Vehicle-mounted charging and discharging circuit and method

Abstract

The invention discloses a vehicle-mounted charging and discharging circuit and method, and relates to the technical field of power supplies, and the circuit comprises a controller, a first switching module, a second switching module, a multi-stage filter circuit, and a power factor correction circuit. The controller controls the first switching module to switch a first connection mode between the multi-stage filter circuit and the external device based on the current external device, and controls the second switching module to switch a second connection mode between the multi-stage filter circuit and the power factor correction circuit. The multi-stage filter circuit is matched with the power factor correction circuit to be switched to a corresponding working mode to work, so that alternating current of a specific type is efficiently transmitted, and the multi-stage filter circuit is compatible with a charging function and a reverse discharging function through any one of single-phase alternating current, two-phase alternating current and three-phase alternating current. And different power grid structures adopted by customers in different regions can be coped with, meanwhile, the electricity utilization safety is ensured, and dangerous accidents caused by excessive electric energy stored in the circuit are avoided.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a vehicle-mounted charging and discharging circuit and method. Background Art

[0002] In the prior art, due to certain differences in power grid modes between different regions, the on-board charger (OBC) of the whole vehicle needs to be configured according to the power grid types in different regions. Common power grid types include at least single-phase AC power grid, two-phase AC power grid and three-phase AC power grid. If the type of power grid that can be used to configure the on-board OBC is too single, for example, it is only applicable to three-phase AC power grid, then other regions that use single-phase AC power grid or two-phase AC power grid cannot be used, which is not conducive to the promotion and sales of the product. In addition, as people pay more and more attention to the safety of products, in some specific scenarios, such as too much electrical energy stored in the car, it is also necessary to discharge the car. Therefore, there is an urgent need for a vehicle-mounted OBC product that is compatible with single-phase, two-phase, and three-phase charging and discharging functions. Summary of the invention

[0003] The main purpose of this application is to provide a vehicle-mounted charging and discharging circuit and method, aiming to solve the technical problem of how to make electric vehicles compatible with single-phase, two-phase, and three-phase charging and discharging functions.

[0004] To achieve the above-mentioned purpose, an embodiment of the present application provides a vehicle-mounted charging and discharging circuit, which includes: a first switching module, a second switching module, a multi-stage filtering circuit, a power factor correction circuit and a controller;

[0005] The multi-stage filter circuit includes a plurality of input interfaces and a plurality of output interfaces corresponding to each other; the input end of the first switching module is connected to an external device including any one of a single-phase power supply, a two-phase power supply, a three-phase power supply and a load, and the output end of the first switching module is used to connect to one of the input interfaces of the multi-stage filter circuit; the output end of the second switching module is connected to the power factor correction circuit, and the input end of the second switching module is used to connect to one of the output interfaces of the multi-stage filter circuit; the controller is respectively connected to the first switching module and the second switching module;

[0006] The controller is used to output corresponding control signals to the first switching module and the second switching module based on the type of the external device;

[0007] The first switching module is used to switch the first connection mode between each input interface of the multi-stage filtering circuit and the external device based on the control signal;

[0008] The second switching module is used to switch the second connection mode between each output interface of the multi-stage filtering circuit and the power factor correction circuit based on the control signal;

[0009] The multi-stage filtering circuit is used to perform multi-stage filtering on the corresponding type of AC power transmitted between the external device and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the corresponding working mode for operation;

[0010] The working modes include a single-phase mode corresponding to the single-phase power supply, a two-phase mode corresponding to the two-phase power supply, a three-phase mode corresponding to the three-phase power supply, and a discharge mode corresponding to the load.

[0011] In one embodiment, the external device is the single-phase power supply, the control signal includes a single-phase control signal, each of the input interfaces includes a single-phase input interface, and each of the output interfaces includes a single-phase output interface;

[0012] The controller is further configured to output the single-phase control signal to the first switching module and the second switching module based on the single-phase power supply;

[0013] The first switching module is further used to switch to a first connection mode in which the single-phase input interface is connected to the single-phase power supply based on the single-phase control signal;

[0014] The second switching module is further used to switch to a second connection mode in which the single-phase output interface is connected to the power factor correction circuit based on the single-phase control signal;

[0015] The multi-stage filtering circuit is also used to perform multi-stage filtering on the single-phase alternating current transmitted between the single-phase power supply and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the single-phase mode for operation.

[0016] In one embodiment, the external device is the three-phase power supply, the control signal includes a three-phase control signal, each of the input interfaces includes a three-phase input interface, and each of the output interfaces includes a three-phase output interface;

[0017] The controller is further configured to output the three-phase control signal to the first switching module and the second switching module based on the three-phase power supply;

[0018] The first switching module is further used to switch to a first connection mode in which the three-phase input interface is connected to the three-phase power supply based on the three-phase control signal;

[0019] The second switching module is further used to switch to a second connection mode in which the three-phase output interface is connected to the power factor correction circuit based on the three-phase control signal;

[0020] The multi-stage filtering circuit is also used to perform multi-stage filtering on the three-phase alternating current transmitted between the three-phase power supply and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the three-phase mode for operation.

[0021] In one embodiment, the external device is the two-phase power supply, the control signal includes a two-phase control signal, each of the input interfaces includes a two-phase input interface, and each of the output interfaces includes a two-phase output interface;

[0022] The controller is further configured to output the two-phase control signal to the first switching module and the second switching module based on the two-phase power supply;

[0023] The first switching module is further used to switch to a first connection mode in which the two-phase input interface is connected to the two-phase power supply based on the two-phase control signal;

[0024] The second switching module is further used to switch to a second connection mode in which the two-phase output interface is connected to the power factor correction circuit based on the two-phase control signal;

[0025] The multi-stage filtering circuit is also used to perform multi-stage filtering on the two-phase alternating current transmitted between the two-phase power supply and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the two-phase mode for operation.

[0026] In one embodiment, the external device is the load, the control signal includes a discharge control signal, each of the input interfaces includes an external discharge interface, and each of the output interfaces includes an internal discharge interface;

[0027] The controller is further configured to output the discharge control signal to the first switching module and the second switching module based on the load;

[0028] The first switching module is further used to switch to a first connection mode of connecting the external discharge interface and the load based on the discharge control signal;

[0029] The second switching module is further used to switch to a second connection mode in which the internal discharge interface is connected to the power factor correction circuit based on the discharge control signal;

[0030] The multi-stage filtering circuit is also used to perform multi-stage filtering on the alternating current transmitted between the load and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the discharge mode for operation.

[0031] In one embodiment, the multi-stage filter circuit includes: first to seventeenth capacitors and first to eighth inductors;

[0032] The first end of the first inductor is respectively connected to the first output end of the first switching module, the discharge output end of the first switching module and the first end of the first capacitor, and the second end of the first inductor is respectively connected to the first end of the fifth inductor, the first end of the fourth capacitor and the first end of the eighth capacitor; the first end of the second inductor is respectively connected to the second output end of the first switching module and the first end of the second capacitor, and the second end of the second inductor is respectively connected to the first end of the sixth inductor, the first end of the fifth capacitor and the first end of the ninth capacitor; the first end of the third inductor is respectively connected to the third output end of the first switching module and the first end of the third capacitor, and the second end of the third inductor is respectively connected to the first end of the seventh inductor, the first end of the sixth capacitor and the first end of the tenth capacitor; the first end of the fourth inductor is respectively connected to the fourth output end of the first switching module, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor, and the second end of the fourth inductor is respectively connected to the first end of the eighth inductor, the first end of the seventh capacitor, the second end of the eighth capacitor, the first end of the ninth capacitor The second end of the fifth inductor is respectively connected to the first end of the eleventh capacitor, the first end of the fifteenth capacitor and the first input end of the power factor correction circuit, the second end of the sixth inductor is respectively connected to the first end of the twelfth capacitor, the first end of the sixteenth capacitor and the second input end of the power factor correction circuit, the second end of the seventh inductor is respectively connected to the first end of the thirteenth capacitor, the first end of the seventeenth capacitor, the first input end of the second switching module and the third input end of the power factor correction circuit, the second end of the eighth inductor is respectively connected to the first end of the fourteenth capacitor and the second input end of the switching module, the second end of the fifteenth capacitor, the second end of the sixteenth capacitor and the second end of the seventeenth capacitor are connected to the third input end of the switching module; the second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor, the second end of the seventh capacitor, the second end of the eleventh capacitor, the second end of the twelfth capacitor, the second end of the thirteenth capacitor and the second end of the fourteenth capacitor are grounded.

