Current change control device

Abstract

The invention relates to the technical field of current change control, and provides a current change control device, which realizes the stable rise of current, avoids the generation of dangerous voltage and ensures the safety of equipment and personnel through the 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 is 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 present invention relates to the technical field of current variation control, and in particular to a current variation control device. Background Art

[0002] At present, the resistance test of the circuit breaker conductive loop in the GIS combined electrical equipment requires at least 100A of current to flow through the entire loop (the Southern Power Grid standard stipulates that the applied current for measuring the conductive loop resistance should be no less than 100A). Due to the particularity of the GIS combined electrical equipment, the test loop also includes a current transformer.

[0003] Taking 220kV tank circuit breakers and 500kV 3 / 2 wiring as examples, current transformers are usually connected to bus differential protection devices. If the three-phase differential current reaches the start value of the bus differential protection during the test, all outgoing line bays on the entire bus will trip, causing serious equipment failures and safety hazards.

[0004] When measuring large currents (above 100A), after the current is loaded into the primary circuit, if the primary current suddenly changes from 0A to 100A, high voltage induction will be generated on the secondary side, seriously affecting the secondary circuit system, and may especially cause false operation of the bus differential protection.

[0005] Based on this, the present invention 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. Summary of the invention

[0006] The purpose of the present invention 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 object, the present invention adopts the following technical solutions:

[0008] A current change control device, comprising: a rear-stage large current conversion circuit, a control module, and an output current detection module, wherein the input of the rear-stage large current conversion circuit is electrically connected to the output end of a large current emitting device, and the output of the rear-stage large current conversion circuit is electrically connected to the current inlet and outlet of a subsequent device; the rear-stage large 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 at the output end of the latter high current conversion circuit, so that the current at the output end of the latter high current conversion circuit rises or falls steadily;

[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 to form 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 comprises: a BUCK step-down circuit and a MOS tube pole driving 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 a switching element, a diode, an inductor and a capacitor; the MOS tube pole driving circuit amplifies the PWM control signal generated by the control module and drives the MOS tube to turn on or off.

[0012] Preferably, the BUCK buck circuit comprises: a plurality of capacitors, MOS tubes Q1 and Q2, a diode D7, an inductor U5, and wiring terminals U8 and U9; the plurality of capacitors are respectively connected in parallel between an input terminal VCC and a ground terminal GND and an output terminal IOUT and a ground terminal GND of the BUCK buck circuit; a MOS tube Q1 is connected in series to the input terminal VCC; a MOS tube Q2 is connected in parallel to both ends of the MOS tube Q1; a series resistor R24 ​​and a capacitor C55 are also connected in parallel to both ends of the MOS tube Q1; the D poles of the MOS tubes 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 respectively connected to the outputs G1 and G2 of the MOS tube pole driving circuit; the S poles of the MOS tubes 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 tubes Q1 and Q2 are connected to the VS terminal, and an inductor U5 is connected in series between the VS terminal and the VS terminal; a VCC voltage divider detection circuit is connected to the wiring terminal U8, and a signal of 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, 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 the pin 2 of the isolated DC_DC chip M3, and both ends of the inductor L7 are respectively connected to the ground through 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, 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 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 to 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 main control adopts STM32F301K8T6 single-chip microcomputer, controls the single-chip microcomputer to output PWM signal from PWM pin, and the signal is loaded to BUCK buck circuit through MOS tube driving circuit to control the operation of BUCK buck 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 large current conversion circuit collected by the Hall current sensor is converted into digital form after voltage division and filtering and then input into the control module.

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

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

[0021] Improved safety: By controlling the smooth rise of current, high voltage induction generated during current mutation is avoided, effectively reducing interference to 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; reducing additional risks brought about by disconnecting 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 the 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, and users can flexibly set the rise and fall time of the current according to actual needs. This enables the device to adapt to different test requirements and enhances 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 to ensure 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 invention.

[0028] Figure 2 It is the principle diagram of the BUCK step-down circuit of the present invention.

