Charging system and vehicle

Abstract

The present application belongs to the field of charging. Disclosed are a charging system and a vehicle. The charging system comprises: a non-isolated charger connected between a power grid and an energy storage apparatus, wherein at least one capacitor module is disposed between a phase line and a neutral line of the non-isolated charger; and an active leakage current suppression circuit, wherein the active leakage current suppression circuit comprises a power supply apparatus, which is used for providing power excitation for the active leakage current suppression circuit, so that the active leakage current suppression circuit generates a reverse leakage current, the difference between the amplitude of which and the amplitude of a leakage current in the charging system does not exceed a target range, and the phase of which is opposite to that of the leakage current in the charging system.

Description

Charging systems and vehicles

[0001] Cross-reference to related applications

[0002] This application is based on and claims priority to Chinese patent applications with application numbers 2024109345862, 2024109345858, 2024109442504 and 2024109400906, filed on July 12, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of charging, and more specifically, to a charging system and a vehicle. Background Technology

[0004] For non-isolated on-board chargers (OBCs) in electric vehicles, the direct connection between the AC and DC sides allows the common-mode voltage from the AC input grid to be transferred to the safety Y capacitors and distributed Y capacitors on the DC side, resulting in significant power frequency leakage current. If the leakage current exceeds the detection threshold, the external charging equipment will interrupt the charging process, thus affecting the user experience. Currently, there is a lack of effective leakage current suppression methods, and the cost of leakage current suppression is high. Summary of the Invention

[0005] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a charging system and vehicle that can effectively suppress leakage current, and has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0006] In a first aspect, this application provides a charging system, the system comprising:

[0007] A non-isolated charger is connected between the power grid and the energy storage device, and at least one capacitor module is provided between the phase line and the neutral line of the non-isolated charger.

[0008] An active leakage current suppression circuit includes a power supply device. The active leakage current suppression circuit is connected to the ground wire of the power grid and the neutral point of the first target capacitor module in the at least one capacitor module. The power supply device is used to provide power excitation to the active leakage current suppression circuit so that the active leakage current suppression circuit generates a reverse leakage current whose amplitude difference from the leakage current in the charging system does not exceed the target range and whose phase is opposite.

[0009] According to the charging system of this application, by setting an active leakage current suppression circuit with control logic independent of the original circuit, a reverse leakage current with an amplitude difference of no more than the target range and opposite phase to the leakage current in the circuit of the charging system is injected into the circuit of the charging system, so that the net leakage current on the ground line approaches 0, thereby effectively suppressing leakage current. It has a simple structure, low control complexity, low design cost, high reliability and wide applicability.

[0010] According to one embodiment of this application, the active leakage current suppression circuit further includes:

[0011] First Y capacitor;

[0012] The first transformer has its primary side connected to the power supply device, its secondary side has its first end connected to the ground wire via the first Y capacitor, and its second end connected to the neutral point of the first target capacitor module.

[0013] According to one embodiment of this application, the active leakage current suppression circuit further includes: a second transformer.

[0014] The primary side of the second transformer is used to connect to the power grid. The second transformer and the first transformer are connected in series or in parallel.

[0015] When the first transformer and the second transformer are connected in series, the third end of the secondary side of the second transformer is connected to the neutral point of the first target capacitor module, and the fourth end of the secondary side of the second transformer is connected to the second end of the secondary side of the first transformer.

[0016] When the first transformer and the second transformer are connected in parallel, the third terminal of the secondary side of the second transformer is connected to the neutral point of the second target capacitor module in the at least one capacitor module, and the fourth terminal of the secondary side of the second transformer is connected to the ground wire via the second Y capacitor.

[0017] According to one embodiment of this application, the power supply device includes an active leakage current suppression excitation circuit, which is connected to the primary side of the first transformer.

[0018] According to one embodiment of this application, the power supply device includes:

[0019] A voltage source module, the output terminal of which is connected to the primary side of the first transformer;

[0020] The first sampling module is connected to the voltage source module and is used to collect the leakage current of the ground wire and control the voltage source module based on the leakage current.

[0021] According to one embodiment of this application, the voltage source module includes:

[0022] The system comprises a first battery, a first high-frequency inverter, a first low-pass filter, and a first filter, wherein the output of the first filter is connected to the primary side of the first transformer; and the first sampling module is connected to the first high-frequency inverter.

[0023] According to one embodiment of this application, the voltage source module includes:

[0024] The system includes a rectifier circuit, a first DC / DC converter, a second high-frequency inverter, a second low-pass filter, and a second filter. The output of the second filter is connected to the primary side of the first transformer. The rectifier circuit is connected to the power grid. The first sampling module is connected to the second high-frequency inverter.

[0025] According to one embodiment of this application, the voltage source module includes:

[0026] The system comprises a second DC / DC converter, a third high-frequency inverter, a third low-pass filter, and a third filter. The output of the third filter is connected to the primary side of the first transformer. The input of the second DC / DC converter is connected to both ends of the energy storage device. The first sampling module is connected to the third high-frequency inverter.

[0027] According to one embodiment of this application, the power supply device includes:

[0028] The system comprises a third DC / DC converter, a fourth high-frequency inverter, a fourth low-pass filter, and a fourth filter. The first output terminal of the fourth filter is connected to the ground line via the first Y capacitor included in the active leakage current suppression circuit. The second output terminal of the fourth filter is connected to the neutral point of the first target capacitor module. The input terminal of the third DC / DC converter is connected to both ends of the energy storage device.

[0029] A second sampling module connected to the fourth high-frequency inverter is used to collect the leakage current of the ground wire and control the fourth high-frequency inverter based on the leakage current.

[0030] According to one embodiment of this application, the non-isolated charger includes: a first sub-filter, an H-bridge circuit, and a second sub-filter, wherein,

[0031] The input terminal of the first sub-filter is used to connect to the power grid; the output terminal of the second sub-filter is connected to the energy storage device.

[0032] The capacitor module is disposed before the input terminal of the first sub-filter, or the capacitor module is disposed between the first sub-filter and the H-bridge circuit, or the capacitor module is disposed after the output terminal of the H-bridge circuit, or the capacitor module is disposed after the second sub-filter.

[0033] According to one embodiment of this application, it also includes:

[0034] A switching module, wherein the switching module is disposed between the phase line and the neutral line between the power grid and the non-isolated charger;

[0035] The third switch is disposed between the active leakage current suppression circuit and the non-isolated charger.

[0036] Secondly, this application provides an energy storage system, which includes:

[0037] Energy storage devices;

[0038] The charging system as described in the first aspect is connected to the energy storage device.

[0039] Thirdly, this application provides a vehicle comprising:

[0040] The energy storage system as described in the second aspect.

[0041] According to the vehicle of this application, by setting an active leakage current suppression circuit with control logic independent of the original circuit, a reverse leakage current with an amplitude difference of no more than the target range and opposite phase to the leakage current in the charging system circuit is injected into the charging system circuit, so that the net leakage current on the ground line approaches 0, thereby effectively suppressing leakage current. It has a simple structure, low control complexity, low design cost, high reliability and wide applicability.

[0042] This application also proposes a charging system, an energy storage system, and a vehicle that can effectively suppress power frequency leakage current and high frequency leakage current. It has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0043] Fourthly, this application provides a charging system, which includes:

[0044] A switching transistor module, wherein the switching transistor module is connected between the power grid and the energy storage device;

[0045] An active leakage current suppression circuit is connected to the ground wire of the power grid and the switching transistor module, respectively. The active leakage current suppression circuit is used to generate a reverse leakage current whose amplitude difference from the leakage current in the charging system does not exceed the target range and whose phase is opposite.

[0046] The charging system according to this application, combined with a symmetrical switch control strategy and a switch module reuse strategy, effectively achieves power frequency leakage current suppression and high frequency leakage current suppression. Moreover, the charging system has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0047] According to one embodiment of this application, the switching transistor module includes:

[0048] A main switch module, which is connected between the power grid and the energy storage device;

[0049] An auxiliary switching module is connected between the power grid and the energy storage device; the auxiliary switching module is used to provide an excitation source for the active leakage current suppression circuit.

[0050] The main switch module and the auxiliary switch module are connected in parallel.

[0051] According to one embodiment of this application, the switching transistor module further includes:

[0052] The first inductor module is connected sequentially between the power grid and the energy storage device, along with the main switch module.

[0053] According to one embodiment of this application, the main switch module includes a first main switch module and a second main switch module connected in parallel, and the first inductor module includes a second inductor and a third inductor.

[0054] The first main switch module includes a first sub-switch and a second sub-switch connected in series, and the midpoint between the first sub-switch and the second sub-switch is connected to the first phase line of the charging system via the second inductor;

[0055] The second main switch module includes a third sub-switch and a fourth sub-switch connected in series. The midpoint between the third sub-switch and the fourth sub-switch is connected to the second phase line of the charging system via the third inductor.

[0056] According to one embodiment of this application, the inductance values ​​of the second inductor and the third inductor are the same.

[0057] According to one embodiment of this application, the main switch module adopts a symmetrical switching control strategy to suppress high-frequency leakage current in the charging system.

[0058] According to one embodiment of this application, the switching transistor module further includes:

[0059] The second inductor module and the auxiliary switch module are sequentially connected between the power grid and the energy storage device. The second inductor module and the auxiliary switch module are connected to the active leakage current suppression circuit.

[0060] According to one embodiment of this application, the auxiliary switching module includes a first auxiliary switching module and a second auxiliary switching module connected in parallel, and the second inductor module includes a fourth inductor and a fifth inductor; wherein...

[0061] The first auxiliary switch module includes a fifth sub-switch and a sixth sub-switch connected in series. The midpoint between the fifth sub-switch and the sixth sub-switch is connected to the third phase line of the charging system and the input terminal of the active leakage current suppression circuit via the fourth inductor.

[0062] The second auxiliary switch module includes a seventh sub-switch and an eighth sub-switch connected in series. The midpoint between the seventh sub-switch and the eighth sub-switch is connected to the third phase line and the input terminal of the active leakage current suppression circuit via the fifth inductor.

[0063] According to one embodiment of this application, the fourth inductor and the fifth inductor have the same inductance value, and the inductance value of the fourth inductor is twice that of the second inductor.

[0064] According to one embodiment of this application, the active leakage current suppression circuit includes:

[0065] A power supply device, wherein the input terminal of the power supply device is connected to the two input terminals of the auxiliary switching transistor module included in the switching transistor module;

[0066] A first transformer, the primary side of which is connected to the power supply device;

[0067] The first Y capacitor is connected to the ground wire via the first end of the secondary side of the first transformer, and the second end of the secondary side is connected to the phase wire and neutral wire of the charging system.

[0068] According to one embodiment of this application, the power supply device includes:

[0069] The third low-pass filter and the fourth filter, wherein the output of the fourth filter is connected to the primary side of the first transformer, and the input of the third low-pass filter is connected to the fourth inductor and the fifth inductor included in the auxiliary switching module;

[0070] The fourth switch is connected in parallel with the two input ports of the third low-pass filter, and the fourth switch is located between the two input ports of the auxiliary switch module.

[0071] According to one embodiment of this application, it also includes:

[0072] Multiple first switches are provided on multiple phase lines and neutral lines of the charging system;

[0073] Multiple fourth capacitors are provided, wherein the fourth capacitors are disposed between the target phase line and the neutral line, and one end of the fourth capacitor connected to the neutral line is also connected to the active leakage current suppression circuit.

[0074] According to one embodiment of this application, it also includes:

[0075] A common-mode inductor module is connected between the power grid and the switching transistor module, and the common-mode inductor module is disposed on the phase line of the charging system.

[0076] According to one embodiment of this application, the switching module adopts a symmetrical switching control strategy.

[0077] Fifthly, this application provides an energy storage system, comprising:

[0078] Energy storage devices;

[0079] The charging system described in the third aspect is used to connect the power grid and the energy storage device.

[0080] Sixthly, this application provides a vehicle comprising:

[0081] Energy storage systems as described in the sixth aspect.

[0082] According to the vehicle of this application, by setting a switching transistor module and an active leakage current suppression circuit, combined with a symmetrical switching control strategy and a switching transistor module multiplexing strategy, the power frequency leakage current suppression and high frequency leakage current suppression are effectively achieved. Moreover, the charging system has a simple structure, low control complexity, low design cost, high reliability and wide applicability.

[0083] This application also proposes a charging system that can suppress leakage current generated by non-isolated chargers by adding leakage current suppression measures, thereby making the charging system adaptable to various types of vehicles and charging application scenarios.

[0084] This application also proposes a vehicle.

[0085] In a seventh aspect, this application provides a charging system, comprising:

[0086] A non-isolated charger is disposed between the AC output side of the power grid and the energy storage device, and is suitable for converting the AC power provided by the power grid into DC power to charge the energy storage device.

[0087] A leakage current suppression circuit is connected to the non-isolated charger and is adapted to suppress the leakage current generated by the non-isolated charger.

[0088] According to the charging system of this application embodiment, a non-isolated charger is placed between the AC output side of the power grid and the battery pack. The non-isolated charger converts the AC power supplied by the power grid into DC power to charge the battery pack. Simultaneously, a leakage current suppression circuit is connected to the non-isolated charger to suppress leakage current from the charger. Therefore, by adding leakage current suppression measures, the leakage current generated by the non-isolated charger is suppressed, thereby making the charging system adaptable to various types of vehicles and charging application scenarios.

[0089] In addition, the charging system according to the above embodiments of this application may also have the following additional technical features:

[0090] According to one embodiment of this application, the non-isolated charger includes:

[0091] The sixth filter is adapted to filter out common-mode and differential-mode interference between the power grid and the non-isolated charger;

[0092] The seventh filter is adapted to filter out common-mode and differential-mode interference between the non-isolated charger and the energy storage device;

[0093] A DC-AC conversion module is disposed between the sixth filter and the seventh filter, and is adapted to convert the alternating current supplied by the power grid into direct current.

[0094] According to one embodiment of this application, the DC-AC conversion module includes:

[0095] The first H-bridge is adapted to transform the alternating current supplied by the power grid;

[0096] The second H-bridge is adapted to transform the alternating current supplied by the power grid;

[0097] The third switching module is connected to the first H-bridge and the second H-bridge respectively, and is adapted to enable the first H-bridge and the second H-bridge to output in series.

[0098] According to one embodiment of this application, the first H-bridge includes a first switching transistor, a second switching transistor, a first diode, and a second diode. The first switching transistor and the second switching transistor constitute a high-frequency bridge, and the first diode and the second diode constitute a power frequency bridge.

[0099] According to one embodiment of this application, the second H-bridge includes a third switch, a fourth switch, a third diode, and a fourth diode. The third switch and the fourth switch constitute a high-frequency bridge, and the third diode and the fourth diode constitute a power frequency bridge.

[0100] According to one embodiment of this application, the first H-bridge and the second H-bridge are configured as two high-frequency bridge symmetrical switches.

[0101] According to one embodiment of this application, the third switch module includes:

[0102] The fifth diode, wherein the anode of the fifth diode is connected to the first H-bridge;

[0103] The sixth diode, the cathode of which is connected to the first H-bridge;

[0104] The seventh diode, the anode of which is connected to the second H-bridge, and the cathode of which is connected to the cathode of the fifth diode;

[0105] The eighth diode has its cathode connected to the second H-bridge and its anode connected to the anode of the sixth diode.

[0106] According to one embodiment of this application, during the positive half-cycle of the AC input, the first switch and the fourth switch are controlled to switch at high frequency, the fifth diode and the eighth diode are controlled to conduct, and the sixth diode and the seventh diode are controlled to turn off. During the negative half-cycle of the AC input, the second switch and the third switch are controlled to switch at high frequency, the sixth diode and the seventh diode are controlled to conduct, and the fifth diode and the eighth diode are controlled to turn off.

[0107] According to one embodiment of this application, the non-isolated charger further includes:

[0108] The sixth inductor is disposed between the sixth filter and the first H-bridge;

[0109] The seventh inductor is disposed between the sixth filter and the second H-bridge.

[0110] According to one embodiment of this application, the non-isolated charger further includes:

[0111] The fifteenth capacitor, one end of which is connected to the sixth filter;

[0112] The ninth capacitor has one end connected to the sixth filter and the other end connected to the other end of the fifteenth capacitor to form a first midpoint.

