Solenoid turn-off circuit and method

Abstract

The invention discloses a solenoid turn-off circuit and method, and belongs to the technical field of motion control. The first dissipation module is connected with the solenoid unit, and the first dissipation module is configured to communicate with the solenoid unit so as to perform primary dissipation on the current released by the solenoid unit; the dissipation bypass module is connected between the first dissipation module and the solenoid unit, and the dissipation bypass module is configured to perform secondary dissipation on the current released by the solenoid unit when the first dissipation module is disconnected from the spiral pipe unit; wherein the dissipation duration of the second-stage dissipation is smaller than that of the first-stage dissipation. According to the circuit provided by the invention, the current in the solenoid unit can be quickly dissipated through the dissipation bypass module, the time for turning off the solenoid is short, and the response speed and the real-time controllability of an equipment system are improved.

Description

Technical Field

[0001] The embodiments of this application relate to the field of motion control technology, and in particular to a solenoid turn-off circuit and method. Background Technology

[0002] Motion control systems are essential components of motion control equipment. They control the movement of equipment parts, such as the gas control of hydraulic retarders and the electro-hydraulic control of chassis suspensions. Components in a motion control system include, but are not limited to, electromagnetic loads, high-voltage side switches, and solenoids. By using a freewheeling diode in the control circuit to release the drive current stored in the solenoid load, a disabled state can be achieved, thus satisfying the motion control requirements of the equipment.

[0003] However, the currently used freewheeling dissipation circuits have a long turn-off time for the solenoid. Therefore, when the equipment needs to quickly switch operating states, the freewheeling dissipation circuit cannot quickly turn off the solenoid, resulting in slow system response and poor real-time control. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a solenoid turn-off circuit and method to solve the technical problems of long solenoid turn-off time and slow device response speed in the prior art.

[0005] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0006] In a first aspect, a solenoid turn-off circuit is provided, comprising:

[0007] Solenoid unit;

[0008] A first dissipation module is connected to the solenoid unit and is configured to communicate with the solenoid unit to dissipate the current released by the solenoid unit in a first stage.

[0009] A dissipation bypass module is connected between the first dissipation module and the solenoid unit. The dissipation bypass module is configured to dissipate the current released by the solenoid unit in a secondary manner when the first dissipation module is disconnected from the solenoid unit.

[0010] The dissipation duration of the secondary dissipation is less than that of the primary dissipation.

[0011] In conjunction with the first aspect, the dissipation bypass module includes a fourth Zener diode and a constant current source. The anode of the fourth Zener diode is connected to the solenoid unit, the cathode of the fourth Zener diode is connected to the positive terminal of the constant current source, and the negative terminal of the constant current source is grounded.

[0012] In conjunction with the first aspect, the solenoid unit includes an inductor and a third resistor, one end of the inductor is connected to the third resistor, and the other end of the inductor is connected to the anode of the fourth Zener diode.

[0013] In conjunction with the first aspect, the first dissipation module includes a third Zener diode, the anode of which is connected to the anode of the fourth Zener diode, and the cathode of which is connected to one end of the third resistor.

[0014] In conjunction with the first aspect, the solenoid turn-off circuit further includes a second switch module, which is connected between the dissipation bypass module and the first dissipation module. The second switch module is configured to control the connection state of the first dissipation module, the dissipation bypass module and the solenoid unit.

[0015] When the second switch module is closed, the first dissipation module is connected to the solenoid unit, and the current released by the solenoid unit flows to the first dissipation module, and the first dissipation module dissipates the current in the first stage.

[0016] When the second switch module is disconnected, the dissipation bypass module is connected to the solenoid unit, and the current released by the solenoid unit flows to the dissipation bypass module, which performs secondary dissipation on the current.

[0017] In conjunction with the first aspect, the second switching module includes a second MOSFET, the second MOSFET having a second switch input terminal, a second switch output terminal, and a second switch control terminal, the second switch input terminal being connected to the anode of the fourth Zener diode, the second switch output terminal being connected to the anode of the third Zener diode, and the second switch control terminal being connected to a second driver, the second driver being configured to generate a second drive signal to control the switching between the second switch input terminal and the second switch output terminal.

[0018] In conjunction with the first aspect, the solenoid turn-off circuit further includes a second dissipation module, which is connected to the solenoid unit and is configured to perform three-stage dissipation on the solenoid unit.

