Energy conversion system and power system

Abstract

The present application provides an energy conversion system and a power system. The energy conversion system may include a motor, a control module, an AC / DC conversion module, a first switch, at least one filter inductor and at least one second switch, wherein the first connection end of a filter inductor may be connected to the first connection end of an AC power source through a second switch. In the case of driving the motor and charging the battery module at the same time, the control module may control the first switch to be disconnected, each of the at least one second switch to be turned on or off, and control the action of each bridge arm switch in the AC / DC conversion module, so as to achieve the purpose of driving the motor based on the voltage provided by the AC power source and charging the battery module. In the present application, the first switch, each second switch and each bridge arm switch may be controlled to work in coordination, so as to achieve the purpose of driving the motor and charging the battery module at the same time, thereby improving the energy conversion efficiency, low cost and strong applicability.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, electric vehicles have become the development trend of new energy vehicles in the future due to their advantages such as high efficiency, energy saving, low noise and zero emission. Since the motor drive circuit (i.e., the circuit used to drive the motor) in the electric vehicle and the battery charging circuit corresponding to the on-board charger (OBC) are independent of each other, the structural layout of the electric vehicle is complex and the integration is low. Therefore, it is particularly important to integrate the motor drive circuit and the battery charging circuit. At present, the power bridge arm in the battery charging circuit can be reused, and multiple relays can be added to the electric vehicle. The motor can be driven or the high-voltage battery and the low-voltage battery can be charged by controlling the conduction or disconnection of the power bridge arm and the multiple relays. However, it is impossible to drive the motor and charge the high-voltage battery and the low-voltage battery at the same time, and the applicability is weak. Summary of the invention

[0003] The present application provides an energy conversion system and a power system, characterized in that the first switch, each second switch and each bridge arm switch can be controlled to work in coordination, so as to achieve the purpose of driving the motor and charging the battery module at the same time, thereby improving the energy conversion efficiency, low cost and strong applicability.

[0004] In a first aspect, the present application provides an energy conversion system, which may include a motor, a control module, an alternating current (AC) / direct current (DC) conversion module, a first switch, at least one filter inductor (i.e., one or more filter inductors) and at least one second switch (i.e., one or more second switches), wherein a first connection end of a filter inductor in the at least one filter inductor can be connected to a first connection end of an AC power source through a second switch in the at least one second switch. The AC / DC conversion module includes but is not limited to a first bridge arm switch and a plurality of second bridge arm switches connected in parallel with the first bridge arm switch, the bridge arm midpoint of the first bridge arm switch can be connected to the second connection end of the AC power supply, the bridge arm midpoint of each of the plurality of second bridge arm switches is coupled (such as directly connected or indirectly connected) to the second connection end of a filter inductor, the bridge arm midpoint of the plurality of second bridge arm switches can be connected to the second connection end of the first filter inductor in at least one filter inductor through the multi-phase winding in the motor, the first filter inductor is any one of the at least one filter inductor, and a first switch is provided between the second connection end of the first filter inductor and the bridge arm midpoint of the second bridge arm switch coupled thereto, and the input / output end of the AC / DC conversion module can be connected to the battery module. In the case of driving the motor and charging the battery module at the same time, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. The above-mentioned control module can be used to control the first switch to be disconnected, each second switch in at least one second switch to be turned on or off, and control the action of the first bridge arm switch and each bridge arm switch in multiple second bridge arm switches, so as to achieve the purpose of driving the motor based on the voltage provided by the AC power supply and charging the battery module.

[0005] In the present application, the first switch, each second switch and each bridge arm switch can be controlled to work in coordination, so as to achieve the purpose of simultaneously driving the motor and charging the battery module, thereby improving the energy conversion efficiency, reducing the resonance existing in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, thereby reducing the system cost, and the structure is simpler and has strong applicability.

[0006] In combination with the first aspect, in a first possible implementation, when the motor is driven and the battery module is charged at the same time, the control module can be used to control the conduction of the second switch connected to the first filter inductor in at least one second switch, control the disconnection of the first switch and other second switches in at least one second switch, and control the action of each bridge arm switch in the first bridge arm switch and multiple second bridge arm switches, so as to achieve the purpose of driving the motor and charging the battery module at the same time. When the second switch coupled with the first filter inductor is turned on and the first switch and other second switches are disconnected, the first filter inductor is connected in series with each phase winding in the motor and serves as the filter inductor of the AC / DC conversion module, and forms a power factor correction circuit with the AC / DC conversion module to improve power utilization, further improving energy conversion efficiency; in addition, in the process of driving the motor and charging the battery module at the same time, the speed of the motor can also be adjusted, which improves the flexibility of the system and makes it more applicable.

[0007] In combination with the first possible implementation of the first aspect, in a second possible implementation, the energy conversion system further includes at least two third switches, each of the at least two third switches is connected in series with a phase winding in the multi-phase winding, and the midpoint of the bridge arm of each of the plurality of second bridge arm switches can be connected to the second connection end of the first filter inductor through a third switch and a phase winding connected in series. In the case of driving the motor and charging the battery module at the same time, the control module can be used to control the conduction of the second switch connected to the first filter inductor and at least two third switches, control the disconnection of the first switch and other second switches, and control the action of the first bridge arm switch and each of the plurality of second bridge arm switches, so as to achieve the purpose of driving the motor and charging the battery module at the same time. When the second switch connected to the first filter inductor and at least two third switches are turned on, and the first switch and other second switches are disconnected, the first filter inductor can be connected in series with each phase winding in the motor and serve as the filter inductor of the AC / DC conversion module, and form a power factor correction (PFC) circuit with the AC / DC conversion module to improve power utilization, thereby further improving energy conversion efficiency. In addition, in the process of driving the motor and charging the battery module at the same time, the speed of the motor can also be adjusted, thereby improving system flexibility and making it more applicable.

[0008] In combination with the second possible implementation of the first aspect, in a third possible implementation, in the case of driving the motor alone, the input / output end of the AC / DC conversion module can be used as the input end of the AC / DC conversion module. The control module is also used to control the first switch and at least one second switch to be disconnected, at least two third switches to be turned on, and to control the action of each of the plurality of second bridge arm switches, so as to achieve the purpose of driving the motor based on the voltage provided by the battery module. In the process of driving the motor, when the first switch and at least one second switch are disconnected and at least two third switches are turned on, the current of the driving motor will not flow through at least one filter inductor, thereby avoiding energy loss and improving the driving efficiency of the motor; in addition, the first switch, at least one second switch, at least two third switches and each second bridge arm switch can be controlled to work together to achieve the purpose of driving the motor alone, which can improve the convenience of driving the motor and make it more applicable.

[0009] In combination with the second possible implementation of the first aspect, in a fourth possible implementation, when charging the battery module alone, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. The control module is also used to control the first switch and at least one second switch to be turned on, at least two third switches to be turned off, and to control the first bridge arm switch and each of the bridge arm switches in the plurality of second bridge arm switches to operate, so as to achieve the purpose of charging the battery module based on the voltage provided by the AC power supply. When the first switch and at least one second switch are turned on and at least two third switches are turned off, at least one filter inductor can be used as the filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the multi-phase winding in the motor, so there is no need to reuse the multi-phase winding in the motor as the filter inductor of the AC / DC conversion module in the process of charging the battery module, that is, there is no need to customize and design the multi-phase winding in the motor, further reducing the design complexity and system cost of the motor. In addition, the first switch, at least one second switch, at least two third switches and each bridge arm switch can be controlled to work in coordination to achieve the purpose of charging the battery module, thereby improving the convenience and efficiency of battery charging and having greater applicability.

[0010] In the second aspect, the present application provides an energy conversion system, which includes a motor, a control module, an AC / DC conversion module, a first switch, at least one filter inductor and at least one second switch, wherein one of the at least one filter inductor is connected in series with one of the at least one second switch and then connected to the first connection end of the AC power supply, and the motor includes a multi-phase winding. Wherein, the AC / DC conversion module includes but is not limited to a first bridge arm switch and a plurality of second bridge arm switches connected in parallel with the first bridge arm switch, the bridge arm midpoint of the first bridge arm switch can be connected to the second connection end of the AC power supply, the bridge arm midpoint of each second bridge arm switch in the plurality of second bridge arm switches can be connected to a target second switch in at least one second switch through a filter inductor and a phase winding in the multi-phase winding, the target second switch is any one of the at least one second switch, and a first switch is provided between the target second switch and the filter inductor connected in series therewith, and the input / output end of the AC / DC conversion module can be connected to a battery module. In the case of driving the motor and charging the battery module at the same time, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. The control module can be used to control the first switch to be disconnected, the second switches in at least one second switch to be turned on or off, and the first bridge arm switch and the bridge arm switches in the plurality of second bridge arm switches to operate, so as to achieve the purpose of driving the motor and charging the battery module based on the voltage provided by the AC power supply. In the present application, the first switch, the second switches and the bridge arm switches can be controlled to work in coordination, so as to achieve the purpose of driving the motor and charging the battery module at the same time, thereby improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, thereby reducing the system cost, making the structure simpler and more applicable.

[0011] In combination with the second aspect, in a first possible implementation, when the motor is driven and the battery module is charged at the same time, the control module can be used to control the target second switch in at least one second switch to be turned on, control the first switch and other second switches in at least one second switch to be turned off, and control the first bridge arm switch and each bridge arm switch in the plurality of second bridge arm switches to operate, so as to achieve the purpose of driving the motor and charging the battery module at the same time. When the target second switch is turned on and the first switch and other second switches are turned off, each phase winding in the motor can be connected in series with each filter inductor in the at least one filter inductor as the filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve power utilization, further improving energy conversion efficiency; in addition, in the process of driving the motor and charging the battery module at the same time, the speed of the motor can also be adjusted, which improves the flexibility of the system and makes it more applicable.

[0012] In combination with the first possible implementation of the second aspect, in a second possible implementation, the energy conversion system further includes at least two third switches, each of the at least two third switches is connected in series with a phase winding in the multi-phase winding, and each of the at least one filter inductor is connected to the target second switch through a third switch and a phase winding connected in series. In the case of driving the motor and charging the battery module at the same time, the control module can be used to control the target second switch and at least two third switches to be turned on, control the first switch and other second switches to be turned off, and control the first bridge arm switch and each bridge arm switch in the plurality of second bridge arm switches to act, thereby achieving the purpose of driving the motor and charging the battery module at the same time. When the target second switch and at least two third switches are turned on and the first switch and other second switches are turned off, each phase winding in the motor can be connected in series with each filter winding in the at least one filter inductor as a filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve power utilization, further improving energy conversion efficiency; in addition, in the process of driving the motor and charging the battery module at the same time, the speed of the motor can also be adjusted, which improves the flexibility of the system and makes it more applicable.

[0013] In combination with the second possible implementation of the second aspect, in a third possible implementation, in the case of driving the motor alone, the input / output end of the AC / DC conversion module can be used as the input end of the AC / DC conversion module. The control module is also used to control the first switch and at least one second switch to be disconnected, at least two third switches to be turned on, and to control the action of each of the plurality of second bridge arm switches, so as to achieve the purpose of driving the motor based on the voltage provided by the battery module. In the process of driving the motor, when the first switch and at least one second switch are disconnected and at least two third switches are turned on, the at least one filter inductor can be used as the filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve the power utilization rate, thereby improving the driving efficiency of the motor; in addition, the first switch, at least one second switch, at least two third switches and each second bridge arm switch can be controlled to work together to achieve the purpose of driving the motor alone, which can improve the convenience of driving the motor and make it more applicable.

[0014] In combination with the second possible implementation of the second aspect, in a fourth possible implementation, when charging the battery module alone, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. The control module is also used to control the first switch and at least one second switch to be turned on, at least two third switches to be turned off, and to control the first bridge arm switch and each of the plurality of second bridge arm switches to operate, so as to achieve the purpose of charging the battery module based on the voltage provided by the AC power supply. When the first switch and at least one second switch are turned on and at least two third switches are turned off, at least one filter inductor can be used as the filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the multi-phase winding in the motor, so that in the process of charging the battery module, there is no need to reuse the multi-phase winding in the motor as the filter inductor of the AC / DC conversion module, that is, there is no need to customize and design the multi-phase winding in the motor, which further reduces the design complexity and system cost of the motor. In addition, the first switch, at least one second switch, at least two third switches and each bridge arm switch can be controlled to work in coordination to achieve the purpose of charging the battery module, thereby improving the convenience and efficiency of battery charging and having greater applicability.

[0015] In the third aspect, the present application provides an energy conversion system, which includes a motor, a control module, an AC / DC conversion module, a first switch, at least one filter inductor and at least one second switch, wherein the first connection end of one of the at least one filter inductor can be connected to the first connection end of the AC power supply through one of the at least one second switch. Wherein, the AC / DC conversion module includes but is not limited to a first bridge arm switch and a plurality of second bridge arm switches connected in parallel with the first bridge arm switch, the bridge arm midpoint of the first bridge arm switch can be connected to the second connection end of the AC power supply, the bridge arm midpoint of each of the plurality of second bridge arm switches is connected to the second connection end of a filter inductor, the bridge arm midpoints of the plurality of second bridge arm switches can be connected to the first connection end of the first switch through the multi-phase winding in the motor, and the second connection end of the first switch is connected to the first connection end of the AC power supply, and the input / output end of the AC / DC conversion module can be connected to the battery module. In the case of driving the motor and charging the battery module at the same time, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. The control module can be used to control the first switch to be turned on, at least one second switch to be turned off, and to control the action of each of the first bridge arm switch and the plurality of second bridge arm switches, so as to achieve the purpose of driving the motor and charging the battery module based on the voltage provided by the AC power supply. In the present application, the first switch, at least one second switch and each bridge arm switch can be controlled to work in coordination, so as to achieve the purpose of driving the motor and charging the battery module at the same time, thereby improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, thereby reducing the system cost, making the structure simpler and more applicable.

[0016] In combination with the third aspect, in a first possible implementation, the energy conversion system further includes at least one third switch, each of the at least one third switch is connected in series with a phase winding in the multi-phase winding, and the midpoint of the bridge arm of each of the plurality of second bridge arm switches can be connected to the first connection end of the first switch through a third switch and a phase winding connected in series. In the case of driving the motor and charging the battery module at the same time, the control module can be used to control the first switch and at least one third switch to be turned on, at least one second switch to be turned off, and control the first bridge arm switch and each bridge arm switch in the plurality of second bridge arm switches to act, so as to achieve the purpose of driving the motor based on the voltage provided by the AC power supply and charging the battery module. When the first switch and at least one third switch are turned on and at least one second switch is turned off, the multi-phase winding in the motor can be used as a filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve the power utilization rate, further improving the energy conversion efficiency; in addition, in the process of driving the motor and charging the battery module at the same time, the speed of the motor can also be adjusted, which improves the flexibility of the system and makes it more applicable.

[0017] In combination with the first possible implementation of the third aspect, in a second possible implementation, in the case of driving the motor alone, the input / output end of the AC / DC conversion module can be used as the input end of the AC / DC conversion module. The control module is also used to control the first switch and at least one second switch to be disconnected, at least one third switch to be turned on, and to control the action of each second bridge arm switch in the plurality of second bridge arm switches, so as to achieve the purpose of driving the motor based on the voltage provided by the battery module. In the process of driving the motor, when the first switch and at least one third switch are turned on and at least one second switch is turned off, the current of the driving motor will not flow through at least one filter inductor, thereby avoiding energy loss and improving the driving efficiency of the motor; in addition, the first switch, at least one second switch, at least one third switch and each second bridge arm switch can be controlled to work together to achieve the purpose of driving the motor alone, which can improve the convenience of driving the motor and make it more applicable.

[0018] In combination with the first possible implementation of the third aspect, in a third possible implementation, when charging the battery module alone, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. The control module is also used to control the first switch and at least one third switch to be disconnected, at least one second switch to be turned on, and to control the first bridge arm switch and each of the plurality of second bridge arm switches to operate, so as to achieve the purpose of charging the battery module based on the voltage provided by the AC power supply. When the first switch and at least one third switch are disconnected and at least one second switch is turned on, at least one filter inductor can be used as the filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the multi-phase winding in the motor, so that in the process of charging the battery module, there is no need to reuse the multi-phase winding in the motor as the filter inductor of the AC / DC conversion module, that is, there is no need to customize and design the multi-phase winding in the motor, which further reduces the design complexity and system cost of the motor. In addition, the first switch, at least one second switch, at least one third switch and each bridge arm switch can be controlled to work in coordination to achieve the purpose of charging the battery module, thereby improving the convenience and efficiency of battery charging and having greater applicability.