[0113] The leakage current suppression circuit is connected to the first midpoint.

[0114] According to one embodiment of this application, the non-isolated charger further includes:

[0115] The tenth capacitor, one end of which is connected to the sixth filter;

[0116] The eleventh capacitor has one end connected to the sixth filter and the other end connected to the other end of the tenth capacitor to form a second midpoint.

[0117] The twelfth capacitor has one end connected to the cathode of the first diode and the other end connected to the anode of the second diode.

[0118] The thirteenth capacitor has one end connected to the cathode of the third diode and the other end connected to the cathode of the fourth diode.

[0119] According to one embodiment of this application, the non-isolated charger further includes:

[0120] The fourteenth capacitor, one end of which is connected to the cathode of the fifth diode;

[0121] The fifteenth capacitor has one end connected to the anode of the eighth diode and the other end connected to the other end of the fourteenth capacitor to form a third midpoint.

[0122] The second midpoint is connected to the third midpoint.

[0123] According to one embodiment of this application, the leakage current suppression circuit is an active leakage current suppression circuit, wherein the active leakage current suppression circuit includes:

[0124] Y capacitor;

[0125] An active leakage current suppression excitation circuit is suitable for providing an excitation source;

[0126] The transformer has its primary side connected to the output side of the active leakage current suppression excitation circuit, one side of the secondary side of the transformer connected to the Y capacitor, and the other side of the secondary side of the transformer connected to the non-isolated charger.

[0127] According to one embodiment of this application, the first diode is replaced with a fifth switch, the second diode is replaced with a sixth switch, the third diode is replaced with a seventh switch, the fourth diode is replaced with an eighth switch, the fifth diode is replaced with a ninth switch, the sixth diode is replaced with a tenth switch, the seventh diode is replaced with an eleventh switch, and the eighth diode is replaced with a twelfth switch.

[0128] According to one embodiment of this application, the leakage current suppression circuit further includes:

[0129] Y capacitor;

[0130] A preprocessing module, which is connected to the AC input side of the power grid, is adapted to generate the excitation source for the leakage current suppression module;

[0131] A leakage current suppression module is disposed between the preprocessing module and the non-isolated charger, and is adapted to suppress the leakage current generated by the non-isolated charger.

[0132] According to one embodiment of this application, the preprocessing module includes:

[0133] A rectifier unit, connected to the AC input side of the power grid, is adapted to convert the AC power supplied by the power grid into DC power;

[0134] A DC-DC unit, which is connected to the rectifier unit, is adapted to perform voltage amplitude conversion on the DC power;

[0135] A high-frequency inverter unit, which is connected to the DC-DC unit, is adapted to convert the direct current into high-frequency alternating current;

[0136] A filtering unit is connected to the high-frequency inverter unit and is adapted to filter the high-frequency alternating current.

[0137] According to one embodiment of this application, the leakage current suppression module includes:

[0138] A transformer, wherein the primary side of the transformer is connected to the filter unit, one side of the secondary side of the transformer is connected to the Y capacitor, and the other side of the secondary side of the transformer is connected to the non-isolated charger;

[0139] A controller, connected to the high-frequency inverter module, is adapted to acquire leakage current sampling values ​​and adjust the output voltage of the high-frequency inverter module according to the leakage current sampling values.

[0140] Eighthly, this application provides a vehicle including a battery pack and the charging system described in the embodiments of this application above.

[0141] According to the vehicle of the present application embodiment, by adopting the charging system described in the foregoing embodiments of the present application, the leakage current generated by the non-isolated charger can be suppressed by adding leakage current suppression measures, thereby making the charging system adaptable to various types of vehicles and charging application scenarios.

[0142] This application also proposes a charging system that can achieve compatibility with single-phase and three-phase inputs and reduce the capacity requirements of power devices, while reducing the leakage current generated during the operation of the charging system by adding leakage current suppression measures, thereby making the charging system adaptable to various types of vehicles and charging environments.

[0143] This application also proposes a vehicle.

[0144] Ninthly, this application provides a charging system, comprising:

[0145] An AC-DC conversion circuit is suitable for converting AC power supplied by the power grid into DC power to charge energy storage devices.

[0146] The fourth switching module is adapted to change the connection mode between the power grid and the AC-DC conversion circuit so that the charging system can operate in single-phase AC charging mode or three-phase AC charging mode.

[0147] A leakage current suppression circuit is provided to suppress the leakage current of the AC-DC conversion circuit.

[0148] According to the charging system of this application embodiment, a switching module changes the connection mode between the power grid and the AC-DC conversion circuit, enabling the charging system to operate in single-phase AC charging mode or three-phase AC charging mode. Furthermore, the AC-DC conversion circuit converts the AC power supplied by the power grid into DC power to charge the battery pack. Additionally, a leakage current suppression circuit suppresses the leakage current of the AC-DC conversion circuit. Thus, while achieving compatibility with single-phase and three-phase inputs and reducing the capacity requirements of power devices, the addition of leakage current suppression measures reduces the leakage current generated during the operation of the charging system, thereby making the charging system adaptable to various types of vehicles and charging environments.

[0149] In addition, the charging system according to the embodiments of this application may also have the following additional technical features:

[0150] According to one embodiment of this application, the fourth switch module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch, wherein phase A of the power grid is connected to the AC-DC conversion circuit through the fifth switch, phase B of the power grid is connected to the AC-DC conversion circuit through the sixth switch, phase C of the power grid is connected to the AC-DC conversion circuit through the seventh switch, and phase N of the power grid is connected to the AC-DC conversion circuit through the eighth switch.

[0151] According to one embodiment of this application, the AC-DC conversion circuit includes at least one electric drive unit, at least one inductor, and at least one switching transistor, wherein the at least one electric drive unit is connected to the fourth switching module, the at least one inductor is connected to the leakage current suppression circuit, and the at least one switching transistor is disposed between the at least one inductor and the at least one electric drive unit.

[0152] According to one embodiment of this application, the at least one electric drive unit includes a first electric drive unit and a second electric drive unit, wherein...

[0153] The first electric drive unit is disposed between the fifth switch and the energy storage device, and the first electric drive unit includes a first three-phase bridge arm;

[0154] The second electric drive unit is disposed between the sixth switch and the energy storage device, and the second electric drive unit includes a second three-phase bridge arm.

[0155] According to one embodiment of this application, the at least one switching transistor includes a fifth switching transistor, a sixth switching transistor, a seventh switching transistor, and an eighth switching transistor, wherein the fifth switching transistor and the sixth switching transistor constitute a first bridge arm, and the seventh switching transistor and the eighth switching transistor constitute a second bridge arm.

[0156] According to one embodiment of this application, the at least one inductor includes an eighth inductor and a ninth inductor, wherein the middle node of the first bridge arm is connected to the leakage current suppression circuit through the eighth inductor, and the middle node of the second bridge arm is connected to the leakage current suppression circuit through the ninth inductor.

[0157] According to one embodiment of this application, when the fifth switch and the eighth switch are configured to be in a conducting state, and the first electric drive unit is configured to be connected to the fifth switch and the second electric drive unit is configured to be connected to the eighth switch, the charging system is configured to operate in a single-phase AC charging mode.

[0158] According to one embodiment of this application, the system further includes a common-mode inductor disposed between the fourth switching module and the AC-DC conversion circuit.

[0159] According to one embodiment of this application, when the fifth switch, the sixth switch, and the seventh switch are configured to be in a conducting state, and the first electric drive unit is configured to be connected to the fifth switch and the second electric drive unit is configured to be connected to the sixth switch, the charging system is configured to operate in a three-phase AC charging mode.

[0160] According to one embodiment of this application, the at least one electric drive unit includes a third electric drive unit, wherein,

[0161] The third electric drive unit is disposed between the seventh switch and the energy storage device, and the third electric drive unit includes a third three-phase bridge arm.

[0162] According to one embodiment of this application, when the fifth switch and the eighth switch are configured to be in a conducting state, and the first electric drive unit is configured to be connected to the fifth switch and the second electric drive unit is configured to be connected to the eighth switch, the charging system is configured to operate in a single-phase AC charging mode.

[0163] According to one embodiment of this application, when the fifth switch, the sixth switch, and the seventh switch are configured to be in a conducting state, and the first electric drive unit is configured to be connected to the fifth switch, the second electric drive unit is configured to be connected to the sixth switch, and the third electric drive unit is configured to be connected to the seventh switch, the charging system is configured to operate in a three-phase AC charging mode.

[0164] According to one embodiment of this application, the leakage current suppression circuit is an active power frequency leakage current suppression circuit, which includes:

[0165] Y capacitor;

[0166] A filter, adapted to acquire an excitation source and filter the excitation source;

[0167] A transformer, wherein the primary side of the transformer is connected to the filter, one side of the secondary side of the transformer is connected to the Y capacitor, and the other side of the secondary side of the transformer is connected to the at least one electric drive unit;

[0168] A controller, connected to at least one switching transistor, is adapted to acquire a leakage current sampling value and adjust the duty cycle of the at least one switching transistor according to the leakage current sampling value.

[0169] According to one embodiment of this application, when the charging system operates in single-phase AC charging mode, the first three-phase bridge arm is configured to be connected in parallel as an A-phase half-bridge, and the second three-phase bridge arm is configured to be connected in parallel as an N-phase half-bridge. The A-phase half-bridge and the N-phase half-bridge are configured such that the upper tube of the A-phase half-bridge and the lower tube of the N-phase half-bridge are switched synchronously, and the lower tube of the A-phase half-bridge and the upper tube of the N-phase half-bridge are switched synchronously.

[0170] According to one embodiment of this application, when the charging system operates in a three-phase AC charging mode, the fifth switch, the sixth switch, the seventh switch, and the eighth switch are configured to be in an off state.

[0171] In a tenth aspect, this application provides a vehicle including a battery pack and the charging system described in the embodiments of this application above.

[0172] According to the embodiments of this application, by adopting the aforementioned charging system, the vehicle can achieve compatibility of the charging system with single-phase and three-phase inputs and reduce the capacity requirements of power devices. At the same time, by adding leakage current suppression measures, the leakage current generated during the operation of the charging system can be reduced, thereby making the charging system adaptable to various types of vehicles and charging environments.

[0173] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0174] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0175] Figure 1 is a schematic diagram of one of the charging systems provided in an embodiment of this application;

[0176] Figure 2 is a second schematic diagram of the charging system provided in an embodiment of this application;

[0177] Figure 3 is a third schematic diagram of the charging system provided in the embodiment of this application;

[0178] Figure 4 is a fourth structural schematic diagram of the charging system provided in the embodiment of this application;

[0179] Figure 5 is a fifth schematic diagram of the charging system provided in the embodiment of this application;

[0180] Figure 6 is a sixth schematic diagram of the charging system provided in the embodiment of this application;

[0181] Figure 7 is the seventh structural schematic diagram of the charging system provided in the embodiment of this application;

[0182] Figure 8 is a schematic diagram of the charging system provided in an embodiment of this application;

[0183] Figure 9 is a structural schematic diagram of the charging system provided in an embodiment of this application;

[0184] Figure 10 is a schematic diagram of the charging system provided in an embodiment of this application;

[0185] Figure 11 is an eleventh schematic diagram of the charging system provided in an embodiment of this application;

[0186] Figure 12 is a schematic diagram of the charging system provided in an embodiment of this application;

[0187] Figure 13 is a block diagram of one of the charging systems provided in the embodiments of this application;

[0188] Figure 14 is one of the electrical schematic diagrams of the charging system provided in the embodiment of this application;

[0189] Figure 15 is a second electrical schematic diagram of the charging system provided in an embodiment of this application;

[0190] Figure 16 is the third electrical schematic diagram of the charging system provided in the embodiment of this application;

[0191] Figure 17 is the fourth electrical schematic diagram of the charging system provided in the embodiment of this application;

[0192] Figure 18 is a second block diagram of the charging system provided in an embodiment of this application;

[0193] Figure 19 is the fifth electrical schematic diagram of the charging system provided in the embodiment of this application;

[0194] Figure 20 is a block diagram of the vehicle provided in an embodiment of this application;

[0195] Figure 21 is a third block diagram of the charging system provided in an embodiment of this application;

[0196] Figure 22 is a fourth block diagram of the charging system provided in an embodiment of this application;

[0197] Figure 23 is a fifth block diagram of the charging system provided in the embodiments of this application;

[0198] Figure 24 is the sixth electrical schematic diagram of the charging system provided in the embodiment of this application;

[0199] Figure 25 is a sixth block diagram of the charging system provided in the embodiments of this application;

[0200] Figure 26 is the seventh electrical schematic diagram of the charging system provided in the embodiments of this application. Detailed Implementation

[0201] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0202] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0203] The charging system and vehicle provided in this application will be described in detail below with reference to the accompanying drawings, through specific embodiments and application scenarios.

[0204] As shown in Figure 1, the charging system includes a non-isolated charger 20 and an active leakage current suppression circuit 40.

[0205] The non-isolated charger 20 is connected between the power grid 10 and the energy storage device 200 to realize the AC to DC conversion.

[0206] The power grid 10 may include a single-phase input power grid or a three-phase input power grid.

[0207] The energy storage device 200 may include various types of energy storage batteries, etc.

[0208] In some embodiments, a first switch module 50 can be provided in each phase line and the neutral line of the three-phase input power grid to control the on / off state of the corresponding branch, thereby realizing the switching between single-phase charging mode and three-phase charging mode.

[0209] Understandably, the charging system may include a charging station and a vehicle, wherein the charging station is supplied with electrical energy input from the AC source of the power grid 10, and the vehicle includes a non-isolated charger 20, which converts AC to DC to charge the energy storage device 200.

[0210] During vehicle charging, the common-mode voltage contained in the single-phase AC input of the grid 10 will charge and discharge the safety Y capacitors and the distributed Y capacitors of the high-voltage devices to the vehicle ground, thereby forming a common-mode current, i.e., leakage current Ileak. This leakage current returns to the input side of the grid 10 through the ground wire, which will cause electromagnetic interference problems. If it exceeds the leakage current design threshold of the external charging equipment, it will cause charging to stop, reducing the user's charging experience. If the ground wire fails, it may even threaten personal safety.

[0211] As shown in Figure 2, the non-isolated charger 20 includes at least one capacitor module.

[0212] The capacitor module is positioned between the phase line and the neutral line.

[0213] In some embodiments, the capacitor module may include a first sub-capacitor and a second sub-capacitor connected in series.

[0214] The first sub-capacitor and the second sub-capacitor are connected in series and set between the L line and N line of the power grid 10, as shown in C1 and C2 in Figure 5, C3 and C4 in Figure 5, and C5 and C6 in Figure 5.

[0215] The neutral point of the capacitor module is the midpoint of the potential between the first sub-capacitor and the second sub-capacitor.

[0216] The number of capacitor modules can be one or more.

[0217] As shown in Figure 3, in some embodiments, the non-isolated charger 20 may include a first sub-filter 21, an H-bridge circuit 22, and a second sub-filter 23 connected in series.

[0218] In this embodiment, the input terminal of the first sub-filter 21 is connected to the phase line of the power grid 10 for accessing the alternating current of the power grid 10.

[0219] In some embodiments, the first sub-filter 21 and the second sub-filter 23 may include π-type filters or other types of EMI filters, etc., which are not limited in this application.

[0220] The input terminal of the first sub-filter 21 is used to connect to the AC power of the power grid 10.

[0221] The output of the second sub-filter 23 is connected to the energy storage device 200.

[0222] In some embodiments, the capacitor module may be disposed before the input terminal of the first sub-filter 21, between the output terminal of the first sub-filter 21 and the input terminal of the H-bridge circuit 22, after the input terminal of the H-bridge circuit 22, or after the output terminal of the second sub-filter 23. This application does not limit this.

[0223] The active leakage current suppression circuit 40 includes: a power supply device.

[0224] The power supply device is used to provide power excitation to the active leakage current suppression circuit 40 so that the active leakage current suppression circuit 40 generates a reverse leakage current whose amplitude difference from the leakage current in the circuit of the charging system does not exceed the target range and whose phase is opposite, thereby injecting the reverse leakage current into the charging system.