[0033] In one embodiment, the first switching module includes: first to seventh switches, first to third resistors, and eighteenth to twenty-first capacitors, the second switch, the fourth switch, and the seventh switch are single-pole double-throw switches, and the second end and the third end of the single-pole double-throw switch are used for switching;

[0034] The first end of the first switch is respectively connected to the first end of the first resistor and the first phase interface, the second end of the first switch is respectively connected to the second end of the fourth switch, the first end of the second switch and the first end of the first inductor; the second end of the second switch is connected to the second end of the first resistor, and the third end of the second switch is connected to the first discharge interface; the first end of the third switch is respectively connected to the first end of the second resistor, the first end of the eighteenth band content and the second phase interface, the second end of the second switch is respectively connected to the first end of the fourth switch, the third end of the seventh switch and the first end of the second inductor; the third end of the fourth switch is connected to the second end of the second resistor; the first end of the fifth switch is respectively connected to the first end of the third resistor, the first end of the nineteenth capacitor and the third phase interface, the second end of the fifth switch is respectively connected to the second end of the sixth switch and the first end of the seventh switch; the first end of the sixth switch is connected to the second end of the third resistor; the second end of the seventh switch is connected to the first end of the third inductor; the first end of the twentieth capacitor is respectively connected to the second discharge interface, the single-phase interface, the first end of the twenty-first capacitor and the fourth inductor; the second end of the eighteenth capacitor, the second end of the nineteenth capacitor, the second end of the twentieth capacitor and the second end of the twenty-first capacitor are grounded;

[0035] Among them, the first-phase interface, the second-phase interface, the third-phase interface and the single-phase interface are used to form a three-phase port, and the three-phase port is connected to the three-phase power supply; the first-phase interface, the second-phase interface and the single-phase interface or any one of the first-phase interface, the third-phase interface and the single-phase interface are used to form a two-phase port, and the two-phase port is connected to the two-phase power supply; the single-phase interface is used to form a single-phase port alone, and the single-phase port is connected to the single-phase power supply; the first discharge interface and the second discharge interface are used to form a discharge port, and the discharge port is connected to the load.

[0036] In one embodiment, the second switching module includes: an eighth switch and a ninth switch, the eighth switch is a single-pole double-throw switch, and the second end and the third end of the single-pole double-throw switch are used for switching;

[0037] The first end of the eighth switch is respectively connected to the second end of the ninth switch, the second end of the fifteenth capacitor, the second end of the sixteenth capacitor and the second end of the seventeenth capacitor; the second end of the eighth switch is connected to the fourth input end of the power factor correction circuit; the third end of the eighth switch is respectively connected to the third input end of the power factor correction circuit and the second end of the seventh inductor; the first end of the ninth switch is respectively connected to the second end of the eighth inductor and the first end of the fourteenth capacitor.

[0038] In one embodiment, the power factor correction circuit includes: a ninth inductor, a tenth inductor, an eleventh inductor and a three-phase bridge circuit;

[0039] The first end of the ninth inductor is connected to the second end of the fifth inductor, and the second end of the ninth inductor is connected to the first phase bridge arm of the three-phase bridge circuit; the first end of the tenth inductor is connected to the second end of the sixth inductor, and the second end of the tenth inductor is connected to the second phase bridge arm of the three-phase bridge circuit; the first end of the eleventh inductor is connected to the second end of the seventh inductor, and the second end of the eleventh inductor is connected to the third phase bridge arm of the three-phase bridge circuit; the bus midpoint of the three-phase bridge circuit is connected to the second end of the eighth switch.

[0040] In addition, to achieve the above-mentioned purpose, the present application also provides a vehicle-mounted charging and discharging method, the steps of the vehicle-mounted charging and discharging method comprising:

[0041] Based on the type of the currently connected external device, a corresponding control signal is generated;

[0042] Based on the control signal, a first connection mode between the multi-stage filter circuit and the external device is switched through a first switching module, and a second connection mode between the multi-stage filter circuit and the power factor correction circuit is switched through a second switching module;

[0043] Based on the first connection mode and the second connection mode, the multi-stage filtering circuit is controlled to perform multi-stage filtering on the corresponding type of alternating current transmitted between the external device and the power factor correction circuit, so as to cooperate with the power factor correction circuit to switch to the corresponding working mode for operation;

[0044] Among them, the external device includes any one of a single-phase power supply, a two-phase power supply, a three-phase power supply and a load, and the working mode includes a single-phase mode corresponding to the single-phase power supply, a two-phase mode corresponding to the two-phase power supply, a three-phase mode corresponding to the three-phase power supply and a discharge mode corresponding to the load.

[0045] An embodiment of the present application provides a vehicle-mounted charging and discharging circuit and method, wherein the vehicle-mounted charging and discharging circuit includes: a first switching module, a second switching module, a multi-stage filtering circuit, a power factor correction circuit and a controller; the multi-stage filtering circuit includes multiple input interfaces and multiple corresponding output interfaces; the input end of the first switching module is connected to an external device including any one of a single-phase power supply, a two-phase power supply, a three-phase power supply and a load, and the output end of the first switching module is used to connect to one of the input interfaces of the multi-stage filtering circuit; the output end of the second switching module is connected to the power factor correction circuit, and the input end of the second switching module is used to connect to one of the output interfaces of the multi-stage filtering circuit; the controller is connected to the first switching module and the second switching module respectively; the controller is used to output a corresponding output based on the type of the external device. A control signal is sent to the first switching module and the second switching module; the first switching module is used to switch the first connection mode between each input interface of the multi-stage filtering circuit and the external device based on the control signal; the second switching module is used to switch the second connection mode between each output interface of the multi-stage filtering circuit and the power factor correction circuit based on the control signal; the multi-stage filtering circuit is used to perform multi-stage filtering on the corresponding type of alternating current transmitted between the external device and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the corresponding working mode for operation; the working mode includes the single-phase mode corresponding to the single-phase power supply, the two-phase mode corresponding to the two-phase power supply, the three-phase mode corresponding to the three-phase power supply and the discharge mode corresponding to the load. Based on the external device connected to the current circuit, the controller controls the first switching module to switch the first connection mode between the multi-stage filter circuit and the external device, and controls the second switching module to switch the second connection mode between the multi-stage filter circuit and the power factor correction circuit, so that the multi-stage filter circuit cooperates with the power factor correction circuit to switch to the corresponding working mode to work, so as to efficiently transmit a specific type of AC power, and is compatible with the function of charging through any one of single-phase AC power, two-phase AC power and three-phase AC power, and the function of reverse discharge when too much electric energy is stored. It can cope with different power grid structures adopted by customers in different regions, and at the same time ensure the safety of electricity use, and avoid dangerous accidents caused by too much electric energy stored in the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0047] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0048] Figure 1 A structural connection diagram provided for the first embodiment of the vehicle-mounted charging and discharging circuit of the present application;

[0049] Figure 2 A structural connection diagram provided for the second embodiment of the vehicle-mounted charging and discharging circuit of the present application;

[0050] Figure 3 A circuit connection diagram provided for the third embodiment of the vehicle-mounted charging and discharging circuit of the present application;

[0051] Figure 4 A schematic diagram of the flow chart of the first embodiment of the vehicle-mounted charging and discharging method of the present application.

[0052] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0053] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0054] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0055] This application proposes a first embodiment of a vehicle-mounted charging and discharging circuit, please refer to Figure 1 , the vehicle-mounted charging and discharging circuit includes: a first switching module 20, a second switching module 30, a multi-stage filtering circuit 40, a power factor correction circuit 50 and a controller 10;

[0056] The multi-stage filter circuit 40 includes a plurality of input interfaces and a plurality of corresponding output interfaces; the input end of the first switching module 20 is connected to an external device 60 including any one of a single-phase power supply 61, a two-phase power supply 62, a three-phase power supply 63 and a load 64, and the output end of the first switching module 20 is used to connect to one of the input interfaces of the multi-stage filter circuit 40; the output end of the second switching module 30 is connected to the power factor correction circuit 50, and the input end of the second switching module 30 is used to connect to one of the output interfaces of the multi-stage filter circuit 40; the controller 10 is connected to the first switching module 20 and the second switching module 30 respectively;

[0057] The controller 10 is used to output corresponding control signals to the first switching module 20 and the second switching module 30 based on the type of the external device 60;

[0058] The first switching module 20 is used to switch the first connection mode between each input interface of the multi-stage filtering circuit 40 and the external device 60 based on the control signal;

[0059] The second switching module 30 is used to switch the second connection mode between each output interface of the multi-stage filter circuit 40 and the power factor correction circuit 50 based on the control signal;

[0060] The multi-stage filtering circuit 40 is used to perform multi-stage filtering on the corresponding type of AC power transmitted between the external device 60 and the power factor correction circuit 50 based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit 50 to switch to the corresponding working mode for operation;

[0061] The working modes include a single-phase mode corresponding to the single-phase power supply 61 , a two-phase mode corresponding to the two-phase power supply 62 , a three-phase mode corresponding to the three-phase power supply 63 , and a discharge mode corresponding to the load 64 .

