Energy conversion system and power system

Abstract

The application provides an energy conversion system and a power system, the energy conversion system comprising a first filter assembly, a motor control circuit, a motor and a control module; wherein a first end of the motor control circuit is connected to a direct current power supply; the first end of the motor control circuit is connected to a first end of a battery module through the first filter assembly; a second end of the motor control circuit is connected to a second end of the battery module through the first filter assembly; the motor control circuit is connected to the direct current power supply through the motor; and the control module is used to control the motor control circuit to drive the motor based on a direct current input voltage provided by the direct current power supply and charge the battery module. In the application, each bridge arm switch can be controlled to work in cooperation, so that the first filter assembly is in an unsaturated state when in a working state, thereby effectively reducing EMC interference.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, and in particular to an energy conversion system and a power system. Background Technology

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to operate in its electromagnetic environment without causing unacceptable electromagnetic interference to any other device in that environment.

[0003] As modern automobiles evolve towards intelligent manufacturing, more electronic components are needed to support these advancements. To ensure vehicle reliability, quality testing agencies and automakers typically conduct tests according to relevant EMC standards. Therefore, each electronic component in the vehicle must be designed with EMC in mind to prevent electromagnetic interference.

[0004] In existing technologies, the motor control unit (MCU) in electric vehicles typically incorporates common-mode filtering components, such as common-mode inductors, to reduce EMC interference. However, due to the poor EMC suppression effect of these filtering components during the charging process of electric vehicles, they cannot effectively reduce EMC interference in this situation. Summary of the Invention

[0005] This application provides an energy conversion system and a power system, characterized in that it can control the switches of each bridge arm to work in coordination, so that the filter component is in an unsaturated state when it is working, thereby effectively reducing EMC interference.

[0006] In a first aspect, this application provides an energy conversion system comprising a first filter component, a motor control circuit, a motor, and a control module. The first terminal of the motor control circuit is connected to a DC power supply. The first terminal of the motor control circuit is connected to a first terminal of a battery module via the first filter component. The second terminal of the motor control circuit is connected to a second terminal of the battery module via the first filter component. The motor control circuit is connected to the DC power supply through the motor. The control module controls the motor control circuit to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply. In this application, the switches of each bridge arm can be controlled to work in coordination, so that the sum of the currents passing through the first filter component at any given time is 0, ensuring that the first filter component is in an unsaturated state during operation, thereby effectively reducing EMC interference.

[0007] In conjunction with the first aspect, in a first possible implementation, the motor control circuit includes a bridge arm switching module; a first terminal of the motor control circuit is the first terminal of the bridge arm switching module; a second terminal of the motor control circuit is the second terminal of the bridge arm switching module; the energy conversion system further includes a second filter component; multiple first terminals of the second filter component are respectively connected to the midpoints of the bridge arms of multiple bridge arm switches of the bridge arm switching module; multiple second terminals of the second filter component are respectively connected to the three-phase windings in the motor; the neutral line of the motor is connected to the DC power supply, and the neutral line of the motor is led out from the common connection terminal of the three-phase windings; the control module is used to control the operation of the bridge arm switches in the motor control circuit to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply. In this application, the bridge arm switches can be controlled to work in coordination, so that the first filter component is in an unsaturated state when working; at the same time, a second filter component is added, which can suppress EMC interference; thereby effectively reducing EMC interference.

[0008] In conjunction with the first possible implementation of the first aspect, in the second possible implementation, the first end of the aforementioned bridge arm conversion module is connected to the positive terminal of the aforementioned DC power supply; the first end of the aforementioned battery module is the positive terminal of the aforementioned battery module, and the second end of the aforementioned battery module is the negative terminal of the aforementioned battery module; the neutral line of the aforementioned motor is connected to the negative terminal of the aforementioned DC power supply. During the process of the DC power supply charging the battery module through the aforementioned energy conversion system, the excitation circuit does not pass through the first filter component; the freewheeling circuit passes through the first filter component from both the positive and negative directions; therefore, the sum of the currents passing through the first filter component at any given time is 0, and the first filter component is in an unsaturated state. Even during charging, it can still achieve a good EMC suppression effect, and this energy conversion system can effectively reduce EMC interference.

[0009] In conjunction with the first possible implementation of the first aspect, in the third possible implementation, the first end of the aforementioned bridge arm conversion module is connected to the negative terminal of the aforementioned DC power supply; the first end of the aforementioned battery module is the negative terminal of the aforementioned battery module, and the second end of the aforementioned battery module is the positive terminal of the aforementioned battery module; the neutral line of the aforementioned motor is connected to the positive terminal of the aforementioned DC power supply. During the process of the DC power supply charging the battery module through the aforementioned energy conversion system, the excitation circuit does not pass through the first filter component; the freewheeling circuit passes through the first filter component from both the positive and negative directions; therefore, the sum of the currents passing through the first filter component at any given time is 0, and the first filter component is in an unsaturated state. Even during charging, it can still achieve a good EMC suppression effect, and this energy conversion system can effectively reduce EMC interference.

[0010] In conjunction with the first aspect, in a fourth possible implementation, the motor control circuit includes a bridge arm conversion module; a first terminal of the motor control circuit is a first terminal of the bridge arm conversion module; a second terminal of the motor control circuit is a second terminal of the bridge arm conversion module; the energy conversion system further includes a second filter component; multiple first terminals of the second filter component are respectively connected to the midpoints of the bridge arms of multiple bridge arm switches of the bridge arm conversion module; multiple second terminals of the second filter component are respectively connected to the three-phase windings in the motor; any one of the multiple first terminals of the second filter component is connected to the DC power supply; the control module is used to control the operation of the bridge arm switches in the bridge arm conversion module to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply. In this application, the bridge arm switches can be controlled to work in coordination, so that the sum of the currents passing through the first filter component and the second filter component is 0 at any time, so that both the first filter component and the second filter component are in an unsaturated state during operation, thereby effectively reducing EMC interference.

[0011] In conjunction with the fourth possible implementation of the first aspect, in the fifth possible implementation, any one of the plurality of first terminals of the second filter component is connected to the negative terminal of the DC power supply; the first terminal of the bridge arm converter module is connected to the positive terminal of the DC power supply; the first terminal of the battery module is the positive terminal of the battery module, and the second terminal of the battery module is the negative terminal of the battery module. During the charging process of the DC power supply to the battery module through the energy conversion system, the sum of the currents passing through the first filter component is 0 at any given time, and the sum of the currents passing through the second filter component is 0 at any given time. That is, both the first and second filter components are in an unsaturated state, and both can achieve EMC suppression during charging. This energy conversion system can effectively reduce EMC interference.

[0012] In conjunction with the fourth possible implementation of the first aspect, in the sixth possible implementation, any one of the plurality of first terminals of the second filter component is connected to the positive terminal of the DC power supply; the first terminal of the bridge arm converter module is connected to the negative terminal of the DC power supply; the first terminal of the battery module is the negative terminal of the battery module, and the second terminal of the battery module is the positive terminal of the battery module. During the charging process of the DC power supply to the battery module through the energy conversion system, the sum of the currents passing through the first filter component is 0 at any given time, and the sum of the currents passing through the second filter component is 0 at any given time. That is, both the first and second filter components are in an unsaturated state, and both can achieve EMC suppression during charging. This energy conversion system can effectively reduce EMC interference.

[0013] Secondly, embodiments of this application provide an energy conversion system, which includes a first filter component, a motor control circuit, a motor, and a control module. The first terminal of the motor control circuit is connected to a DC load; the first terminal of the motor control circuit is connected to a first terminal of a battery module via the first filter component; the second terminal of the motor control circuit is connected to a second terminal of the battery module via the first filter component; the motor control circuit is connected to the DC load through the motor; and the control module controls the motor control circuit to drive the motor and charge the DC load based on the input voltage provided by the battery module. In this application, the switches of each bridge arm can be controlled to work in coordination, so that the sum of the currents passing through the first filter component at any given time is 0, ensuring that the first filter component is in an unsaturated state during operation, thereby effectively reducing EMC interference.

[0014] In conjunction with the second aspect, in a first possible implementation, the motor control circuit includes a bridge arm conversion module; a first terminal of the motor control circuit is a first terminal of the bridge arm conversion module; a second terminal of the motor control circuit is a second terminal of the bridge arm conversion module; the energy conversion system further includes a second filter component; multiple first terminals of the second filter component are respectively connected to the midpoints of the bridge arms of multiple bridge arm switches of the bridge arm conversion module; multiple second terminals of the second filter component are respectively connected to the three-phase windings in the motor; the neutral line of the motor is connected to the DC load, and the neutral line of the motor is led out from the common connection terminal of the three-phase windings; the control module is used to control the motor control circuit to drive the motor and charge the DC load based on the input voltage provided by the battery module. In this application, the bridge arm switches can be controlled to work in coordination, so that the first filter component is in an unsaturated state when working; at the same time, a second filter component is added, which can suppress EMC interference; thereby effectively reducing EMC interference.

[0015] In conjunction with the first possible implementation of the second aspect, in the second possible implementation, the first end of the aforementioned bridge arm converter module is connected to the positive terminal of the aforementioned DC load; the first end of the aforementioned battery module is the positive terminal of the aforementioned battery module, and the second end of the aforementioned battery module is the negative terminal of the aforementioned battery module; the neutral line of the aforementioned motor is connected to the negative terminal of the aforementioned DC load. During the process of the battery module charging the DC load through the aforementioned energy conversion system, the first filter component is in an unsaturated state, and can still play an EMC suppression role during the charging state. This energy conversion system can effectively reduce EMC interference.

[0016] In conjunction with the first possible implementation of the second aspect, in the third possible implementation, the first end of the aforementioned bridge arm converter module is connected to the negative terminal of the aforementioned DC load; the first end of the aforementioned battery module is the negative terminal of the aforementioned battery module, and the second end of the aforementioned battery module is the positive terminal of the aforementioned battery module; the neutral line of the aforementioned motor is connected to the positive terminal of the aforementioned DC load. During the process of the battery module charging the DC load through the aforementioned energy conversion system, the first filter component is in an unsaturated state, and can still play an EMC suppression role during the charging state. This energy conversion system can effectively reduce EMC interference.