[0019] The second dissipation module includes a first Zener diode, a second Zener diode, a first capacitor, a second capacitor, and a first resistor. The anodes of the first Zener diode and the second Zener diode are connected to each other. The cathode of the first Zener diode is connected to the operating voltage. The cathode of the second Zener diode is connected to the cathode of the third Zener diode. One end of the parallel connection between the second capacitor and the first resistor is connected to the cathode of the second Zener diode. The other end of the parallel connection between the second capacitor and the first resistor is grounded. One end of the first capacitor is connected to the operating voltage, and the other end of the first capacitor is grounded.

[0020] In conjunction with the first aspect, the solenoid turn-off circuit further includes a first switch module, which is connected between the second dissipation module and the solenoid unit. The first switch module is configured to control the on / off state of the second dissipation module and the solenoid unit. When the first switch module connects the second dissipation module and the solenoid unit, the second dissipation module can perform three-stage dissipation on the solenoid unit.

[0021] In conjunction with the first aspect, the first switching module includes a first MOSFET, the first MOSFET having a first switch input terminal, a first switch output terminal and a first switch control terminal, the first switch input terminal being connected to the operating voltage, the first switch output terminal being connected to the cathode of the fourth Zener diode, and the first switch control terminal being connected to a first driver, the first driver being configured to generate a first drive signal to control the switching between the first switch input terminal and the first switch output terminal.

[0022] In conjunction with the first aspect, the solenoid turn-off circuit further includes a filtering module, which is connected between the second dissipation module and the first dissipation module. The filtering module includes a second resistor and a third capacitor. One end of the second resistor and the third capacitor connected in parallel is connected to the cathode of the third Zener diode, and the other end is grounded.

[0023] In a second aspect, a solenoid turn-off method is provided, applied to a solenoid turn-off circuit as described in any one of the first aspects, the method comprising:

[0024] In response to the connection between the solenoid unit and the first dissipation module, the current in the solenoid unit is dissipated in the first stage through the first dissipation module;

[0025] In response to the solenoid unit being disconnected from the first dissipation module, the current on the solenoid unit is transferred from the first dissipation module through the dissipation bypass module for secondary dissipation;

[0026] The dissipation duration of the secondary dissipation is less than that of the primary dissipation.

[0027] In conjunction with the second aspect, the method for dissipating current in the solenoid unit in a first stage through the first dissipation module in response to the connection of the solenoid unit with the first dissipation module includes:

[0028] A second drive signal is generated by a second driver;

[0029] The second drive signal is configured to control the second switch module to connect the first dissipation module to the solenoid unit, so as to dissipate the current in the solenoid unit in the first stage through the first dissipation module.

[0030] In conjunction with the second aspect, the method of transferring the current on the solenoid unit from the first dissipation module through a dissipation bypass module in response to the solenoid unit being disconnected from the first dissipation module for secondary dissipation includes:

[0031] A third drive signal is generated by the second driver;

[0032] The third drive signal is configured to control the second switch module to disconnect the first dissipation module from the solenoid unit, so as to transfer the current on the solenoid unit from the first dissipation module through the dissipation bypass module for secondary dissipation.

[0033] One of the above technical solutions has the following advantages or beneficial effects:

[0034] This application provides a solenoid turn-off circuit, including: a solenoid unit; a first dissipation module connected to the solenoid unit, configured to communicate with the solenoid unit to dissipate the current released by the solenoid unit in a first stage; and a dissipation bypass module connected between the first dissipation module and the solenoid unit, configured to dissipate the current released by the solenoid unit in a second stage when the first dissipation module is disconnected from the solenoid unit; wherein the dissipation time of the second stage dissipation is shorter than the dissipation time of the first stage dissipation. The circuit provided by this application can quickly dissipate the current in the solenoid unit through the dissipation bypass module, resulting in a short solenoid turn-off time. When the device needs to quickly switch operating states, the dissipation bypass circuit can quickly turn off the solenoid, thereby improving the response speed of the device system and thus improving the real-time controllability of the device.

