A distributed modular multi-phase inverter device and topology reconfiguration method

Abstract

The application discloses a kind of distributed modular multiphase inverter device and topology reconstruction method, device includes control board, adapter board, position sensor board, multiple drive boards, bottom plate and DC bus board, control board is transmitted PWM control signal to each drive board via adapter board and receives current sampling signal, position sensor board feeds back motor position and speed signal to control board;Four drive boards include three-phase half-bridge bridge arms respectively, each half-bridge bridge arm has midpoint output end, positive end and negative end;Bottom plate is fixed with DC bus board and is electrically connected, DC bus board is set with corresponding phase line connection end and DC bus connection end of each half-bridge bridge arm.By changing the connection relationship between each wiring area, positive bus and negative bus, a double three-phase, open-winding and three-level motor drive topology can be constructed on the same hardware platform, and fault simulation, fault-tolerant control and current reconstruction can be performed with current sampling and position feedback, reducing the amount of topology switching and hardware iteration modification.

Description

Technical Field

[0001] This invention belongs to the field of power electronics and motor control technology, specifically relating to a distributed modular multiphase inverter device and topology reconfiguration method for a multiphase permanent magnet motor drive system. Background Technology

[0002] Multiphase permanent magnet motors (PMMs) are characterized by high power density, strong fault tolerance, and low torque ripple, making them suitable for applications in industrial automation, new energy vehicles, robotics, and aerospace. As the power conversion link between DC and multiphase AC power, the inverter's structure directly affects the topology adaptability, maintenance convenience, and experimental verification efficiency of the PPM drive system.

[0003] Most existing multiphase inverters adopt a relatively fixed centralized hardware structure. This type of structure can complete drive control under a specific number of phases or a specific topology, but when it is necessary to switch between three-phase, six-phase, nine-phase, twelve-phase, open-winding, or three-level topologies, it is usually necessary to rebuild the power circuit, modify the bus connection, or replace many hardware modules, resulting in a long commissioning cycle, complex wiring relationships, and increased costs for incorrect wiring and maintenance.

[0004] Furthermore, in multiphase motor fault-tolerant control, open-circuit fault simulation, current reconfiguration, and multi-motor parallel experiments, researchers often need to frequently adjust the bridge arm combination relationship and sampling feedback relationship. If the inverter's bridge arms, control interface, and DC bus connection method lack modular design, it is difficult to quickly complete topology reconfiguration on the same hardware platform, and it is also not conducive to module replacement, functional expansion, and subsequent iteration. Therefore, it is necessary to provide a multiphase inverter device that can achieve multiple drive topology switching through modular bridge arms and reconfigurable wiring structure. Summary of the Invention

[0005] To address the problems of existing multiphase inverter topology switching relying on complete hardware modifications, inflexible bridge arm combinations, and inconvenient maintenance and iteration, this invention provides a distributed modular multiphase inverter device and topology reconfiguration method. This device uses a layered modular connection of a control board, adapter board, position sensor board, drive board, base plate, and DC bus board to lead multiple half-bridge arms to the DC bus board. A terminal connection mapping relationship is formed according to the target drive topology, and this mapping relationship is converted into a conductive connection pattern on the DC bus board, enabling different target drive topologies to be implemented by configuring, processing, or replacing the corresponding DC bus board.

[0006] To achieve the above-mentioned objectives, the technical solution adopted by this invention is as follows:

[0007] A distributed modular multiphase inverter device includes a control board, an adapter board, a position sensor board, multiple drive boards, a base plate, and a DC bus board. The control board is mounted on the base plate and transmits control signals and current sampling signals to the drive boards via the adapter board. The position sensor board is connected to the control board to transmit rotor position and motor speed signals. The multiple drive boards are detachably connected to the base plate, each drive board including multiple half-bridge arms and outputting corresponding phase voltages according to the PWM control signals output by the control board. The base plate and the DC bus board are fixed to each other and electrically connected. The DC bus board has multiple wiring areas corresponding to each half-bridge arm, each wiring area including a phase line connection terminal and a DC bus connection terminal. The phase line connection terminals and DC bus connection terminals of each half-bridge arm can be combined into different multiphase motor drive topologies by changing the external wiring method.

