Power supply system of fixed magnetic generation test equipment and multi-mode current output method thereof

Abstract

Power supply system for fixed magnetic generation test equipment and multi-mode current output method thereof. The present invention discloses a power supply system for fixed magnetic generation test equipment, including a rectifier unit, a charging unit, an energy storage unit, a main power supply and a secondary power supply; the output end of the rectifier unit is respectively connected to the charging unit and the secondary power supply, the charging unit is respectively connected to the main power supply and the energy storage unit through two circuits with switches, the output end of the energy storage unit is also connected to the main power supply, and the main power supply and the secondary power supply each contain an independent power supply; the main power supply and the secondary power supply each supply power to the coils in the X, Y, and Z directions, and can generate a synthetic magnetic field in any direction; a corresponding multi-mode current output method is also disclosed; it has the advantages of reasonable structure and layout, good controllability, high reliability, good adaptability, and low pollution to the power grid.

Description

Technical Field

[0001] The present invention belongs to the field of electromagnetics, and specifically relates to a power supply system of a fixed magnetizing test device and a multi-mode current output method thereof, which is particularly suitable for providing pulse current outputs of different modes for the fixed magnetizing device and compensating for the geomagnetic field, and can provide power for simulating the generation of various types of magnetic fields, providing a basis for improving the magnetic field protection process. Background Art

[0002] According to Faraday's law of electromagnetic induction, if an electromagnetic pulse acts around an electronic product, an electromotive force will be induced in the circuit of the electronic product, generating current, which may affect the performance at best and burn the circuit at worst, making the electronic product permanently ineffective. Especially for energy platforms with independent embedded systems, such as nuclear power plants and chemical plant control systems, when affected by electromagnetic pulses, the electromotive force induced on the data line, address line, and control line of the embedded system will cause the high and low levels to become disordered, thereby further affecting the automatic control ability of the entire system, resulting in catastrophic consequences. Therefore, designing a set of magnetic testing equipment to carry out strong magnetic shock tests on key components to test their ability to resist electromagnetic pulses is not only of great guiding significance for improving and strengthening the electromagnetic shielding ability of electronic components, but also of great significance for reducing the risks of losing control when using them.

[0003] During the magnetization process of magnetization test equipment, how to generate reliable output current is the top priority to ensure the effectiveness and reliability of the magnetization process.

[0004] The power supply system of the magnetic field test equipment needs to provide a large pulse current amplitude, a short rise time, and needs to output pulse current and direct current at the same time. Therefore, it has very high design requirements for system construction and energy storage. Designing a power supply system suitable for magnetic field simulation and generation equipment is of great significance to the development of magnetic field protection. Summary of the invention

[0005] The object of the present invention is to provide a power supply system for fixed magnetoelastic testing equipment with good controllability and high reliability.

[0006] As one aspect of the present invention, the present invention provides a power supply system for a fixed magnetic generation test device, comprising a rectifier unit, a charging unit, an energy storage unit, a main power supply and an auxiliary power supply, wherein the output end of the rectifier unit is respectively connected to the charging unit and the auxiliary power supply, the charging unit is respectively connected to the main power supply and the energy storage unit through two circuits with switches, the output end of the energy storage unit is also connected to the main power supply, and the main power supply and the auxiliary power supply each contain an independent power supply; the electric energy from the main power is output as direct current through the rectifier unit, and the direct current is respectively supplied to the charging unit and the auxiliary power supply, and the charging unit enters the energy storage unit after completing the charging process, and the energy storage unit can supply energy to the main power supply through the energy storage unit, so that the main power supply generates an alternating pulse current, and supplies power to the X-direction working coil, the Y-direction working coil and the Z-direction working coil respectively, and after the direct current through the rectifier unit enters the auxiliary power supply, the auxiliary power supply provides a continuously output compensation current to the X-direction auxiliary coil, the Y-direction auxiliary coil and the Z-direction auxiliary coil respectively.

