High-power pulse degaussing power supply circuit and system

Abstract

The utility model belongs to the technical field of power electronic degaussing, and particularly relates to a high-power pulse degaussing power supply circuit and system. The circuit comprises an energy storage unit, a transformer, an AC / DC converter, a four-quadrant DC / DC converter and a DC / DC converter. The direct current side of the AC / DC converter is connected with one end of the four-quadrant DC / DC converter, and the other end of the four-quadrant DC / DC converter is used for being connected with an inductive load; and the energy storage unit is connected in parallel between the direct current side of the AC / DC converter and the four-quadrant DC / DC converter through the DC / DC converter, so that the reliability of the degaussing power supply is improved, and the device size and the equipment cost are reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of power electronic degaussing, and in particular relates to a high-power pulse degaussing power supply circuit and system. Background Art

[0002] Modern ships are complex, massive ferromagnetic structures. Due to the influence of geomagnetism, magnetic field shocks during construction and navigation, and stress shocks, the space around the ship generates a magnetic field, posing a significant threat to magnetic detection and magnetic weapon attacks. Therefore, a degaussing system is required to demagnetize the ship to improve its protection. The degaussing system primarily consists of a degaussing control device, a degaussing power supply, and a degaussing coil. Based on the control device's instructions, the degaussing power supply outputs a high-quality degaussing current to the degaussing coil, thereby offsetting the ship's own magnetic field. However, as ship displacement increases, the power demand of the degaussing system also increases. Traditional degaussing power supplies draw energy directly from the grid to magnetize the degaussing coil during the degaussing current ramp-up phase. During the degaussing current holding phase, a significant amount of energy is stored in the degaussing coil, demagnetizing the ship. During the degaussing current ramp-down phase, the energy in the degaussing coil is converted into heat through resistance and dissipated, resulting in significant energy waste. In this frequent charging and discharging scenario, if the pulse power required by the workload is all input from the grid and the excess power is all dissipated through resistance, this will not only place higher requirements on the power level of the power system and the capacity of the power supply, but will also greatly increase the pressure and harmonic pollution of the grid.

[0003] Therefore, the Chinese patent document with announcement number CN115001294B proposes a cyclic pulse high-power demagnetization main power supply system, including a transformer, a three-phase rectifier, a battery energy storage unit, a DC / DC buck-boost converter, a chopper commutation unit and a controller. The battery energy storage unit is arranged in series between the three-phase rectifier and the DC / DC buck-boost converter. The transformer is connected to the AC side of the three-phase rectifier, and the DC side of the three-phase rectifier is connected to the battery energy storage unit. After the transformer converts the mains power into the voltage level required by the three-phase rectifier circuit, the three-phase rectifier converts the three-phase AC power after the transformer steps down the voltage into DC power. During the rising phase of the pulse current, it supplies power to the large inductive load together with the battery energy storage device. During the pulse gap period of the pulse current, it supplies power to the subsequent battery energy storage device, realizing the feedback of demagnetization energy and reducing the demand for grid capacity. However, its battery energy storage units are directly connected to the main power system after being connected in parallel. If high-voltage battery components are used, a large number of batteries need to be connected in series, resulting in a larger device, higher cost, and low system reliability. If low-voltage battery components are used, the bus current is large and the system design is complex, resulting in a larger device, higher cost, and low system reliability. Utility Model Content

[0004] The purpose of the utility model is to provide a high-power pulse degaussing power supply circuit and system, so as to solve the problems of high cost, large device volume and low reliability of the existing degaussing power supply system.

[0005] In order to solve the above technical problems, the utility model provides a high-power pulse demagnetization power supply circuit, which includes an energy storage unit, a transformer and an AC / DC converter, and also includes a four-quadrant DC / DC converter and a DC / DC converter; the DC side of the AC / DC converter is connected to one end of the four-quadrant DC / DC converter, and the other end of the four-quadrant DC / DC converter is used to connect to an inductive load; the energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the DC / DC converter.

[0006] Furthermore, the four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and N thyristors, where N≥2.

