Current change control device

Abstract

The utility model relates to the technical field of current change control, and provides a current change control device, which realizes stable rising of current, avoids generation of dangerous voltage and ensures safety of equipment and personnel through cooperative work of a post-stage large current conversion circuit, a control module and an output current detection module. The rear-stage large-current conversion circuit converts the higher direct-current voltage into the required lower direct-current voltage, and the control module performs high-precision current detection through a Hall current sensor and monitors and adjusts the rising time of the current in real time so as to realize closed-loop feedback control; through the man-machine interaction module, a user can flexibly set current rising and falling time according to requirements; the working time can be shortened, and the working efficiency can be improved; according to the invention, extra risks caused by disconnection of a bus differential protection current loop can be reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of current change control, in particular to a current change control device. Background Art

[0002] Currently, testing the conductive loop resistance of circuit breakers in GIS combined electrical equipment requires a current of at least 100A to flow through the entire loop (Southern Power Grid standards stipulate that the applied current for measuring conductive loop resistance must be no less than 100A). Due to the special nature of GIS combined electrical equipment, the test loop also includes a current transformer.

[0003] For example, in a 220kV tank circuit breaker and a 500kV 3 / 2 wiring configuration, current transformers are typically connected to busbar differential protection devices. If the three-phase differential current reaches the busbar differential protection pickup value during testing, all outgoing line bays on the entire busbar section will trip, causing serious equipment failure and safety hazards.

[0004] When measuring large currents (above 100A), if the primary current suddenly changes from 0A to 100A after being loaded into the primary circuit, high voltage induction will be generated on the secondary side, seriously affecting the secondary circuit system and, in particular, causing malfunction of the busbar differential protection.

[0005] Based on this, the utility model proposes a current change control device to make the current rise smoothly to avoid generating dangerous voltage and ensure the safety of equipment and personnel. Utility Model Content

[0006] The purpose of the utility model is to solve the deficiencies of the prior art and provide a current change control device to make the current rise smoothly to avoid generating dangerous voltage and ensure the safety of equipment and personnel.

[0007] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A current change control device includes: a subsequent high-current conversion circuit, a control module, and an output current detection module. The subsequent high-current conversion circuit input is electrically connected to the output of a high-current emitting device, and the subsequent high-current conversion circuit output is electrically connected to the current inlet and outlet of a subsequent device. The subsequent high-current conversion circuit is used to convert a higher DC voltage into a lower DC voltage.

[0009] The latter high current conversion circuit is electrically connected to a control module, and the control module controls the current rise time of the output terminal of the latter high current conversion circuit so that the current of the output terminal of the latter high current conversion circuit rises or falls smoothly;

[0010] The output current detection module is electrically connected to the control module. The output current detection module is used to collect the current signal at the output end of the subsequent high-current conversion circuit and output the current signal to the control module. The control module adjusts the current rise time at the output end of the subsequent high-current conversion circuit in real time according to the current signal, forming a closed-loop feedback system, thereby ensuring that the current at the output end of the subsequent high-current conversion circuit rises or falls smoothly.

[0011] Preferably, the post-stage high-current conversion circuit includes: a buck step-down circuit and a MOS transistor electrode drive circuit; the buck step-down circuit converts a higher DC voltage into a lower DC voltage within a certain period of time through a combination of switching elements, diodes, inductors, and capacitors; the MOS transistor electrode drive circuit amplifies the PWM control signal generated by the control module and drives the MOS transistor to turn on or off.