[0017] In conjunction with the second aspect, in a fourth possible implementation, the motor control circuit includes a bridge arm conversion module; a first terminal of the motor control circuit is a first terminal of the bridge arm conversion module; a second terminal of the motor control circuit is a second terminal of the bridge arm conversion module; the energy conversion system further includes a second filter component; multiple first terminals of the second filter component are respectively connected to the midpoints of the bridge arms of multiple bridge arm switches of the bridge arm conversion module; multiple second terminals of the second filter component are respectively connected to the three-phase windings in the motor; any one of the multiple first terminals of the second filter component is connected to the DC load; the control module is used to control the motor control circuit to drive the motor and charge the DC load based on the input voltage provided by the battery module. In this application, the bridge arm switches can be controlled to work together so that the sum of the currents passing through the first filter component and the second filter component is 0 at any time, so that both the first filter component and the second filter component are in an unsaturated state during operation, thereby effectively reducing EMC interference.

[0018] In conjunction with the fourth possible implementation of the second aspect, in the fifth possible implementation, any one of the plurality of first terminals of the second filter component is connected to the negative terminal of the DC load; the first terminal of the bridge arm converter module is connected to the positive terminal of the DC load; the first terminal of the battery module is the positive terminal of the battery module, and the second terminal of the battery module is the negative terminal of the battery module. In this application, the bridge arm switches can be controlled to work in coordination, so that the sum of the currents passing through the first filter component and the second filter component is 0 at any given time, so that both the first filter component and the second filter component are in an unsaturated state during operation, thereby effectively reducing EMC interference.

[0019] In conjunction with the fourth possible implementation of the second aspect, in the sixth possible implementation, any one of the plurality of first terminals of the second filter component is connected to the positive terminal of the DC load; the first terminal of the bridge arm converter module is connected to the negative terminal of the DC load; the first terminal of the battery module is the negative terminal of the battery module, and the second terminal of the battery module is the positive terminal of the battery module. In this application, the bridge arm switches can be controlled to work in coordination, so that the sum of the currents passing through the first filter component and the second filter component is 0 at any given time, ensuring that both the first filter component and the second filter component are in an unsaturated state during operation, thereby effectively reducing EMC interference.

[0020] Thirdly, embodiments of this application provide an energy conversion system, which includes a bridge arm conversion module, a common-mode filter component, a motor, and a control module. Multiple connection terminals of the common-mode filter component are respectively connected to the midpoints of the bridge arms of multiple bridge arm switches in the bridge arm conversion module. Multiple connection terminals of the common-mode filter component are respectively connected to the three-phase windings of the motor. Any one of the multiple connection terminals of the common-mode filter component is connected to the DC power supply. The control module controls the operation of the bridge arm switches in the bridge arm conversion module to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply. In this application, the bridge arm switches can be controlled to work in coordination, so that the sum of the currents passing through the common-mode filter component at any given time is 0, making the common-mode filter component unsaturated during operation, thereby effectively reducing EMC interference.

[0021] Fourthly, embodiments of this application provide an energy conversion system comprising a bridge arm switching module, a common-mode filter component, a motor, and a control module. Multiple connection terminals of the common-mode filter component are respectively connected to the midpoints of the bridge arms of multiple bridge arm switches in the bridge arm switching module. Multiple connection terminals of the common-mode filter component are respectively connected to the three-phase windings of the motor. Any one of the multiple connection terminals of the common-mode filter component is connected to the DC load. The control module controls the operation of the bridge arm switches in the bridge arm switching module to drive the motor and charge the DC load based on the input voltage provided by the battery module. During the charging process of the battery module to the DC load through the energy conversion system, the first filter component is in an unsaturated state and can still achieve EMC suppression during charging. This energy conversion system can effectively reduce EMC interference.

[0022] Fifthly, this application provides a power system including a battery module and an energy conversion system as described in any of the first to fourth aspects above. The battery module may include, but is not limited to, high-voltage batteries (also referred to as power batteries) and low-voltage batteries. This power system is suitable for electric devices, including but not limited to electric vehicles, electric amusement equipment, electric trains, electric bicycles, golf carts, or other electric devices. Because the aforementioned energy conversion system can simultaneously drive the motor and charge the battery module, or drive the motor alone, or charge the battery module alone, the power system's efficiency and flexibility can be improved, its structure is simpler, and its cost is lower.

[0023] In this application, the switches of each bridge arm can be controlled to work together so that the sum of the currents passing through the first filter component and / or the second filter component is 0 at any time, so that the first filter component and / or the second filter component are in an unsaturated state when they are working, thereby effectively reducing EMC interference during the process of DC power supply charging the battery module or battery module charging DC load. Attached Figure Description

[0024] Figure 1 This is a schematic diagram illustrating the application scenario of the energy conversion system provided in this application;

[0025] Figure 2A This is a schematic diagram of the energy conversion system provided in this application;

[0026] Figure 2B This is another structural schematic diagram of the energy conversion system provided in this application;

[0027] Figure 3 This is another structural schematic diagram of the energy conversion system provided in this application;

[0028] Figure 4 This is another structural schematic diagram of the energy conversion system provided in this application;

[0029] Figure 5 This is another structural schematic diagram of the energy conversion system provided in this application;

[0030] Figure 6 This is another structural schematic diagram of the energy conversion system provided in this application;

[0031] Figure 7 This is another structural schematic diagram of the energy conversion system provided in this application;

[0032] Figure 8 This is another structural schematic diagram of the energy conversion system provided in this application;

[0033] Figure 9This is another structural schematic diagram of the energy conversion system provided in this application;

[0034] Figure 10 This is another structural schematic diagram of the energy conversion system provided in this application;

[0035] Figure 11 This is another structural schematic diagram of the energy conversion system provided in this application;

[0036] Figure 12 This is another structural schematic diagram of the energy conversion system provided in this application;

[0037] Figure 13A This is another structural schematic diagram of the energy conversion system provided in this application;

[0038] Figure 13B This is another structural schematic diagram of the energy conversion system provided in this application;

[0039] Figure 14 This is a schematic diagram of the power system provided in this application;

[0040] Figure 15 This is a schematic diagram of the power system provided in this application. Detailed Implementation

[0041] The energy conversion system provided in this application is applicable to battery modules (such as high-voltage batteries and low-voltage batteries) and motors in electric devices, thereby enabling the charging of high-voltage and low-voltage batteries, driving of the motor, or simultaneous driving of the motor and charging of high-voltage and low-voltage batteries. The electric devices may include, but are not limited to, electric vehicles, electric amusement equipment, electric trains, electric bicycles, golf carts, or other electric equipment, the specific type to be determined based on the actual application scenario, and no limitations are imposed here. The energy conversion system provided in this application is adaptable to different application scenarios, such as electric vehicle application scenarios and electric amusement equipment application scenarios. This application will use the electric vehicle application scenario as an example for illustration.

[0042] Please see also Figure 1 , Figure 1 This is a schematic diagram of the application scenario of the energy conversion system provided in this application.

[0043] In electric vehicle application scenarios, such as Figure 1As shown, the electric vehicle 10 may include a high-voltage battery (also called a power battery), a low-voltage battery (also called a low-voltage storage battery), and an energy conversion system. The motor in the energy conversion system can be understood as the motor in the electric vehicle 10 (such as the air conditioning compressor motor). When charging the high-voltage and low-voltage batteries is required, the energy conversion system can provide DC power to charge them. After the high-voltage battery is fully charged, it can provide DC power to the drive motor in the electric vehicle 10. This drive motor can convert the DC power from the high-voltage battery into mechanical energy to drive the electric vehicle 10. When the drive motor is needed, other functional modules in the energy conversion system can provide AC power to drive it, at which point the air conditioning system in the electric vehicle 10 can operate normally. Optionally, the energy conversion system can also drive the motor and charge the high-voltage and low-voltage batteries, thus achieving simultaneous battery charging while the air conditioning system is operating. This meets the different needs of the electric vehicle, simplifies its structural layout, reduces cost, increases size, increases integration, and enhances applicability.

[0044] like Figure 1 As shown, when the electric vehicle 10 is charging, it can generally be charged through the charging pile 20. The charging pile 20 includes a power circuit and a charging gun; one end of the power circuit is connected to the power grid, and the other end is connected to the charging gun via a cable. Currently, most charging piles are DC charging piles, and the power circuit can convert the AC power provided by the power grid into DC power. For example, the operator can insert the charging gun into the charging port of the electric vehicle, connecting the charging gun to the power battery inside the electric vehicle, and the power circuit of the charging pile 20 can then charge the power battery through the charging gun.

[0045] The output voltage of the charging pile 20 can be understood as the power supply voltage received by the electric vehicle 10. In a DC fast charging scenario, the power supply voltage received by the electric vehicle 10 is within the charging voltage range of the power battery, and the power battery can directly use the output voltage of the charging pile 20 to complete the charging.

[0046] The following will combine Figures 2A to 14 The energy conversion system, power system and their working principle provided in this application are illustrated with examples.

[0047] Please see Figure 2A , Figure 2A This is a structural schematic diagram of the energy conversion system provided in this application. Figure 2AAs shown, the energy conversion system 1 includes a first filter component 10, a motor control circuit 20, a control module 30, and a motor 40. The first terminal of the motor control circuit 20 is connected to a DC power supply; the first terminal of the motor control circuit 20 is connected to the first terminal of the battery module via the first filter component 10; the second terminal of the motor control circuit 20 is connected to the second terminal of the battery module via the first filter component 10; and the motor 40 is connected to a DC power supply.