[0225] The target range is a relatively small range, which can be customized by the user.

[0226] The degree of difference can be a difference or a ratio, etc.

[0227] Understandably, if the difference does not exceed the target range, the amplitude of the reverse leakage current can be approximated as the same as or basically the same as the amplitude of the leakage current in the charging system circuit.

[0228] In some embodiments, the active leakage current suppression circuit 40 is connected to the ground wire of the power grid 10 and the neutral point of the first target capacitor module in at least one capacitor module.

[0229] The first target capacitor module can be any one of at least one capacitor module.

[0230] The power supply device is used to provide power excitation to the active leakage current suppression circuit 40 so that the active leakage current suppression circuit 40 generates a reverse leakage current whose amplitude difference with the leakage current in the circuit of the charging system does not exceed the target range and whose phase is opposite. The reverse leakage current is injected into the circuit of the charging system through the first target capacitor module, so that the net leakage current on the ground line approaches 0, thereby realizing leakage current suppression.

[0231] It should be noted that, depending on the type of power supply device, the active leakage current suppression circuit 40 can be configured with different structures. For example, the active leakage current suppression excitation circuit can be connected in series with the first Y capacitor CY1 through a transformer to achieve active leakage current suppression; or, the power supply device and the first Y capacitor CY1 can be directly connected in series to achieve active leakage current suppression. This application does not limit the scope of the application.

[0232] The specific configuration of the active leakage current suppression circuit 40 will be described in the following embodiments, and will not be repeated here.

[0233] During the research and development process, the inventors discovered that in related technologies, there are methods such as setting up DC blocking capacitors to suppress leakage current, adjusting the PFC duty cycle based on AC input, DC bus voltage and ground leakage current sampling values ​​to reduce low-frequency leakage current, or matching the Y capacitor parameters of the whole vehicle to set up a passive power frequency transformer leakage current suppression circuit to reduce low-frequency leakage current. However, these methods have problems such as low flexibility, high design difficulty, high circuit complexity, high design cost and poor suppression effect.

[0234] In this application, the active leakage current suppression method can eliminate the influence of Y capacitance value drift, thereby matching different vehicle designs and adapting to various working environment conditions, and has high flexibility; the requirements for new circuit components are low, and the Y capacitance value required for the suppression circuit is low, which can meet the application scenarios of on-board chargers with high withstand voltage requirements; in addition, the control logic of the active leakage current suppression circuit 40 is independent of the control logic of the original circuit, with low control complexity, and does not affect the original electrical performance of the circuit.

[0235] According to the charging system provided in the embodiments of this application, an active leakage current suppression circuit 40 with control logic independent of the original circuit is set up to generate a reverse leakage current that is opposite in phase to the leakage current in the circuit of the charging system, with the difference in amplitude not exceeding the target range. This makes the net leakage current on the ground line approach 0, thereby effectively suppressing leakage current. The system has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0236] As shown in Figure 2, in some embodiments, the active leakage current suppression circuit 40 may include: a first Y capacitor CY1 and a first transformer T1.

[0237] In this embodiment, the power supply device is a device for providing excitation.

[0238] The primary side of the first transformer T1 is connected to the power supply device, and the first end of the secondary side of the first transformer T1 is connected to the ground wire through the first Y capacitor CY1 to provide a voltage reference.

[0239] The second end of the secondary side of the first transformer T1 is connected to the neutral point of the first target capacitor module, injecting reverse leakage current into the circuit, so that the net leakage current on the ground line approaches 0.

[0240] In actual operation, the power supply device generates an excitation, which generates a reverse leakage current through the first transformer T1. The difference in amplitude between the reverse leakage current and the sampled leakage current does not exceed the target range and the reverse leakage current is opposite in phase. This reverse leakage current is injected into the circuit of the charging system through the neutral point of the capacitor module, so that the net leakage current on the ground line approaches 0, thereby achieving leakage current suppression.

[0241] The first target capacitor module can be any capacitor module from at least one capacitor module.

[0242] For example, as shown in Figure 2, the second end of the secondary side of the first transformer T1 can be connected to the neutral point of the capacitor module located before the input of the first sub-filter 21; or as shown in Figure 3, the second end of the secondary side of the first transformer T1 can be connected to the neutral point of the capacitor module located between the output of the first sub-filter 21 and the input of the H-bridge circuit 22; or as shown in Figure 4, the second end of the secondary side of the first transformer T1 can be connected to the neutral point of the capacitor module located after the input of the H-bridge circuit 22 to inject reverse leakage current.

[0243] In some embodiments, the active leakage current suppression circuit 40 may further include a second transformer T2.

[0244] In this embodiment, the second transformer T2 can be connected in series with the first transformer T1, or it can be connected in parallel with the first transformer T1.

[0245] As shown in Figure 4, the primary side of the second transformer T2 is located between the L line and N line of the power grid 10, and is used to connect to the AC power of the power grid 10.

[0246] The second transformer T2 is used to generate most of the power frequency reverse leakage current.

[0247] The power supply unit and the first transformer T1 are used to compensate for the leakage current changes caused by the fluctuation of the vehicle's Y capacitor and the voltage fluctuation of the power grid 10, so as to achieve leakage current suppression.

[0248] Referring again to Figure 4, when the first transformer T1 and the second transformer T2 are connected in series, the third end of the secondary side of the second transformer T2 is connected to the neutral point of the first target capacitor module, and the fourth end of the secondary side of the second transformer T2 is connected to the second end of the secondary side of the first transformer T1.

[0249] The reverse leakage current is injected into the main circuit through the neutral point of the first target capacitor module, which is connected to the third terminal of the secondary side of the second transformer T2, thereby suppressing the leakage current.

[0250] As shown in Figure 5, when the second transformer T2 and the first transformer T1 are connected in parallel, the third end of the secondary side of the second transformer T2 is connected to the neutral point of the second target capacitor module in at least one capacitor module, and the fourth end of the secondary side of the second transformer T2 is connected to the ground wire through the second Y capacitor CY2.

[0251] The second target capacitor module can be a different capacitor module from the first target capacitor module among multiple capacitor modules.

[0252] For example, the third terminal of the second transformer T2 is connected to the neutral point of the capacitor module located before the first sub-filter 21, and the fourth terminal is connected to the ground wire of the power grid 10 via the second Y capacitor CY2; the second terminal of the first transformer T1 is connected to the neutral point of the capacitor module located at the input and / or output terminals of the H-bridge, and the first terminal is connected to the ground wire of the power grid 10 via the first Y capacitor CY1.

[0253] According to the charging system provided in the embodiments of this application, by setting a second transformer, the leakage current can be further precisely suppressed.

[0254] The structure of the power supply device will be described in detail below.

[0255] Referring again to Figure 4, in some embodiments, the power supply device may include an active leakage current suppression excitation circuit.

[0256] In this embodiment, the active leakage current suppression excitation circuit is connected to the primary side of the first transformer T1 to provide an excitation source.

[0257] In some embodiments, the power supply device may include a voltage source module and a first sampling module.

[0258] In this embodiment, the voltage source module is used to provide voltage input and perform voltage conversion, etc.

[0259] The output terminal of the voltage source module is connected to the primary side of the first transformer.

[0260] The first sampling module is connected to the voltage source module and is used to collect the leakage current of the ground wire and control the voltage source module based on the leakage current sampling value.

[0261] The voltage input sources of the voltage source module may include: AC input from the power grid 10, low-voltage battery input, and voltage input from the energy storage device 200.

[0262] The specific structure of a voltage source module may vary depending on the source of the voltage input. The structure of a voltage source module is described below.

[0263] As shown in Figure 6, in some embodiments, the voltage source module may include: a first battery, a first high-frequency inverter, a first low-pass filter, and a first filter.

[0264] In this embodiment, the first battery is a low-voltage battery, such as a 12V or 13.8V storage battery.

[0265] The first filter may include, but is not limited to, π-type filters or other types of EMI filters.

[0266] The first high-frequency inverter is used to convert low-voltage direct current into high-frequency alternating current.

[0267] The first low-pass filter is used to filter the voltage component at the switching frequency and retain the relatively low-frequency voltage component.

[0268] Referring to Figure 6, the first battery, high-frequency inverter, low-pass filter and first filter are connected in series, and the output of the first filter is connected to the primary side of the first transformer T1.

[0269] The connection method of the secondary side of the first transformer T1 is similar to that in the above embodiment. For example, it can be connected between the first Y capacitor CY1 and the first target capacitor module to generate reverse leakage current; or it can be connected in series with the second transformer T2, etc. This application will not elaborate on this.

[0270] The first sampling module is connected to the first high-frequency inverter and is used to collect the leakage current of the ground wire. Based on the sampled value, it controls the duty cycle of the first high-frequency inverter module, thereby adjusting the frequency and amplitude of the high-frequency AC voltage, generating the corresponding reverse leakage current, and achieving precise suppression of leakage current.

[0271] In some embodiments, the first sampling module may further include a controller and a leakage current sampling module, wherein the leakage current sampling module is disposed on the ground wire of the power grid 10, the controller is connected to the high-frequency inverter and the leakage current sampling module respectively, the controller controls the leakage current sampling module to sample the leakage current on the ground wire, and determines the duty cycle of the first high-frequency inverter through feedback control, thereby adjusting the frequency and amplitude of the high-frequency AC voltage.

[0272] As shown in Figure 7, in some embodiments, the voltage source module may include: a rectifier circuit, a first DC / DC converter, a second high-frequency inverter, a second low-pass filter, and a second filter.

[0273] In this embodiment, the rectifier circuit, the first DC / DC converter, the second high-frequency inverter, the second low-pass filter, and the second filter are connected in sequence, and the input terminal of the rectifier circuit is used to connect to the AC power grid 10.

[0274] The rectifier circuit is used to convert the AC voltage of the power grid 10 into a high-voltage DC voltage.

[0275] The first type of DC / DC converter, also known as a DC-to-DC converter, is used to convert high-voltage DC power into low-voltage DC power.

[0276] The second high-frequency inverter is used to convert low-voltage DC power into high-frequency AC power.

[0277] The second low-pass filter is used to filter the voltage component at the switching frequency in high-frequency AC and retain the relatively low-frequency voltage component.

[0278] The second filter may include, but is not limited to, π-type filters or other types of EMI filters.

[0279] The output of the second filter is connected to the primary side of the first transformer T1.

[0280] The first sampling module is used to collect the leakage current of the ground wire and control the high-frequency inverter based on the leakage current sampling value.

[0281] The connection method and control logic of the first sampling module have been described in the above embodiments and will not be repeated here.

[0282] As shown in Figure 8, in some embodiments, the voltage source module may include: a second DC / DC converter, a third high-frequency inverter, a third low-pass filter, and a third filter.

[0283] In this embodiment, the second DC / DC converter, the third high-frequency inverter, the third low-pass filter, and the third filter are connected in sequence, and the input terminal of the second DC / DC converter is connected to both ends of the energy storage device 200. The high-voltage DC power output by the energy storage device 200 serves as the excitation source for the active leakage current suppression circuit 40.

[0284] The second DC / DC converter is used to convert the high-voltage DC power provided by the energy storage device 200 into low-voltage DC power.

[0285] In some embodiments, the third filter may include, but is not limited to, a π-type filter or other types of EMI filters.

[0286] The connection methods and specific execution logic of the third high-frequency inverter, the third low-pass filter, the third filter, and the first sampling module are similar to those in the above embodiments, and will not be repeated here.

[0287] As shown in Figure 9, in some embodiments, the power supply device may further include: a third DC / DC converter, a fourth high-frequency inverter, a fourth low-pass filter, a fourth filter, and a second sampling module.

[0288] In this embodiment, the input terminal of the third DC / DC converter is connected to both ends of the energy storage device 200, and the high-voltage DC power output by the energy storage device 200 serves as the excitation source of the active leakage current suppression circuit 40.

[0289] The third DC / DC converter, the fourth high-frequency inverter, the fourth low-pass filter, and the fourth filter are connected in sequence.

[0290] In some embodiments, the fourth filter may include, but is not limited to, a π-type filter or other types of EMI filters.

[0291] The first output terminal of the fourth filter is connected to the ground line via the first Y capacitor CY1, and the second output terminal of the fourth filter is connected to the neutral point of the first target capacitor module.

[0292] For example, the second output terminal of the fourth filter can be connected to the neutral point of the capacitor module before the first sub-filter 21, or it can be connected to the neutral point of the capacitor modules before and after the H-bridge circuit 22.

[0293] The second sampling module is connected to the fourth high-frequency inverter and controls the fourth high-frequency inverter based on the ground leakage current sampling value.

[0294] The second sampling module may also include a controller and a leakage current sampling module. The specific settings are similar to those of the first sampling module, and will not be described in detail here.

[0295] According to the charging system provided in the embodiments of this application, reverse leakage current injection can be achieved directly through the first Y capacitor without the need for a transformer, further reducing system components and lowering the cost of leakage current suppression circuit.

[0296] As shown in Figures 1 and 10, in some embodiments, the system may further include a first switch module 50 and a third switch K61.

[0297] In this embodiment, the switching module includes: a plurality of first switches, a second switch, and a plurality of fourth capacitors.

[0298] In the power grid 10, at least one first switch is provided in each phase line and the neutral line. When the first switch is closed, the branch line provided by the first switch is connected.

[0299] One end of the second switch is located between the first switch corresponding to the neutral line of the power grid 10 and the N-phase port of the power grid 10, and the other end of the second switch is located between the first switch corresponding to any phase line of the power grid 10 and the non-isolated charger 20.

[0300] The fourth capacitor is placed between the target phase line and the neutral line.

[0301] The target phase line includes at least one of phase lines A, B, and C.

[0302] The third switch K61 is located between the active leakage current suppression circuit 40 and the non-isolated charger 20.

[0303] Referring again to Figure 10, the third switch K61 can be connected between the second end of the secondary side of the first transformer T1 and the fourth capacitor.

[0304] Referring again to Figure 10, for example, in the case where the active leakage current suppression circuit 40 includes a first transformer T1, a power supply device and a first Y capacitor CY1, the first end of the secondary side of the first transformer T1 is connected to the ground wire via the first Y capacitor CY1, and the second end of the secondary side is connected to the first end of each fourth capacitor via the third switch K61.

[0305] The power supply device can be any form, such as the active leakage current suppression excitation circuit proposed in the above embodiments, the first battery, the AC power of the power grid 10, or the output of the energy storage device 200.

[0306] In other embodiments, the active leakage current suppression circuit 40 may also be the circuit structure shown in FIG9, which is not limited herein.

[0307] For example, continuing to refer to Figure 10, the first switch may include: switch K51, switch K52, switch K53 and switch K54, etc.

[0308] When switch K51, second switch K55 and third switch K61 are closed, the circuit operates in single-phase input mode. At this time, the active leakage current suppression circuit 40 is connected to suppress power frequency and high frequency leakage current in single-phase input mode.

[0309] When switches K51, K52, K53, and K54 are closed, the circuit operates in three-phase input mode. Through control strategy optimization, battery voltage fluctuations to ground can be suppressed. The active leakage current suppression circuit 40 does not need to operate and is therefore not connected. High-frequency leakage current can be suppressed by the common-mode inductors in the first sub-filter 21 and the second sub-filter 23 included in the non-isolated charger 20.

[0310] According to the charging system provided in the embodiments of this application, by setting multiple switches, compatibility with single-phase input and three-phase input can be achieved, further improving the applicable scenarios and scope of the charging system.

[0311] This application also provides an energy storage system.

[0312] The energy storage system includes an energy storage device 200 and a charging system as described in any of the above embodiments.

[0313] In this embodiment, the charging system is connected to the energy storage device 200.

[0314] According to the energy storage system provided in the embodiments of this application, an active leakage current suppression circuit 40 with control logic independent of the original circuit is set up to generate a reverse leakage current that is opposite in phase to the leakage current in the charging system circuit, with the difference in amplitude not exceeding the target range. This makes the net leakage current on the ground line approach 0, thereby effectively suppressing leakage current. The system has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0315] This application also provides a vehicle.

[0316] The vehicle includes the energy storage system described in any of the above embodiments.

[0317] In this embodiment, the energy storage system is installed in the vehicle body and is used to supply power to the vehicle.