[0012] Preferably, the buck circuit includes: a plurality of capacitors, MOS transistors Q1 and Q2, a diode D7, an inductor U5, and connection terminals U8 and U9. The plurality of capacitors are connected in parallel between the input terminal VCC and the ground terminal GND, and between the output terminal IOUT and the ground terminal GND of the buck circuit. The MOS transistor Q1 is connected in series with the input terminal VCC, and a MOS transistor Q2 is connected in parallel across both ends of the MOS transistor Q1. A resistor R24 ​​and a capacitor C55 are also connected in parallel across both ends of the MOS transistor Q1. The D poles of the MOS transistors Q1 and Q2 are connected to the input terminal VCC, the S poles are connected to the output terminal IOUT, and the G poles are connected to the MOS transistor electrode drive circuit outputs G1 and G2, respectively. The S poles of the MOS transistors Q1 and Q2 are connected to the cathode of the diode D7, the anode of the diode D7 is grounded, the S poles of the MOS transistors Q1 and Q2 are connected to the VS terminal, and an inductor U5 is connected in series between the VS terminals. The connection terminal U8 is connected to a VCC voltage divider detection circuit, and a signal from the VCC voltage divider detection circuit is output to the control module after analog-to-digital conversion.

[0013] Preferably, the MOS transistor drive circuit includes: a DC-DC boost conversion circuit and a PWM control signal amplification circuit; the DC-DC boost conversion circuit includes: an isolated DC_DC chip M3, inductors L7 and L8, capacitors C29, capacitor C31, and capacitor C32; one end of the inductor L7 is connected to the power supply 12V and the other end is connected to pin 2 of the isolated DC_DC chip M3, and both ends of the inductor L7 are respectively connected to ground via capacitors C31 and C32; pin 1 of the isolated DC_DC chip M3 is grounded, pin 3 of the isolated DC_DC chip M3 is connected to one end of the inductor L8, and the other end of the inductor L8 is connected to 12VA, pin 5 of the isolated DC_DC chip M3 is connected to VS, and C29 is connected between VS and 12VA;

[0014] The PWM control signal amplification circuit includes: a photoelectric coupler U1, resistors R1, R2, R9, R10, R12, and Zener diodes D3 and D6; pin 1 of the photoelectric coupler U1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the PWM signal output by the control module, pins 4 and 6 of the photoelectric coupler U1 are connected to VS and 12VA respectively, and pin 5 of the photoelectric coupler U1 outputs two branches, namely G1 and G2, and resistors R2 and R9 are connected in series with G1 and G2 respectively; G1 and VS are connected through a parallel resistor R12 and a Zener diode D6; G2 and VS are connected through a parallel resistor R10 and a Zener diode D3.

[0015] Preferably, the control module adopts an STM32F301K8T6 single-chip microcomputer as the main control, and controls the single-chip microcomputer to output a PWM signal from a PWM pin. The signal is loaded into the BUCK step-down circuit through the MOS tube drive circuit to control the operation of the BUCK step-down circuit.

[0016] Preferably, the control module is mainly connected to a crystal oscillator circuit, a debugging circuit, and a decoupling circuit.

[0017] Preferably, the output current detection module is a Hall current sensor.

[0018] Preferably, the current signal at the output end of the subsequent high current conversion circuit collected by the Hall current sensor is subjected to voltage division and filtering, and then analog-to-digital conversion is input into the control module.

[0019] Preferably, the control module is connected to a human-computer interaction module, and the human-computer interaction module is used to set the current rise and fall time parameters.

[0020] The utility model discloses a current change control device having the following beneficial effects.

[0021] Improved safety: By controlling the smooth rise of current, high voltage induction caused by current mutation is avoided, effectively reducing interference with the secondary circuit system, thereby significantly reducing the risk of false operation and failure of bus differential protection, ensuring the safety of equipment and operators, reducing working time and improving work efficiency; and reducing the additional risks brought about by disconnecting and connecting the bus differential protection current loop.

[0022] Closed-loop feedback system: This device uses a closed-loop feedback mechanism to detect and adjust the output current in real time to ensure the stability of current changes. This makes the rise and fall of current more controllable and improves the reliability of the test process.

[0023] Flexibility and Adjustability: The control module is equipped with a human-machine interface, allowing users to flexibly set the current rise and fall times according to actual needs. This allows the device to adapt to different testing requirements and expand its application range.