[0007] Furthermore, the rectifier unit includes an upper compartment and a lower compartment; the upper compartment is a power distribution module, including a micro-breaker, a terminal block and a UPS power supply, which is used for power supply equipment to control the distribution of electricity; the lower compartment is a rectifier module, including a circuit breaker, a 12-pulse rectifier transformer, a rectifier diode, a fuse, an RC absorption circuit, a voltage-stabilizing resistor and a controller; the circuit breaker controls the start, stop and protection actions of the rectifier; the rectifier diode adopts a two-in-one rectifier diode, and multiple rectifier diodes form a power unit; the fuse is used to prevent the diode from short-circuiting and eventually causing an input short circuit; the voltage-stabilizing resistor is used to maintain the DC side voltage of the rectifier bridge at the rated value;

[0008] The rectifier unit is used to integrate AC power into DC power and provide power for the three auxiliary power supplies and the charging unit. In order to reduce harmonics and improve the pollution of the power grid environment, 12-pulse uncontrolled rectification is adopted. The distribution unit is mainly used to control the distribution of power to the power supply equipment. The input circuit breaker controls the start, stop and protection action of the rectifier.

[0009] Furthermore, the connection group of the 12-pulse rectifier transformer is Dy11Dd0, and the primary winding adopts the extended triangle connection method.

[0010] Furthermore, the charging unit controls the DC output by the rectifier unit, which can charge the energy storage unit and provide energy for the main power supply; it has constant current, constant voltage and constant power charging modes; it includes an input circuit breaker, a supporting capacitor, a power unit IGBT, a smoothing reactor, a filter capacitor, a switch IGBT, structural parts and a controller; the internal topology of the charging unit uses a triple BUCK chopper circuit, which is equivalent to three single buck chopper circuits in parallel; the single buck chopper circuit has two situations: continuous and discontinuous inductor current; when the inductor current is continuous, when the switch tube is turned on, the freewheeling diode is cut off, and the voltage source and the current are connected. The inductor and the load form a conduction loop, the voltage source charges the capacitor, the inductor stores energy, and the inductor current increases linearly with time; when the switch tube is turned off, the voltage source is disconnected from the circuit. Since the inductor current cannot change suddenly, the inductor current gradually decreases, and the energy on the inductor also slowly decreases; when the current on the inductor decreases, the freewheeling diode is turned on to form a path; when the current flowing through the load begins to decrease, in order to keep the output voltage and current unchanged, the capacitor begins to discharge; pre-charging is required before the charging unit is started. After the pre-charging is completed, the circuit breaker is closed and the charging unit is started; the input DC is chopped by triple BUCK to control the output current; it has two outputs.

[0011] Furthermore, since the charging unit repeatedly switches between the three two-way output in the magnetic generation test, IGBT is used instead of the switch to reduce the switching sound and time.

[0012] Furthermore, the energy storage unit uses a supercapacitor as an energy storage element;

[0013] Supercapacitors have the following three working modes: energy storage unit working independently, charging unit working independently, and energy storage unit and charging unit working together; these three working modes correspond to the main power supply outputting pulse sequence current, continuous current, pulse string current and short-term continuous pulse current.

[0014] Furthermore, the main power supply includes three completely identical independent power supplies, each of which includes an input circuit breaker, a supporting capacitor, a power unit IGBT, a smoothing reactor, a filter capacitor, a load-unloading IGBT, a thyristor, a load-unloading resistor, a small chopper IGBT, a small chopper power supply module, structural parts and a controller; the main power supply controls the electric energy of the energy storage unit to output an intermittent pulse current that alternates between positive and negative and gradually decays for the working coil; it can realize local and remote control, and upload the charging parameters to the host computer by means of communication; it outputs a pulsed attenuation or a continuous constant current, and the attenuation amplitude, pulse time, etc. can be set to meet the energy requirements of the working coil.

[0015] Furthermore, the main power supply also includes a chopper circuit and a commutation circuit. The chopper circuit is triple BUCK chopper for controlling the output current; the commutation circuit is a thyristor H-bridge circuit, which changes the output current direction by controlling the thyristor opening sequence.

[0016] Furthermore, the auxiliary power supply includes three completely identical independent power supplies, each of which includes an input circuit breaker, a supporting capacitor, a power unit IGBT, a smoothing reactor, a filter capacitor, a thyristor, a structural component and a controller; the auxiliary power supply outputs a constant stable current to ensure that the X-direction auxiliary coil, the Y-direction auxiliary coil and the Z-direction auxiliary coil generate a magnetic field required to compensate for the geomagnetic field; the auxiliary power supply converts the internal energy of the battery into the electric energy required by the magnetic field coil through internal chopping and commutation of the auxiliary power supply, and then transmits it to the X-direction auxiliary coil, the Y-direction auxiliary coil and the Z-direction auxiliary coil.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. The power supply system of the fixed magnetic generating test equipment of the present invention has reasonable structure and layout, good controllability and high reliability.