[0029] Figure 3 This is a schematic diagram of the MOS tube pole driving circuit of the present invention.

[0030] Figure 4 This is a schematic diagram of the control module circuit of the present invention.

[0031] Figure 5 It is the principle diagram of the voltage divider and filtering circuit of the present invention.

[0032] Figure 6 It is the principle diagram of the VCC voltage division detection circuit of the present invention.

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

[0034] In order to explain in detail the possible application scenarios, technical principles, specific schemes that can be implemented, and the purposes and effects that can be achieved, 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 the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0035] Reference to "embodiment" herein means that the specific features, structures or characteristics described in conjunction with the embodiment may be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor does it particularly limit its independence or association with other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way to form a corresponding implementable technical solution.

[0036] Unless otherwise defined, the technical terms used in this document have the same meanings as those generally understood by those skilled in the art to which this application belongs; the use of relevant terms in this document 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 an expression used to describe the logical relationship between objects, indicating that three relationships may exist, for example, A and / or B, which means: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this article generally indicates that the objects before and after are in an "or" logical relationship.

[0038] Without further limitations, in this application, the words "include", "comprises", "has" 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 limited elements, but also other elements not explicitly listed, or also include 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 such as "install", "connect", "connect", "fix", "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 it can be indirectly connected through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For technicians in the technical field to which the present application belongs, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0040] Example 1

[0041] Please refer to Figure 1, a current change control device, comprising: a rear-stage large current conversion circuit 1, a control module 2, the rear-stage large current conversion circuit 1 input is electrically connected to the output end of the large current issuing device 6, and the rear-stage large current conversion circuit 1 output is electrically connected to the current inlet and outlet of the subsequent device 7; the rear-stage large current conversion circuit 1 is used to convert a higher DC voltage into a lower DC voltage;

[0042] The rear-stage large current conversion circuit 1 is electrically connected to the control module 2, and the control module 2 controls the current rise time at the output end of the rear-stage large current conversion circuit 1, so that the current at the output end of the rear-stage large current conversion circuit 1 rises or falls steadily;

[0043] The post-stage high current conversion circuit 1 includes: a BUCK step-down circuit 11 and a MOS tube pole driving circuit 12; the BUCK step-down circuit 11 converts a higher DC voltage into a lower DC voltage within a certain period of time through a combination of a switching element, a diode, an inductor and a capacitor; the MOS tube pole driving circuit 12 amplifies the PWM control signal generated by the control module 2 and drives the MOS tube to turn on or off.

[0044] Please refer to Figure 2 The BUCK step-down circuit 11 includes: a plurality 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 welded on the circuit board, and the model is 14580400M5. A 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 step-down circuit 11, a MOS tube Q1 is connected in series to the input terminal VCC, a MOS tube Q2 is connected in parallel to both ends of the MOS tube Q1, a resistor R24 ​​and a capacitor C55 are also connected in parallel to both ends of the MOS tube Q1, the D poles of the MOS tubes 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 tube pole driving circuit 12, respectively, the S poles of the MOS tubes 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 tubes 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 wiring terminal U8, such as Figure 6 As shown, the signal of the VCC voltage-dividing detection circuit is output to the control module 2 after analog-to-digital conversion. VCC is divided by R51 and R70 and then filtered by C95 and output from VCC_ADC to the MCU for ADC conversion and measurement. The post-stage high current conversion circuit 1 can effectively convert the higher DC voltage into the required lower DC voltage to ensure the stability of the current output.

[0045] It is worth noting that the BUCK circuit controls the flow of current by periodically turning on and off the MOS tubes Q1 and Q2. When the MOS tubes Q1 and Q2 are turned on, the input voltage is directly applied to the inductor U5, and the current begins to increase. When the MOS tubes Q1 and Q2 are turned off, the current of the inductor flows to the output through the diode D7.