[0019] In a fourth aspect, the present application provides an energy conversion system, which includes a motor, a control module, an AC / DC conversion module, at least one filter inductor (i.e., one or more filter inductors) and at least one switch (i.e., one or more switches). The AC / DC conversion module includes but is not limited to a first bridge arm switch and a plurality of second bridge arm switches connected in parallel with the first bridge arm switch, the bridge arm midpoint of the first bridge arm switch can be connected to the first connection end of the AC power supply, the bridge arm midpoints of the plurality of second bridge arm switches can be connected to the first connection end of the multi-phase winding in the motor, and the second connection ends of each phase winding in the multi-phase winding are connected, the bridge arm midpoints of the plurality of second bridge arm switches can be connected to the second connection end of the AC power supply through at least one filter inductor and at least one switch, and the input / output end of the AC / DC conversion module can be connected to a battery module. In the case of driving the motor and charging the battery module at the same time, the control module can be used to control each switch in at least one switch to be turned on or off, and control the first bridge arm switch and each bridge arm switch in the plurality of second bridge arm switches to act, so as to achieve the purpose of driving the motor based on the voltage provided by the AC power supply and charging the battery module. At this time, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. In the present application, the switches and bridge arm switches can be controlled to work together to achieve the purpose of driving the motor and charging the battery module at the same time, thereby improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, and there is no need to reuse the multi-phase windings in the motor as filter inductors, that is, there is no need to customize and design the multi-phase windings in the motor, which greatly reduces the system cost and the design complexity of the motor, and the structure is simpler and has strong applicability.

[0020] In combination with the fourth aspect, in a first possible implementation, the at least one filter inductor includes a first filter inductor and at least one second filter inductor, the at least one switch includes a first switch and at least one second switch, and each second filter inductor in the at least one second filter inductor is connected in series with a second switch in the at least one second switch. Wherein, the bridge arm midpoint of the target second bridge arm switch in the plurality of second bridge arm switches can be connected to the second connection end of the AC power supply through the first filter inductor and the first switch, the target second bridge arm switch is any second bridge arm switch in the plurality of second bridge arm switches, and the bridge arm midpoint of each second bridge arm switch in the other second bridge arm switches can be connected to the first switch through a second filter inductor and a second switch in series, and the other second bridge arm switches refer to the second bridge arm switches in the plurality of second bridge arm switches except the target second bridge arm switch. In the case of driving the motor and charging the battery module at the same time, the control module can control the module to control the first switch to be turned on, at least one second switch to be turned off, and control the first bridge arm switch and each bridge arm switch in the plurality of second bridge arm switches to act, thereby achieving the purpose of driving the motor and charging the battery module at the same time. When the first switch is turned on and at least one second switch is turned off, the first filter inductor can be used as the filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve power utilization, further improve energy conversion efficiency, and have stronger applicability.

[0021] In combination with the fourth aspect or the first possible implementation of the fourth aspect, in a second possible implementation, in the case of driving the motor alone, the control module is also used to control at least one switch to be disconnected, and to control the action of each of the plurality of second bridge arm switches, so as to achieve the purpose of driving the motor based on the voltage provided by the battery module. At this time, the input / output end of the AC / DC conversion module can be used as the input end of the AC / DC conversion module. When at least one switch is disconnected, the current driving the motor will not flow through at least one filter inductor, thereby avoiding energy loss and improving the driving efficiency of the motor; in addition, the at least one switch and each second bridge arm switch can be controlled to work in coordination to achieve the purpose of driving the motor alone, which can improve the convenience of driving the motor and make it more applicable.

[0022] In combination with the fourth aspect or the first possible implementation of the fourth aspect, in a third possible implementation, when charging the battery module alone, the control module is further used to control at least one switch to be turned on, and to control the first bridge arm switch and each of the plurality of second bridge arm switches to operate, so as to achieve the purpose of charging the battery module based on the voltage provided by the AC power supply. At this time, the input / output end of the AC / DC conversion module can be used as the output end of the AC / DC conversion module. When the at least one switch is turned on, at least one filter inductor can be used as the filter inductor of the AC / DC conversion module, and form a power factor correction circuit with the AC / DC conversion module to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the multi-phase winding in the motor, so there is no need to reuse the multi-phase winding in the motor as the filter inductor of the AC / DC conversion module during the charging of the battery module, that is, there is no need to customize and design the multi-phase winding in the motor, further reducing the design complexity and system cost of the motor. In addition, the at least one switch and each bridge arm switch can be controlled to work in coordination to achieve the purpose of charging the battery module, thereby improving the convenience and charging efficiency of the battery charging, and having stronger applicability.

[0023] In a fifth aspect, the present application provides a power system, which includes a battery module and an energy conversion system provided in any one of the third possible implementations of the first to fourth aspects above, where the battery module may include a high-voltage battery (also referred to as a power battery) and a low-voltage battery. The power system here is suitable for electric devices, which may include but are not limited to electric vehicles, electric amusement equipment, electric trains, electric bicycles, golf carts or other electric devices. Since the energy conversion system can drive the motor and charge the battery module at the same time, or drive the motor alone, or charge the battery module alone, the working efficiency and flexibility of the power system can be improved, the structure is simpler, the cost is low, and the applicability is strong.

[0024] In the present application, the first switch, at least one second switch, at least two third switches and each bridge arm switch can be controlled to work in coordination, thereby driving the motor and charging the battery module at the same time, or driving the motor alone, or charging the battery module alone, thereby improving the flexibility of the entire energy conversion system, improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, thereby reducing the system cost, making the structure simpler and more applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of an application scenario of the energy conversion system provided by the present application;

[0026] Figure 2 It is a structural schematic diagram of the energy conversion system provided by the present application;

[0027] Figure 3 is another structural schematic diagram of the energy conversion system provided by the present application;

[0028] Figure 4 is another structural schematic diagram of the energy conversion system provided by the present application;

[0029] Figure 5 is another structural schematic diagram of the energy conversion system provided by the present application;

[0030] Figure 6 is another structural schematic diagram of the energy conversion system provided by the present application;

[0031] Figure 7 is another structural schematic diagram of the energy conversion system provided by the present application;

[0032] Figure 8 is another structural schematic diagram of the energy conversion system provided by the present application;

[0033] Fig. 9 is another structural schematic diagram of the energy conversion system provided by the present application;

[0034] Fig.10 is another structural schematic diagram of the energy conversion system provided by the present application;

[0035] Fig.11 is another structural schematic diagram of the energy conversion system provided by the present application;

[0036] Fig.12 is another structural schematic diagram of the energy conversion system provided by the present application;

[0037] Fig.13 is another structural schematic diagram of the energy conversion system provided by the present application;

[0038] Fig.14 It is a structural schematic diagram of the power system provided in this application. DETAILED DESCRIPTION

[0039] 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, so as to realize charging of high-voltage batteries and low-voltage batteries, driving motors, or driving motors and charging of high-voltage batteries and low-voltage batteries at the same time, wherein the electric devices may include but are not limited to electric vehicles, electric amusement equipment, electric trains, electric bicycles, golf carts or other electric devices, which can be determined according to the actual application scenario and are not limited here. The energy conversion system provided in this application can be adapted to different application scenarios, such as electric vehicle application scenarios and electric amusement equipment application scenarios, etc. This application will be explained by taking the electric vehicle application scenario as an example.

[0040] Please also see Figure 1 , Figure 1 Schematic diagram of the application scenario of the energy conversion system provided by this application. In the application scenario of electric vehicles, Figure 1 As shown, the electric vehicle includes a high-voltage battery (also referred to as a power battery), a low-voltage battery (also referred to as a low-voltage storage battery) and an energy conversion system, wherein the motor in the energy conversion system can be understood as the motor in the electric vehicle (such as an air-conditioning compressor motor). In the case where the high-voltage battery and the low-voltage battery need to be charged, the energy conversion system can provide DC power to the high-voltage battery and the low-voltage battery to charge the high-voltage battery and the low-voltage battery. After the high-voltage battery is fully charged, the high-voltage battery can provide DC power to the driving motor used in the electric vehicle, and the driving motor can convert the DC power provided by the high-voltage battery into mechanical energy to drive the electric vehicle to travel. In the case where the motor needs to be driven, other functional modules in the energy conversion system can provide AC power to the motor to drive the motor to work, and the air-conditioning refrigeration system in the electric vehicle can work normally. Optionally, the energy conversion system can also drive the motor and charge the high-voltage battery and the low-voltage battery, thereby realizing the charging of the battery while the air-conditioning refrigeration system is working, meeting the different needs of electric vehicles, and simplifying the structural layout of electric vehicles, with low cost, small size, high integration, and greater applicability.

[0041] The following will be combined Figures 2 to 14 The energy conversion system, power system and their working principles provided in this application are illustrated.

[0042] See also Figure 2 , Figure 2 Schematic diagram of the energy conversion system provided by this application. Figure 2As shown, the energy conversion system includes a motor 10, a control module 20, an AC / DC conversion module 30, a first switch K1, at least one filter inductor (such as filter inductors L1a to L1n) and at least one second switch (such as second switches K2a to K2n), and the first connection end of one of the filter inductors L1a to L1n can be connected to the first connection end of the AC power source Vg through one of the second switches K2a to K2n. Wherein, the AC power source Vg can be understood as a device for energizing the energy conversion system based on the AC power provided by the mains, for example, the AC power source Vg may include but is not limited to an AC power grid or an AC charging pile. For example, the first connection end of the filter inductor L1a can be connected to the first connection end of the AC power source Vg through the second switch K2a, the first connection end of the filter inductor L1b can be connected to the first connection end of the AC power source Vg through the second switch K2b, ..., the first connection end of the filter inductor L1n can be connected to the first connection end of the AC power source Vg through the second switch K2n. It can be seen that the filter inductors L1a to L1n correspond to the second switches K2a to K2n one by one; and the number of the filter inductors L1a to L1n is the same as the number of the second switches K2a to K2n.

[0043] In some feasible implementations, as described above Figure 2As shown, the AC / DC conversion module 30 includes but is not limited to a first bridge arm switch 301 and a plurality of second bridge arm switches (such as second bridge arm switches 302a to second bridge arm switches 302n) connected in parallel with the first bridge arm switch 301. In other words, the first bridge arm switch 301 and the second bridge arm switches 302a to second bridge arm switches 302n are connected in parallel. Among them, the first bridge arm switch 301 includes an upper bridge arm switch S11 and a lower bridge arm switch S12 connected in series, the bridge arm midpoint of the first bridge arm switch 301 refers to the series connection point of the upper bridge arm switch S11 and the lower bridge arm switch S12, and the upper bridge arm switch S11 and the lower bridge arm switch S12 are complementary conductive; the second bridge arm switch 302a includes an upper bridge arm switch S21 and a lower bridge arm switch S22 connected in series, the bridge arm midpoint of the second bridge arm switch 302a refers to the series connection point of the upper bridge arm switch S21 and the lower bridge arm switch S22, and the upper bridge arm switch S21 and the lower bridge arm switch S22 are complementary conductive; the second bridge arm switch 302a The switch 302b includes an upper bridge arm switch S23 and a lower bridge arm switch S24 connected in series, and the bridge arm midpoint of the second bridge arm switch 302b refers to the series connection point of the upper bridge arm switch S23 and the lower bridge arm switch S24, and the upper bridge arm switch S23 and the lower bridge arm switch S24 are complementarily conductive; ..., the second bridge arm switch 302n includes an upper bridge arm switch S2q-1 and a lower bridge arm switch S2q connected in series, and the bridge arm midpoint of the second bridge arm switch 302n refers to the series connection point of the upper bridge arm switch S2q-1 and the lower bridge arm switch S2q, and the upper bridge arm switch S2q-1 and the lower bridge arm switch S2q are complementarily conductive. The bridge arm midpoint of the first bridge arm switch 301 can be connected to the second connection end of the AC power source Vg, and the bridge arm midpoint of each second bridge arm switch from the second bridge arm switch 302a to the second bridge arm switch 302n is coupled (such as directly connected or indirectly connected) to the second connection end of one of the filter inductors L1a to the filter inductors L1n. For example, the bridge arm midpoint of the second bridge arm switch 302a is indirectly connected to the second connection end of the filter inductor L1a, the bridge arm midpoint of the second bridge arm switch 302b is directly connected to the second connection end of the filter inductor L1b, ..., and the bridge arm midpoint of the second bridge arm switch 302n is directly connected to the second connection end of the filter inductor L1n.

[0044] In some feasible implementations, the bridge arm midpoints of the second bridge arm switches 302a to 302n can be connected to the second connection end of the first filter inductor in the filter inductor L1a to the filter inductor L1n through the multi-phase windings (such as windings Z1a to Z1n) in the motor 10, and a first switch K1 is provided between the second connection end of the first filter inductor and the bridge arm midpoint of the second bridge arm switch coupled thereto. The first filter inductor refers to any one of the filter inductors L1a to L1n, such as the above Figure 2As shown, the first filter inductor can be a filter inductor L1a. At this time, the bridge arm midpoint of the second bridge arm switch 302a can be connected to the second connection end of the filter inductor L1a through the winding Z1a, and the bridge arm midpoint of the second bridge arm switch 302a is indirectly connected to the second connection end of the filter inductor L1a through the first switch K1, wherein the first switch K1 is connected in parallel with the winding Z1a; the bridge arm midpoint of the second bridge arm switch 302b can be connected to the second connection end of the filter inductor L1a through the winding Z1b; ..., the bridge arm midpoint of the second bridge arm switch 302n can be connected to the second connection end of the filter inductor L1a through the winding Z1n. It can be seen that the second bridge arm switch 302a to the second bridge arm switch 302n and the winding Z1a to the winding Z1n correspond one to one; and the number of the second bridge arm switch 302a to the second bridge arm switch 302n is the same as the number of the winding Z1a to the winding Z1n. The input / output end of the above-mentioned AC / DC conversion module 30 can be connected to the battery module, wherein the input / output end of the AC / DC conversion module 30 can be understood as the parallel connection end of the first bridge arm switch 301 and the second bridge arm switch 302a to the second bridge arm switch 302n.

[0045] In some feasible embodiments, the control module 20 may include but is not limited to a control board, a control chip or a controller; the control module 20 may establish a wired connection or a wireless connection with the first switch K1, the second switch K2a to the second switch K2n, the first bridge arm switch 301, and the second bridge arm switch 302a to the second bridge arm switch 302n, which may be determined according to the actual application scenario and is not limited here. In the case of driving the motor 10 and charging the battery module at the same time, the input / output end of the AC / DC conversion module 30 may be used as the output end of the AC / DC conversion module 30. The control module 20 may control the first switch K1 to be disconnected, control each second switch from the second switch K2a to the second switch K2n to be turned on or off, and control the first bridge arm switch 301 and each bridge arm switch from the second bridge arm switch 302a to the second bridge arm switch 302n to act, thereby achieving the purpose of driving the motor 10 based on the voltage provided by the AC power supply Vg and charging the battery module. Among them, the turning on or off of each second switch in the second switch K2a to the second switch K2n can be understood as: each second switch in the second switch K2a to the second switch K2n can be turned on or off, that is, each second switch has two working states (i.e., the on state or the off state), and it should be noted that the working states of different second switches in the second switch K2a to the second switch K2n can be the same or different. In the case of driving the motor 10 and charging the battery module at the same time, a part of the second switches in the second switch K2a to the second switch K2n are turned on (i.e., a part of the second switches are in the on state), and another part of the second switches in the second switch K2a to the second switch K2n are turned off (i.e., another part of the second switches are in the off state).

[0046] In some feasible implementations, when a portion of the second switches K2a to K2n are turned on, the first switch K1 and another portion of the second switches K2a to K2n are turned off, and the second bridge arm switches 302a to 302n cooperate to obtain a differential mode voltage based on the voltage provided by the AC power source Vg to drive the motor 10. The coordinated action of the second bridge arm switches can be understood as: the upper bridge arm switches in the second bridge arm switches are turned off, and the lower bridge arm switches in the second bridge arm switches are turned on, for example, the upper bridge arm switches S21, the upper bridge arm switches S23, ..., and the upper bridge arm switch S2q-1 are turned off, and the lower bridge arm switches S22, the lower bridge arm switches S24, ..., and the lower bridge arm switch S2q are turned on. When a part of the second switches among the second switches K2a to the second switches K2n are turned on, another part of the second switches among the first switch K1 and the second switches K2a to the second switches K2n are turned off, and the first bridge arm switch 301 and the bridge arm switches among the second bridge arm switches 302a to the second bridge arm switches 302n cooperate to achieve the purpose of obtaining a common mode voltage based on the voltage provided by the AC power supply Vg to charge the battery module. Among them, the coordinated action of each bridge arm switch can be understood as: the upper bridge arm switch S11 of the first bridge arm switch 301 is turned on, the lower bridge arm switch S12 is turned off, the upper bridge arm switch of each second bridge arm switch among the second bridge arm switches 302a to the second bridge arm switch 302n is turned off, and the lower bridge arm switch of each second bridge arm switch is turned on, for example, the upper bridge arm switch S21, the upper bridge arm switch S23, ..., and the upper bridge arm switch S2q-1 are turned off, and the lower bridge arm switch S22, the lower bridge arm switch S24, ..., and the lower bridge arm switch S2q are turned on.

[0047] It can be seen that the control module 20 can control the first switch K1, each second switch among the second switches K2a to the second switch K2n, and each bridge arm switch among the first bridge arm switch 301 and the second bridge arm switch 302a to the second bridge arm switch 302n to work in coordination, thereby achieving the purpose of obtaining a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 10, and also achieving the purpose of obtaining a common mode voltage based on the voltage provided by the AC power supply Vg to charge the battery module, that is, achieving the purpose of driving the motor 10 and charging the battery module at the same time, thereby improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, thereby reducing the system cost, and the structure is simpler and has strong applicability.