[0008] In the above technical solution, the control board includes a key input module, a DAC output and ADC input module, a power input / output module, a power conversion module, a communication module, and a position sensor interface module. The key input module is used to input start, stop, or topology switching control commands. The DAC output and ADC input module is used to transmit analog signals from the motor drive system. The power input / output module is used to supply power to the control board and the adapter board. The power conversion module is used to convert the external input power into the operating voltage required by the signal processing circuit in the control board. The communication module and the position sensor interface module are respectively connected to the motor communication interface and the position sensor to receive communication signals and motor rotor position feedback signals.

[0009] In the above technical solution, the adapter board is provided with capacitors, resistors and multiple female connectors. The capacitors and resistors are used to condition the control signal or current sampling signal, and the multiple female connectors are used to connect the signal transmission wires between the control board and the driver board.

[0010] In the above technical solution, the position sensor board is provided with pin headers, and the rotary transformer module of the control board is provided with pin headers corresponding to the pin headers. The position sensor board and the control board are connected through the pin headers and pin headers, thereby transmitting rotor position and motor speed signals to the control board.

[0011] In the above technical solution, the driver board includes a digital isolator module, a driver board power supply module, and a power switch module; the digital isolator module is equipped with a digital isolator for isolating the low-voltage signal of the control circuit from the high-voltage circuit where the power switch module is located; the driver board power supply module supplies power to the digital isolator module and the power switch module respectively; the power switch module includes IGBTs and outputs the phase voltage of the corresponding half-bridge arm through the output interface.

[0012] In the above technical solution, the base plate is provided with an input interface corresponding to the output interface of the drive board, a high-current terminal block, and a filter capacitor. Near the high-current terminal block, there is a connection hole for fixed connection with the DC bus board, so that the base plate and the DC bus board can be mechanically fixed and electrically connected by fasteners. The filter capacitor is used to store energy. The area around the connection hole is divided into a wiring area, which is used to connect the motor phase wire, the positive terminal Pdc of the DC bus, and the negative terminal Ndc of the DC bus.

[0013] In the above technical solution, there are four drive boards, each drive board includes three half-bridge arms, and each half-bridge arm includes a positive terminal, a negative terminal and a midpoint output terminal; the DC bus board correspondingly forms twelve DC bus positive terminals, twelve DC bus negative terminals and twelve midpoint output terminals, which are selectively connected to form a two-level multiphase inverter, an H-bridge inverter, a dual three-phase open winding inverter and an active neutral point clamped three-level inverter.

[0014] A method for topology reconfiguration using the aforementioned distributed modular multiphase inverter device includes: selecting a target wiring area from multiple wiring areas of the DC bus board according to the target drive topology; connecting the phase connection terminal of the target wiring area to the motor winding terminal; connecting the DC bus connection terminal of the target wiring area to the positive or negative terminal; isolating unused wiring areas; generating a corresponding PWM control signal based on the formed target drive topology using the control board; and outputting the signal to the corresponding half-bridge arm via the adapter board and the drive board.

[0015] Furthermore, it also includes: the control board performs open-circuit fault simulation or fault-tolerant control based on the current sampling signal, rotor position and motor speed signal: in the fault simulation state, the control board simulates inverter open-circuit fault or motor winding related fault by changing the control signal of the corresponding half-bridge arm or isolating the corresponding wiring area, and performs current reconstruction based on the remaining phase current sampling signal.

[0016] Furthermore: When the target drive topology is an H-bridge inverter topology, select two half-bridge arms, connect the positive ends of the two half-bridge arms to Pdc, and connect the negative ends of the two half-bridge arms to Ndc. Use the midpoint output terminals of the two half-bridge arms as either the load or the two ends of a single-phase winding. When the target drive topology is a dual three-phase open-winding inverter topology, taking a six-phase inverter as an example, select six half-bridge arms to form the first three-phase arm group and the second three-phase arm group. Connect the midpoint output terminals of the first three-phase arm group to one end of each three-phase winding, and connect the midpoint output terminals of the second three-phase arm group to... Do not connect to the other end of the three-phase winding; when the target drive topology is an active neutral point clamped three-level inverter topology, select three half-bridge arms to form a three-level phase bridge arm, connect the positive end of the first half-bridge arm to Pdc, connect the negative end of the first half-bridge arm and the positive end of the third half-bridge arm to Mdc, connect the negative end of the third half-bridge arm to Ndc, connect the positive and negative ends of the second half-bridge arm to the midpoint output terminals of phases A and C of the three-level phase bridge arm respectively, and use the midpoint output terminal of phase B of the three-level phase bridge arm as the phase output terminal, where Mdc is the DC bus midpoint.