[0024] Efficient voltage conversion: The post-stage high current conversion circuit can effectively convert the higher DC voltage into the required lower DC voltage, ensuring the stability of the current output.

[0025] High-precision current detection: Using Hall current sensors for current detection can achieve high-precision current monitoring, improve the system's response speed and accuracy to current changes, and further enhance the reliability of the equipment.

[0026] Reduce maintenance costs: By reducing failures and malfunctions caused by sudden current changes, the frequency and cost of equipment maintenance are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a system block diagram of the current change control device of the present utility model.

[0028] Figure 2 This is the principle diagram of the BUCK step-down circuit of the utility model.

[0029] Figure 3 This is a schematic diagram of the MOS tube drive circuit of the utility model.

[0030] Figure 4 This is the circuit principle diagram of the control module of the present utility model.

[0031] Figure 5 This is the principle diagram of the voltage divider and filtering circuit of the utility model.

[0032] Figure 6 This is the principle diagram of the VCC voltage divider detection circuit of the present utility model.

[0033] In the attached figure: 1. Post-stage high-current conversion circuit; 11. BUCK step-down circuit; 12. MOS tube drive circuit; 2. Control module; 3. Output current detection module; 4. Voltage divider and filter circuit; 5. Human-computer interaction module; 6. High-current emission device; 7. Subsequent equipment. DETAILED DESCRIPTION

[0034] In order to explain in detail the possible application scenarios, technical principles, specific solutions that can be implemented, and the purpose and effects of this application, the following is a detailed description of the specific embodiments listed in conjunction with the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of this application and are therefore only examples and are not intended to limit the scope of protection of this application.

[0035] References to "embodiments" herein mean that the specific features, structures, or characteristics described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the word "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or relevance to other embodiments. In principle, in this application, as long as there are no technical contradictions or conflicts, the various technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable technical solution.

[0036] Unless otherwise defined, the technical terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms herein is only for describing specific embodiments and is not intended to limit this application.

[0037] In the description of this application, the term "and / or" is used to describe a logical relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A exists, B exists, and both A and B exist. In addition, the character " / " in this document generally indicates that the objects before and after are in a logical "or" relationship.

[0038] Without further limitations, in this application, the words "include", "comprise", "have" or other similar expressions used in the sentences are intended to cover non-exclusive inclusion. These expressions do not exclude the presence of additional elements in the process, method or product including the elements, so that the process, method or product including a series of elements may include not only those defined elements, but also other elements not explicitly listed, or elements inherent to such process, method or product.

[0039] Unless otherwise expressly specified or limited, in the description of the embodiments of the present application, the terms "installed", "connected", "connected", "fixed", "set", etc. used should be understood in a broad sense. For example, the "connection" can be a fixed connection, a detachable connection, or an integrated setting; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art of the present application, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. Example 1

[0040] Please refer to Figure 1A current change control device includes: a rear-stage high-current conversion circuit 1 and a control module 2, wherein the input of the rear-stage high-current conversion circuit 1 is electrically connected to the output of a high-current output device 6, and the output of the rear-stage high-current conversion circuit 1 is electrically connected to the current inlet and outlet of a subsequent device 7; the rear-stage high-current conversion circuit 1 is used to convert a higher DC voltage into a lower DC voltage;

[0041] The subsequent high-current conversion circuit 1 is electrically connected to the control module 2. The control module 2 controls the current rise time at the output end of the subsequent high-current conversion circuit 1 so that the current at the output end of the subsequent high-current conversion circuit 1 rises or falls smoothly.

[0042] The post-stage high-current conversion circuit 1 includes a buck circuit 11 and a MOS transistor driver circuit 12. The buck circuit 11 converts a higher DC voltage into a lower DC voltage within a certain period of time through a combination of switching elements, diodes, inductors, and capacitors. The MOS transistor driver circuit 12 amplifies the PWM control signal generated by the control module 2 and drives the MOS transistor to turn on or off.