[0019] 2. The power supply system of the fixed magnetic generation test equipment of the present invention can output various types of currents with controllable size, good adaptability and little pollution to the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a diagram showing the connection structure of a power supply system of a fixed magnetoelectric testing device according to a preferred embodiment of the present invention;

[0021] Figure 2 It is the main topology diagram of the rectifier unit of the preferred embodiment of the present invention;

[0022] Figure 3 This is the main topology diagram of the charging unit of the preferred embodiment of the present invention;

[0023] Figure 4 is a main power supply circuit topology diagram of a preferred embodiment of the present invention;

[0024] Figure 5 It is a topological diagram of the secondary power supply circuit of a preferred embodiment of the present invention.

[0025] The reference numerals in the figure are as follows: 1-rectifier unit, 2-charging unit, 3-energy storage unit, 4-main power supply, 5-auxiliary power supply; DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0027] Figure 1The figure shows the connection structure of the power system of the fixed magnetic test equipment, including a rectifier unit, a charging unit, an energy storage unit, a main power supply and a secondary power supply. The function of the rectifier unit is to integrate the AC power into DC power and provide power for the three secondary power supplies and the charging unit; the function of the energy storage unit is to provide DC power for the device, including a charging switch device and a battery; the function of the charging unit is to control the DC output of the rectifier unit, which can charge the energy storage unit and provide energy for the main power supply. It has constant current, constant voltage and constant power charging modes; the function of the energy storage unit is to provide energy for the main power supply, and together with the charging unit, it can work in coordination with different main power supply working modes, so that the main power supply can output pulse current, continuous current, pulse train current and short-term continuous pulse; the function of the main power supply is to output intermittent pulse current with alternating positive and negative and gradually decaying for the working coil by controlling the electric energy of the energy storage unit; the function of the secondary power supply is to output a constant and stable current to ensure that the auxiliary coils in the X direction, the auxiliary coils in the Y direction and the auxiliary coils in the Z direction generate the magnetic field required to compensate for the geomagnetic field.

[0028] Figure 2 The main topology diagram of the rectifier unit 1 is shown (in the figure, Q1 is the input AC circuit breaker; EMC is the AC filter; T1 is a 12-pulse phase-shifting transformer; FU1~FU12 are fuses; D1~D12 are rectifier diode modules; R1 is a voltage-stabilizing resistor). In order to reduce harmonics and improve the pollution of the power grid environment, the present invention uses 12-pulse uncontrolled rectification. The input voltage of the rectifier unit is AC380V, and the input circuit breaker controls the start, stop and protection action of the rectifier; the connection group is Dy11Dd0, and the secondary winding uses the extended triangle connection method, and the phase voltage with equal amplitude, the rectifier circuit using the extended triangle connection method can reduce the total harmonic distortion rate injected into the grid side, the harmonic content is small, and the output DC quality is high, which can improve the rectification efficiency.

[0029] The diode module uses a two-in-one rectifier diode, and multiple rectifier diodes (for example, 3) form a power unit; the fuse is mainly used to prevent the diode from short-circuiting and eventually causing an input short circuit; the stabilizing resistor is used to maintain the DC side voltage of the rectifier bridge at the rated value.

[0030] Figure 3The main topology of charging unit 2 is shown in the figure (in the figure, Q1 is the input circuit breaker; K1 is the pre-charging contactor; R1 is the pre-charging resistor; R2 is the discharge resistor; C1 is the support capacitor; V1 and V2 are voltage sensors; G1 is the chopper power device IGBT; L1, L2, L3 are smoothing reactors; A1, A2, A3 are current sensors; C2 is a filter capacitor; G2 and G3 are IGBTs, charging switch devices). The charging unit includes an input circuit breaker, support capacitors, power unit IGBTs, smoothing reactors, filter capacitors, switch IGBTs, structural parts and controllers. The internal topology of the charging unit uses a triple BUCK chopper circuit, which is equivalent to three single buck chopper circuits in parallel.