[0017] The beneficial effects of this invention are:

[0018] 1) This invention concentrates the terminal conduction relationships of different target driving topologies into a DC bus board. Users can draw schematic diagrams, form PCB conductive patterns and prepare corresponding DC bus boards based on the terminal connection mapping relationship, thereby completing topology switching while maintaining the commonality of control board, adapter board, position sensor board, drive board and baseboard.

[0019] 2) This invention uses a combination structure of multiple driver boards, baseboards and DC bus boards to transform multiple half-bridge arms into selectable wiring areas, so that topology switching with different phase numbers and different level structures is mainly completed through wiring relationships, reducing the need for re-fabrication of boards or overall modification.

[0020] 3) This invention adopts a layered modular structure of control board, adapter board, position sensor board and driver board. Each functional board can be disassembled, replaced or upgraded independently, which facilitates fault maintenance and subsequent iteration.

[0021] 4) The present invention fixes the base plate and the DC bus plate together with connecting holes and fasteners, and divides the DC bus plate into multiple wiring areas, so that the connection positions of the motor phase lines and the DC bus lines are clearly corresponding, reducing the complexity of multi-bridge arm wiring and debugging.

[0022] 5) This invention, in conjunction with current sampling, position feedback, isolation drive, and PWM output of the control board, can support test scenarios such as multi-motor parallel experiments, fault simulation, fault-tolerant control, and current reconstruction, thereby improving the reusability of the same hardware platform. Attached Figure Description

[0023] Figure 1 This is a structural diagram of the distributed modular multiphase inverter device of the present invention;

[0024] Figure 2 This is a side view of the distributed modular multiphase inverter device of the present invention;

[0025] Figure 3 This is a physical diagram of the distributed modular multiphase inverter device of the present invention;

[0026] Figure 4 This is a technical architecture and overall system framework diagram of the distributed modular multiphase inverter of the present invention;

[0027] Figure 5 This is the overall structural layout diagram of the DC busbar in its initial state;

[0028] Figure 6 This is a schematic diagram of the distributed modular multiphase inverter topology reconfiguration method of the present invention;

[0029] Figure 7 This is a schematic diagram of the topology reconfiguration connection of the two-level twelve-phase inverter of the present invention;

[0030] Figure 8 This is a physical diagram of a two-level twelve-phase DC busbar designed based on terminal reconnection relationships.

[0031] Figure 9 A schematic diagram of the topology reconfiguration connections for a six-phase full-bridge inverter;

[0032] Figure 10 A schematic diagram of the topology reconfiguration connections for a six-phase open-winding inverter.

[0033] Figure 11 A schematic diagram of the topology reconfiguration connection for a four-phase active neutral point clamp (ANPC) three-level inverter;

[0034] In the diagram, 1-control board, 2-adapter board, 3-position sensor board, 4-drive board, 5-base plate, 6-DC bus board, 7-conductive post, 8-outgoing terminal. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0036] like Figures 1 to 3As shown, the distributed modular multiphase inverter device in this embodiment includes a control board 1, an adapter board 2, a position sensor board 3, multiple drive boards 4 (four in this embodiment), a base plate 5, and a DC bus board 6. The control board 1, adapter board 2, position sensor board 3, and drive boards 4 are mounted or connected to the base plate 5. The base plate 5 and the DC bus board 6 below it are fixed by screws or other fasteners. Conductive posts 7 are provided between the base plate 5 and the DC bus board 6. The DC bus board 6 is used to centrally arrange the phase line connection terminals and the DC bus connection terminals (i.e.,... Figure 2 The output terminal 8 shown in the diagram enables the outputs of each half-bridge arm to be combined using external wiring.