[0035] This application also provides a solenoid turn-off method applied to a solenoid turn-off circuit. The method includes: responding to the connection of the solenoid unit with a first dissipation module, performing first-stage dissipation of the current in the solenoid unit through the first dissipation module; responding to the disconnection of the solenoid unit from the first dissipation module, transferring the current in the solenoid unit from the first dissipation module through a dissipation bypass module for second-stage dissipation; wherein the dissipation time of the second-stage dissipation is shorter than the dissipation time of the first-stage dissipation. The method provided by this application can quickly dissipate the current in the solenoid unit through the dissipation bypass module, resulting in a short solenoid turn-off time. When the equipment needs to quickly switch operating states, the dissipation bypass circuit can quickly turn off the solenoid, thereby improving the response speed of the equipment system and thus improving the real-time controllability of the equipment. Attached Figure Description

[0036] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0037] Figure 1 This is a schematic diagram of a solenoid turn-off circuit provided in an embodiment of this application;

[0038] Figure 2 A schematic diagram of primary and secondary dissipation curves provided for embodiments of this application;

[0039] Figure 3 A schematic diagram illustrating the steps of the solenoid shut-off method provided in this application embodiment.

[0040] The attached figures are labeled as follows:

[0041] 100 - Solenoid unit, 200 - Dissipation bypass module, 300 - First dissipation module, 400 - Second dissipation module, 500 - Filter module, 600 - First switch module, 700 - Second switch module. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. In the description of this application, it should be understood that 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, features defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0043] The specific implementation methods of this application are illustrated below through examples:

[0044] like Figure 1As shown, this application embodiment provides a solenoid turn-off circuit, including: a solenoid unit 100; a first dissipation module 300 connected to the solenoid unit 100, configured to communicate with the solenoid unit to dissipate the current released by the solenoid unit 100 in a first stage; and a dissipation bypass module 200 connected between the first dissipation module 300 and the solenoid unit 100, configured to dissipate the current released by the solenoid unit 100 in a second stage when the first dissipation module 300 is disconnected from the solenoid unit 100; wherein the dissipation time of the second stage dissipation is less than the dissipation time of the first stage dissipation. Specifically, the solenoid unit 100 includes a solenoid (also called a relay), which is an electromagnetic device composed of a coil and a magnetic core. Solenoids are mainly used for controlling the switching and regulation of current, converting small currents or control signals into large currents or high-power signals. When current flows through the coil, the solenoid generates a magnetic field, magnetizing the core. This magnetization attracts or releases a mechanical switch (such as a contact) connected to the solenoid, thus opening or closing the circuit. When a control current flows through the solenoid's coil, the magnetic field generates and attracts the mechanical switch, closing it. When the control current stops flowing, the magnetic field disappears, and the mechanical switch opens. Solenoids can be controlled by direct current (DC) or alternating current (AC). In DC control, the solenoid's switching state is controlled by the on / off state of the control current. In AC control, the solenoid's switching state is controlled by the periodic changes in the AC power supply. Furthermore, solenoids can achieve different control logics through different contact configurations and coil arrangements. For example, single-pole single-throw (SPS) and double-pole double-throw (DPPS) contact configurations can achieve different switching functions. Parameters such as coil polarity and voltage can also be adjusted according to specific applications.

[0045] like Figure 2 As shown in this embodiment, the solenoid unit 100 is a device that stores drive current and needs to be turned off at a specific time. A first dissipation module 300 is connected to the solenoid unit 100 and is configured to perform primary dissipation of the current released by the solenoid unit 100. That is, the first dissipation module 300 can quickly release the drive current in the solenoid unit 100 to achieve turn-off. A dissipation bypass module 200 is connected between the first dissipation module 300 and the solenoid unit 100 and is configured to perform secondary dissipation of the current released by the solenoid unit 100. The dissipation time of the secondary dissipation is shorter than that of the primary dissipation, meaning that the dissipation bypass module 200 can dissipate the current in the solenoid unit 100 more quickly. Figure 2 As shown, the time taken for the secondary dissipation to dissipate current from the release of current is 1ms, while the time taken for the primary dissipation to dissipate current from the release of current is close to 30ms. Therefore, the dissipation time of the secondary dissipation is actually much shorter than that of the primary dissipation.

[0046] Understandably, the dissipation bypass module 200 enables rapid dissipation of the drive current in the solenoid unit 100. This meets strict time constraints and allows for rapid switching of operating states. The dissipation bypass module 200 also effectively protects the solenoid unit 100 and other related components, preventing damage to the system from excessive current by rapidly dissipating the released current. Furthermore, this solution allows for different dissipation durations and capabilities by adjusting the parameters of the first dissipation module 300 and the dissipation bypass module 200, adapting to different application scenarios and requirements. The use of a two-stage dissipation design improves system reliability. Even if the first dissipation module 300 fails, the second dissipation module 400 can still provide protection, ensuring the safe shutdown of the solenoid unit 100.

