Charging system, charging control method, controller and vehicle

Abstract

A charging system, comprising a charging circuit (201) and a controller (202). The charging circuit (201) comprises: an inductive element (2011), a bridge arm module (2012) and a switch assembly (2013). The charging system is used for charging a power battery (300). One end of the switch assembly (2013) is adapted to connect to a power supply apparatus (400), and the other end thereof is electrically connected to a first end of the inductive element (2011). A second end of the inductive element (2011) is adapted to connect to the power battery (300) by means of the bridge arm module (2012). The controller (202) is used for controlling the switch assembly (2013) and the bridge arm module (2012) on the basis of a target charging mode, so as to charge the power battery (300) by means of the power supply apparatus (400) and / or the inductive element (2011). The charging system can be compatible with power supply apparatuses having different voltages without addition of an additional circuit structure. Further provided are a charging control method, a controller implementing the charging control method, and a vehicle comprising the controller or the charging system.

Description

Charging system, charging control method, controller and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] The present disclosure claims priority to Chinese patent applications filed with the Patent Office of China on January 31, 2024, with application number 202410144741.0, entitled “Charging control method, charging system, controller and vehicle”, filed with the Patent Office of China on January 31, 2024, with application number 202410144725.1, entitled “Charging device and electric equipment”, and filed with the Patent Office of China on February 1, 2024, with application number 202410144877.1, entitled “A charging system and electric vehicle”, the entire contents of which are incorporated by reference into the present disclosure. Technical Field

[0003] The present disclosure relates to the field of vehicle technology, and in particular to a charging system, a charging control method, a controller, and a vehicle. Background Art

[0004] The voltage range of power batteries of different models is getting wider and wider, the charging power requirements are also uneven, and the output capacity of charging piles from different manufacturers is different. It is necessary to charge the power battery by boosting or stepping down the voltage. Before the power battery is officially charged, the pre-charge capacitor needs to be pre-charged through the capacitor pre-charge circuit to protect the power battery from being damaged by large current. Summary of the Invention

[0005] The purpose of the present disclosure is to provide a charging system, a charging control method, a controller and a vehicle, so as to overcome the problems existing in the related art.

[0006] According to a first aspect of an embodiment of the present disclosure, a charging system is provided, the charging system comprising a charging circuit and a controller, the charging circuit being connected to the controller, the charging circuit comprising: an inductive element, a bridge arm module, and a switch assembly, the charging system being used to charge a power battery;

[0007] One end of the switch assembly is suitable for connecting to the power supply device, and the other end is connected to the first end of the inductive element; the second end of the inductive element is suitable for connecting to the power battery through the bridge arm module;

[0008] The controller is used to control the switch component and the bridge arm module according to the target charging mode to charge the power battery through the power supply device and / or the inductive element. The target charging mode includes: at least one of a boost charging mode, a buck charging mode and a direct charging mode.

[0009] Optionally, the controller is further configured to:

[0010] The target charging mode is determined from preset charging modes according to the output voltage of the power supply device and the battery voltage of the power battery.

[0011] Optionally, the switch assembly includes a first switch assembly and a second switch assembly;

[0012] The power battery is suitable for being connected to the power supply device through the first switch component and the second switch component. The power battery is also suitable for being connected to the bridge arm module through the first switch component. The inductive element is suitable for being connected to the power supply device through the second switch component.

[0013] Optionally, the charging circuit further includes: a pre-charge capacitor;

[0014] The pre-charge capacitor is suitable for being connected in parallel with the power battery through the first switch assembly, and the pre-charge capacitor is also connected to the bridge arm module;

[0015] The controller is used to control the switch component and the bridge arm module according to the target charging mode, so as to pre-charge the pre-charge capacitor through the power supply device and / or the inductive element.

[0016] Optionally, the charging circuit further includes: a filter capacitor;

[0017] One end of the filter capacitor is connected to the bridge arm module, and the other end of the filter capacitor is connected to the inductive element.

[0018] Optionally, the first end of the pre-charge capacitor is connected to the upper bridge arm of the bridge arm module, the second end of the pre-charge capacitor is connected to the lower bridge arm of the bridge arm module, the midpoint of the bridge arm of the bridge arm module is connected to the first end of the inductive element, and the second end of the inductive element is connected to the second switch component; the upper bridge arm of the bridge arm module is also connected to the second switch component, and the lower bridge arm of the bridge arm module is also connected to the second switch component.

[0019] Optionally, the first switch assembly includes: a first contactor, a second contactor and a third contactor; the second switch assembly includes: a first switch tube, a second switch tube and a fourth contactor;

[0020] The first end of the first contactor is suitable for connecting to the first end of the power battery, and the second end of the first contactor is connected to the first end of the pre-charge capacitor;

[0021] The first end of the second contactor is suitable for connecting to the second end of the power battery, and the second end of the second contactor is connected to the second end of the pre-charge capacitor;

[0022] The first end of the third contactor is suitable for connecting to the first end of the power battery, and the second end of the third contactor is connected to the second end of the inductive element;

[0023] The first end of the first switch tube is connected to the upper bridge arm of the bridge arm module, and the second end of the first switch tube is suitable for connecting to the first end of the power supply device;

[0024] The first end of the fourth contactor is connected to the lower bridge arm of the bridge arm module, and the second end of the fourth contactor is suitable for connecting to the second end of the power supply device;

[0025] The first end of the second switching tube is connected to the second end of the inductive element, and the second end of the second switching tube is suitable for being connected to the first end of the power supply device.

[0026] Optionally, the controller is specifically configured to:

[0027] closing the fourth contactor, turning on the second switch tube, and disconnecting the first contactor, the second contactor, the third contactor, and the first switch tube;

[0028] Periodically controlling the switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module to be alternately turned on, so as to boost and pre-charge the pre-charge capacitor according to the boost charging mode;

[0029] The controller is specifically used for:

[0030] closing the first contactor, the second contactor, the fourth contactor, and the second switch tube, and opening the third contactor and the first switch tube;

[0031] The upper bridge and the lower bridge of the bridge arm module are periodically controlled to be alternately turned on, so as to boost charge the power battery according to the boost charging mode.

[0032] Optionally, the controller is specifically configured to:

[0033] Closing the fourth contactor to turn on the switch tube of the upper bridge arm of the bridge arm module, and disconnecting the first contactor, the second contactor, the third contactor, the first switch tube, and the switch tube of the lower bridge arm of the bridge arm module;

[0034] Periodically turning on the second switch tube to perform voltage reduction pre-charging for the pre-charge capacitor according to the voltage reduction charging mode;

[0035] The controller is specifically used for:

[0036] closing the second contactor, the third contactor, the first switch tube and the fourth contactor, and opening the first contactor and the second switch tube;

[0037] The switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module are periodically controlled to be alternately turned on, so as to perform step-down charging for the power battery according to the step-down charging mode.

[0038] Optionally, the controller is specifically configured to:

[0039] closing the fourth contactor, and opening the first contactor, the second contactor, the third contactor, the second switch tube, and the switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module;

[0040] Periodically turning on the first switch to pre-charge the pre-charge capacitor in a direct charging mode;

[0041] The controller is specifically used for:

[0042] closing the first contactor, the second contactor, and the fourth contactor, and opening the third contactor, the second switch tube, and the switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module;

[0043] The first switch tube is periodically turned on, and after the output voltage of the power supply device is maintained in a preset voltage range, the first switch tube is kept turned on to directly charge the power battery in the direct charging mode.

[0044] Optionally, the switch assembly includes: a switch tube;

[0045] One end of the switch tube is adapted to be electrically connected to the power supply device via the charging port, and the other end is connected to the first end of the inductive element;

[0046] The second end of the inductive element is suitable for being electrically connected to the power battery through the bridge arm module;

[0047] The controller is used to:

[0048] When the charging system operates in a boost charging mode, the operating state of the switch tube is controlled, and a boost charging circuit is formed using the inductive element and the bridge arm module to boost the voltage received by the charging port to charge the power battery;

[0049] When the charging system operates in the step-down charging mode, the working state of the switch component is controlled, and the inductive element and the bridge arm module are used to form a step-down charging circuit to reduce the voltage received by the charging port and charge the power battery.

[0050] Optionally, the switch assembly includes: a first switch tube and a second switch tube;

[0051] The first end of the first switch tube is adapted to be electrically connected to the first end of the charging port;

[0052] The second end of the first switching tube is electrically connected to the first end of the inductive element;

[0053] The first end of the second switch tube is electrically connected to the first end of the inductive element;

[0054] The second end of the second switch tube is adapted to be electrically connected to the second end of the charging port;

[0055] The second end of the first switching tube is electrically connected to the first end of the second switching tube, and the electrical connection point is electrically connected to the first end of the inductive element.

[0056] Optionally, the charging system further comprises: a filter capacitor;

[0057] One end of the filter capacitor is electrically connected to the first end of the inductive element, and the other end is electrically connected to the negative terminal of the bridge arm module;

[0058] The filter capacitor is used to filter the electric energy received by the charging port.

[0059] Optionally, the charging system further includes: a fifth contactor or a fourth contactor;

[0060] One end of the fifth contactor is electrically connected to the second end of the switch tube, and the other end is connected to the first end of the inductive element;

[0061] The fifth contactor is used to control the on / off of the circuit between the second end of the switch tube and the first end of the inductive element;

[0062] One end of the fourth contactor is electrically connected to the negative end of the bridge arm module, and the other end is suitable for being electrically connected to the second end of the charging port;

[0063] The fourth contactor is used to control the on / off of the circuit between the charging port and the negative terminal of the bridge arm module.

[0064] Optionally, the first switch tube includes: a first field effect tube; the second switch tube includes: a second field effect tube;

[0065] The first end of the first field effect transistor is adapted to be electrically connected to the first end of the charging port, the third end is adapted to receive a first control signal, and the second end is electrically connected to the first end of the inductive element;

[0066] The first end of the second field effect tube is electrically connected to the first end of the inductive element, the third end is suitable for receiving the second control signal, and the second end is electrically connected to the second end of the charging port and the negative terminal of the power battery respectively.

[0067] Optionally, the inductive element includes: N-phase windings; the bridge arm module includes: N bridge arms connected in parallel;

[0068] The first end of the N-phase winding is electrically connected to the other end of the switch tube;

[0069] The second ends of the N-phase windings are connected to the midpoints of the N bridge arms in a one-to-one correspondence, where N is an integer greater than or equal to 1.

[0070] Optionally, the controller is specifically configured to:

[0071] When the charging system operates in a boost charging mode, the first switch tube is controlled to be closed, the second switch tube is controlled to be opened, and the upper bridge of each of the N bridge arms is controlled to be closed, and the lower bridge of at least one bridge arm is controlled to be turned on for a first preset time, so that the electric energy received by the charging port is used to charge the N-phase winding;

[0072] After the first preset time has passed, the lower bridges of the N bridge arms are controlled to be closed and the upper bridge of at least one bridge arm is turned on, so that the charging port and the N-phase winding jointly charge the power battery;

[0073] The above process is repeated until charging is completed.

[0074] Optionally, the controller is specifically configured to:

[0075] When the charging system operates in the step-down charging mode, in the first stage, the first switch tube is controlled to be closed, the second switch tube is controlled to be open, and the lower bridge of each of the N bridge arms is controlled to be closed and the upper bridge of at least one bridge arm is controlled to be turned on, so that the charging port charges the N-phase winding and the power battery simultaneously;

[0076] In the second stage, the first switch tube is controlled to be off, the second switch tube is controlled to be on, and the lower bridge of each of the N bridge arms is controlled to be off and the upper bridge of at least one bridge arm is controlled to be on, so that the N-phase winding is freewheeling to reduce the voltage and charge the power battery;

[0077] The above process is repeated until charging is completed.

[0078] Optionally, the charging system further comprises: a pre-charging capacitor, a first contactor and a second contactor;

[0079] The pre-charge capacitor is electrically connected to the positive terminal and the negative terminal of the power battery;

[0080] The controller is specifically used for:

[0081] When the charging system operates in the boost pre-charging mode, the first switch tube is controlled to be closed, the second switch tube is controlled to be disconnected, the first contactor and the second contactor are controlled to be disconnected, and the upper bridge of each of the N bridge arms is controlled to be closed, and the lower bridge of at least one bridge arm is controlled to be turned on for a second preset time, so that the electric energy received by the charging port or the electric energy provided by the in-vehicle power supply is used to charge the three-phase winding;

[0082] After the second preset time, the lower bridges of the N bridge arms are controlled to be closed and the upper bridge of at least one bridge arm is turned on, so that the power received by the charging port or the power provided by the in-vehicle power supply and the three-phase winding freewheeling jointly charge the pre-charge capacitor, and this process is repeated until the difference between the voltage of the pre-charge capacitor and the current real-time voltage of the power battery is within a preset range;

[0083] When the charging system operates in the buck pre-charging mode, in the first stage, the first contactor and the second contactor are controlled to be disconnected, the first switch tube is closed, the second switch tube is disconnected, and the lower bridge of each of the N bridge arms is controlled to be closed and the upper bridge of at least one bridge arm is turned on. Then, the electric energy received by the charging port or the electric energy provided by the in-vehicle power supply is used to charge the N-phase winding and the pre-charging capacitor simultaneously;

[0084] In the second stage, the first contactor and the second contactor are controlled to be disconnected, the first switch tube is turned off, and the second switch tube is closed. The lower bridge of each of the N bridge arms is controlled to be closed, and the upper bridge of at least one bridge arm is turned on. Then, the N-phase winding continues to freewheel to reduce the voltage of the pre-charge capacitor and charge it. This process is repeated until the difference between the voltage of the pre-charge capacitor and the current real-time voltage of the power battery is within a preset range.

[0085] When the charging system operates in the direct pre-charging mode, the first switch tube is controlled to be closed, the second switch tube is controlled to be disconnected, the first contactor and the second contactor are controlled to be disconnected, and the lower bridge of each of the N bridge arms is controlled to be closed, and the upper bridge of at least one bridge arm is controlled to be turned on. Then, the electric energy received by the charging port or the electric energy provided by the in-vehicle power supply is input to the pre-charging capacitor through the N-phase winding and the upper bridge of the at least one bridge arm, and the pre-charging capacitor is directly charged until the voltage of the pre-charging capacitor is within a preset range of the current real-time voltage of the power battery.