[0031] There are two situations in the single-step-down chopper circuit: continuous and discontinuous inductor current. This is mainly related to the value of the smoothing reactance. When the reactance value is small, the output current is sawtooth-shaped, the current peak of the power device is high, the electromagnetic interference is poor, and the output voltage is related to the energy storage of the inductor, which is not calculated by the duty cycle. All chopper circuits in this system are in a continuous state, the smoothing reactance value is large, the output current waveform is smooth, and the current peak flowing through the power device is small. The output current can be adjusted by controlling the duty cycle. When the switch tube is turned on, the freewheeling diode is cut off, and the voltage source forms a conduction loop with the inductor and the load. The voltage source charges the capacitor, the inductor stores energy, and the inductor current increases linearly with time. When the switch tube is turned off, the voltage source is disconnected from the circuit. Since the inductor current cannot change suddenly, the inductor current gradually decreases, and the energy on the inductor also slowly decreases. When the current on the inductor decreases, the freewheeling diode is turned on to form a path. When the current flowing through the load begins to decrease, in order to keep the output voltage and current unchanged, the capacitor begins to discharge. The charging unit needs to be pre-charged before starting. After the pre-charging is completed, the circuit breaker is closed and the charging unit is started. The input DC is chopped by triple BUCK to control the output current. It has two outputs. Because the charging unit repeatedly switches between the three outputs in the magnetic field test, IGBT is used instead of the switch in this design to reduce the switching sound and time.

[0032] Figure 4This is the circuit topology diagram of the main power supply 4 (in the figure, Q1, Q2, Q3 are input circuit breakers; K1, K2, K3 are pre-charging contactors; R1, R3, R5 are pre-charging resistors; R2, R4, R6 are discharge resistors; C1, C3, C5 are support capacitors; V1, V2, V3 are DC voltage sensors; G1~G18 are chopper power device IGBTs; L1~L9 are smoothing reactors; A1~A9 are high-precision current sensors; C2, C4, C6 filter capacitors; D1~D12 are commutator thyristors; F1~F6 are output protection fuses). The main power supply includes input circuit breakers, support capacitors, power unit IGBTs, smoothing reactors, filter capacitors, unloading IGBTs, thyristors, unloading resistors, small chopper IGBTs, small chopper power modules, structural parts and controllers. The main power supply is mainly composed of a chopper circuit and a commutation circuit. The chopper circuit is triple BUCK chopper, which is used to control the output current; the commutation circuit is a thyristor H-bridge circuit, which changes the output current direction by controlling the thyristor opening sequence.

[0033] In the case of high current, in order to reduce the impact of instantaneous high-power pulses on the power grid, a supercapacitor energy storage cabinet is added as a buffer. In the current rising stage, the supercapacitor energy storage cabinet provides energy to the main power supply, and in the continuous output stage, the main power supply energy input is switched to the rectifier cabinet.

[0034] The multi-mode current output method is described in detail as follows:

[0035] Mode 1: It is used to output pulse sequence current, output positive and negative alternating, regularly decaying pulse trains. This working mode is used to simulate strong magnetic shock under actual working conditions. Before power-on, the planned operation mode is input to the main power supply main controller through the host computer or integrated control console. The main controller controls the main power supply to power on. After receiving the output command, the main controller adjusts the duty cycle of the power unit IGBT, and outputs a stable and continuous current through the current loop PID control. The main controller counts the output current time. Once the preset time is reached, the chopper unit IGBT will be turned off. At the same time, the commutator thyristor H bridge is turned off because the output current is reduced to 0, and an output pulse is cut off. When the output current is about to reach 0, the main controller timer starts to count the current stop time. Once the designed time is reached, the main controller calculates the current required for this pulse according to the preset decreasing rule (arithmetic progression, geometric ratio), and controls the commutator thyristor to turn on. The main controller controls the IGBT duty cycle of the chopper unit to gradually increase it. It can rise according to the agreed time until the current rises to the calculated value of this pulse and then continue. The same is true for other pulses until it decreases to the required minimum value.

[0036] Mode 2: used to output short-term continuous current. The main power supply current value, direction and duration are set through the host computer or integrated control console. After receiving the command, the main controller will logically power on the device according to the startup process. After the charger completes charging the energy storage cabinet, the main controller receives the "output" command, controls the commutator to switch to the thyristor of the required output direction, and controls the duty cycle of the chopper unit IGBT through PID closed-loop control to output the required stable current. After the current rises to the required value, the internal timer of the main controller starts timing. Once the time reaches the preset value, the chopper unit IGBT is turned off, and after the current decays to 0, the commutator thyristor is turned off.

[0037] Mode 3: used to output single pulse current. The equipment operation status is the same as that of Mode 2.

[0038] Mode 4: used to output continuous current. This state is a continuous operation state. The main power supply working time and current size are set, and the main power supply outputs continuous current.

