High-power pulse degaussing power supply circuit and system

Abstract

The invention 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 invention belongs to the technical field of power electronic demagnetization, and in particular relates to a high-power pulse demagnetization power supply circuit and system. Background Art

[0002] Modern ships are huge ferromagnetic bodies with complex structures. Affected by geomagnetism, magnetic field shocks during construction and navigation, and stress shocks, magnetic fields are generated in the space around the ships, becoming an important source of threat to ships being attacked by magnetic probes and magnetic weapons. Therefore, it is necessary to demagnetize ships through a demagnetization system to improve the protection performance of ships. The demagnetization system is mainly composed of demagnetization control equipment, demagnetization power supply, and demagnetization coil. According to the instructions of the demagnetization control equipment, the demagnetization power supply outputs high-quality demagnetization current to the demagnetization coil, thereby offsetting the ship's own magnetic field. However, as the displacement of ships increases, the power demand of the demagnetization system is also increasing. The traditional demagnetization power supply directly obtains energy from the power grid to magnetize the demagnetization coil during the rising stage of the demagnetization current; in the stage of maintaining the demagnetization current, a large amount of energy is stored in the demagnetization coil, thereby demagnetizing the ship; in the stage of decreasing the demagnetization current, the energy on the demagnetization coil is converted into heat energy through resistance and dissipated, resulting in huge energy waste. In this scenario of frequent charging and discharging, 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 city power into the voltage level required by the three-phase rectifier circuit, the three-phase rectifier converts the three-phase AC power stepped down by the transformer into DC power. In the rising stage of the pulse current, it supplies power to the large inductive load together with the battery energy storage device. When the pulse current is in the pulse gap, it supplies power to the subsequent battery energy storage device, thereby 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. Summary of the invention

[0004] The object of the present invention is to provide a high-power pulse degaussing power supply circuit and system to solve the problems of high cost, large device size and low reliability of the existing degaussing power supply system.

[0005] In order to solve the above technical problems, the present invention 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 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.

[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, and the bypass switch unit includes M groups of thyristors connected in parallel in positive and negative phases, where M≥1.

[0009] Furthermore, a DC / DC converter is correspondingly arranged for each energy storage unit, 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, one 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 present invention 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 a complex high-voltage battery assembly or a low-voltage battery assembly, and in this way, different energy storage units can be connected, a variety of energy storage units can be flexibly configured according to actual requirements, and 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] In order 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 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; 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 present invention 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 a complex high-voltage battery assembly or a low-voltage battery assembly, and in this way, different energy storage units can be connected, a variety of energy storage units can be flexibly configured according to actual requirements, and 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 It is a system topology block diagram of an embodiment of a high-power pulse degaussing power supply system of the present invention; Figure 2 It is a topological structure diagram of an AC / DC converter of an embodiment of a high-power pulse degaussing power supply system of the present invention; Figure 3 It is a DC / DC converter topology diagram of an embodiment of a high-power pulse degaussing power supply system of the present invention; Figure 4 Schematic diagram of the pulse current waveform outputted by the high-power pulse degaussing power supply system embodiment of the present invention; Figure 5 It is a topological structure diagram of a four-quadrant DC / DC converter of an embodiment of a high-power pulse degaussing power supply system of the present invention; Figure 6 It is another four-quadrant DC / DC converter topology diagram of the embodiment of the high-power pulse degaussing power supply system of the present invention; Figure 7 It is a bypass switch topology diagram of an embodiment of a high-power pulse demagnetization power supply system of the present invention. DETAILED DESCRIPTION

[0018] 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 in conjunction with the accompanying drawings.

[0019] The energy storage unit of the present invention is connected in parallel to 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 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.

[0020] High-power pulse degaussing power supply system embodiment A high-power pulse degaussing power supply system of the present invention, such as Figure 1 As shown: it includes a controller and a high-power pulse demagnetization power supply circuit, and the high-power pulse demagnetization 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. Among them, 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 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.

[0021] The transformer is used to convert the high voltage of the mains 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, and 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 three-level topology can output a higher DC bus voltage than the two-level topology, and the three-level technology can reduce current harmonics and reduce the impact on the grid.

[0022] The energy storage unit provides the required working current for the load to meet the working requirements of the load; when the instantaneous power required by the load powered by the demagnetization power supply system reaches the megawatt level, the AC / DC converter alone cannot meet the power level required by the load, which will not only put forward higher requirements on the power level and power supply capacity of the power supply system, but also bring impact and harmonic pollution to the power grid. Therefore, the energy storage unit of the power supply system is connected to the DC bus of the system through the DC / DC converter, and the load is powered by the AC / DC converter and the energy storage unit together to meet the working current requirements of the load, thereby reducing the demand for grid capacity, meeting the working current requirements of the load, and avoiding impact on the grid. Specifically, in 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; in the load discharging stage, the four-quadrant DC / DC converter feeds the energy of the load 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 gap 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, and prepare for the next pulse current.

[0023] Each energy storage unit (energy storage unit #1-energy storage unit #n) can be provided with a corresponding DC / DC converter (DC / DC converter #1-DC / DC converter #n), 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. The energy storage unit and the DC bus of the system are decoupled by connecting the corresponding DC / DC converter #1-DC / DC converter #n in series with different energy storage units #1-energy storage units #n. A DC / DC converter can also be provided for multiple energy storage units, such as J energy storage units corresponding to a 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 through the corresponding DC / DC converter; J ≥ 2. Multiple groups of energy storage units can be connected by connecting one or more DC / DC converters in parallel on the DC bus.