[0086] Optionally, the power supply device includes a DC power supply;

[0087] The first end of the bridge arm module is suitable for being connected to the positive electrode of the power battery, the second end of the bridge arm module is suitable for being connected to the negative electrode of the power battery, the first end of the inductive element is suitable for being connected to the DC power supply through the switch assembly, the midpoint of the bridge arm of the bridge arm module is connected to the second end of the inductive element; and the second end of the bridge arm module is suitable for being connected to the DC power supply;

[0088] When the charging system operates in a boost mode, the controller controls the switching state of the switch component so that the bridge arm module and the inductive element form a boost circuit;

[0089] When the charging system operates in a step-down mode, the controller controls the switching state of the switch component so that the bridge arm module and the inductive element form a step-down circuit.

[0090] Optionally, the switch assembly includes a first contactor and a second contactor, the positive pole of the power battery is suitable for connecting to the first end of the first contactor, the second end of the first contactor is connected to the first end of the bridge arm module, the negative pole of the power battery is suitable for connecting to the first end of the second contactor, and the second end of the second contactor is connected to the second end of the bridge arm module.

[0091] Optionally, the switch assembly also includes: a third contactor, a sixth contactor, and a seventh contactor, the first end of the first contactor being connected to the first end of the third contactor, the second end of the first contactor being connected to the first end of the seventh contactor, the second end of the seventh contactor being suitable for connecting the positive pole of the DC power supply and the first end of the sixth contactor, the second end of the third contactor being connected to the second end of the sixth contactor, the second end of the sixth contactor being suitable for connecting to the first end of the inductive element, and the negative pole of the DC power supply being suitable for connecting to the second end of the bridge arm module.

[0092] Optionally, the charging system further includes a pre-charge capacitor, the second end of the first contactor is connected to the first end of the pre-charge capacitor, and the second end of the second contactor is connected to the second end of the pre-charge capacitor.

[0093] Optionally, the bridge arm module includes N bridge arm units in parallel, each bridge arm unit includes an upper bridge switch tube and a lower bridge switch tube connected in series; the inductive element includes N inductors; the first ends of the N inductors are connected to the second end of the sixth contactor, and the second ends of the N inductors are connected one-to-one with the bridge arm midpoints of the N bridge arm units, the bridge arm midpoint of each bridge arm unit is the connection point of the upper bridge switch tube and the lower bridge switch tube of each bridge arm unit, and N is an integer greater than or equal to 1.

[0094] Optionally, the switch assembly further comprises: a fourth contactor and a fifth contactor;

[0095] The negative electrode of the DC power supply is suitable for connecting to the first end of the fourth contactor, and the second end of the fourth contactor is connected to the second end of the second contactor;

[0096] The second end of the sixth contactor is connected to the first end of the fifth contactor, and the second end of the fifth contactor is connected to the first end of the inductive element.

[0097] Optionally, the charging system further includes a filter capacitor, a first end of the filter capacitor is connected to the second end of the sixth contactor, and a second end of the filter capacitor is connected to the second end of the fourth contactor.

[0098] Optionally, the controller controls the switching state of the switch component so that the bridge arm module and the inductive element form a boost circuit, including:

[0099] In a first stage, the controller controls the sixth contactor, the fourth contactor, and the fifth contactor to be closed, the third contactor and the seventh contactor to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and N upper bridge switch tubes of the bridge arm module to be turned off, so that the DC power supply charges the inductive element;

[0100] In the second stage, the controller controls the first contactor, the second contactor, the sixth contactor, the fourth contactor, and the fifth contactor to be closed, the third contactor and the seventh contactor to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be turned off, so that the DC power supply and the inductive element charge the power battery.

[0101] Optionally, the controller controls the switching state of the switch component so that the bridge arm module and the inductive element form a step-down circuit, including:

[0102] In a first stage, the controller controls the second contactor, the third contactor, the seventh contactor, the fourth contactor, and the fifth contactor to be closed, the first contactor and the sixth contactor to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and N lower bridge switch tubes of the bridge arm module to be turned off, so that the DC power supply charges the inductive element and the power battery;

[0103] In the second stage, the controller controls the second contactor, the third contactor, and the fifth contactor to be closed, the first contactor and the sixth contactor to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and N upper bridge switch tubes of the bridge arm module to be turned off, so that the inductive element charges the power battery.

[0104] Optionally, when the charging system operates in a pre-charging mode, the controller controls the switching state of the switch component so that the bridge arm module and the inductive element form a pre-charging circuit.

[0105] Optionally, when the charging system operates in a pre-charging mode, the controller controls the switching state of the switch component so that the bridge arm module and the inductive element form a pre-charging circuit, including:

[0106] In the first stage, the controller controls the sixth contactor, the fourth contactor, and the fifth contactor to be closed, the first contactor, the second contactor, the third contactor, and the seventh contactor to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and N upper bridge switch tubes of the bridge arm module to be turned off, so that the DC power supply charges the inductive element;

[0107] In the second stage, the controller controls the sixth contactor, the fourth contactor, and the fifth contactor to be closed, the first contactor, the second contactor, the third contactor, and the seventh contactor to be disconnected, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be disconnected, so that the DC power supply and the inductive element charge the pre-charge capacitor.

[0108] According to a second aspect of an embodiment of the present disclosure, a charging control method is provided, the method comprising:

[0109] Determining a target charging mode from preset charging modes according to the output voltage of the power supply device and the battery voltage of the power battery, wherein the preset charging mode includes at least one of a boost charging mode, a buck charging mode, and a direct charging mode;

[0110] According to the target charging mode, the switch assembly and the energy storage module are controlled to charge the power battery through the power supply device and / or the energy storage module.

[0111] According to a third aspect of an embodiment of the present disclosure, there is provided a controller, including:

[0112] a memory having a computer program stored thereon;

[0113] A processor is used to execute the computer program in the memory to implement the steps of the method described in the second aspect of the embodiment of the present disclosure.

[0114] According to a fourth aspect of an embodiment of the present disclosure, a vehicle is provided, comprising the controller described in the second aspect of an embodiment of the present disclosure, or the charging system described in the first aspect of an embodiment of the present disclosure.

[0115] Through the above technical solution, the charging system in the present disclosure includes a charging circuit and a controller, and the charging circuit is connected to the controller. The charging circuit includes: an inductive element, a bridge arm module and a switch assembly, and the charging system is used to charge the power battery. One end of the switch assembly is suitable for being connected to the power supply device, and the other end is electrically connected to the first end of the inductive element, and the second end of the inductive element is suitable for being connected to the power battery through the bridge arm module. The controller controls the switch assembly and the bridge arm module according to the target charging mode to charge the power battery through the power supply device and / or the inductive element. The target charging mode includes at least one of a boost charging mode, a buck charging mode and a direct charging mode. The present disclosure reuses the original inductive element and bridge arm module of the vehicle to pre-charge the pre-charge capacitor and charge the power battery according to the target charging mode, and can be compatible with power supply devices of different voltages without adding additional circuit structures.

[0116] Additional aspects and advantages of the present disclosure will be given in part in the description below and in part will be obvious from the description below, or will be learned through practice of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0117] The above and / or additional aspects and advantages of the present disclosure will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0118] FIG1 is a block diagram of a charging system according to an exemplary embodiment;

[0119] FIG2 is a block diagram of another charging system according to an exemplary embodiment;

[0120] FIG3 is a schematic diagram of a charging system according to an exemplary embodiment;

[0121] FIG4 is a schematic diagram showing a flow of charging current according to an exemplary embodiment;

[0122] FIG5 is a schematic diagram showing another charging current flow direction according to an exemplary embodiment;

[0123] FIG6 is a schematic diagram showing another charging current flow direction according to an exemplary embodiment;

[0124] FIG7 is a schematic diagram showing another charging current flow direction according to an exemplary embodiment;

[0125] FIG8 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0126] FIG9 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0127] FIG10 is a schematic diagram showing another charging current flow direction according to an exemplary embodiment;

[0128] FIG11 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0129] FIG12 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0130] FIG13 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0131] FIG14 is a schematic structural diagram of a charging system according to an exemplary embodiment;

[0132] FIG15 is a schematic structural diagram of another charging system according to an exemplary embodiment;

[0133] FIG16 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0134] FIG17 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0135] FIG18 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0136] FIG19 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0137] FIG20 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0138] FIG21 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0139] FIG22 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0140] FIG23 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0141] FIG24 is a schematic structural diagram of another charging system according to an exemplary embodiment;

[0142] FIG25 is a schematic structural diagram of another charging system according to an exemplary embodiment;

[0143] FIG26 is a schematic diagram showing a flow of charging current according to an exemplary embodiment;

[0144] FIG27 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0145] FIG28 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0146] FIG29 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0147] FIG30 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0148] FIG31 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0149] FIG32 is a schematic diagram showing another charging current flow according to an exemplary embodiment;

[0150] FIG33 is a flow chart showing a charging control method according to an exemplary embodiment;

[0151] FIG34 is a flow chart showing another charging control method according to an exemplary embodiment;

[0152] FIG35 is a flow chart showing another charging control method according to an exemplary embodiment;

[0153] FIG36 is a flow chart showing another charging control method according to an exemplary embodiment;

[0154] FIG37 is a flow chart showing another charging control method according to an exemplary embodiment;

[0155] FIG38 is a block diagram of a controller according to an exemplary embodiment;

[0156] FIG39 is a block diagram of a vehicle according to an exemplary embodiment;

[0157] FIG40 is a block diagram of another vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0158] The following describes in detail embodiments of the present disclosure, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present disclosure, and should not be construed as limiting the present disclosure.

[0159] The inventors have discovered that the voltage range of power batteries in different models of electric vehicles is increasingly widening, and the power required for charging is also varying. Due to differences in the output capacity of charging piles from different manufacturers, some high-voltage models cannot be charged at charging piles with lower output voltages, or high-output charging piles cannot deliver their maximum power to charge low-voltage electric vehicles.

[0160] The inventors further discovered that most manufacturers use direct charging, while some use boost charging, which is compatible with charging piles with low output voltages. However, few offer step-down charging. For charging piles with high output voltages, the high-voltage charging piles have low output power, failing to maximize output and failing to effectively charge low-voltage electric vehicles.

[0161] After further in-depth research, the inventor creatively discovered that the very few system structures that are currently compatible with buck-boost charging cannot switch between buck and boost smoothly. This is because the current flow direction of the circuit loop in their structure is opposite during boost charging and buck charging. Therefore, when switching from boost to buck, or from buck to boost, an energy release process is required. The switching can only be achieved after the electric energy is released. This not only causes a waste of electric energy, but also leads to increased charging costs and longer charging times, giving users a poor charging experience.

[0162] In the related art, it is necessary to add additional buck-boost circuits to achieve boost charging or buck charging, and to pre-charge the pre-charge capacitor through the power battery, it is also necessary to add additional pre-charge branches and corresponding components, resulting in high circuit complexity and increased production costs.

[0163] The present invention reuses the vehicle's original inductive elements and bridge arm modules to pre-charge the pre-charge capacitor and charge the power battery according to the target charging mode. It can be compatible with power supply devices of different voltages without adding additional circuit structures. The pre-charge capacitor is pre-charged through the power supply device without adding additional pre-charging branches, which simplifies the circuit structure and reduces production costs.

[0164] Figure 1 is a block diagram of a charging system according to an exemplary embodiment. As shown in Figure 1, the charging system 200 includes a charging circuit 201 and a controller 202. The charging circuit 201 is connected to the controller 202. The charging circuit 201 includes: an inductive element 2011, a bridge arm module 2012 and a switch component 2013. The charging system 200 is used to charge the power battery 300.

[0165] One end of the switch component 2013 is suitable for connecting to the power supply device 400 , and the other end is connected to the first end of the inductive element 2011 . The second end of the inductive element 2011 is suitable for connecting to the power battery 300 through the bridge arm module 2012 .

[0166] The controller 202 is used to control the switch component 2013 and the bridge arm module 2012 according to the target charging mode to charge the power battery 300 through the power supply device 400 and / or the inductive element 2011. The target charging mode includes: at least one of: a boost charging mode, a buck charging mode and a direct charging mode.

[0167] For example, the power supply device 400 in the present disclosure can be a charging pile or a DC power supply, such as a battery, which is not specifically limited in the present disclosure. The present disclosure can be applied to a charging circuit 201, wherein the charging circuit 201 can include a pre-charge capacitor, a switch component 2013, an inductive element 2011, and a bridge arm module 2012. The pre-charge capacitor and the power battery 300 can be connected in parallel. One end of the switch component 2013 is suitable for connection to the power supply device 400, and the other end is electrically connected to the first end of the inductive element 2011. The second end of the inductive element 2011 is suitable for connection to the power battery 300 through the bridge arm module 2012. The bridge arm module 2012 can be a three-phase inverter circuit in the motor controller 202, and the inductive element 2011 can be an inductor in the motor, thereby realizing functional reuse of the motor controller 202 and the motor module, simplifying the circuit structure and reducing production costs.

[0168] In some embodiments, since the output voltage of the power supply device 400 and the battery voltage of the power battery 300 do not necessarily match, after the power supply device 400 is connected to the charging circuit 201, a corresponding target charging mode can be determined from preset charging modes based on the relationship between the output voltage of the power supply device 400 and the battery voltage of the power battery 300. The preset charging mode may include at least one of a boost charging mode, a buck charging mode, and a direct charging mode.

[0169] In other embodiments, when the output voltage of the power supply device 400 is lower than the battery voltage of the power battery 300, the boost charging mode can be used as the target charging mode; when the output voltage of the power supply device 400 is higher than the battery voltage of the power battery 300, and the difference between the output voltage and the battery voltage is higher than the first preset voltage threshold and lower than the second preset voltage threshold, the direct charging mode can be used as the target charging mode; when the output voltage of the power supply device 400 is higher than the battery voltage of the power battery 300, and the difference between the output voltage and the battery voltage is higher than the second preset voltage threshold, the buck charging mode can be used as the target charging mode.

[0170] In other embodiments, when the target charging mode is the boost charging mode, the power battery 300 can be charged jointly by the power supply device 400 and the inductive element 2011, thereby achieving boost charging of the power battery 300; when the target charging mode is the buck charging mode, the power battery 300 can be charged by the inductive element 2011, thereby achieving buck charging of the power battery 300; when the target charging mode is the direct charging mode, the power battery 300 can be charged by the power supply device 400, thereby achieving direct charging of the power battery 300.