[0048] In some feasible implementations, the control module 30 may include, but is not limited to, a control board, a control chip, or a controller. The control module 30 is used to control the motor control circuit 20 to drive the motor 40 and charge the battery module based on the DC input voltage provided by the DC power supply, and to ensure that the first filter components 10 are all in an unsaturated state during the charging process, thereby effectively reducing EMC interference.

[0049] Specifically, the motor control circuit 20 may include a bridge arm conversion module. It should be noted that the specific circuit of the motor control circuit 20 can be determined according to the actual application scenario; see [reference needed]. Figures 3 to 12 The illustrative structures shown are not intended to be limiting.

[0050] The energy conversion system 1 may further include a second filter component. The second filter component and the motor control circuit 20 may be integrated into one functional module or be two separate functional modules. The first filter component 10 and the second filter component are common-mode filter components, such as common-mode inductors or common-mode magnetic rings.

[0051] It should be noted that, Figure 2A For details regarding the working principle and specific implementation of the energy conversion system shown, please refer to [link / reference needed]. Figures 3 to 12 Examples of implementations.

[0052] Please see Figure 2B , Figure 2B This is another structural schematic diagram of the energy conversion system provided in this application. (See diagram below.) Figure 2B As shown, the energy conversion system 1 includes a first filter component 10, a motor control circuit 20, a control module 30, and a motor 40. The first terminal of the motor control circuit 20 is connected to a DC load; the first terminal of the motor control circuit 20 is connected to the first terminal of the battery module via the first filter component 10; the second terminal of the motor control circuit 20 is connected to the second terminal of the battery module via the first filter component 10; and the motor 40 is connected to the DC load.

[0053] In some feasible implementations, the control module 30 may include, but is not limited to, a control board, a control chip, or a controller. The control module 30 is used to control the motor control circuit 20 to drive the motor 40 and charge the DC load based on the input voltage provided by the battery module, and to ensure that the first filter components 10 are all in an unsaturated state during the charging process, thereby effectively reducing EMC interference.

[0054] The energy conversion system 1 also includes a second filter component. The second filter component and the motor control circuit 20 can be integrated into one functional module, or they can be two separate functional modules.

[0055] Specifically, the motor control circuit 20 may include a bridge arm conversion module and a second filter component, etc.; the first filter component 10 is a common-mode filter component, such as a common-mode inductor or a common-mode magnetic ring. It should be noted that the specific circuit of the motor control circuit 20 can be determined according to the actual application scenario, and can be found in [reference needed]. Figures 3 to 12 The illustrative structures shown are not intended to be limiting.

[0056] It should be noted that the DC input voltage provided by the DC power supply to drive the motor 40 and charge the battery module can be considered as the boost mode of the energy conversion system; the input voltage provided by the battery module to drive the motor 40 and charge the DC load can be considered as the buck mode of the energy conversion system. It should be noted that the difference between the boost mode and the buck mode is only that the control module 30 controls the motor control circuit 20 differently, but the working principle is the same. Therefore, in the following embodiments, the working principle is explained by taking the DC power supply charging the battery module as an example, and will not be repeated.

[0057] Figure 3 Another schematic diagram of an energy conversion system is shown as an example.

[0058] like Figure 3 As shown, the motor control circuit 20 may include a bridge arm conversion module 201 and a second filter component 202; the first end of the bridge arm conversion module 201 is connected to a DC power supply; the first end of the bridge arm conversion module 201 is connected to the first end of the battery module via the first filter component 10; the second end of the bridge arm conversion module 201 is connected to the second end of the battery module via the first filter component 10.

[0059] In this system, the midpoints of the multiple bridge arm switches in the bridge arm conversion module 201 are connected to the three-phase windings of the motor 40 via the second filter component 202. The neutral line of the motor 40 is connected to a DC power supply, and the neutral line of the motor 40 is led out from the common connection terminal of the three-phase windings. The control module is used to control the operation of the bridge arm switches in the bridge arm conversion module 201 to drive the motor 40 and charge the battery module based on the DC input voltage provided by the DC power supply. It should be noted that the first filter component 10 can also be called a direct current (DC) filter component; the second filter component 202 can also be called an alternating current (AC) filter component.

[0060] In some feasible implementations, the aforementioned bridge arm conversion module 201 includes multiple bridge arm switches connected in parallel. The parallel connection terminals of the multiple bridge arm switches can serve as the input / output terminals of the bridge arm conversion module 201. Each bridge arm switch includes an upper bridge arm switch (also called an upper tube switch) and a lower bridge arm switch (also called a lower tube switch) connected in series. The series connection point of the upper and lower bridge arm switches can serve as the midpoint of the bridge arm of the bridge arm switch. The midpoint of the bridge arm of one of the multiple bridge arm switches can be connected to one phase winding of the three-phase winding of the motor 40. The multiple bridge arm switches here can be made of silicon semiconductor materials (Si), or third-generation wide-bandgap semiconductor materials such as silicon carbide (SiC), gallium nitride (GaN), diamond, zinc oxide (ZnO), or other materials, such as metal-oxide-semiconductor field-effect transistors (MOSFETs) or insulated-gate bipolar transistors (IGBTs). The specific type can be determined according to the actual application scenario and is not limited here. The specific circuit topology of the bridge arm conversion module 201 can be determined according to the actual application scenario, such as a two-level topology or a multi-level topology, and is not limited here.

[0061] In some feasible implementations, the control module 30 can be integrated with the arm switching module 201 on the same control board or printed circuit board (PCB). This control module 30 (also called an integrated controller) can control the on / off state of the arm switching module 201. The circuit board, also called a PCB, is a support for electronic components and a carrier for their electrical interconnection. The control module 30 can control the arm switch operation (i.e., the on / off state of the arm switch) in the arm switching module 201 to drive the motor 40 and charge the high-voltage and low-voltage batteries based on the input voltage provided by the power supply. The motor 40 can be a motor used in electric vehicles, such as a drive motor, an air conditioning compressor motor, or other motors.

[0062] In some feasible implementations, the above Figure 3 The motor 40 shown may include, but is not limited to, three-phase and six-phase motors. The specific type of motor 40 can be determined according to the actual application scenario and is not limited here. For example, if the motor 40 is a three-phase motor, the multiphase winding can be a three-phase winding; if the motor 40 is a six-phase motor, the multiphase winding can be a six-phase winding. For ease of description, the following explanation will take a three-phase motor 40 as an example, and will not be repeated here.

[0063] about Figure 3 The working principle of the energy conversion system shown can be found below. Figures 4 to 7 Related content.

[0064] Please see Figure 4 , Figure 4 An exemplary diagram is shown when the energy conversion system, battery module and DC power supply are connected in common positive connection.

[0065] Figure 4 Another schematic diagram of an energy conversion system is shown as an example. Figure 4 As shown, the energy conversion system 1 includes a first filter component 10, a motor control circuit 20, a control module 30, and a motor 40. The motor control circuit 20 includes a bridge arm conversion module 201 and a second filter component 202.

[0066] In some feasible implementations, as described above Figure 4As shown, the bridge arm switching module 201 includes, but is not limited to, bridge arm switches 201a, 201b, and 201c; the three-phase windings may include winding V, winding U, and winding W, wherein winding V, winding U, and winding W are windings with the same frequency and amplitude. Specifically, bridge arm switch 201a includes an upper bridge arm switch S1 and a lower bridge arm switch S2 connected in series, with the midpoint of the bridge arm of bridge arm switch 201a being the series connection point of the upper bridge arm switch S1 and the lower bridge arm switch S2; bridge arm switch 201b includes an upper bridge arm switch S3 and a lower bridge arm switch S4 connected in series, with the midpoint of the bridge arm of bridge arm switch 201b being the series connection point of the upper bridge arm switch S3 and the lower bridge arm switch S4; bridge arm switch 201c includes an upper bridge arm switch S5 and a lower bridge arm switch S6 connected in series, with the midpoint of the bridge arm of bridge arm switch 201c being the series connection point of the upper bridge arm switch S5 and the lower bridge arm switch S6.

[0067] In some feasible implementations, the first end of the bridge arm conversion module 201 is connected to the positive terminal of the DC power supply, and the first end of the bridge arm conversion module 201 is connected to the positive terminal of the battery module via the first filter component 10; the negative terminal of the battery module is connected to the second end of the bridge arm conversion module 201 via the first filter component 10; the midpoint of the bridge arm of the bridge arm switch 201a is connected to the winding U of the three-phase winding via the second filter component 202, the midpoint of the bridge arm of the bridge arm switch 201b is connected to the winding V of the three-phase winding via the second filter component 202, and the midpoint of the bridge arm of the bridge arm switch 201c is connected to the winding W of the three-phase winding via the second filter component 202; the common connection terminal of the three-phase winding is connected to the negative terminal of the DC power supply. Thus, bridge arm switches 201a, 201b, and 201c correspond one-to-one with windings U, V, and W. The input / output terminals of the aforementioned bridge arm conversion module 201 can be connected to the battery module. The input / output terminals of the bridge arm conversion module 201 can be understood as the parallel connection terminals of bridge arm switches 201a, 201b and 201c.

[0068] In some feasible implementations, the control module 30 may include, but is not limited to, a control board, a control chip, or a controller. The control module 30 can establish a wired or wireless connection with bridge arm switches 201a, 201b, and 201c, depending on the actual application scenario, and is not limited here. The control module 30 can control the operation of each bridge arm switch among bridge arm switches 201a, 201b, and 201c. For example, the control module 30 can turn on any one of the bridge arm switches 201a, 201b, and 201c, thereby achieving the purpose of driving the motor 40 and charging the battery module based on the DC voltage provided by the DC power supply, while simultaneously ensuring that the first filter component 10 is in an unsaturated state, which can effectively reduce EMC interference.

[0069] The following section uses DC power supply to charge a battery module as an example to introduce... Figure 4 The working principle of the energy conversion system shown.

[0070] In one possible implementation, the control module can turn on the upper bridge arm switch S3 and the lower bridge arm switch S4 in the bridge arm switch 201b to enable the DC power supply to charge the battery module.