[0048] In some feasible embodiments, for the entire energy conversion system, the energy conversion system can integrate the motor 10, the filter inductor L1a to the filter inductor L1n and the AC / DC conversion module 30, wherein the above-mentioned filter inductor L1a to the filter inductor L1n and the AC / DC conversion module 30 can constitute the on-board charger in the above-mentioned electric vehicle, that is, the energy conversion system can integrate the motor 10 and the on-board charger, and there is no need to use a high-voltage distribution box to integrate the motor 10 and the on-board charger, thereby greatly reducing the number of high-voltage components used in the energy conversion system and making the structure simpler; secondly, the energy conversion system uses a control module 20 to realize the simultaneous operation of the motor 10 and the on-board charger (which can charge the battery module), thereby greatly reducing the controller cost and having strong applicability. In addition, the energy conversion system can reuse the first bridge arm switch 301 and each bridge arm switch from the second bridge arm switch 302a to the second bridge arm switch 302n to realize the simultaneous operation of the motor 10 and the on-board charger. That is to say, the high-voltage output part of the on-board charger and the high-voltage input part of the motor 10 share the signal circuit (that is, the circuit composed of each bridge arm switch), thereby reducing the high-voltage network resonance point of the energy conversion system, further improving the system stability, and making it more applicable.

[0049] In some feasible implementations, the second switches K2a to K2n include a second switch (such as the second switch K2a) connected to the filter inductor L1a (i.e., the first filter inductor) and other second switches (such as the second switches K2b to K2n), and the filter inductors L1a to L1n include the filter inductor L1a (i.e., the first filter inductor) and other filter inductors (such as the filter inductors L1b to L1n). The filter inductor L1a can be connected to the arm midpoint of the second bridge arm switch 302a through the first switch K1, and the second connection end of each filter inductor in the filter inductors L1b to L1n can be connected to the arm midpoint of one of the other second bridge arm switches. For example, the second connection end of the filter inductor L1b can be connected to the arm midpoint of the second bridge arm switch 302b, ..., and the second connection end of the filter inductor L1n can be connected to the arm midpoint of the second bridge arm switch 302n. When driving the motor 10 and charging the battery module at the same time, the control module 20 can control the second switch K2a (i.e., a part of the second switches among the second switches K2a to K2n) to be turned on, control the first switch K1 and the second switch K2b to K2n (i.e., another part of the second switches among the second switches K2a to K2n) to be turned off, and control the first bridge arm switch 301 and each bridge arm switch among the second bridge arm switches 302a to 302n to operate, thereby achieving the purpose of driving the motor 10 and charging the battery module at the same time. When the second switch K2a is turned on and the first switch K1 and the second switch K2b to the second switch K2n are turned off, the filter inductor L1a is respectively connected in series with each phase winding in the above-mentioned windings Z1a to Z1n to serve as the filter inductor of the AC / DC conversion module 30, and constitutes a power factor correction circuit with the AC / DC conversion module 30 to improve power utilization, thereby further improving energy conversion efficiency; in addition, the above-mentioned control module 20 can also adjust the speed of the motor 10 while driving the motor 10 and charging the battery module at the same time, thereby improving system flexibility and enhancing applicability.

[0050] In some feasible implementations, the above Figure 2The energy conversion system shown may also include at least two third switches, and each of the at least two third switches is connected in series with a phase winding among the above-mentioned windings Z1a to Z1n. It can be understood that the number of at least two third switches is the same as the number of windings Z1a to Z1n and corresponds one to one; or, the number of at least two third switches is the difference between the number of windings Z1a to Z1n and 1, that is, one of the phase windings among windings Z1a to Z1n may not be connected in series with the third switch, and the one-phase winding refers to the winding Z1a connected to the above-mentioned second bridge arm switch 302a (that is, the bridge arm switch connected to the first switch K1). It should be noted that the specific number of the above-mentioned at least two third switches can be determined according to the actual application scenario and is not limited here. Please refer to Figure 3 , Figure 3 It is another structural schematic diagram of the energy conversion system provided by this application.

[0051] In some possible implementations, such as Figure 3 As shown above Figure 2 The energy conversion system shown also includes at least two third switches (such as third switches K3a to third switches K3t), each of the third switches K3a to third switches K3t is connected in series with one phase winding of the above windings Z1a to Z1n, or one phase winding (such as winding Z1a) is not connected in series with the third switch. For example, winding Z1a is not connected in series with the third switch, the third switch K3a is connected in series with winding Z1b, ..., the third switch K3t is connected in series with winding Z1n. The bridge arm midpoint of each second bridge arm switch of the above second bridge arm switches 302a to second bridge arm switches 302n can be connected to the second connection end of the above filter inductor L1a through a third switch and a phase winding connected in series, or the bridge arm midpoint of each second bridge arm switch is connected to the second connection end of the filter inductor L1a through a phase winding. For example, the midpoint of the bridge arm of the second bridge arm switch 302a is connected to the second connection end of the filter inductor L1a through the winding Z1a, the midpoint of the bridge arm of the second bridge arm switch 302b is connected to the second connection end of the filter inductor L1a through the third switch K3a connected in series with the winding Z1b, ..., the midpoint of the bridge arm of the second bridge arm switch 302n is connected to the second connection end of the filter inductor L1a through the third switch K3t connected in series with the winding Z1n.

[0052] In some feasible implementations, the control module 20 may also establish a wired connection or a wireless connection with the third switch K3a to the third switch K3t, which may be determined according to the actual application scenario and is not limited here. In the case of driving the motor 10 and charging the battery module at the same time, the control module 20 may control the second switch K2a and the third switch K3a to the third switch K3t to be turned on, control the first switch K1 and the second switch K2b to the second switch K2n to be turned off, and control the first bridge arm switch 301 and the second bridge arm switch 302a to the second bridge arm switch 302n to operate, thereby achieving the purpose of driving the motor 10 and charging the battery module at the same time. When the second switch K2a and the third switches K3a to K3t are turned on, and the first switch K1 and the second switch K2b to K2n are turned off, the filter inductor L1a (i.e., the first filter inductor) is respectively connected in series with each phase winding in the windings Z1a to Z1n to serve as the filter inductor of the AC / DC conversion module 30, and forms a power factor correction circuit with the AC / DC conversion module 30 to improve power utilization, thereby further improving energy conversion efficiency; in addition, the control module 20 can also adjust the speed of the motor 10 while driving the motor 10 and charging the battery module at the same time, thereby improving system flexibility and making it more applicable.

[0053] In some feasible implementations, when the motor 10 is driven alone, the input / output end of the AC / DC conversion module 30 can be used as the input end of the AC / DC conversion module 30 to connect the battery module. The control module 20 can also control the first switch K1 and the second switch K2a to the second switch K2n to be disconnected, control the third switch K3a to the third switch K3t to be turned on, and control each of the second bridge arm switches 302a to the second bridge arm switches 302n to operate, so that the AC / DC conversion module 30 performs a step-down conversion on the voltage provided by the battery module to obtain an AC voltage to drive the motor 10. At this time, the energy conversion system is in the motor single working mode. When the first switch K1 and the second switch K2a to the second switch K2n are disconnected and the third switch K3a to the third switch K3t are turned on, the current of the driving motor 10 will not flow through the filter inductor L1a to the filter inductor L1n, thereby avoiding energy loss and further improving the driving efficiency of the motor 10; in addition, the above-mentioned control module 20 can control the first switch K1, the second switch K2a to the second switch K2n, the third switch K3a to the third switch K3t and the above-mentioned second bridge arm switches to work in coordination to achieve the purpose of driving the motor 10 alone, which can improve the convenience of driving the motor 10 and make it more applicable.

[0054] In some feasible implementations, when charging the battery module alone, the input / output end of the AC / DC conversion module 30 can be used as the output end of the AC / DC conversion module 30. The control module 20 can also control the first switch K1 and the second switch K2a to the second switch K2n to be turned on, control the third switch K3a to the third switch K3t to be turned off, and control the first bridge arm switch 301 and each bridge arm switch in the second bridge arm switch 302a to the second bridge arm switch 302n to operate, so that the AC / DC conversion module 30 performs a step-up conversion on the voltage provided by the AC power source Vg to obtain a DC voltage to charge the battery module alone. At this time, the energy conversion system is in a battery charging mode alone. When the first switch K1 and the second switch K2a to the second switch K2n are turned on, and the third switch K3a to the third switch K3t are turned off, the filter inductor L1a to the filter inductor L1n can be used as the filter inductor of the AC / DC conversion module 30, and form a power factor correction circuit with the AC / DC conversion module 30 to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the multi-phase winding in the motor 10, so in the process of charging the battery module, there is no need to reuse the multi-phase winding in the motor 10 as the filter inductor of the AC / DC conversion module 30, that is, there is no need to customize and design the multi-phase winding in the motor 10, which further reduces the design complexity and system cost of the motor 10. In addition, the control module 20 can control the first switch K1, the second switch K2a to the second switch K2n, the third switch K3a to the third switch K3t and each bridge arm switch to work together to achieve the purpose of charging the battery module, thereby improving the convenience and charging efficiency of the battery charging, and having stronger applicability.

[0055] In some feasible implementations, the above Figure 3The motor 10 shown may include but is not limited to a three-phase motor and a six-phase motor. The specific type of the motor 10 may be determined according to the actual application scenario and is not limited here. For example, when the motor 10 is a three-phase motor, the multi-phase winding may be a three-phase winding; when the motor 10 is a six-phase motor, the multi-phase winding may be a six-phase winding. For the convenience of description, the motor 10 is taken as an example for description below, and no further details are given below. When the circuit topology of the energy conversion system is a three-phase PFC circuit (i.e., a three-phase interleaved parallel circuit), the number of filter inductors L1a to L1n and the number of second switches K2a to K2n are both 3; when the circuit topology of the energy conversion system is a two-phase PFC circuit (i.e., a two-phase interleaved parallel circuit), the number of filter inductors L1a to L1n and the number of second switches K2a to K2n are both 2; when the circuit topology of the energy conversion system is a single-phase PFC circuit, the number of filter inductors L1a to L1n and the number of second switches K2a to K2n are both 1.

[0056] Please also see Figure 4 , Figure 4 is another structural schematic diagram of the energy conversion system provided by the present application. In the case where the circuit topology of the energy conversion system is a three-phase PFC circuit, the energy conversion system includes three filter inductors (such as filter inductor L1a, filter inductor L1b and filter inductor L1n), and three second switches (such as second switch K2a, second switch K2b and second switch K2n). The specific circuit structure of the energy conversion system is as follows: Figure 4 As shown in FIG. 4a, the energy conversion system further includes a motor 10, a first switch K1, two third switches (such as a third switch K3a and a third switch K3t), a control module 20, and an AC / DC conversion module 30. The motor 10 includes three-phase windings (such as windings Z1a, Z1b, and Z1n), and the AC / DC conversion module 30 includes a first bridge arm switch 301, three second bridge arm switches (such as second bridge arm switch 302a, second bridge arm switch 302b, and second bridge arm switch 302n), wherein the first bridge arm switch 301, the second bridge arm switch 302a, the second bridge arm switch 302b, and the second bridge arm switch 302n can constitute a four-bridge arm AC / DC converter. Optionally, the above-mentioned AC / DC conversion module 30 also includes a bus capacitor C1 and a bidirectional DC / DC converter 303, and the input / output end of the bidirectional DC / DC converter 303 can be used as the input / output end of the AC / DC conversion module 30. The specific circuit topology of the AC / DC conversion module 30 can be determined according to the actual application scenario and is not limited here.

[0057] In some feasible embodiments, when the motor 10 is driven and the battery module is charged at the same time, the control module 20 can control the first switch K1, the second switch K2b and the second switch K2n to be disconnected, control the second switch K2a, the third switch K3a and the third switch K3t to be turned on (i.e. closed), and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 10, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C1 based on the voltage provided by the AC power supply Vg. Among them, the action of each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S11, the lower arm switch S22, the lower arm switch S24 and the lower arm switch S2q are turned on, and the lower arm switch S12, the upper arm switch S21, the upper arm switch S23 and the upper arm switch S2q-1 are turned off. Further, the control module 20 can control the bidirectional DC / DC converter 303 to charge the battery module based on the bus voltage, so as to achieve the purpose of driving the motor 10 and charging the battery module at the same time. In the process of driving the motor 10 and charging the battery module at the same time, the filter inductor L1a can be connected in series with each phase winding in the winding Z1a, the winding Z1b and the winding Z1n respectively as the filter inductor of the AC / DC conversion module 30, and form a power factor correction circuit with the AC / DC conversion module 30 to improve the power utilization rate. In addition, the control module 20 can obtain a differential mode voltage (also called a differential mode component) and a common mode voltage (also called a common mode component) based on the voltage provided by the AC power supply Vg, wherein the differential mode voltage can be used to control the speed of the motor 10, and the common mode voltage can be used to control the charging current of the battery module. That is to say, in the process of driving the motor 10 and charging the battery module at the same time, the speed of the motor 10 can be adjusted based on the differential mode voltage, and the charging current of the battery module can be adjusted based on the common mode voltage, thereby improving the flexibility of the system and making it more applicable.

[0058] In some feasible embodiments, when the motor 10 is driven alone, the control module 20 can control the bidirectional DC / DC converter 303 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 20 can control the first switch K1, the second switch K2a, the second switch K2b and the second switch K2n to be disconnected, control the third switch K3a and the third switch K3t to be turned on, and control the actions of the second bridge arm switches in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 12. In the process of driving the motor 10, the current of the driving motor 10 will not flow through the filter inductor L1a, the filter inductor L1b and the filter inductor L1n, thereby avoiding energy loss to improve the motor driving efficiency; in addition, the control module 20 can achieve the purpose of driving the motor 10 alone through switch control, thereby improving the convenience of driving the motor 10 and making it more applicable.

[0059] In some feasible embodiments, when charging the battery module alone, the control module 20 can control the first switch K1, the second switch K2a, the second switch K2b and the second switch K2n to be turned on, control the third switch K3a and the third switch K3t to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a voltage step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 303. Further, the control module 20 can control the bidirectional DC / DC converter 303 to charge the battery module based on the DC voltage. In the process of charging the battery module, the filter inductor L1a, the filter inductor L1b and the filter inductor L1n can be used as the filter inductor of the AC / DC conversion module 30, and form a three-phase PFC circuit with the AC / DC conversion module 30 to improve the power utilization rate, and realize the power factor correction function and the battery charging function, and the battery charging efficiency is higher and the applicability is stronger.

[0060] In some feasible implementations, when the circuit topology of the energy conversion system is a two-phase PFC circuit, the energy conversion system includes two filter inductors (such as filter inductor L1a and filter inductor L1b), and two second switches (such as second switch K2a and second switch K2b). The specific circuit structure of the energy conversion system is as follows: Figure 4As shown in FIG4b, the energy conversion system further includes a motor 10, a first switch K1, two third switches (such as a third switch K3a and a third switch K3t), a control module 20 and an AC / DC conversion module 30. The motor 10 includes three-phase windings (such as windings Z1a, Z1b and Z1n), and the AC / DC conversion module 30 includes a first bridge arm switch 301, three second bridge arm switches (such as second bridge arm switch 302a, second bridge arm switch 302b and second bridge arm switch 302n), a bus capacitor C1 and a bidirectional DC / DC converter 303, wherein the first bridge arm switch 301, the second bridge arm switch 302a, the second bridge arm switch 302b and the second bridge arm switch 302n can constitute a four-bridge arm AC / DC converter.

[0061] In some feasible embodiments, when the motor 10 is driven and the battery module is charged at the same time, the control module 20 can control the first switch K1 and the second switch K2b to be disconnected, control the second switch K2a, the third switch K3a and the third switch K3t to be turned on, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 10, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C1 based on the voltage provided by the AC power supply Vg. Among them, the action of each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S11, the lower arm switch S22, the lower arm switch S24 and the lower arm switch S2q are turned on, and the lower arm switch S12, the upper arm switch S21, the upper arm switch S23 and the upper arm switch S2q-1 are turned off. Furthermore, the control module 20 may control the bidirectional DC / DC converter 303 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 10 and charging the battery module at the same time.

[0062] In some feasible embodiments, when the motor 10 is driven alone, the control module 20 can control the bidirectional DC / DC converter 303 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 20 can control the first switch K1, the second switch K2a and the second switch K2b to be disconnected, control the third switch K3a and the third switch K3t to be turned on, and control the actions of the second bridge arm switches in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 10. In the process of driving the motor 10, the current of the driving motor 10 will not flow through the filter inductor L1a and the filter inductor L1b, thereby avoiding energy loss to improve the motor driving efficiency; in addition, the control module 20 can achieve the purpose of driving the motor 10 alone through switch control, thereby improving the convenience of driving the motor 10 and making it more applicable.

[0063] In some feasible embodiments, when charging the battery module alone, the control module 20 can control the first switch K1, the second switch K2a and the second switch K2b to be turned on, control the third switch K3a and the third switch K3t to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a voltage step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 303. Further, the control module 20 can control the bidirectional DC / DC converter 303 to charge the battery module based on the DC voltage. In the process of charging the battery module, the filter inductor L1a and the filter inductor L1b can be used as the filter inductor of the AC / DC conversion module 30, and form a two-phase PFC circuit with the AC / DC conversion module 30 to improve the power utilization rate, and realize the power factor correction function and the battery charging function, and the battery charging efficiency is higher and the applicability is stronger.