[0062] It should be noted that, in the present embodiment, the multi-stage filter circuit 40 has multiple input interfaces and multiple output interfaces, and can transmit various types of alternating current through a corresponding set of input interfaces and output interfaces or multiple sets of input interfaces and multiple sets of output interfaces, and perform multi-stage filtering on the transmitted alternating current, so that the corresponding transmission efficiency and stability are higher when the power is transmitted between the external device 60 and the power factor correction circuit 50, thereby making the working efficiency of the power factor correction circuit 50 higher and safer. Among them, the external device 60 can be a single-phase power supply 61, a two-phase power supply 62, a three-phase power supply 63 and a load 64, and the types of alternating current transmitted between the external device 60 and the power factor correction circuit 50 can at least include single-phase alternating current, two-phase alternating current and three-phase alternating current, and the alternating current can be bidirectionally transmitted between the external device 60 and the power factor correction circuit 50 through the multi-stage filter circuit 40, that is, the functions of "charging" and "discharging" can be realized.

[0063] It should be understood that, in this embodiment, the first switching module 20 has a plurality of external interfaces, such as a first discharge interface, a second discharge interface, a first phase interface, a second phase interface, a third phase interface and a single-phase interface. Among them, the first discharge interface and the second discharge interface can be connected to the load 64, the first phase interface, the second phase interface and the third phase interface can be connected to the three-phase power supply 63, and any two phase interfaces among the first phase interface, the second phase interface and the third phase interface can be connected to the two-phase power supply 62, and the single-phase interface can be connected to the single-phase power supply 61 alone. Therefore, the first switching module 20 can first be connected to the external device 60 including any one of the single-phase power supply 61, the two-phase power supply 62, the three-phase power supply 63 and the load 64 through the above-mentioned external interfaces, and then connected to the multi-stage filter circuit 40 through the output end corresponding to each external interface, so that the first connection mode between the external device 60 currently connected to each external interface and the multi-stage filter circuit 40 can be changed through the first switching module 20 to form a connection loop that can transmit the corresponding type of alternating current. The second switching module 30 can be connected to the power factor correction circuit 50, and can also be connected to a corresponding one of the output interfaces of the multi-stage filter circuit 40. Therefore, the second connection mode between the multi-stage filter circuit 40 and the power factor correction circuit 50 can be changed by the second switching module 30 to form a connection loop that can transmit the corresponding type of alternating current. In this way, the first connection mode between the multi-stage filter circuit 40 and the external device 60 can be switched by controlling the first switching module 20, and the second connection mode between the multi-stage filter circuit 40 and the power factor correction circuit 50 can be switched by controlling the second switching module 30, so that the multi-stage filter circuit 40 transmits the corresponding type of alternating current between the external device 60 and the power factor correction circuit 50 through a corresponding set of input interfaces and output interfaces, and performs multi-stage filtering on the transmitted alternating current.

[0064] It is easy to understand that in this embodiment, the first switching module 20 and the second switching module 30 can be controlled by the controller 10. The controller 10 can be integrated with a voltage acquisition module that can collect the voltage on each external interface and can also accept externally transmitted control instructions. By collecting the voltage on each external interface, the amount of AC power output by the connected external device 60 and the voltage can be identified to identify whether the current external device 60 is a single-phase power supply 61, a two-phase power supply 62 or a three-phase power supply 63. It is also possible to determine whether the current first discharge interface and the second discharge interface are connected to the load 64 through the received externally transmitted user-triggered control instruction, thereby generating a corresponding control signal. The controller 10 transmits the corresponding control signal to the first switching module 20 and the second switching module 30, so that the first connection mode between the multi-stage filter circuit 40 and the external device 60 and the second connection mode between the multi-stage filter circuit 40 and the power factor correction circuit 50 can be switched simultaneously through the cooperation of the first switching module 20 and the second switching module 30, so that the multi-stage filter circuit 40 cooperates with the power factor correction circuit 50 to switch to the current type of working mode of the corresponding external device 60 to work, and then the specific type of alternating current that the current external device 60 can send or receive can be transmitted, and finally the "charging" or "discharging" work is completed. It can also be understood that the vehicle-mounted charging and discharging circuit proposed in this application can realize the functions of single-phase charging, two-phase charging, and three-phase charging, and can be compatible with complex power grid modes in different regions to meet the different needs of customers in different regions. In addition, it also has the function of reverse discharge, which can actively discharge when there is too much electric energy, effectively preventing the risks caused by excessive electric energy stored in the circuit, and having higher safety.

[0065] It is worth noting that, in the present embodiment, the working modes of the power factor correction circuit 50 may include a single-phase mode, a two-phase mode, a three-phase mode, and a discharge mode. The single-phase mode refers to a working mode in which the power factor correction circuit 50 converts the single-phase AC power sent by the external device 60 into DC power and performs DC charging for the load connected to the subsequent stage. The two-phase mode refers to a working mode in which the power factor correction circuit 50 converts the two-phase AC power sent by the external device 60 into DC power and performs DC charging for the load connected to the subsequent stage. The three-phase mode refers to a working mode in which the power factor correction circuit 50 converts the three-phase AC power sent by the external device 60 into DC power and performs DC charging for the load connected to the subsequent stage. The discharge mode refers to a working mode in which the power factor correction circuit 50 converts the internally stored electric energy into AC power and transmits it in reverse to the load 64 for discharge.

[0066] An embodiment of the present application provides a vehicle-mounted charging and discharging circuit, which includes: a first switching module, a second switching module, a multi-stage filtering circuit, a power factor correction circuit and a controller; the multi-stage filtering circuit includes multiple input interfaces and multiple corresponding output interfaces; the input end of the first switching module is connected to an external device including any one of a single-phase power supply, a two-phase power supply, a three-phase power supply and a load, and the output end of the first switching module is used to connect to one of the input interfaces of the multi-stage filtering circuit; the output end of the second switching module is connected to the power factor correction circuit, and the input end of the second switching module is used to connect to one of the output interfaces of the multi-stage filtering circuit; the controller is respectively connected to the first switching module and the second A switching module; the controller is used to output corresponding control signals to the first switching module and the second switching module based on the type of the external device; the first switching module is used to switch the first connection mode between each input interface of the multi-stage filtering circuit and the external device based on the control signal; the second switching module is used to switch the second connection mode between each output interface of the multi-stage filtering circuit and the power factor correction circuit based on the control signal; the multi-stage filtering circuit is used to perform multi-stage filtering on the corresponding type of alternating current transmitted between the external device and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the corresponding working mode for operation. Based on the external device connected to the current circuit, the controller controls the first switching module to switch the first connection mode between the multi-stage filter circuit and the external device, and controls the second switching module to switch the second connection mode between the multi-stage filter circuit and the power factor correction circuit, so that the multi-stage filter circuit cooperates with the power factor correction circuit to switch to the corresponding working mode to work, so as to efficiently transmit a specific type of AC power, and is compatible with the function of charging through any one of single-phase AC power, two-phase AC power and three-phase AC power, and the function of reverse discharge when too much electric energy is stored. It can cope with different power grid structures adopted by customers in different regions, and at the same time ensure the safety of electricity use, and avoid dangerous accidents caused by too much electric energy stored in the circuit.

[0067] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can refer to the above introduction, and will not be repeated later. Figure 2 , the external device 60 is the single-phase power supply 61, the control signal includes a single-phase control signal, each of the input interfaces includes a single-phase input interface, and each of the output interfaces includes a single-phase output interface;

[0068] The controller 10 is further configured to output the single-phase control signal to the first switching module 20 and the second switching module 30 based on the single-phase power supply 61;

[0069] The first switching module 20 is further used to switch to a first connection mode in which the single-phase input interface is connected to the single-phase power supply 61 based on the single-phase control signal;

[0070] The second switching module 30 is further used to switch to a second connection mode in which the single-phase output interface is connected to the power factor correction circuit 50 based on the single-phase control signal;

[0071] The multi-stage filtering circuit 40 is also used to perform multi-stage filtering on the single-phase alternating current transmitted between the single-phase power supply 61 and the power factor correction circuit 50 based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit 50 to switch to the single-phase mode for operation.