[0071] At this time, the excitation circuit flows as follows: from the positive terminal of the DC power supply to the first end of the bridge arm conversion module 201, then through the upper bridge arm switch S3, from the midpoint of the bridge arm of the bridge arm switch 201b to the first end of the second filter component 202, from the second end of the second filter component 202 to the winding V of the three-phase winding, and from the neutral line of the motor to the negative terminal of the DC power supply. It can be seen that the excitation circuit does not pass through the first filter component 10.

[0072] The freewheeling circuit flows as follows: from the positive terminal of the DC power supply, through the first filter component 10, to the positive terminal of the battery module; from the positive terminal of the battery module, through the first filter component 10, to the second end of the bridge arm conversion module 201; after passing through the lower bridge arm switch S4, it flows out from the midpoint of the bridge arm of the bridge arm switch 201b, to the first end of the second filter component 202; from the second end of the second filter component 202, it flows to the winding V of the three-phase winding; and from the neutral line of the motor, it flows to the negative terminal of the DC power supply. Therefore, the freewheeling circuit passes through the first filter component 10 in both the positive and negative directions.

[0073] In summary, during the process of the DC power supply charging the battery module through the above-mentioned energy conversion system, the current through the first filter component 10 is 0 at any time, and the first filter component 10 is in an unsaturated state. It can still play an EMC suppression role in the charging state, and the energy conversion system can effectively reduce EMC interference.

[0074] In one possible implementation, the energy conversion system may also include several switches and capacitors, etc. See also... Figure 5 , Figure 5 Another schematic diagram of an energy conversion system is shown as an example. Figure 5As shown, the energy conversion system 1 can also include switches K1, K2, K3, K4, K5, and capacitor C. Switch K1 is located between the bridge arm conversion module 201 and the positive terminal of the DC power supply; switch K2 is located between the first filter component 10 and the positive terminal of the battery; switch K3 is located between the negative terminal of the battery and the first filter component 10; switch K4 is located between the common terminal of the three-phase winding and the negative terminal of the DC power supply; the first end of switch K5 is located between the bridge arm conversion module 201 and the positive terminal of the DC power supply, and the second end of switch K5 is connected to the first end of capacitor C. The second end of the capacitor is located between the common connection terminal of the three-phase winding and the negative terminal of the DC power supply. Switches K1, K2, K3, K4, and K5 can be high-current contactors; switch K1 can be a DC fast-charging relay; switch K2 can be a main positive relay; and switch K3 can be a main negative relay.

[0075] In some feasible implementations, when charging the battery module, the control module 30 can also control switches K1, K2, K3, and K4 to be turned on, control switch K5 to be turned off, and control the operation of each of the bridge arm switches to achieve the purpose of charging the battery module based on the voltage provided by the DC power supply.

[0076] Figure 5 The working principle of the energy conversion system shown can be referenced. Figure 4 The relevant descriptions will not be repeated here.

[0077] Please see Figure 6 , Figure 6 An exemplary diagram is shown when the energy conversion system, battery module and DC power supply are connected via a common negative connection.

[0078] Figure 6 Another schematic diagram of an energy conversion system is shown as an example. Figure 6 As shown, the energy conversion system 1 includes a first filter component 10, a motor control circuit 20, a control module 30, and a motor 40. The motor control circuit 20 includes a bridge arm conversion module 201 and a second filter component 202.

[0079] In some feasible implementations, as described above Figure 6As shown, the bridge arm switching module 201 includes, but is not limited to, bridge arm switches 201a, 201b, and 201c. Bridge arm switch 201a includes an upper bridge arm switch S1 and a lower bridge arm switch S2 connected in series, with the midpoint of the bridge arm of switch 201a being the series connection point of the upper bridge arm switch S1 and the lower bridge arm switch S2. Bridge arm switch 201b includes an upper bridge arm switch S3 and a lower bridge arm switch S4 connected in series, with the midpoint of the bridge arm of switch 201b being the series connection point of the upper bridge arm switch S3 and the lower bridge arm switch S4. Bridge arm switch 201c includes an upper bridge arm switch S5 and a lower bridge arm switch S6 connected in series, with the midpoint of the bridge arm of switch 201c being the series connection point of the upper bridge arm switch S5 and the lower bridge arm switch S6.

[0080] The first end of the bridge arm conversion module 201 is connected to the negative terminal of the DC power supply, and the first end of the bridge arm conversion module 201 is connected to the negative terminal of the battery module via the first filter component 10; the positive terminal of the battery module is connected to the second end of the bridge arm conversion module 201 via the first filter component 10; the midpoint of the bridge arm of the bridge arm switch 201a is connected to the winding U of the three-phase winding via the second filter component 202; the midpoint of the bridge arm of the bridge arm switch 201b is connected to the winding V of the three-phase winding via the second filter component 202; the midpoint of the bridge arm of the bridge arm switch 201c is connected to the winding W of the three-phase winding via the second filter component 202; and the common connection terminal of the three-phase winding is connected to the positive terminal of the DC power supply.

[0081] In some feasible implementations, the control module 30 may include, but is not limited to, a control board, a control chip, or a controller. The control module 30 can establish a wired or wireless connection with bridge arm switches 201a, 201b, and 201c, depending on the actual application scenario, and is not limited here. The control module 30 can control the operation of each bridge arm switch among bridge arm switches 201a, 201b, and 201c. For example, the control module 30 can turn on any bridge arm switch among bridge arm switches 201a, 201b, and 201c, thereby achieving the purpose of driving the motor 40 and charging the battery module based on the DC voltage provided by the DC power supply, while simultaneously ensuring that the first filter component 10 is in an unsaturated state, which can effectively reduce EMC interference.

[0082] The following section uses DC power supply to charge a battery module as an example to introduce... Figure 6 The working principle of the energy conversion system shown.

[0083] In one possible implementation, the control module can turn on the upper bridge arm switch S3 and the lower bridge arm switch S4 in the bridge arm switch 201a to enable the DC power supply to charge the battery module.

[0084] At this time, the excitation circuit flows as follows: from the positive terminal of the DC power supply to the common terminal of the three-phase winding, through the winding V of the three-phase winding to the second filter component 202, then through the midpoint of the bridge arm of the bridge arm switch 201b in the bridge arm conversion module 201 to the lower bridge arm switch S4, and then from the first end of the bridge arm conversion module 201 to the negative terminal of the DC power supply. It can be seen that the excitation circuit does not pass through the first filter component 10.

[0085] The freewheeling circuit flows from the positive terminal of the DC power supply to the common terminal of the three-phase winding, then through the winding V of the three-phase winding to the second filter component 202, and then through the midpoint of the bridge arm of the bridge arm switch 201b in the bridge arm conversion module 201 to the upper bridge arm switch S3. Furthermore, it flows from the second terminal of the bridge arm conversion module 201 through the first filter component 10 to the positive terminal of the DC power supply, and from the negative terminal of the DC power supply through the first filter component 10 to the negative terminal of the DC power supply. Therefore, the freewheeling circuit passes through the first filter component 10 in both the positive and negative directions.

[0086] In summary, during the process of the DC power supply charging the battery module through the above-mentioned energy conversion system, the current through the first filter component 10 is 0 at any time, and the first filter component 10 is in an unsaturated state. It can still play an EMC suppression role in the charging state, and the energy conversion system can effectively reduce EMC interference.

[0087] In one possible implementation, the energy conversion system may also include several switches and capacitors, etc. See also... Figure 7 , Figure 7 Another schematic diagram of an energy conversion system is shown as an example. Figure 7 As shown, the energy conversion system 1 can also include switches K1, K2, K3, K4, K5, and capacitor C. Switch K1 is located between the first terminal of the bridge arm conversion module 201 and the negative terminal of the DC power supply; switch K2 is located between the first filter component 10 and the positive terminal of the battery; switch K3 is located between the negative terminal of the battery and the first filter component 10; switch K4 is located between the common terminal of the three-phase winding and the positive terminal of the DC power supply; the first terminal of switch K5 is located between the bridge arm conversion module 201 and the negative terminal of the DC power supply, and the second terminal of switch K5 is connected to the first terminal of capacitor C. The second terminal of capacitor C is located between the common connection terminal of the three-phase winding and the positive terminal of the DC power supply.

[0088] In some feasible implementations, when charging the battery module, the control module 30 can also control switches K1, K2, K3, and K4 to be turned on, control switch K5 to be turned off, and control the operation of each of the bridge arm switches to achieve the purpose of charging the battery module based on the voltage provided by the DC power supply.

[0089] Figure 7The working principle of the energy conversion system shown can be referenced. Figure 6 The relevant descriptions will not be repeated here.

[0090] Figure 8 Another schematic diagram of an energy conversion system is shown as an example.

[0091] like Figure 8 As shown, the motor control circuit 20 may include a bridge arm conversion module 201 and a second filter component 202; the first end of the bridge arm conversion module 201 is connected to a DC power supply; the first end of the bridge arm conversion module 201 is connected to the first end of the battery module via the first filter component 10; the second end of the bridge arm conversion module 201 is connected to the second end of the battery module via the first filter component 10; wherein, the midpoints of the bridge arms of the multiple bridge arm switches of the bridge arm conversion module 201 are respectively connected to the multiple first ends of the second filter component 202; the multiple second ends of the second filter component 202 are respectively connected to the three-phase windings in the motor 40; any first end of the second filter component 202 is connected to a DC power supply.

[0092] The control module controls the arm switching action in the arm switching module 201 to drive the motor 40 and charge the battery module based on the DC input voltage provided by the DC power supply.