[0171] In this way, when the output voltage of the power supply device 400 is lower than the charging voltage of the power battery 300, the power battery 300 can be boosted and charged through the boost charging mode; when the output voltage of the power supply device 400 is greater than the charging voltage of the power battery 300, the power battery 300 can be bucked and charged through the buck charging mode, so that the power supply device 400 can output as much power as possible, thereby reducing the charging time; when the output voltage of the power supply device 400 meets the charging voltage of the power battery 300, the power battery 300 can be directly charged through the direct charging mode, so that it can be compatible with power supply devices 400 of different voltages, thereby improving the charging flexibility and the adaptability of the power battery 300 and the power supply device 400.

[0172] In some embodiments, since the output voltage of the power supply device 400 and the battery voltage of the power battery 300 do not necessarily match, after the power supply device 400 is connected to the charging circuit 201, a corresponding target charging mode can be determined from preset charging modes based on the relationship between the output voltage of the power supply device 400 and the battery voltage of the power battery 300. The preset charging mode may include at least one of a boost charging mode, a buck charging mode, and a direct charging mode.

[0173] In other embodiments, when the output voltage of the power supply device 400 is lower than the battery voltage of the power battery 300, the boost charging mode can be used as the target charging mode; when the output voltage of the power supply device 400 is higher than the battery voltage of the power battery 300, and the difference between the output voltage and the battery voltage is higher than the first preset voltage threshold and lower than the second preset voltage threshold, the direct charging mode can be used as the target charging mode; when the output voltage of the power supply device 400 is higher than the battery voltage of the power battery 300, and the difference between the output voltage and the battery voltage is higher than the second preset voltage threshold, the buck charging mode can be used as the target charging mode.

[0174] FIG2 is a block diagram of another charging system according to an exemplary embodiment. As shown in FIG2 , the switch component 2013 includes a first switch component 2013 a and a second switch component 2013 b ;

[0175] The power battery 300 is suitable for connecting to the power supply device 400 through the first switch component 2013a and the second switch component 2013b. The power battery 300 is also suitable for connecting to the bridge arm module 2012 through the first switch component 2013a. The inductive element 2011 is suitable for connecting to the power supply device 400 through the second switch component 2013b.

[0176] FIG3 is a schematic diagram of a charging system according to an exemplary embodiment. As shown in FIG3 , charging circuit 201 may further include a pre-charge capacitor C1. The first end of pre-charge capacitor C1 is further connected to the upper arm of bridge module 2012. The second end of pre-charge capacitor C1 is connected to the lower arm of bridge module 2012. The midpoint of the bridge arm of bridge module 2012 is connected to the first end of inductive element 2011. The second end of inductive element 2011 is connected to second switch component 2013 b. The upper arm of bridge module 2012 is further connected to second switch component 2013 b, and the lower arm of bridge module 2012 is further connected to second switch component 2013 b.

[0177] The bridge arm midpoint can be understood as the location of the connection line between the upper and lower bridge arm switches of the bridge arm module. The bridge arm module 2012 can be a circuit in a motor controller, and the inductive element 2011 can be an inductive element 2011 of the motor. This allows for functional reuse of the motor controller and the motor module, simplifies circuit construction, and reduces production costs.

[0178] The controller 202 is configured to control the switch component 2013 and the bridge arm module 2012 according to a target charging mode, so as to pre-charge the pre-charge capacitor C1 through the power supply device 400 and / or the inductive element 2011 .

[0179] For example, different charging modes correspond to different switch states in the charging circuit, where the switch states include the states of the various switches in the switch assembly 2013 and the states of the various switches in the bridge arm module 2012. After determining the target charging mode, the states of the various switches in the switch assembly 2013 and the states of the various switches in the bridge arm module 2012 can be controlled according to the target charging mode, thereby pre-charging the pre-charge capacitor C1 through the power supply device 400 and / or the inductive element 2011.

[0180] In other embodiments, when the target charging mode is the boost charging mode, the pre-charge capacitor C1 can be pre-charged by the power supply device 400 and the inductive element 2011, thereby achieving boost pre-charging of the pre-charge capacitor C1; when the target charging mode is the buck charging mode, the pre-charge capacitor C1 can be pre-charged by the inductive element 2011, thereby achieving buck pre-charging of the pre-charge capacitor C1; when the target charging mode is the direct charging mode, the pre-charge capacitor C1 can be pre-charged by the power supply device 400, thereby achieving direct pre-charging of the pre-charge capacitor C1.

[0181] As shown in FIG3 , the charging circuit 201 further includes a filter capacitor C2 .

[0182] One end of the filter capacitor C2 is connected to the bridge arm module 2011 , and the other end of the filter capacitor C2 is connected to the inductive element 2011 .

[0183] The filter capacitor C2 can reduce the ripple voltage output by the power supply device 400 and play a role in voltage stabilization.

[0184] As shown in FIG3 , taking the power supply device 400 as a charging pile as an example, the first switch component 2013a includes: a first switch K1, a second switch K2, and a third switch K3. The second switch component 2013b includes: a fourth switch K4, a fifth switch K5, and a sixth switch K6.

[0185] The first end of the first contactor K1 is suitable for being connected to the first end of the power battery 300 , and the second end of the first contactor K1 is connected to the first end of the pre-charge capacitor C1 .

[0186] The first end of the second contactor K2 is suitable for being connected to the second end of the power battery 300 , and the second end of the second contactor K2 is connected to the second end of the pre-charge capacitor C1 .

[0187] A first end of the third contactor K3 is suitable for being connected to a first end of the power battery 300 , and a second end of the third contactor K3 is connected to a second end of the inductive element 2011 .

[0188] A first end of the first switch tube K4 is connected to the upper bridge arm of the bridge arm module 2012 , and a second end of the first switch tube K4 is suitable for being connected to a first end of the power supply device 400 .

[0189] A first end of the second switch tube K5 is connected to the lower bridge arm of the bridge arm module 2012 , and a second end of the second switch tube K5 is suitable for being connected to a second end of the power supply device 400 .

[0190] A first end of the fourth contactor K6 is connected to the second end of the inductive element 2011 , and a second end of the fourth contactor K6 is suitable for being connected to a first end of the power supply device 400 .

[0191] For example, the first contactor K1, the second contactor K2, the third contactor K3 and the second switch tube K5 can be contactors, and the first switch tube K4 and the fourth contactor K6 can be switches, thereby achieving high-frequency control of the first switch tube K4 and the fourth contactor K6.

[0192] The pre-charge resistor and contactor in the related art are connected in parallel with the first contactor K1, and the power battery pre-charges the pre-charge capacitor through the branch containing the pre-charge resistor and contactor. In the disclosed embodiment, the pre-charge capacitor in the related art can be replaced with the pre-charge capacitor C1 to simplify the circuit and reduce costs. Alternatively, the pre-charge capacitor in the related art can be retained as a redundant circuit design to improve the reliability of the charging system.

[0193] According to some embodiments of the present disclosure, the controller 202 is specifically configured to:

[0194] The second switch tube K5 is closed, the fourth contactor K6 is turned on, and the first contactor K1, the second contactor K2, the third contactor K3 and the first switch tube K4 are turned off.

[0195] The switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 are periodically controlled to be alternately turned on, so as to boost and pre-charge the pre-charge capacitor C1 in a boost charging mode.

[0196] For example, when the target charging mode is the boost charging mode, as shown in Figure 4, in step one, the second switch tube K5 can be closed, the fourth contactor K6 and the switch tube of the lower bridge arm of the bridge arm module 2012 can be turned on, and the first contactor K1, the second contactor K2, the third contactor K3, the first switch tube K4 and the switch tube of the upper bridge arm of the bridge arm module 2012 can be disconnected to charge the inductive element 2011 through the power supply device 400. As shown in Figure 5, in step 2, the second switch tube K5 can be kept closed, the fourth contactor K6 can be turned on, and the first contactor K1, the second contactor K2, the third contactor K3 and the first switch tube K4 can be disconnected, and the switch tube of the lower bridge arm of the bridge arm module 2012 can be disconnected, and the switch tube of the upper bridge arm of the bridge arm module 2012 can be turned on, so as to utilize the freewheeling effect of the inductive element 2011 and charge the pre-charge capacitor C1 simultaneously through the power supply device 400 and the inductive element 2011, thereby realizing the boost pre-charging of the pre-charge capacitor C1.

[0197] In some embodiments, step one and step two can be repeated periodically, that is, the second switch tube K5 is kept closed, the fourth contactor K6 is turned on, and the first contactor K1, the second contactor K2, the third contactor K3 and the first switch tube K4 are disconnected, and the switch tube of the upper bridge arm and the switch tube of the lower bridge arm of the bridge arm module 2012 are periodically controlled to be alternately turned on to continuously boost and pre-charge the pre-charge capacitor C1 according to the boost charging mode.

[0198] According to other embodiments of the present disclosure, the controller 202 is specifically configured to:

[0199] The first contactor K1, the second contactor K2, the second switching tube K5 and the fourth contactor K6 are closed, and the third contactor K3 and the first switching tube K4 are opened.

[0200] The upper bridge and the lower bridge of the bridge arm module 2012 are periodically controlled to be alternately turned on, so as to boost charge the power battery 300 in a boost charging mode.

[0201] For example, when the target charging mode is the boost charging mode, as shown in Figure 4, in step one, the first contactor K1, the second contactor K2 and the second switch tube K5 can be closed, the fourth contactor K6 and the switch tube of the lower bridge arm of the bridge arm module 2012 can be turned on, and the third contactor K3, the first switch tube K4 and the switch tube of the upper bridge arm of the bridge arm module 2012 can be disconnected to charge the inductive element 2011 through the power supply device 400. As shown in FIG6 , in step 2, the first contactor K1, the second contactor K2, and the second switch tube K5 can be kept closed, and the fourth contactor K6 can be turned on, while the third contactor K3 and the first switch tube K4 can be disconnected, and the switch tube of the lower bridge arm of the bridge arm module 2012 can be disconnected, and the switch tube of the upper bridge arm of the bridge arm module 2012 can be turned on, so as to utilize the freewheeling effect of the inductive element 2011 and charge the power battery 300 simultaneously through the power supply device 400 and the inductive element 2011, thereby achieving boost charging of the power battery 300.

[0202] In some embodiments, step one and step two can be repeated periodically, that is, the first contactor K1, the second contactor K2, the second switch tube K5 are kept closed and the fourth contactor K6 is turned on, and the third contactor K3 and the first switch tube K4 are disconnected, and the switch tube of the upper bridge arm and the switch tube of the lower bridge arm of the bridge arm module 2012 are periodically controlled to be alternately turned on to continuously boost charge the power battery 300 in accordance with the boost charging mode.

[0203] According to other embodiments of the present disclosure, the controller 202 is specifically configured to:

[0204] The second switch tube K5 is closed, the switch tube of the upper bridge arm of the bridge arm module 2012 is turned on, and the first contactor K1, the second contactor K2, the third contactor K3, the first switch tube K4 and the switch tube of the lower bridge arm of the bridge arm module 2012 are turned off.

[0205] The fourth contactor K6 is periodically turned on to perform a step-down pre-charging for the pre-charging capacitor C1 in a step-down charging mode.

[0206] For example, when the target charging mode is the buck charging mode, as shown in FIG7 , in step 1, the second switch K5 and the fourth contactor K6 are closed, turning on the switch of the upper arm of the bridge arm module 2012, and the first contactor K1, the second contactor K2, the third contactor K3, the first switch K4, and the switch of the lower arm of the bridge arm module 2012 are disconnected, so that the inductive element 2011 and the pre-charge capacitor C1 are charged in series via the power supply device 400. As shown in FIG4 , step 1 may also be: closing the second switch K5 and the fourth contactor K6, turning on the switch of the lower arm of the bridge arm module 2012, and disconnecting the first contactor K1, the second contactor K2, the third contactor K3, the first switch K4, and the switch of the upper arm of the bridge arm module 2012, so that the inductive element 2011 is charged via the power supply device 400. As shown in Figure 8, in step two, the second switch tube K5 can be kept closed, the switch tube of the upper bridge arm of the bridge arm module 2012 can be turned on, and the first contactor K1, the second contactor K2, the third contactor K3, the first switch tube K4 and the switch tube of the lower bridge arm of the bridge arm module 2012 are disconnected, and the fourth contactor K6 is disconnected, so as to utilize the freewheeling effect of the inductive element 2011 to charge the pre-charge capacitor C1 through the inductive element 2011, thereby realizing the voltage reduction pre-charging of the pre-charge capacitor C1.

[0207] In some embodiments, steps one and two can be repeated periodically. Taking the circuit shown in Figure 7 in step one as an example, the second switch tube K5 can be kept closed, the switch tube of the upper bridge arm of the bridge arm module 2012 can be turned on, and the first contactor K1, the second contactor K2, the third contactor K3, the first switch tube K4 and the switch tube of the lower bridge arm of the bridge arm module 2012 can be disconnected, and the fourth contactor K6 can be periodically turned on to continuously perform step-down pre-charging for the pre-charge capacitor C1 in accordance with the step-down charging mode.

[0208] According to other embodiments of the present disclosure, the controller 202 is specifically configured to:

[0209] The second contactor K2, the third contactor K3, the first switching tube K4 and the second switching tube K5 are closed, and the first contactor K1 and the fourth contactor K6 are opened.

[0210] The switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 are periodically controlled to be alternately turned on, so as to perform step-down charging for the power battery 300 in a step-down charging mode.

[0211] For example, when the target charging mode is the buck charging mode, as shown in FIG9 , in step 1, the second contactor K2, the third contactor K3, the first switch K4, and the second switch K5 can be closed to turn on the switch of the upper arm of the bridge arm module 2012, and the first contactor K1, the fourth contactor K6, and the switch of the lower arm of the bridge arm module 2012 can be disconnected, so that the inductive element 2011 and the power battery 300 are charged in series via the power supply device 400. As shown in FIG10 , step 1 can also be: closing the first switch K4 and the second switch K5 to turn on the switch of the upper arm of the bridge arm module 2012, and disconnecting the first contactor K1, the second contactor K2, the third contactor K3, the fourth contactor K6, and the switch of the lower arm of the bridge arm module 2012, so that the inductive element 2011 is charged via the power supply device 400. As shown in FIG11 , in step 2, the second contactor K2, the third contactor K3, the first switch tube K4, and the second switch tube K5 can be kept closed, and the first contactor K1 and the fourth contactor K6 can be opened. The switch tube of the upper arm of the bridge arm module 2012 is disconnected, and the switch tube of the lower arm of the bridge arm module 2012 is turned on, so as to utilize the freewheeling effect of the inductive element 2011 to charge the power battery 300 through the inductive element 2011, thereby realizing voltage reduction charging of the power battery 300.