[0047] In this embodiment, the dissipation bypass module 200 includes a fourth Zener diode D4 and a constant current source Y. The anode of the fourth Zener diode D4 is connected to the solenoid unit 100, the cathode of the fourth Zener diode D4 is connected to the anode of the constant current source Y, and the cathode of the constant current source Y is grounded. Specifically, when the solenoid unit 100 releases current, the current is transferred along the anode of the fourth Zener diode D4 to the constant current source Y. The constant current source Y absorbs the energy generated by the reverse electromotive force through its own regulation, thereby enabling the constant current source Y to dissipate the current. At the same time, the fourth Zener diode D4 also isolates the constant current source Y, preventing the current in the constant current source Y from flowing to the solenoid unit 100, thus preventing the current in the solenoid unit 100 from being dissipated. The constant current source Y can also provide a constant current, ensuring that the current in the solenoid unit 100 remains constant during the dissipation process.

[0048] Understandably, by using the fourth Zener diode D4 and the constant current source Y, the stability of the current during dissipation can be ensured, which helps protect the solenoid unit 100 and other related components, preventing damage caused by excessive current. Furthermore, the constant current source Y absorbs the energy generated by the back electromotive force in the solenoid unit 100 through its own regulation, enabling the current in the solenoid unit 100 to dissipate rapidly, thereby achieving rapid switching of operating states.

[0049] In this embodiment, the solenoid unit 100 includes an inductor L and a third resistor R3. One end of the inductor L is connected to the third resistor R3, and the other end of the inductor L is connected to the anode of a fourth Zener diode D4. Specifically, in the solenoid unit 100, the inductor L stores the drive current and generates a magnetic field to release the current when needed. The third resistor R3 is used to limit the current in the inductor L, thereby controlling the current magnitude to meet system requirements. By adjusting the resistance value of the third resistor R3, the release rate of the current in the solenoid unit 100 can be controlled. When current dissipation is required, the current in the inductor L flows out through the anode of the fourth Zener diode D4 and enters the dissipation bypass module 200 for dissipation.

[0050] Understandably, by adjusting the value of the third resistor R3, the release rate of current in the solenoid unit 100 can be precisely controlled, thereby meeting the current control requirements in specific application scenarios. The inductor L can store current and generate a magnetic field, releasing current when needed, thus providing more stable and reliable current control. By using the combination of inductor L and the third resistor R3, the stability of the system can be improved.

[0051] In this embodiment, the first dissipation module 300 includes a third Zener diode D3. The anode of the third Zener diode D3 is connected to the anode of a fourth Zener diode D4, and the cathode of the third Zener diode D3 is connected to one end of a third resistor R3. Specifically, the first dissipation module 300 includes a third Zener diode D3, which is a Zener diode. The Zener diode is used to quickly dissipate the drive current released from the solenoid unit 100, thereby quickly turning off the components in the solenoid unit 100 and quickly disconnecting the actuator from the hydraulic circuit in the device. A Zener diode is a special type of diode with voltage regulation characteristics. By using the third Zener diode D3 as a Zener diode, a stable voltage can be provided, thereby ensuring voltage stability during current dissipation. This helps protect the solenoid unit 100 and other related components from damage caused by excessively high or low voltage.

[0052] Understandably, the first dissipation module 300 achieves stable dissipation and protection of current and voltage in the solenoid unit 100 by using a Zener diode. Zener diodes offer advantages such as voltage stability, voltage protection, and system stability, making them suitable for applications requiring stable dissipation and protection of current and voltage in the solenoid unit 100.

[0053] In this embodiment, the solenoid turn-off circuit further includes a second switch module 700, which is connected between the dissipation bypass module 200 and the first dissipation module 300. The second switch module 700 is configured to control the connection state of the first dissipation module 300, the dissipation bypass module 200, and the solenoid unit 100. When the second switch module 700 is closed, the first dissipation module 300 is connected to the solenoid unit 100, and the current released by the solenoid unit 100 flows to the first dissipation module 300, which performs first-stage dissipation of the current. When the second switch module 700 is open, the dissipation bypass module 200 is connected to the solenoid unit 100, and the current released by the solenoid unit 100 flows to the dissipation bypass module 200, which performs second-stage dissipation of the current. Specifically, the connection state of the solenoid unit 100 can be flexibly switched by controlling the on / off state of the second switch module 700. In primary dissipation, the current dissipation speed of solenoid unit 100 is slow, and the time required is long; while in secondary dissipation, the current dissipation speed of solenoid unit 100 is fast, and the time required is short. When the scenario in which the device is located requires primary dissipation, the second switch module 700 can be controlled to close, thereby guiding the current to the first dissipation module 300 for primary dissipation of the current in solenoid unit 100; when the scenario in which the device is located requires secondary dissipation, the second switch module 700 can be controlled to open, thereby guiding the current to the dissipation bypass module 200 for secondary dissipation of the current in solenoid unit 100.