[0007] Furthermore, the four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and two groups of half-bridge DC / DC converters, and the half bridges of the two groups of half-bridge DC / DC converters are composed of fully controlled devices.

[0008] Furthermore, a bypass switch unit for short-circuiting the inductive load is provided between the four-quadrant DC / DC converter and the inductive load. The bypass switch unit includes M groups of thyristors connected in parallel in positive and negative phases, where M≥1.

[0009] Furthermore, each energy storage unit is provided with a corresponding DC / DC converter, and each energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the corresponding DC / DC converter.

[0010] Furthermore, a DC / DC converter is provided corresponding to each of the J energy storage units, and the J energy storage units are connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the corresponding DC / DC converter; J≥2.

[0011] Furthermore, the energy storage unit includes one or more of a battery pack, a supercapacitor and a flywheel energy storage.

[0012] The beneficial effects of the above technical solution are as follows: the utility model is an improved invention, in which the energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through a DC / DC converter, thereby decoupling the energy storage unit from the DC side of the AC / DC converter and the DC bus between the four-quadrant DC / DC converter, without the need to design complex high-voltage battery components or low-voltage battery components. In this way, different energy storage units can be connected, and multiple energy storage units can be flexibly configured according to actual requirements. Multiple energy storage units can also be used in combination, thereby improving the reliability of the demagnetization power supply and reducing the device volume and equipment cost.

[0013] To solve the above technical problems, the present invention also provides a high-power pulse demagnetization power supply system, including an energy storage unit, a transformer, an AC / DC converter and a controller, and also including a four-quadrant DC / DC converter and a DC / DC converter; the DC side of the AC / DC converter is connected to one end of the four-quadrant DC / DC converter, and the other end of the four-quadrant DC / DC converter is used to connect to an inductive load; the energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the DC / DC converter; the controller is used to coordinate and control the AC / DC converter, the four-quadrant DC / DC converter and the DC / DC converter.

[0014] Furthermore, the four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and N thyristors, where N≥2.

[0015] Furthermore, the four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and two groups of half-bridge DC / DC converters, and the half bridges of the two groups of half-bridge DC / DC converters are composed of fully controlled devices.

[0016] The beneficial effects of the above technical solution are as follows: the utility model is an improved invention, in which the energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through a DC / DC converter, thereby decoupling the energy storage unit from the DC side of the AC / DC converter and the DC bus between the four-quadrant DC / DC converter, without the need to design complex high-voltage battery components or low-voltage battery components. In this way, different energy storage units can be connected, and multiple energy storage units can be flexibly configured according to actual requirements. Multiple energy storage units can also be used in combination, thereby improving the reliability of the demagnetization power supply and reducing the device volume and equipment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a system topology block diagram of an embodiment of the high-power pulse degaussing power supply system of the utility model;

[0018] Figure 2This is an AC / DC converter topology diagram of an embodiment of the high-power pulse degaussing power supply system of the utility model;

[0019] Figure 3 This is a topological structure diagram of a DC / DC converter of an embodiment of a high-power pulse degaussing power supply system of the utility model;

[0020] Figure 4 This is a schematic diagram of the pulse current waveform output by the embodiment of the high-power pulse degaussing power supply system of the utility model;

[0021] Figure 5 This is a topological structure diagram of a four-quadrant DC / DC converter of an embodiment of the high-power pulse degaussing power supply system of the utility model;

[0022] Figure 6 This is another four-quadrant DC / DC converter topology diagram of an embodiment of the high-power pulse degaussing power supply system of the utility model;

[0023] Figure 7 This is a topological diagram of the bypass switch of an embodiment of the high-power pulse degaussing power supply system of the utility model. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clear, the specific implementation methods of the present invention are further described below with reference to the accompanying drawings.

[0025] The energy storage unit of the utility model is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through a DC / DC converter, thereby decoupling the energy storage unit from the DC side of the AC / DC converter and the DC bus between the four-quadrant DC / DC converter. There is no need to design a complex high-voltage battery assembly or a low-voltage battery assembly. In this way, different energy storage units can be connected. Multiple energy storage units can be flexibly configured according to actual requirements, and multiple energy storage units can also be used in combination, avoiding the shortcomings of a single form of energy storage unit, giving full play to the advantages of various energy storage forms, improving the reliability of the demagnetization power supply, and reducing the device size and equipment cost; the traditional chopper and reversing switch are integrated into a four-quadrant DC / DC converter, eliminating the traditional reversing switch part, greatly reducing the equipment size and cost, and simplifying the circuit.