[0072] It should be noted that, in the present embodiment, the external device 60 may be a single-phase power supply 61 capable of outputting single-phase alternating current. When the controller 10 identifies that the current external device 60 is a single-phase power supply 61, it may output a corresponding single-phase control signal to the first switching module 20 and the second switching module 30. At this time, the first switching module 20 switches the first connection mode between the external device 60 and the multi-stage filtering circuit 40, that is, the single-phase interface of the first switching module 20 is connected to the single-phase power supply 61, and the output end corresponding to the single-phase interface is connected to the single-phase input interface among the several input interfaces of the multi-stage filtering circuit 40; the second switching module 30 switches the second connection mode between the multi-stage filtering circuit 40 and the power factor correction circuit 50, that is, the input end of the second switching module 30 connected to the power factor correction circuit 50 is connected to the single-phase output interface among the several output interfaces of the multi-stage filtering circuit 40. After the above-mentioned switching process, the multi-stage filtering circuit 40 cooperates with the power factor correction circuit 50 to switch the current working mode to a single-phase mode that can convert single-phase AC power into DC power. Correspondingly, a connection circuit that can transmit single-phase AC power and perform multi-stage filtering on the single-phase AC power is formed between the single-phase power supply 61 and the power factor correction circuit 50, and the function of DC charging the load connected to the rear stage of the power factor correction circuit 50 can be realized by the single-phase AC power output by the single-phase power supply 61.

[0073] Further, the external device 60 is the three-phase power supply 63, the control signal includes a three-phase control signal, each of the input interfaces includes a three-phase input interface, and each of the output interfaces includes a three-phase output interface;

[0074] The controller 10 is further configured to output the three-phase control signal to the first switching module 20 and the second switching module 30 based on the three-phase power supply 63;

[0075] The first switching module 20 is further used to switch to a first connection mode in which the three-phase input interface is connected to the three-phase power supply 63 based on the three-phase control signal;

[0076] The second switching module 30 is further used to switch to a second connection mode in which the three-phase output interface is connected to the power factor correction circuit 50 based on the three-phase control signal;

[0077] The multi-stage filtering circuit 40 is also used to perform multi-stage filtering on the three-phase alternating current transmitted between the three-phase power supply 63 and the power factor correction circuit 50 based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit 50 to switch to the three-phase mode for operation.

[0078] It should be noted that, in the present embodiment, the external device 60 may be a three-phase power supply 63 capable of outputting three-phase alternating current. When the controller 10 identifies that the current external device 60 is a three-phase power supply 63, it may output a corresponding three-phase control signal to the first switching module 20 and the second switching module 30. At this time, the first switching module 20 switches the first connection mode between the external device 60 and the multi-stage filter circuit 40, that is, the three-phase interface (first phase interface, second phase interface and third phase interface) of the first switching module 20 is connected to the three-phase power supply 63, and the output end corresponding to the three-phase interface is connected to the three-phase input interface among the several input interfaces of the multi-stage filter circuit 40; the second switching module 30 switches the second connection mode between the multi-stage filter circuit 40 and the power factor correction circuit 50, that is, the input end of the second switching module 30 connected to the power factor correction circuit 50 is connected to the three-phase output interface among the several output interfaces of the multi-stage filter circuit 40. After the above-mentioned switching process, the multi-stage filtering circuit 40 cooperates with the power factor correction circuit 50 to switch the current working mode to a three-phase mode that can convert three-phase AC power into DC power. Correspondingly, a connection circuit that can transmit three-phase AC power and perform multi-stage filtering on the three-phase AC power is formed between the three-phase power supply 63 and the power factor correction circuit 50, and the function of DC charging the load connected to the rear stage of the power factor correction circuit 50 can be realized by the three-phase AC power output by the three-phase power supply 63.

[0079] Further, in this embodiment, the external device 60 is the two-phase power supply 62, the control signal includes a two-phase control signal, each of the input interfaces includes a two-phase input interface, and each of the output interfaces includes a two-phase output interface;

[0080] The controller 10 is further configured to output the two-phase control signal to the first switching module 20 and the second switching module 30 based on the two-phase power supply 62;

[0081] The first switching module 20 is further used to switch to a first connection mode in which the two-phase input interface is connected to the two-phase power supply 62 based on the two-phase control signal;

[0082] The second switching module 30 is further used to switch to a second connection mode in which the two-phase output interface is connected to the power factor correction circuit 50 based on the two-phase control signal;

[0083] The multi-stage filtering circuit 40 is also used to perform multi-stage filtering on the two-phase AC power transmitted between the two-phase power supply 62 and the power factor correction circuit 50 based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit 50 to switch to the two-phase mode for operation.

[0084] It should be noted that, in the present embodiment, the external device 60 may be a two-phase power supply 62 capable of outputting two-phase alternating current. When the controller 10 identifies that the current external device 60 is a two-phase power supply 62, it may output a corresponding two-phase control signal to the first switching module 20 and the second switching module 30. At this time, the first switching module 20 switches the first connection mode between the external device 60 and the multi-stage filter circuit 40, that is, the two-phase interface of the first switching module 20 (the first phase interface, the second phase interface, and any two-phase interface of the second phase interface) is connected to the two-phase power supply 62, and the output end corresponding to the two-phase interface is connected to the two-phase input interface among the several input interfaces of the multi-stage filter circuit 40; the second switching module 30 switches the second connection mode between the multi-stage filter circuit 40 and the power factor correction circuit 50, that is, the input end of the second switching module 30 connected to the power factor correction circuit 50 is connected to the two-phase output interface among the several output interfaces of the multi-stage filter circuit 40. After the above-mentioned switching process, the multi-stage filtering circuit 40 cooperates with the power factor correction circuit 50 to switch the current working mode to a two-phase mode that can convert two-phase AC power into DC power. Correspondingly, a connection circuit that can transmit two-phase AC power and perform multi-stage filtering on the two-phase AC power is formed between the two-phase power supply 62 and the power factor correction circuit 50, and the function of DC charging the load connected to the rear stage of the power factor correction circuit 50 can be realized by the two-phase AC power output by the two-phase power supply 62.

[0085] Further, in this embodiment, the external device 60 is the load 64, the control signal includes a discharge control signal, each of the input interfaces includes an external discharge interface, and each of the output interfaces includes an internal discharge interface;

[0086] The controller 10 is further configured to output the discharge control signal to the first switching module 20 and the second switching module 30 based on the load 64;

[0087] The first switching module 20 is further configured to switch to a first connection mode in which the external discharge interface is connected to the load 64 based on the discharge control signal;

[0088] The second switching module 30 is further used to switch to a second connection mode in which the internal discharge interface is connected to the power factor correction circuit 50 based on the discharge control signal;

[0089] The multi-stage filtering circuit 40 is also used to perform multi-stage filtering on the AC power transmitted between the load 64 and the power factor correction circuit 50 based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit 50 to switch to the discharge mode for operation.

[0090] It should be noted that, in the present embodiment, the external device 60 may be a load 64 capable of consuming electric energy. When the controller 10 identifies that the current external device 60 is a load 64, it may output a corresponding discharge control signal to the first switching module 20 and the second switching module 30. At this time, the first switching module 20 switches the first connection mode between the external device 60 and the multi-stage filter circuit 40, that is, the external discharge interface (the first discharge interface and the second discharge interface) of the first switching module 20 is connected to the load 64, and the output end corresponding to the external discharge interface is connected to the discharge input interface among the several input interfaces of the multi-stage filter circuit 40; the second switching module 30 switches the second connection mode between the multi-stage filter circuit 40 and the power factor correction circuit 50, that is, the input end of the second switching module 30 connected to the power factor correction circuit 50 is connected to the discharge output interface among the several output interfaces of the multi-stage filter circuit 40. After the above-mentioned switching process, the multi-stage filtering circuit 40 cooperates with the power factor correction circuit 50 to switch the current working mode to the discharge mode that can convert direct current into alternating current. Correspondingly, a connection loop is formed between the load 64 and the power factor correction circuit 50, which can transmit the alternating current obtained by the power factor correction circuit 50 from converting direct current and perform multi-stage filtering on the alternating current. The function of reversely outputting the alternating current obtained by converting direct current through the power factor correction circuit 50 to the load 64 and discharging it can be realized.