[0054] Understandably, by using the first dissipation module 300 and the dissipation bypass module 200, the current released by the solenoid unit 100 can be dissipated in two stages, thus meeting the needs of different application scenarios. By controlling the second switch module 700, the current can be guided to the first dissipation module 300 when needed, thereby protecting the solenoid unit 100. When a higher level of dissipation is required, the current can be guided to the dissipation bypass module 200 to further improve the protection performance.

[0055] In this embodiment, the second switch module 700 includes a second MOSFET Q2. The second MOSFET Q2 has a second switch input terminal, a second switch output terminal, and a second switch control terminal. The second switch input terminal is connected to the anode of a fourth Zener diode D4, and the second switch output terminal is connected to the anode of a third Zener diode D3. The second switch control terminal is connected to a second driver S2, which is configured to generate a second drive signal to control the on / off state between the second switch input terminal and the second switch output terminal. Specifically, the second MOSFET Q2 has a drain (second switch input terminal), a source (second switch output terminal), and a gate (second switch control terminal). The gate of the second MOSFET Q2 is connected to the second driver S2 to receive the second drive signal. When the second drive signal is high, the source and drain of the second MOSFET Q2 are turned on; when the second drive signal is low, the source and drain of the second MOSFET Q2 are turned off. The second drive signal generated by the second driver S2 is a PWM (Pulse Width Modulation) signal, used to control the on / off state of the second switch module 700. The characteristic of PWM signals is that they control the on / off time ratio of switches by adjusting the pulse width, thereby achieving precise control of the circuit.

[0056] It is understandable that precise control of the circuit can be achieved by using a PWM signal to control the on / off state of the second switching module 700. The pulse width of the PWM signal can be adjusted as needed to precisely control the switching time ratio of the second switching module 700, thereby controlling the connection state of the solenoid unit 100. Furthermore, MOSFETs have the characteristics of fast switching speed and low switching losses. Therefore, the second MOSFET Q2, as the second switching module 700, can provide reliable switching control, thereby ensuring the reliable and stable connection state of the solenoid unit 100.

[0057] In this embodiment, the solenoid turn-off circuit further includes a second dissipation module 400, which is connected to the solenoid unit 100. The second dissipation module 400 is configured to dissipate the solenoid unit 100 in three stages. The second dissipation module 400 includes a first Zener diode D1, a second Zener diode D2, a first capacitor C1, a second capacitor C2, and a first resistor R1. The anodes of the first Zener diode D1 and the second Zener diode D2 are connected to each other. The cathode of the first Zener diode D1 is connected to the operating voltage. The cathode of the second Zener diode D2 is connected to the cathode of the third Zener diode D3. One end of the parallel connection of the second capacitor C2 and the first resistor R1 is connected to the cathode of the second Zener diode D2. The other end of the parallel connection of the second capacitor C2 and the first resistor R1 is grounded. One end of the first capacitor C1 is connected to the operating voltage, and the other end of the first capacitor C1 is grounded. Specifically, the cathode of the first Zener diode D1 is connected to the operating voltage, and the cathode of the second Zener diode D2 is connected to the cathode of the third Zener diode D3. Both the first Zener diode D1 and the second Zener diode D2 can be used to stabilize the operating voltage, ensuring voltage stability during normal operation of the second dissipation module 400. One end of the first capacitor C1 is connected to the operating voltage, and the other end is grounded. It is used to store charge and smooth the voltage, helping to provide a stable voltage output. One end of the second capacitor C2 and the first resistor R1 connected in parallel is connected to the cathode of the second Zener diode D2, and the other end is grounded. Their combination forms a low-pass filter, used to smooth voltage fluctuations and filter out high-frequency noise.

[0058] Understandably, by using the second dissipation module 400, tri-stage dissipation can be achieved in the solenoid unit 100, thereby helping to control and disperse the current in the solenoid unit 100 and preventing damage to the solenoid unit 100 due to excessive current. By using a Zener diode and capacitor, the operating voltage can be stabilized and voltage fluctuations smoothed. This helps ensure the normal operation of the second dissipation module 400 and improves the stability of the entire solenoid turn-off circuit.