[0043] Please refer to Figure 2 The BUCK step-down circuit 11 includes: a number of capacitors, MOS tubes Q1 and Q2, a diode D7, an inductor U5, and connection terminals U8 and U9; U8 and U9 are connection terminals soldered on the circuit board, and the model number is 14580400M5. Several capacitors are connected in parallel between the input terminal VCC and the ground terminal GND, and the output terminal IOUT and the ground terminal GND of the BUCK step-down circuit 11. A MOS transistor Q1 is connected in series with the input terminal VCC. A MOS transistor Q2 is connected in parallel at both ends of the MOS transistor Q1. A resistor R24 ​​and a capacitor C55 are also connected in parallel at both ends of the MOS transistor Q1. The D poles of the MOS transistors Q1 and Q2 are connected to the input terminal VCC, the S poles are connected to the output terminal IOUT, and the G poles are connected to the outputs G1 and G2 of the MOS transistor pole driving circuit 12, respectively. The S poles of the MOS transistors Q1 and Q2 are connected to the cathode of the diode D7, the anode of the diode D7 is grounded, the S poles of the MOS transistors Q1 and Q2 are connected to the VS terminal, and an inductor U5 is connected in series between the VS terminals. A VCC voltage divider detection circuit is connected to the terminal U8, such as Figure 6 As shown, the VCC voltage-dividing detection circuit signal undergoes analog-to-digital conversion and is output to control module 2. VCC is divided by R51 and R70, filtered by C95, and output from VCC_ADC to the MCU for ADC conversion and measurement. The subsequent high-current conversion circuit 1 effectively converts the higher DC voltage into the required lower DC voltage, ensuring smooth current output.

[0044] It's worth noting that the buck circuit controls current flow by periodically turning MOSFETs Q1 and Q2 on and off. When MOSFETs Q1 and Q2 are on, the input voltage is directly applied to inductor U5, causing current to increase. When MOSFETs Q1 and Q2 are off, the inductor current flows to the output through diode D7.

[0045] When the MOS transistors Q1 and Q2 are turned on, energy is stored in the inductor U5 . When the MOS transistors Q1 and Q2 are turned off, the inductor U5 attempts to maintain current flow, causing the inductor U5 to release its stored energy to the subsequent device 7 and the output capacitor.

[0046] By adjusting the duty cycle of MOS transistors Q1 and Q2 (the ratio of the on-time to the cycle time of MOS transistors Q1 and Q2), the average output voltage and current can be controlled. A larger duty cycle results in a higher output voltage or current, while a smaller duty cycle results in a lower output voltage and current. The output capacitor smooths the output voltage and reduces ripple, making it more suitable for powering subsequent devices 7.

[0047] Please refer to Figure 3 The MOS transistor drive circuit 12 includes: a DC-DC boost conversion circuit and a PWM control signal amplification circuit; the DC-DC boost conversion circuit includes: an isolated DC_DC chip M3, inductors L7 and L8, capacitors C29, capacitors C31, and capacitors C32; one end of the inductor L7 is connected to the power supply 12V and the other end is connected to pin 2 of the isolated DC_DC chip M3, and both ends of the inductor L7 are connected to ground via capacitors C31 and C32; pin 1 of the isolated DC_DC chip M3 is grounded, pin 3 of the isolated DC_DC chip M3 is connected to one end of the inductor L8, and the other end of the inductor L8 is connected to 12VA, pin 5 of the isolated DC_DC chip M3 is connected to VS, and C29 is connected between VS and 12VA;