[0091] Based on the first embodiment and / or the second embodiment of the present application, in the third embodiment of the present application, the same or similar contents as those of the above-mentioned first and second embodiments can refer to the above introduction, and will not be repeated later. Figure 3, the multi-stage filter circuit 40 includes: a first capacitor C1 to a seventeenth capacitor C17 and a first inductor L1 to an eighth inductor L8;

[0092] The first end of the first inductor L1 is respectively connected to the first output end of the first switching module 20, the discharge output end of the first switching module 20 and the first end of the first capacitor C1, and the second end of the first inductor L1 is respectively connected to the first end of the fifth inductor L5, the first end of the fourth capacitor C4 and the first end of the eighth capacitor C8; the first end of the second inductor L2 is respectively connected to the second output end of the first switching module 20 and the first end of the second capacitor C2, and the second end of the second inductor L2 is respectively connected to the first end of the sixth inductor L6, the first end of the fifth capacitor C5 and the first end of the ninth capacitor C9; the first end of the third inductor L3 is respectively connected to the first end of the fifth inductor L5, the first end of the fourth capacitor C4 and the first end of the eighth capacitor C8; the first ... third inductor L3 is respectively connected to the first end of the fifth inductor L5, the first end of the fourth capacitor C4 and the first end of the eighth capacitor C8; the first end of the second inductor L2 is respectively connected to the first end of the sixth inductor L6, the first end of the fifth capacitor C5 and the first end of the ninth capacitor The third output terminal of the first switching module 20 and the first end of the third capacitor C3 are connected, and the second end of the third inductor L3 is respectively connected to the first end of the seventh inductor L7, the first end of the sixth capacitor C6, and the first end of the tenth capacitor C10; the first end of the fourth inductor L4 is respectively connected to the fourth output terminal of the first switching module 20, the second end of the first capacitor C1, the second end of the second capacitor C2, and the second end of the third capacitor C3, and the second end of the fourth inductor L4 is respectively connected to the first end of the eighth inductor L8, the first end of the seventh capacitor C7, the second end of the eighth capacitor C8, and the second end of the ninth capacitor C9 and the second end of the tenth capacitor C10; the second end of the fifth inductor L5 is respectively connected to the first end of the eleventh capacitor C11, the first end of the fifteenth capacitor C15 and the first input end of the power factor correction circuit 50, the second end of the sixth inductor L6 is respectively connected to the first end of the twelfth capacitor C12, the first end of the sixteenth capacitor C16 and the second input end of the power factor correction circuit 50, the second end of the seventh inductor L7 is respectively connected to the first end of the thirteenth capacitor C13, the first end of the seventeenth capacitor C17, the first input end of the second switching module 30 and the third input end of the power factor correction circuit 50 The second end of the eighth inductor L8 is respectively connected to the first end of the fourteenth capacitor C14 and the second input end of the switching module, the second end of the fifteenth capacitor C15, the second end of the sixteenth capacitor C16 and the second end of the seventeenth capacitor C17 are connected to the third input end of the switching module; the second end of the fourth capacitor C4, the second end of the fifth capacitor C5, the second end of the sixth capacitor C6, the second end of the seventh capacitor C7, the second end of the eleventh capacitor C11, the second end of the twelfth capacitor C12, the second end of the thirteenth capacitor C13 and the second end of the fourteenth capacitor C14 are grounded.

[0093] It should be understood that Figure 3Although the external device 60 and the controller 10 are not shown in the figure, it cannot be considered that the external device 60 and the controller 10 are not connected in this embodiment. Figure 3 Multiple external interfaces (first discharge interface, second discharge interface, first phase interface, second phase interface, third phase interface, single-phase interface) connected to the external device 60 are drawn in the figure. Each external interface has a connection relationship with the external device 60, and the connection relationship is determined according to the type of the external device 60.

[0094] It should be noted that, in the present embodiment, the multi-stage filtering circuit 40 may have a three-stage filtering structure, wherein the first inductor L1 to the fourth inductor L4 are four common-mode inductors for suppressing common-mode noise, the first capacitor C1 to the third capacitor C3 are four X capacitors for filtering differential-mode interference, and together constitute a first-stage filtering structure; the fifth inductor L5 to the eighth inductor L8 are also four common-mode inductors for suppressing common-mode noise, the fourth capacitor C4 to the seventh capacitor C7 are four Y capacitors for filtering common-mode interference, the eighth capacitor C8 to the tenth capacitor C10 are three X capacitors for filtering differential-mode interference, and together constitute a second-stage filtering structure; the eleventh capacitor C11 to the fourteenth capacitor C14 are four Y capacitors for filtering common-mode interference, the fifteenth capacitor C15 to the seventeenth capacitor C17 are three X capacitors for filtering differential-mode interference, and together constitute a three-stage filtering structure. Through the above-mentioned first-stage filtering structure, second-stage filtering structure and third-stage filtering structure, since each filtering structure filters for a different frequency range, it is possible to transmit complete, high-quality alternating current in a specific frequency range, reduce electromagnetic interference in various types of transmitted alternating current, and improve the stability and work efficiency of the circuit.

[0095] It is worth noting that the first inductor L1 and the fifth inductor L5 also constitute a first phase transmission line for three-phase AC power transmission, the second inductor L2 and the sixth inductor L6 also constitute a second phase transmission line for three-phase AC power transmission, the third inductor L3 and the seventh inductor L7 also constitute a third phase transmission line for three-phase AC power transmission, and the fourth inductor L4 and the eighth inductor L8 also constitute a single-phase transmission line for single-phase AC power transmission. The first phase transmission line and the second phase transmission line or the first phase transmission line and the third phase transmission line can be used for two-phase AC power transmission. Therefore, the first end of the first inductor L1, the first end of the second inductor L2 and the first end of the third inductor L3 can be understood as the three-phase input interface (first phase input interface, second phase input interface and third phase input interface) of the multi-stage filter circuit 40 described above, and the first end of the fourth inductor L4 can be understood as the single-phase input interface of the multi-stage filter circuit 40 described above; the second end of the fifth inductor L5, the second end of the sixth inductor L6 and the second end of the seventh inductor L7 can be understood as the three-phase output interface (first phase output interface, second phase output interface and third phase output interface) of the multi-stage filter circuit 40 described above, and the second end of the eighth inductor L8 can be understood as the single-phase output interface of the multi-stage filter circuit 40 described above.

[0096] Further, in the present embodiment, the first switching module 20 includes: first switches K1 to K7, first resistors R1 to R3, and eighteenth capacitors C18 to C21, the second switch K2, the fourth switch K4, and the seventh switch K7 are single-pole double-throw switches, and the second end and the third end of the single-pole double-throw switch are used for switching;

[0097] The first end of the first switch K1 is respectively connected to the first end of the first resistor R1 and the first phase interface, and the second end of the first switch K1 is respectively connected to the second end of the fourth switch K4, the first end of the second switch K2 and the first end of the first inductor L1; the second end of the second switch K2 is connected to the second end of the first resistor R1, and the third end of the second switch K2 is connected to the first discharge interface; the first end of the third switch K3 is respectively connected to the first end of the second resistor R2, the first end of the eighteenth band content and the second phase interface, and the second end of the second switch K2 is respectively connected to the first end of the fourth switch K4, the third end of the seventh switch K7 and the first end of the second inductor L2; the third end of the fourth switch K4 is connected to the second resistor R 2; a first end of a fifth switch K5 is respectively connected to a first end of the third resistor R3, a first end of a nineteenth capacitor C19 and a third phase interface, a second end of the fifth switch K5 is respectively connected to a second end of a sixth switch K6 and a first end of a seventh switch K7; a first end of the sixth switch K6 is connected to a second end of the third resistor R3; a second end of the seventh switch K7 is connected to a first end of the third inductor L3; a first end of the twentieth capacitor C20 is respectively connected to a second discharge interface, a single-phase interface, a first end of a twenty-first capacitor C21 and the fourth inductor L4; a second end of the eighteenth capacitor C18, a second end of the nineteenth capacitor C19, a second end of the twentieth capacitor C20 and a second end of the twenty-first capacitor C21 are grounded;

[0098] Among them, the first-phase interface, the second-phase interface, the third-phase interface and the single-phase interface are used to form a three-phase port, and the three-phase port is connected to the three-phase power supply 63; the first-phase interface, the second-phase interface and the single-phase interface or any one of the first-phase interface, the third-phase interface and the single-phase interface are used to form a two-phase port, and the two-phase port is connected to the two-phase power supply 62; the single-phase interface is used to form a single-phase port alone, and the single-phase port is connected to the single-phase power supply 61; the first discharge interface and the second discharge interface are used to form a discharge port, and the discharge port is connected to the load 64.