[0037] like Figure 4 As shown, the technical architecture of this invention unfolds according to the control layer, signal conversion layer, drive execution layer, and DC bus reconfiguration layer: the control board 1 receives current sampling signals (samples the output of each phase of the inverter through an external current sensor connected to the conversion board 2), motor rotor position feedback signals, and communication signals (communication signals between the host computer and the motor), and generates PWM control signals; the conversion board 2 completes the conversion of control signals and current sampling signals, and the four drive boards 4 respectively convert the control signals into the power output of each half-bridge minimum module (i.e., each half-bridge arm), and the base plate 5 and DC bus board 6 uniformly lead out the terminals corresponding to the twelve half-bridge minimum modules (i.e., A1, B1, C1 to A4, B4, C4) and reconnect them according to the target topology.

[0038] Control board 1, as the control core, includes a key input module, a DAC output and ADC input module, a power input / output module, a power conversion module, a communication module, and a position sensor interface module. The key input module is used to input start, stop, or topology switching control commands. The DAC output and ADC input modules are used to transmit analog signals from the motor drive system. The power input / output module supplies power to control board 1 and adapter board 2. The power conversion module converts external power input into the operating voltage required by the signal processing circuits in control board 1. The communication module and position sensor interface module are connected to the motor communication interface and position sensor, respectively, to receive communication signals and motor rotor position feedback signals. Control board 1 can employ a DSP main control unit, such as the TMS320F28377S, to generate multiple PWM control signals, process position sensor feedback signals, acquire phase current and bus voltage, and execute corresponding control strategies based on the target drive topology (or the number of phases of the target motor).

[0039] Adapter board 2 is used for signal conversion and conditioning between control board 1 and driver board 4. Adapter board 2 is equipped with capacitors, resistors, and multiple female connectors. The capacitors and resistors are used to condition the control signals or current sampling signals, and the female connectors are used to connect the signal transmission wires between control board 1 and driver board 4. The PWM control signal output by control board 1 is connected to the corresponding driver board 4 via adapter board 2, thereby reducing the complexity of direct wiring between control board 1 and multiple driver boards 4.

[0040] The position sensor board 3 is connected to the position sensor interface module on the control board ① via pin headers. Taking a rotary transformer as the position sensor interface module as an example, the position sensor board 3 transmits the motor speed and rotor position calculated by the rotary transformer decoding chip to the control board 1 through the communication interface, enabling the control board ① to complete closed-loop control.

[0041] The driver board 4 is detachably connected to 5 and includes a digital isolator module, a driver board power supply module, and a power switch module. The digital isolator module, which can be a digital isolator, is used to isolate the low-voltage signals of the control circuit from the high-voltage circuit where the power switch module is located. The driver board power supply module supplies power to the digital isolator module and the power switch module. The power switch module includes IGBTs, which receive the isolated control signals and output the phase voltage of the corresponding bridge arm. The driver board 4 can also be configured with status or fault handling signals such as RDY, FLT, and RST so that the control board 1 can monitor the drive status.

[0042] The base plate 5 is used to fix the control board 1 and the drive board 4, and provides the output interface, high current terminal and filter capacitor of the drive board 4. The filter capacitor is used to store energy and reduce bus voltage fluctuation. There are connection holes near the high current terminal for fixed connection with the DC bus plate 6, so that the base plate 5 and the DC bus plate 6 can be mechanically fixed and electrically connected by fasteners. The connection holes of the base plate 5 and the connection holes of the DC bus plate 6 are arranged correspondingly. After the two are connected by screws and other fasteners, the bridge arm output of the drive board 4 can be transmitted to the phase line connection terminal and the DC bus connection terminal on the DC bus plate 6.

[0043] Combination Figure 3 and Figure 5 The DC bus plate 6 is divided into twelve wiring areas around the connection holes, namely A1 to A4, B1 to B4, and C1 to C4. Each wiring area is associated with a corresponding half-bridge arm and is equipped with a phase wire connection terminal, a DC bus positive terminal connection position, and a DC bus negative terminal connection position. Each wiring area can be connected to the motor phase wire and the DC bus through copper tube lug terminals, screws, or other high-current connectors. Figure 5 The correspondence between the DC bus 6 and the thirty-six terminals is further shown in the initial state.