[0318] According to the vehicle provided in the embodiments of this application, by setting an active leakage current suppression circuit 40 with control logic independent of the original circuit, a reverse leakage current with an amplitude difference of no more than the target range and opposite phase to the leakage current in the charging system circuit is injected into the charging system circuit, so that the net leakage current on the ground line approaches 0, thereby effectively suppressing leakage current. It has a simple structure, low control complexity, low design cost, high reliability and wide applicability.

[0319] For non-isolated on-board chargers (OBCs) in electric vehicles, the direct connection between the AC and DC sides causes common-mode voltages from the AC input grid and high-frequency switches to charge and discharge the safety-compliant Y capacitors and distributed Y capacitors in the circuit, generating common-mode current, or leakage current. If the leakage current exceeds the detection threshold, the external charging equipment will interrupt the charging process, thus affecting the user experience. Currently, there is a lack of effective leakage current suppression methods, and the cost of leakage current suppression is relatively high.

[0320] As shown in Figure 11, the charging system includes a switching transistor module and an active leakage current suppression circuit 40.

[0321] The switching transistor module can be installed in a non-isolated charger.

[0322] The non-isolated charger is connected between the power grid 10 and the energy storage device 200 to achieve AC to DC conversion.

[0323] The energy storage device 200 may include various types of energy storage batteries, etc.

[0324] The power grid 10 may include a single-phase input power grid or a three-phase input power grid.

[0325] In some embodiments, a second switch module 110 can be provided in each phase line and the neutral line of the three-phase input power grid to control the on / off state of the corresponding branch, thereby realizing the switching between single-phase charging mode and three-phase charging mode.

[0326] As shown in Figure 11, in some embodiments, the charging system may further include a second switch module 110, which may be disposed on each phase line and the neutral line between the non-isolated charger and the power grid 10.

[0327] It is understood that the charging system may include a charging pile and a vehicle. The charging pile is supplied with electrical energy by the AC power source of the power grid, and the vehicle includes a non-isolated charger. The non-isolated charger is connected between the power grid 10 and the energy storage device 200. The AC power is converted to DC power to charge the energy storage device 200.

[0328] The charging system may include multiple fifth filters.

[0329] The switching module is located between the two fifth filters.

[0330] The fifth filter can be an EMI filter.

[0331] Referring again to FIG11, in some embodiments, the charging system may further include a common-mode inductor module 130.

[0332] In this embodiment, the common-mode inductor module 130 may be disposed in a non-isolated charger.

[0333] The common mode inductor module 130 is connected between the power grid 10 and the switching transistor module, and the common mode inductor module 130 is located on the phase line of the charging system.

[0334] In some embodiments, when the charging system is in a three-phase AC charging mode, the common-mode inductor module 130 may include a plurality of sub-common-mode inductors L4.

[0335] In this embodiment, as shown in FIG12, at least one sub-common mode inductor L4 is respectively provided on each phase line.

[0336] Taking the fifth filter as an EMI filter as an example, multiple fifth filters may include a first EMI filter 201 and a second EMI filter 601, with the second EMI filter 601 used to connect to the energy storage device 200.

[0337] The first EMI filter 201 is connected to the second EMI filter 601 via a sub-common mode inductor L4 located on each phase line and a switching transistor module connected to the sub-common mode inductor L4.

[0338] When the charging system is in three-phase AC charging mode, the high-frequency leakage current generated by the charging system can be suppressed by the common-mode inductor module 130.

[0339] The switching module is connected between the power grid 10 and the energy storage device 200.

[0340] In some embodiments, the switching module employs a symmetrical switching strategy to suppress high-frequency leakage current generated in single-phase AC charging mode.

[0341] The active leakage current suppression circuit 40 is connected to the ground wire PE of the power grid 10 and the switching transistor module, respectively.

[0342] When the active leakage current suppression circuit 40 is in operation, it generates a reverse leakage current whose amplitude difference from the leakage current in the charging system circuit does not exceed the target range and whose phase is opposite, and injects it into the charging system circuit, so that the net leakage current on the ground line approaches 0, thereby achieving leakage current suppression.

[0343] The target range is a relatively small range, which can be customized by the user.

[0344] The degree of difference can be a difference or a ratio, etc.

[0345] Understandably, if the difference does not exceed the target range, the amplitude of the reverse leakage current can be approximated as the same as or basically the same as the amplitude of the leakage current in the charging system circuit.

[0346] The second switch module 110 is used to switch the operating mode of the power grid 10.

[0347] The operating modes include single-phase AC charging mode or three-phase AC charging mode.

[0348] In some embodiments, the second switching module 110 can also control the operating state of the active leakage current suppression circuit 40.

[0349] The work status includes whether you are working or not.

[0350] When the charging system is in single-phase AC charging mode, the active leakage current suppression circuit 40 operates.

[0351] When the charging system is in three-phase AC charging mode, the active leakage current suppression circuit 40 does not work.

[0352] It should be noted that, in actual operation, when the charging system is in single-phase AC charging mode, the active leakage current suppression circuit 40 operates to generate a reverse leakage current whose amplitude difference from the leakage current Ileak in the charging system circuit does not exceed the target range and whose phase is opposite, thereby achieving power frequency leakage current suppression.

[0353] The switching module adopts a symmetrical switching control strategy to achieve a negative switching trend of the DC bus negative terminal potential with the same amplitude when the DC bus positive terminal potential jumps, thereby suppressing the generated high-frequency leakage current.

[0354] When the charging system is in three-phase AC charging mode, there is no need to suppress the power frequency leakage current, and the active leakage current suppression circuit 40 can be disabled; the high-frequency leakage current generated can be suppressed by the common mode inductor module 130.

[0355] The charging system provided in the embodiments of this application effectively achieves power frequency leakage current suppression and high frequency leakage current suppression by setting a switching transistor module and an active leakage current suppression circuit, combined with a symmetrical switching control strategy and a switching transistor module multiplexing strategy. Moreover, the charging system has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0356] Referring again to Figure 11, in some embodiments, the switching module includes a main switching module 150 and an auxiliary switching module 190.

[0357] In this embodiment, the main switch module 150 is connected between the power grid 10 and the energy storage device 200.

[0358] The auxiliary switching module 190 is connected between the power grid 10 and the energy storage device 200; the auxiliary switching module 190 is used to provide an excitation source for the active leakage current suppression circuit 40.

[0359] Referring again to Figure 11, in some embodiments, the switching module may further include a first inductor module 140.

[0360] In this embodiment, the first inductor module 140 and the main switch module 150 are sequentially connected between the power grid 10 and the energy storage device 200.

[0361] In some embodiments, the main switch module 150 employs a symmetrical switching control strategy to suppress high-frequency leakage current in the charging system during single-phase AC charging mode.

[0362] The second inductor module 180 and the auxiliary switch module 190 are connected sequentially between the power grid 10 and the energy storage device 200.

[0363] In some embodiments, the switching module may further include a second inductor module 180.

[0364] In this embodiment, the second inductor module 180 and the auxiliary switch module 190 are sequentially connected between the power grid 10 and the energy storage device 200.

[0365] The auxiliary switching module 190 is used to provide an excitation source for the active leakage current suppression circuit 40 in single-phase AC charging mode.

[0366] In actual operation, when the charging system is in single-phase AC charging mode, the main switch module 150 adopts a symmetrical switching control strategy to ensure that when the DC bus positive potential jumps, the DC bus negative potential can simultaneously jump in the opposite direction with the same amplitude, thereby achieving the effect of canceling high-frequency leakage current and suppressing the leakage current generated in single-phase AC charging.

[0367] When the charging system is in three-phase AC charging mode, the main switch module 150 and the auxiliary switch module 190 are respectively connected to the corresponding phase lines to charge the energy storage device 200.

[0368] According to the charging system provided in the embodiments of this application, by setting the main switch module 150 and the auxiliary switch module 190, the switch modules can be reused to enable each switch module to perform different functions in different charging modes. Thus, in both single-phase and multi-phase charging modes, power frequency leakage current suppression and high-frequency leakage current suppression can be effectively achieved.

[0369] As shown in Figure 12, in some embodiments, the main switch module 150 may include a first main switch module and a second main switch module connected in parallel, and the first inductor module 140 includes a second inductor L5 and a third inductor L6.

[0370] In this embodiment, the first main switch module forms one bridge arm, and the second main switch module forms another bridge arm.

[0371] The first main switch module includes a first sub-switch S1 and a second sub-switch S2 connected in series. The midpoint between the first sub-switch S1 and the second sub-switch S2 is connected to the first phase line of the charging system via a second inductor L5.

[0372] The second main switch module includes a third sub-switch S3 and a fourth sub-switch S4 connected in series. The midpoint between the third sub-switch S3 and the fourth sub-switch S4 is connected to the second phase line of the charging system via a third inductor L6.

[0373] In some embodiments, the second inductor L5 and the third inductor L6 have the same inductance value to achieve symmetry.

[0374] In single-phase AC charging mode, the first sub-switch S1 and the fourth sub-switch S4 switch synchronously, and the second sub-switch S2 and the third sub-switch S3 switch synchronously to achieve a symmetrical switching control strategy.

[0375] The following explanation uses the first phase line as phase A and the second phase line as phase B as an example.

[0376] When the charging system is in single-phase AC charging mode, the first main switch module acts as the L-phase bridge arm and the second main switch module acts as the N-phase bridge arm to charge the energy storage device 200.

[0377] At the same time, the first main switch module and the second main switch module are switched symmetrically to suppress the high-frequency leakage current generated during the operation of the circuit.

[0378] When the charging system is in three-phase AC charging mode, the first main switch module acts as the A-phase bridge arm and the second main switch module acts as the B-phase bridge arm to charge the energy storage device 200.

[0379] Referring again to FIG12, in some embodiments, the auxiliary switch module 190 may include a first auxiliary switch module and a second auxiliary switch module connected in parallel, and the second inductor module 180 includes a fourth inductor L7 and a fifth inductor L8.

[0380] In this embodiment, the first auxiliary switch module forms one bridge arm, and the second auxiliary switch module forms the other bridge arm.

[0381] The first auxiliary switch module includes a fifth sub-switch S5 and a sixth sub-switch S6 connected in series. The midpoint between the fifth sub-switch S5 and the sixth sub-switch S6 is connected to the third phase line of the charging system via a fourth inductor L7.

[0382] In some embodiments, the midpoint between the fifth sub-switch S5 and the sixth sub-switch S6 can also be connected to the input terminal of the active leakage current suppression circuit 40 via the fourth inductor L7.

[0383] The second auxiliary switch module includes a seventh sub-switch S7 and an eighth sub-switch S8 connected in series. The midpoint between the seventh sub-switch S7 and the eighth sub-switch S8 is connected to the third phase line of the charging system via the fifth inductor L8.

[0384] In some embodiments, the midpoint between the seventh sub-switch S7 and the eighth sub-switch S8 is also connected to the input terminal of the active leakage current suppression circuit 40 via the fifth inductor L8.

[0385] In some embodiments, the fourth inductor L7 and the fifth inductor L8 have the same inductance value, and the inductance value of the fourth inductor L7 is twice that of the second inductor L5.

[0386] When the charging system is in single-phase AC charging mode, the high-frequency inverter function is realized through the first auxiliary switch module and the second auxiliary switch module, which provides the excitation source input for the active leakage current suppression circuit 40, as shown in Figure 12. In actual execution, a controller and a leakage current sampling module electrically connected to the controller can be set. The controller controls the leakage current sampling module to sample the leakage current Ileak on the ground line.

[0387] When the charging system is in three-phase AC charging mode, the first auxiliary switch module and the second auxiliary switch module work in parallel as the C-phase bridge arm to charge the energy storage device 200.

[0388] According to the charging system provided in the embodiments of this application, by setting a first auxiliary switch module and a second auxiliary switch module, the auxiliary switch tube can be used as a high-frequency inverter module in the single-phase AC charging mode to provide an excitation source input for the active leakage current suppression circuit 40, thereby achieving power frequency leakage current suppression; in the three-phase AC charging mode, the first auxiliary switch module and the second auxiliary switch module are connected in parallel as a bridge arm of a certain phase line to charge the energy storage device 200, thereby realizing the reuse of the auxiliary switch tube, simplifying the circuit structure, effectively reducing control complexity and design cost, and having high reliability and wide applicability.

[0389] The structure of the active leakage current suppression circuit 40 will be described in detail below.

[0390] Referring again to Figure 12, in some embodiments, the active leakage current suppression circuit 40 may include: a power supply device, a first transformer T1, and a first Y capacitor CY1.

[0391] In this embodiment, the power supply device is a device for providing excitation.

[0392] In some embodiments, the input terminal of the power supply device is connected to the two input terminals of the auxiliary switching module 190 included in the switching module, so that the auxiliary switching module 190 provides the excitation source.

[0393] The primary side of the first transformer T1 is connected to the power supply device, and the first end of the secondary side of the first transformer T1 is connected to the ground wire through the first Y capacitor CY1 to provide a voltage reference.

[0394] The second end of the secondary side of the first transformer T1 is connected to the phase line and neutral line of the charging system, thereby connecting to the switching transistor module. This allows for the injection of a reverse leakage current into the charging system circuit, where the amplitude difference between the leakage current and the leakage current in the charging system circuit does not exceed the target range and the phase is opposite, thus achieving leakage current suppression.

[0395] In some embodiments, the injection point of the reverse leakage current may include the neutral point of the capacitor module before the fifth filter, the neutral point of the capacitor module after the fifth filter, or the neutral point of the capacitor module before the energy storage device 200. For example, as shown in FIG12, a capacitor module may be provided before the energy storage device 200. The capacitor module includes a fifth capacitor CY5 and a sixth capacitor CY6 connected in series. The injection point of the reverse leakage current is the neutral point between the fifth capacitor CY5 and the sixth capacitor CY6. This application does not limit this.

[0396] The capacitor module is located between the phase line and the neutral line.

[0397] In some embodiments, the capacitor module may include a first sub-capacitor and a second sub-capacitor connected in series.

[0398] The first and second sub-capacitors are connected in series and placed between the L and N lines of the power grid 10. The neutral point of the capacitor module is the midpoint of the potential between the first and second sub-capacitors.

[0399] In some embodiments, the power supply device may include: a third low-pass filter, a fourth filter, and a fourth switch K41.

[0400] In this embodiment, the fourth filter may include, but is not limited to, a π-type filter or other types of EMI filters.

[0401] The output of the fourth filter is connected to the primary side of the first transformer T1, as shown in Figure 12. The fourth filter can be the EMI filter shown in the figure.

[0402] In some embodiments, the input terminal of the third low-pass filter is connected to the fourth inductor L7 and the fifth inductor L8 included in the auxiliary switching module 190, as shown in FIG12. The third low-pass filter can be the low-pass filter shown in the figure.

[0403] The third low-pass filter and the fourth filter are connected in series. The fourth switch K41 is connected in parallel with the two input ports of the third low-pass filter, and the fourth switch K41 is located between the two input terminals of the auxiliary switch module 190 included in the switch module.

[0404] When the fourth switch K41 is closed, the active leakage current suppression circuit 40 is short-circuited and does not work.

[0405] When the fourth switch K41 is open, the third low-pass filter is connected to both ends of the energy storage device 200 via the auxiliary switch tube. The high-voltage DC power output by the energy storage device 200 serves as the excitation source for the active leakage current suppression circuit 40, thereby enabling the active leakage current suppression circuit 40 to operate and generate reverse leakage current, which is then injected into the charging system circuit through the secondary side of the first transformer T1.

[0406] Of course, in other embodiments, the power supply device may also be a low-voltage battery, AC power from the power grid 10, or an active leakage current suppression excitation circuit, which is not limited in this application.

[0407] According to the charging system provided in the embodiments of this application, by setting a third low-pass filter, a fourth filter and a fourth switch, the energy storage device 200 in the system can be used as an excitation source without the need to set an additional excitation source, which further simplifies the circuit structure and effectively reduces control complexity and design cost.

[0408] In some embodiments, the charging system may further include: a plurality of first switches and a plurality of fourth capacitors.

[0409] In this embodiment, as shown in FIG12, the plurality of first switches may include switch K81, switch K82, switch K83 and switch K84.

[0410] Referring again to Figure 12, the multiple seventh capacitors may include C7, C8 and C9.