[0026] High-power pulse degaussing power supply system embodiment

[0027] The utility model is a high-power pulse degaussing power supply system, such as Figure 1The circuit includes a controller and a high-power pulse degaussing power supply circuit. The high-power pulse degaussing power supply circuit includes an energy storage unit, a transformer, an AC / DC converter, a four-quadrant DC / DC converter, and a DC / DC converter. The DC side of the AC / DC converter is connected to one end of the four-quadrant DC / DC converter, and the other end of the four-quadrant DC / DC converter is used to connect to an inductive load. The energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the DC / DC converter.

[0028] The transformer is used to convert the high voltage of the mains electricity into the input voltage level required by the AC / DC converter, which is generally AC690V-AC800V. The AC / DC converter converts the three-phase AC power after the transformer steps down the voltage into DC power, which is responsible for providing energy to the DC bus and controlling the voltage of the DC bus. Figure 2 As shown, the AC / DC converter adopts ANPC three-level topology, T a1 -T a4 、T b1 -T b4 、T c1 -T c4 For IGBT tube, D a5 、D a6 、D b5 、D b6 、D c5 and D c6 The LCL filter is composed of diodes, La_INV, Lb_INV, and Lc_INV, inverter-side inductors, filter capacitors C1-C3, and grid-side inductors La_G, Lb_G, and Lc_G. Compared to two-level topologies, three-level topologies can output higher DC bus voltages and reduce current harmonics, minimizing their impact on the grid.

[0029] The energy storage unit provides the load with the required operating current to meet its operational needs. When the instantaneous power required by the load powered by the demagnetization power system reaches megawatts, relying solely on an AC / DC converter to supply it is insufficient. This not only places higher demands on the power system's power level and power supply capacity, but also introduces impacts and harmonic pollution to the power grid. Therefore, the power system's energy storage unit is connected to the system's DC bus via a DC / DC converter. The AC / DC converter and energy storage unit together supply power to the load, meeting its operating current requirements. This reduces the demand on grid capacity, meets the load's operating current requirements, and avoids impacts on the grid. Specifically, during the load charging stage, the AC power provides energy to the DC bus through the AC / DC converter, the energy storage unit provides energy to the DC bus through the DC / DC converter, and the four-quadrant DC / DC converter extracts energy from the DC bus to provide the required current for the load; during the load discharging stage, the four-quadrant DC / DC converter feeds the load's energy back to the DC bus. At this time, the DC / DC converter extracts energy from the DC bus to charge the energy storage unit, and the AC / DC converter feeds back the energy that the energy storage unit cannot absorb to the grid; in the intervals between load pulses, the AC / DC converter can use the grid energy to provide energy storage for the energy storage unit through the DC / DC converter, preparing for the next pulse current.

[0030] Each energy storage unit (energy storage unit #1-energy storage unit #n) can be equipped with a corresponding DC / DC converter (DC / DC converter #1-DC / DC converter #n). Each energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter via its corresponding DC / DC converter. By connecting different energy storage units #1-energy storage units #n in series with their corresponding DC / DC converters #1-DC / DC converter #n, the energy storage units are decoupled from the system's DC bus. Multiple energy storage units can also be equipped with a corresponding DC / DC converter. For example, J energy storage units can be equipped with a corresponding DC / DC converter, and J energy storage units are connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter via their corresponding DC / DC converters; J ≥ 2. Multiple energy storage units can be connected in parallel by connecting one or more DC / DC converters on the DC bus.