[0048] Please refer to Figure 3The PWM control signal amplification circuit includes: an optocoupler U1, resistors R1, R2, R9, R10, R12, and Zener diodes D3 and D6; pin 1 of the optocoupler U1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the PWM signal output by the control module 2; pins 4 and 6 of the optocoupler U1 are connected to VS and 12VA respectively; pin 5 of the optocoupler U1 outputs two branches, namely G1 and G2, and resistors R2 and R9 are connected in series with G1 and G2 respectively; G1 and VS are connected through a parallel resistor R12 and a Zener diode D6; G2 and VS are connected through a parallel resistor R10 and a Zener diode D3. It is worth noting that the isolated DC_DC chip M3 is VRB1212YMD-5WR3. Because the MOS tube and the control circuit do not share a common ground, a 12V to 12V isolated power supply module is required to provide isolated power for the gate drive; the optocoupler U1 is a high-speed optocoupler, model FOD8342TR2. The gate drive signal of the MOS tube must be added between the G pole and the S pole. The S pole is the negative pole of the drive signal. It does not share a common ground with the entire control circuit. Therefore, an optocoupler U1 and the isolated power supply module M3 are required to form a drive circuit with a local power supply and ground, that is, Figure 2 and Figure 3 The +12VA and VS shown in the figure can ensure that the MOS can be turned on or off reliably.

[0049] Please refer to Figure 4 The control module 2 is mainly controlled by the STM32F301K8T6 single-chip microcomputer, which controls the single-chip microcomputer to output a PWM signal from the PWM pin. The signal is loaded into the BUCK step-down circuit 11 through the MOS tube drive circuit 12 to control the operation of the BUCK step-down circuit 11.

[0050] The control module 2 is mainly connected to a crystal oscillator circuit, a debugging circuit, and a decoupling circuit.

[0051] The control module 2 is connected to a human-computer interaction module 5, which is used to set the current rise and fall time parameters. This module uses the commercially available TJC8048X543_011C_1. The control module 2 is equipped with a human-computer interaction interface, allowing users to flexibly set the current rise and fall times according to actual needs. This allows the device to adapt to different testing requirements and expand its application range.

[0052] As an application example, operators connect this device in series during a loop resistance test. When a 100A current is applied to the loop resistance tester, the current in the entire loop does not immediately rise to 100A, but rather rises to 100A over 2 seconds or longer. After the test is completed, the current slowly decreases to 0. This avoids the need to remove secondary wires when performing loop resistance tests on circuit breakers with voltage levels of 220kV and above, reducing operational risks.

[0053] Workflow: After the device is powered on, the rise and fall times of the output current are set through the human-computer interaction module 5;

[0054] At this time, the control module 2 performs VCC voltage detection through the VCC voltage divider detection circuit. If the large current emitting device 6 outputs current, the change of VCC voltage will be detected because the MOS tube in this device is in the disconnected state. Once the VCC voltage is detected;

[0055] The MCU immediately outputs a PWM signal to control the operation of the buck circuit. The duty cycle (D) of the PWM signal slowly increases from 0% to 100%. As the PWM duty cycle increases, the output current of the buck circuit slowly increases from 0 to 100%.

[0056] By controlling the smooth rise of current, high voltage induction generated during current mutation is avoided, effectively reducing interference with the secondary circuit system, thereby significantly reducing the risk of equipment malfunction and failure, ensuring the safety of equipment and operators, reducing working time and improving work efficiency; and reducing the additional risks brought about by disconnecting the busbar differential protection current loop. Example 2

[0057] Based on Example 1, please refer to Figures 1 to 4 This embodiment provides a current change control device, which also includes an output current detection module 3; the output current detection module 3 is electrically connected to the control module 2, and the output current detection module 3 is used to collect the current signal at the output end of the subsequent-stage large current conversion circuit 1 and output the current signal to the control module 2. The control module 2 adjusts the current rise time at the output end of the subsequent-stage large current conversion circuit 1 in real time according to the current signal, forming a closed-loop feedback system, thereby ensuring that the current at the output end of the subsequent-stage large current conversion circuit 1 rises or falls smoothly.

[0058] The output current detection module 3 is a Hall current sensor, the Hall current sensor model is WHK_EKA5S2, such as Figure 5 As shown in Figure 1, the Hall effect current sensor output is connected to CN21. Using a Hall effect current sensor for current detection enables high-precision current monitoring, improving the system's response speed and accuracy to current changes, and further enhancing device reliability.