[0411] At least one first switch is installed on each of the phase line and the neutral line of the power grid 10. When the first switch is closed, the branch circuit set by the first switch is connected.

[0412] The fourth capacitor is placed between the target phase line and the neutral line.

[0413] The target phase line includes at least one of phase lines A, B, and C.

[0414] One end of the fourth capacitor connected to the neutral line is also connected to the second end of the secondary side of the first transformer T1 in the active leakage current suppression circuit 40.

[0415] The end of the fourth capacitor connected to the neutral line is also connected to any one of the multiple phase lines.

[0416] By controlling the opening and closing state of the first switch, the switching between single-phase charging and three-phase charging modes can be achieved.

[0417] In some embodiments, the first switch may include, but is not limited to, a relay.

[0418] For example, continuing to refer to Figure 12, with switches K81 and K84 closed, the charging system operates in single-phase AC input mode.

[0419] In single-phase AC input mode, the fourth switch K41 is opened, and the third low-pass filter is connected to both ends of the energy storage device 200 through the auxiliary switch tube. The high-voltage DC power output by the energy storage device 200 serves as the excitation source of the active leakage current suppression circuit 40, thereby enabling the active leakage current suppression circuit 40 to work.

[0420] With switches K81, K82, and K83 closed, the charging system operates in three-phase AC input mode.

[0421] In the three-phase AC input mode, the fourth switch K41 is closed, which makes the active leakage current suppression circuit 40 not work. In this case, the first auxiliary switch module and the second auxiliary switch module work in parallel as the C-phase bridge arm to charge the energy storage device 200.

[0422] According to the charging system provided in the embodiments of this application, by setting multiple switches, compatibility with single-phase input and three-phase input can be achieved, and the power frequency leakage current and high frequency leakage current can be suppressed in any charging mode, further improving the applicable scenarios and scope of the charging system.

[0423] This application also provides an energy storage system.

[0424] The energy storage system includes an energy storage device and a charging system as described in any of the above embodiments.

[0425] The charging system is used to connect the power grid and the energy storage device to charge the energy storage device.

[0426] In actual implementation, under single-phase AC charging mode, the auxiliary switching module 190 is used to provide an excitation source for the active leakage current suppression circuit to suppress power frequency leakage current; the main switching module 150 adopts a symmetrical switching strategy to suppress high frequency leakage current.

[0427] In the three-phase AC charging mode, the auxiliary switch module 190 is connected in parallel as a phase bridge arm to charge the energy storage device.

[0428] According to the energy storage system provided in the embodiments of this application, by setting up a switching transistor module and an active leakage current suppression circuit, in the single-phase AC charging mode, the auxiliary switching transistor module is reused to provide an excitation source for the active leakage current suppression circuit, and the main switching transistor adopts a symmetrical switching strategy to effectively achieve power frequency leakage current suppression and high frequency leakage current suppression; in the three-phase AC charging mode, the auxiliary switching transistor is connected in parallel as a phase arm to charge the energy storage device; the charging system has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0429] This application also provides a vehicle.

[0430] The vehicle includes an energy storage system as described in any of the above embodiments.

[0431] In this embodiment, the energy storage system is installed in the vehicle body and is used to supply power to the vehicle.

[0432] In actual implementation, under single-phase AC charging mode, the auxiliary switching module 190 is used to provide an excitation source for the active leakage current suppression circuit to suppress power frequency leakage current; the main switching module 150 adopts a symmetrical switching strategy to suppress high frequency leakage current.

[0433] In the three-phase AC charging mode, the auxiliary switch module 190 is connected in parallel as a phase bridge arm to charge the energy storage device.

[0434] The vehicle provided in the embodiments of this application effectively achieves power frequency leakage current suppression and high frequency leakage current suppression by setting a switching transistor module and an active leakage current suppression circuit, combined with a symmetrical switching control strategy and a switching transistor module multiplexing strategy. Moreover, the charging system has a simple structure, low control complexity, low design cost, high reliability, and wide applicability.

[0435] Electric vehicle on-board chargers (OBCs) can be divided into isolated OBCs and non-isolated OBCs based on whether there is electrical isolation between the grid side and the load side. Among them, non-isolated OBCs do not require isolation transformers, which can reduce BOM costs, system size and weight. Moreover, they have better application prospects due to their smaller size, lower system complexity and lower cost compared to isolated OBCs.

[0436] However, the problem with this technology is that the AC and DC sides of a non-isolated OBC are directly connected, resulting in significant leakage current during operation. Electric vehicles typically perform residual current detection during charging and interrupt the charging process when the leakage current exceeds the detection threshold, leading to a poor user experience. Furthermore, a faulty protective earth (PE) wire could even threaten personal safety.

[0437] Figure 13 is a block diagram of a charging system according to an embodiment of this application.

[0438] Specifically, in some embodiments of this application, as shown in FIG13, the charging system 1000 includes: a non-isolated charger 20 and a leakage current suppression circuit 40.

[0439] In this embodiment of the application, as shown in FIG14, the non-isolated charger 20 is disposed between the AC output side of the power grid and the battery pack, and is adapted to convert the AC power provided by the power grid into DC power to charge the battery pack; the leakage current suppression circuit 40 is connected to the non-isolated charger 20 and is adapted to suppress the leakage current generated by the non-isolated charger 20.

[0440] During AC charging of a vehicle, common-mode components from the power grid and common-mode voltage components generated during high-frequency switching of power devices can cause leakage current through the vehicle's Y capacitor. This leakage current returns to the power grid via the PE line, leading to problems such as charging gun malfunction protection. Therefore, in the above embodiments of this application, the charging system 1000 also adds a leakage current suppression circuit 40 connected to the non-isolated charger 20 to suppress the leakage current generated by the non-isolated charger 20, thereby improving the reliability and compatibility of the charging system 1000.

[0441] It should be noted that, in the above embodiments of this application, as shown in Figures 14-5 and 19, the charging system 1000 can also be divided into a charging pile end and a vehicle end, wherein the power grid and grounding resistor R_g are located on the charging pile end side, and the battery pack, non-isolated charger 20 and leakage current suppression circuit 40 are located on the vehicle end side, thereby constituting the charging system 1000 of the embodiments of this application.

[0442] Furthermore, in some embodiments of this application, as shown in FIG14, the non-isolated charger 20 includes: a sixth filter A21, a second filter 25, and a DC-AC conversion module 30.

[0443] The sixth filter A21 is adapted to filter out common-mode and differential-mode interference between the power grid and the non-isolated charger 20; the second filter 25 is adapted to filter out common-mode and differential-mode interference between the non-isolated charger 20 and the battery pack; the DC-AC conversion module 30 is disposed between the sixth filter A21 and the second filter 25 and is adapted to convert the AC power supplied by the power grid into DC power.

[0444] It is understood that in this embodiment of the present application, common-mode and differential-mode interference can be filtered out from the AC output transmitted from the grid to the non-isolated charger 20 by the sixth filter A21, and common-mode and differential-mode interference can be filtered out from the DC output transmitted from the non-isolated charger 20 to the battery pack by the second filter 25.

[0445] Furthermore, in some embodiments of this application, as shown in FIG15, the DC-AC conversion module 30 includes: a first H-bridge A22, a second H-bridge A23, and a third switch module A24.

[0446] The first H-bridge A22 is suitable for converting AC power supplied by the power grid; the second H-bridge A23 is suitable for converting AC power supplied by the power grid; the third switch module A24 is connected to the first H-bridge A22 and the second H-bridge A23 respectively, and is suitable for making the first H-bridge A22 and the second H-bridge A23 output in series.

[0447] Specifically, in the above embodiments of this application, the AC power supplied by the power grid can be converted into DC power through the first H-bridge A22 and the second H-bridge A23, and the first H-bridge 21 and the second H-bridge 22 can be connected in series for output through the third switch module A24. Thus, the non-isolated charger 20 of this application embodiment completes the AC-to-DC conversion and realizes the charging of the battery pack.

[0448] Furthermore, in some embodiments of this application, as shown in FIG16, the first H-bridge A22 includes a first switch KS1, a second switch KS2, a first diode D1 and a second diode D2. The first switch KS1 and the second switch KS2 constitute a high-frequency bridge, and the first diode D1 and the second diode D2 constitute a power frequency bridge.

[0449] It should be noted that in this embodiment of the application, the first switch KS1 and the second switch KS2 are semiconductor power devices.

[0450] Furthermore, in some embodiments of this application, as shown in FIG16, the second H-bridge A23 includes a third switch KS3, a fourth switch KS4, a third diode D3 and a fourth diode D4, and the third switch KS3 and the fourth switch KS4 constitute a high-frequency bridge.

[0451] It should be noted that in this embodiment of the application, the third switch KS3 and the fourth switch KS4 are semiconductor power devices.

[0452] Furthermore, in some embodiments of this application, the first H-bridge A22 and the second H-bridge A23 are configured as two high-frequency bridge symmetrical switches.

[0453] Specifically, in this embodiment of the application, in order to suppress the mid-to-high frequency leakage current generated by the charging system 1000, the two high-frequency bridge symmetrical switches in the first H-bridge A22 and the second H-bridge A23 can be controlled. That is, the first switch KS1 and the fourth switch KS4 are controlled by the same set of PWM signals, and the second switch KS2 and the third switch KS3 are controlled by the same set of PWM signals. This ensures that when the DC+ potential of the DC bus positive terminal jumps, there must also be a simultaneous jump in the opposite direction and the same amplitude of the DC- potential of the DC bus negative terminal. In this way, the high-frequency leakage current is canceled out, so that the high-frequency leakage current flowing through the ground wire is zero.

[0454] Furthermore, in some embodiments of this application, as shown in FIG16, the third switch module A24 includes: a fifth diode D5, a sixth diode D6, a seventh diode D7, and an eighth diode D8.

[0455] In this configuration, the anode of the fifth diode D5 is connected to the first H-bridge A22; the cathode of the sixth diode D6 is connected to the first H-bridge A22; the anode of the seventh diode D7 is connected to the second H-bridge A23, and the cathode of the seventh diode D7 is connected to the cathode of the fifth diode D5; the cathode of the eighth diode D8 is connected to the second H-bridge A23, and the anode of the eighth diode D8 is connected to the anode of the sixth diode D6.

[0456] It is understood that in this embodiment of the present application, the fifth diode D5, the sixth diode D6, the seventh diode D7 and the eighth diode D8 form the third switch module A24. At this time, the first H bridge A22 and the second H bridge A23 can be connected in series to achieve output by adjusting the switching states of the fifth diode D5, the sixth diode D6, the seventh diode D7 and the eighth diode D8.

[0457] Furthermore, in some embodiments of this application, during the positive half-cycle of the AC input, the first switch KS1 and the fourth switch KS4 are controlled to switch at high frequency, the fifth diode D5 and the eighth diode D8 are controlled to conduct, and the sixth diode D6 and the seventh diode D7 are controlled to turn off. During the negative half-cycle of the AC input, the second switch KS2 and the third switch KS3 are controlled to switch at high frequency, the sixth diode D6 and the seventh diode D7 are controlled to conduct, and the fifth diode D5 and the eighth diode D8 are controlled to turn off.

[0458] Specifically, in this embodiment of the application, the first H-bridge A22 and the second H-bridge A23 can be output in series on the DC bus side through the third switch module A24. For example, as shown in FIG16, taking the DC bus output as 2U as an example, when the AC input is in the positive half-cycle, the first switch KS1 and the fourth switch KS4 are controlled to switch at high frequency. At this time, the fifth diode D5 and the eighth diode D8 are turned on, so that the positive terminal DC+ of the DC bus is U and the negative terminal DC- of the DC bus is -U. At the same time, the sixth diode D6 and the seventh diode D7 are turned off, so that the first H-bridge A22 and the second H-bridge A23 are output in series. Similarly, when the AC input is in the negative half-cycle, the second switch KS2 and the third switch KS3 are controlled to switch at high frequency. At this time, the sixth diode D6 and the seventh diode D7 are turned on, so that the positive terminal DC+ of the DC bus is U and the negative terminal DC- of the DC bus is -U. At the same time, the fifth diode D5 and the eighth diode D8 are turned off, so that the first H-bridge A22 and the second H-bridge A23 are output in series.

[0459] Therefore, according to the non-isolated charger 20 of this application embodiment, the first H-bridge A22 and the second H-bridge A23 are connected in series through the third switch module A24, so that the withstand voltage of the switching transistor and diode only needs to be higher than half of the maximum output voltage, which helps to reduce the cost of power devices or reduce the difficulty of device selection in high-voltage chargers.

[0460] Furthermore, in some embodiments of this application, as shown in FIG16, the non-isolated charger 20 further includes a sixth inductor L9 and a seventh inductor L10.

[0461] Specifically, in this embodiment of the application, the sixth inductor L9 is disposed between the sixth filter A21 and the first H-bridge A22; the seventh inductor L10 is disposed between the sixth filter A21 and the second H-bridge A23.

[0462] It should be noted that in this embodiment of the application, the sixth inductor L9 and the seventh inductor L10 are PFC inductors, which serve to filter, store energy and reduce harmonics.

[0463] Furthermore, in some embodiments of this application, as shown in FIG16, the non-isolated charger 20 further includes an eighth capacitor AC1 and a ninth capacitor AC2.

[0464] One end of the eighth capacitor AC1 is connected to the sixth filter A21; one end of the ninth capacitor AC2 is connected to the sixth filter A21, and the other end of the ninth capacitor AC2 is connected to the other end of the eighth capacitor AC1 to form the first midpoint P1; the leakage current suppression circuit 40 is connected to the first midpoint P1.

[0465] It is understood that in this embodiment of the application, the eighth capacitor AC1 and the ninth capacitor AC2 are capacitors in the pre-stage of the sixth filter A21.

[0466] Furthermore, in some embodiments of this application, as shown in FIG16, the non-isolated charger 20 further includes: a tenth capacitor AC3, an eleventh capacitor AC4, a twelfth capacitor AC5, and a thirteenth capacitor AC6.

[0467] Among them, one end of the tenth capacitor AC3 is connected to the sixth filter A21; one end of the eleventh capacitor AC4 is connected to the sixth filter A21, and the other end of the eleventh capacitor AC4 is connected to the other end of the tenth capacitor AC3 to form the second midpoint P2; one end of the twelfth capacitor AC5 is connected to the cathode of the first diode D1, and the other end of the twelfth capacitor AC5 is connected to the anode of the second diode D2; one end of the sixth capacitor C5 is connected to the cathode of the third diode D3, and the other end of the thirteenth capacitor AC6 is connected to the cathode of the fourth diode D4.

[0468] It is understood that in this embodiment of the present application, the tenth capacitor AC3 and the eleventh capacitor AC4 are input capacitors, the twelfth capacitor AC5 is the output capacitor of the first H-bridge A22, and the thirteenth capacitor AC6 is the output capacitor of the second H-bridge A23.

[0469] Furthermore, in some embodiments of this application, as shown in FIG16, the non-isolated charger 20 further includes: a fourteenth capacitor AC7 and a fifteenth capacitor AC8.

[0470] One end of the fourteenth capacitor AC7 is connected to the cathode of the fifth diode D5; one end of the fifteenth capacitor AC8 is connected to the anode of the eighth diode D8, and the other end of the fifteenth capacitor AC8 is connected to the other end of the fourteenth capacitor AC7 to form the third midpoint P3; the second midpoint P2 is connected to the third midpoint P3.

[0471] It is understood that in this embodiment of the present application, the fourteenth capacitor AC7 and the fifteenth capacitor AC8 are the total output capacitors. DC1+ is the positive output terminal of the first H-bridge A22, DC1- is the negative output terminal of the first H-bridge A22, DC2+ is the positive output terminal of the second H-bridge A23, DC2- is the negative output terminal of the second H-bridge A23, DC+ is the positive terminal of the DC bus, DC- is the negative terminal of the DC bus, CY2 is the Y capacitor of the positive terminal of the DC bus to the vehicle ground, and CY3 is the Y capacitor of the negative terminal of the DC bus to the vehicle ground, so as to form a common-mode leakage current loop.