[0059] In this embodiment, the solenoid turn-off circuit further includes a first switch module 600, which is connected between the second dissipation module 400 and the solenoid unit 100. The first switch module 600 is configured to control the on / off state of the second dissipation module 400 and the solenoid unit 100. When the first switch module 600 connects the second dissipation module 400 to the solenoid unit 100, the second dissipation module 400 can perform three-stage dissipation on the solenoid unit 100. Specifically, by controlling the on / off state of the first switch module 600, the connection and disconnection between the second dissipation module 400 and the solenoid unit 100 are controlled, thereby controlling whether the second dissipation module 400 performs three-stage dissipation on the solenoid unit 100.

[0060] Understandably, by controlling the on / off state of the first switch module 600, the on / off state of the second dissipation module 400 and the solenoid unit 100 can be flexibly controlled as needed. This makes the solenoid shut-off circuit adjustable and operable according to actual requirements.

[0061] In this embodiment, the first switch module 600 includes a first MOSFET Q1. The first MOSFET Q1 has a first switch input terminal, a first switch output terminal, and a first switch control terminal. The first switch input terminal is connected to an operating voltage. The first switch output terminal is connected to the cathode of a fourth Zener diode D4. The first switch control terminal is connected to a first driver S1, which is configured to generate a first drive signal to control the switching between the first switch input terminal and the first switch output terminal. Specifically, the first MOSFET Q1 is a metal-oxide-semiconductor field-effect transistor (MOSFET) used as a switch. Its on / off state is controlled by the first driver S1. The first driver S1 is configured to generate a first drive signal, i.e., a PWM signal, to control the on / off state of the first MOSFET Q1. When the PWM signal is high, the first MOSFET is on, allowing current to flow; when the PWM signal is low, the first MOSFET is off, blocking current. The fourth Zener diode D4 is connected to the first switch output terminal to stabilize the output voltage.

[0062] Understandably, by generating a PWM signal through the first driver S1 to control the on / off state of the first MOSFET Q1, precise control of the solenoid turn-off circuit can be achieved. The duty cycle of the PWM signal can be adjusted, thereby controlling the on / off time ratio and achieving precise circuit control. MOSFETs have the characteristics of fast switching speed and low switching losses, providing reliable switching function and thus improving the reliability of the entire circuit.

[0063] In this embodiment, the solenoid turn-off circuit further includes a filter module 500. The filter module 500 is connected between the second dissipation module 400 and the first dissipation module 300. The filter module 500 includes a second resistor R2 and a third capacitor C3. One end of the parallel connection of the second resistor R2 and the third capacitor C3 is connected to the cathode of the third Zener diode D3, and the other end is grounded. Specifically, the parallel connection of the second resistor R2 and the third capacitor C3 forms a low-pass filter. The function of this low-pass filter is to limit the current flow to the filter module 500, smooth current fluctuations, and provide a stable current output. The third Zener diode D3 is connected to one end of the filter module 500 to stabilize the output voltage. The cathode of the third Zener diode D3 is connected to the filter module 500 and provides a stable voltage to other parts or loads.

[0064] It is understandable that the combination of the second resistor R2 and the third capacitor C3 forms a low-pass filter. This filter can smooth current and voltage fluctuations, filter out high-frequency noise, and provide stable current and voltage output. The presence of the third Zener diode D3 provides a stable output voltage, increasing the stability of the entire circuit.

[0065] In summary, the solenoid turn-off circuit provided in this application, by controlling the second switching module 700 to output a low-level PWM signal, can disconnect the first dissipation module 300 from the solenoid unit 100, thereby connecting the constant current source Y in the dissipation bypass module 200 to the solenoid unit 100. The constant current source Y can provide high-precision current output and has a fast response capability. By controlling the output of the constant current source Y, the solenoid unit 100 can be quickly turned off, thereby shortening the device's turn-off time and improving the device's response speed and efficiency. The first switching module 600 is controlled by a PWM signal, connecting the second dissipation module 400 to the solenoid unit 100, thereby dissipating energy in the solenoid unit 100. By adjusting the duty cycle of the PWM signal, the conduction time of the first switching module 600 can be controlled, thereby reducing energy loss and power consumption. The filter module 500 provides stable current and voltage output; through low-pass filtering and voltage regulation, current and voltage fluctuations can be reduced, maintaining a stable operating state.