[0212] In some embodiments, step one and step two can be repeated periodically. Taking the circuit shown in Figure 9 in step one as an example, the second contactor K2, the third contactor K3, the first switch tube K4 and the second switch tube K5 can be kept closed, and the first contactor K1 and the fourth contactor K6 can be kept disconnected, and the switch tube of the upper bridge arm and the switch tube of the lower bridge arm of the bridge arm module 2012 can be periodically controlled to be alternately turned on to continuously perform step-down charging for the power battery 300 in accordance with the step-down charging mode.

[0213] According to other embodiments of the present disclosure, the controller 202 is specifically configured to:

[0214] The second switch tube K5 is closed, and the first contactor K1 , the second contactor K2 , the third contactor K3 , the fourth contactor K6 , and the switches of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 are opened.

[0215] The first switch tube K4 is periodically turned on to directly pre-charge the pre-charge capacitor C1 in a direct charging mode.

[0216] For example, when the target charging mode is the direct charging mode, as shown in FIG12 , in step 1, the second switch tube K5 may be closed, and the first contactor K1, the second contactor K2, the third contactor K3, the first switch tube K4, the fourth contactor K6, and the switches of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 may be disconnected. In step 2, the second switch tube K5 may be kept closed, and the first contactor K1, the second contactor K2, the third contactor K3, the fourth contactor K6, and the switches of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 may be disconnected, and the first switch tube K4 may be turned on.

[0217] In some embodiments, step one and step two can be repeated periodically, that is, the second switch tube K5 is kept closed, and the first contactor K1, the second contactor K2, the third contactor K3, the fourth contactor K6 and the switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 are disconnected, and the first switch tube K4 is periodically turned on, wherein the preset voltage interval can be a smaller voltage interval, and the output voltage floating within the preset voltage interval can be considered to be stable, so that the pre-charge capacitor C1 is directly pre-charged in accordance with the direct charging mode to avoid the power supply device 400 outputting too much current and damaging the pre-charge capacitor C1.

[0218] According to other embodiments of the present disclosure, the controller 202 is specifically configured to:

[0219] The first contactor K1 , the second contactor K2 and the second switch tube K5 are closed, and the third contactor K3 , the fourth contactor K6 and the switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 are opened.

[0220] The first switch tube K4 is periodically turned on, and after the output voltage of the power supply device is maintained in a preset voltage range, the first switch tube K4 is kept turned on to directly charge the power battery 300 in a direct charging mode.

[0221] For example, when the target charging mode is the direct charging mode, as shown in FIG13 , in step 1, the first contactor K1, the second contactor K2, and the second switch tube K5 may be closed, and the third contactor K3, the first switch tube K4, the fourth contactor K6, and the switches of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 may be opened. In step 2, the first contactor K1, the second contactor K2, and the second switch tube K5 may remain closed, and the third contactor K3, the fourth contactor K6, and the switches of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 may be opened, and the first switch tube K4 may be turned on.

[0222] In some embodiments, step one and step two can be repeated periodically, that is, the first contactor K1, the second contactor K2, and the second switch tube K5 are kept closed, and the third contactor K3, the fourth contactor K6, and the switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module 2012 are kept disconnected, and the first switch tube K4 is periodically turned on until the output voltage of the power supply device 400 stabilizes in the preset voltage range, and the first switch tube K4 is controlled to be continuously turned on, so as to directly charge the power battery 300 in the direct charging mode, and avoid the power supply device 400 outputting excessive current and damaging the power battery 300.

[0223] Referring to Figure 14 , a schematic diagram of the circuit structure of a charging system according to an embodiment of the present invention is shown. One end of the switching tube is adapted to be electrically connected to the charging port, and the other end is electrically connected to the first end of the inductive element. It should be noted that the charging port is a DC charging port connected to a DC charging pile. Since electric vehicles currently support DC charging, DC charging is generally achieved using a charging pile. The electrical energy received by the charging port in the embodiments of the present invention is DC electrical energy.

[0224] The inductive element and bridge module can be existing structures in electric vehicles. For example, the inductive element can be the motor winding, and the bridge module can be the motor's control circuit. Conventional electric motors in electric vehicles currently include drive motors and refrigeration system motors (typically air conditioning motors). Regardless of the type of motor, the motor control circuit structure is essentially the same, consisting of metal-oxide-semiconductor field-effect transistors (MOS) or insulated gate bipolar transistors (IGBTs). Therefore, any motor and its control circuit can be reused.

[0225] During the actual charging process, if boost charging is required (i.e., the voltage of the electric energy received by the charging port is lower than the voltage of the power battery), that is, the charging system operates in boost charging mode, the switch tube is controlled to be disconnected, and the inductive element and the bridge arm module are used to form a boost charging circuit to increase the voltage of the electric energy received by the charging port to charge the power battery.

[0226] If step-down charging is required (i.e., the voltage of the electric energy received by the charging port is higher than the voltage of the power battery), that is, the charging system operates in step-down charging mode, the working state of the switch tube is controlled first, and a step-down charging circuit is formed using the inductive element and the bridge arm module to reduce the voltage received by the charging port to charge the power battery.

[0227] It is naturally understandable that if it is direct charging (that is, when the voltage of the electric energy received by the charging port is equal to the voltage of the power battery), that is, when the charging system operates in direct charging mode, there is no need for boost or buck charging. The first switch tube is controlled to be closed and the second switch tube is disconnected. The electric energy received by the charging port is transmitted to the power battery through the inductive element and the bridge arm module to directly charge the power battery.

[0228] It should be noted that, in general, a power battery also requires a positive switch and a negative switch, referred to as the first contactor and the second contactor in the embodiments of the present invention. These switches are generally implemented by normally open contacts on the contactor, rather than by a switching transistor. When charging the power battery, the first and second contactors need to be closed. When precharging the pre-charge capacitor, the first and second contactors need to be open.

[0229] Based on the above circuit structure, a preferred switch tube structure includes: a first switch tube and a second switch tube. The first end of the first switch tube is suitable for electrically connecting to the first end of the charging port (i.e., the positive end); the second end of the first switch tube is electrically connected to the first end of the inductive element; the first end of the second switch tube is electrically connected to the first end of the inductive element; and the second end of the second switch tube is suitable for electrically connecting to the second end of the charging port (i.e., the negative end).

[0230] Based on the above switch tube structure, there is another connection relationship: the second end of the first switch tube is electrically connected to the first end of the second switch tube, and the electrical connection is electrically connected to the first end of the inductive element. Both connection modes are acceptable.

[0231] Considering that the power received by the charging port may contain ripple, which may affect charging efficiency and quality, the charging system also includes a filter capacitor; one end of the filter capacitor is electrically connected to the first end of the inductive element, and the other end is electrically connected to the negative terminal of the bridge arm module. This filter capacitor is used to filter the power received by the charging port, thereby eliminating possible ripple in the power and improving charging efficiency and quality.

[0232] Furthermore, since the power battery discharges during driving or similar operating conditions, even though the switch is disconnected during these conditions, the power battery's electrical energy is not transmitted to the charging port, causing it to become charged. Uninformed individuals who accidentally touch the charging port or its corresponding location could pose a risk of electric shock. To further enhance safety, and to prevent the possibility of the switch closing due to erroneous control signals or failing to disconnect due to damage, the charging system also includes a first contactor or a second contactor.

[0233] One end of the first contactor is electrically connected to the second end of the switch tube, and the other end is electrically connected to the first end of the inductive element; the first contactor is used to control the on / off of the circuit between the second end of the switch tube and the first end of the inductive element. The first contactor is used to distinguish between driving and charging conditions in a hardware manner. When driving or in similar working conditions, the first contactor is disconnected to prevent the charging port from being energized when the power battery is discharged. In this way, even if a person accidentally touches the charging port or the corresponding position without knowing it, there will be no risk of electric shock. When the first contactor is closed during charging, since the charging gun is already plugged into the charging port, the above-mentioned risk of electric shock does not exist.

[0234] If there is only a second contactor, one end of the second contactor is electrically connected to the negative terminal of the bridge arm module, and the other end is suitable for being electrically connected to the second end of the charging port. The second contactor is used to control the on-off circuit between the charging port and the negative terminal of the bridge arm module. In this way, since the circuit from the power battery to the negative pole of the charging port can be disconnected by the second contactor, the problem of the charging port being charged when the power battery is discharged is also avoided. Of course, a better way is to set both the first contactor and the second contactor in the circuit, so as to ensure double safety. In the event that one of the contactors is damaged, it can still be ensured that the charging port is not charged when the power battery is discharged.

[0235] In addition, if a filter capacitor is present, one end of the second contactor is electrically connected to the negative terminal of the bridge arm module and the filter capacitor respectively, and the other end is electrically connected to the negative terminal of the charging port.

[0236] For the two switching transistors, preferably, the first switching transistor includes a first field-effect transistor, and the second switching transistor includes a second field-effect transistor. The first field-effect transistor has a first end adapted to be electrically connected to the positive terminal of the charging port, a third end adapted to receive a first control signal, and a second end electrically connected to the first end of the inductive element. The second field-effect transistor has a first end electrically connected to the first end of the inductive element, a third end adapted to receive a second control signal, and a second end electrically connected to the second end of the charging port and the negative terminal of the power battery, respectively.

[0237] It is naturally understandable that if the second end of the first field effect transistor is electrically connected to the first end of the second field effect transistor, then the electrical connection point between the two is electrically connected to the first end of the inductive element.

[0238] The inductive element includes N phase windings, and the bridge arm module includes N parallel bridge arms. To better illustrate the structure and operation of the inductive element and bridge arm module, the following example uses a motor winding as the inductive element and a motor control circuit as the bridge arm module.

[0239] The windings of a general motor include: three-phase windings; the motor control circuit includes: a first bridge arm, a second bridge arm, and a third bridge arm; the first ends of each of the three-phase windings are short-circuited and connected to the electrical connection points of the two field-effect transistors; the second end of the first winding in the three-phase winding is electrically connected to the midpoint of the first bridge arm, the second end of the second winding is electrically connected to the midpoint of the second bridge arm, and the second end of the third winding is electrically connected to the midpoint of the third bridge arm.

[0240] To more clearly explain and illustrate the circuit structure of the above-mentioned charging system, refer to Figure 15, a schematic diagram of a preferred charging system circuit structure. Figure 15 illustrates a specific structure of a field-effect transistor, a three-phase winding, three bridge arms, and a pre-charge capacitor C1 and a filter capacitor C2. The system includes: a first contactor K1 for the power battery, a second contactor K2, a fourth contactor K6, a first switching transistor K4, a second switching transistor K5, a fifth contactor K7, a charging port J, a power battery 300, a three-phase winding, and three bridge arms WBA.

[0241] During direct charging, the first switch K4 is closed, the first contactor K1 and the second contactor K2 are closed, the second switch K5 is disconnected, the fourth contactor K6 and the fifth contactor K7 are closed, and the lower bridges of the first, second, and third bridge arms are closed, while the upper bridge of at least one bridge arm is turned on. The electrical energy received by the charging port J is then transmitted to the power battery via the three-phase windings and the upper bridge of the first, second, or third bridge arms, thereby directly charging the power battery. The specific current direction during charging can be shown in Figure 16. During direct charging, since the three-phase windings are always energized, they can be regarded as three-phase inductors in terms of electrical characteristics. Since the inductors are always energized, they can be regarded as wires, thus achieving direct charging. It should be noted that, during the charging process of any mode, or during the pre-charging process of the pre-charge capacitor, whether the upper bridge or the lower bridge of the bridge arm is turned on, only one bridge arm can be turned on. Of course, two bridge arms or all three bridge arms can be turned on. The difference lies in the performance, such as power, ripple, etc. For example: when all three bridge arms are turned on, their power is higher than that when two bridge arms or one bridge arm are turned on, and the efficiency is higher. Of course, when the three bridge arms are turned on at the same time, the ripple is larger than when the three bridge arms are turned on alternately. These are all known to those skilled in the art based on the structure of the motor and its control circuit, and will not be described one by one.

[0242] When the voltage of the electrical energy received by the charging port is lower than the voltage of the power battery, for example, the power battery voltage is 600V, but the charging station can only provide 500V, so boost charging is required. During boost charging, the fourth contactor K6 and the fifth contactor K7 are closed, controlling the first switch tube K4 to close and the second switch tube K5 to open. The first contactor K1 and the second contactor K2 of the power battery are also closed, controlling the upper bridge of the first bridge arm, the second bridge arm, and the third bridge arm to close, and the lower bridge of at least one bridge arm to conduct for a first preset time. The electrical energy received by the charging port is used to charge the three-phase winding. The specific current direction during charging in this case can be shown in Figure 17.

[0243] After the first preset time of conduction, the lower bridges of the first, second, and third bridge arms are controlled to be closed, and the upper bridge of at least one bridge arm is turned on (the opposite of the switching state of the bridge arms when charging the three-phase winding). Then, the electric energy received by the charging port J and the freewheeling of the three-phase winding work together to increase its voltage and charge the power battery, thus achieving boost charging. The specific current direction during charging in this case can be shown in Figure 18. These two processes are repeated, that is, the two current charging processes shown in Figures 17 and 18 are repeated until charging is completed, for example, until the power battery is fully charged.

[0244] When the voltage of the electric energy received by the charging port is higher than the voltage of the power battery, for example, the voltage of the power battery is 300V, and the charging pile can provide 800V, so step-down charging is required. During step-down charging, the fourth contactor K6 and the fifth contactor K7 are closed, directly closing the first contactor K1 and the second contactor K2. In the first stage, the first switch tube K4 is controlled to be closed for a period of time, and the second switch tube K5 is disconnected for a period of time, controlling the lower bridge of the first bridge arm, the second bridge arm, and the third bridge arm to be closed, and the upper bridge of at least one bridge arm to be turned on. Then, the electric energy received by the charging port J is used to charge the three-phase winding and the power battery at the same time. Since the three-phase winding can be regarded as an inductor in terms of electrical characteristics, and the inductor has the effect of hindering current during charging for a period of time (not when it is always charged), it can be regarded as having a higher resistance value. In this case, it actually receives electric energy together with the power battery voltage divider, so the voltage received by the power battery will become lower, that is, the power battery step-down charging is achieved. The specific current direction during charging in this case can be shown in Figure 19. Since the output voltage of the charging pile is higher than the power battery voltage, its output power is higher than when it is output at the power battery voltage, which improves the output power of the charging pile and charges low-voltage electric vehicles well, maximizing the power utilization of the charging pile, making the charging pile output as large as possible and shortening the charging time.