[0064] In the energy conversion system provided in the present application, the control module 20 can control the first switch K1, the second switch K2a to the second switch K2n, the third switch K3a to the third switch K3t, the first bridge arm switch 301 and the second bridge arm switch 302a to the second bridge arm switch 302n to work together, so as to drive the motor 10 and charge the battery module at the same time, or drive the motor 10 alone, or charge the battery module alone, thereby improving the flexibility of the entire energy conversion system and achieving higher energy conversion efficiency; in addition, since the energy conversion system can integrate the motor 10 and the on-board charger, the high-voltage network resonance point of the energy conversion system is reduced to improve the system stability, and at the same time reduce the number of high-voltage components used in the energy conversion system, thereby reducing the system cost, making the structure simpler and more applicable.

[0065] Optionally, in some possible implementations, see Figure 5 , Figure 5 is another schematic diagram of the structure of the energy conversion system provided by the present application. Figure 5As shown, the energy conversion system includes a motor 11, a control module 21, an AC / DC conversion module 31, a first switch K4, at least one filter inductor (such as filter inductors L2a to L2n) and at least one second switch (such as second switches K5a to K5n), wherein one of the filter inductors L2a to L2n is connected in series with one of the second switches K5a to K5n and then connected to the first connection end of the AC power source Vg. For example, the filter inductor L2a is connected in series with the second switch K5a and then connected to the first connection end of the AC power source Vg, the filter inductor L2b is connected in series with the second switch K5b and then connected to the first connection end of the AC power source Vg, ..., the filter inductor L2n is connected in series with the second switch K5n and then connected to the first connection end of the AC power source Vg. It can be seen that the filter inductors L2a to L2n correspond to the second switches K5a to K5n one by one; and the number of the filter inductors L2a to L2n is the same as the number of the second switches K5a to K5n.

[0066] In some feasible implementations, the AC / DC conversion module 31 includes but is not limited to a first bridge arm switch 311 and a plurality of second bridge arm switches (such as second bridge arm switches 312a to second bridge arm switches 312n) connected in parallel with the first bridge arm switch 311. The first bridge arm switch 311 includes an upper bridge arm switch S31 and a lower bridge arm switch S32 connected in series, and the bridge arm midpoint of the first bridge arm switch 311 refers to the series connection point of the upper bridge arm switch S31 and the lower bridge arm switch S32, and the upper bridge arm switch S31 and the lower bridge arm switch S32 are complementary conductive; the second bridge arm switch 312a includes an upper bridge arm switch S41 and a lower bridge arm switch S42 connected in series, and the bridge arm midpoint of the second bridge arm switch 312a refers to the series connection point of the upper bridge arm switch S41 and the lower bridge arm switch S42, and the upper bridge arm switch S41 and the lower bridge arm switch S42 are complementary conductive; the second bridge arm switch 312a includes an upper bridge arm switch S41 and a lower bridge arm switch S42 connected in series, and the bridge arm midpoint of the second bridge arm switch 312a refers to the series connection point of the upper bridge arm switch S41 and the lower bridge arm switch S42, and the upper bridge arm switch S41 and the lower bridge arm switch S42 are complementary conductive; The switch 312b includes an upper bridge arm switch S43 and a lower bridge arm switch S44 connected in series, and the midpoint of the bridge arm of the second bridge arm switch 312b refers to the series connection point of the upper bridge arm switch S43 and the lower bridge arm switch S44, and the upper bridge arm switch S43 and the lower bridge arm switch S44 are complementarily conductive; ..., the second bridge arm switch 312n includes an upper bridge arm switch S4q-1 and a lower bridge arm switch S4q connected in series, and the midpoint of the bridge arm of the second bridge arm switch 312n refers to the series connection point of the upper bridge arm switch S4q-1 and the lower bridge arm switch S4q, and the upper bridge arm switch S4q-1 and the lower bridge arm switch S4q are complementarily conductive.

[0067] In some feasible embodiments, when the motor 11 includes a multi-phase winding (such as windings Z2a to Z2n), the midpoint of the bridge arm of the first bridge arm switch 311 can be connected to the second connection end of the AC power source Vg; the midpoint of the bridge arm of each second bridge arm switch in the second bridge arm switch 312a to the second bridge arm switch 312n can be connected to the target second switch in the second switch K5a to the second switch K5n through a filter inductor and a phase winding in the windings Z2a to Z2n, and a first switch K4 is provided between the target second switch and the filter inductor connected in series therewith. The target second switch here refers to any second switch in the second switch K5a to the second switch K5n, such as the above Figure 5 As shown, the target second switch can be the second switch K5a. At this time, the bridge arm midpoint of the second bridge arm switch 312a can be connected to the second switch K5a through the filter inductor L2a and the winding Z2a, and the winding Z2a is connected in parallel with the first switch K4; the bridge arm midpoint of the second bridge arm switch 312b can be connected to the second switch K5a through the filter inductor L2b and the winding Z2b; ..., the bridge arm midpoint of the second bridge arm switch 312n can be connected to the second switch K5a through the filter inductor L2n and the winding Z2n. It can be seen that the above-mentioned second bridge arm switches 312a to the second bridge arm switches 312n correspond one-to-one with the windings Z2a to the windings Z2n; and the number of the second bridge arm switches 312a to the second bridge arm switches 312n is the same as the number of the windings Z2a to the windings Z2n. The input / output end of the AC / DC conversion module 31 can be connected to a battery module, wherein the input / output end of the AC / DC conversion module 31 can be understood as the parallel connection end of the first bridge arm switch 311 and the second bridge arm switch 312a to the second bridge arm switch 312n.

[0068] In some feasible embodiments, the control module 21 may include but is not limited to a control board, a control chip or a controller; the control module 21 may establish a wired connection or a wireless connection with the first switch K4, the second switch K5a to the second switch K5n, the first bridge arm switch 311, and the second bridge arm switch 312a to the second bridge arm switch 312n, which may be determined according to the actual application scenario and is not limited here. In the case of driving the motor 11 and charging the battery module at the same time, the input / output end of the AC / DC conversion module 31 may be used as the output end of the AC / DC conversion module 31. The control module 21 may control the first switch K4 to be disconnected, control each of the second switches K5a to the second switch K5n to be turned on or off, and control the first bridge arm switch 311 and each of the bridge arm switches 312a to the second bridge arm switch 312n to act, thereby achieving the purpose of driving the motor 11 and charging the battery module based on the voltage provided by the AC power supply Vg. Among them, the turning on or off of each second switch in the second switch K5a to the second switch K5n can be understood as: each second switch in the second switch K5a to the second switch K5n can be turned on or off, that is, each second switch has two working states (i.e., the on state or the off state), and it should be noted that the working states of different second switches in the second switch K5a to the second switch K5n can be the same or different. In the case of driving the motor 11 and charging the battery module at the same time, a part of the second switches in the second switch K5a to the second switch K5n are turned on (i.e., a part of the second switches are in the on state), and another part of the second switches in the second switch K5a to the second switch K5n are turned off (i.e., another part of the second switches are in the off state).

[0069] In some feasible implementations, when a portion of the second switches K5a to K5n are turned on, the first switch K4 and another portion of the second switches K5a to K5n are turned off, and the second bridge arm switches 312a to 312n cooperate to obtain a differential mode voltage based on the voltage provided by the AC power source Vg to drive the motor 11. The coordinated action of the second bridge arm switches can be understood as: the upper bridge arm switches in the second bridge arm switches are turned off, and the lower bridge arm switches in the second bridge arm switches are turned on, for example, the upper bridge arm switches S41, the upper bridge arm switches S43, ..., and the upper bridge arm switch S4q-1 are turned off, and the lower bridge arm switches S42, the lower bridge arm switches S44, ..., and the lower bridge arm switch S4q are turned on. When a part of the second switches among the second switches K5a to the second switches K5n are turned on, the other part of the second switches among the first switch K4 and the second switches K5a to the second switches K5n are turned off, and the first bridge arm switch 311 and the bridge arm switches among the second bridge arm switches 312a to the second bridge arm switches 312n cooperate to achieve the purpose of obtaining a common mode voltage based on the voltage provided by the AC power supply Vg to charge the battery module. Among them, the coordinated action of each bridge arm switch can be understood as: the upper bridge arm switch S31 of the first bridge arm switch 311 is turned on, the lower bridge arm switch S32 is turned off, the upper bridge arm switch of each second bridge arm switch among the second bridge arm switches 312a to the second bridge arm switch 312n is turned off, and the lower bridge arm switch of each second bridge arm switch is turned on, for example, the upper bridge arm switch S41, the upper bridge arm switch S43, ..., and the upper bridge arm switch S4q-1 are turned off, and the lower bridge arm switch S42, the lower bridge arm switch S44, ..., and the lower bridge arm switch S4q are turned on.

[0070] It can be seen that the above-mentioned control module 21 can control the first switch K4, the second switch K5a to the second switch K5n, and the first bridge arm switch 311 and the second bridge arm switch 312a to the second bridge arm switch 312n to work in coordination, thereby achieving the purpose of obtaining a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 11, and also achieving the purpose of obtaining a common mode voltage based on the voltage provided by the AC power supply Vg to charge the battery module, that is, achieving the purpose of driving the motor 11 and charging the battery module at the same time, thereby improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, thereby reducing the system cost, and the structure is simpler and has strong applicability.

[0071] In some feasible embodiments, for the entire energy conversion system, the energy conversion system can integrate the motor 11, the filter inductor L2a to the filter inductor L2n and the AC / DC conversion module 31, wherein the filter inductor L2a to the filter inductor L2n and the AC / DC conversion module 31 can constitute the on-board charger in the above-mentioned electric vehicle, that is, the energy conversion system can integrate the motor 11 and the on-board charger, and there is no need to use a high-voltage distribution box to integrate the motor 11 and the on-board charger, thereby greatly reducing the number of high-voltage components used in the energy conversion system and making the structure simpler; secondly, the energy conversion system uses a control module 21 to realize the simultaneous operation of the motor 11 and the on-board charger (which can charge the battery module), thereby greatly reducing the controller cost and having strong applicability. In addition, the energy conversion system can reuse the first bridge arm switch 311 and each bridge arm switch from the second bridge arm switch 312a to the second bridge arm switch 312n to achieve the purpose of simultaneous operation of the motor 11 and the on-board charger. That is to say, the high-voltage output part of the on-board charger and the high-voltage input part of the motor 11 share the signal circuit (that is, the circuit composed of each bridge arm switch), thereby reducing the high-voltage network resonance point of the energy conversion system, further improving the system stability, and making it more applicable.

[0072] In some feasible embodiments, the second switches K5a to K5n include the second switch K5a (i.e., the target second switch) and other second switches (e.g., the second switches K5b to K5n), wherein the filter inductor L2a can be connected in series with the second switch K5a through the first switch K4, and each of the filter inductors L2b to L2n is connected in series with one of the second switches K5b to K5n. In the case of driving the motor 11 and charging the battery module at the same time, the control module 21 can control the second switch K5a (i.e., a part of the second switches in the second switches K5a to K5n) to be turned on, control the first switch K4 and the second switches K5b to K5n (i.e., another part of the second switches in the second switches K5a to K5n) to be turned off, and control the first bridge arm switch 311 and each bridge arm switch in the second bridge arm switch 312a to 312n to act, thereby achieving the purpose of driving the motor 11 and charging the battery module at the same time. When the second switch K5a is turned on and the first switch K4 and the second switch K5b to the second switch K5n are turned off, each phase winding in the windings Z2a to Z2n can be connected in series with each filter inductor in the filter inductor L2a to L2n to serve as the filter inductor of the AC / DC conversion module 31, and form a power factor correction circuit with the AC / DC conversion module 31 to improve power utilization, thereby further improving energy conversion efficiency; in addition, when the control module 21 drives the motor 11 and charges the battery module at the same time, the speed of the motor 11 can also be adjusted, thereby improving system flexibility and making it more applicable.

[0073] In some feasible embodiments, the energy conversion system may further include at least two third switches, and each of the at least two third switches is connected in series with a phase winding among the windings Z2a to Z2n. It can be understood that the number of at least two third switches is the same as the number of windings Z2a to Z2n and corresponds one to one; or, the number of at least two third switches is the difference between the number of windings Z2a to Z2n and 1, that is, one of the phase windings among windings Z2a to Z2n may not be connected in series with the third switch, and the one-phase winding may be the winding Z2a connected to the second bridge arm switch 312a (i.e., the bridge arm switch coupled to the first switch K4). In the case where the number of at least two third switches is the difference between the number of windings Z2a to Z2n and 1, please refer to Figure 6 , Figure 6 is another schematic diagram of the structure of the energy conversion system provided by the present application. Figure 6 As shown above Figure 5The energy conversion system shown also includes at least two third switches (such as third switches K6a to third switches K6t), each of the third switches K6a to third switches K6t is connected in series with one phase winding of windings Z2a to Z2n, or one phase winding of windings Z2a to Z2n is not connected in series with the third switch. For example, winding Z2a is not connected in series with the third switch, the third switch K6a is connected in series with winding Z2b, ..., the third switch K6t is connected in series with winding Z2n. Each of the filter inductors L2a to L2n is connected to the second switch K5a through a third switch and a phase winding connected in series, or each filter inductor is connected to the second switch K5a through a phase winding. For example, the filter inductor L2a is connected to the second switch K5a through the winding Z2a, the filter inductor L2b is connected to the second switch K5a through the third switch K6a and the winding Z2b connected in series, ..., the filter inductor L2n is connected to the second switch K5a through the third switch K6t and the winding Z2n connected in series.

[0074] In some feasible implementations, the control module 21 may also establish a wired connection or a wireless connection with the third switch K6a to the third switch K6t, which may be determined according to the actual application scenario and is not limited here. In the case of driving the motor 11 and charging the battery module at the same time, the control module 21 may control the second switch K5a and the third switch K6a to the third switch K6t to be turned on, control the first switch K4 and the second switch K5b to the second switch K5n to be turned off, and control the first bridge arm switch 311 and the second bridge arm switch 312a to the second bridge arm switch 312n to operate, thereby achieving the purpose of driving the motor 11 and charging the battery module at the same time. When the second switch K5a and the third switches K6a to K6t are turned on, and the first switch K4 and the second switch K5b to K5n are turned off, each phase winding in windings Z2a to Z2n can be connected in series with each filter inductor in filter inductor L2a to L2n to serve as the filter inductor of the AC / DC conversion module 31, and form a power factor correction circuit with the AC / DC conversion module 31 to improve power utilization, thereby further improving energy conversion efficiency; in addition, the above-mentioned control module 21 can also adjust the speed of the motor 11 while driving the motor 11 and charging the battery module at the same time, thereby improving system flexibility and enhancing applicability.

[0075] In some feasible implementations, when the motor 11 is driven alone, the input / output end of the AC / DC conversion module 31 can be used as the input end of the AC / DC conversion module 31 to connect the battery module. The control module 21 can also control the first switch K4 and the second switch K5a to the second switch K5n to be disconnected, control the third switch K6a to the third switch K6t to be turned on, and control the second bridge arm switches 312a to the second bridge arm switches 312n to operate, so that the AC / DC conversion module 31 performs a step-down conversion on the voltage provided by the battery module to obtain an AC voltage to drive the motor 10. At this time, the energy conversion system is in the motor single working mode. In the process of driving the motor 11, when the first switch K4 and the second switch K5a to the second switch K5n are disconnected and the third switch K6a to the third switch K6t are turned on, the filter inductor L2a to the filter inductor L2n can be used as the filter inductor of the AC / DC conversion module 31, and constitute a power factor correction circuit with the AC / DC conversion module 31 to improve the power utilization rate, and realize the power factor correction function and the motor driving function, thereby improving the driving efficiency of the motor 11; in addition, the above-mentioned control module 21 can control the first switch K4, the second switch K5a to the second switch K5n, the third switch K6a to the third switch K6t and each second bridge arm switch to work together to achieve the purpose of driving the motor 11 alone, which can improve the convenience of driving the motor 11 and make it more applicable.

[0076] In some feasible implementations, when charging the battery module alone, the input / output end of the AC / DC conversion module 31 can be used as the output end of the AC / DC conversion module 31. The control module 21 can also control the first switch K4 and the second switch K5a to the second switch K5n to be turned on, control the third switch K6a to the third switch K6t to be turned off, and control the first bridge arm switch 311 and each bridge arm switch in the second bridge arm switch 312a to the second bridge arm switch 312n to operate, so that the AC / DC conversion module 31 performs a step-up conversion on the voltage provided by the AC power source Vg to obtain a DC voltage to charge the battery module alone. At this time, the energy conversion system is in a battery charging mode alone. When the first switch K4 and the second switch K5a to the second switch K5n are turned on, and the third switch K6a to the third switch K6t are turned off, the filter inductor L2a to the filter inductor L2n can be used as the filter inductor of the AC / DC conversion module 31, and form a power factor correction circuit with the AC / DC conversion module 31 to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the multi-phase winding in the motor 11, so in the process of charging the battery module, there is no need to reuse the multi-phase winding in the motor 11 as the filter inductor of the AC / DC conversion module 31, that is, there is no need to customize and design the multi-phase winding in the motor 11, which further reduces the design complexity and system cost of the motor 11. In addition, the control module 21 can control the first switch K4, the second switch K5a to the second switch K5n, the third switch K6a to the third switch K6t and each bridge arm switch to work together to achieve the purpose of charging the battery module, thereby improving the convenience and charging efficiency of the battery charging, and having stronger applicability.

