valve rapid switching control and current sampling device as described in claim 1, characterized in that... Includes the following steps: The sampling power interface module (1) is connected to a DC24V power supply. The power input module (2) and protection module I (3) provide power to the current sampling module (7). The current sampling module (7) outputs the sampled current signal and enters the external acquisition system through the current output interface module (11). The drive power interface module (4) is connected to the DC27V drive power supply of the solenoid valve. After passing through the protection module II (5), the fast drive module (6), the current sampling module (7) and the power output interface module (8), it is connected to the solenoid valve (9). The fast switch of the solenoid valve (9) is controlled by the control interface module (10) receiving the control signal from the external control system and then controlling the fast drive module (6) to switch quickly. The fast switch of the fast drive module (6) controls the solenoid valve (9) to open or close.

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