[0059] The current signal at the output of the subsequent high-current conversion circuit 1, collected by the Hall current sensor, undergoes voltage division and filtering before being converted to analog-to-digital (A / D) and input into the control module 2. The Hall current sensor model is WHK_EKA5S2. Its output signal is 0-5V, so a voltage divider circuit is required to attenuate it to a 0-3.3V analog signal for accurate acquisition by the microcontroller's ADC. A filtering circuit also filters out external noise and interference. A closed-loop feedback mechanism monitors and adjusts the output current in real time, ensuring stable current fluctuations. This makes the current rise and fall more controllable, improving the reliability of the test process.

[0060] Workflow: After the device is powered on, the rise and fall times of the output current are set through the human-computer interaction module 5;

[0061] At this time, the control module 2 performs VCC voltage detection through the VCC voltage divider detection circuit. If the large current emitting device 6 outputs current, the change of VCC voltage will be detected because the MOS tube in this device is in the disconnected state. Once the VCC voltage is detected;

[0062] The MCU immediately outputs a PWM signal to control the operation of the BUCK circuit. The duty cycle (D) of the PWM signal slowly increases from 0% to 100%.

[0063] As the PWM duty cycle increases, the output current of the buck circuit slowly increases from 0 to 100%. By controlling the smooth rise of the current, high voltage induction caused by the sudden change of the current is avoided.

[0064] It effectively reduces interference to the secondary circuit system, thereby significantly reducing the risk of equipment malfunction and failure, ensuring the safety of equipment and operators, reducing working time and improving work efficiency; and reducing the additional risks brought about when disconnecting the busbar differential protection current loop.

[0065] Cooperate with the output current detection module 3 to detect the output current signal in real time. The current signal is input to the single-chip microcomputer through voltage division, filtering circuit 4 and analog-to-digital conversion. The single-chip microcomputer adjusts the PWM output duty cycle in real time according to the real-time signal to form a closed-loop feedback system;

[0066] After the system is working, the Hall current sensor detects the output current and feeds it back to the microcontroller. The microcontroller calculates the error between the target current and the actual current and performs PID operation on the error. The input parameter of PID is the error, and the output control signal is the duty cycle of PWM. The duty cycle is proportional to the output current.

[0067] If the output current is less than the target current, the duty cycle is increased after PID calculation, and vice versa. The target current is determined by the current rise time and the maximum current set by the user.

[0068] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Replacements may include partial structures, devices, or method steps, or they may be complete technical solutions. Equivalent replacements or modifications based on the technical solution and its concept of the present invention are intended to fall within the scope of protection of the present invention.

Claims

1. A current change control device, characterized in that: include: A subsequent high-current conversion circuit, a control module, and an output current detection module, wherein the input of the subsequent high-current conversion circuit is electrically connected to the output of the high-current emitting device, and the output of the subsequent high-current conversion circuit is electrically connected to the current inlet and outlet of the subsequent device; the subsequent high-current conversion circuit is used to convert a higher DC voltage into a lower DC voltage; The latter high current conversion circuit is electrically connected to a control module, and the control module controls the current rise time of the output terminal of the latter high current conversion circuit so that the current of the output terminal of the latter high current conversion circuit rises or falls smoothly; The output current detection module is electrically connected to the control module. The output current detection module is used to collect the current signal at the output end of the subsequent high-current conversion circuit and output the current signal to the control module. The control module adjusts the current rise time at the output end of the subsequent high-current conversion circuit in real time according to the current signal, forming a closed-loop feedback system, thereby ensuring that the current at the output end of the subsequent high-current conversion circuit rises or falls smoothly.