[0099] It should be noted that, in this embodiment, the eighteenth capacitor C18 to the twenty-first capacitor C21 are four Y capacitors for filtering common mode interference, which are respectively connected in parallel between the first phase interface, the second phase interface, the third phase interface and the single-phase interface and the ground line, and can also be regarded as part of the primary filtering structure described above. The first resistor R1, the second resistor R2, and the third resistor R3 are three pre-charging resistors, which are respectively connected to their corresponding external interfaces (the first phase interface, the second phase interface, and the third phase interface). When the external interface to which they are connected is suddenly connected to a voltage, the pre-charging resistor can be connected to the loop by switching the on-off state of the corresponding switch for pre-charging, so as to prevent the instantaneous current generated by the external device 60 from being too large and damaging the circuit.

[0100] It is easy to understand that the second switch K2, the fourth switch K4 and the seventh switch K7 are single-pole double-throw switches, and the first end of the single-pole double-throw switch can be connected to any one of the second end or the third end thereof. In this embodiment, the controller 10 can change the on-off state or the connection state of the first switch K1 to the seventh switch K7 to change the connection relationship between each external interface and each input interface of the multi-stage filter circuit 40, thereby changing the first connection mode between the external device 60 and the multi-stage filter circuit 40.

[0101] It should be noted that the first connection mode corresponds to the working mode of the power factor correction circuit 50. In a specific implementation, the working mode can be roughly divided into a three-phase mode, a two-phase mode, a single-phase mode and a discharge mode, and the corresponding external devices 60 are three-phase power supply 63, two-phase power supply 62, single-phase power supply 61 and load 64. When the external device 60 is a three-phase power supply 63, the working mode is a three-phase mode, and the controller 10 controls the first switch K1 to be turned on, the third switch K3 to be turned on, the fifth switch K5 to be turned on, and the sixth switch K6 to be turned on for a preset time and then turned off (the preset time is the time taken for the pre-charging process of connecting to the third resistor R3), the second switch K2 is connected to its second end, the fourth switch K4 is connected to its third end, and the seventh switch K7 is connected to its second end. In this way, the three-phase power supply 63 can normally output three-phase AC power to the three-phase input interface of the multi-stage filtering circuit 40; when the external device 60 is a two-phase power supply 62, the working mode is a two-phase mode, which is divided into two phases. In the following situations, the controller 10 can determine which situation is the specific situation by detecting the voltage of the external interface. One is that the two-phase power supply 62 is respectively connected to the first phase interface and the third phase interface of each external interface. At this time, the controller 10 controls the first switch K1 to be turned on, the third switch K3 to be turned on, the fifth switch K5 to be turned on, and the sixth switch K6 to be turned on for a preset time and then turned off (the preset time is the time spent in the pre-charging process of connecting to the third resistor R3), the second switch K2 is connected to its second end, the fourth switch K4 is connected to its third end, and the seventh switch K7 is connected to its third end. In this way, the two-phase power supply 62 can normally output two-phase AC power to the multi-stage filter. The two-phase input interface (the first phase input interface and the third phase input interface) of the circuit 40; another case is that the two-phase power supply 62 is respectively connected to the first phase interface and the second phase interface of each external interface. At this time, the controller 10 controls the first switch K1 to be turned on, the third switch K3 to be turned on, the fifth switch K5 to be turned off, and the sixth switch K6 to be always turned off, the second switch K2 is connected to its second end, the fourth switch K4 is connected to its third end, and the seventh switch K7 is connected to its second end. In this way, the two-phase power supply 62 can normally output two-phase AC power to the two-phase input interface (the first phase input interface and the second phase input interface) of the multi-stage filtering circuit 40. ; When the external device 60 is a single-phase power supply 61, the controller 10 controls the first switch K1 to be turned on, the third switch K3 to be turned off, the fifth switch K5 to be turned off, and the sixth switch K6 to be always turned off, the second switch K2 is connected to its second end, the fourth switch K4 is connected to its second end, and the seventh switch K7 is connected to its second end. In this way, the single-phase power supply 61 can normally output single-phase alternating current to the single-phase input interface of the multi-stage filtering circuit 40; when the external device 60 is a load 64, the working mode is a discharge mode, which can also be divided into two situations. The controller 10 can determine which specific situation it is based on the control instruction triggered by the user receiving the external transmission.In one case, the load 64 is an in-vehicle load (for example, a low-voltage system in the vehicle, at which time the vehicle is allowed to be in a driving state), the working mode is a discharge mode, the controller 10 controls the first switch K1 to be turned off, the third switch K3 to be turned off, the fifth switch K5 to be turned off, and the sixth switch K6 to be always turned off, the second switch K2 is connected to its third end, the fourth switch K4 is connected to its second end, and the seventh switch K7 is connected to its second end, so that the power factor correction circuit 50 can reversely transmit the AC power to the in-vehicle load through the second switching module 30 and the discharge input interface of the multi-stage filter circuit 40 for discharge; In another case, the load 64 is an external load (for example, an external charger, and the vehicle is not allowed to be in a driving state at this time), and the controller 10 controls the first switch K1 to be turned on, the third switch K3 to be turned off, the fifth switch K5 to be turned off, and the sixth switch K6 to be always turned off, the second switch K2 is connected to its third end, the fourth switch K4 is connected to its second end, and the seventh switch K7 is connected to its second end. In this way, the power factor correction circuit 50 can reversely transmit the AC power to the load inside the vehicle for discharge through the second switching module 30 and the discharge input interface of the multi-stage filter circuit 40 and the first phase input interface.

[0102] It is worth noting that, since the second switch K2 is connected to the first phase interface and the first discharge interface in the form of a single-pole double-throw switch, it can be used to control the on-off state of the pre-charging circuit in the single-phase mode or the three-phase mode, and can prevent the first discharge interface and the second discharge interface from being energized after switching the power-on state, which optimizes the required number of switches and is safer; since the fourth switch K4 is connected to the first phase interface and the second phase interface in the form of a single-pole double-throw switch, it can simultaneously realize the pre-charging circuit in the three-phase mode and the two-phase mode and the large current of the first phase interface in the single-phase mode to be shunted, and better compatible with the three-phase mode and the single-phase mode. At the same time, in the single-phase mode and the three-phase mode, the X capacitors of the different levels of filtering structures will be connected in parallel on the same circuit to improve the overall X capacitor capacitance, thereby improving the overall differential mode filtering capability of the multi-stage filtering circuit 40.

[0103] Further, in this embodiment, the second switching module 30 includes: an eighth switch K8 and a ninth switch K9, the eighth switch K8 is a single-pole double-throw switch, and the second end and the third end of the single-pole double-throw switch are used for switching;

[0104] The first end of the eighth switch K8 is respectively connected to the second end of the ninth switch K9, the second end of the fifteenth capacitor C15, the second end of the sixteenth capacitor C16 and the second end of the seventeenth capacitor C17; the second end of the eighth switch K8 is connected to the fourth input end of the power factor correction circuit 50; the third end of the eighth switch K8 is respectively connected to the third input end of the power factor correction circuit 50 and the second end of the seventh inductor L7; the first end of the ninth switch K9 is respectively connected to the second end of the eighth inductor L8 and the first end of the fourteenth capacitor C14.

[0105] It should be noted that, in this embodiment, the eighth switch K8 is a single-pole double-throw switch. As above, the first end of the single-pole double-throw switch can be connected to any one of the second end or the third end.

[0106] It is easy to understand that in this embodiment, the controller 10 can change the on-off state or connection state of the eighth switch K8 and the ninth switch K9 to change the on-off state of the single-phase output interface of the multi-stage filtering circuit 40 and the connection relationship between the single-phase output interface and the third-phase output interface, thereby changing the second connection mode between the multi-stage filtering circuit 40 and the power factor correction circuit 50.