[0077] In some feasible implementations, the above Figure 6The motor 11 shown may include but is not limited to a three-phase motor and a six-phase motor. The specific type of the motor 11 may be determined according to the actual application scenario and is not limited here. For example, when the motor 11 is a three-phase motor, the multi-phase winding may be a three-phase winding; when the motor 11 is a six-phase motor, the multi-phase winding may be a six-phase winding. For the convenience of description, the motor 11 is a three-phase motor as an example, and no further description is given below. When the circuit topology of the energy conversion system is a three-phase PFC circuit (i.e., a three-phase interleaved parallel circuit), the number of the above-mentioned filter inductors L2a to L2n and the number of second switches K5a to K5n are both 3; when the circuit topology of the energy conversion system is a two-phase PFC circuit (i.e., a two-phase interleaved parallel circuit), the number of the above-mentioned filter inductors L2a to L2n and the number of second switches K5a to K5n are both 2; when the circuit topology of the energy conversion system is a single-phase PFC circuit, the number of filter inductors L2a to L2n and the number of second switches K5a to K5n are both 1.

[0078] Please also see Figure 7 , Figure 7 is another structural schematic diagram of the energy conversion system provided by the present application. In the case where the circuit topology of the energy conversion system is a three-phase PFC circuit, the energy conversion system includes three filter inductors (such as filter inductor L2a, filter inductor L2b and filter inductor L2n), and three second switches (such as second switch K5a, second switch K5b and second switch K5n). The specific circuit structure of the energy conversion system is as follows: Figure 7 As shown, the energy conversion system further includes a motor 11, a first switch K4, two third switches (such as a third switch K6a and a third switch K6t), a control module 21, and an AC / DC conversion module 31. The motor 11 includes three-phase windings (such as winding Z2a, winding Z2b, and winding Z2n), and the AC / DC conversion module 31 includes a first bridge arm switch 311, three second bridge arm switches (such as a second bridge arm switch 312a, a second bridge arm switch 312b, and a second bridge arm switch 312n), wherein the first bridge arm switch 311, the second bridge arm switch 312a, the second bridge arm switch 312b, and the second bridge arm switch 312n can constitute a four-bridge arm AC / DC converter. Optionally, the AC / DC conversion module 31 also includes a bus capacitor C2 and a bidirectional DC / DC converter 313, and the input / output end of the bidirectional DC / DC converter 313 can be used as the input / output end of the AC / DC conversion module 31. The specific circuit topology of the AC / DC conversion module 31 can be determined according to the actual application scenario and is not limited here.

[0079] In some feasible embodiments, when the motor 11 is driven and the battery module is charged at the same time, the control module 21 can control the first switch K4, the second switch K5b and the second switch K5n to be disconnected, control the second switch K5a, the third switch K6a and the third switch K6t to be turned on, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 11, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C2 based on the voltage provided by the AC power supply Vg. Among them, each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S31, the lower arm switch S42, the lower arm switch S44 and the lower arm switch S4q are turned on, and the lower arm switch S32, the upper arm switch S41, the upper arm switch S43 and the upper arm switch S4q-1 are disconnected. Furthermore, the control module 21 can control the bidirectional DC / DC converter 313 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 11 and charging the battery module at the same time. In the process of driving the motor 11 and charging the battery module at the same time, each phase winding in the winding Z2a, winding Z2b and winding Z2n can be connected in series with each filter inductor in the filter inductor L2a, filter inductor L2b and filter inductor L2n respectively as the filter inductor of the AC / DC conversion module 31, and form a power factor correction circuit with the AC / DC conversion module 31 to improve the power utilization rate; in addition, the control module 21 can obtain a differential mode voltage (also called a differential mode component) and a common mode voltage (also called a common mode component) based on the voltage provided by the AC power supply Vg, wherein the differential mode voltage can be used to control the speed of the motor 11, and the common mode voltage can be used to control the charging current of the battery module. That is to say, in the process of driving the motor 11 and charging the battery module at the same time, the speed of the motor 11 can be adjusted based on the differential mode voltage, and the charging current of the battery module can be adjusted based on the common mode voltage, thereby improving the flexibility of the system and making it more applicable.

[0080] In some feasible embodiments, when the motor 11 is driven alone, the control module 21 can control the bidirectional DC / DC converter 313 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 21 can control the first switch K4, the second switch K5a, the second switch K5b and the second switch K5n to be disconnected, control the third switch K6a and the third switch K6t to be turned on, and control the actions of the second bridge arm switches in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 11. In the process of driving the motor 11, the filter inductor L2a, the filter inductor L2b and the filter inductor L2n can be used as the filter inductor of the AC / DC conversion module 31, and form a power factor correction circuit with the AC / DC conversion module 31 to improve the power utilization rate, thereby improving the driving efficiency of the motor 11; in addition, the control module 21 can achieve the purpose of driving the motor 11 alone through switch control, thereby improving the convenience of driving the motor 11 and having stronger applicability.

[0081] In some feasible embodiments, when charging the battery module alone, the control module 21 can control the first switch K4, the second switch K5a, the second switch K5b and the second switch K5n to be turned on, control the third switch K6a and the third switch K6t to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a voltage step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 313. Further, the control module 21 can control the bidirectional DC / DC converter 313 to charge the battery module based on the DC voltage. In the process of charging the battery module, the filter inductor L2a, the filter inductor L2b and the filter inductor L2n can be used as the filter inductor of the AC / DC conversion module 31, and form a power factor correction circuit with the AC / DC conversion module 31 to improve the power utilization rate, and realize the power factor correction function and the battery charging function, and the battery charging efficiency is higher and the applicability is stronger.

[0082] In the energy conversion system provided in the present application, the control module 21 can control the first switch K4, the second switch K5a to the second switch K5n, the third switch K6a to the third switch K6t, the first bridge arm switch 311 and the second bridge arm switch 312a to the second bridge arm switch 312n to work together, so as to drive the motor 11 and charge the battery module at the same time, or drive the motor 11 alone, or charge the battery module alone, thereby improving the flexibility of the entire energy conversion system and achieving higher energy conversion efficiency; in addition, since the energy conversion system can integrate the motor 11 and the on-board charger, the high-voltage network resonance point of the energy conversion system is reduced to improve the system stability, and at the same time reduce the number of high-voltage components used in the energy conversion system, thereby reducing the system cost, making the structure simpler and more applicable.

[0083] Optionally, in some possible implementations, see Figure 8 , Figure 8 is another schematic diagram of the structure of the energy conversion system provided by the present application. Figure 8 As shown, the energy conversion system includes a motor 12, a control module 22, an AC / DC conversion module 32, a first switch K7, at least one filter inductor (such as filter inductors L3a to L3n) and at least one second switch (such as second switches K8a to K8n), and the first connection end of one of the filter inductors L3a to L3n can be connected to the first connection end of the AC power source Vg through one of the second switches K8a to K8n. For example, the first connection end of the filter inductor L3a can be connected to the first connection end of the AC power source Vg through the second switch K8a, the first connection end of the filter inductor L3b can be connected to the first connection end of the AC power source Vg through the second switch K8b, ..., the first connection end of the filter inductor L3n can be connected to the first connection end of the AC power source Vg through the second switch K8n. It can be seen that the above-mentioned filter inductors L3a to L3n correspond to the second switches K8a to K8n one by one; and the number of the filter inductors L3a to L3n is the same as the number of the second switches K8a to K8n.

[0084] In some feasible implementations, as described above Figure 8As shown, the AC / DC conversion module 32 includes but is not limited to a first bridge arm switch 321 and a plurality of second bridge arm switches (such as second bridge arm switches 322a to second bridge arm switches 322n) connected in parallel with the first bridge arm switch 321. In other words, the first bridge arm switch 321 and the second bridge arm switches 322a to second bridge arm switches 322n are connected in parallel. Among them, the first bridge arm switch 321 includes an upper bridge arm switch S51 and a lower bridge arm switch S52 connected in series, the bridge arm midpoint of the first bridge arm switch 321 refers to the series connection point of the upper bridge arm switch S51 and the lower bridge arm switch S52, and the upper bridge arm switch S51 and the lower bridge arm switch S52 are complementary and conductive; the second bridge arm switch 322a includes an upper bridge arm switch S61 and a lower bridge arm switch S62 connected in series, the bridge arm midpoint of the second bridge arm switch 322a refers to the series connection point of the upper bridge arm switch S61 and the lower bridge arm switch S62, and the upper bridge arm switch S61 and the lower bridge arm switch S62 are complementary and conductive; the second bridge arm switch 322a includes an upper bridge arm switch S61 and a lower bridge arm switch S62 connected in series, the bridge arm midpoint of the second bridge arm switch 322a refers to the series connection point of the upper bridge arm switch S61 and the lower bridge arm switch S62, and the upper bridge arm switch S61 and the lower bridge arm switch S62 are complementary and conductive; The switch 322b includes an upper bridge arm switch S63 and a lower bridge arm switch S64 connected in series, and the midpoint of the bridge arm of the second bridge arm switch 322b refers to the series connection point of the upper bridge arm switch S63 and the lower bridge arm switch S64, and the upper bridge arm switch S63 and the lower bridge arm switch S64 are complementarily conductive; ..., the second bridge arm switch 322n includes an upper bridge arm switch S6q-1 and a lower bridge arm switch S6q connected in series, and the midpoint of the bridge arm of the second bridge arm switch 322n refers to the series connection point of the upper bridge arm switch S6q-1 and the lower bridge arm switch S6q, and the upper bridge arm switch S6q-1 and the lower bridge arm switch S6q are complementarily conductive.

[0085] In some feasible embodiments, the arm midpoint of the first bridge arm switch 321 can be connected to the second connection end of the AC power source Vg, and the arm midpoint of each of the second bridge arm switches 322a to 322n is connected to the second connection end of a filter inductor. For example, the arm midpoint of the second bridge arm switch 322a is connected to the second connection end of the filter inductor L3a, the arm midpoint of the second bridge arm switch 322b is connected to the second connection end of the filter inductor L3b, ..., the arm midpoint of the second bridge arm switch 322n is connected to the second connection end of the filter inductor L3n. In the case where the motor 12 includes a multi-phase winding (such as windings Z3a to Z3n), the arm midpoints of the second bridge arm switches 322a to 322n can be connected to the first connection end of the first switch K7 through the windings Z3a to Z3n, and the second connection end of the first switch K7 is connected to the first connection end of the AC power source Vg. For example, the bridge arm midpoint of the second bridge arm switch 322a can be connected to the first connection end of the first switch K7 through the winding Z3a, the bridge arm midpoint of the second bridge arm switch 322b can be connected to the first connection end of the first switch K7 through the winding Z3b, ..., the bridge arm midpoint of the second bridge arm switch 322n can be connected to the first connection end of the first switch K7 through the winding Z3n. It can be seen that the second bridge arm switch 322a to the second bridge arm switch 322n correspond to the windings Z3a to Z3n one by one; and the number of the second bridge arm switches 322a to the second bridge arm switches 322n is the same as the number of the windings Z3a to Z3n. The input / output end of the above-mentioned AC / DC conversion module 32 can be connected to the battery module, wherein the input / output end of the AC / DC conversion module 32 can be understood as the parallel connection end of the first bridge arm switch 321 and the second bridge arm switch 322a to the second bridge arm switch 322n.

[0086] In some feasible embodiments, the control module 22 may include but is not limited to a control board, a control chip or a controller; the control module 22 may establish a wired connection or a wireless connection with the first switch K7, the second switch K8a to the second switch K8n, the first bridge arm switch 321, and the second bridge arm switch 322a to the second bridge arm switch 322n, which may be determined according to the actual application scenario and is not limited here. In the case of driving the motor 12 and charging the battery module at the same time, the input / output end of the AC / DC conversion module 32 may be used as the output end of the AC / DC conversion module 32. The control module 22 may control the first switch K7 to be turned on, control the second switch K8a to the second switch K8n to be turned off, and control the first bridge arm switch 321 and the second bridge arm switch 322a to the second bridge arm switch 322n to act, thereby achieving the purpose of driving the motor 12 and charging the battery module based on the voltage provided by the AC power supply Vg.

[0087] In some feasible implementations, when the first switch K7 is turned on, the second switches K8a to K8n are turned off, and each of the second bridge arm switches 322a to 322n cooperates, the purpose of obtaining a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12 can be achieved. The coordinated action of each second bridge arm switch can be understood as: the upper bridge arm switch in each second bridge arm switch is turned off, and the lower bridge arm switch in each second bridge arm switch is turned on, for example, the upper bridge arm switch S61, the upper bridge arm switch S63, ..., and the upper bridge arm switch S6q-1 are turned off, and the lower bridge arm switch S62, the lower bridge arm switch S64, ..., and the lower bridge arm switch S6q are turned on. When the first switch K7 is turned on, the second switches K8a to K8n are turned off, and the first bridge arm switch 321 and the bridge arm switches 322a to 322n cooperate to achieve the purpose of obtaining a common mode voltage based on the voltage provided by the AC power supply Vg to charge the battery module. The coordinated action of each bridge arm switch can be understood as: the upper bridge arm switch S51 of the first bridge arm switch 321 is turned on, the lower bridge arm switch S52 is turned off, the upper bridge arm switch of each second bridge arm switch in the second bridge arm switch 322a to 322n is turned off, and the lower bridge arm switch of each second bridge arm switch is turned on, for example, the upper bridge arm switch S61, the upper bridge arm switch S63, ..., and the upper bridge arm switch S6q-1 are turned off, and the lower bridge arm switch S62, the lower bridge arm switch S64, ..., and the lower bridge arm switch S6q are turned on.

[0088] It can be seen that the above-mentioned control module 22 can control the first switch K7, the second switch K8a to the second switch K8n, and the first bridge arm switch 321 and the second bridge arm switch 322a to the second bridge arm switch 322n to work in coordination, thereby achieving the purpose of obtaining a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12, and also achieving the purpose of obtaining a common mode voltage based on the voltage provided by the AC power supply Vg to charge the battery module, that is, achieving the purpose of simultaneously driving the motor 12 and charging the battery module, thereby improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, thereby reducing the system cost, and the structure is simpler and has strong applicability.

[0089] In some feasible embodiments, for the entire energy conversion system, the energy conversion system can integrate the motor 12, the filter inductor L3a to the filter inductor L3n and the AC / DC conversion module 32, wherein the filter inductor L3a to the filter inductor L3n and the AC / DC conversion module 32 can constitute the on-board charger in the above-mentioned electric vehicle, that is, the energy conversion system can integrate the motor 12 and the on-board charger, and there is no need to use a high-voltage distribution box to integrate the motor 12 and the on-board charger, thereby greatly reducing the number of high-voltage components used in the energy conversion system and making the structure simpler; secondly, the energy conversion system uses a control module 22 to realize the simultaneous operation of the motor 12 and the on-board charger (which can charge the battery module), thereby greatly reducing the controller cost and having strong applicability. In addition, the energy conversion system can reuse the first bridge arm switch 321 and each bridge arm switch from the second bridge arm switch 322a to the second bridge arm switch 322n to achieve the purpose of simultaneous operation of the motor 12 and the on-board charger, that is, the high-voltage output part of the on-board charger and the high-voltage input part of the motor 12 share the signal circuit (that is, the circuit composed of each bridge arm switch), thereby reducing the high-voltage network resonance point of the energy conversion system, further improving the system stability, and making it more applicable. Please also refer to Fig. 9 , Fig. 9 It is another structural schematic diagram of the energy conversion system provided by this application.

[0090] In some possible implementations, such as Fig. 9 As shown above Figure 8 The energy conversion system shown also includes at least one third switch (such as third switches K9a to K9t), each of which is connected in series with one phase winding of the windings Z3a to Z3n. For example, the third switch K9a is connected in series with the winding Z3a, the third switch K9b is connected in series with the winding Z3b, ..., the third switch K9n is connected in series with the winding Z3n. The midpoint of the bridge arm of each of the second bridge arm switches 322a to 322n can be connected to the first connection end of the first switch K7 through a third switch and a phase winding connected in series. For example, the midpoint of the second bridge arm switch 322a can be connected to the first connection end of the first switch K7 through the third switch K9a and winding Z3a connected in series, the midpoint of the second bridge arm switch 322b can be connected to the first connection end of the first switch K7 through the third switch K9b and winding Z3b connected in series, and..., the midpoint of the second bridge arm switch 322n can be connected to the first connection end of the first switch K7 through the third switch K9n and winding Z3n connected in series.

[0091] It can be understood that the number of the third switches K9a to K9t is the same as that of the windings Z3a to Z3n and corresponds to each other; or, the number of the third switches K9a to K9t is the difference between the number of windings Z3a to Z3n and 1, that is, any one phase winding in the windings Z3a to Z3n may not be connected in series with the third switch; or, the number of the third switches K9a to K9t is the difference between the number of windings Z3a to Z3n and 2, that is, any two phase windings in the windings Z3a to Z3n may not be connected in series with the third switch; or, each phase winding in the windings Z3a to Z3n does not have a third switch connected in series, that is, the energy conversion system may not include the third switches K9a to K9t. It should be noted that the specific number of the third switches K9a to K9t can be determined according to the actual application scenario and is not limited here.