[0066] like Figure 3 As shown, this application provides a solenoid turn-off method applied to a solenoid turn-off circuit. The method includes:

[0067] S1: Current is supplied to solenoid unit 100, which has an enable mode and a disable mode.

[0068] Specifically, current is supplied to the solenoid unit 100, and different levels of dissipation are performed depending on the enabled and disabled modes. It is understood that the solenoid unit 100 can switch between enabled and disabled modes as needed. In disabled mode, the solenoid unit 100 performs primary dissipation, suitable for lower power or shorter operation times. In enabled mode, the solenoid unit 100 performs secondary dissipation, suitable for higher power or longer operation times.

[0069] S2: In response to the solenoid unit 100 calling the disabled mode, the solenoid unit 100 is connected to the first dissipation module 300, and the current in the solenoid unit 100 is dissipated in the first stage through the first dissipation module 300.

[0070] The specific method steps include: generating a second drive signal through a second driver S2; the second drive signal is configured to control the second switching module 700 to connect the first dissipation module 300 to the solenoid unit 100, so as to dissipate the current in the solenoid unit 100 through the first dissipation module 300. The second drive signal generated by the second driver S2 is a PWM signal, and the on / off state of the second switching module 700 is controlled by adjusting the high and low levels of the PWM signal. The characteristic of the PWM signal is that it controls the on / off time ratio of the switch by adjusting the pulse width, thereby achieving precise control of the circuit. The second switching module 700 includes a second MOSFET Q2, which has a drain, a source, and a gate. The gate of the second MOSFET Q2 is connected to the second driver S2 to receive the second drive signal. When the second drive signal is high, the source and drain of the second MOSFET Q2 are turned on, thereby achieving first-stage dissipation of the current in the solenoid unit 100 through the first dissipation module 300.

[0071] S3: In response to the solenoid unit 100 calling the enable mode, the solenoid unit 100 is disconnected from the first dissipation module 300, and the current on the solenoid unit 100 is transferred from the first dissipation module 300 through the dissipation bypass module 200 for secondary dissipation; wherein, the dissipation time of the secondary dissipation is less than the dissipation time of the primary dissipation.

[0072] The specific method steps include: generating a second drive signal through a second driver; the second drive signal is configured to control the second switching module 700 to disconnect the first dissipation module 300 from the solenoid unit 100, so that the current on the solenoid unit 100 is transferred from the first dissipation module 300 through the dissipation bypass module 200 for secondary dissipation. When the second drive signal generated by the second driver S2 is low, the source and drain of the second MOS transistor Q2 are disconnected. At this time, the dissipation bypass module 200 is connected to the solenoid unit 100, and the dissipation bypass module 200 transfers the current on the solenoid unit 100 from the first dissipation module 300 for secondary dissipation. Since the dissipation time of the secondary dissipation is shorter than that of the primary dissipation, the dissipation bypass module 200 can quickly dissipate the current released by the solenoid unit 100, thereby shortening the device turn-off time and improving the device's response speed and efficiency.

[0073] The foregoing has provided a detailed description of a solenoid turn-off circuit and method according to the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. 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. 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 application.

Claims

1. A solenoid turn-off circuit, characterized in that, include: Solenoid unit; A first dissipation module is connected to the solenoid unit and is configured to communicate with the solenoid unit to dissipate the current released by the solenoid unit in a first stage. A dissipation bypass module is connected between the first dissipation module and the solenoid unit. The dissipation bypass module is configured to dissipate the current released by the solenoid unit in a secondary manner when the first dissipation module is disconnected from the solenoid unit. The dissipation duration of the secondary dissipation is less than that of the primary dissipation.

2. The solenoid turn-off circuit as described in claim 1, characterized in that, The dissipation bypass module includes a fourth Zener diode and a constant current source. The anode of the fourth Zener diode is connected to the solenoid unit, the cathode of the fourth Zener diode is connected to the positive terminal of the constant current source, and the negative terminal of the constant current source is grounded.

3. The solenoid turn-off circuit as described in claim 2, characterized in that, The solenoid unit includes an inductor and a third resistor. One end of the inductor is connected to the third resistor, and the other end of the inductor is connected to the anode of the fourth Zener diode.

4. The solenoid turn-off circuit as described in claim 3, characterized in that, The first dissipation module includes a third Zener diode, the anode of which is connected to the anode of the fourth Zener diode, and the cathode of which is connected to one end of the third resistor.