[0093] In some feasible implementations, the aforementioned bridge arm conversion module 201 includes multiple bridge arm switches connected in parallel. The parallel connection terminals of the multiple bridge arm switches can serve as the input / output terminals of the bridge arm conversion module 201. Each bridge arm switch includes an upper bridge arm switch (also called an upper tube switch) and a lower bridge arm switch (also called a lower tube switch) connected in series. The series connection point of the upper and lower bridge arm switches can serve as the midpoint of the bridge arm of the bridge arm switch. The midpoint of the bridge arm of one of the multiple bridge arm switches can be connected to one phase winding of the three-phase winding of the motor 40. The multiple bridge arm switches here can be made of silicon semiconductor materials (Si), or third-generation wide-bandgap semiconductor materials such as silicon carbide (SiC), gallium nitride (GaN), diamond, zinc oxide (ZnO), or other materials, such as metal-oxide-semiconductor field-effect transistors (MOSFETs) or insulated-gate bipolar transistors (IGBTs). The specific type can be determined according to the actual application scenario and is not limited here. The specific circuit topology of the bridge arm conversion module 201 can also be determined according to the actual application scenario and is not limited here.

[0094] In some feasible implementations, the control module 30 can be integrated with the arm switching module 201 on the same control board or printed circuit board (PCB). This control module 30 (also called an integrated controller) can control the on / off state of the arm switching module 201. The circuit board, also called a PCB, is the support for electronic components and the carrier for their electrical interconnection. The control module 30 can control the arm switch operation (i.e., the on / off state of the arm switch) in the arm switching module 201 to drive the motor 40 to charge the high-voltage and low-voltage batteries based on the input voltage provided by the power supply. The motor 40 can be a motor in an electric vehicle, such as a drive motor, an air conditioning compressor motor, or other motors. Taking an air conditioning compressor motor as an example, the control module 30 can control the arm switch operation in the arm switching module 201 to drive the motor 40 based on the AC input voltage provided by the power supply, allowing the air conditioning system in the electric vehicle to operate normally.

[0095] In some feasible implementations, the above Figure 8 The motor 40 shown may include, but is not limited to, three-phase and six-phase motors. The specific type of motor 40 can be determined according to the actual application scenario and is not limited here. For example, if the motor 40 is a three-phase motor, the multiphase winding can be a three-phase winding; if the motor 40 is a six-phase motor, the multiphase winding can be a six-phase winding. For ease of description, the following explanation will take a three-phase motor 40 as an example, and will not be repeated here.

[0096] about Figure 8 The working principle of the energy conversion system shown can be found below. Figures 9 to 12 Related content.

[0097] Please see Figure 9 , Figure 9 An exemplary diagram is shown when the energy conversion system, battery module and DC power supply are connected by common positive connection.

[0098] Figure 9 Another schematic diagram of an energy conversion system is shown as an example. Figure 9 As shown, the energy conversion system 1 includes a first filter component 10, a motor control circuit 20, a control module 30, and a motor 40. The motor control circuit 20 includes a bridge arm conversion module 201 and a second filter component 202.

[0099] In some feasible implementations, as described above Figure 9As shown, the bridge arm switching module 201 includes, but is not limited to, bridge arm switches 201a, 201b, and 201c. Bridge arm switch 201a includes an upper bridge arm switch S1 and a lower bridge arm switch S2 connected in series, with the midpoint of the bridge arm of switch 201a being the series connection point of the upper bridge arm switch S1 and the lower bridge arm switch S2. Bridge arm switch 201b includes an upper bridge arm switch S3 and a lower bridge arm switch S4 connected in series, with the midpoint of the bridge arm of switch 201b being the series connection point of the upper bridge arm switch S3 and the lower bridge arm switch S4. Bridge arm switch 201c includes an upper bridge arm switch S5 and a lower bridge arm switch S6 connected in series, with the midpoint of the bridge arm of switch 201c being the series connection point of the upper bridge arm switch S5 and the lower bridge arm switch S6.

[0100] The first end of the bridge arm conversion module 201 is connected to the positive terminal of the DC power supply, and the first end of the bridge arm conversion module 201 is connected to the positive terminal of the battery module via the first filter component 10; the negative terminal of the battery module is connected to the second end of the bridge arm conversion module 201 via the first filter component 10; the midpoint of the bridge arm of the bridge arm switch 201a is connected to the winding U of the three-phase winding via the second filter component 202, the midpoint of the bridge arm of the bridge arm switch 201b is connected to the winding V of the three-phase winding via the second filter component 202, and the midpoint of the bridge arm of the bridge arm switch 201c is connected to the winding W of the three-phase winding via the second filter component 202; the connection point between the midpoint of the bridge arm of the bridge arm switch 201a and the second filter component is connected to the negative terminal of the DC power supply.

[0101] In some feasible implementations, the control module 30 may include, but is not limited to, a control board, a control chip, or a controller. The control module 30 can establish a wired or wireless connection with bridge arm switches 201a, 201b, and 201c, depending on the actual application scenario, and is not limited here. The control module 30 can control the operation of each bridge arm switch among bridge arm switches 201a, 201b, and 201c. For example, the control module 30 can turn on bridge arm switches 201b and / or 201c, enabling the motor 40 to be driven and the battery module to be charged based on the DC voltage provided by the DC power supply when both the first filter component 10 and the second filter component 202 are not saturated, thereby effectively reducing EMC interference.

[0102] The following section uses DC power supply to charge a battery module as an example to introduce... Figure 9 The working principle of the energy conversion system shown.

[0103] In one possible implementation, the control module can simultaneously turn on both bridge arm switch 201b and bridge arm switch 201c to enable DC power to charge the battery module.

[0104] At this time, the excitation circuit flows from the positive terminal of the DC power supply to the first end of the bridge arm conversion module 201; then, it splits into two paths. The first current flows from the midpoint of the bridge arm of the upper bridge arm switch S3 to the winding V of the three-phase winding through the second filter component 202; the second current flows from the midpoint of the bridge arm of the upper bridge arm switch S5 to the winding W of the three-phase winding through the second filter component 202; finally, both currents flow out through the winding U and then to the negative terminal of the DC power supply after passing through the second filter component 202.

[0105] As can be seen, the first current and the second current pass through the second filter component in the forward direction and enter the three-phase winding, and then converge through the winding U of the three-phase winding and pass through the second filter component in the reverse direction. Therefore, the sum of the currents passing through the second filter component 202 in the excitation circuit at any time is 0. The first current and the second current do not pass through the first filter component 10. Therefore, the sum of the currents passing through the first filter component 10 in the excitation circuit at any time is 0.

[0106] The flow direction of the freewheeling circuit is as follows: from the positive terminal of the DC power supply, through the first filter component 10, it flows to the positive terminal of the battery module; from the negative terminal of the battery module, through the first filter component 10, it flows to the second terminal of the bridge arm conversion module 201. Then, it splits into two paths: the third current flows through the lower bridge arm switch S4, from the midpoint of the bridge arm of the bridge arm switch 201b, through the second filter component 202, to the winding V of the three-phase winding; the fourth current flows through the lower bridge arm switch S6, from the midpoint of the bridge arm of the bridge arm conversion module 201, through the second filter component 202, to the winding W of the three-phase winding. Then, both currents flow out through the winding U, and after passing through the second filter component 202, they flow to the negative terminal of the DC power supply.

[0107] As can be seen, the third current and the fourth current pass through the second filter component 202 in the forward direction and enter the three-phase winding, and then pass through the second filter component 202 in the reverse direction after merging through the three-phase winding. Therefore, the sum of the currents passing through the second filter component 202 in the freewheeling circuit at any time is 0. The freewheeling circuit passes through the first filter component 10 in both the forward and reverse directions. Therefore, the sum of the currents passing through the first filter component 10 in the freewheeling circuit at any time is 0.

[0108] In summary, during the process of the DC power supply charging the battery module through the above-mentioned energy conversion system, the sum of the currents passing through the first filter component 10 and the sum of the currents passing through the second filter component 202 are both zero at any time. That is, both the first filter component 10 and the second filter component 202 are in an unsaturated state, and can play an EMC suppression effect during the charging state. This energy conversion system can effectively reduce EMC interference.

[0109] In one possible implementation, the energy conversion system may also include several switches and capacitors, etc. See also... Figure 10 , Figure 10Another schematic diagram of an energy conversion system is shown as an example. Figure 10 As shown, the energy conversion system 1 can also include switches K1, K2, K3, K4, K5, and capacitor C. Specifically, the first end of switch K1 is located between the bridge arm conversion module 201 and the first filter component 10, and the second end of switch K1 is connected to the positive terminal of the DC power supply; switch K2 is located between the first filter component 10 and the positive terminal of the battery; switch K3 is located between the negative terminal of the battery and the first filter component 10; switch K4 is located between the second filter component and the negative terminal of the DC power supply; the first end of switch K5 is located between the bridge arm conversion module 201 and the positive terminal of the DC power supply, and the second end of switch K5 is connected to the first end of capacitor C. The second end of the capacitor is located between the common connection terminal of the three-phase winding and the negative terminal of the DC power supply.

[0110] In some feasible implementations, when charging the battery module, the control module 30 can also control switches K1, K2, K3, and K4 to be turned on, control switch K5 to be turned off, and control bridge arm switches 201b and / or 201c to be turned on to achieve the purpose of charging the battery module based on the voltage provided by the DC power supply.

[0111] Figure 10 The working principle of the energy conversion system shown can be referenced. Figure 9 The relevant descriptions will not be repeated here.

[0112] Please see Figure 11 , Figure 11 An exemplary diagram is shown when the energy conversion system, battery module and DC power supply are connected via a common negative connection.

[0113] like Figure 11 As shown, the energy conversion system 1 includes a first filter component 10, a motor control circuit 20, a control module 30, and a motor 40. The motor control circuit 20 includes a bridge arm conversion module 201 and a second filter component 202.