[0039] Figure 5 The circuit topology diagram of the auxiliary power supply 5 includes input circuit breaker, support capacitor, power unit IGBT, smoothing reactor, filter capacitor, thyristor, structural parts and controller. The auxiliary power supply converts the internal energy of the battery into the electric energy required by the magnetic field coil through chopping and commutation inside the auxiliary power supply, and then transmits it to the compensation coils in each direction. The auxiliary power supply cabinet contains 3 identical independent power supplies, each of which includes a circuit breaker, a chopper unit, a commutation unit, etc.

[0040] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A power supply system for a fixed magnetic generating test device, characterized in that: The invention comprises a rectifier unit (1), a charging unit (2), an energy storage unit (3), a main power supply (4) and an auxiliary power supply (5), wherein the output end of the rectifier unit (1) is connected to the charging unit (2) and the auxiliary power supply (5) respectively, the charging unit (2) is connected to the main power supply (4) and the energy storage unit (3) respectively through two circuits with switches, the output end of the energy storage unit (3) is also connected to the main power supply (4), and the main power supply (4) and the auxiliary power supply (5) each contain three independent power supplies; the electric energy from the main power is output as direct current through the rectifier unit, The direct current is supplied to the charging unit (2) and the auxiliary power supply (5) respectively. After the charging process of the charging unit is completed, the direct current enters the energy storage unit (3). The energy storage unit can supply energy to the main power supply, so that the main power supply generates an alternating pulse current and supplies power to the X-direction working coil, the Y-direction working coil and the Z-direction working coil respectively. A magnetic field with any spatial orientation can be generated. After the direct current of the rectifier unit enters the auxiliary power supply, the auxiliary power supply provides a continuous output compensation current to the X-direction auxiliary coil, the Y-direction auxiliary coil and the Z-direction auxiliary coil respectively, so as to offset the local geomagnetic field. The rectifying unit (1) comprises an upper bin and a lower bin; The upper compartment is the power distribution module, including micro-circuit breakers, wiring terminals and UPS power supply, which is used to distribute power to power equipment control. The lower compartment is the rectifier module, including a circuit breaker, a 12-pulse rectifier transformer, a rectifier diode, a fuse, an RC absorption circuit, a voltage-stabilizing resistor and a controller; the circuit breaker controls the start, stop and protection actions of the rectifier; the rectifier diode uses a two-in-one rectifier diode, and multiple rectifier diodes form a power unit; the fuse is used to prevent the diode from short-circuiting and eventually causing an input short-circuit; The voltage stabilizing resistor is used to maintain the DC side voltage of the rectifier bridge at the rated value; The rectifier unit is used to integrate AC power into DC power to provide power for the 3 auxiliary power supplies and the charging unit. It uses 12-pulse uncontrolled rectification. The power distribution unit is used to control the distribution of power to the power supply equipment. The input circuit breaker controls the start, stop and protection of the rectifier. The charging unit (2) controls the direct current output by the rectifying unit (1), which can charge the energy storage unit (3) and provide energy for the main power supply (4); it has a constant current, constant voltage and constant power charging mode; and includes an input circuit breaker, a supporting capacitor, a power unit IGBT, a smoothing reactor, a filter capacitor, a switch IGBT, a structural component and a controller; The internal topology of the charging unit uses a triple BUCK chopper circuit, which is equivalent to three single buck chopper circuits in parallel. The single buck chopper circuit has two situations: continuous and discontinuous inductor current. When the inductor current is continuous, when the switch tube is turned on, the freewheeling diode is cut off, and the voltage source, inductor and load form a conduction loop. The voltage source charges the capacitor, the inductor stores energy, and the inductor current increases linearly with time. When the switch tube is turned off, the voltage source is disconnected from the circuit. Since the inductor current cannot change suddenly, the inductor current gradually decreases, and the energy on the inductor also slowly decreases. When the current on the inductor decreases, the freewheeling diode is turned on to form a path. When the current flowing through the load begins to decrease, in order to keep the output voltage and current unchanged, the capacitor begins to discharge. Pre-charging is required before the charging unit is started. After the pre-charging is completed, the circuit breaker is closed and the charging unit is started. The input DC passes through the triple BUCK chopper to control the output current and has two outputs.

2. The power supply system of the fixed magnetic testing equipment according to claim 1 is characterized in that: The connection group of the 12-pulse rectifier transformer is Dy11Dd0, and the primary winding adopts the extended triangle connection method.