[0031] Energy storage units include one or more of battery packs, supercapacitors, and flywheels. These units can all be connected in parallel to the DC bus via a series DC / DC converter. Multiple energy storage units can be flexibly configured to meet specific requirements, and multiple units can be used in combination. Lithium iron phosphate (LiFePO4) battery packs offer the advantage of high discharge rates, making them a preferred choice for high capacity and fast response. However, large-capacity LiFePO4 battery packs suffer from a lower cycle life in frequent charge and discharge scenarios, and chemical energy storage requires additional safety measures in high-humidity and high-corrosion environments, significantly reducing overall system reliability. Supercapacitors can accommodate frequent charge and discharge scenarios and offer greater safety than chemical batteries, but their lower energy density limits their capacity. Cost and size are key constraints for large-capacity systems. Mechanical energy storage in flywheels offers greater safety than chemical energy storage, faster response times, and a moderate energy density, meeting typical system requirements. Each energy storage unit has its own advantages and disadvantages. By coordinating the capacities and characteristics of different energy storage units, the system's capacity, response speed, safety, and economy can be optimized, greatly improving the system's reliability and response speed and effectively reducing equipment costs.

[0032] The DC / DC converter converts the voltage and converts the DC bus voltage into a voltage and current suitable for the energy storage unit, thereby achieving energy management of the energy storage unit and controlling the charging and discharging of the energy storage unit. Figure 3 As shown in the figure, the DC / DC converter adopts a multi-interleaved parallel synchronous rectification half-bridge topology. in is the DC bus voltage input on the high-voltage side, C in is the input filter capacitor, S 11、 S 21 is a set of half-bridge switch tubes, S 12、 S 22 、S 13、 S 23 The outputs of the three groups of switch tubes are staggered in parallel to form a three-phase staggered half-bridge DC / DC circuit. The staggered method increases the output switching frequency and reduces the output inductance. L1, L2, and L3 are the output filter inductors corresponding to the three groups of switch tubes. C out is the output filter capacitor, V out The half-bridge DC / DC converter has the ability to flow energy in both directions, as long as the high-voltage side V in Ratio of low voltage side V out High can realize bidirectional charging and discharging, supplying the energy in the energy storage unit to the large inductive load, or storing the energy of the large inductive load in the energy storage unit.

[0033] A four-quadrant DC / DC converter provides energy to highly inductive loads, outputting alternating positive and negative pulsed current. It comprises a high-speed chopper half-bridge circuit unit and a low-speed commutation power unit. The high-speed chopper half-bridge circuit unit is a three-phase interleaved half-bridge DC / DC circuit that uses multiple interleaved parallel connections to control the output voltage and current. The low-speed commutation power unit controls the output voltage and current direction. The coordinated control of the two power units enables four-quadrant control of the output voltage and current. The low-speed commutation power unit can be implemented using fully controlled devices (such as IGBTs) with fewer bridges or lower current ratings than the high-speed chopper circuit, or using lower-cost thyristors. In other words, a four-quadrant DC / DC converter consists of a three-phase interleaved half-bridge DC / DC circuit and N thyristors, where N ≥ 2; or a four-quadrant DC / DC converter consists of a three-phase interleaved half-bridge DC / DC circuit and two half-bridge DC / DC converters, each half-bridge of which is composed of fully controlled devices.

[0034] In order to conveniently describe the working principle of the four-quadrant DC / DC converter, the form of the load pulse is divided. The divided pulse current waveform is as follows: Figure 4 As shown: T0 is the positive current rising stage, T1 is the positive current holding stage, T2 is the positive current falling stage, T3 is the stop stage, T4 is the negative current rising stage, T5 is the negative current holding stage, and T6 is the negative current falling stage.

[0035] In one embodiment, the four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and two thyristors, such as Figure 5 Shown: V in is the DC bus voltage input on the high-voltage side, C in is the input filter capacitor, S 11、 S 21 is a set of half-bridge switch tubes, S 12、 S 22 、S 13、 S 23 The outputs of the three groups of switch tubes are staggered in parallel, which increases the output switching frequency and reduces the output inductance. L1, L2, and L3 are the output filter inductors corresponding to the three groups of switch tubes. C out is the output filter capacitor, VT1 and VT2 are thyristors used as commutation switches, V out The output port is used to connect a load or bypass switch. By integrating the traditional DC / DC converter with the H-bridge commutation switch into a four-quadrant DC / DC converter, the traditional commutation switch is eliminated. The thyristor + half-bridge DC / DC converter method is used to realize the functions of the commutation switch and DC / DC converter, which greatly reduces the size and cost of the device and simplifies the control circuit. The principle of outputting positive and negative pulse current is as follows:

[0036] In the T0 stage, VT2 is triggered to turn on, VT1 is turned off, and the three half-bridge circuits work in the step-down state to charge the load, and the current rises in the positive direction.