[0114] In some feasible implementations, as described above Figure 11As shown, the bridge arm switching module 201 includes, but is not limited to, bridge arm switches 201a, 201b, and 201c. Bridge arm switch 201a includes an upper bridge arm switch S1 and a lower bridge arm switch S2 connected in series, with the midpoint of the bridge arm of switch 201a being the series connection point of the upper bridge arm switch S1 and the lower bridge arm switch S2. Bridge arm switch 201b includes an upper bridge arm switch S3 and a lower bridge arm switch S4 connected in series, with the midpoint of the bridge arm of switch 201b being the series connection point of the upper bridge arm switch S3 and the lower bridge arm switch S4. Bridge arm switch 201c includes an upper bridge arm switch S5 and a lower bridge arm switch S6 connected in series, with the midpoint of the bridge arm of switch 201c being the series connection point of the upper bridge arm switch S5 and the lower bridge arm switch S6.

[0115] The first end of the bridge arm conversion module 201 is connected to the negative terminal of the DC power supply, and the first end of the bridge arm conversion module 201 is connected to the negative terminal of the battery module via the first filter component 10; the positive terminal of the battery module is connected to the second end of the bridge arm conversion module 201 via the first filter component 10; the midpoint of the bridge arm of the bridge arm switch 201a is connected to the winding U of the three-phase winding via the second filter component 202; the midpoint of the bridge arm of the bridge arm switch 201b is connected to the winding V of the three-phase winding via the second filter component 202; the midpoint of the bridge arm of the bridge arm switch 201c is connected to the winding W of the three-phase winding via the second filter component 202; and the connection point between the midpoint of the bridge arm of the bridge arm switch 201a and the second filter component is connected to the negative terminal of the DC power supply.

[0116] In some feasible implementations, the control module 30 may include, but is not limited to, a control board, a control chip, or a controller. The control module 30 can establish a wired or wireless connection with bridge arm switches 201a, 201b, and 201c, depending on the actual application scenario, and is not limited here. The control module 30 can control the operation of each bridge arm switch among bridge arm switches 201a, 201b, and 201c. For example, the control module 30 can turn on bridge arm switches 201b and / or 201c, thereby achieving the purpose of driving the motor 40 and charging the battery module based on the DC voltage provided by the DC power supply.

[0117] In one possible implementation, the control module can turn on bridge arm switches 201b and 201c to enable DC power to charge the battery module.

[0118] At this time, the excitation circuit flows as follows: from the positive terminal of the DC power supply to the first end of the second filter component 202, and from the second end of the second filter component to the winding U; then, it splits into two paths: the first current flows from the winding V through the second filter component 202 to the midpoint of the bridge arm of the bridge arm switch 201b, and through the lower bridge arm switch S4 from the first end of the bridge arm conversion module 201 to the negative terminal of the DC power supply; the second current flows from the winding W through the second filter component 202 to the midpoint of the bridge arm of the bridge arm switch 201c, and through the lower bridge arm switch S6 from the first end of the bridge arm conversion module 201 to the negative terminal of the DC power supply.

[0119] As can be seen, the excitation circuit enters the winding U through the second filter component 202 in the forward direction, and then splits into two circuits that pass through the second filter component 202 in the reverse direction. Therefore, the sum of the currents in the excitation circuit passing through the second filter component 202 at any time is 0. The excitation circuit does not pass through the first filter component 10, so the sum of the currents in the excitation circuit passing through the first filter component 10 at any time is 0.

[0120] The flow direction of the freewheeling circuit is as follows: from the positive terminal of the DC power supply to the first end of the second filter component 202, and from the second end of the second filter component to the winding U; then, it splits into two paths: the third current flows from the winding V through the second filter component 202 to the midpoint of the bridge arm of the bridge arm switch 201b, and the third current flows out from the second end of the bridge arm conversion module 201 after passing through the upper bridge arm switch S3; the fourth current flows from the winding W through the second filter component 202 to the midpoint of the bridge arm of the bridge arm switch 201c, and flows out from the second end of the bridge arm conversion module 201 after passing through the lower bridge arm switch S6; the total current of the third and fourth currents flowing out from the second end of the bridge arm conversion module 201 flows through the first filter component 10 to the positive terminal of the battery module, and from the negative terminal of the battery module to the negative terminal of the DC power supply through the first filter component.

[0121] As can be seen, the freewheeling circuit enters winding U through the second filter component 202 in the forward direction, and then splits into two circuits that pass through the second filter component 202 in the reverse direction from winding V and winding W respectively. Therefore, the sum of the currents in the freewheeling circuit passing through the second filter component 202 at any time is 0. The freewheeling circuit passes through the first filter component 10 in both the positive and negative directions. Therefore, the sum of the currents in the freewheeling circuit passing through the first filter component 10 at any time is 0.

[0122] In summary, during the process of the DC power supply charging the battery module through the above-mentioned energy conversion system, the sum of the currents passing through the first filter component 10 and the sum of the currents passing through the second filter component 202 are both zero at any time. That is, both the first filter component 10 and the second filter component 202 are in an unsaturated state, and can play an EMC suppression effect during the charging state. This energy conversion system can effectively reduce EMC interference.

[0123] In one possible implementation, the energy conversion system may also include several switches and capacitors, etc. See also... Figure 12 , Figure 12 Another schematic diagram of an energy conversion system is shown as an example. Figure 12 As shown, the energy conversion system 1 can also include switches K1, K2, K3, K4, K5, and capacitor C. Specifically, the first end of switch K1 is located between the bridge arm conversion module 201 and the first filter component 10, and the second end of switch K1 is connected to the negative terminal of the DC power supply; switch K2 is located between the first filter component 10 and the positive terminal of the battery module; switch K3 is located between the negative terminal of the battery module and the first filter component 10; switch K4 is located between the common terminal of the three-phase winding and the positive terminal of the DC power supply; the first end of switch K5 is located between the bridge arm conversion module 201 and the negative terminal of the DC power supply, and the second end of switch K5 is connected to the first end of capacitor C. The second end of capacitor C is located between the common connection terminal of the three-phase winding and the positive terminal of the DC power supply.

[0124] In some feasible implementations, when charging the battery module, the control module 30 can also control switches K1, K2, K3, and K4 to be turned on, control switch K5 to be turned off, and control bridge arm switches 201b and / or 201c to be turned on to achieve the purpose of charging the battery module based on the voltage provided by the DC power supply.

[0125] Figure 12 The working principle of the energy conversion system shown can be referenced. Figure 11 The relevant descriptions will not be repeated here.

[0126] Please see Figure 13A , Figure 13A This is a schematic diagram of the energy conversion system provided in this application.

[0127] like Figure 13A As shown, the energy conversion system 2 includes a motor 10, a common-mode filter component 20, a bridge arm conversion module 30, and a control module 40.

[0128] Multiple connection terminals of the common mode filter component 20 are respectively connected to the midpoint of the bridge arm of multiple bridge arm switches of the bridge arm conversion module 30; multiple connection terminals of the common mode filter component 20 are respectively connected to the three-phase windings in the motor 10; any one of the multiple connection terminals of the common mode filter component 20 is connected to a DC power supply.

[0129] The control module 40 is used to control the arm switching action in the arm switching module 30 to drive the motor 10 and charge the battery module based on the DC input voltage provided by the DC power supply.

[0130] The motor control circuit 20 may include other filtering components or switches; the first filtering component 10 is a common-mode filtering component, such as a common-mode inductor and a common-mode magnetic ring.

[0131] Please see Figure 13B , Figure 13B This is a schematic diagram of the energy conversion system provided in this application.

[0132] like Figure 13B As shown, the energy conversion system 2 includes a motor 10, a common-mode filter component 20, a bridge arm conversion module 30, and a control module 40.

[0133] Multiple connection terminals of the common-mode filter component 20 are respectively connected to the midpoint of the bridge arm of multiple bridge arm switches of the bridge arm conversion module 30; multiple connection terminals of the common-mode filter component 20 are respectively connected to the three-phase windings in the motor 10; any one of the multiple connection terminals of the common-mode filter component 20 is connected to a DC load.

[0134] The control module 40 is used to control the arm switching action in the arm switching module 30 to drive the motor 10 and charge the DC load based on the DC input voltage provided by the battery module.

[0135] The motor control circuit 20 may include other filtering components or switches; the first filtering component 10 is a common-mode filtering component, such as a common-mode inductor and a common-mode magnetic ring.

[0136] The following examples are used Figure 14 introduce Figure 13A The working principle of the energy conversion system shown is illustrated. Please refer to [link / reference]. Figure 14 , Figure 14 An exemplary diagram is shown when the energy conversion system 2, the battery module, and the DC power supply are connected in a common positive connection.

[0137] Figure 14 Another schematic diagram of an energy conversion system is shown as an example. Figure 14 As shown, the energy conversion system 1 includes a motor 10, a common-mode filter component 20, a bridge arm conversion module 30, and a control module 40. The bridge arm conversion module 30 includes bridge arm switches 301, 302, and 303; bridge arm switch 201a includes an upper bridge arm switch S1 and a lower bridge arm switch S2; bridge arm switch 201b includes an upper bridge arm switch S3 and a lower bridge arm switch S4; and bridge arm switch 201c includes an upper bridge arm switch S5 and a lower bridge arm switch S6.

[0138] The first end of the bridge arm conversion module 30 is connected to the positive terminal of the DC power supply, and the first end of the bridge arm conversion module 30 is connected to the positive terminal of the battery module; the negative terminal of the battery module is connected to the second end of the bridge arm conversion module 30; the midpoint of the bridge arm of the bridge arm switch 301 is connected to the winding U of the three-phase winding via the common mode filter component 20; the midpoint of the bridge arm of the bridge arm switch 302 is connected to the winding V of the three-phase winding via the common mode filter component 20; the midpoint of the bridge arm of the bridge arm switch 303 is connected to the winding W of the three-phase winding via the common mode filter component 20; and the connection point between the midpoint of the bridge arm of the bridge arm switch 301 and the common mode filter component 20 is connected to the negative terminal of the DC power supply.