[0245] After the first switch K4 is closed for a period of time and the second switch K5 is opened for a period of time, the second stage controls the first switch K4 to be opened for a period of time and the second switch K5 to be closed for a period of time. The two periods of time may be the same or different, and the specific duration is determined by the actual voltage of the power battery. At the beginning of charging, the actual voltage is low. As the charging process progresses, the actual voltage will increase, and the corresponding closing or opening time will also shorten accordingly. The specific duration can be determined by the actual voltage of the power battery.

[0246] After the first switch tube K4 is closed for a period of time and the second switch tube K5 is opened for a period of time, in the second stage, the first switch tube K4 is controlled to be opened and the second switch tube K5 is closed, and then the lower bridges of the first bridge arm, the second bridge arm, and the third bridge arm are controlled to be closed and the upper bridge of at least one bridge arm is turned on (the same as the switching state of the bridge arm when the three-phase winding and the power battery are charged at the same time as before). Then, the three-phase winding continues to charge the power battery at a reduced voltage, and the electric energy received by the charging port no longer supplies power to the three-phase winding and the power battery during this period. The specific current direction during charging in this case can be shown in Figure 20. These two processes are repeated, that is, the two current charging processes shown in Figures 19 and 20 are repeated until charging is completed.

[0247] Through the above description, combined with the current direction of Figures 17, 18, 19, and 20, it can be seen that the charging system proposed by the present invention, whether it is boost charging or buck charging, its current direction is always consistent, and the opposite situation will not occur. For example: when charging an electric car at present, it may send its own real-time voltage of 200V to the charging pile, while the voltage of the power battery when fully charged is 1000V, and the maximum charging voltage that the charging pile can provide is 750V. Then at the beginning, the charging system charges the power battery in a buck charging mode, and the charging pile can maximize the output and have high output power; when the power battery is charged to 750V, the charging system does not need to release electric energy, and directly switches to a boost charging mode to continue charging the power battery smoothly and seamlessly until the power battery is fully charged to 1000V.

[0248] Therefore, no matter it is switching from boost to buck, or from buck to boost, the charging system does not require an energy release process. It does not need to release the electric energy before switching. It will not cause waste of electric energy, reduce charging costs, shorten charging time, and bring users a better charging experience.

[0249] Generally, before charging the power battery, the pre-charge capacitor C1 must be pre-charged to ensure that its voltage reaches or approaches the real-time voltage of the power battery. The current sequence of the pre-charge capacitor C1 is similar to that of boost and buck charging.

[0250] When boost pre-charging is required, that is, when the charging system operates in boost pre-charging mode, the fourth contactor K6 and the fifth contactor K7 are closed, controlling the first switch tube K4 to close and the second switch tube K5 to open, and disconnecting the first contactor K1 and the second contactor K2 of the power battery. The upper bridges of the first, second, and third bridge arms are controlled to close, and the lower bridge of at least one bridge arm is turned on for a second preset time. Then, the power energy received by the charging port J or the power energy provided by the vehicle power supply (such as the high-voltage side of the battery after DC-DC conversion) is used to charge the three-phase winding. The specific current direction during charging in this case can be shown in Figure 17. The only difference is that when boost pre-charging the pre-charge capacitor C1, the first contactor K1 and the second contactor K2 are disconnected, not closed.

[0251] After the second preset time, the lower bridges of the first, second, and third bridge arms are controlled to be closed, and the upper bridge of at least one bridge arm is turned on. The power received by the charging port J or the power provided by the vehicle power supply and the freewheeling of the three-phase windings work together to increase the voltage and charge the pre-charge capacitor C1. This process is repeated until the difference between the voltage of the pre-charge capacitor C1 and the current real-time voltage of the power battery is within a preset range. The specific current direction during charging in this case can be seen in Figure 21.

[0252] When step-down pre-charging is required, that is, when the charging system operates in step-down pre-charging mode, the fourth contactor K6 and the fifth contactor K7 are closed, and the first contactor K1 and the second contactor K2 are disconnected. In the first stage, the first switch tube K4 is controlled to be closed for a period of time, and the second switch tube K5 is first disconnected for a period of time, controlling the lower bridge of each of the first bridge arm, the second bridge arm, and the third bridge arm to be closed, and the upper bridge of at least one bridge arm to be connected. Then, the power received by the charging port J or the power provided by the in-vehicle power supply is used to charge the three-phase winding and the pre-charge capacitor C1 simultaneously, that is, the pre-charge capacitor C1 is charged at a reduced voltage. The specific current direction during charging in this case can be shown in Figure 22.

[0253] After controlling the first switch K4 to close for a period of time and the second switch K5 to open for a period of time, the second stage controls the first switch K4 to open for a period of time and the second switch K5 to close for a period of time. This is the same as the aforementioned step-down charging process. The two periods of time may be the same or different, and the specific duration is also determined by the actual voltage of the power battery. During this period, the lower bridges of the first, second, and third bridge arms are controlled to be closed, and the upper bridge of at least one bridge arm is turned on. The three-phase winding freewheels to continue step-down charging the pre-charge capacitor C1. This process is repeated until the difference between the voltage of the pre-charge capacitor C1 and the current real-time voltage of the power battery 300 is within a preset range. The specific current direction during charging in this case can be seen with reference to Figure 23.

[0254] During direct pre-charging, that is, when the charging system operates in direct pre-charging mode, the fourth contactor K6 and the fifth contactor K7 are closed, controlling the first switch tube K4 to be closed, the second switch tube K5 to be disconnected, the first contactor K1 and the second contactor K2 to be disconnected, and controlling the lower bridges of the first bridge arm, the second bridge arm, and the third bridge arm to be closed, and the upper bridge of at least one bridge arm to be turned on. Then, the electric energy received by the charging port J or the electric energy provided by the power supply in the vehicle is input to the pre-charge capacitor C1 through the three-phase winding and the upper bridge of at least one bridge arm, and the pre-charge capacitor C1 is directly charged until the voltage of the pre-charge capacitor is within a preset range compared with the current real-time voltage of the power battery 300.

[0255] The above method pre-charges the pre-charge capacitor C1. Furthermore, if the charging port J does not receive power or fails to transmit power due to a fault, the pre-charge capacitor C1 can be pre-charged with power from the vehicle's power supply. This allows the pre-charge capacitor C1 to be pre-charged before the power battery 300 is discharged, preventing discharge failure of the power battery 300.

[0256] Through the above embodiments, the charging system of the present invention only adds a switch tube, and no longer needs a DC fast charging boost or buck module, thus realizing the boost-boost charging function. That is, when boost charging is required, the inductive element and the bridge arm module are used to form a boost charging circuit, and the voltage received by the charging port is increased to charge the power battery, solving the problem of low-voltage charging piles boosting the voltage to charge electric vehicles; at the same time, when step-down charging is required, the inductive element and the bridge arm module are used to form a step-down charging circuit, and the voltage received by the charging port is reduced to charge the power battery, solving the problem that the high-voltage charging pile has low output power and cannot charge low-voltage electric vehicles well, and cannot maximize the use of the charging pile power, so that the charging pile can output as much power as possible and reduce the charging time. Through the above-mentioned step-up and step-down methods, the compatibility and convenience of electric vehicle charging are improved.

[0257] Furthermore, during the charging process, all circuits involve inductive components and switching transistors, effectively preventing the risk of short circuits between the vehicle and the charging station. In addition to the inductor, the pre-charging circuit of the power battery can also be combined to further prevent the risk of short circuits between the vehicle and the charging station.

[0258] The first or second contactor is closed during both step-up and step-down charging, distinguishing between driving and charging conditions. Disconnecting the first or second contactor during driving or similar conditions prevents the charging port from being charged while the power battery is discharging, thus preventing people from accidentally touching the charging port or the corresponding position without knowing it and avoiding the risk of electric shock.

[0259] The entire charging system reuses the original structure with very few additional components. Therefore, the overall structure uses fewer components and the circuit lines are simple, which reduces space occupancy and also reduces the cost of electric vehicles. In addition, the simpler control logic also indirectly reduces the difficulty of EMC design of the entire vehicle.

[0260] Please refer to Figure 24, which is a schematic diagram of the structure of a charging system 200 provided in an embodiment of the present application. As shown in Figure 24, the charging system 200 includes a switch component 2013, a bridge arm module 2012, an inductive element 2011, and a controller 202. The charging system 200 is used to charge the power battery 300;

[0261] The first end of the bridge arm module 2012 is adapted to be connected to the positive electrode of the power battery 300, and the second end of the bridge arm module 2012 is adapted to be connected to the negative electrode of the power battery 300. The first end of the inductive element 2011 is adapted to be connected to a DC power supply via the switch assembly 2013, and the midpoint of the bridge arm of the bridge arm module 2012 is connected to the second end of the inductive element 2011. The second end of the bridge arm module 2012 is adapted to be connected to a DC power supply.

[0262] When the charging system 200 operates in the boost mode, the controller 202 controls the switching state of the switch component 2013 so that the bridge arm module 2012 and the inductive element 2011 form a boost circuit.

[0263] When the charging system 200 operates in the buck mode, the controller 202 controls the switching state of the switch component 2013 so that the bridge arm module 2012 and the inductive element 2011 form a buck circuit.

[0264] The power battery 300 in the embodiment of the present application can be a power battery in an electric device. The charging system 200 in the embodiment of the present application is a device for charging the power battery 300. The electric device can be a device that uses electrical energy. For example, the electric device can include any of vehicles, aircraft, ships, and energy storage cabinets.

[0265] The switch assembly 2013 may include at least one contactor.

[0266] The bridge arm module 2012 may include at least one bridge arm midpoint. The bridge arm module 2012 may include at least one bridge arm unit, each bridge arm unit having a bridge arm midpoint. Each bridge arm unit may include two switching transistors, and the connection point of the two switching transistors is the bridge arm midpoint of the bridge arm unit.

[0267] The inductive element 2011 may include at least one inductor. One end of the inductor is connected to a DC power supply via a switch assembly 2013, and the other end of the inductor is connected to a midpoint of a bridge arm of the bridge arm module 2012. Each of the at least one inductor is connected to a different midpoint of the bridge arm.

[0268] The number of bridge arm units in the bridge arm module 2012 can be designed as needed.

[0269] In a possible embodiment, the bridge arm module 2012 can reuse the bridge arm module in the motor controller, and the inductive element 2011 can reuse the inductor in the motor.

[0270] Optionally, as shown in Figure 24, the switch assembly 2013 includes a first contactor K1 and a second contactor K2, the positive pole of the power battery 300 is suitable for connecting to the first end of the first contactor K1, the second end of the first contactor K1 is connected to the first end of the bridge arm module 2012, the negative pole of the power battery 300 is suitable for connecting to the first end of the second contactor K2, and the second end of the second contactor K2 is connected to the second end of the bridge arm module 2012.

[0271] In the embodiment of the present application, the bridge arm module 2012 is connected to the power battery 300 through the first contactor K1 and the second contactor K2.

[0272] Optionally, as shown in Figure 24, the switch assembly 2013 also includes: a third contactor K3, a sixth contactor K8, and a seventh contactor K9, the first end of the first contactor K1 is connected to the first end of the third contactor K3, the second end of the first contactor K1 is connected to the first end of the seventh contactor K9, the second end of the seventh contactor K9 is suitable for connecting the positive pole of the DC power supply and the first end of the sixth contactor K8, the second end of the third contactor K3 is connected to the second end of the sixth contactor K8, the second end of the sixth contactor K8 is suitable for connecting to the first end of the inductive element 2011, and the negative pole of the DC power supply is suitable for connecting to the second end of the bridge arm module 2012.

[0273] Optionally, the charging system 200 further includes a pre-charge capacitor C1 , the second end of the first contactor K1 is connected to the first end of the pre-charge capacitor C1 , and the second end of the second contactor K2 is connected to the second end of the pre-charge capacitor C1 .

[0274] The pre-charge capacitor C1 can be a pre-charge capacitor. Before the DC power supply charges the power battery 300, it can pre-charge the pre-charge capacitor C1 to prevent the high current generated by the power battery 300 during charging due to the pre-charge capacitor C1 not being fully charged. The pre-charge capacitor C1 can be used to stabilize the voltage across the power battery 300. This can reduce the ripple generated during the step-up or step-down process when the DC power supply charges the power battery 300.

[0275] Optionally, the bridge arm module 2012 includes N bridge arm units in parallel, each bridge arm unit includes an upper bridge switch tube and a lower bridge switch tube connected in series; the inductive element 2011 includes N inductors; the first ends of the N inductors are connected to the second end of the sixth contactor K8, and the second ends of the N inductors are connected one-to-one to the bridge arm midpoints of the N bridge arm units, and the bridge arm midpoint of each bridge arm unit is the connection point of the upper bridge switch tube and the lower bridge switch tube of each bridge arm unit, and N is an integer greater than or equal to 1.

[0276] The first end of the upper bridge switch is connected to the second end of the first contactor K1, the second end of the upper bridge switch is connected to the first end of the corresponding lower bridge switch, and the second end of the lower bridge switch is connected to the second end of the second contactor K2. The connection point between the second end of the upper bridge switch and the first end of the corresponding lower bridge switch is the midpoint of the bridge arm.

[0277] The upper bridge switch tube and the lower bridge switch tube can be any one of an insulated-gate bipolar transistor (IGBT) and a metal-oxide-semiconductor field-effect transistor (MOSFET).

[0278] In FIG. 24 , N=3 is taken as an example for explanation.

[0279] The controller 202 can be used to control the closing or opening of the first contactor K1, the second contactor K2, the third contactor K3, the sixth contactor K8, and the seventh contactor K9, and to control the state of the switch tube in the bridge arm module 2012, thereby controlling the charging system 200 to operate in the boost mode, the buck mode, or the direct charging mode.

[0280] A DC power supply is a device that provides direct current. For example, the DC power supply can be a DC charging station.

[0281] Optionally, the DC power supply includes: a DC charging pile or DC / DC, etc.

[0282] In the embodiments of the present application, a direct current / direct current converter (DC / DC) can convert direct current (DC) of one voltage into direct current (DC) of another voltage. For example, when a DC / DC converts high-voltage DC to low-voltage DC, the DC / DC can be the input terminal of the DC / DC. For example, the input terminal of the DC / DC can be connected to the power battery 300.