5. The solenoid turn-off circuit as described in claim 4, characterized in that, The solenoid turn-off circuit further includes a second switch module, which is connected between the dissipation bypass module and the first dissipation module. The second switch module is configured to control the connection state of the first dissipation module, the dissipation bypass module and the solenoid unit. When the second switch module is closed, the first dissipation module is connected to the solenoid unit, and the current released by the solenoid unit flows to the first dissipation module, which dissipates the current in the first stage. When the second switch module is disconnected, the dissipation bypass module is connected to the solenoid unit, and the current released by the solenoid unit flows to the dissipation bypass module, which performs secondary dissipation on the current.

6. The solenoid turn-off circuit as described in claim 5, characterized in that, The second switching module includes a second MOSFET, which has a second switch input terminal, a second switch output terminal, and a second switch control terminal. The second switch input terminal is connected to the anode of the fourth Zener diode, and the second switch output terminal is connected to the anode of the third Zener diode. The second switch control terminal is connected to a second driver, which is configured to generate a second drive signal to control the switching between the second switch input terminal and the second switch output terminal.

7. The solenoid turn-off circuit as described in claim 4, characterized in that, The solenoid turn-off circuit further includes a second dissipation module, which is connected to the solenoid unit and is configured to perform three-stage dissipation on the solenoid unit. The second dissipation module includes a first Zener diode, a second Zener diode, a first capacitor, a second capacitor, and a first resistor. The anodes of the first Zener diode and the second Zener diode are connected to each other. The cathode of the first Zener diode is connected to the operating voltage. The cathode of the second Zener diode is connected to the cathode of the third Zener diode. One end of the parallel connection between the second capacitor and the first resistor is connected to the cathode of the second Zener diode. The other end of the parallel connection between the second capacitor and the first resistor is grounded. One end of the first capacitor is connected to the operating voltage, and the other end of the first capacitor is grounded.

8. The solenoid turn-off circuit as described in claim 7, characterized in that, The solenoid turn-off circuit further includes a first switch module, which is connected between the second dissipation module and the solenoid unit. The first switch module is configured to control the on / off state of the second dissipation module and the solenoid unit. When the first switch module connects the second dissipation module and the solenoid unit, the second dissipation module can perform three-stage dissipation on the solenoid unit.

9. The solenoid turn-off circuit as described in claim 8, characterized in that, The first switching module includes a first MOSFET, which has a first switch input terminal, a first switch output terminal, and a first switch control terminal. The first switch input terminal is connected to the operating voltage, the first switch output terminal is connected to the cathode of the fourth Zener diode, and the first switch control terminal is connected to a first driver. The first driver is configured to generate a first drive signal to control the switching between the first switch input terminal and the first switch output terminal.

10. The solenoid turn-off circuit as described in claim 7, characterized in that, The solenoid turn-off circuit also includes a filtering module, which is connected between the second dissipation module and the first dissipation module. The filtering module includes a second resistor and a third capacitor. One end of the second resistor and the third capacitor connected in parallel is connected to the cathode of the third Zener diode, and the other end is grounded.

11. A solenoid turn-off method, applied to the solenoid turn-off circuit as described in any one of claims 1-10, characterized in that, The method includes: In response to the connection between the solenoid unit and the first dissipation module, the current in the solenoid unit is dissipated in the first stage through the first dissipation module; In response to the solenoid unit being disconnected from the first dissipation module, the current on the solenoid unit is transferred from the first dissipation module through the dissipation bypass module for secondary dissipation; The dissipation duration of the secondary dissipation is less than that of the primary dissipation.

12. The solenoid shut-off method as described in claim 11, characterized in that, The method for dissipating current in the solenoid unit in a first stage through the first dissipation module in response to the connection of the solenoid unit with the first dissipation module includes: A second drive signal is generated by a second driver; The second drive signal is configured to control the second switch module to connect the first dissipation module to the solenoid unit, so as to dissipate the current in the solenoid unit in the first stage through the first dissipation module.

13. The solenoid shut-off method as described in claim 11, characterized in that, The method of transferring the current on the solenoid unit from the first dissipation module through a dissipation bypass module in response to the solenoid unit being disconnected from the first dissipation module for secondary dissipation includes: A third drive signal is generated by the second driver; The third drive signal is configured to control the second switch module to disconnect the first dissipation module from the solenoid unit, so as to transfer the current on the solenoid unit from the first dissipation module through the dissipation bypass module for secondary dissipation.

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