[0092] In some feasible implementations, the control module 22 may also establish a wired connection or a wireless connection with the third switch K9a to the third switch K9t, which may be determined according to the actual application scenario and is not limited here. When the motor 12 is driven and the battery module is charged at the same time, the control module 22 may control the first switch K7 and the third switch K9a to the third switch K9t to be turned on, control the second switch K8a to the second switch K8n to be turned off, and control the first bridge arm switch 321 and the second bridge arm switch 322a to the second bridge arm switch 322n to act, thereby achieving the purpose of driving the motor 12 based on the voltage provided by the AC power supply Vg and charging the battery module. When the first switch K7 and the third switch K9a to the third switch K9t are turned on and the second switch K8a to the second switch K8n are turned off, the windings Z3a to Z3n in the motor 12 can be used as filter inductors of the AC / DC conversion module 32, and form a power factor correction circuit with the AC / DC conversion module 32 to improve power utilization, thereby further improving energy conversion efficiency; in addition, the above-mentioned control module 22 can also adjust the speed of the motor 12 while driving the motor 12 and charging the battery module at the same time, thereby improving system flexibility and making it more applicable.

[0093] In some feasible implementations, when the motor 12 is driven alone, the input / output end of the AC / DC conversion module 32 can be used as the input end of the AC / DC conversion module 32. The control module 22 can also control the first switch K7 and the second switches K8a to K8n to be disconnected, control the third switches K9a to K9t to be turned on, and control the second bridge arm switches 322a to 322n to operate, so that the AC / DC conversion module 32 performs a step-down conversion on the voltage provided by the battery module to obtain an AC voltage to drive the motor 12. At this time, the energy conversion system is in the motor single working mode. When the first switch K7 and the third switch K9a to the third switch K9t are turned on and the second switch K8a to the second switch K8n are turned off, the current of the driving motor 12 will not flow through the filter inductor L3a to the filter inductor L3n, thereby avoiding energy loss and further improving the driving efficiency of the motor 12; in addition, the above-mentioned control module 22 can control the first switch K7, the second switch K8a to the second switch K8n, the third switch K9a to the third switch K9t and each second bridge arm switch to work in coordination to achieve the purpose of driving the motor 12 alone, which can improve the convenience of driving the motor 12 and make it more applicable.

[0094] In some feasible implementations, when charging the battery module alone, the input / output end of the AC / DC conversion module 32 can be used as the output end of the AC / DC conversion module 32. The control module 22 can also control the first switch K7 and the third switch K9a to the third switch K9t to be disconnected, control the second switch K8a to the second switch K8n to be turned on, and control the first bridge arm switch 321 and the second bridge arm switch 322a to the second bridge arm switch 322n to operate, so that the AC / DC conversion module 32 performs a step-up conversion on the voltage provided by the AC power source Vg to obtain a DC voltage to charge the battery module alone. At this time, the energy conversion system is in a battery charging mode. When the first switch K7 and the third switch K9a to the third switch K9t are disconnected, and the second switch K8a to the second switch K8n are turned on, the filter inductor L3a to the filter inductor L3n can be used as the filter inductor of the AC / DC conversion module 32, and constitute a power factor correction circuit with the AC / DC conversion module 32 to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the windings Z3a to the winding Z3n in the motor 12. Therefore, in the process of charging the battery module, there is no need to reuse the windings Z3a to the winding Z3n in the motor 12 as the filter inductor of the AC / DC conversion module 32, that is, there is no need to customize and design the windings Z3a to the winding Z3n in the motor 12, which further reduces the design complexity and system cost of the motor 12. In addition, the control module 22 can control the first switch K7, the second switch K8a to the second switch K8n, the third switch K9a to the third switch K9t and each bridge arm switch to work together to achieve the purpose of charging the battery module, thereby improving the convenience and efficiency of battery charging and having stronger applicability.

[0095] In some feasible implementations, the above Fig. 9The motor 12 shown may include but is not limited to a three-phase motor and a six-phase motor. The specific type of the motor 12 may be determined according to the actual application scenario and is not limited here. For example, in the case where the motor 12 is a three-phase motor, the multi-phase winding may be a three-phase winding, and the number of the third switch K9a to the third switch K9t is greater than or equal to 0 and less than or equal to 3; in the case where the motor 12 is a six-phase motor, the multi-phase winding may be a six-phase winding, and the number of the third switch K9a to the third switch K9t is greater than or equal to 0 and less than or equal to 6. For the convenience of description, the following will be described by taking the motor 12 as a three-phase motor as an example, and will not be repeated below. When the circuit topology of the energy conversion system is a three-phase PFC circuit (i.e., a three-phase interleaved parallel circuit), the number of filter inductors L3a to L3n and the number of second switches K8a to K8n are both 3; when the circuit topology of the energy conversion system is a two-phase PFC circuit (i.e., a two-phase interleaved parallel circuit), the number of filter inductors L3a to L3n and the number of second switches K8a to K8n are both 2; when the circuit topology of the energy conversion system is a single-phase PFC circuit, the number of filter inductors L3a to L3n and the number of second switches K8a to K8n are both 1.

[0096] In some feasible implementations, when the circuit topology of the energy conversion system is a three-phase PFC circuit, the energy conversion system includes three filter inductors (such as filter inductor L3a, filter inductor L3b and filter inductor L3n) and three second switches (such as second switch K8a, second switch K8b and second switch K8n). For the specific circuit structure of the energy conversion system, please refer to Fig.10 , Fig.10 is another schematic diagram of the structure of the energy conversion system provided by the present application. In the case where the energy conversion system includes two third switches (such as the third switch K9a and the third switch K9b), as Fig.10As shown in 10a, the energy conversion system also includes a motor 12, a first switch K7, a control module 22 and an AC / DC conversion module 32, wherein the motor 12 includes a three-phase winding (such as winding Z3a, winding Z3b and winding Z3n), and the AC / DC conversion module 32 includes a first bridge arm switch 321, three second bridge arm switches (such as second bridge arm switch 322a, second bridge arm switch 322b and second bridge arm switch 322n), wherein the first bridge arm switch 321, the second bridge arm switch 322a, the second bridge arm switch 322b and the second bridge arm switch 322n can constitute a four-bridge arm AC / DC converter. Optionally, the AC / DC conversion module 32 also includes a bus capacitor C3 and a bidirectional DC / DC converter 323, and the input / output end of the bidirectional DC / DC converter 323 can be used as the input / output end of the AC / DC conversion module 32, and the specific circuit topology of the AC / DC conversion module 32 can be determined according to the actual application scenario, which is not limited here.

[0097] In some feasible embodiments, when the motor 12 is driven and the battery module is charged at the same time, the control module 22 can control the first switch K7, the third switch K9a and the third switch K9b to be turned on, control the second switch K8a, the second switch K8b and the second switch K8n to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C3 based on the voltage provided by the AC power supply Vg. Among them, the action of each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S51, the lower arm switch S62, the lower arm switch S64 and the lower arm switch S6q are turned on, and the lower arm switch S52, the upper arm switch S61, the upper arm switch S63 and the upper arm switch S6q-1 are turned off. Furthermore, the control module 22 can control the bidirectional DC / DC converter 323 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 12 and charging the battery module at the same time. In the process of driving the motor 12 and charging the battery module at the same time, the winding Z3a, the winding Z3b and the winding Z3n can be used as the filter inductor of the AC / DC conversion module 32, and form a power factor correction circuit with the AC / DC conversion module 32 to improve the power utilization rate; in addition, the control module 22 can obtain the differential mode voltage (also called the differential mode component) and the common mode voltage (also called the common mode component) based on the voltage provided by the AC power supply Vg, wherein the differential mode voltage can be used to control the speed of the motor 12, and the common mode voltage can be used to control the charging current of the battery module. That is to say, in the process of driving the motor 12 and charging the battery module at the same time, the speed of the motor 12 can be adjusted based on the differential mode voltage, and the charging current of the battery module can be adjusted based on the common mode voltage, thereby improving the flexibility of the system and making it more applicable.

[0098] In some feasible embodiments, when the motor 12 is driven alone, the control module 22 can control the bidirectional DC / DC converter 323 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 22 can control the first switch K7, the second switch K8a, the second switch K8b and the second switch K8n to be disconnected, control the third switch K9a and the third switch K9b to be turned on, and control the actions of the second bridge arm switches in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 12. In the process of driving the motor 12, the current of the driving motor 12 will not flow through the filter inductor L3a, the filter inductor L3b and the filter inductor L3n, thereby avoiding energy loss to improve the motor driving efficiency; in addition, the control module 22 can achieve the purpose of driving the motor 12 alone through switch control, thereby improving the convenience of driving the motor 12 and making it more applicable.

[0099] In some feasible embodiments, when charging the battery module alone, the control module 22 can control the first switch K7, the third switch K9a and the third switch K9b to be disconnected, control the second switch K8a, the second switch K8b and the second switch K8n to be turned on, and control the switch actions of each bridge arm in the four-bridge-arm AC / DC converter, so that the four-bridge-arm AC / DC converter performs a voltage step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 323. Further, the control module 22 can control the bidirectional DC / DC converter 323 to charge the battery module based on the DC voltage. In the process of charging the battery module, the filter inductor L3a, the filter inductor L3b and the filter inductor L3n can be used as the filter inductor of the AC / DC conversion module 32, and form a three-phase power factor correction circuit with the AC / DC conversion module 32 to improve the power utilization rate, and realize the power factor correction function and the battery charging function, and the battery charging efficiency is higher and the applicability is stronger.

[0100] In some feasible implementations, when the energy conversion system includes a third switch (such as the third switch K9a), Fig.10As shown in 10b, when the motor 12 is driven and the battery module is charged at the same time, the control module 22 can control the first switch K7 and the third switch K9a to be turned on, control the second switch K8a, the second switch K8b and the second switch K8n to be turned off, and control the action of each bridge arm switch in the four-bridge arm AC / DC converter, so that the four-bridge arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C3 based on the voltage provided by the AC power supply Vg. Among them, the action of each bridge arm switch in the four-bridge arm AC / DC converter can be understood as: the upper bridge arm switch S51, the lower bridge arm switch S62, the lower bridge arm switch S64 and the lower bridge arm switch S6q are turned on, and the lower bridge arm switch S52, the upper bridge arm switch S61, the upper bridge arm switch S63 and the upper bridge arm switch S6q-1 are turned off. Furthermore, the control module 22 may control the bidirectional DC / DC converter 323 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 12 and charging the battery module at the same time.

[0101] In some feasible embodiments, when the motor 12 is driven alone, the control module 22 can control the bidirectional DC / DC converter 323 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 22 can control the first switch K7, the second switch K8a, the second switch K8b, and the second switch K8n to be disconnected, control the third switch K9a to be turned on, and control the second arm switches in the four-arm AC / DC converter to act, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 12. When the battery module is charged alone, the control module 22 can control the first switch K7 and the third switch K9a to be disconnected, control the second switch K8a, the second switch K8b, and the second switch K8n to be turned on, and control the arm switches in the four-arm AC / DC converter to act, so that the four-arm AC / DC converter performs a step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 323. Furthermore, the control module 22 may control the bidirectional DC / DC converter 323 to charge the battery module based on the DC voltage.

[0102] In some feasible implementations, when the energy conversion system does not include a third switch, such as Fig.10As shown in 10c, when the motor 12 is driven and the battery module is charged at the same time, the control module 22 can control the first switch K7 to be turned on, control the second switch K8a, the second switch K8b and the second switch K8n to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C3 based on the voltage provided by the AC power supply Vg. Among them, the action of each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S51, the lower arm switch S62, the lower arm switch S64 and the lower arm switch S6q are turned on, and the lower arm switch S52, the upper arm switch S61, the upper arm switch S63 and the upper arm switch S6q-1 are turned off. Furthermore, the control module 22 may control the bidirectional DC / DC converter 323 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 12 and charging the battery module at the same time.

[0103] In some feasible embodiments, when the motor 12 is driven alone, the control module 22 can control the bidirectional DC / DC converter 323 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 22 can control the first switch K7, the second switch K8a, the second switch K8b, and the second switch K8n to be disconnected, and control the actions of the second bridge arm switches in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 12. When the battery module is charged alone, the control module 22 can control the first switch K7 to be disconnected, control the second switch K8a, the second switch K8b, and the second switch K8n to be turned on, and control the actions of the bridge arm switches in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 323. Furthermore, the control module 22 may control the bidirectional DC / DC converter 323 to charge the battery module based on the DC voltage.

[0104] In some feasible implementations, when the circuit topology of the above energy conversion system is a two-phase PFC circuit, the energy conversion system includes two filter inductors (such as filter inductor L3a and filter inductor L3b) and two second switches (second switch K8a and second switch K8b). For the specific circuit structure of the energy conversion system, please refer to Fig.11 , Fig.11 is another schematic diagram of the structure of the energy conversion system provided by the present application. In the case where the energy conversion system includes two third switches (such as the third switch K9a and the third switch K9b), as Fig.11As shown in 11a, the energy conversion system also includes a motor 12, a first switch K7, a control module 22 and an AC / DC conversion module 32, wherein the motor 12 includes a three-phase winding (such as winding Z3a, winding Z3b and winding Z3n), the AC / DC conversion module 32 includes a first bridge arm switch 321, three second bridge arm switches (such as second bridge arm switch 322a, second bridge arm switch 322b and second bridge arm switch 322n), a bus capacitor C3 and a bidirectional DC / DC converter 323, wherein the first bridge arm switch 321, the second bridge arm switch 322a, the second bridge arm switch 322b and the second bridge arm switch 322n can constitute a four-bridge arm AC / DC converter.

[0105] In some feasible embodiments, when the motor 12 is driven and the battery module is charged at the same time, the control module 22 can control the first switch K7, the third switch K9a and the third switch K9b to be turned on, control the second switch K8a and the second switch K8b to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C3 based on the voltage provided by the AC power supply Vg. Among them, the action of each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S51, the lower arm switch S62, the lower arm switch S64 and the lower arm switch S6q are turned on, and the lower arm switch S52, the upper arm switch S61, the upper arm switch S63 and the upper arm switch S6q-1 are turned off. Furthermore, the control module 22 can control the bidirectional DC / DC converter 323 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 12 and charging the battery module at the same time. In the process of driving the motor 12 and charging the battery module at the same time, the winding Z3a, the winding Z3b and the winding Z3n can be used as the filter inductor of the AC / DC conversion module 32, and form a power factor correction circuit with the AC / DC conversion module 32 to improve the power utilization rate; in addition, the control module 22 can obtain the differential mode voltage (also called the differential mode component) and the common mode voltage (also called the common mode component) based on the voltage provided by the AC power supply Vg, wherein the differential mode voltage can be used to control the speed of the motor 12, and the common mode voltage can be used to control the charging current of the battery module. That is to say, in the process of driving the motor 12 and charging the battery module at the same time, the speed of the motor 12 can be adjusted based on the differential mode voltage, and the charging current of the battery module can be adjusted based on the common mode voltage, thereby improving the flexibility of the system and making it more applicable.

[0106] In some feasible embodiments, when the motor 12 is driven alone, the control module 22 can control the bidirectional DC / DC converter 323 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 22 can control the first switch K7, the second switch K8a and the second switch K8b to be disconnected, control the third switch K9a and the third switch K9b to be turned on, and control the actions of the second bridge arm switches in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 12. In the process of driving the motor 12, the current of the driving motor 12 will not flow through the filter inductor L3a and the filter inductor L3b, thereby avoiding energy loss to improve the motor driving efficiency; in addition, the control module 22 can achieve the purpose of driving the motor 12 alone through switch control, thereby improving the convenience of driving the motor 12 and having strong applicability.

[0107] In some feasible embodiments, when charging the battery module alone, the control module 22 can control the first switch K7, the third switch K9a and the third switch K9b to be disconnected, control the second switch K8a and the second switch K8b to be turned on, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a voltage step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 323. Further, the control module 22 can control the bidirectional DC / DC converter 323 to charge the battery module based on the DC voltage. In the process of charging the battery module, the filter inductor L3a and the filter inductor L3b can be used as the filter inductor of the AC / DC conversion module 32, and form a two-phase power factor correction circuit with the AC / DC conversion module 32 to improve the power utilization rate, and realize the power factor correction function and the battery charging function, and the battery charging efficiency is higher and the applicability is stronger.

[0108] In some feasible implementations, when the energy conversion system includes a third switch (such as the third switch K9a), Fig.11As shown in 11b, when the motor 12 is driven and the battery module is charged at the same time, the control module 22 can control the first switch K7 and the third switch K9a to be turned on, control the second switch K8a and the second switch K8b to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C3 based on the voltage provided by the AC power supply Vg. Among them, the action of each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S51, the lower arm switch S62, the lower arm switch S64 and the lower arm switch S6q are turned on, and the lower arm switch S52, the upper arm switch S61, the upper arm switch S63 and the upper arm switch S6q-1 are turned off. Furthermore, the control module 22 may control the bidirectional DC / DC converter 323 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 12 and charging the battery module at the same time.