[0044] like Figure 5 As shown, to facilitate the explanation of the topology reconfiguration wiring relationship of the DC bus board 6, any half-bridge minimum module of the driver board 4 is denoted as Xk, where X is any phase among A, B, and C, and k is any driver board number among 1, 2, 3, and 4. The half-bridge minimum module Xk includes a positive terminal XkP, a negative terminal XkN, and a midpoint output terminal XkO, where the letter O represents the output terminal. Therefore, twelve half-bridge minimum modules form twelve positive terminals, twelve negative terminals, and twelve midpoint output terminals, for a total of thirty-six wireable terminals. The DC bus board 6 correspondingly forms twelve DC bus positive terminals, twelve DC bus negative terminals, and twelve midpoint output terminals. The DC bus positive terminals are denoted as Pdc, the DC bus negative terminals as Ndc, and the DC bus midpoint used in the three-level topology as Mdc.

[0045] When designing the DC bus board 6, a terminal connection mapping relationship is first established based on the target driving topology. This terminal connection mapping relationship includes terminal groups that need to be connected and terminal groups that need to be isolated. Then, the terminal connection mapping relationship is converted into the schematic connection network and PCB conductive pattern of the DC bus board 6. Finally, the DC bus board 6 corresponding to the target driving topology is fabricated and connected to the base plate 5. Thus, the hardware differences between different topologies are concentrated on the DC bus board 6, while the control board 1, adapter board 2, position sensor board 3, drive board 4, and base plate 5 can remain interchangeable.

[0046] like Figure 6 As shown, the topology reconfiguration process includes target topology determination, half-bridge minimum module selection, terminal connection mapping generation, conversion of DC bus board 6 schematic diagram and PCB conductive pattern, DC bus board 6 assembly, and control strategy matching. This process allows topology differences to be expressed in the form of terminal connection networks, enabling users to directly draw schematic diagrams and form corresponding PCBs based on the illustrated connection relationships. This allows for the creation or replacement of specific DC bus boards 6 to achieve different inverter topologies.

[0047] like Figure 7 As shown, when the target drive topology is a two-level twelve-phase inverter topology, the positive terminals of the twelve half-bridge minimum modules are connected to Pdc, and the negative terminals of the twelve half-bridge minimum modules are connected to Ndc. A1O, B1O, C1O to A4O, B4O, C4O are used as the twelve-phase output terminals. For three-phase, six-phase, or nine-phase two-level topologies, [further details can be added]. Figure 7 In the terminal connection rules shown, select the corresponding number of half-bridge minimum modules for connection, and keep the remaining unused terminals isolated. For example... Figure 8 As shown, based on Figure 7 The terminal reconnection relationship can be used to prepare a physical two-level twelve-phase DC bus board, so that the terminal connection mapping relationship is solidified into the PCB conductive path and the connection position of high current terminals.

[0048] like Figure 9 As shown, when the target drive topology is a six-phase full-bridge inverter topology, the twelve half-bridge minimum modules can be combined in pairs to form six H-bridge units. Taking A1 and B1 forming an H-bridge unit as an example, A1P and B1P are connected to Pdc, A1N and B1N are connected to Ndc, and the two ends of the load or single-phase winding are connected to A1O and B1O respectively; the remaining half-bridge minimum modules are combined according to the same rules. Therefore, Figure 9 The six-phase full-bridge topology shown can be achieved by reconnecting the terminals on the DC bus 6, while the control board 1, drive board 4 and base plate 5 remain interchangeable.

[0049] like Figure 10 As shown, when the target drive topology is a six-phase open-winding inverter topology, six half-bridge minimum modules are selected to form two groups of three-phase bridge arms. For example, A1, B1, and C1 are selected as the first three-phase bridge arm group, and A2, B2, and C2 are selected as the second three-phase bridge arm group. A1O, B1O, and C1O are connected to one end of the three-phase winding, and A2O, B2O, and C2O are connected to the other end of the three-phase winding. The positive and negative terminals of each half-bridge minimum module can be connected to the same DC bus, or they can be connected to mutually isolated DC power supplies according to experimental requirements. Figure 10 The wiring relationships in the diagram correspond to the conductive connections on the PCB of the DC bus board 6.