3. The power supply system of the fixed magnetic generation test equipment according to claim 1 is characterized in that: Because the charging unit repeatedly switches between the three outputs in the magnetic field test, IGBT is used instead of the switch to reduce the switching sound and time.

4. The power supply system of the fixed magnetic generation test equipment according to claim 1, characterized in that: The energy storage unit (3) uses a supercapacitor as an energy storage element; Supercapacitors have the following three working modes: energy storage unit working independently, charging unit working independently, and energy storage unit and charging unit working together; these three working modes correspond to the main power supply outputting pulse sequence current, continuous current, pulse string current and short-term continuous pulse current.

5. The power supply system of the fixed magnetic generation test equipment according to claim 1, characterized in that: The main power supply (4) comprises three identical independent power supplies, each of which comprises an input circuit breaker, a supporting capacitor, a power unit IGBT, a smoothing reactor, a filter capacitor, a load-reducing IGBT, a thyristor, a load-reducing resistor, a small chopper IGBT, a small chopper power supply module, structural parts and a controller; the main power supply (4) controls the electric energy of the energy storage unit (3) to output an intermittent pulse current that alternates between positive and negative and gradually decays for the magnetic working coil; uploads the charging parameters to the upper computer in a communication manner; and outputs a pulsed decay or continuous constant current.

6. The power supply system of the fixed magnetic generation test equipment according to claim 5, characterized in that: The main power supply (4) further comprises a chopper circuit and a commutation circuit. The chopper circuit is triple-BUCK chopper for controlling the magnitude of the output current. The commutation circuit is a thyristor H-bridge circuit for changing the direction of the output current by controlling the thyristor switching sequence.

7. The power supply system of the fixed magnetic generation test equipment according to claim 6, characterized in that: The auxiliary power supply includes 3 identical independent power supplies, each of which includes an input circuit breaker, a supporting capacitor, a power unit IGBT, a smoothing reactor, a filter capacitor, a thyristor, a structural component and a controller; the auxiliary power supply outputs 3 constant stable currents to ensure that the X-direction auxiliary coil, the Y-direction auxiliary coil and the Z-direction auxiliary coil generate the magnetic field required for the compensation magnetic field; the auxiliary power supply converts the internal energy of the battery into the electric energy required by the magnetic field coil through internal chopping and commutation of the auxiliary power supply, and then transmits it to the X-direction auxiliary coil, the Y-direction auxiliary coil and the Z-direction auxiliary coil.

8. The multi-mode current output method of the power supply system of the fixed magnetic generation test equipment according to claim 7, characterized in that: There are four output modes, among which, Mode 1: used to output pulse sequence current, output positive and negative alternating, regularly decaying pulse train; before power-on, the planned operation mode is input to the main controller of the main power supply through the host computer or integrated control console, and the main controller controls the main power supply to power on. After receiving the output command, the main controller adjusts the duty cycle of the power unit IGBT, and outputs a stable and continuous current through the current loop PID control. The main controller counts the output current time. Once the preset time is reached, the chopper unit IGBT will be turned off; at the same time, the commutator thyristor H bridge is closed because the output current is reduced to 0, and an output pulse is cut off; after the output current is about to reach 0, the main controller timer is turned on to count the current stop time. Once the design time is reached, the main controller calculates the current required for this pulse according to the preset decreasing law, controls the commutator thyristor to turn on, and then controls the chopper unit IGBT duty cycle to gradually increase it. It can rise according to the agreed time until the current rises to the calculated value of this pulse and then continues. The other pulses are the same as above until they decrease to the required minimum value; Mode 2: used to output short-term continuous current. The main power supply current value, direction and duration are set through the host computer or integrated control console. After receiving the command, the main controller performs logical power-on on the device according to the startup process. After the charger completes charging the energy storage cabinet, the main controller receives the "output" command, controls the commutator to switch to the thyristor of the required output direction, and controls the duty cycle of the chopper unit IGBT through PID closed-loop control to output the required stable current. After the current rises to the required value, the internal timer of the main controller starts timing. Once the time reaches the preset value, the chopper unit IGBT is turned off, and after the current decays to 0, the commutator thyristor is turned off. Mode 3: used to output single pulse current, the equipment operation status is the same as mode 2; Mode 4: used to output continuous current. This state is a continuous operation state. The main power supply working time and current size are set, and the main power supply outputs continuous current.

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