[0107] It should be noted that the second connection mode corresponds to the working mode of the power factor correction circuit 50 and the first connection mode. In a specific implementation, when the external device 60 is a three-phase power supply 63, the working mode is a three-phase mode. There are two situations. One situation is that the three-phase power supply 63 is balanced, and the controller 10 controls the eighth switch K8 to connect its second end and the ninth switch K9 to be turned off; the other situation is that the three-phase power supply 63 is unbalanced, and the controller 10 controls the eighth switch K8 to connect its second end and the ninth switch K9 to be turned on; when the external device 60 is a two-phase power supply 62, the working mode is a two-phase mode, which is divided into two situations. The controller 10 can determine which specific situation it is by detecting the voltage of the external interface. In one case, the two-phase power supply 62 is respectively connected to the first phase interface and the third phase interface of each external interface, and the controller 10 controls the eighth switch K8 to connect its third end and the ninth switch K9 to be turned on; in another case, the two-phase power supply 62 is respectively connected to the first phase interface and the second phase interface of each external interface, and this case is the same as the previous case, and the controller 10 controls the eighth switch K8 to connect its third end and the ninth switch K9 to be turned on; when the external device 60 is a single-phase power supply 61, the working mode is a single-phase mode, and the controller 10 controls the eighth switch K8 to connect its third end and the ninth switch K9 to be turned on; when the external device 60 is a load 64, the working mode is a discharge mode. There are two cases, and the controller 10 can determine which specific case it is based on the control instruction triggered by the user receiving the external transmission. In one case, the load 64 is an in-vehicle load (for example, a low-voltage system in the vehicle, and the vehicle is allowed to be in a driving state at this time), and the controller 10 controls the eighth switch K8 to connect its third end and the ninth switch K9 to be turned on; in another case, the load 64 is an external load (for example, an external charger, and the vehicle is not allowed to be in a driving state at this time), and the controller 10 controls the eighth switch K8 to connect its third end and the ninth switch K9 to be turned on.

[0108] It is worth noting that the second switch K2, the eighth switch K8 and the ninth switch K9 can all be relays with good vibration resistance, and when switching between the discharge mode and other modes, the connection states of the three switches need to be switched.

[0109] Further, in this embodiment, the power factor correction circuit 50 includes: a ninth inductor L9, a tenth inductor L10, an eleventh inductor L11 and a three-phase bridge circuit;

[0110] The first end of the ninth inductor L9 is connected to the second end of the fifth inductor L5, and the second end of the ninth inductor L9 is connected to the first phase bridge arm of the three-phase bridge circuit; the first end of the tenth inductor L10 is connected to the second end of the sixth inductor L6, and the second end of the tenth inductor L10 is connected to the second phase bridge arm of the three-phase bridge circuit; the first end of the eleventh inductor L11 is connected to the second end of the seventh inductor L7, and the second end of the eleventh inductor L11 is connected to the third phase bridge arm of the three-phase bridge circuit; the bus midpoint of the three-phase bridge circuit is connected to the second end of the eighth switch K8.

[0111] It is easy to understand that the ninth inductor L9, the tenth inductor L10 and the eleventh inductor L11 are PFC inductors, the ninth inductor L9 is respectively connected to the first phase bridge arm of the three-phase bridge circuit and the first phase output interface of the multi-stage filter circuit 40, the tenth inductor L10 is respectively connected to the second phase bridge arm of the three-phase bridge circuit and the second phase output interface of the multi-stage filter circuit 40, and the eleventh inductor L11 is respectively connected to the third phase bridge arm of the three-phase bridge circuit and the third phase output interface of the multi-stage filter circuit 40; the bus midpoint of the three-phase bridge circuit is connected to the second end of the eighth switch K8 to facilitate the transmission of single-phase alternating current.

[0112] Among them, the three-phase bridge circuit can be composed of the first power tube G1 to the sixth power tube G6, the first bus capacitor Cm1 and the second bus capacitor Cm2. The first power tube G1 and the second power tube G2 form a first phase bridge arm, the third power tube G3 and the fourth power tube G4 form a second phase bridge arm, and the fifth power tube G5 and the sixth power tube G6 form a third phase bridge arm. The positive output end of each phase bridge arm is connected to the positive pole of the bus, and the negative output end of each phase bridge arm is connected to the negative pole of the bus. The first bus capacitor Cm1 and the second bus capacitor Cm2 are also connected in series between the positive pole of the bus and the negative pole of the bus. The connection point between the first bus capacitor Cm1 and the second bus capacitor Cm2 is the bus midpoint mentioned above.

[0113] It is worth noting that in this embodiment, the eighth switch K8 is connected to the bus midpoint of the three-phase bridge circuit and the third-phase output interface in the form of a single-pole double-throw, so that the second switching module 30 can switch between the single-phase mode and the three-phase mode only by switching the connection state of the eighth switch K8, thereby reducing the number of switches and the space occupied.

[0114] In addition, to achieve the above purpose, the present application embodiment also proposes a vehicle-mounted charging and discharging method, such as Figure 4 As shown, the steps of the vehicle-mounted charging and discharging method include:

[0115] Step S10, generating a corresponding control signal based on the type of the currently connected external device;

[0116] Step S20, based on the control signal, switching the first connection mode between the multi-stage filter circuit and the external device through the first switching module, and switching the second connection mode between the multi-stage filter circuit and the power factor correction circuit through the second switching module;

[0117] Step S30, based on the first connection mode and the second connection mode, controlling the multi-stage filtering circuit to perform multi-stage filtering on the corresponding type of AC power transmitted between the external device and the power factor correction circuit, so as to cooperate with the power factor correction circuit to switch to the corresponding working mode to work;

[0118] Among them, the external device includes any one of a single-phase power supply, a two-phase power supply, a three-phase power supply and a load, and the working mode includes a single-phase mode corresponding to the single-phase power supply, a two-phase mode corresponding to the two-phase power supply, a three-phase mode corresponding to the three-phase power supply and a discharge mode corresponding to the load.

[0119] Other embodiments of the present method can be implemented by referring to the above-mentioned embodiments of the vehicle-mounted charging and discharging circuit of the present application, and should have the beneficial effects brought by the above-mentioned embodiments of the battery power management circuit, which will not be described one by one here.

[0120] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A vehicle-mounted charging and discharging circuit, characterized in that: The vehicle-mounted charging and discharging circuit includes: a first switching module, a second switching module, a multi-stage filtering circuit, a power factor correction circuit and a controller; The multi-stage filter circuit includes a plurality of input interfaces and a plurality of output interfaces corresponding to each other; the input end of the first switching module is connected to an external device including any one of a single-phase power supply, a two-phase power supply, a three-phase power supply and a load, and the output end of the first switching module is used to connect to one of the input interfaces of the multi-stage filter circuit; the output end of the second switching module is connected to the power factor correction circuit, and the input end of the second switching module is used to connect to one of the output interfaces of the multi-stage filter circuit; the controller is respectively connected to the first switching module and the second switching module; The controller is used to output corresponding control signals to the first switching module and the second switching module based on the type of the external device; The first switching module is used to switch the first connection mode between each input interface of the multi-stage filtering circuit and the external device based on the control signal; The second switching module is used to switch the second connection mode between each output interface of the multi-stage filtering circuit and the power factor correction circuit based on the control signal; The multi-stage filtering circuit is used to perform multi-stage filtering on the corresponding type of AC power transmitted between the external device and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the corresponding working mode for operation; The working modes include a single-phase mode corresponding to the single-phase power supply, a two-phase mode corresponding to the two-phase power supply, a three-phase mode corresponding to the three-phase power supply, and a discharge mode corresponding to the load.

2. The vehicle-mounted charging and discharging circuit according to claim 1, characterized in that: The external device is the single-phase power supply, the control signal includes a single-phase control signal, each of the input interfaces includes a single-phase input interface, and each of the output interfaces includes a single-phase output interface; The controller is further configured to output the single-phase control signal to the first switching module and the second switching module based on the single-phase power supply; The first switching module is further used to switch to a first connection mode in which the single-phase input interface is connected to the single-phase power supply based on the single-phase control signal; The second switching module is further used to switch to a second connection mode in which the single-phase output interface is connected to the power factor correction circuit based on the single-phase control signal; The multi-stage filtering circuit is also used to perform multi-stage filtering on the single-phase alternating current transmitted between the single-phase power supply and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the single-phase mode for operation.

3. The vehicle-mounted charging and discharging circuit according to claim 1, characterized in that: The external device is the three-phase power supply, the control signal includes a three-phase control signal, each of the input interfaces includes a three-phase input interface, and each of the output interfaces includes a three-phase output interface; The controller is further configured to output the three-phase control signal to the first switching module and the second switching module based on the three-phase power supply; The first switching module is further used to switch to a first connection mode in which the three-phase input interface is connected to the three-phase power supply based on the three-phase control signal; The second switching module is further used to switch to a second connection mode in which the three-phase output interface is connected to the power factor correction circuit based on the three-phase control signal; The multi-stage filtering circuit is also used to perform multi-stage filtering on the three-phase alternating current transmitted between the three-phase power supply and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the three-phase mode for operation.