[0050] like Figure 11 As shown, when the target drive topology is an Active Neutral Point Clamped (ANPC) three-level inverter topology, each phase can select three half-bridge minimum modules to form a three-level phase bridge arm. Taking A1, B1, and C1 as one phase bridge arm as an example, connect A1P to Pdc, connect A1N and C1P to Mdc, connect C1N to Ndc, connect B1P to A1O, connect B1N to C1O, and use B1O as the phase output terminal UO. If a four-phase or multi-phase ANPC three-level inverter needs to be constructed, it can be configured as follows: Figure 11 The terminal reconnection rule shown applies to the same configuration for other phase bridge arms.

[0051] For the minimum half-bridge module that is not involved in the current topology reconfiguration, its corresponding positive, negative and midpoint output terminals should be insulated and isolated on the DC bus board 6 or kept in a preset safe connection state to avoid unused terminals being mistakenly connected to Pdc, Ndc, Mdc or motor phase lines.

[0052] pass Figures 7 to 11 It can be seen that the differences between different target topologies are mainly reflected in the conduction, parallel connection or isolation relationship between the terminals on the DC bus board 6; therefore, after determining the target topology, wiring guidelines, schematic network and PCB routing scheme can be directly formed based on the corresponding attached diagram, and the topology reconstruction can be completed by processing the corresponding DC bus board 6.

[0053] Furthermore, in fault simulation and fault-tolerant control scenarios, control board 1 can change the control signal of the corresponding bridge arm according to the target fault type, or isolate the corresponding wiring area to simulate inverter open-circuit faults or motor winding-related faults. Combining the phase current signal collected by the current sensor and the rotor position and motor speed signals fed back by the position sensor board 3, control board 1 can execute fault-tolerant control or current reconstruction algorithms, thus providing an experimental platform for multiphase motor fault diagnosis and fault-tolerant control research.

[0054] The above embodiments are only used to illustrate the design concept and features of the present invention, and their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. Therefore, all equivalent changes or modifications made based on the principles and design ideas disclosed in the present invention are within the protection scope of the present invention.

Claims

1. A distributed modular multiphase inverter device, characterized in that, The system includes a control board (1), an adapter board (2), a position sensor board (3), multiple drive boards (4), a base plate (5), and a DC bus board (6). The control board (1) is mounted on the base plate (5) and transmits control signals and current sampling signals to the drive boards (4) via the adapter board (2). The position sensor board (3) is connected to the control board (1) to transmit rotor position and motor speed signals. The multiple drive boards (4) are detachably connected to the base plate (5). Each drive board (4) includes multiple half-bridge arms and outputs corresponding phase voltages according to the PWM control signal output by the control board (1); the base plate (5) is fixed to the DC bus board (6) and electrically connected; the DC bus board (6) is provided with multiple wiring areas corresponding to each half-bridge arm, each wiring area includes a phase line connection end and a DC bus connection end, wherein the phase line connection end and the DC bus connection end of each half-bridge arm can be combined into different multi-phase motor drive topologies by changing the external wiring method.

2. The distributed modular multiphase inverter device according to claim 1, characterized in that, The control board (1) includes a key input module, a DAC output and ADC input module, a power input and output module, a power conversion module, a communication module, and a position sensor interface module. The key input module is used to input start, stop, or topology switching control commands. The DAC output and ADC input module is used to transmit analog signals of the motor drive system. The power input and output module is used to supply power to the control board (1) and the adapter board (2). The power conversion module is used to convert the external input power into the working voltage required by the signal processing circuit in the control board (1). The communication module and the position sensor interface module are connected to the motor communication interface and the position sensor, respectively, and are used to receive communication signals and motor rotor position feedback signals.

3. The distributed modular multiphase inverter device according to claim 1, characterized in that, The adapter board (2) is equipped with capacitors, resistors and multiple female connectors. The capacitors and resistors are used to condition the control signal or current sampling signal, and the multiple female connectors are used to connect the signal transmission wires between the control board (1) and the drive board (4).