[0472] Therefore, according to the embodiment of the non-isolated charger 20 of this application, DC-side voltage clamping is performed by connecting the second midpoint P2 of the tenth capacitor AC3 and the eleventh capacitor AC4 to the third midpoint P3 of the fourteenth capacitor AC7 and the fifteenth capacitor AC8, thereby further eliminating high-frequency leakage current.

[0473] Furthermore, in some embodiments of this application, as shown in Figures 16 and 17, the leakage current suppression circuit 40 is an active leakage current suppression circuit, wherein the active leakage current suppression circuit includes: a Y capacitor CY1, an active leakage current suppression excitation circuit, and a transformer T1.

[0474] Specifically, in this embodiment of the present application, the active leakage current suppression excitation circuit is adapted to provide an excitation source; the primary side of the transformer T1 is connected to the output side of the active leakage current suppression excitation circuit, one side of the secondary side of the transformer T1 is connected to the Y capacitor CY1, and the other side of the secondary side of the transformer T1 is connected to the non-isolated charger 20.

[0475] Understandably, the active leakage current suppression excitation circuit provides an excitation source for transformer T1. One side of the secondary side of transformer T1 is connected to Y capacitor CY1 to provide a voltage reference, and the other side of the secondary side of transformer T1 is connected to non-isolated charger 20 to inject reverse leakage current into the main circuit, thereby making the net leakage current I_leak on the PE line zero.

[0476] Therefore, the active leakage current suppression circuit 40 according to the embodiments of this application can eliminate the influence of the Y capacitor value offset, thereby matching different vehicle designs and adapting to various working environment conditions. It is highly flexible and has low requirements for new circuit components, which can meet the application requirements of on-board chargers with high withstand voltage requirements.

[0477] Furthermore, in some embodiments of this application, as shown in FIG17, the first diode D1 is replaced with the fifth switch KS5, the second diode D2 is replaced with the sixth switch KS6, the third diode D3 is replaced with the seventh switch S7, the fourth diode D4 is replaced with the eighth switch S8, the fifth diode D5 is replaced with the ninth switch S9, the sixth diode D6 is replaced with the tenth switch S10, the seventh diode D7 is replaced with the eleventh switch S11, and the eighth diode D8 is replaced with the twelfth switch S12.

[0478] It is understood that in this embodiment of the present application, the first to eighth diodes in the aforementioned embodiments of the present application can be replaced with the fifth to twelfth switching transistors, thereby enabling synchronous rectification and bidirectional power transmission.

[0479] Furthermore, in some embodiments of this application, the sixth filter A21 and the second filter 25 can be implemented using different types of filters. For example, the sixth filter A21 and the second filter 25 can be EMI filters, multi-stage π-type filters, etc., without limitation. Similarly, the first switch KS1, the second switch KS2, the third switch KS3 and the fourth switch KS4 can be implemented using any element that can control the switching, such as MOSFET, IGBT, etc., without limitation.

[0480] Furthermore, in some other embodiments of this application, as shown in FIG18, the active leakage current suppression circuit 40 further includes: a Y capacitor CY1, a preprocessing module, and a leakage current suppression module.

[0481] The preprocessing module is connected to the AC input side of the power grid and is suitable for generating the excitation source of the leakage current suppression module; the leakage current suppression module is located between the preprocessing module and the non-isolated charger and is suitable for suppressing the leakage current generated by the non-isolated charger.

[0482] Furthermore, in some embodiments of this application, as shown in FIG19, the preprocessing module includes: a rectifier unit, a DC-DC unit, a high-frequency inverter unit, and a filter unit.

[0483] The rectifier unit is connected to the AC input side of the power grid and is suitable for converting AC power supplied by the power grid into DC power; the DC-DC unit is connected to the rectifier unit and is suitable for converting the voltage amplitude of DC power; the high-frequency inverter unit is connected to the DC-DC unit and is suitable for converting DC power into high-frequency AC power; and the filter unit is connected to the high-frequency inverter unit and is suitable for filtering high-frequency AC power.

[0484] Furthermore, in some embodiments of this application, as shown in FIG19, the leakage current suppression module includes: a transformer T1 and a controller.

[0485] Among them, the primary side of transformer T1 is connected to the filter unit, one side of the secondary side of transformer T1 is connected to Y capacitor CY1, and the other side of the secondary side of transformer T1 is connected to the non-isolated charger 20; the controller is connected to the high-frequency inverter module and is suitable for acquiring leakage current sampling value and adjusting the output voltage of the high-frequency inverter module according to the leakage current sampling value.

[0486] Specifically, in the above embodiments of this application, the AC input from the power grid is used as the excitation source input. First, the AC power provided by the power grid is converted into DC power by the rectifier unit. Then, the DC power is converted into voltage amplitude by the DC-DC unit. Next, the DC power is converted into high-frequency AC power by the high-frequency inverter unit. Then, the high-frequency AC power is filtered by the filter unit. At the same time, the leakage current sampling value is obtained by the controller, and the output voltage of the high-frequency inverter unit is adjusted according to the leakage current sampling value. Thus, the primary side input of transformer T1 is realized. At this time, one side of the secondary side of transformer T1 is connected to Y capacitor CY1 to provide a voltage reference. The other side of the secondary side of transformer T1 is connected to non-isolated charger 20. Thus, reverse leakage current is injected into the main circuit to suppress the low-frequency leakage current generated by non-isolated charger 20.

[0487] Furthermore, in some embodiments of this application, the excitation source input of the active leakage current suppression circuit 40 may include AC input from the mains grid, DC voltage from the battery pack, etc., and the active leakage current suppression circuit 40 may be modified appropriately according to the type of excitation source, without being specifically limited here.

[0488] It should be noted that in the above embodiments of this application, by adding leakage current suppression measures, the leakage current value on the PE line is obtained, and a reverse leakage current is generated according to the leakage current value, so as to inject the reverse leakage current into the circuit to suppress the low-frequency leakage current; and the high-frequency bridge in the H-bridge is controlled to adopt a symmetrical switching strategy and DC side voltage clamping to suppress the high-frequency leakage current generated in the circuit, thereby making the non-isolated OBC practical. In addition, the two H-bridges are connected in series to output through the switching group to reduce the requirement for the withstand voltage value of the components.

[0489] In summary, the charging system according to the embodiments of this application places a non-isolated charger between the AC output side of the power grid and the battery pack. This allows the charger to convert the AC power supplied by the power grid into DC power to charge the battery pack. Simultaneously, a leakage current suppression circuit is connected to the non-isolated charger to suppress its leakage current. Therefore, by adding leakage current suppression measures, the leakage current generated by the non-isolated charger is suppressed, thereby making the charging system adaptable to various types of vehicles and charging application scenarios.

[0490] Figure 20 is a block diagram of a vehicle according to an embodiment of this application.

[0491] [Correction based on Rule 91 04.06.2025] Specifically, in some embodiments of this application, as shown in FIG20, the vehicle 2000 includes an energy storage device 200 and a charging system 1000 as described in the embodiments of this application above.

[0492] It should be noted that the specific implementation of the vehicle in this application embodiment can refer to the specific implementation of the charging system in the foregoing embodiment of this application. To reduce redundancy, it will not be repeated here.

[0493] In summary, the vehicle according to the embodiments of this application, by adopting the charging system described in the foregoing embodiments of this application, can suppress the leakage current generated by the non-isolated charger by adding leakage current suppression measures, thereby making the charging system adaptable to the needs of various types of vehicles and charging application scenarios.

[0494] As the charging power of on-board chargers (OBCs) for new energy vehicles continues to increase, the size, weight, and cost of independent OBC hardware circuits also increase. Currently, integrating OBCs with high-voltage devices in the vehicle can improve circuit integration and power density, reduce circuit costs, and reduce circuit size, which has become the development direction of OBCs. For example, charging functions can be achieved by reusing the windings of the electric drive unit or the motor controller.

[0495] However, the problem with this technology is that, due to the lack of electrical isolation between the grid side and the load side, there will be a significant leakage current during operation. Furthermore, electric vehicle charging typically requires residual current detection, and the charging process is interrupted when the leakage current exceeds the detection threshold, resulting in a poor user experience. Moreover, if the protective earth (PE) wire fails, it could even threaten personal safety.

[0496] [Correction 04.06.2025 based on Rule 91] Figure 21 is a block diagram of a charging system according to an embodiment of this application.

[0497] [Correction 04.06.2025 based on Rule 91] Specifically, in some embodiments of this application, as shown in FIG21, the charging system 1000 includes: an AC-DC conversion circuit B10, a fourth switching module B20, and a leakage current suppression circuit 40.

[0498] The AC-DC conversion circuit B10 is adapted to convert AC power supplied by the power grid into DC power to charge the battery pack; the fourth switch module B20 is adapted to change the connection mode between the power grid and the AC-DC conversion circuit B10 so that the charging system 1000 can operate in single-phase AC charging mode or three-phase AC charging mode; the leakage current suppression circuit 40 is adapted to suppress the leakage current of the AC-DC conversion circuit B10.

[0499] It is understood that in this embodiment of the present application, the charging system 1000 can change the connection mode between the power grid and the AC-DC conversion circuit B10 through the fourth switch module B20, so as to realize the circuit switching of the charging system 1000 under single-phase and three-phase input conditions, so that the charging system 1000 can work in single-phase AC charging mode (corresponding to single-phase input conditions) or three-phase AC charging mode (corresponding to three-phase input conditions). At this time, the AC-DC conversion circuit B10 can convert the AC voltage on the power grid side into the DC voltage on the battery pack side, thereby realizing the charging of the battery pack.

[0500] In addition, during the AC charging process of the vehicle, the common-mode components of the power grid and the common-mode voltage components generated during the high-frequency switching of power devices will form leakage current through the Y capacitor of the vehicle. This leakage current returns to the power grid through the PE line, causing electromagnetic interference and other problems. Therefore, in the above embodiments of this application, a leakage current suppression circuit 40 is added to suppress the leakage current of the AC-DC conversion circuit B10, so as to eliminate the influence of Y capacitor value drift, thereby improving the reliability and compatibility of the charging system 1000.

[0501] Furthermore, in some embodiments of this application, as shown in Figures 24 and 26, the fourth switch module B20 includes a fifth switch K81, a sixth switch K82, a seventh switch K83, and an eighth switch K84. The A phase of the power grid is connected to the AC-DC conversion circuit B10 through the fifth switch K81, the B phase of the power grid is connected to the AC-DC conversion circuit B10 through the sixth switch K82, the C phase of the power grid is connected to the AC-DC conversion circuit B10 through the seventh switch K83, and the N phase of the power grid is connected to the AC-DC conversion circuit B10 through the eighth switch K84.

[0502] It is understood that in this embodiment of the present application, when the fifth switch K81 is configured to be in the on state, phase A of the power grid is connected to the AC-DC conversion circuit B10, and when the fifth switch K81 is configured to be in the off state, phase A of the power grid is disconnected from the AC-DC conversion circuit B10.

[0503] When the sixth switch K82 is configured to be on, phase B of the power grid is connected to the AC-DC conversion circuit B10; and when the sixth switch K82 is configured to be off, phase B of the power grid is disconnected from the AC-DC conversion circuit B10. When the seventh switch K83 is configured to be on, phase C of the power grid is connected to the AC-DC conversion circuit B10; and when the seventh switch K83 is configured to be off, phase C of the power grid is disconnected from the AC-DC conversion circuit B10.

[0504] When the eighth switch K84 is configured to be in the on state, the N phase of the power grid is connected to the AC-DC conversion circuit B10, and when the eighth switch K84 is configured to be in the off state, the N phase of the power grid is disconnected from the AC-DC conversion circuit B10.

[0505] Therefore, in the above embodiments of this application, the charging system 1000 consists of a charging pile and a vehicle. The connection mode between the A phase, B phase, C phase and N phase of the power grid and the AC-DC conversion circuit B10 can be changed by changing the fifth switch K81, the sixth switch K82, the seventh switch K83 and the eighth switch K84, thereby realizing the circuit switching of the charging system 1000 under single-phase and three-phase input conditions.

[0506] Furthermore, in some embodiments of this application, as shown in FIG22, the AC-DC conversion circuit B10 includes at least one electric drive unit 101, at least one inductor 102 and at least one switching transistor 103.

[0507] In this configuration, at least one electric drive unit 101 is connected to the fourth switch module B20, at least one inductor 102 is connected to the leakage current suppression circuit 40, and at least one switch transistor 103 is disposed between at least one inductor 102 and at least one electric drive unit 101.

[0508] It is understood that in this embodiment of the present application, the AC-DC conversion circuit B10 can increase the power device capacity by reusing at least one three-phase bridge arm of the electric drive unit 101 as one phase bridge arm. After converting the AC power supplied by the grid into DC power by combining at least one newly added switch 103 and at least one inductor 102, the battery pack is charged. At the same time, at least one switch 103 is connected to the leakage current suppression circuit 40 through at least one inductor 102, so that the leakage current suppression circuit 40 can generate a reverse leakage current with the battery pack as the excitation source input, and inject the reverse leakage current into the circuit to suppress the leakage current in the single-phase AC charging mode. In this case, the DC power supplied by the battery pack is converted by at least one inductor 102 and at least one switch 103, thereby generating the required current in the leakage current suppression circuit 40, and thus suppressing the leakage current of the AC-DC conversion circuit B10.

[0509] Specifically, in some embodiments of this application, as shown in FIG23, at least one electric drive unit 101 includes a first electric drive unit 1011 and a second electric drive unit 1012.

[0510] The first electric drive unit 1011 is disposed between the fifth switch K81 and the battery pack, and the first electric drive unit 1011 includes a first three-phase bridge arm; the second electric drive unit 1012 is disposed between the sixth switch K82 and the battery pack, and the second electric drive unit 1012 includes a second three-phase bridge arm.

[0511] It is understood that in this embodiment of the present application, the first three-phase bridge arm of the first electric drive unit 1011 can be connected to phase A of the power grid via the fifth switch K81 to serve as phase A bridge arm, and the second three-phase bridge arm of the second electric drive unit 1012 can be connected to phase B of the power grid via the sixth switch K82 to serve as phase B bridge arm.

[0512] Specifically, in some embodiments of this application, as shown in Figures 24 and 26, at least one switch 103 includes a seventh switch BS1, an eighth switch BS2, a ninth switch BS3, and a tenth switch BS4.

[0513] Among them, the seventh switch BS1 and the eighth switch BS2 constitute the first bridge arm, and the ninth switch BS3 and the tenth switch BS4 constitute the second bridge arm.

[0514] It is understood that, in this embodiment of the present application, the first bridge arm and the second bridge arm can be rectified or inverted by controlling the opening and closing states of the seventh switch BS1, the eighth switch BS2, the ninth switch BS3 and the tenth switch BS4.

[0515] More specifically, in some embodiments of this application, as shown in Figures 24 and 26, at least one inductor 102 includes an eighth inductor L11 and a ninth inductor L12.

[0516] The middle node of the first bridge arm is connected to the leakage current suppression circuit 40 through the eighth inductor L11, and the middle node of the second bridge arm is connected to the leakage current suppression circuit 40 through the ninth inductor L12.

[0517] It is understood that in this embodiment of the present application, the eighth inductor L11 and the ninth inductor L12 can play the roles of current smoothing, reducing switching noise, improving efficiency, suppressing short-circuit current, improving power factor, filtering, reducing switching losses and improving stability.

[0518] Furthermore, in some embodiments of this application, when the fifth switch K81 and the eighth switch K84 are configured to be in the on state, and the first electric drive unit 1011 is configured to be connected to the fifth switch K81 and the second electric drive unit 1012 is configured to be connected to the eighth switch K84, the charging system 1000 is configured to operate in single-phase AC charging mode.

[0519] Specifically, in this embodiment of the application, as shown in FIG24, when the fifth switch K81 and the eighth switch K84 are turned on, and the first electric drive unit 1011 is connected to the fifth switch K81 (at this time, switch K31 is turned on) and the second electric drive unit 1012 is connected to the eighth switch K84 (at this time, switch K32 is turned on), the charging system 1000 operates in single-phase AC charging mode. At this time, the AC-DC conversion circuit 40 reuses the winding M1 of the first electric drive unit 1011 and the second electric drive unit 1012 respectively. The winding M2 of 012 serves as the PFC inductor for phase A and phase N, and reuses the motor controller of the first electric drive unit 1011 (i.e., the first three-phase bridge arm) and the motor controller of the second electric drive unit 1012 (i.e., the second three-phase bridge arm) as phase A half-bridge and phase N half-bridge, respectively. Generally, the stator winding parameters of the motor need to be equal, that is, the first electric drive unit 1011 and the second electric drive unit 1012 constitute a single-phase AC-DC module to rectify the AC power provided by the grid into DC power for charging the battery pack.