[0139] In some feasible implementations, the control module 30 may include, but is not limited to, a control board, a control chip, or a controller. The control module 30 can establish a wired or wireless connection with the bridge arm switches 301, 302, and 303, depending on the actual application scenario, and is not limited here. The control module 30 can control the operation of each bridge arm switch among bridge arm switches 301, 302, and 303. For example, the control module 30 can turn on bridge arm switches 302 and / or 303, thereby achieving the purpose of driving the motor 40 and charging the battery module based on the DC voltage provided by the DC power supply.

[0140] The following section uses DC power supply to charge a battery module as an example to introduce... Figure 14 The working principle of the energy conversion system shown.

[0141] In one possible implementation, the control module can turn on bridge arm switches 302 and 303 to enable DC power to charge the battery module.

[0142] At this time, the excitation circuit flows from the positive terminal of the DC power supply to the first end of the bridge arm conversion module 30; then, it splits into two paths. The first current flows from the midpoint of the bridge arm of the bridge arm switch 302 through the common mode filter component 20 to the winding V of the three-phase winding after passing through the upper bridge arm switch S3; the second current flows from the midpoint of the bridge arm of the bridge arm switch 303 through the common mode filter component 20 to the winding W of the three-phase winding after passing through the upper bridge arm switch S5; then, both currents flow out through the winding U and flow to the negative terminal of the DC power supply after passing through the common mode filter component 20.

[0143] As can be seen, the first current and the second current enter the three-phase winding through the common-mode filter component 20 in the forward direction, and then converge through the winding U of the three-phase winding before passing through the common-mode filter component 20 in the reverse direction. Therefore, the sum of the currents passing through the common-mode filter component 20 in the excitation circuit at any time is 0.

[0144] The flow direction of the freewheeling circuit is as follows: from the positive terminal of the DC power supply to the positive terminal of the battery module, and from the positive terminal of the battery module to the second terminal of the bridge arm converter module 30; then, it splits into two paths. The third current flows through the lower bridge arm switch S4 and then through the common mode filter component 20 to the winding V of the three-phase winding from the midpoint of the bridge arm of the bridge arm switch 302; the fourth current flows through the lower bridge arm switch S6 and then through the common mode filter component 20 to the winding W of the three-phase winding from the midpoint of the bridge arm of the bridge arm converter module 30; then, both currents flow out through the winding U and then through the common mode filter component 20 to the negative terminal of the DC power supply.

[0145] As can be seen, the third current and the fourth current enter the three-phase winding in the forward direction through the common-mode filter component 20, and then converge in the three-phase winding before passing through the common-mode filter component 20 in the reverse direction. Therefore, the sum of the currents passing through the common-mode filter component 20 in the freewheeling circuit at any time is 0.

[0146] In summary, during the process of the DC power supply charging the battery module through the above energy conversion system, the current through the common-mode filter component 20 is 0 at any time, and the common-mode filter component 20 is in an unsaturated state. It can play an EMC suppression role during the charging state, and the energy conversion system can effectively reduce EMC interference.

[0147] In one possible implementation, the energy conversion system 2 can also be connected to the battery module and DC power supply via a common negative connection. The energy conversion system 2 may also include several switches and capacitors, etc. For specific implementation details, please refer to the relevant content in the above-mentioned energy conversion system 1, which will not be repeated here.

[0148] Further, please see Figure 15 , Figure 15 This is a schematic diagram of the power system provided in this application. The power system provided in this application is applicable to the aforementioned electric equipment, and the specific structure of the power system is as follows: Figure 15 As shown, the power system includes a battery module and an energy conversion system (as described above). Figures 2A to 13B The energy conversion system shown herein includes a battery module that may include, but is not limited to, high-voltage and low-voltage batteries. Here, a high-voltage battery refers to a power source that provides power to electric equipment, and may include, but is not limited to, ternary lithium batteries, lithium iron phosphate batteries, and other high-voltage batteries. Because the aforementioned energy conversion system can simultaneously drive the motor and charge the battery module, or drive the motor independently, or charge the battery module individually in single-phase or three-phase mode, it improves the efficiency and flexibility of the power system, resulting in a simpler structure, higher integration, and lower cost. Furthermore, the aforementioned energy conversion system can integrate the motor and on-board charger, eliminating the need for a high-voltage distribution box, thereby reducing the number of high-voltage components used in the power system, further reducing cost, and increasing applicability.

[0149] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module; the first filter component is a common-mode filter component; the motor control circuit includes a bridge arm conversion module; the bridge arm conversion module includes a first bridge arm switch, which includes a first upper bridge arm switch and a first lower bridge arm switch connected in series; the common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the second filter component, and the second terminal of the first winding is connected to the second terminal of the DC power supply; The first end of the DC power supply is connected to the second end of the DC power supply in sequence through the first upper bridge arm switch, the second filter component and the first winding of the motor, forming an excitation circuit. The first end of the DC power supply is connected to the first end of the battery module through the first filter component, and the second end of the battery module is connected to the second end of the DC power supply in sequence through the first filter component, the first lower bridge arm switch, the second filter component and the first winding of the motor, forming a freewheeling circuit. The control module is used to control the switching actions of the first upper bridge arm switch and the first lower bridge arm switch so that both the excitation circuit and the freewheeling circuit are turned on, so as to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply.

2. The system according to claim 1, characterized in that, The first terminal of the DC power supply is the positive terminal, and the second terminal of the DC power supply is the negative terminal; the first terminal of the battery module is the positive terminal, and the second terminal of the battery module is the negative terminal.

3. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module; the first filter component is a common-mode filter component; the motor control circuit includes a bridge arm conversion module; the bridge arm conversion module includes a first bridge arm switch, which includes a first upper bridge arm switch and a first lower bridge arm switch connected in series; the common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the second filter component, and the second terminal of the first winding is connected to the second terminal of the DC power supply; The second end of the DC power supply is connected to the first end of the DC power supply in sequence through the first winding of the motor, the second filter component and the first lower bridge arm switch to form an excitation circuit. The second end of the DC power supply is connected to the first end of the battery module through the first winding of the motor, the second filter component, the first upper bridge arm switch and the first filter component. The second end of the battery module is connected to the first end of the DC power supply in sequence through the first filter component, forming a freewheeling circuit. The control module is used to control the switching actions of the first upper bridge arm switch and the first lower bridge arm switch so that both the excitation circuit and the freewheeling circuit are turned on, so as to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply.

4. The system according to claim 3, characterized in that, The first terminal of the DC power supply is the negative terminal, and the second terminal of the DC power supply is the positive terminal; the first terminal of the battery module is the negative terminal, and the second terminal of the battery module is the positive terminal.

5. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module. The first filter component is a common-mode filter component. The motor control circuit includes a bridge arm conversion module. The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the second filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the second filter component. The first terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC power supply through a third winding. The first end of the DC power supply is connected to the second end of the DC power supply in sequence through the first upper bridge arm switch, the second filter component, the first winding of the motor, the third winding of the motor, and the second filter component. The first end of the DC power supply is also connected to the second end of the DC power supply in sequence through the second upper bridge arm switch, the second filter component, the second winding of the motor, the third winding of the motor, and the second filter component, forming an excitation circuit. The first end of the DC power supply is connected to the first end of the battery module through the first filter component. The second end of the battery module is connected to the second end of the DC power supply in sequence through the first filter component, the first lower bridge arm switch, the second filter component, the first winding of the motor, the third winding of the motor, and the second filter component. The second end of the battery module is also connected to the second end of the DC power supply in sequence through the first filter component, the second lower bridge arm switch, the second filter component, the second winding of the motor, the third winding of the motor, and the second filter component, forming a freewheeling circuit. The control module is used to control the switching actions of the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch so that the excitation circuit and the freewheeling circuit are both turned on, so as to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply.

6. The system according to claim 5, characterized in that, The first terminal of the DC power supply is the positive terminal, and the second terminal of the DC power supply is the negative terminal; the first terminal of the battery module is the positive terminal, and the second terminal of the battery module is the negative terminal.

7. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module; the first filter component is a common-mode filter component; the motor control circuit includes a bridge arm conversion module; The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the second filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the second filter component. The first terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC power supply through the third winding. The second end of the DC power supply is connected to the first end of the DC power supply in sequence through the second filter component, the third winding of the motor, the first winding of the motor, the second filter component, and the first lower bridge arm switch. The second end of the DC power supply is also connected to the first end of the DC power supply in sequence through the second filter component, the third winding of the motor, the second winding of the motor, the second filter component, and the second lower bridge arm switch, forming an excitation circuit. The second terminal of the DC power supply is connected to the second terminal of the DC power supply in sequence through the second filter component, the third winding of the motor, the first winding of the motor, the second filter component, the first upper bridge arm switch, and the first filter component. The second terminal of the DC power supply is also connected to the second terminal of the DC power supply in sequence through the second filter component, the third winding of the motor, the second winding of the motor, the second filter component, the second upper bridge arm switch, and the first filter component. The first terminal of the DC power supply is connected to the first terminal of the DC power supply through the first filter component, forming a freewheeling circuit. The control module is used to control the switching actions of the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch so that the excitation circuit and the freewheeling circuit are both turned on, so as to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply.

8. The system according to claim 7, characterized in that, The first terminal of the DC power supply is the negative terminal, and the second terminal of the DC power supply is the positive terminal; the first terminal of the battery module is the negative terminal, and the second terminal of the battery module is the positive terminal.

9. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module; the first filter component is a common-mode filter component; the motor control circuit includes a bridge arm conversion module; the bridge arm conversion module includes a first bridge arm switch, which includes a first upper bridge arm switch and a first lower bridge arm switch; the second end of the first upper bridge arm switch and the first end of the first lower bridge arm switch are both connected to the first end of the first winding of the motor through the second filter component, and the second end of the first winding is connected to the second end of the DC load; The first end of the battery module is connected to the first end of the DC load through the first filter component, and the second end of the battery module is connected to the second end of the DC load in sequence through the first filter component, the first lower bridge arm switch, the second filter component and the first winding of the motor. The first end of the DC load is also connected to the second end of the DC load in sequence through the first upper bridge arm switch, the second filter component and the first winding of the motor; The control module is used to control the first upper arm switch and the first lower arm switch in the motor control circuit to drive the motor and charge the DC load based on the input voltage provided by the battery module.