2. The current variation control device according to claim 1, wherein: The post-stage high-current conversion circuit includes: a buck step-down circuit and a MOS transistor pole drive circuit. The buck step-down circuit converts a higher DC voltage into a lower DC voltage within a certain period of time through a combination of switching elements, diodes, inductors, and capacitors. The MOS transistor pole drive circuit amplifies the PWM control signal generated by the control module and drives the MOS transistor to turn on or off.

3. The current change control device according to claim 2, wherein: The buck circuit includes: a plurality of capacitors, MOS transistors Q1 and Q2, a diode D7, an inductor U5, and connection terminals U8 and U9. The plurality of capacitors are connected in parallel between the input terminal VCC and the ground terminal GND, and the output terminal IOUT and the ground terminal GND of the buck circuit. The MOS transistor Q1 is connected in series with the input terminal VCC, and the MOS transistor Q2 is connected in parallel at both ends of the MOS transistor Q1. A resistor R24 ​​and a capacitor C55 are also connected in parallel at both ends of the MOS transistor Q1. The D poles of the MOS transistors Q1 and Q2 are connected to the input terminal VCC, the S poles are connected to the output terminal IOUT, and the G poles are connected to the MOS transistor pole drive circuit outputs G1 and G2, respectively. The S poles of the MOS transistors Q1 and Q2 are connected to the cathode of the diode D7, the anode of the diode D7 is grounded, the S poles of the MOS transistors Q1 and Q2 are connected to the VS terminal, and the inductor U5 is connected in series between the VS terminals. The connection terminal U8 is connected to a VCC voltage divider detection circuit, and the signal of the VCC voltage divider detection circuit is output to the control module after analog-to-digital conversion.

4. The current variation control device according to claim 2, wherein: The MOS transistor drive circuit includes: a DC-DC boost conversion circuit and a PWM control signal amplification circuit; the DC-DC boost conversion circuit includes: an isolated DC_DC chip M3, inductors L7, L8, capacitors C29, capacitors C31, and capacitors C32; one end of the inductor L7 is connected to the power supply 12V and the other end is connected to pin 2 of the isolated DC_DC chip M3, and both ends of the inductor L7 are connected to the ground through capacitors C31 and C32 respectively; pin 1 of the isolated DC_DC chip M3 is grounded, pin 3 of the isolated DC_DC chip M3 is connected to one end of the inductor L8, and the other end of the inductor L8 is connected to 12VA, pin 5 of the isolated DC_DC chip M3 is connected to VS, and VS is connected to C29 is connected between 12VA; the PWM control signal amplifying circuit includes: a photoelectric coupler U1, resistors R1, R2, R9, R10, R12, Zener diodes D3 and D6; pin 1 of the photoelectric coupler U1 is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the PWM signal output by the control module, pins 4 and 6 of the photoelectric coupler U1 are connected to VS and 12VA respectively, and pin 5 of the photoelectric coupler U1 outputs two branches, namely G1 and G2, and resistors R2 and R9 are connected in series on G1 and G2 respectively; G1 and VS are connected through a parallel resistor R12 and a Zener diode D6; G2 and VS are connected through a parallel resistor R10 and a Zener diode D3.

5. The current variation control device according to claim 1, wherein: The control module adopts STM32F301K8T6 single-chip microcomputer as main control, controls the single-chip microcomputer to output PWM signal from PWM pin, and the signal is loaded into BUCK step-down circuit through MOS tube drive circuit to control the operation of BUCK step-down circuit.

6. The current variation control device according to claim 5, wherein: The control module is mainly connected to a crystal oscillator circuit, a debugging circuit, and a decoupling circuit.

7. The current variation control device according to claim 1, wherein: The output current detection module is a Hall current sensor.

8. The current variation control device according to claim 7, wherein: The current signal at the output end of the subsequent high current conversion circuit collected by the Hall current sensor is subjected to voltage division and filtering, and then analog-to-digital conversion is input into the control module.

9. The current variation control device according to claim 3, wherein: The control module is connected to a human-computer interaction module, and the human-computer interaction module is used to set the current rise and fall time parameters.

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