[0283] Optionally, based on the charging system 200 of FIG. 24 , the controller 202 controls the switching state of the switch component 2013 so that the bridge arm module 2012 and the inductive element 2011 form a boost circuit, including:

[0284] In the first stage, the controller 202 controls the sixth contactor K8 to be closed, the third contactor K3 and the seventh contactor K9 to be opened, at least one lower bridge switch of the bridge arm module 2012 to be turned on, and the N upper bridge switches of the bridge arm module 2012 to be turned off, so that the DC power supply charges the inductive element 2011;

[0285] In the second phase, the controller 202 controls the first contactor K1, the second contactor K2, and the sixth contactor K8 to be closed, the third contactor K3 and the seventh contactor K9 to be opened, at least one upper bridge switch of the bridge arm module 2012 to be turned on, and the N lower bridge switches of the bridge arm module 2012 to be turned off, so that the DC power supply and the inductive element 2011 charge the power battery 300. The charging voltage of the power battery 300 is equal to the sum of the voltage of the DC power supply and the voltage of the inductive element 2011.

[0286] In the embodiment of the present application, during the first and second stages, the first contactor K1 and the second contactor K2 may be closed or opened, which is not limited in the embodiment of the present application. When the charging system 200 operates in boost mode, in the first stage, the controller 202 may control the sixth contactor K8 to close, the third contactor K3 and the seventh contactor K9 to open, the at least one lower bridge switch of the bridge arm module 2012 to turn on, and the N upper bridge switches of the bridge arm module 2012 to turn off. At this time, the DC power supply charges the inductor connected in series with the at least one lower bridge switch, thereby increasing the voltage across the inductor. In the second phase, the controller 202 can control the first contactor K1, the second contactor K2, and the sixth contactor K8 to close, the third contactor K3, and the seventh contactor K9 to open, the at least one upper bridge switch of the bridge arm module 2012 to turn on, and the N lower bridge switches of the bridge arm module 2012 to turn off. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch (the inductor connected in series with the at least one upper bridge switch, i.e., the inductor connected in series with the at least one lower bridge switch), the DC power supply and the inductor connected in series with the at least one upper bridge switch jointly charge the power battery 300. Because the voltage across the power battery 300 is equal to the sum of the voltage of the DC power supply and the voltage of the inductor connected in series with the at least one upper bridge switch, the DC power supply is boosted to charge the power battery 300. In this embodiment of the present application, in the boost mode, the DC power supply does not charge the power battery 300 directly. Instead, the DC power supply charges the power battery 300 through the inductor, preventing a sudden large charging current. Even if the first contactor K1, the second contactor K2, the sixth contactor K8 or any of the positive and negative contactors of the charging pile is sintered, there will be no short circuit risk, thereby improving the safety of boost charging.

[0287] The first and second phases alternate, thereby boosting the DC power supply voltage and charging the power battery 300. Each contactor can be periodically closed and closed, and each cycle can include the first and second phases. The durations of the first and second phases can be different and can be designed based on the inductor parameters, the output voltage of the DC power supply, and the voltage of the power battery 300.

[0288] It should be noted that during the first phase, when charging the inductor connected in series with the at least one lower bridge switch, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage boosting effect cannot be achieved.

[0289] Optionally, based on the charging system 200 of FIG. 24 , the controller 202 controls the switching state of the switch component 2013 so that the bridge arm module 2012 and the inductive element 2011 form a step-down circuit, including:

[0290] In the first stage, the controller 202 controls the second contactor K2, the third contactor K3, and the seventh contactor K9 to be closed, the first contactor K1 and the sixth contactor K8 to be opened, at least one upper bridge switch tube of the bridge arm module 2012 to be turned on, and the N lower bridge switch tubes of the bridge arm module 2012 to be turned off, so that the DC power supply charges the inductive element 2011 and the power battery 300;

[0291] In the second stage, the controller 202 controls the second contactor K2 and the third contactor K3 to be closed, the first contactor K1 and the sixth contactor K8 to be disconnected, at least one lower bridge switch tube of the bridge arm module 2012 to be turned on, and the N upper bridge switch tubes of the bridge arm module 2012 to be disconnected, so that the inductive element 2011 charges the power battery 300.

[0292] In the embodiment of the present application, when the charging system 200 operates in the step-down mode, in the first stage, the controller 202 can control the second contactor K2, the third contactor K3 and the seventh contactor K9 to be closed, the first contactor K1 and the sixth contactor K8 to be disconnected, at least one upper bridge switch tube of the bridge arm module 2012 to be turned on, and the N lower bridge switches of the bridge arm module 2012 to be disconnected. At this time, the DC power supply charges the inductor and the power battery 300 connected in series with the at least one upper bridge switch tube. At this time, the output voltage of the DC power supply is divided across the inductor and the power battery 300 connected in series with the at least one upper bridge switch tube, and the voltage on the power battery 300 is less than the output voltage of the DC power supply, thereby achieving step-down charging. In the second phase, the controller 202 can control the second contactor K2, the third contactor K3, and the seventh contactor K9 to be closed, the first contactor K1 and the sixth contactor K8 to be open, the at least one lower bridge switch of the bridge arm module 2012 to be turned on, and the N upper bridge switches of the bridge arm module 2012 to be turned off. At this time, due to the freewheeling effect of the inductor connected in series with the at least one lower bridge switch (the inductor connected in series with the at least one lower bridge switch, i.e., the inductor connected in series with the at least one upper bridge switch), the inductor connected in series with the at least one lower bridge switch charges the power battery 300, thereby achieving charging of the power battery 300 after the DC power supply is stepped down. In the embodiment of the present application, in the step-down mode, the DC power supply does not directly charge the power battery 300. Instead, the DC power supply charges the power battery 300 through the inductor, and a sudden large charging current does not occur. Even if the second contactor K2, the third contactor K3, the seventh contactor K9, or any of the positive and negative contactors of the charging pile ignites, there is no risk of short circuit, thereby improving the safety of step-down charging. In step-down mode, the DC power supply can output a voltage greater than that of the power battery 300, maximizing the power output of the DC power supply, thereby increasing the charging current of the power battery 300 and reducing the charging time of the power battery 300.

[0293] The first and second phases alternate, thereby achieving charging of the power battery 300 after the DC power supply is stepped down. Each contactor can be periodically closed and turned on, and each cycle can include the first and second phases. The duration of the first and second phases can be different, and can be designed based on the parameters of the inductor, the output voltage of the DC power supply, and the voltage of the power battery 300.

[0294] It should be noted that during the first phase, when charging the inductor connected in series with the at least one upper bridge switch, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage reduction effect cannot be achieved.

[0295] Optionally, when the charging system 200 operates in the direct charging mode, the controller 202 controls the switching state of the switch component 2013 so that the DC power supply charges the power battery 300 .

[0296] In the embodiment of the present application, when the voltage of the DC power supply is close to the voltage of the power battery 300, the charging system 200 can be operated in the direct charging mode. For example, when the output voltage of the DC power supply is greater than the voltage of the power battery 300, and the difference between the output voltage of the DC power supply and the voltage of the power battery 300 is less than a set threshold (for example, 20V), the charging system 200 can be operated in the direct charging mode.

[0297] Before charging the power battery 300, the charging system 200 can be operated in pre-charging mode to charge the pre-charging capacitor C1 first, thereby avoiding a large current generated during the charging process of the power battery 300 due to the pre-charging capacitor C1 not being fully charged.

[0298] Optionally, based on the charging system 200 of Figure 24, the controller 202 controls the switching state of the switch component 2013 so that the DC power supply charges the power battery 300, including: the controller 202 controls the first contactor K1, the second contactor K2, and the seventh contactor K9 to be closed, and the third contactor K3 and the sixth contactor K8 to be disconnected, so that the DC power supply charges the power battery 300.

[0299] In the embodiment of the present application, when the controller 202 controls the first contactor K1, the second contactor K2, and the seventh contactor K9 to be closed and the third contactor K3 and the sixth contactor K8 to be disconnected, the charging system 200 operates in a direct charging mode. At this time, the DC power supply can directly charge the power battery 300 without passing through the bridge arm module 2012 and the inductive element 2011, thereby improving the energy conversion efficiency.

[0300] Optionally, when the charging system 200 operates in the pre-charging mode, the controller 202 controls the switching state of the switch component 2013 so that the bridge arm module 2012 and the inductive element 2011 form a pre-charging circuit.

[0301] In the embodiment of the present application, before charging the power battery 300, the charging system 200 can be operated in a pre-charging mode to first charge the pre-charging capacitor C1 (pre-charging capacitor), thereby avoiding a large current generated during the charging process of the power battery 300 due to the pre-charging capacitor C1 not being fully charged.

[0302] Optionally, based on the charging system 200 of FIG. 24 , the controller 202 controls the switching state of the switch component 2013 so that the bridge arm module 2012 and the inductive element 2011 form a pre-charging circuit, including:

[0303] In the first stage, the controller 202 controls the sixth contactor K8 to be closed, the first contactor K1, the second contactor K2, the third contactor K3, and the seventh contactor K9 to be disconnected, at least one lower bridge switch tube of the bridge arm module 2012 to be turned on, and the N upper bridge switch tubes of the bridge arm module 2012 to be turned off, so that the DC power supply charges the inductive element 2011;

[0304] In the second phase, the controller 202 controls the sixth contactor K8 to close, the first contactor K1, the second contactor K2, the third contactor K3, and the seventh contactor K9 to open, at least one upper bridge switch of the bridge arm module 2012 to turn on, and the N lower bridge switches of the bridge arm module 2012 to turn off, so that the DC power supply and the inductive element 2011 charge the pre-charge capacitor C1. The charging voltage of the pre-charge capacitor C1 is equal to the sum of the voltage of the DC power supply and the voltage of the inductive element 2011.

[0305] In an embodiment of the present application, when the charging system 200 operates in the pre-charging mode, in the first stage, the controller 202 can control the sixth contactor K8 to close, the first contactor K1, the second contactor K2, the third contactor K3 and the seventh contactor K9 to be disconnected, at least one lower bridge switch tube of the bridge arm module 2012 to be turned on, and the N upper bridge switch tubes of the bridge arm module 2012 to be disconnected. At this time, the DC power supply charges the inductor connected in series with the at least one lower bridge switch tube to increase the voltage across the inductor. In the second stage, the controller 202 can control the sixth contactor K8 to close, the first contactor K1, the second contactor K2, the third contactor K3 and the seventh contactor K9 to be disconnected, at least one upper bridge switch tube of the bridge arm module 2012 to be turned on, and the N lower bridge switches of the bridge arm module 2012 to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch tube (the inductor connected in series with the at least one upper bridge switch tube, that is, the inductor connected in series with the at least one lower bridge switch tube), the DC power supply and the inductor connected in series with the at least one upper bridge switch tube jointly charge the pre-charge capacitor C1, thereby realizing the pre-charging of the pre-charge capacitor C1 by the DC power supply.

[0306] The durations of the first stage and the second stage may be different, and the durations of the first stage and the second stage may be designed according to the parameters of the inductor, the output voltage of the DC power supply, and the parameters of the pre-charge capacitor C1.

[0307] It should be noted that, when the inductor connected in series to the at least one lower bridge switch is charged in the first stage, the inductor cannot be in a saturated state.

[0308] In the embodiment of the present application, when pre-charging the pre-charge capacitor C1, the DC power supply and the inductor connected in series with the at least one upper bridge switch tube jointly charge the pre-charge capacitor C1. Due to the freewheeling effect of the inductor, a sudden large charging current will not occur. This can avoid the generation of large currents during the pre-charging process and improve the safety of pre-charging.

[0309] In the embodiment of the present application, when the voltage of the DC power supply is lower than the voltage of the power battery 300, the controller 202 controls the bridge arm module 2012 and the inductive element 2011 to form a boost circuit, so that the charging system 200 operates in a boost mode, thereby enabling the DC power supply to boost the voltage and charge the power battery 300. When the voltage of the DC power supply is higher than the voltage of the power battery 300, the controller 202 controls the bridge arm module 2012 and the inductive element 2011 to form a buck circuit, so that the charging system 200 operates in a buck mode, thereby enabling the DC power supply to buck the voltage and charge the power battery 300. This allows DC power supplies of different voltages to charge the power battery 300.

[0310] Please refer to Figure 25, which is a schematic diagram of the structure of another charging system 200 provided in an embodiment of the present application. Figure 25 is obtained based on Figure 24. As shown in Figure 25, based on Figure 24, the switch assembly 2013 further includes: a fourth contactor K6 and a fifth contactor K7.

[0311] The negative electrode of the DC power supply is adapted to be connected to the second end of the second contactor K2 via the fourth contactor K6. Specifically, the negative electrode of the DC power supply is connected to the first end of the fourth contactor K6, and the second end of the fourth contactor K6 is connected to the second end of the second contactor K2;

[0312] The second end of the sixth contactor K8 is connected to the first end of the inductive element 2011. Specifically, the second end of the sixth contactor K8 is connected to the first end of the fifth contactor K7, and the second end of the fifth contactor K7 is connected to the first end of the inductive element 2011.

[0313] Adding the fifth contactor K7 can reduce the risk of electric shock. If the power battery 300 is operating while the vehicle is driving or parked, the first end of the fifth contactor K7 (charging port) may be charged. Accidentally touching this point may cause an electric shock, resulting in a risk of electric shock.

[0314] Optionally, the charging system 200 further includes a filter capacitor C2, a first end of the filter capacitor C2 is connected to the second end of the sixth contactor K8, and a second end of the filter capacitor C2 is connected to the second end of the fourth contactor K6.

[0315] In the embodiment of the present application, the filter capacitor C2 can further reduce the ripple generated during the voltage step-up or step-down process when the DC power supply charges the power battery 300.

[0316] In the following embodiments, a DC power supply is described by taking a DC charging pile as an example.

[0317] Optionally, based on the charging system 200 of FIG. 25 , the control module controls the bridge arm module and the inductive element 2011 to form a boost circuit, including:

[0318] In the first stage, the control module controls the sixth contactor K8, the fourth contactor K6, and the fifth contactor K7 to be closed, the third contactor K3 and the fifth contactor K9 to be opened, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be turned off, so that the DC charging pile charges the inductive element 2011;

[0319] In the second stage, the control module controls the first contactor K1, the second contactor K2, the sixth contactor K8, the fourth contactor K6 and the fifth contactor K7 to be closed, the third contactor K3 and the fifth contactor K9 to be disconnected, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be disconnected, so that the DC charging pile and the inductive element 2011 charge the power battery 300, and the charging voltage of the power battery 300 is equal to the sum of the voltage of the DC charging pile and the voltage of the inductive element 2011.