4. The vehicle-mounted charging and discharging circuit according to claim 1, characterized in that: The external device is the two-phase power supply, the control signal includes a two-phase control signal, each of the input interfaces includes a two-phase input interface, and each of the output interfaces includes a two-phase output interface; The controller is further configured to output the two-phase control signal to the first switching module and the second switching module based on the two-phase power supply; The first switching module is further used to switch to a first connection mode in which the two-phase input interface is connected to the two-phase power supply based on the two-phase control signal; The second switching module is further used to switch to a second connection mode in which the two-phase output interface is connected to the power factor correction circuit based on the two-phase control signal; The multi-stage filtering circuit is also used to perform multi-stage filtering on the two-phase alternating current transmitted between the two-phase power supply and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the two-phase mode for operation.

5. The vehicle-mounted charging and discharging circuit according to claim 1, characterized in that: The external device is the load, the control signal includes a discharge control signal, each of the input interfaces includes an external discharge interface, and each of the output interfaces includes an internal discharge interface; The controller is further configured to output the discharge control signal to the first switching module and the second switching module based on the load; The first switching module is further used to switch to a first connection mode of connecting the external discharge interface and the load based on the discharge control signal; The second switching module is further used to switch to a second connection mode in which the internal discharge interface is connected to the power factor correction circuit based on the discharge control signal; The multi-stage filtering circuit is also used to perform multi-stage filtering on the alternating current transmitted between the load and the power factor correction circuit based on the first connection mode and the second connection mode, so as to cooperate with the power factor correction circuit to switch to the discharge mode for operation.

6. The vehicle-mounted charging and discharging circuit according to claim 1, characterized in that: The multi-stage filter circuit comprises: first to seventeenth capacitors and first to eighth inductors; The first end of the first inductor is respectively connected to the first output end of the first switching module, the discharge output end of the first switching module and the first end of the first capacitor, and the second end of the first inductor is respectively connected to the first end of the fifth inductor, the first end of the fourth capacitor and the first end of the eighth capacitor; the first end of the second inductor is respectively connected to the second output end of the first switching module and the first end of the second capacitor, and the second end of the second inductor is respectively connected to the first end of the sixth inductor, the first end of the fifth capacitor and the first end of the ninth capacitor; the first end of the third inductor is respectively connected to the third output end of the first switching module and the first end of the third capacitor, and the second end of the third inductor is respectively connected to the first end of the seventh inductor, the first end of the sixth capacitor and the first end of the tenth capacitor; the first end of the fourth inductor is respectively connected to the fourth output end of the first switching module, the second end of the first capacitor, the second end of the second capacitor and the second end of the third capacitor, and the second end of the fourth inductor is respectively connected to the first end of the eighth inductor, the first end of the seventh capacitor, the second end of the eighth capacitor, the first end of the ninth capacitor The second end of the fifth inductor is respectively connected to the first end of the eleventh capacitor, the first end of the fifteenth capacitor and the first input end of the power factor correction circuit, the second end of the sixth inductor is respectively connected to the first end of the twelfth capacitor, the first end of the sixteenth capacitor and the second input end of the power factor correction circuit, the second end of the seventh inductor is respectively connected to the first end of the thirteenth capacitor, the first end of the seventeenth capacitor, the first input end of the second switching module and the third input end of the power factor correction circuit, the second end of the eighth inductor is respectively connected to the first end of the fourteenth capacitor and the second input end of the switching module, the second end of the fifteenth capacitor, the second end of the sixteenth capacitor and the second end of the seventeenth capacitor are connected to the third input end of the switching module; the second end of the fourth capacitor, the second end of the fifth capacitor, the second end of the sixth capacitor, the second end of the seventh capacitor, the second end of the eleventh capacitor, the second end of the twelfth capacitor, the second end of the thirteenth capacitor and the second end of the fourteenth capacitor are grounded.

7. The vehicle-mounted charging and discharging circuit according to claim 6, characterized in that: The first switching module includes: first to seventh switches, first to third resistors, and eighteenth to twenty-first capacitors, the second switch, the fourth switch, and the seventh switch are single-pole double-throw switches, and the second end and the third end of the single-pole double-throw switch are used for switching; The first end of the first switch is respectively connected to the first end of the first resistor and the first phase interface, the second end of the first switch is respectively connected to the second end of the fourth switch, the first end of the second switch and the first end of the first inductor; the second end of the second switch is connected to the second end of the first resistor, and the third end of the second switch is connected to the first discharge interface; the first end of the third switch is respectively connected to the first end of the second resistor, the first end of the eighteenth band content and the second phase interface, the second end of the second switch is respectively connected to the first end of the fourth switch, the third end of the seventh switch and the first end of the second inductor; the third end of the fourth switch is connected to the second end of the second resistor; the first end of the fifth switch is respectively connected to the first end of the third resistor, the first end of the nineteenth capacitor and the third phase interface, the second end of the fifth switch is respectively connected to the second end of the sixth switch and the first end of the seventh switch; the first end of the sixth switch is connected to the second end of the third resistor; the second end of the seventh switch is connected to the first end of the third inductor; the first end of the twentieth capacitor is respectively connected to the second discharge interface, the single-phase interface, the first end of the twenty-first capacitor and the fourth inductor; the second end of the eighteenth capacitor, the second end of the nineteenth capacitor, the second end of the twentieth capacitor and the second end of the twenty-first capacitor are grounded; Among them, the first-phase interface, the second-phase interface, the third-phase interface and the single-phase interface are used to form a three-phase port, and the three-phase port is connected to the three-phase power supply; the first-phase interface, the second-phase interface and the single-phase interface or any one of the first-phase interface, the third-phase interface and the single-phase interface are used to form a two-phase port, and the two-phase port is connected to the two-phase power supply; the single-phase interface is used to form a single-phase port alone, and the single-phase port is connected to the single-phase power supply; the first discharge interface and the second discharge interface are used to form a discharge port, and the discharge port is connected to the load.

8. The vehicle-mounted charging and discharging circuit according to claim 6, characterized in that: The second switching module includes: an eighth switch and a ninth switch, the eighth switch is a single-pole double-throw switch, and the second end and the third end of the single-pole double-throw switch are used for switching; The first end of the eighth switch is respectively connected to the second end of the ninth switch, the second end of the fifteenth capacitor, the second end of the sixteenth capacitor and the second end of the seventeenth capacitor; the second end of the eighth switch is connected to the fourth input end of the power factor correction circuit; the third end of the eighth switch is respectively connected to the third input end of the power factor correction circuit and the second end of the seventh inductor; the first end of the ninth switch is respectively connected to the second end of the eighth inductor and the first end of the fourteenth capacitor.

9. The vehicle-mounted charging and discharging circuit according to claim 8, characterized in that: The power factor correction circuit comprises: a ninth inductor, a tenth inductor, an eleventh inductor and a three-phase bridge circuit; The first end of the ninth inductor is connected to the second end of the fifth inductor, and the second end of the ninth inductor is connected to the first phase bridge arm of the three-phase bridge circuit; the first end of the tenth inductor is connected to the second end of the sixth inductor, and the second end of the tenth inductor is connected to the second phase bridge arm of the three-phase bridge circuit; the first end of the eleventh inductor is connected to the second end of the seventh inductor, and the second end of the eleventh inductor is connected to the third phase bridge arm of the three-phase bridge circuit; the bus midpoint of the three-phase bridge circuit is connected to the second end of the eighth switch.

10. A vehicle-mounted charging and discharging method, characterized in that: The steps of the vehicle-mounted charging and discharging method include: Based on the type of the currently connected external device, a corresponding control signal is generated; Based on the control signal, a first connection mode between the multi-stage filter circuit and the external device is switched through a first switching module, and a second connection mode between the multi-stage filter circuit and the power factor correction circuit is switched through a second switching module; Based on the first connection mode and the second connection mode, the multi-stage filtering circuit is controlled to perform multi-stage filtering on the corresponding type of alternating current transmitted between the external device and the power factor correction circuit, so as to cooperate with the power factor correction circuit to switch to the corresponding working mode for operation; Among them, the external device includes any one of a single-phase power supply, a two-phase power supply, a three-phase power supply and a load, and the working mode includes a single-phase mode corresponding to the single-phase power supply, a two-phase mode corresponding to the two-phase power supply, a three-phase mode corresponding to the three-phase power supply and a discharge mode corresponding to the load.

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