[0109] In some feasible embodiments, when the motor 12 is driven alone, the control module 22 can control the bidirectional DC / DC converter 323 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 22 can control the first switch K7, the second switch K8a, and the second switch K8b to be disconnected, control the third switch K9a to be turned on, and control the second arm switches in the four-arm AC / DC converter to act, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 12. When the battery module is charged alone, the control module 22 can control the first switch K7 and the third switch K9a to be disconnected, control the second switch K8a, the second switch K8b, and the second switch K8n to be turned on, and control the arm switches in the four-arm AC / DC converter to act, so that the four-arm AC / DC converter performs a step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 323. Furthermore, the control module 22 may control the bidirectional DC / DC converter 323 to charge the battery module based on the DC voltage.

[0110] In some feasible implementations, when the energy conversion system does not include a third switch, such as Fig.11As shown in 11c, when the motor 12 is driven and the battery module is charged at the same time, the control module 22 can control the first switch K7 to be turned on, control the second switch K8a and the second switch K8b to be turned off, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter obtains a differential mode voltage based on the voltage provided by the AC power supply Vg to drive the motor 12, and forms a common mode voltage (such as bus voltage) at both ends of the bus capacitor C3 based on the voltage provided by the AC power supply Vg. Among them, the action of each arm switch in the four-arm AC / DC converter can be understood as: the upper arm switch S51, the lower arm switch S62, the lower arm switch S64 and the lower arm switch S6q are turned on, and the lower arm switch S52, the upper arm switch S61, the upper arm switch S63 and the upper arm switch S6q-1 are turned off. Furthermore, the control module 22 may control the bidirectional DC / DC converter 323 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 12 and charging the battery module at the same time.

[0111] In some feasible embodiments, when the motor 12 is driven alone, the control module 22 can control the bidirectional DC / DC converter 323 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 22 can control the first switch K7, the second switch K8a, and the second switch K8b to be disconnected, and control the actions of each second arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-down conversion on the DC voltage to obtain an AC voltage to drive the motor 12. When the battery module is charged alone, the control module 22 can control the first switch K7 to be disconnected, control the second switch K8a, the second switch K8b, and the second switch K8n to be turned on, and control the actions of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 323. Further, the control module 22 can control the bidirectional DC / DC converter 323 to charge the battery module based on the DC voltage.

[0112] In the energy conversion system provided in the present application, the control module 22 can control the first switch K7, the second switch K8a to the second switch K8n, the third switch K9a to the third switch K9t, the first bridge arm switch 321 and the second bridge arm switch 322a to the second bridge arm switch 322n to work in coordination, so as to drive the motor 12 and charge the battery module at the same time, or drive the motor 12 alone, or charge the battery module alone, thereby improving the flexibility of the entire energy conversion system and achieving higher energy conversion efficiency; in addition, since the energy conversion system can integrate the motor 12 and the on-board charger, the high-voltage network resonance point of the energy conversion system is reduced to improve the system stability, and at the same time reduce the number of high-voltage components used in the energy conversion system, thereby reducing the system cost, making the structure simpler and more applicable.

[0113] Optionally, in some possible implementations, see Fig.12 , Fig.12 is another schematic diagram of the structure of the energy conversion system provided by the present application. Fig.12 As shown, the energy conversion system includes a motor 13, a control module 23, an AC / DC conversion module 33, at least one filter inductor (such as filter inductor L4a to filter inductor L4n) and at least one switch (such as switch Q1a to switch Q1n). The above-mentioned AC / DC conversion module 33 may include but is not limited to a first bridge arm switch 331 and a plurality of second bridge arm switches (such as second bridge arm switch 332a to second bridge arm switch 332n) connected in parallel with the first bridge arm switch 331. Among them, the first bridge arm switch 331 includes an upper bridge arm switch S71 and a lower bridge arm switch S72 connected in series, the bridge arm midpoint of the first bridge arm switch 331 refers to the series connection point of the upper bridge arm switch S71 and the lower bridge arm switch S72, and the upper bridge arm switch S71 and the lower bridge arm switch S72 are complementary and conductive; the second bridge arm switch 332a includes an upper bridge arm switch S81 and a lower bridge arm switch S82 connected in series, the bridge arm midpoint of the second bridge arm switch 332a refers to the series connection point of the upper bridge arm switch S81 and the lower bridge arm switch S82, and the upper bridge arm switch S81 and the lower bridge arm switch S82 are complementary and conductive; the second bridge arm switch 332a includes an upper bridge arm switch S81 and a lower bridge arm switch S82 connected in series, the bridge arm midpoint of the second bridge arm switch 332a refers to the series connection point of the upper bridge arm switch S81 and the lower bridge arm switch S82, and the upper bridge arm switch S81 and the lower bridge arm switch S82 are complementary and conductive; The switch 332b includes an upper bridge arm switch S83 and a lower bridge arm switch S84 connected in series, and the midpoint of the bridge arm of the second bridge arm switch 332b refers to the series connection point of the upper bridge arm switch S83 and the lower bridge arm switch S84, and the upper bridge arm switch S83 and the lower bridge arm switch S84 are complementarily conductive; ..., the second bridge arm switch 332n includes an upper bridge arm switch S8q-1 and a lower bridge arm switch S8q connected in series, and the midpoint of the bridge arm of the second bridge arm switch 332n refers to the series connection point of the upper bridge arm switch S8q-1 and the lower bridge arm switch S8q, and the upper bridge arm switch S8q-1 and the lower bridge arm switch S8q are complementarily conductive.

[0114] In some feasible implementations, the midpoint of the bridge arm of the first bridge arm switch 331 can be connected to the first connection end of the AC power source Vg, the midpoints of the bridge arms of the second bridge arm switches 332a to 332n can be connected to the first connection end of the multi-phase winding (such as windings Z4a to Z4n) in the motor 13, and the second connection ends of the windings of each phase in the windings Z4a to Z4n are connected. For example, the midpoint of the bridge arm of the second bridge arm switch 332a can be connected to the first connection end of the winding Z4a, the midpoint of the bridge arm of the second bridge arm switch 332b can be connected to the first connection end of the winding Z4b, ..., the midpoint of the bridge arm of the second bridge arm switch 332n can be connected to the first connection end of the winding Z4n. The midpoint of the bridge arm of the second bridge arm switch 332a to the second bridge arm switch 332n can be connected to the second connection end of the AC power source Vg through the filter inductor L4a to the filter inductor L4n and the switch Q1a to the switch Q1n, and the input / output end of the AC / DC conversion module 33 can be connected to the battery module. The input / output end of the AC / DC conversion module 33 here can be understood as the parallel connection end of the first bridge arm switch 331 and the second bridge arm switch 332a to the second bridge arm switch 332n.

[0115] In some feasible embodiments, the control module 23 may include but is not limited to a control board, a control chip or a controller; the control module 23 may establish a wired connection or a wireless connection with the switches Q1a to Q1n, the first bridge arm switch 331, and the second bridge arm switch 332a to the second bridge arm switch 332n, which may be determined according to the actual application scenario and is not limited here. In the case of driving the motor 13 and charging the battery module at the same time, the input / output end of the AC / DC conversion module 33 may be used as the output end of the AC / DC conversion module 33 to connect the battery module. The control module 23 may control each switch in the switches Q1a to Q1n to be turned on or off, and control the actions of each bridge arm switch in the first bridge arm switch 331 and the second bridge arm switch 332a to the second bridge arm switch 332n, so as to achieve the purpose of driving the motor 13 based on the voltage provided by the AC power supply Vg and charging the battery module. At this time, the electrical frequency of the motor 13 is the same as the voltage of the AC power supply Vg, that is, the motor 13 runs at a fixed frequency (that is, the motor 13 runs at the same speed). Among them, the on or off of each switch in the switch Q1a to the switch Q1n can be understood as: each switch in the switch Q1a to the switch Q1n can be on or off, that is, each switch has two working states (i.e., on state or off state), and it should be noted that the working states of different switches in the switch Q1a to the switch Q1n can be the same or different. In the case of driving the motor 13 and charging the battery module at the same time, a part of the switches in the switch Q1a to the switch Q1n are on (i.e., a part of the switches are in the on state), and another part of the switches in the switch Q1a to the switch Q1n are off (i.e., the other part of the switches are in the off state).

[0116] In some feasible implementations, when a portion of switches Q1a to Q1n are turned on, another portion of switches Q1a to Q1n are turned off, and each of the second bridge arm switches 332a to 332n cooperates to operate, the purpose of obtaining a first voltage based on the voltage provided by the AC power source Vg to drive the motor 13 can be achieved, wherein the first voltage can be determined by a portion of the current diverted from the input current provided by the AC power source Vg. When a portion of switches Q1a to Q1n are turned on, another portion of switches Q1a to Q1n are turned off, and each of the first bridge arm switches 331 and the second bridge arm switches 332a to 332n cooperate to operate, the purpose of obtaining a second voltage based on the voltage provided by the AC power source Vg to charge the battery module can be achieved, wherein the second voltage can be determined by another portion of the current diverted from the input current provided by the AC power source Vg. It can be seen that the control module 23 can control the switches Q1a to Q1n and the first arm switch 331 and the second arm switch 332a to 332n to work in coordination, so as to achieve the purpose of driving the motor 13 and charging the battery module at the same time, thereby improving the energy conversion efficiency, reducing the resonance in the energy conversion system, and improving the system stability; in addition, the number of high-voltage components used in the energy conversion system can be reduced, and there is no need to reuse the multi-phase windings in the motor 13 as filter inductors, that is, there is no need to customize and design the multi-phase windings in the motor 13, which greatly reduces the system cost and the design complexity of the motor 13, and the structure is simpler and has strong applicability.

[0117] In some feasible embodiments, for the entire energy conversion system, the energy conversion system can integrate the motor 13, the filter inductor L4a to the filter inductor L4n and the AC / DC conversion module 33, wherein the filter inductor L4a to the filter inductor L4n and the AC / DC conversion module 33 can constitute the on-board charger in the above-mentioned electric vehicle, that is, the energy conversion system can integrate the motor 13 and the on-board charger, and there is no need to use a high-voltage distribution box to integrate the motor 13 and the on-board charger, thereby greatly reducing the number of high-voltage components used in the energy conversion system and making the structure simpler; secondly, the energy conversion system uses a control module 23 to realize the simultaneous operation of the motor 13 and the on-board charger (which can charge the battery module), thereby greatly reducing the controller cost and having strong applicability. In addition, the energy conversion system can reuse the first bridge arm switch 331 and each bridge arm switch from the second bridge arm switch 332a to the second bridge arm switch 332n to achieve the purpose of simultaneous operation of the motor 13 and the on-board charger. That is to say, the high-voltage output part of the on-board charger and the high-voltage input part of the motor 13 share the signal circuit (that is, the circuit composed of each bridge arm switch), thereby reducing the high-voltage network resonance point of the energy conversion system, further improving the system stability, and making it more applicable.

[0118] In some possible implementations, such as Fig.12 As shown, the filter inductors L4a to L4n include a first filter inductor (such as filter inductor L4a) and at least one second filter inductor (such as filter inductor L4b to filter inductor L4n), the switches Q1a to Q1n include a first switch (such as switch Q1a) and at least one second switch (such as switch Q1b to switch Q1n), and each second filter inductor in the filter inductors L4b to L4n is connected in series with a second switch in the switches Q1b to Q1n, for example, the filter inductor L4b is connected in series with the switch Q1b, ..., the filter inductor L4n is connected in series with the switch Q1n. The bridge arm midpoint of the target second bridge arm switch in the second bridge arm switches 332a to 332n can be connected to the second connection end of the AC power source Vg through the filter inductor L4a and the switch Q1a, and the bridge arm midpoint of each second bridge arm switch in the other second bridge arm switches can be connected to the switch Q1a through a filter inductor and a switch connected in series. The target second bridge arm switch here refers to any one of the second bridge arm switches 332a to the second bridge arm switch 332n, and the other second bridge arm switches refer to the bridge arm switches other than the target second bridge arm switch from the second bridge arm switch 332a to the second bridge arm switch 332n, as described above. Fig.12As shown, the target second bridge arm switch is the second bridge arm switch 332a, and the other second bridge arm switches are the second bridge arm switches 332b to the second bridge arm switches 332n. At this time, the bridge arm midpoint of the second bridge arm switch 332b can be connected to one end of the switch Q1a through the series-connected filter inductor L4b and the switch Q1b, ..., the bridge arm midpoint of the second bridge arm switch 332n can be connected to one end of the switch Q1a through the series-connected filter inductor L4n and the switch Q1n, and the other end of the switch Q1a is connected to the second connection end of the AC power source Vg.

[0119] Optionally, in some feasible implementations, the bridge arm midpoint of the second bridge arm switch 332a can be connected to the second connection end of the AC power source Vg through the filter inductor L4a and the switch Q1a, the bridge arm midpoint of the second bridge arm switch 332b can be connected to the second connection end of the AC power source Vg through the filter inductor L4b and the switch Q1b, ..., the bridge arm midpoint of the second bridge arm switch 332n can be connected to the second connection end of the AC power source Vg through the filter inductor L4n and the switch Q1n. It should be noted that the specific connection relationship between the second bridge arm switch 332a to the second bridge arm switch 332n, the filter inductor L4a to the filter inductor L4n, the switch Q1a to the switch Q1n, and the AC power source Vg can be determined according to the actual application scenario, and is not limited here. In the case of driving the motor 13 and charging the battery module at the same time, the control module 23 can control the switch Q1a (i.e., a part of the switches from switch Q1a to switch Q1n) to be turned on, control the second switches from the switches Q1b to switch Q1n (i.e., another part of the switches from switch Q1a to switch Q1n) to be turned off, and control the first bridge arm switch 331 and the second bridge arm switches 332a to the second bridge arm switches 332n to operate, thereby achieving the purpose of driving the motor 13 and charging the battery module at the same time. When the switch Q1a is turned on and the switches Q1b to switch Q1n are turned off, the filter inductor L4a can be used as the filter inductor of the AC / DC conversion module 33, and form a single-phase power factor correction circuit with the AC / DC conversion module 33 to improve the power utilization rate, further improve the energy conversion efficiency, and have stronger applicability.

[0120] In some feasible embodiments, in the case of driving the motor 13 alone, the input / output end of the AC / DC conversion module 33 can be used as the input end of the AC / DC conversion module 33. The control module 23 can also control the switches Q1a to Q1n to be disconnected, and control the second bridge arm switches 332a to 332n to operate, so that the AC / DC conversion module 33 performs a step-down conversion on the voltage provided by the battery module to obtain an AC voltage to drive the motor 13. At this time, the energy conversion system is in a motor single working mode. When the switches Q1a to Q1n are disconnected, the current driving the motor 13 will not flow through the filter inductor L4a to the filter inductor L4n, thereby avoiding energy loss and improving the driving efficiency of the motor 13; in addition, the control module 23 can control the switches Q1a to Q1n and the second bridge arm switches to work together to achieve the purpose of driving the motor 13 alone, which can improve the convenience of driving the motor 13 and make it more applicable.

[0121] In some feasible implementations, when charging the battery module alone, the input / output end of the AC / DC conversion module 33 can be used as the output end of the AC / DC conversion module 33. The control module 23 can also control the conduction of each switch among the switches Q1a to Q1n, and control the operation of each bridge arm switch among the first bridge arm switch 331 and the second bridge arm switch 332a to 332n, so that the AC / DC conversion module 31 performs a step-up conversion on the voltage provided by the AC power source Vg to obtain a DC voltage to charge the battery module alone. At this time, the energy conversion system is in a battery charging mode alone. When the switches Q1a to Q1n are turned on, the filter inductors L4a to L4n can be used as the filter inductors of the AC / DC conversion module 33, and form a power factor correction circuit with the AC / DC conversion module 33 to improve the power utilization rate, thereby improving the charging efficiency of the battery; and the charging current of the battery module will not flow through the multi-phase windings in the motor 13. Therefore, in the process of charging the battery module, it is not necessary to reuse the multi-phase windings in the motor 13 as the filter inductors of the AC / DC conversion module 33, that is, it is not necessary to customize and design the multi-phase windings in the motor 13, which further reduces the design complexity and system cost of the motor 13. In addition, the control module 23 can control the switches Q1a to Q1n and the bridge arm switches to work together to achieve the purpose of charging the battery module, thereby improving the convenience and efficiency of battery charging, and having stronger applicability.

[0122] In some feasible implementations, the above Fig.12The motor 13 shown may include but is not limited to a three-phase motor and a six-phase motor. The specific type of the motor 13 may be determined according to the actual application scenario and is not limited here. For example, when the motor 13 is a three-phase motor, the multi-phase winding may be a three-phase winding; when the motor 13 is a six-phase motor, the multi-phase winding may be a six-phase winding. For the convenience of description, the motor 13 is a three-phase motor as an example for description below, and no further description is given below. When the circuit topology of the energy conversion system is a three-phase PFC circuit (i.e., a three-phase interleaved parallel circuit), the number of filter inductors L4a to L4n and the number of switches Q1a to Q1n are both 3; when the circuit topology of the energy conversion system is a two-phase PFC circuit (i.e., a two-phase interleaved parallel circuit), the number of filter inductors L4a to L4n and the number of switches Q1a to Q1n are both 2; when the circuit topology of the energy conversion system is a single-phase PFC circuit, the number of filter inductors L4a to L4n and the number of switches Q1a to Q1n are both 1. Please also see Fig.13 , Fig.13 It is another structural schematic diagram of the energy conversion system provided by this application.