[0320] In the embodiment of the present application, in the first and second stages, the first contactor K1 and the second contactor K2 can be closed or opened, which is not limited in the embodiment of the present application. When the charging system 200 operates in boost mode, in the first stage, please refer to Figure 26, which is a schematic diagram of the current flow in the first stage of the charging system 200 operating in boost mode according to the embodiment of the present application. As shown in Figure 26, the control module can control the sixth contactor K8, the fourth contactor K6, and the fifth contactor K7 to be closed, the third contactor K3 and the fifth contactor K9 to be opened, the at least one lower bridge switch of the bridge arm module to be turned on, and the N upper bridge switches of the bridge arm module to be turned off. At this time, the DC charging pile charges the inductor connected in series with the at least one lower bridge switch, thereby increasing the voltage across the inductor. In the second stage, please refer to Figure 27, which is a schematic diagram of the current flow in the second stage of the charging system 200 operating in boost mode according to the embodiment of the present application. As shown in FIG27 , the control module can control the first contactor K1, the second contactor K2, the sixth contactor K8, the fourth contactor K6, and the fifth contactor K7 to be closed, the third contactor K3 and the fifth contactor K9 to be open, the at least one upper bridge switch of the bridge arm module to be turned on, and the N lower bridge switches of the bridge arm module to be turned off. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch (the inductor connected in series with the at least one upper bridge switch, i.e., the inductor connected in series with the at least one lower bridge switch), the DC charging pile and the inductor connected in series with the at least one upper bridge switch jointly charge the power battery 300. Because the voltage across the power battery 300 is equal to the sum of the voltage of the DC charging pile and the voltage of the inductor connected in series with the at least one upper bridge switch, the DC charging pile charges the power battery 300 after boosting. In this embodiment of the present application, in boost mode, the DC charging pile does not directly charge the power battery 300. Instead, it charges the power battery 300 through the inductor, and a sudden large charging current does not occur. Even if the second contactor K2, the third contactor K3, the fifth contactor K9 or any of the positive and negative contactors of the charging pile is sintered, there will be no short circuit risk, thereby improving the safety of boost charging.

[0321] The first and second phases alternate, thereby boosting the voltage of the DC charging pile and charging the power battery 300. Each contactor can be periodically closed and closed, and each cycle can include the first and second phases. The duration of the first and second phases can be different, and can be designed based on the parameters of the inductor, the output voltage of the DC charging pile, and the voltage of the power battery 300.

[0322] It should be noted that during the first phase, when charging the inductor connected in series with the at least one lower bridge switch, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage boosting effect cannot be achieved.

[0323] Optionally, based on the charging system 200 of FIG. 25 , the control module controls the bridge arm module and the inductive element 2011 to form a step-down circuit, including:

[0324] In the first stage, the control module controls the second contactor K2, the third contactor K3, the fifth contactor K9, the fourth contactor K6, and the fifth contactor K7 to be closed, the first contactor K1 and the sixth contactor K8 to be opened, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be turned off, so that the DC charging pile charges the inductive element 2011 and the power battery 300;

[0325] In the second stage, the control module controls the second contactor K2, the third contactor K3, the fifth contactor K9, the fourth contactor K6 and the fifth contactor K7 to be closed, the first contactor K1 and the sixth contactor K8 to be disconnected, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be disconnected, so that the inductive element 2011 charges the power battery 300.

[0326] In the embodiment of the present application, when the charging system 200 operates in the buck mode, in the first stage, refer to FIG. 28 , which is a schematic diagram of current flow in the first stage of the charging system 200 operating in the buck mode, provided in the embodiment of the present application. As shown in FIG. 28 , the control module can control the second contactor K2, the third contactor K3, the fifth contactor K9, the fourth contactor K6, and the fifth contactor K7 to be closed, the first contactor K1 and the sixth contactor K8 to be open, the at least one upper bridge switch of the bridge arm module to be turned on, and the N lower bridge switches of the bridge arm module to be turned off. At this time, the DC charging pile charges the inductor and the power battery 300 connected in series with the at least one upper bridge switch. At this time, the output voltage of the DC charging pile is divided across the inductor and the power battery 300 connected in series with the at least one upper bridge switch, and the voltage on the power battery 300 is less than the output voltage of the DC charging pile, thereby achieving buck charging. In the second phase, please refer to FIG. 29 , which is a schematic diagram of the current flow in the second phase of a charging system 200 provided in an embodiment of the present application when operating in step-down mode. As shown in FIG. 29 , the control module can control the second contactor K2, the third contactor K3, and the fifth contactor K7 to be closed, the first contactor K1 and the sixth contactor K8 to be disconnected, the at least one lower bridge switch of the bridge arm module to be turned on, and the N upper bridge switches of the bridge arm module to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one lower bridge switch (the inductor connected in series with the at least one lower bridge switch, i.e., the inductor connected in series with the at least one upper bridge switch), the inductor connected in series with the at least one lower bridge switch charges the power battery 300, thereby achieving charging of the power battery 300 after the DC charging pile is stepped down. In the second phase, the fifth contactor K9 and the current contactor can be opened or closed, and this embodiment of the present application does not limit this. In the embodiment of the present application, in step-down mode, the DC charging pile does not charge the power battery 300 directly. Instead, it charges the power battery 300 through an inductor, and a large charging current will not suddenly appear. Even if the second contactor K2, the third contactor K3, the fifth contactor K9, or any of the positive and negative contactors of the charging pile are sintered, there will be no risk of short circuit, thereby improving the safety of step-down charging. In step-down mode, the DC charging pile can output at a voltage greater than that of the power battery 300, allowing the DC charging pile to output as much power as possible, thereby increasing the charging current of the power battery 300 and reducing the charging time of the power battery 300.

[0327] The first and second phases alternate, allowing the DC charging pile to step down and charge the power battery 300. Each contactor can be periodically closed and closed, and each cycle can include the first and second phases. The duration of the first and second phases can be different and can be designed based on the inductor parameters, the output voltage of the DC charging pile, and the voltage of the power battery 300.

[0328] It should be noted that during the first phase, when charging the inductor connected in series with the at least one upper bridge switch, the inductor cannot be in a saturated state. If the inductor is in a saturated state, the voltage across the inductor will not rise, and the voltage reduction effect cannot be achieved.

[0329] Optionally, based on the charging system 200 of Figure 25, when the charging system 200 operates in a direct charging mode, the control module controls the switching state of the switch component 2013 so that the DC power supply charges the battery, including: the control module controls the first contactor K1, the second contactor K2, the fifth contactor K9 and the fourth contactor K6 to be closed, and the third contactor K3, the sixth contactor K8 and the fifth contactor K7 to be disconnected, so that the DC charging pile charges the power battery 300.

[0330] In the embodiment of the present application, please refer to Figure 30, which is a schematic diagram of the current flow of a charging system 200 provided in the embodiment of the present application when it operates in a direct charging mode. As shown in Figure 30, when the control module controls the first contactor K1, the second contactor K2, the fifth contactor K9 and the fourth contactor K6 to be closed, and the third contactor K3, the sixth contactor K8 and the fifth contactor K7 to be disconnected, the charging system 200 operates in a direct charging mode. At this time, the DC charging pile can directly charge the power battery 300 without passing through the bridge arm module and the inductive element 2011, which can improve the energy conversion efficiency. When the voltage of the DC charging pile is close to the voltage of the power battery 300, the charging system 200 can be operated in a direct charging mode. For example, when the output voltage of the DC charging pile is greater than the voltage of the power battery 300, and the difference between the output voltage of the DC charging pile and the voltage of the power battery 300 is less than a set threshold (for example, 20V), the charging system 200 can be operated in a direct charging mode.

[0331] Optionally, based on the charging system 200 of FIG. 25 , when the charging system 200 operates in the pre-charging mode, the control module controls the switching state of the switch component 2013 so that the bridge arm module and the inductive element 2011 form a pre-charging circuit, including:

[0332] In the first stage, the control module controls the sixth contactor K8, the fourth contactor K6, and the fifth contactor K7 to be closed, the first contactor K1, the second contactor K2, the third contactor K3, and the fifth contactor K9 to be disconnected, at least one lower bridge switch tube of the bridge arm module to be turned on, and the N upper bridge switch tubes of the bridge arm module to be turned off, so that the DC charging pile charges the inductive element 2011;

[0333] In the second stage, the control module controls the sixth contactor K8, the fourth contactor K6 and the fifth contactor K7 to be closed, the first contactor K1, the second contactor K2, the third contactor K3 and the fifth contactor K9 to be disconnected, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switch tubes of the bridge arm module to be disconnected, so that the DC charging pile and the inductive element 2011 charge the pre-charge capacitor C1.

[0334] In an embodiment of the present application, when the charging system 200 operates in pre-charge mode, in the first stage, refer to FIG. 31 , which is a schematic diagram of current flow during the first stage of the charging system 200 operating in pre-charge mode, provided by an embodiment of the present application. As shown in FIG. 31 , the control module can control the sixth contactor K8, the fourth contactor K6, and the fifth contactor K7 to be closed, the first contactor K1, the second contactor K2, the third contactor K3, and the fifth contactor K9 to be disconnected, at least one lower bridge switch of the bridge arm module to be turned on, and all N upper bridge switches of the bridge arm module to be turned off. At this time, the DC charging pile charges the inductor connected in series with the at least one lower bridge switch, thereby increasing the voltage across the inductor. In the second stage, refer to FIG. 32 , which is a schematic diagram of current flow during the second stage of the charging system 200 operating in pre-charge mode, provided by an embodiment of the present application. As shown in Figure 32, the control module can control the sixth contactor K8, the fourth contactor K6 and the fifth contactor K7 to be closed, the first contactor K1, the second contactor K2, the third contactor K3 and the fifth contactor K9 to be disconnected, at least one upper bridge switch tube of the bridge arm module to be turned on, and the N lower bridge switches of the bridge arm module to be disconnected. At this time, due to the freewheeling effect of the inductor connected in series with the at least one upper bridge switch tube (the inductor connected in series with the at least one upper bridge switch tube, that is, the inductor connected in series with the at least one lower bridge switch tube), the DC charging pile and the inductor connected in series with the at least one upper bridge switch tube jointly charge the pre-charge capacitor C1, thereby realizing the pre-charging of the pre-charge capacitor C1 by the DC charging pile.

[0335] The durations of the first and second stages may be different, and the durations of the first and second stages may be designed according to the parameters of the inductor, the output voltage of the DC charging pile, and the parameters of the pre-charge capacitor C1.

[0336] It should be noted that, when the inductor connected in series to the at least one lower bridge switch is charged in the first stage, the inductor cannot be in a saturated state.

[0337] In the embodiment of the present application, when pre-charging capacitor C1, the DC charging pile and the inductor connected in series with the at least one upper bridge switch jointly charge pre-charging capacitor C1. Due to the freewheeling effect of the inductor, a sudden large charging current is not generated. This can avoid the generation of large currents during the pre-charging process and improve the safety of pre-charging.

[0338] In Figures 26 to 32, the inductive element 2011 is illustrated as three inductors. In the boost mode, buck mode, and pre-charge mode, the charging module can conduct only one of the three inductors or conduct them all at the same time. This is not limited in the present embodiment.

[0339] When only one of the three inductors is conducting, staggered conduction can be used. For example, consider the three inductors: L1, L2, and L3. In the current cycle, L1 is conducting; in the next cycle, L2 is conducting; and in the cycle after that, L3 is conducting. This staggered conduction of L1, L2, and L3 reduces inductor ripple.

[0340] In the embodiments of the present application, when the DC charging pile has a low output voltage, it operates in boost mode to achieve compatibility with low-voltage charging piles. On the other hand, for charging piles with high output voltages, it operates in buck mode to maximize the DC charging pile's power output while meeting the requirements for charging low-voltage vehicles or the vehicle's tolerance, thereby reducing charging time. By using both boost and buck modes, the compatibility and convenience of electric vehicle charging are improved. Both the boost and buck circuits in the embodiments of the present application involve inductors and switching transistors, effectively preventing the risk of a short circuit between the vehicle and the charging pile during charging. In direct charging mode, a pre-charge capacitor can be pre-charged to prevent the risk of a short circuit between the vehicle and the charging pile. The fifth contactor is closed in both boost and buck modes. Adding the fifth contactor distinguishes between driving and charging conditions. When driving or in similar operating conditions, the fifth contactor is disconnected to prevent the charging port from being energized while the electronic control is operating. If an uninformed operator accidentally touches the charging port or the corresponding area, this could result in an electric shock. When the fifth contactor is closed during charging, the above-mentioned risk of electric shock does not exist because the charging gun is already plugged in during charging.

[0341] In summary, the charging system in the present disclosure includes a charging circuit and a controller, and the charging circuit is connected to the controller. The charging circuit includes: an inductive element, a bridge arm module and a switch assembly, and the charging system is used to charge the power battery. One end of the switch assembly is suitable for being connected to the power supply device, and the other end is electrically connected to the first end of the inductive element, and the second end of the inductive element is suitable for being connected to the power battery through the bridge arm module. The controller controls the switch assembly and the bridge arm module according to the target charging mode to charge the power battery through the power supply device and / or the inductive element. The target charging mode includes: at least one of a boost charging mode, a buck charging mode and a direct charging mode. The present disclosure reuses the original inductive element and bridge arm module of the vehicle to pre-charge the pre-charge capacitor and charge the power battery according to the target charging mode, and can be compatible with power supply devices of different voltages without adding additional circuit structures.

[0342] FIG33 is a flow chart showing a charging control method according to an exemplary embodiment. As shown in FIG33 , the method includes:

[0343] Step S101 : determining a target charging mode from preset charging modes according to the output voltage of the power supply device and the battery voltage of the power battery.

[0344] For example, the power supply device in the present disclosure can be a charging pile or a DC power supply, such as a battery, and the present disclosure does not specifically limit this. The present disclosure can be applied to a charging circuit, wherein the charging circuit can include a pre-charge capacitor, a power battery, a switch component, an inductive element and a bridge arm module, the pre-charge capacitor and the power battery can be connected in parallel, one end of the switch component is suitable for connection to the power supply device, and the other end is electrically connected to the first end of the inductive element, and the second end of the inductive element is suitable for connection to the power battery through the bridge arm module. Among them, the bridge arm module can be a three-phase inverter circuit in the motor controller, and the inductive element can be an inductor in the motor, thereby realizing functional reuse of the motor controller and the motor module, simplifying the circuit structure and reducing production costs.

[0345] Because the output voltage of the power supply device and the battery voltage of the power battery do not necessarily match, after the power supply device is connected to the charging circuit, the corresponding target charging mode can be determined from the preset charging modes based on the relationship between the output voltage of the power supply device and the battery voltage of the power battery. The preset charging modes can include at least one of a boost charging mode, a buck charging mode, and a direct charging mode.