[0024] The energy storage unit includes one or more of battery packs, supercapacitors and flywheel energy storage. The battery packs, flywheel energy storage and supercapacitors can be connected in parallel with the DC bus after the DC / DC converter is connected in series. A variety of energy storage units can be flexibly configured according to actual requirements, and multiple energy storage units can also be used in combination. Among them, the lithium iron phosphate battery pack has the advantage of high discharge rate, so the battery pack preferably uses a lithium iron phosphate battery pack to achieve high capacity and fast response. However, the cycle life of a large-capacity lithium iron phosphate battery pack is low in the scenario of frequent charging and discharging, and the safety of chemical energy storage in high humidity and high corrosion scenarios requires more methods to ensure, which will greatly reduce the reliability of the entire system. Supercapacitors can adapt to frequent charging and discharging scenarios, and their safety is higher than that of chemical batteries, but their energy density is low, and the capacity cannot be made very large. The cost and volume of the system under large capacity are the key points that restrict it. The mechanical energy storage method in flywheel energy storage is safer than chemical energy storage, has a faster response speed during operation, and has a moderate energy density, which can meet conventional system requirements. Each energy storage unit has its own advantages and disadvantages. By combining 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.

[0025] 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 realizing 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 multiple 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, S12、 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 to 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.

[0026] The four-quadrant DC / DC converter is responsible for providing energy to the large inductive load and outputting positive and negative alternating pulse current. It includes 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. It realizes the magnitude control of the output voltage and current through multiple interleaved parallel technology, and realizes the direction control of the output voltage and current through the low-speed commutation power unit. Through the coordinated control of two groups of power units, the four-quadrant control of the output voltage and current is realized. The low-speed commutation power unit can be realized by using fully controlled devices (such as IGBT) with fewer or lower current specifications than the high-speed chopper board bridge, or by using thyristors with lower costs. That is, the four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and N thyristors, N≥2; or 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.

[0027] In order to conveniently describe the working principle of the four-quadrant DC / DC converter, the load pulse form is divided into the following pulse current waveforms: 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 stopping stage, T4 is the negative current rising stage, T5 is the negative current holding stage, and T6 is the negative current falling stage.

[0028] 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, S12、 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 It is the output port for connecting load or bypass switch. By integrating the traditional DC / DC converter and H-bridge commutation switch into a four-quadrant DC / DC converter, the traditional commutation switch part is omitted, and the thyristor + half-bridge DC / DC converter is used to realize the functions of commutation switch and DC / DC converter, which greatly reduces the size and cost of the equipment and simplifies the control circuit. The principle of outputting positive and negative pulse current is: 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.

[0029] In the T1 stage, VT2 is turned on, VT1 is turned off, and the three half-bridge circuits work in a step-down state to keep the load current constant.

[0030] In the T2 stage, VT2 is turned on, VT1 is turned off, and 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.

[0031] In the T3 stage, VT2 stops triggering, and at the final moment of the T2 stage, the current on VT2 passes through zero, and the thyristor VT2 is naturally turned off. VT1 is turned off, and the three sets of half-bridge circuits no longer work, and the load current is zero.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] At the final moment of the T6 phase, the current on VT1 passes through zero, and the thyristor VT1 is naturally turned off. VT2 is turned off, and the three sets of half-bridge circuits no longer work, and the load current is zero.

[0036] 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 25 The two groups of switch tubes form a low-frequency commutation switch, which does not need to be staggered and can share materials and power modules with the half-bridge switch tube. Because it does not need to be switched frequently, it only needs to be turned on and off once in the entire pulse cycle, so 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 groups of half-bridges can meet the design requirements. Its control method is similar to Figure 5 The thyristor control method is similar and will not be explained here.

[0037] When a system failure occurs, the IGBT needs to be turned off in time. At this time, due to the large inductance of the load, if the IGBT of the four-quadrant DC / DC converter is directly turned off, 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 IGBT failure 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 present invention also provides 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, where M≥1. The number of thyristors is designed according to the circuit power, such as Figure 7As shown, in this embodiment, M is 3, and the bypass switch unit includes 3 groups of positive and negative thyristors connected in parallel. 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 that overvoltage will not occur to damage 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. The load is short-circuited by the bypass switch to ensure that the equipment will not be broken down by overvoltage. In addition, in scenarios with high dynamic requirements, the pulse current fall time can be accelerated by short-circuiting the load to meet the high dynamic regulation requirements of engineering design.

[0038] The controller has a DSP controller, a voltage and current sampling circuit, an external synchronous control signal port, a CAN communication port and an Ethernet communication port. It is responsible for coordinating and controlling the AC / DC converter, the DC / DC converter, the four-quadrant DC / DC converter and controlling the bypass switch. It is responsible for coordinating and controlling the working state of each converter, realizing the synchronous control of multiple power supplies in parallel, and communicating and monitoring the host computer. Large inductive loads are replaced by equivalent RL series branches.

[0039] High-power pulse degaussing power supply circuit embodiment A high-power pulse degaussing power supply circuit of the present invention is the high-power pulse degaussing power supply circuit described in the above-mentioned high-power pulse degaussing power supply system embodiment, which 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 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 is characterized in that: The four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and N thyristors, where N≥2.

3. The high-power pulse degaussing power supply circuit according to claim 1 is characterized in that: The four-quadrant DC / DC converter comprises 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 also provided between the four-quadrant DC / DC converter and the inductive load, and 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 is characterized in that: A DC / DC converter is correspondingly arranged for each energy storage unit, 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 is characterized in that: One DC / DC converter is correspondingly arranged 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 is 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 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; 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 is characterized in that: The four-quadrant DC / DC converter includes a three-phase interleaved half-bridge DC / DC circuit and N thyristors, where N≥2.

10. The high-power pulse degaussing power supply system according to claim 8, characterized in that: The four-quadrant DC / DC converter comprises 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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