[0123] In some feasible implementations, when the circuit topology of the energy conversion system is a three-phase PFC circuit, the energy conversion system includes three filter inductors (such as filter inductor L4a, filter inductor L4b and filter inductor L4n), and three switches (such as switch Q1a, switch Q1b and switch Q1n). The specific circuit structure of the energy conversion system is as follows: Fig.13 As shown in 13a, the energy conversion system also includes a motor 13 and an AC / DC conversion module 33, wherein the motor 13 includes a three-phase winding (such as winding Z4a, winding Z4b and winding Z4n), and the AC / DC conversion module 33 includes a first bridge arm switch 331, three second bridge arm switches (such as second bridge arm switch 332a, second bridge arm switch 332b and second bridge arm switch 332n), wherein the first bridge arm switch 331, the second bridge arm switch 332a, the second bridge arm switch 332b and the second bridge arm switch 332n can constitute a four-bridge arm AC / DC converter. Optionally, the AC / DC conversion module 33 also includes a bus capacitor C4 and a bidirectional DC / DC converter 333, and the input / output end of the bidirectional DC / DC converter 333 can be used as the input / output end of the AC / DC conversion module 33, and the specific circuit topology of the AC / DC conversion module 33 can be determined according to the actual application scenario, which is not limited here.

[0124] In some feasible implementations, when the motor 13 is driven and the battery module is charged at the same time, the control module 23 can control the switch Q1a to be turned on, control the switch Q1b and the switch Q1n to be turned off, and control the switch action of each bridge arm in the four-bridge-arm AC / DC converter, so that the four-bridge-arm AC / DC converter obtains a first voltage based on the voltage provided by the AC power supply Vg to drive the motor 13, and forms a second voltage (such as a bus voltage) at both ends of the bus capacitor C4 based on the voltage provided by the AC power supply Vg. Further, the control module 23 can control the bidirectional DC / DC converter 333 to charge the battery module based on the bus voltage, thereby achieving the purpose of driving the motor 13 and charging the battery module at the same time. In the process of simultaneously driving the motor 13 and charging the battery module, the input current provided by the AC power supply Vg (i.e., the current flowing through the filter inductor L4a, which can be expressed as ia1) can be diverted into current ia2 and current ia3 (i.e., ia1=ia2+ia3), wherein the current ia2 (i.e., a part of the current diverted by the input current provided by the above-mentioned AC power supply Vg) can be used to determine the first voltage to drive the motor 13, and the current ia3 (i.e., another part of the current diverted by the input current provided by the AC power supply Vg) can be used to determine the second voltage to charge the battery module, thereby achieving the purpose of simultaneously driving the motor 13 and charging the battery module, and improving the energy conversion efficiency; in addition, the above-mentioned filter inductor L4a can be used as the filter inductor of the AC / DC conversion module 33, and constitute a single-phase power factor correction circuit with the AC / DC conversion module 33 to improve power utilization, with higher energy conversion efficiency and stronger applicability.

[0125] In some feasible embodiments, when the motor 13 is driven alone, the control module 23 can control the bidirectional DC / DC converter 333 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 23 can control the switch Q1a, the switch Q1b and the switch Q1n to be disconnected, and control the action of each second arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter can obtain an AC voltage after step-down conversion of the DC voltage to drive the motor 13. In the process of driving the motor 13, the current of the driving motor 13 will not flow through the filter inductor L4a, the filter inductor L4b and the filter inductor L4n, thereby avoiding energy loss to improve the motor driving efficiency; in addition, the control module 23 can achieve the purpose of driving the motor 13 alone through switch control, thereby improving the convenience of driving the motor 13 and making it more applicable.

[0126] In some feasible embodiments, when charging the battery module alone, the control module 23 can control the switch Q1a, switch Q1b and switch Q1n to be turned on, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a voltage step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 333. Further, the control module 23 can control the bidirectional DC / DC converter 333 to charge the battery module based on the DC voltage. In the process of charging the battery module, the filter inductor L4a, the filter inductor L4b and the filter inductor L4n can be used as the filter inductor of the AC / DC conversion module 33, and form a three-phase power factor correction circuit with the AC / DC conversion module 33 to improve the power utilization rate, and realize the power factor correction function and the battery charging function, and the battery charging efficiency is higher and the applicability is stronger.

[0127] In some feasible implementations, when the circuit topology of the energy conversion system is a two-phase PFC circuit, there are two filter inductors (such as filter inductor L4a and filter inductor L4b) and two switches (such as switch Q1a and switch Q1b) in the energy conversion system. The specific circuit structure of the energy conversion system is as follows: Fig.13 As shown in 13b, the energy conversion system also includes a motor 13 and an AC / DC conversion module 33, wherein the motor 13 includes a winding Z4a, a winding Z4b and a winding Z4n, and the AC / DC conversion module 33 includes a first bridge arm switch 331, a second bridge arm switch 332a, a second bridge arm switch 332b, a second bridge arm switch 332n, a bus capacitor C4 and a bidirectional DC / DC converter 333, wherein the first bridge arm switch 331, the second bridge arm switch 332a, the second bridge arm switch 332b and the second bridge arm switch 332n can constitute a four-bridge arm AC / DC converter. In the case of driving the motor 13 and charging the battery module at the same time, the control module 23 can control the switch Q1a to be turned on, the switch Q1b to be turned off, and the switch actions of each bridge arm in the four-bridge-arm AC / DC converter can be controlled, so that the four-bridge-arm AC / DC converter obtains a first voltage based on the voltage provided by the AC power supply Vg to drive the motor 13, and forms a second voltage (such as a bus voltage) at both ends of the bus capacitor C4 based on the voltage provided by the AC power supply Vg. Further, the control module 23 can control the bidirectional DC / DC converter 333 to charge the battery module based on the bus voltage, so as to achieve the purpose of driving the motor 13 and charging the battery module at the same time.

[0128] In some feasible embodiments, when the motor 13 is driven alone, the control module 23 can control the bidirectional DC / DC converter 333 to output a DC voltage to the four-arm AC / DC converter based on the DC voltage provided by the battery module. Further, the control module 23 can control the switch Q1a and the switch Q1b to be disconnected, and control the action of each second arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter can obtain an AC voltage after step-down conversion of the DC voltage to drive the motor 13. In the process of driving the motor 13, the current of the driving motor 13 will not flow through the filter inductor L4a and the filter inductor L4b, thereby avoiding energy loss to improve the motor driving efficiency; in addition, the control module 23 can achieve the purpose of driving the motor 13 alone through switch control, thereby improving the convenience of driving the motor 13 and making it more applicable.

[0129] In some feasible embodiments, when charging the battery module alone, the control module 21 can control the switch Q1a and the switch Q1b to be turned on, and control the action of each arm switch in the four-arm AC / DC converter, so that the four-arm AC / DC converter performs a voltage step-up conversion on the voltage provided by the AC power source Vg to output a DC voltage to the bidirectional DC / DC converter 333. Further, the control module 23 can control the bidirectional DC / DC converter 333 to charge the battery module based on the DC voltage. In the process of charging the battery module, the filter inductor L4a and the filter inductor L4b can be used as the filter inductor of the AC / DC conversion module 33, and form a two-phase power factor correction circuit with the AC / DC conversion module 33 to improve the power utilization rate, and realize the power factor correction function and the battery charging function, and the battery charging efficiency is higher and the applicability is stronger.

[0130] In the energy conversion system provided in the present application, the control module 23 can control the switches Q1a to Q1n, the first bridge arm switch 331 and the second bridge arm switch 332a to the second bridge arm switch 332n to work in coordination, thereby driving the motor 13 and charging the battery module at the same time, or driving the motor 13 alone, or charging the battery module alone, thereby improving the flexibility of the entire energy conversion system and achieving higher energy conversion efficiency; in addition, since the energy conversion system can integrate the motor 13 and the on-board charger, the high-voltage network resonance point of the energy conversion system is reduced to improve the system stability, and at the same time, the number of high-voltage components used in the energy conversion system is reduced, thereby reducing the system cost, making the structure simpler and more applicable.

[0131] For further information, see Fig.14 , Fig.14 The power system provided in this application is applicable to the above-mentioned electric equipment. The specific structure of the power system is as follows: Fig.14 As shown, the power system includes a battery module and an energy conversion system (as described above Figures 2 to 13 The energy conversion system shown in the figure), wherein the battery module may include but is not limited to a high-voltage battery and a low-voltage battery. The high-voltage battery here may refer to a power source that provides a power source for electric equipment, and the high-voltage battery may include but is not limited to a ternary lithium battery, a lithium iron phosphate battery and other high-voltage batteries. Since the above-mentioned energy conversion system can drive the motor and charge the battery module at the same time, or drive the motor alone, or charge the battery module alone, it can improve the working efficiency and flexibility of the power system, and the structure is simpler and the cost is low; in addition, the above-mentioned energy conversion system can integrate the motor and the on-board charger, and there is no need to use a high-voltage distribution box to integrate the motor and the on-board charger, thereby reducing the number of high-voltage components used in the power system, lowering the cost and enhancing applicability.

[0132] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An energy conversion system, It is characterized in that The energy conversion system includes a motor, a control module, an AC / DC conversion module, a first switch, at least one filter inductor, and at least one second switch, wherein a first connection end of a filter inductor in the at least one filter inductor is connected to a first connection end of an AC power source through a second switch in the at least one second switch; The AC / DC conversion module includes a first bridge arm switch and a plurality of second bridge arm switches connected in parallel with the first bridge arm switch, the bridge arm midpoint of the first bridge arm switch is connected to the second connection end of the AC power supply, the bridge arm midpoint of each of the plurality of second bridge arm switches is coupled to the second connection end of a filter inductor, the bridge arm midpoint of the plurality of second bridge arm switches is connected to the second connection end of the first filter inductor of the at least one filter inductor through the multi-phase winding in the motor, the first filter inductor is any one of the at least one filter inductor, and the first switch is arranged between the second connection end of the first filter inductor and the bridge arm midpoint of the second bridge arm switch coupled thereto, and the input / output end of the AC / DC conversion module is connected to the battery module; The control module is used to control the first switch to be disconnected, each of the at least one second switch to be turned on or off, and to control the action of the first bridge arm switch and each of the multiple second bridge arm switches to drive the motor and charge the battery module based on the voltage provided by the AC power supply.

2. The system according to claim 1, It is characterized in that The control module is used to control the second switch connected to the first filter inductor to be turned on, and control the other second switches to be turned off.

3. The system according to claim 2, It is characterized in that The energy conversion system further comprises at least two third switches, each of the at least two third switches being connected in series with a phase winding in the multi-phase winding; a bridge arm midpoint of each second bridge arm switch in the plurality of second bridge arm switches being connected to a second connection end of the first filter inductor via a third switch connected in series and the phase winding; The control module is used to control the second switch connected to the first filter inductor and the at least two third switches to be turned on, and control the first switch and the other second switches to be turned off.

4. The system according to claim 3, It is characterized in that The control module is also used to control the first switch and the at least one second switch to be disconnected, the at least two third switches to be turned on, and to control each of the plurality of second bridge arm switches to operate so as to drive the motor based on the voltage provided by the battery module.

5. The system according to claim 3, It is characterized in that The control module is also used to control the first switch and the at least one second switch to be turned on and the at least two third switches to be turned off, and to control the first bridge arm switch and each bridge arm switch in the multiple second bridge arm switches to operate so as to charge the battery module based on the voltage provided by the AC power supply.

6. An energy conversion system, It is characterized in that The energy conversion system includes a motor, a control module, an AC / DC conversion module, a first switch, at least one filter inductor and at least one second switch, wherein a filter inductor of the at least one filter inductor is connected in series with a second switch of the at least one second switch and then connected to a first connection terminal of an AC power source; The AC / DC conversion module includes a first bridge arm switch and a plurality of second bridge arm switches connected in parallel with the first bridge arm switch, the bridge arm midpoint of the first bridge arm switch is connected to the second connection end of the AC power supply, the bridge arm midpoint of each second bridge arm switch in the plurality of second bridge arm switches is connected to a target second switch in the at least one second switch through a filter inductor and one phase winding in the multi-phase winding of the motor, the target second switch is any one of the at least one second switch, the first switch is arranged between the target second switch and the filter inductor connected in series therewith, and the input / output end of the AC / DC conversion module is connected to a battery module; The control module is used to control the first switch to be disconnected, each of the at least one second switch to be turned on or off, and to control the action of the first bridge arm switch and each of the multiple second bridge arm switches to drive the motor and charge the battery module based on the voltage provided by the AC power supply.

7. The system according to claim 6, It is characterized in that The control module is used to control the target second switch to be turned on, and control the first switch and other second switches to be turned off.

8. The system according to claim 7, It is characterized in that The energy conversion system further comprises at least two third switches, each of the at least two third switches is connected in series with the one-phase winding; each of the at least one filter inductor is connected to the target second switch through a third switch and the one-phase winding connected in series; The control module is used to control the target second switch and the at least two third switches to be turned on, and control the first switch and the other second switches to be turned off.

9. The system according to claim 8, It is characterized in that The control module is also used to control the first switch and the at least one second switch to be disconnected, the at least two third switches to be turned on, and to control each of the plurality of second bridge arm switches to operate so as to drive the motor based on the voltage provided by the battery module.

10. The system according to claim 8, It is characterized in that The control module is also used to control the first switch and the at least one second switch to be turned on and the at least two third switches to be turned off, and to control the first bridge arm switch and each bridge arm switch in the multiple second bridge arm switches to operate so as to charge the battery module based on the voltage provided by the AC power supply.

11. An energy conversion system, It is characterized in that The energy conversion system includes a motor, a control module, an AC / DC conversion module, a first switch, at least one filter inductor, and at least one second switch. A first connection end of one of the at least one filter inductors is connected to a first connection end of an AC power supply through one of the at least one second switches; Wherein, the AC / DC conversion module includes a first leg switch and a plurality of second leg switches connected in parallel with the first leg switch. A midpoint of the leg of the first leg switch is connected to a second connection end of the AC power supply. A midpoint of the leg of each of the plurality of second leg switches is connected to a second connection end of one of the filter inductors. The midpoints of the legs of the plurality of second leg switches are connected to a first connection end of the first switch through a multi-phase winding in the motor, and a second connection end of the first switch is connected to the first connection end of the AC power supply. An input / output end of the AC / DC conversion module is connected to a battery module; The control module is configured to control the first switch to conduct, the at least one second switch to disconnect, and control the actions of each leg switch in the first leg switch and the plurality of second leg switches, so as to drive the motor based on the voltage provided by the AC power supply and charge the battery module.

12. The system according to claim 11, wherein, The energy conversion system further includes at least one third switch. Each of the at least one third switches is connected in series with one phase winding of the multi-phase winding; The midpoint of the leg of each of the plurality of second leg switches is connected to the first connection end of the first switch through a series-connected third switch and the one phase winding; The control module is configured to control the first switch and the at least one third switch to conduct, and control the at least one second switch to disconnect.

13. The system according to claim 12, wherein, The control module is further configured to control the first switch and the at least one second switch to disconnect, the at least one third switch to conduct, and control the actions of each of the plurality of second leg switches to drive the motor based on the voltage provided by the battery module.

14. The system according to claim 12, wherein, The control module is further configured to control the first switch and the at least one third switch to disconnect, the at least one second switch to conduct, and control the actions of each leg switch in the first leg switch and the plurality of second leg switches to charge the battery module based on the voltage provided by the AC power supply.

15. An energy conversion system, wherein, The energy conversion system includes a motor, a control module, an AC / DC conversion module, a first switch, a first filter inductor, at least one second filter inductor, and at least one second switch. Each of the at least one second filter inductors is connected in series with one of the at least one second switches; Wherein, the AC / DC conversion module includes a first bridge arm switch and a plurality of second bridge arm switches connected in parallel with the first bridge arm switch, the bridge arm midpoint of the first bridge arm switch is connected to the first connection end of the AC power supply, the bridge arm midpoints of the plurality of second bridge arm switches are connected to the first connection end of the multi-phase winding in the motor, the second connection ends of each phase winding in the multi-phase winding are connected, the bridge arm midpoint of the target second bridge arm switch among the plurality of second bridge arm switches is connected to the second connection end of the AC power supply through the first filter inductor and the first switch, the target second bridge arm switch is any one of the plurality of second bridge arm switches, the bridge arm midpoint of each second bridge arm switch among the other second bridge arm switches is connected to the first switch through a second filter inductor and a second switch connected in series, and the input / output end of the AC / DC conversion module is connected to the battery module; The control module is used to control the first switch to be turned on and the at least one second switch to be turned off, and to control the action of the first bridge arm switch and each of the multiple second bridge arm switches, so as to drive the motor and charge the battery module based on the voltage provided by the AC power supply.

16. The system according to claim 15, It is characterized in that The control module is further used to control the first switch and the at least one second switch to be disconnected, and to control each of the plurality of second bridge arm switches to operate so as to drive the motor based on the voltage provided by the battery module.

17. The system according to claim 15, It is characterized in that The control module is also used to control the first switch and the at least one second switch to be turned on, and to control the first bridge arm switch and each bridge arm switch in the plurality of second bridge arm switches to operate, so as to charge the battery module based on the voltage provided by the AC power supply.

18. A power system, It is characterized in that The power system comprises a battery module and an energy conversion system as described in any one of claims 1-17.

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