[0046] When the MOS tubes Q1 and Q2 are turned on, energy is stored in the inductor U5; and when the MOS tubes Q1 and Q2 are turned off, the inductor U5 will try to maintain the current flow, causing the inductor U5 to release its stored energy to the subsequent device 7 and the output capacitor.

[0047] By adjusting the duty cycle of MOS tubes Q1 and Q2 (the ratio of the on time of MOS tubes Q1 and Q2 to the cycle), the average value of the output voltage and current can be controlled. A larger duty cycle will result in a higher output voltage or current, and vice versa. The capacitor at the output end is used to smooth the output voltage and reduce the ripple, making it more suitable for powering the subsequent device 7.

[0048] Please refer to Figure 3 , the MOS tube pole driving circuit 12 includes: a DC-DC boost conversion circuit and a PWM control signal amplifying 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 the pin 2 of the isolated DC_DC chip M3, and the two ends of the inductor L7 are respectively connected to the ground through capacitors C31 and C32; the pin 1 of the isolated DC_DC chip M3 is grounded, the pin 3 of the isolated DC_DC chip M3 is connected to one end of the inductor L8, the other end of the inductor L8 is connected to 12VA, the pin 5 of the isolated DC_DC chip M3 is connected to VS, and C29 is connected between VS and 12VA;

[0049] Please refer to Figure 3The PWM control signal amplifying circuit includes: a photocoupler U1, resistors R1, R2, R9, R10, R12, Zener diodes D3 and D6; pin 1 of the photocoupler 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 photocoupler U1 are connected to VS and 12VA respectively, and pin 5 of the photocoupler U1 outputs two branches, namely G1 and G2, and resistors R2 and R9 are connected in series to 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 model 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, and the S pole is the negative pole of the drive signal. It does not share a common ground with the entire control circuit, so an optocoupler U1 and an 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.

[0050] Please refer to Figure 4 The control module 2 is mainly controlled by a STM32F301K8T6 single-chip microcomputer, which controls the single-chip microcomputer to output a PWM signal from a PWM pin. The signal is loaded into the BUCK buck circuit 11 through a MOS tube driving circuit 12 to control the BUCK buck circuit 11 to work.

[0051] The control module 2 is mainly connected with a crystal oscillator circuit, a debugging circuit, and a decoupling circuit.

[0052] The control module 2 is connected to a human-machine interaction module 5, which is used to set the current rise and fall time parameters. The human-machine interaction module 5 adopts the commercially available TJC8048X543_011C_1. The control module 2 is equipped with a human-machine interaction interface, and the user can flexibly set the current rise and fall time according to actual needs. This enables the device to adapt to different test requirements and enhances its application range.

[0053] As an application example, the operator connects this device in series in the loop resistance test. When the loop resistance tester passes 100A current, the current in the entire loop will not rise to 100A immediately, but will rise to 100A in 2 seconds or longer. After the test is completed, it will also slowly decrease to 0, thus avoiding the need to remove the secondary line when testing the loop resistance of circuit breakers at 220kV voltage level and above, reducing the operation risk.

[0054] Workflow: After the device is powered on, the rise and fall time of the output current is set through the human-computer interaction module 5;

[0055] 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, since the MOS tube in the device is in the disconnected state, the change of VCC voltage will be detected. Once the VCC voltage is detected;

[0056] The microcontroller 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%;

[0057] By controlling the smooth rise of current, high voltage induction generated during current mutation is avoided, effectively reducing 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; reducing the additional risks brought about by disconnecting the bus differential protection current loop.

[0058] Example 2

[0059] Based on Example 1, please refer to Figures 1 to 4 The present 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 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 large current conversion circuit 1 in real time according to the current signal to form a closed-loop feedback system, thereby ensuring that the current at the output end of the subsequent large current conversion circuit 1 rises or falls smoothly.

[0060] The output current detection module 3 is a Hall current sensor, and the Hall current sensor model is WHK_EKA5S2. Figure 5 As shown, the output of the Hall current sensor is connected to CN21. Using the Hall current sensor 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.