4. The distributed modular multiphase inverter device according to claim 2, characterized in that, The position sensor board (3) is provided with pin headers, and the rotary transformer module of the control board (1) is provided with pin headers corresponding to the pin headers. The position sensor board (3) and the control board (1) are connected through the pin headers and pin headers, thereby transmitting rotor position and motor speed signals to the control board (1).

5. The distributed modular multiphase inverter device according to claim 1, characterized in that, The driver board (4) includes a digital isolator module, a driver board power supply module, and a power switch module; the digital isolator module is equipped with a digital isolator to isolate the low-voltage signal of the control circuit from the high-voltage circuit where the power switch module is located; the driver board power supply module supplies power to the digital isolator module and the power switch module respectively; the power switch module includes IGBTs and outputs the phase voltage of the corresponding half-bridge arm through the output interface.

6. The distributed modular multiphase inverter device according to claim 1, characterized in that, The base plate (5) is provided with an input interface, a high-current terminal block and a filter capacitor that are connected to the output interface of the drive board (4). Near the high-current terminal block, there is a connection hole for fixed connection with the DC bus plate (6), so that the base plate (5) and the DC bus plate (6) can be mechanically fixed and electrically connected by fasteners. The filter capacitor is used to store energy. The area around the connection hole is divided into a wiring area, which is used to connect the motor phase line, the positive terminal Pdc of the DC bus and the negative terminal Ndc of the DC bus.

7. The distributed modular multiphase inverter device according to claim 6, characterized in that, There are four drive boards (4), each drive board (4) includes three half-bridge arms, each half-bridge arm includes a positive terminal, a negative terminal and a midpoint output terminal; the DC bus board (6) forms twelve DC bus positive terminals, twelve DC bus negative terminals and twelve midpoint output terminals, and forms a two-level multiphase inverter, an H-bridge inverter, a dual three-phase open winding inverter and an active neutral point clamped three-level inverter by selective wiring.

8. A method for topology reconfiguration using the distributed modular multiphase inverter device according to any one of claims 1 to 7, characterized in that: According to the target drive topology, a target wiring area is selected from multiple wiring areas of the DC bus board (6), the phase line connection end of the target wiring area is connected to the motor winding end, and the DC bus connection end of the target wiring area is connected to the positive or negative end. Unused wiring areas are isolated. The control board (1) generates a corresponding PWM control signal according to the formed target drive topology, and outputs it to the corresponding half-bridge arm through the adapter board (2) and the drive board (4).

9. The topology reconstruction method according to claim 8, characterized in that, Also includes: The control board (1) performs open circuit fault simulation or fault-tolerant control based on the current sampling signal, rotor position and motor speed signal: In the fault simulation state, the control board (1) simulates inverter open circuit fault or motor winding related fault by changing the control signal of the corresponding half bridge arm or isolating the corresponding wiring area, and performs current reconstruction based on the remaining phase current sampling signal.

10. The topology reconstruction method according to claim 8, characterized in that: When the target drive topology is an H-bridge inverter topology, select two half-bridge arms, connect the positive ends of the two half-bridge arms to Pdc, and connect the negative ends of the two half-bridge arms to Ndc. Use the midpoint output terminals of the two half-bridge arms as either the load or the two ends of a single-phase winding. When the target drive topology is a dual three-phase open-winding inverter topology, taking a six-phase inverter as an example, select six half-bridge arms to form the first three-phase arm group and the second three-phase arm group. Connect the midpoint output terminals of the first three-phase arm group to one end of each three-phase winding, and connect the midpoint output terminals of the second three-phase arm group to... Connect to the other end of the three-phase winding; when the target drive topology is an active neutral point clamped three-level inverter topology, select three half-bridge arms to form a three-level phase bridge arm, connect the positive end of the first half-bridge arm to Pdc, connect the negative end of the first half-bridge arm and the positive end of the third half-bridge arm to Mdc, connect the negative end of the third half-bridge arm to Ndc, connect the positive and negative ends of the second half-bridge arm to the midpoint output terminals of phases A and C of the three-level phase bridge arm respectively, and use the midpoint output terminal of phase B of the three-level phase bridge arm as the phase output terminal, where Mdc is the DC bus midpoint.

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