[0520] Furthermore, in some embodiments of this application, as shown in FIG24, the charging system 1000 further includes a common-mode inductor BL3, which is disposed between the fourth switching module B20 and the AC-DC conversion circuit B10.

[0521] It is understood that in this embodiment of the present application, the common-mode inductor BL3 can be used to suppress high-frequency leakage current.

[0522] Furthermore, in some embodiments of this application, when the fifth switch K81, the sixth switch K82, and the seventh switch K83 are configured to be in the on state, and the first electric drive unit 1011 is configured to be connected to the fifth switch K81 and the second electric drive unit 1012 is configured to be connected to the sixth switch K82, the charging system 1000 is configured to operate in a three-phase AC charging mode.

[0523] Specifically, in this embodiment of the application, as shown in FIG24, when the fifth switch K81, the sixth switch K82, and the seventh switch K83 are turned on, and the first electric drive unit 1011 (i.e., M1 and its motor controller) is connected to the fifth switch K81 (i.e., switch K31 is turned on) and the second electric drive unit 1012 (i.e., M2 and its motor controller) is connected to the sixth switch K82 (i.e., switch K32 is turned on), the charging system 1000 operates in a three-phase AC charging mode. At this time, the AC-DC conversion circuit B10 reuses the winding M1 of the first electric drive unit 1011 and the winding M2 of the second electric drive unit 1012, respectively. The PFC inductors for phases A and B are used, and the motor controllers of the first electric drive unit 1011 and the second electric drive unit 1012 are reused as phase A half-bridge and phase B half-bridge, respectively. The additional first bridge arm and second bridge arm are connected in parallel (at this time, switch S41 is turned on) as phase C bridge arm connected to the seventh switch K83. That is, the first electric drive unit 1011, the second electric drive unit 1012, the first bridge arm, the second bridge arm, the eighth inductor L11, the ninth inductor L12 and the common mode inductor BL3 constitute a three-phase AC-DC module to rectify the AC power provided by the grid into DC power for charging the battery pack.

[0524] It should be noted that in the above embodiments of this application, the parameters of the eighth inductor L11 and the ninth inductor L12 can be matched with the winding parameters of the first electric drive unit 1011 and the second electric drive unit 1012, that is, the self-inductance values ​​of L1 and L2 are equal, the self-inductance values ​​of the stator windings of M1 and M2 are equal, and the self-inductance of L1 is equal to twice the self-inductance of the stator winding of M1, so as to ensure the symmetry of the high-frequency switching bridge of the three-phase AC-DC module.

[0525] Furthermore, in some embodiments of this application, as shown in FIG25, at least one electric drive unit 101 includes a third electric drive unit 1013.

[0526] The third electric drive unit 1013 is located between the seventh switch K83 and the battery pack, and the third electric drive unit 1013 includes a third three-phase bridge arm.

[0527] It is understood that, in this embodiment of the present application, the third three-phase bridge arm of the third electric drive unit 1013 can be connected to the C phase of the power grid via the seventh switch K83 to serve as the C phase bridge arm.

[0528] Furthermore, in some embodiments of this application, when the fifth switch K81 and the eighth switch K84 are configured to be in the on state, and the first electric drive unit 1011 is configured to be connected to the fifth switch K81 and the second electric drive unit 1012 is configured to be connected to the eighth switch K84, the charging system 1000 operates in single-phase AC charging mode.

[0529] It should be noted that in this embodiment of the present application, the principle of the single-phase AC-DC module composed of the first electric drive unit 1011 and the second electric drive unit 1012 as shown in FIG26 is consistent with the principle of the single-phase AC-DC module composed of the first electric drive unit 1011 and the second electric drive unit 1012 as shown in FIG24. To reduce redundancy, it will not be described again here.

[0530] Furthermore, in some embodiments of this application, when the fifth switch K81, the sixth switch K82, and the seventh switch K83 are configured to be in the on state, and the first electric drive unit 1011 is configured to be connected to the fifth switch K81, the second electric drive unit 1012 is configured to be connected to the sixth switch K82, and the third electric drive unit 1013 is configured to be connected to the seventh switch K83, the charging system 1000 is configured to operate in a three-phase AC charging mode.

[0531] Specifically, in this embodiment of the application, as shown in FIG26, when the fifth switch K81, the sixth switch K82, and the seventh switch K83 are turned on, and the first electric drive unit 1011 (i.e., M1 and its motor controller) is connected to the fifth switch K81 (at this time, switch K31 is turned on), the second electric drive unit 1012 (i.e., M2 and its motor controller) is connected to the sixth switch K82 (at this time, switch K32 is turned on), and the third electric drive unit 1013 (i.e., M3 and its motor controller) is connected to the seventh switch K83 (at this time, switch K33 is turned on), the charging system 1000 operates in a three-phase AC charging mode. At this time, the AC-DC conversion circuit B10 reuses the first electric drive unit... The winding M1 of the first electric drive unit 1011, the winding M2 of the second electric drive unit 1012, and the winding M3 of the third electric drive unit 1013 serve as PFC inductors for phases A, B, and C, respectively. The motor controllers of the first electric drive unit 1011, the second electric drive unit 1012, and the third electric drive unit 1013 are reused as half-bridges for phases A, B, and C, respectively. Generally, the stator winding parameters of the motor need to be equal. In this case, the first electric drive unit 1011, the second electric drive unit 1012, the third electric drive unit 1013, and the common-mode inductor BL3 constitute a three-phase AC-DC module to rectify the AC power provided by the grid into DC power for charging the battery pack.

[0532] Furthermore, in some embodiments of this application, as shown in Figures 24 and 26, the leakage current suppression circuit 40 is an active power frequency leakage current suppression circuit, which includes a Y capacitor CY1, a filter, a transformer T1, and a controller.

[0533] The filter is adapted to acquire the excitation source and filter the excitation source; the primary side of the transformer T1 is connected to the filter, one side of the secondary side of the transformer is connected to the Y capacitor CY1, and the other side of the secondary side of the transformer T1 is connected to the at least one electric drive unit 101; the controller is connected to at least one switching transistor 103 and is adapted to acquire the leakage current sampling value and adjust the duty cycle of at least one switching transistor 103 according to the leakage current sampling value.

[0534] It is understood that, in some embodiments of this application, as shown in Figures 24 and 26, the active power frequency leakage current suppression circuit can convert the DC power supplied by the battery pack into a high-frequency AC excitation source input through an inverter circuit composed of the seventh switch BS1, the eighth switch BS2, the ninth switch BS3, the tenth switch BS4, the eighth inductor L11, and the ninth inductor L12. Then, the controller can control the duty cycle of the high-frequency inverter stage based on the leakage current sampling value I_leak on the PE line, so as to eliminate the high-frequency component in the high-frequency inverter output voltage and retain the low-frequency component through the filter. The low-frequency component is applied to both sides of the primary side of the transformer T1, and one side of the secondary side of the transformer is connected to the Y capacitor CY1, and the other side is connected to the common point of capacitors C2 and C3, so as to inject the reverse leakage current into the circuit to suppress the leakage current in the single-phase AC charging mode, thereby suppressing the leakage current of the AC-DC conversion circuit B10.

[0535] Optionally, in the above embodiments of this application, as shown in Figures 24 and 26, the filter may include a low-pass filter and an EMI filter.

[0536] Specifically, in some embodiments of this application, on the one hand, under single-phase grid input conditions, the charging system 1000 suppresses low- and medium-frequency leakage current through leakage current suppression circuit 40, and ensures that when the DC bus positive potential has a jumping trend, the DC bus negative potential also has a jumping trend in the opposite direction and with the same amplitude by controlling the symmetrical switching of the high-frequency switching transistor in the AC-DC module main circuit, thereby achieving high-frequency leakage current cancellation. On the other hand, under three-phase grid input conditions, since the sum of the low- and medium-frequency leakage currents generated by the three phases is theoretically zero, the three-phase bridge arm control strategy is optimized. At this time, it is not necessary to suppress the low- and medium-frequency leakage current through leakage current suppression circuit 40, and the high-frequency leakage current generated in the circuit can be effectively suppressed by common-mode inductor BL3.

[0537] Furthermore, in some embodiments of this application, when the charging system 1000 operates in single-phase AC charging mode, the first three-phase bridge arm is configured to be connected in parallel as an A-phase half-bridge, and the second three-phase bridge arm is configured to be connected in parallel as an N-phase half-bridge. The A-phase half-bridge and the N-phase half-bridge are configured such that the upper tube of the A-phase half-bridge and the lower tube of the N-phase half-bridge are switched synchronously, and the lower tube of the A-phase half-bridge and the upper tube of the N-phase half-bridge are switched synchronously. It is understood that in this embodiment of the present application, when the charging system 1000 operates in single-phase AC charging mode, high-frequency leakage current suppression can be achieved through a symmetrical switching strategy. The symmetrical switching is described below: by connecting the first three-phase bridge arm in parallel as an A-phase half-bridge and configuring the second three-phase bridge arm in parallel as an N-phase half-bridge, the A-phase half-bridge and the N-phase half-bridge are configured such that the upper tube of the A-phase half-bridge and the lower tube of the N-phase half-bridge are switched synchronously, and the lower tube of the A-phase half-bridge and the upper tube of the N-phase half-bridge are switched synchronously. As a result, the positive terminal of the high-voltage bus of the battery pack has a positive jump trend, and the negative terminal potential has a negative jump trend of the same amplitude. This ensures that the ground potential of the high-voltage bus of the battery pack remains stable, thereby suppressing the generation of high-frequency leakage current.

[0538] Furthermore, in some embodiments of this application, when the charging system operates in three-phase AC charging mode, the seventh switch BS1, the eighth switch BS2, the ninth switch BS3, and the tenth switch BS4 are configured to be in the off state.

[0539] It is understood that in this embodiment of the present application, when the charging system 1000 operates in three-phase AC charging mode, the power frequency leakage current is theoretically zero. The three-phase bridge arm control strategy can be optimized to stabilize the voltage of the battery pack high-voltage bus to ground. At this time, there is no need to suppress the power frequency leakage current, and the seventh switch BS1, the eighth switch BS2, the ninth switch BS3 and the tenth switch BS4 can be controlled to be in the off state. On the other hand, the high-frequency leakage current generated in the circuit can be effectively suppressed by the common mode inductor BL3.

[0540] In summary, the charging system according to the embodiments of this application changes the connection mode between the power grid and the AC-DC conversion circuit through a switching module, enabling the charging system to operate in single-phase AC charging mode or three-phase AC charging mode. Furthermore, the AC-DC conversion circuit converts the AC power supplied by the power grid into DC power to charge the battery pack. Additionally, a leakage current suppression circuit suppresses the leakage current of the AC-DC conversion circuit. Therefore, while achieving compatibility with single-phase and three-phase inputs and reducing the capacity requirements of power devices, the addition of leakage current suppression measures reduces the leakage current generated during the operation of the charging system, thereby making the charging system adaptable to various types of vehicles and charging environments.

[0541] [Correction 04.06.2025 based on Rule 91] Figure 20 is a block diagram of a vehicle 2000 according to an embodiment of this application.

[0542] [Correction based on Rule 91 04.06.2025] Specifically, in some embodiments of this application, as shown in FIG20, the vehicle 2000 includes an energy storage device 200 and a charging system 1000 as described in the embodiments of this application.

[0543] It should be noted that the specific implementation of the vehicle in this application embodiment can refer to the specific implementation of the charging system 1000 in the aforementioned application embodiment. To reduce redundancy, it will not be repeated here.

[0544] In summary, the vehicle according to the embodiments of this application, by adopting the aforementioned charging system, can achieve compatibility of the charging system with single-phase and three-phase inputs and reduce the capacity requirements of power devices, while reducing the leakage current generated during the operation of the charging system by adding leakage current suppression measures, thereby making the charging system adaptable to various types of vehicles and charging environments.

[0545] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0546] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0547] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0548] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0549] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0550] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A charging system, characterized in that, include: A non-isolated charger is connected between the power grid and the energy storage device, and at least one capacitor module is provided between the phase line and the neutral line of the non-isolated charger. An active leakage current suppression circuit includes a power supply device. The active leakage current suppression circuit is connected to the ground wire of the power grid and the neutral point of the first target capacitor module in the at least one capacitor module. The power supply device is used to provide power excitation to the active leakage current suppression circuit so that the active leakage current suppression circuit generates a reverse leakage current whose amplitude difference from the leakage current in the charging system does not exceed the target range and whose phase is opposite.

2. The charging system according to claim 1, characterized in that, The active leakage current suppression circuit further includes: First Y capacitor; The first transformer has its primary side connected to the power supply device, its secondary side has its first end connected to the ground wire via the first Y capacitor, and its second end connected to the neutral point of the first target capacitor module.

3. The charging system according to claim 2, characterized in that, The active leakage current suppression circuit further includes: a second transformer. The primary side of the second transformer is used to connect to the power grid. The second transformer and the first transformer are connected in series or in parallel. When the first transformer and the second transformer are connected in series, the third end of the secondary side of the second transformer is connected to the neutral point of the first target capacitor module, and the fourth end of the secondary side of the second transformer is connected to the second end of the secondary side of the first transformer. When the first transformer and the second transformer are connected in parallel, the third terminal of the secondary side of the second transformer is connected to the neutral point of the second target capacitor module in the at least one capacitor module, and the fourth terminal of the secondary side of the second transformer is connected to the ground wire via the second Y capacitor.

4. The charging system according to claim 2, characterized in that, The power supply device includes an active leakage current suppression excitation circuit, which is connected to the primary side of the first transformer.

5. The charging system according to claim 2, characterized in that, The power supply device includes: A voltage source module, the output terminal of which is connected to the primary side of the first transformer; The first sampling module is connected to the voltage source module and is used to collect the leakage current of the ground wire and control the voltage source module based on the leakage current.

6. The charging system according to claim 5, characterized in that, The voltage source module includes: The system comprises a first battery, a first high-frequency inverter, a first low-pass filter, and a first filter, wherein the output of the first filter is connected to the primary side of the first transformer; and the first sampling module is connected to the first high-frequency inverter.

7. The charging system according to claim 5, characterized in that, The voltage source module includes: The system includes a rectifier circuit, a first DC / DC converter, a second high-frequency inverter, a second low-pass filter, and a second filter. The output of the second filter is connected to the primary side of the first transformer. The rectifier circuit is connected to the power grid. The first sampling module is connected to the second high-frequency inverter.

8. The charging system according to claim 5, characterized in that, The voltage source module includes: The system comprises a second DC / DC converter, a third high-frequency inverter, a third low-pass filter, and a third filter. The output of the third filter is connected to the primary side of the first transformer. The input of the second DC / DC converter is connected to both ends of the energy storage device. The first sampling module is connected to the third high-frequency inverter.

9. The charging system according to claim 1, characterized in that, The power supply device includes: The system comprises a third DC / DC converter, a fourth high-frequency inverter, a fourth low-pass filter, and a fourth filter. The first output terminal of the fourth filter is connected to the ground line via the first Y capacitor included in the active leakage current suppression circuit. The second output terminal of the fourth filter is connected to the neutral point of the first target capacitor module. The input terminal of the third DC / DC converter is connected to both ends of the energy storage device. A second sampling module connected to the fourth high-frequency inverter is used to collect the leakage current of the ground wire and control the fourth high-frequency inverter based on the leakage current.

10. The charging system according to any one of claims 1-9, characterized in that, The non-isolated charger includes: a first sub-filter, an H-bridge circuit, and a second sub-filter, wherein... The input terminal of the first sub-filter is used to connect to the power grid; the output terminal of the second sub-filter is connected to the energy storage device. The capacitor module is disposed before the input terminal of the first sub-filter, or the capacitor module is disposed between the first sub-filter and the H-bridge circuit, or the capacitor module is disposed after the output terminal of the H-bridge circuit, or the capacitor module is disposed after the second sub-filter.