[0061] The current signal at the output end of the post-stage large current conversion circuit 1 collected by the Hall current sensor is converted into digital form after voltage division and filtering and input into the control module 2. It is worth noting that the model of the Hall current sensor is WHK_EKA5S2. Its output signal is 0-5V, so the voltage divider circuit needs to be attenuated into an analog signal of 0-3.3V to be correctly collected by the ADC of the microcontroller. In addition, the filter circuit filters out noise and interference from the outside world. A closed-loop feedback mechanism is used to detect and adjust the output current in real time to ensure the stability of the current change. This makes the rise and fall of the current more controllable and improves the reliability of the test process.

[0062] Workflow: After the device is powered on, the rise and fall time of the output current is set through the human-computer interaction module 5;

[0063] 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, since the MOS tube in the device is in the disconnected state, the change of VCC voltage will be detected. Once the VCC voltage is detected;

[0064] The microcontroller 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%;

[0065] 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, the high voltage induction generated during the current mutation process is avoided;

[0066] 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 additional risks brought about when disconnecting the bus differential protection current loop.

[0067] 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 the voltage division, the filtering circuit 4 and the 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;

[0068] After the system is working, the Hall current sensor detects the output current and feeds it back to the single-chip microcomputer. The single-chip microcomputer 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.

[0069] 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 value set by the user.

[0070] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The substitution may be a substitution of a part of the structure, device, method step, or a complete technical solution. The equivalent replacement or change according to the technical solution and the inventive concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A current change control device, characterized in that: include: A rear-stage high-current conversion circuit, a control module, and an output current detection module, wherein the input of the rear-stage high-current conversion circuit is electrically connected to the output end of the high-current emitting device, and the output of the rear-stage high-current conversion circuit is electrically connected to the current inlet and outlet of the subsequent device; the rear-stage 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 at the output end of the latter high current conversion circuit, so that the current at the output end of the latter high current conversion circuit rises or falls steadily; 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 to form 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, characterized in that: The post-stage high current conversion circuit includes: a BUCK step-down circuit and a MOS tube pole driving 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 a switch element, a diode, an inductor and a capacitor; the MOS tube pole driving circuit amplifies the PWM control signal generated by the control module and drives the MOS tube to turn on or off.

3. The current variation control device according to claim 2, characterized in that: The BUCK buck circuit includes: a plurality of capacitors, MOS tubes Q1 and Q2, a diode D7, an inductor U5, and wiring terminals U8 and U9; the plurality of capacitors are respectively connected in parallel between an input terminal VCC and a ground terminal GND and an output terminal IOUT and a ground terminal GND of the BUCK buck circuit; a MOS tube Q1 is connected in series to the input terminal VCC; a MOS tube Q2 is connected in parallel to both ends of the MOS tube Q1; a series resistor R24 ​​and a capacitor C55 are also connected in parallel to both ends of the MOS tube Q1; the D poles of the MOS tubes 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 respectively connected to the outputs G1 and G2 of the MOS tube pole driving circuit; the S poles of the MOS tubes 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 tubes Q1 and Q2 are connected to the VS terminal, and an inductor U5 is connected in series between the VS terminals; a VCC voltage-dividing detection circuit is connected to the wiring terminal U8, and a signal of the VCC voltage-dividing detection circuit is output to the control module after analog-to-digital conversion.

4. The current variation control device according to claim 2, characterized in that: The MOS tube pole driving circuit includes: a DC-DC boost conversion circuit and a PWM control signal amplifying 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 the pin 2 of the isolated DC_DC chip M3, and the two ends of the inductor L7 are respectively connected to the ground through 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 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, characterized in that: 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 to BUCK step-down circuit through MOS tube driving circuit to control the operation of BUCK step-down circuit.

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

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

8. The current variation control device according to claim 7, characterized in that: The current signal at the output end of the post-stage large current conversion circuit collected by the Hall current sensor is converted into digital form after voltage division and filtering and then input into the control module.

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

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