[0037] In the T1 stage, VT2 is turned on and VT1 is turned off. The three half-bridge circuits work in a step-down state to keep the load current constant.

[0038] In the T2 stage, VT2 is turned on and VT1 is turned off. The three half-bridge circuits work in a step-down state, controlling the load current to decrease slowly and the current to decrease in the positive direction.

[0039] In the T3 phase, VT2 stops triggering. At the end of the T2 phase, the current on VT2 passes through zero, and the thyristor VT2 is naturally turned off. VT1 is turned off, and the three half-bridge circuits no longer work, and the load current is zero.

[0040] In the T4 stage, VT1 is triggered to turn on, VT2 is turned off, and the three half-bridge circuits work in the boost state, charging the load in reverse, and the current rises negatively.

[0041] In the T5 stage, VT1 is turned on, VT2 is turned off, and the three half-bridge circuits work in the boost state to keep the load current constant.

[0042] In the T6 stage, VT1 is turned on, VT2 is turned off, and the three half-bridge circuits work in the boost state, controlling the load current to rise slowly and the current to rise in the reverse direction.

[0043] At the end of the T6 phase, the current on VT1 passes through zero, and the thyristor VT1 is naturally turned off. VT2 is also turned off, and the three half-bridge circuits no longer work, and the load current is zero.

[0044] In another embodiment, the four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and a half-bridge DC / DC converter composed of two groups of IGBTs. By distinguishing between high-frequency chopping power modules and low-frequency commutation power modules, an asymmetric design is achieved. When the power modules are reused, the number of IGBTs used is reduced, effectively reducing the cost and size of the device. Figure 6 As shown, Figure 5 The VT1 and VT2 thyristors in the system are replaced with fully controlled devices such as IGBTs, i.e. 14、 S 24 is a set of half-bridge switch tubes, S 15、 S 25The two sets of switching tubes form a low-frequency commutation switch, which does not require interleaved control and can share materials and power modules with the half-bridge switching tube. Because it does not need to switch frequently and only needs to be turned on and off once in the entire pulse cycle, the switching loss of the commutation switch is very small, and fewer IGBT devices can be used than high-frequency tubes. In this embodiment, two sets of half-bridges can meet the design requirements. Its control method is similar to Figure 5 The thyristor control method in is similar and will not be explained here.

[0045] When a system failure occurs, the IGBT needs to be turned off in time. At this time, due to the large inductance characteristics of the load, if the IGBT of the four-quadrant DC / DC converter is turned off directly, a large current may exist on the load inductor. Since the inductor current cannot change suddenly, there is no freewheeling path for the inductor after the IGBT is turned off, which will cause a sudden rise in voltage on the inductor and cause the IGBT to fail due to overvoltage. Therefore, in order to ensure that the system can bypass the load in time when a failure occurs and prevent the load from damaging the equipment due to overvoltage, it is necessary to configure a bypass circuit at the output port of the power supply system to provide a commutation path for the load. Specifically, the utility model is also provided with a bypass switch unit for short-circuiting the inductive load between the four-quadrant DC / DC converter and the inductive load. The bypass switch unit includes M groups of positive and negative parallel thyristors to provide a bypass channel for the load, and M≥1. The number of thyristors is designed according to the circuit power, such as Figure 7 As shown, in this embodiment, M is 3, and the bypass switch unit includes three groups of thyristors connected in parallel in positive and negative phases. After each group of thyristors is connected in parallel, a resistor is connected in series for current limiting protection. The series resistors R1-R3 can adjust the current sharing characteristics of each group of thyristors, suppress the maximum current flowing through the thyristors, and protect the thyristors from damage. When the device needs to shut down the IGBT output, the thyristor of the bypass switch unit is first turned on to short-circuit the load, and then the IGBT is turned off. This ensures that there is a commutation path for large inductive loads and prevents overvoltage from damaging the equipment. By adding a bypass switch to the load port, the problem of equipment shutdown protection under abnormal working conditions such as equipment failure is solved. By short-circuiting the load through the bypass switch, the equipment is ensured not to be broken down by overvoltage. In addition, in scenarios with high dynamic requirements, the fall time of the pulse current can be accelerated by short-circuiting the load to meet the high dynamic regulation requirements of the engineering design.