10. The system according to claim 9, characterized in that, The first end of the DC load is the positive terminal of the DC load, and the second end of the DC load is the negative terminal of the DC load; the first end of the battery module is the positive terminal of the battery module, and the second end of the battery module is the negative terminal of the battery module.

11. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module; the first filter component is a common-mode filter component; the motor control circuit includes a bridge arm conversion module; the bridge arm conversion module includes a first bridge arm switch, which includes a first upper bridge arm switch and a first lower bridge arm switch; the second end of the first upper bridge arm switch and the first end of the first lower bridge arm switch are both connected to the first end of the first winding of the motor through the second filter component, and the second end of the first winding is connected to the second end of the DC load; The second end of the battery module is connected to the second end of the DC load through the first filter component, the first upper bridge arm switch, the second filter component, and the first winding of the motor; the second end of the battery module is connected to the first end of the DC load through the first filter component. The second end of the DC load is also connected to the first end of the DC load in sequence through the first winding of the motor, the second filter component, the first lower bridge arm switch and the first filter component; The control module is used to control the first upper arm switch and the first lower arm switch in the motor control circuit to drive the motor and charge the DC load based on the input voltage provided by the battery module.

12. The system according to claim 11, characterized in that, The first end of the DC load is the negative terminal of the DC load, the second end of the DC load is the positive terminal of the DC load, the second end of the battery module is the positive terminal of the battery module, and the neutral line of the motor is connected to the positive terminal of the DC load.

13. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module. The first filter component is a common-mode filter component. The motor control circuit includes a bridge arm conversion module. The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the second filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the second filter component. The second terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC load through a third winding. The first end of the battery module is connected to the first end of the DC load through the first filter component; The second end of the battery module is connected to the second end of the DC load in sequence through the first filter component, the first lower bridge arm switch, the second filter component, the first winding of the motor, the third winding of the motor, and the second filter component; The second end of the battery module is also connected to the second end of the DC load in sequence through the first filter component, the second lower bridge arm switch, the second filter component, the second winding of the motor, the third winding of the motor, and the second filter component; The first end of the DC load is connected to the second end of the DC load in sequence through the first upper bridge arm switch, the second filter component, the first winding of the motor, the third winding of the motor, and the second filter component. The first end of the DC load is also connected to the second end of the DC load in sequence through the second upper bridge arm switch, the second filter component, the second winding of the motor, the third winding of the motor, and the second filter component. The control module is used to control the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch in the motor control circuit to drive the motor and charge the DC load based on the input voltage provided by the battery module.

14. The system according to claim 13, characterized in that, The first end of the DC load is the positive terminal of the DC load, and the second end of the DC load is the negative terminal of the DC load; the first end of the battery module is the positive terminal of the battery module, and the second end of the battery module is the negative terminal of the battery module.

15. An energy conversion system, characterized in that, The energy conversion system includes a first filter component, a motor control circuit, a second filter component, a motor, and a control module. The first filter component is a common-mode filter component. The motor control circuit includes a bridge arm conversion module. The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the second filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the second filter component. The second terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC load through a third winding. The second end of the battery module is connected to the second end of the DC load in sequence through the first filter component, the first upper bridge arm switch, the second filter component, the first winding of the motor, the third winding of the motor, and the second filter component; The second end of the battery module is also connected to the second end of the DC load in sequence through the first filter component, the second upper bridge arm switch, the second filter component, the second winding of the motor, the third winding of the motor, and the second filter component; The first end of the battery module is connected to the first end of the DC load through the first filter component; The second end of the DC load is connected to the first end of the DC load in sequence through the second filter component, the third winding of the motor, the first winding of the motor, the second filter component, and the first lower bridge arm switch. The second end of the DC load is also connected to the first end of the DC load in sequence through the second filter component, the third winding of the motor, the second winding of the motor, the second filter component, and the second lower bridge arm switch. The control module is used to control the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch in the motor control circuit to drive the motor and charge the DC load based on the input voltage provided by the battery module.

16. The system according to claim 15, characterized in that, The first terminal of the DC load is the negative terminal of the DC load, and the second terminal of the DC load is the positive terminal of the DC load; the first terminal of the battery module is the negative terminal of the battery module, and the second terminal of the battery module is the positive terminal of the battery module.

17. An energy conversion system, characterized in that, The energy conversion system includes a bridge arm conversion module, a common-mode filter component, a motor, and a control module. The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the common-mode filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the common-mode filter component. The first terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC power supply through a third winding. The first end of the DC power supply is connected to the second end of the DC power supply in sequence through the first upper bridge arm switch, the common mode filter component, the first winding of the motor, the third winding of the motor, and the common mode filter component. The first end of the DC power supply is also connected to the second end of the DC power supply in sequence through the second upper bridge arm switch, the common mode filter component, the second winding of the motor, the third winding of the motor, and the common mode filter component, forming an excitation circuit. The first terminal of the DC power supply is connected to the first terminal of the battery module. The second terminal of the battery module is connected to the second terminal of the DC power supply in sequence through the first lower bridge arm switch, the common mode filter component, the first winding of the motor, the third winding of the motor, and the common mode filter component. The second terminal of the battery module is also connected to the second terminal of the DC power supply in sequence through the second lower bridge arm switch, the common mode filter component, the second winding of the motor, the third winding of the motor, and the common mode filter component, forming a freewheeling circuit. The control module is used to control the switching actions of the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch so that the excitation circuit and the freewheeling circuit are both turned on, so as to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply.

18. An energy conversion system, characterized in that, The energy conversion system includes a bridge arm conversion module, a common-mode filter component, a motor, and a control module. The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the common-mode filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the common-mode filter component. The first terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC power supply through a third winding. The second terminal of the DC power supply is connected to the first terminal of the DC power supply in sequence through the common-mode filter component, the third winding of the motor, the first winding of the motor, the common-mode filter component, and the first lower bridge arm switch. The second terminal of the DC power supply is also connected to the first terminal of the DC power supply in sequence through the common-mode filter component, the third winding of the motor, the second winding of the motor, the common-mode filter component, and the second lower bridge arm switch, forming an excitation circuit. The second terminal of the DC power supply is connected to the second terminal of the DC power supply in sequence through the common-mode filter component, the third winding of the motor, the first winding of the motor, the common-mode filter component, and the first upper bridge arm switch. The second terminal of the DC power supply is also connected to the second terminal of the DC power supply in sequence through the common-mode filter component, the third winding of the motor, the second winding of the motor, the common-mode filter component, and the second upper bridge arm switch. The first terminal of the DC power supply is connected to the first terminal of the DC power supply, forming a freewheeling circuit. The control module is used to control the switching actions of the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch so that the excitation circuit and the freewheeling circuit are both turned on, so as to drive the motor and charge the battery module based on the DC input voltage provided by the DC power supply.

19. An energy conversion system, characterized in that, The energy conversion system includes a bridge arm conversion module, a common-mode filter component, a motor, and a control module; The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the common mode filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the common mode filter component. The second terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC load through the third winding. The first terminal of the battery module is connected to the first terminal of the DC load. The second end of the battery module is connected to the second end of the DC load in sequence through the first lower bridge arm switch, the common mode filter component, the first winding of the motor, the third winding of the motor, and the common mode filter component; The second end of the battery module is also connected to the second end of the DC load in sequence through the second lower bridge arm switch, the common mode filter component, the second winding of the motor, the third winding of the motor, and the common mode filter component; The first end of the DC load is connected to the second end of the DC load in sequence through the first upper bridge arm switch, the common mode filter component, the first winding of the motor, the third winding of the motor, and the common mode filter component. The first end of the DC load is also connected to the second end of the DC load in sequence through the second upper bridge arm switch, the common mode filter component, the second winding of the motor, the third winding of the motor, and the common mode filter component. The control module is used to control the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch to drive the motor and charge the DC load based on the input voltage provided by the battery module.

20. An energy conversion system, characterized in that, The energy conversion system includes a bridge arm conversion module, a common-mode filter component, a motor, and a control module; The bridge arm conversion module includes a first bridge arm switch and a second bridge arm switch. The first bridge arm switch includes a first upper bridge arm switch and a first lower bridge arm switch connected in series. The second bridge arm switch includes a second upper bridge arm switch and a second lower bridge arm switch connected in series. The common terminal of the first upper bridge arm switch and the first lower bridge arm switch is connected to the first terminal of the first winding of the motor through the common mode filter component. The common terminal of the second upper bridge arm switch and the second lower bridge arm switch is connected to the first terminal of the second winding of the motor through the common mode filter component. The second terminal of the first winding and the second terminal of the second winding are both connected to the second terminal of the DC load through the third winding. The second end of the battery module is connected to the second end of the DC load in sequence through the first upper bridge arm switch, the common mode filter component, the first winding of the motor, the third winding of the motor, and the common mode filter component; The second end of the battery module is also connected to the second end of the DC load in sequence through the second upper bridge arm switch, the common mode filter component, the second winding of the motor, the third winding of the motor, and the common mode filter component; The first end of the battery module is connected to the first end of the DC load. The second terminal of the DC load is connected to the first terminal of the DC load in sequence through the common-mode filter component, the third winding of the motor, the first winding of the motor, the common-mode filter component, and the first lower bridge arm switch. The second terminal of the DC load is also connected to the first terminal of the DC load in sequence through the common-mode filter component, the third winding of the motor, the second winding of the motor, the common-mode filter component, and the second lower bridge arm switch. The control module is used to control the first upper bridge arm switch, the first lower bridge arm switch, the second upper bridge arm switch, and the second lower bridge arm switch to drive the motor and charge the DC load based on the input voltage provided by the battery module.

21. A power system, characterized in that, The power system includes a battery module and an energy conversion system as described in any one of claims 1-20.

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