11. The charging system according to any one of claims 1-10, characterized in that, Also includes: A switching module, wherein the switching module is disposed between the phase line and the neutral line between the power grid and the non-isolated charger; The third switch is disposed between the active leakage current suppression circuit and the non-isolated charger.

12. A charging system, characterized in that, include: A switching transistor module, wherein the switching transistor module is connected between the power grid and the energy storage device; An active leakage current suppression circuit is connected to the ground wire of the power grid and the switching transistor module, respectively. The active leakage current suppression circuit is used to generate a reverse leakage current whose amplitude difference from the leakage current in the charging system does not exceed the target range and whose phase is opposite.

13. The charging system according to claim 12, characterized in that, The switching transistor module includes: A main switch module, which is connected between the power grid and the energy storage device; An auxiliary switching module is connected between the power grid and the energy storage device; the auxiliary switching module is used to provide an excitation source for the active leakage current suppression circuit. The main switch module and the auxiliary switch module are connected in parallel.

14. The charging system according to claim 13, characterized in that, The switching transistor module also includes: The first inductor module is connected sequentially between the power grid and the energy storage device, along with the main switch module.

15. The charging system according to claim 14, characterized in that, The main switch module includes a first main switch module and a second main switch module connected in parallel. The first inductor module includes a second inductor and a third inductor. The first main switch module includes a first sub-switch and a second sub-switch connected in series, and the midpoint between the first sub-switch and the second sub-switch is connected to the first phase line of the charging system via the second inductor; The second main switch module includes a third sub-switch and a fourth sub-switch connected in series. The midpoint between the third sub-switch and the fourth sub-switch is connected to the second phase line of the charging system via the third inductor.

16. The charging system according to claim 15, characterized in that, The second inductor and the third inductor have the same inductance value.

17. The charging system according to claim 13, characterized in that, The main switch module employs a symmetrical switching control strategy to suppress high-frequency leakage current in the charging system.

18. The charging system according to claim 15, characterized in that, The switching transistor module also includes: The second inductor module and the auxiliary switch module are sequentially connected between the power grid and the energy storage device. The second inductor module and the auxiliary switch module are connected to the active leakage current suppression circuit.

19. The charging system according to claim 18, characterized in that, The auxiliary switching module includes a first auxiliary switching module and a second auxiliary switching module connected in parallel; the second inductor module includes a fourth inductor and a fifth inductor; wherein... The first auxiliary switch module includes a fifth sub-switch and a sixth sub-switch connected in series. The midpoint between the fifth sub-switch and the sixth sub-switch is connected to the third phase line of the charging system and the input terminal of the active leakage current suppression circuit via the fourth inductor. The second auxiliary switch module includes a seventh sub-switch and an eighth sub-switch connected in series. The midpoint between the seventh sub-switch and the eighth sub-switch is connected to the third phase line and the input terminal of the active leakage current suppression circuit via the fifth inductor.

20. The charging system according to claim 19, characterized in that, The fourth inductor and the fifth inductor have the same inductance value, and the inductance value of the fourth inductor is twice that of the second inductor.

21. The charging system according to any one of claims 12-20, characterized in that, The active leakage current suppression circuit includes: A power supply device, wherein the input terminal of the power supply device is connected to the two input terminals of the auxiliary switching transistor module included in the switching transistor module; A first transformer, the primary side of which is connected to the power supply device; The first Y capacitor is connected to the ground wire via the first end of the secondary side of the first transformer, and the second end of the secondary side is connected to the phase wire and neutral wire of the charging system.

22. The charging system according to claim 21, characterized in that, The power supply device includes: The third low-pass filter and the fourth filter, wherein the output of the fourth filter is connected to the primary side of the first transformer, and the input of the third low-pass filter is connected to the fourth inductor and the fifth inductor included in the auxiliary switching module; The fourth switch is connected in parallel with the two input ports of the third low-pass filter, and the fourth switch is located between the two input ports of the auxiliary switch module.

23. The charging system according to any one of claims 12-22, characterized in that, Also includes: Multiple first switches are provided on multiple phase lines and neutral lines of the charging system; Multiple fourth capacitors are provided, wherein the fourth capacitors are disposed between the target phase line and the neutral line, and one end of the fourth capacitor connected to the neutral line is also connected to the active leakage current suppression circuit.

24. The charging system according to any one of claims 12-23, characterized in that, Also includes: A common-mode inductor module is connected between the power grid and the switching transistor module, and the common-mode inductor module is disposed on the phase line of the charging system.

25. The charging system according to any one of claims 12-24, characterized in that, The switching transistor module adopts a symmetrical switching control strategy.

26. A charging system, characterized in that, The system includes: A non-isolated charger is disposed between the AC output side of the power grid and the energy storage device, and is suitable for converting the AC power provided by the power grid into DC power to charge the energy storage device. A leakage current suppression circuit is connected to the non-isolated charger and is adapted to suppress the leakage current generated by the non-isolated charger.

27. The charging system according to claim 26, characterized in that, The non-isolated charger includes: The sixth filter is adapted to filter out common-mode and differential-mode interference between the power grid and the non-isolated charger; The seventh filter is adapted to filter out common-mode and differential-mode interference between the non-isolated charger and the energy storage device; A DC-AC conversion module is disposed between the sixth filter and the seventh filter, and is adapted to convert the alternating current supplied by the power grid into direct current.

28. The charging system according to claim 27, characterized in that, The DC-AC conversion module includes: The first H-bridge is adapted to transform the alternating current supplied by the power grid; The second H-bridge is adapted to transform the alternating current supplied by the power grid; The third switching module is connected to the first H-bridge and the second H-bridge respectively, and is adapted to enable the first H-bridge and the second H-bridge to output in series.

29. The charging system according to claim 28, characterized in that, The first H-bridge includes a first switch, a second switch, a first diode, and a second diode. The first switch and the second switch constitute a high-frequency bridge, and the first diode and the second diode constitute a power frequency bridge.

30. The charging system according to claim 29, characterized in that, The second H-bridge includes a third switch, a fourth switch, a third diode, and a fourth diode. The third switch and the fourth switch constitute a high-frequency bridge, and the third diode and the fourth diode constitute a power frequency bridge.

31. The charging system according to claim 30, characterized in that, The first H-bridge and the second H-bridge are configured as two high-frequency bridge symmetrical switches.

32. The charging system according to claim 30, characterized in that, The third switch module includes: The fifth diode, wherein the anode of the fifth diode is connected to the first H-bridge; The sixth diode, the cathode of which is connected to the first H-bridge; The seventh diode, the anode of which is connected to the second H-bridge, and the cathode of which is connected to the cathode of the fifth diode; The eighth diode has its cathode connected to the second H-bridge and its anode connected to the anode of the sixth diode.

33. The charging system according to claim 32, characterized in that, During the positive half-cycle of the AC input, the first and fourth switching transistors are controlled to switch at high frequency, the fifth and eighth diodes are controlled to conduct, and the sixth and seventh diodes are controlled to turn off. During the negative half-cycle of the AC input, the second and third switching transistors are controlled to switch at high frequency, the sixth and seventh diodes are controlled to conduct, and the fifth and eighth diodes are controlled to turn off.

34. The charging system according to claim 33, characterized in that, The non-isolated charger also includes: The sixth inductor is disposed between the sixth filter and the first H-bridge; The seventh inductor is disposed between the sixth filter and the second H-bridge.

35. The charging system according to claim 34, characterized in that, The non-isolated charger also includes: The fifteenth capacitor, one end of which is connected to the sixth filter; The ninth capacitor has one end connected to the sixth filter and the other end connected to the other end of the fifteenth capacitor to form a first midpoint. The leakage current suppression circuit is connected to the first midpoint.

36. The charging system according to claim 35, characterized in that, The non-isolated charger also includes: The tenth capacitor, one end of which is connected to the sixth filter; The eleventh capacitor has one end connected to the sixth filter and the other end connected to the other end of the tenth capacitor to form a second midpoint. The twelfth capacitor has one end connected to the cathode of the first diode and the other end connected to the anode of the second diode. The thirteenth capacitor has one end connected to the cathode of the third diode and the other end connected to the cathode of the fourth diode.

37. The charging system according to claim 36, characterized in that, The non-isolated charger also includes: The fourteenth capacitor, one end of which is connected to the cathode of the fifth diode; The fifteenth capacitor has one end connected to the anode of the eighth diode and the other end connected to the other end of the fourteenth capacitor to form a third midpoint. The second midpoint is connected to the third midpoint.

38. The charging system according to any one of claims 26-37, characterized in that, The leakage current suppression circuit is an active leakage current suppression circuit, wherein the active leakage current suppression circuit includes: Y capacitor; An active leakage current suppression excitation circuit is suitable for providing an excitation source; The transformer has its primary side connected to the output side of the active leakage current suppression excitation circuit, one side of the secondary side of the transformer connected to the Y capacitor, and the other side of the secondary side of the transformer connected to the non-isolated charger.

39. The charging system according to claim 32, characterized in that, The first diode is replaced with the fifth switch, the second diode is replaced with the sixth switch, the third diode is replaced with the seventh switch, the fourth diode is replaced with the eighth switch, the fifth diode is replaced with the ninth switch, the sixth diode is replaced with the tenth switch, the seventh diode is replaced with the eleventh switch, and the eighth diode is replaced with the twelfth switch.

40. The charging system according to claim 39, characterized in that, The leakage current suppression circuit further includes: Y capacitor; A preprocessing module, which is connected to the AC input side of the power grid, is adapted to generate the excitation source for the leakage current suppression module; A leakage current suppression module is disposed between the preprocessing module and the non-isolated charger, and is adapted to suppress the leakage current generated by the non-isolated charger.

41. The charging system according to claim 40, characterized in that, The preprocessing module includes: A rectifier unit, connected to the AC input side of the power grid, is adapted to convert the AC power supplied by the power grid into DC power; A DC-DC unit, which is connected to the rectifier unit, is adapted to perform voltage amplitude conversion on the direct current; A high-frequency inverter unit, which is connected to the DC-DC unit, is adapted to convert the direct current into high-frequency alternating current; A filtering unit is connected to the high-frequency inverter unit and is adapted to filter the high-frequency alternating current.

42. The charging system according to claim 41, characterized in that, The leakage current suppression module includes: A transformer, wherein the primary side of the transformer is connected to the filter unit, one side of the secondary side of the transformer is connected to the Y capacitor, and the other side of the secondary side of the transformer is connected to the non-isolated charger; A controller, connected to the high-frequency inverter module, is adapted to acquire leakage current sampling values ​​and adjust the output voltage of the high-frequency inverter module according to the leakage current sampling values.

43. A charging system, characterized in that, The system includes: An AC-DC conversion circuit is suitable for converting AC power supplied by the power grid into DC power to charge energy storage devices. The fourth switching module is adapted to change the connection mode between the power grid and the AC-DC conversion circuit so that the charging system can operate in single-phase AC charging mode or three-phase AC charging mode. A leakage current suppression circuit is provided to suppress the leakage current of the AC-DC conversion circuit.

44. The charging system according to claim 43, characterized in that, The fourth switch module includes a fifth switch, a sixth switch, a seventh switch, and an eighth switch. Phase A of the power grid is connected to the AC-DC conversion circuit through the fifth switch, phase B of the power grid is connected to the AC-DC conversion circuit through the sixth switch, phase C of the power grid is connected to the AC-DC conversion circuit through the seventh switch, and phase N of the power grid is connected to the AC-DC conversion circuit through the eighth switch.

45. The charging system according to claim 44, characterized in that, The AC-DC conversion circuit includes at least one electric drive unit, at least one inductor, and at least one switching transistor. The at least one electric drive unit is connected to the fourth switching module, the at least one inductor is connected to the leakage current suppression circuit, and the at least one switching transistor is disposed between the at least one inductor and the at least one electric drive unit.

46. ​​The charging system according to claim 45, characterized in that, The at least one electric drive unit includes a first electric drive unit and a second electric drive unit, wherein... The first electric drive unit is disposed between the fifth switch and the energy storage device, and the first electric drive unit includes a first three-phase bridge arm; The second electric drive unit is disposed between the sixth switch and the energy storage device, and the second electric drive unit includes a second three-phase bridge arm.

47. The charging system according to claim 46, characterized in that, The at least one switching transistor includes a fifth switching transistor, a sixth switching transistor, a seventh switching transistor, and an eighth switching transistor, wherein the fifth switching transistor and the sixth switching transistor constitute a first bridge arm, and the seventh switching transistor and the eighth switching transistor constitute a second bridge arm.

48. The charging system according to claim 47, characterized in that, The at least one inductor includes an eighth inductor and a ninth inductor, wherein the middle node of the first bridge arm is connected to the leakage current suppression circuit through the eighth inductor, and the middle node of the second bridge arm is connected to the leakage current suppression circuit through the ninth inductor.

49. The charging system according to claim 48, characterized in that, When the fifth switch and the eighth switch are configured to be in the ON state, and the first electric drive unit is configured to be connected to the fifth switch and the second electric drive unit is configured to be connected to the eighth switch, the charging system is configured to operate in single-phase AC charging mode.

50. The charging system according to claim 48, characterized in that, The system further includes a common-mode inductor, which is disposed between the fourth switching module and the AC-DC conversion circuit.

51. The charging system according to claim 50, characterized in that, When the fifth switch, the sixth switch, and the seventh switch are configured to be in the ON state, and the first electric drive unit is configured to be connected to the fifth switch and the second electric drive unit is configured to be connected to the sixth switch, the charging system is configured to operate in a three-phase AC charging mode.

52. The charging system according to claim 48, characterized in that, The at least one electric drive unit includes a third electric drive unit, wherein... The third electric drive unit is disposed between the seventh switch and the energy storage device, and the third electric drive unit includes a third three-phase bridge arm.

53. The charging system according to claim 52, characterized in that, When the fifth switch and the eighth switch are configured to be in the ON state, and the first electric drive unit is configured to be connected to the fifth switch and the second electric drive unit is configured to be connected to the eighth switch, the charging system is configured to operate in single-phase AC charging mode.

54. The charging system according to claim 53, characterized in that, When the fifth switch, the sixth switch, and the seventh switch are configured to be in the ON state, and the first electric drive unit is configured to be connected to the fifth switch, the second electric drive unit is configured to be connected to the sixth switch, and the third electric drive unit is configured to be connected to the seventh switch, the charging system is configured to operate in a three-phase AC charging mode.

55. The charging system according to claim 48, characterized in that, The leakage current suppression circuit is an active power frequency leakage current suppression circuit, which includes: Y capacitor; A filter, adapted to acquire an excitation source and filter the excitation source; A transformer, wherein the primary side of the transformer is connected to the filter, one side of the secondary side of the transformer is connected to the Y capacitor, and the other side of the secondary side of the transformer is connected to the at least one electric drive unit; A controller, connected to at least one switching transistor, is adapted to acquire a leakage current sampling value and adjust the duty cycle of the at least one switching transistor according to the leakage current sampling value.

56. The charging system according to claim 49 or 53, characterized in that, When the charging system operates in single-phase AC charging mode, the first three-phase bridge arm is configured to be connected in parallel as an A-phase half-bridge, and the second three-phase bridge arm is configured to be connected in parallel as an N-phase half-bridge. The A-phase half-bridge and the N-phase half-bridge are configured to have their upper tube of the A-phase half-bridge and lower tube of the N-phase half-bridge switched synchronously, and their lower tube of the A-phase half-bridge and upper tube of the N-phase half-bridge switched synchronously.

57. The charging system according to claim 54, characterized in that, When the charging system operates in three-phase AC charging mode, the fifth, sixth, seventh, and eighth switches are configured to be in the off state.

58. An energy storage system, characterized in that, include: Energy storage devices; The charging system as described in any one of claims 1-11, or the charging system as described in any one of claims 12-25, or the charging system as described in any one of claims 26-42, or the charging system as described in any one of claims 43-57; the charging system or the charging system is connected to the energy storage device.

59. A vehicle, characterized in that, include: The charging system as described in any one of claims 1-11, or the charging system as described in any one of claims 12-25, or the charging system as described in any one of claims 26-42, or the charging system as described in any one of claims 43-57.

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