[0046] The controller includes a DSP controller, voltage and current sampling circuits, an external synchronous control signal port, a CAN communication port, and an Ethernet communication port. It coordinates and controls the AC / DC converter, DC / DC converter, four-quadrant DC / DC converter, and bypass switch. It coordinates and controls the operating status of each converter, enabling synchronous control of multiple power supplies in parallel and communicating and monitoring with the host computer. Large inductive loads are replaced with equivalent RL series branches.

[0047] High-power pulse degaussing power supply circuit embodiment

[0048] The utility model provides a high-power pulse degaussing power supply circuit, which is the high-power pulse degaussing power supply circuit described in the above embodiment of the high-power pulse degaussing power supply system, and will not be described in detail here.

Claims

1. A high-power pulse degaussing power supply circuit, comprising an energy storage unit, a transformer and an AC / DC converter, characterized in that: It also includes a four-quadrant DC / DC converter and a DC / DC converter; the DC side of the AC / DC converter is connected to one end of the four-quadrant DC / DC converter, and the other end of the four-quadrant DC / DC converter is used to connect to the inductive load; the energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the DC / DC converter.

2. The high-power pulse degaussing power supply circuit according to claim 1, characterized in that: The four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and N thyristors, where N is greater than or equal to 2.

3. The high-power pulse degaussing power supply circuit according to claim 1, characterized in that: The four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and two groups of half-bridge DC / DC converters, wherein the half bridges of the two groups of half-bridge DC / DC converters are composed of fully controlled devices.

4. The high-power pulse degaussing power supply circuit according to any one of claims 1 to 3, characterized in that: A bypass switch unit for short-circuiting the inductive load is further provided between the four-quadrant DC / DC converter and the inductive load. The bypass switch unit includes M groups of thyristors connected in parallel in positive and negative phases, where M≥1.

5. The high-power pulse degaussing power supply circuit according to claim 1, characterized in that: Each energy storage unit is provided with a corresponding DC / DC converter, and each energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the corresponding DC / DC converter.

6. The high-power pulse degaussing power supply circuit according to claim 1, characterized in that: A DC / DC converter is correspondingly provided for each of the J energy storage units, and the J energy storage units are connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the corresponding DC / DC converter; J≥2.

7. The high-power pulse degaussing power supply circuit according to claim 1, characterized in that: The energy storage unit includes one or more of a battery pack, a supercapacitor and a flywheel energy storage.

8. A high-power pulse degaussing power supply system, comprising an energy storage unit, a transformer, an AC / DC converter and a controller, characterized in that: It also includes a four-quadrant DC / DC converter and a DC / DC converter; the DC side of the AC / DC converter is connected to one end of the four-quadrant DC / DC converter, and the other end of the four-quadrant DC / DC converter is used to connect to an inductive load; the energy storage unit is connected in parallel between the DC side of the AC / DC converter and the four-quadrant DC / DC converter through the DC / DC converter; and the controller is used to coordinate and control the AC / DC converter, the four-quadrant DC / DC converter, and the DC / DC converter.

9. The high-power pulse degaussing power supply system according to claim 8, characterized in that: The four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and N thyristors, where N is greater than or equal to 2.

10. The high-power pulse degaussing power supply system according to claim 8, characterized in that: The four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and two groups of half-bridge DC / DC converters, wherein the half bridges of the two groups of half-bridge DC / DC converters are composed of fully controlled devices.

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