[0346] In some embodiments, when the output voltage of the power supply device is lower than the battery voltage of the power battery, the boost charging mode can be used as the target charging mode; when the output voltage of the power supply device is higher than the battery voltage of the power battery, and the difference between the output voltage and the battery voltage is higher than the first preset voltage threshold and lower than the second preset voltage threshold, the direct charging mode can be used as the target charging mode; when the output voltage of the power supply device is higher than the battery voltage of the power battery, and the difference between the output voltage and the battery voltage is higher than the second preset voltage threshold, the buck charging mode can be used as the target charging mode.

[0347] Step S102 : According to the target charging mode, the switch assembly, the inductive element, and the bridge arm module are controlled to pre-charge the pre-charge capacitor through the power supply device and / or the inductive element.

[0348] For example, different charging modes correspond to different switch states in the charging circuit, where the switch states include the states of the various switches in the switch assembly and the states of the various switches in the bridge arm module. After determining the target charging mode, the states of the various switches in the switch assembly and the states of the various switches in the bridge arm module can be controlled according to the target charging mode, thereby pre-charging the pre-charge capacitor through the power supply device and / or the inductive element.

[0349] In other embodiments, when the target charging mode is a boost charging mode, the pre-charge capacitor can be pre-charged by the power supply device and the inductive element, thereby achieving boost pre-charging of the pre-charge capacitor; when the target charging mode is a buck charging mode, the pre-charge capacitor can be pre-charged by the inductive element, thereby achieving buck pre-charging of the pre-charge capacitor; when the target charging mode is a direct charging mode, the pre-charge capacitor can be pre-charged by the power supply device, thereby achieving direct pre-charging of the pre-charge capacitor.

[0350] Step S103 , when pre-charging is completed, the switch assembly, the inductive element and the bridge arm module are controlled according to the target charging mode to charge the power battery through the power supply device and / or the inductive element.

[0351] For example, after the pre-charge capacitor is pre-charged, the states of various switches in the switch assembly and the states of various switches in the bridge arm module can be controlled according to the target charging mode, so as to charge the power battery through the power supply device and / or the inductive element.

[0352] In other embodiments, when the target charging mode is a boost charging mode, the power battery can be charged by the power supply device and the inductive element together, thereby achieving boost charging of the power battery; when the target charging mode is a buck charging mode, the power battery can be charged by the inductive element, thereby achieving buck charging of the power battery; when the target charging mode is a direct charging mode, the power battery can be charged by the power supply device, thereby achieving direct charging of the power battery.

[0353] In this way, when the output voltage of the power supply device is less than the charging voltage of the power battery, the power battery can be boosted and charged using the boost charging mode. When the output voltage of the power supply device is greater than the charging voltage of the power battery, the power battery can be bucked and charged using the buck charging mode, allowing the power supply device to output as much power as possible, thereby reducing charging time. When the output voltage of the power supply device meets the charging voltage of the power battery, the power battery can be directly charged using the direct charging mode, thereby being compatible with power supply devices of different voltages, improving charging flexibility and the compatibility of the power battery and the power supply device. Furthermore, by reusing the circuit structure of the vehicle's motor controller and motor, there is no need to add additional boost or buck circuit structures. Since the pre-charge capacitor is pre-charged by the power supply device, there is no need to add an additional pre-charge branch, simplifying the circuit structure and reducing production costs.

[0354] FIG34 is a flow chart of another charging control method according to an exemplary embodiment. As shown in FIG34 , the target charging mode may include a boost charging mode. Accordingly, step S102 may be implemented by the following steps:

[0355] Step S1021 , controlling the switch assembly and the bridge arm module to charge the inductive element through the power supply device.

[0356] Step S1022: Control the switch assembly and the bridge arm module to pre-charge the pre-charge capacitor simultaneously through the power supply device and the inductive element.

[0357] For example, when the target charging mode is the boost charging mode, the states of the switches in the switch assembly and the switches in the bridge arm module can be controlled according to the boost charging mode, so that the power supply device can charge the inductive element through the charging circuit. Then, the states of the switches in the switch assembly and the switches in the bridge arm module can be controlled so that the power supply device and the inductive element can simultaneously pre-charge the pre-charge capacitor, thereby achieving boost pre-charging of the pre-charge capacitor.

[0358] In some embodiments, steps S1021 and S1022 can be repeatedly performed in sequence according to the target frequency to periodically charge the inductive element, and the pre-charge capacitor can be pre-charged simultaneously through the power supply device and the inductive element, thereby achieving continuous boost pre-charging of the pre-charge capacitor. The target frequency can be a preset fixed value, or it can be calculated in real time during the pre-charging process. For example, the target frequency can be calculated based on the preset pre-charging time, the energy storage parameters of the inductive element, the parameters of each switch in the bridge arm module, and the actual output voltage of the power supply device. In one possible implementation method, the duty cycle of the PWM (English: Pulse Width Modulation, Chinese: Pulse Width Modulation) wave can be determined according to the target frequency, and the PWM wave can be used to control the charging circuit to repeatedly perform steps S1021 and S1022 according to the target frequency.

[0359] FIG35 is a flow chart of another charging control method according to an exemplary embodiment. As shown in FIG35 , when the target charging mode includes the boost charging mode, step S103 can be implemented by the following steps:

[0360] Step S1031 , controlling the switch assembly and the bridge arm module to charge the inductive element through the power supply device.

[0361] Step S1032: Control the switch assembly and the bridge arm module to charge the power battery simultaneously through the power supply device and the inductive element.

[0362] For example, when the target charging mode is the boost charging mode, the states of the switches in the switch assembly and the switches in the bridge arm module can be controlled according to the boost charging mode, so that the power supply device can charge the inductive element through the charging circuit. Then, the states of the switches in the switch assembly and the switches in the bridge arm module can be controlled so that the power supply device and the inductive element can charge the power battery simultaneously, thereby achieving boost charging of the power battery.

[0363] In some embodiments, step S1031 and step S1032 may be repeatedly executed in sequence according to the target frequency to periodically charge the energy storage module and simultaneously pre-charge the power battery through the power supply device and the inductive element, thereby achieving continuous boost charging of the power battery.

[0364] FIG36 is a flow chart of another charging control method according to an exemplary embodiment. As shown in FIG36 , the target charging mode may include a buck charging mode. Accordingly, step S102 may be implemented by the following steps:

[0365] Step S1023: Control the switch assembly and the bridge arm module to charge the inductive element and / or the pre-charge capacitor through the power supply device.

[0366] Step S1024 , controlling the switch assembly and the bridge arm module to pre-charge the pre-charge capacitor through the inductive element.

[0367] For example, when the target charging mode is the buck charging mode, the state of each switch in the switch assembly and the state of each switch in the bridge arm module can be controlled according to the buck charging mode, so that the power supply device can charge the inductive element through the charging circuit. The state of each switch in the switch assembly and the state of each switch in the bridge arm module can also be controlled so that the power supply device can charge the inductive element and the pre-charge capacitor in series through the charging circuit, and can achieve buck pre-charging of the pre-charge capacitor while charging the inductive element. Then, the state of each switch in the switch assembly and the state of each switch in the bridge arm module can be controlled so that the inductive element charges the pre-charge capacitor, thereby achieving buck pre-charging of the pre-charge capacitor.

[0368] In some embodiments, step S1023 and step S1024 may be repeatedly performed in sequence according to the target frequency to periodically charge the inductive element and pre-charge the pre-charge capacitor through the inductive element, thereby achieving continuous voltage reduction pre-charging of the pre-charge capacitor.

[0369] FIG37 is a flow chart of another charging control method according to an exemplary embodiment. As shown in FIG37 , when the target charging mode includes the buck charging mode, step S103 can be implemented by the following steps:

[0370] Step S1033: Control the switch assembly and the bridge arm module to charge the inductive element and / or the power battery through the power supply device.

[0371] Step S1034: Control the switch assembly and the bridge arm module to charge the power battery through the inductive element.

[0372] For example, when the target charging mode is the buck charging mode, the states of the switches in the switch assembly and the switches in the bridge arm module can be controlled according to the buck charging mode, so that the power supply device can charge the inductive element through the charging circuit. Alternatively, the states of the switches in the switch assembly and the switches in the bridge arm module can be controlled so that the power supply device can charge the inductive element and the power battery in series through the charging circuit, thereby simultaneously charging the inductive element and stepping down the power battery. Then, the states of the switches in the switch assembly and the switches in the bridge arm module can be controlled so that the inductive element charges the power battery, thereby stepping down the power battery.

[0373] In some embodiments, step S1033 and step S1034 may be repeatedly performed in sequence according to the target frequency to periodically charge the inductive element, and charge the power battery through the inductive element, thereby achieving continuous voltage reduction charging of the power battery.

[0374] According to other embodiments of the present disclosure, the target charging mode may include a direct charging mode. According to the target charging mode, step S102 may be implemented in the following manner:

[0375] Control the switch assembly and the bridge arm module to pre-charge the pre-charge capacitor through the power supply device.

[0376] When the target charging mode includes the direct charging mode, step S103 can be implemented in the following manner:

[0377] Control the switch assembly and bridge arm module to charge the power battery through the power supply device.

[0378] For example, when the target charging mode is the direct charging mode, the state of each switch in the switch assembly and the state of each switch in the bridge arm module can be controlled according to the target direct charging mode, so that the pre-charge capacitor can be pre-charged directly through the power supply device.

[0379] After the pre-charging is completed, the state of each switch in the switch assembly and the state of each switch in the bridge arm module can be controlled according to the direct charging mode, so as to directly charge the power battery through the power supply device.

[0380] In summary, the present disclosure first determines the target charging mode from the preset charging modes based on the output voltage of the power supply device and the battery voltage of the power battery, wherein the preset charging mode includes at least one of a boost charging mode, a buck charging mode and a direct charging mode. Then, according to the target charging mode, the switch assembly and the bridge arm module are controlled to pre-charge the pre-charge capacitor through the power supply device and / or the inductive element, and when the pre-charging is completed, the switch assembly and the inductive element are controlled according to the target charging mode to charge the power battery through the power supply device and / or the inductive element. The present disclosure reuses the original inductive element and bridge arm module of the vehicle to pre-charge the pre-charge capacitor and charge the power battery according to the target charging mode. It is compatible with power supply devices of different voltages without adding additional circuit structures, and pre-charges the pre-charge capacitor through the power supply device without adding additional pre-charging branches, thereby simplifying the circuit structure and reducing production costs.

[0381] Figure 38 is a block diagram of a controller according to an exemplary embodiment. As shown in Figure 38, the controller 202 may include a processor 2021 and a memory 2022. The controller 202 may also include one or more of a multimedia component 2023, an input / output (I / O) interface 2024, and a communication component 2025.

[0382] The processor 2021 is used to control the overall operation of the controller 202 to complete all or part of the steps in the above-mentioned charging control method. The memory 2022 is used to store various types of data to support the operation of the controller 202. Such data may include, for example, instructions for any application or method operating on the controller 202, as well as application-related data, such as contact information, sent and received messages, images, audio, video, etc. The memory 2022 can be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The multimedia component 2023 may include a screen and an audio component. The screen may be, for example, a touch screen, and the audio component is used to output and / or input audio signals. For example, the audio component may include a microphone for receiving external audio signals. The received audio signals may be further stored in the memory 2022 or transmitted via the communication component 2025. The audio component also includes at least one speaker for outputting audio signals. The I / O interface 2024 provides an interface between the processor 2021 and other interface modules, which may be a keyboard, a mouse, buttons, etc. These buttons may be virtual buttons or physical buttons. The communication component 2025 is used for wired or wireless communication between the controller 202 and other devices. Wireless communication, such as Wi-Fi, Bluetooth, Near Field Communication (NFC), 2G, 3G, 4G, NB-IOT, eMTC, or other 5G, etc., or a combination of one or more thereof, is not limited here. Therefore, the corresponding communication component 2025 may include: a Wi-Fi module, a Bluetooth module, an NFC module, etc.

[0383] In an exemplary embodiment, the controller 202 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the above-described charging control method.

[0384] In another exemplary embodiment, a computer-readable storage medium including program instructions is also provided. When executed by a processor, the program instructions implement the steps of the above-described charging control method. For example, the computer-readable storage medium may be the aforementioned memory 2022 including the program instructions. The program instructions may be executed by the processor 2021 of the controller 202 to implement the above-described charging control method.

[0385] FIG39 is a block diagram of a vehicle according to an exemplary embodiment. As shown in FIG39 , the vehicle 500 is provided with a controller 202 .

[0386] FIG40 is a block diagram of another vehicle according to an exemplary embodiment. As shown in FIG40 , the vehicle 500 is provided with a charging system 200 .

[0387] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0388] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0389] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A charging system (200), characterized in that: The charging system (200) comprises: a controller (202); and A charging circuit (201), the charging circuit (201) being connected to the controller (202), the charging system being used to charge the power battery (300), the charging circuit (201) comprising: Sensual Elements (2011); Bridge Arm Module (2012); and a switch component (2013); one end of the switch component (2013) is suitable for being connected to the power supply device (400), and the other end is connected to the first end of the inductive element (2011); the second end of the inductive element (2011) is suitable for being connected to the power battery (300) via the bridge arm module (2012); The controller (202) is used to control the switch component (2013) and the bridge arm module (2012) according to the target charging mode, so as to charge the power battery (300) through the power supply device (400) and / or the inductive element (2011), wherein the target charging mode includes at least one of a boost charging mode, a buck charging mode and a direct charging mode.

2. The charging system according to claim 1, wherein: The controller (202) is further configured to: The target charging mode is determined from preset charging modes according to the output voltage of the power supply device (400) and the battery voltage of the power battery (300).

3. The charging system according to claim 1 or 2, characterized in that: The switch assembly (2013) comprises a first switch assembly (2013a) and a second switch assembly (2013b); The power battery (300) is suitable for being connected to the power supply device (400) through the first switch component (2013a) and the second switch component (2013b); the power battery (300) is also suitable for being connected to the bridge arm module (2012) through the first switch component (2013a); and the inductive element (2011) is suitable for being connected to the power supply device (400) through the second switch component (2013b).

4. The charging system according to claim 3, wherein: The charging circuit (201) further includes: a pre-charge capacitor (C1); The pre-charge capacitor (C1) is suitable for being connected in parallel with the power battery (300) via the first switch component (2013a), and the pre-charge capacitor (C1) is also connected to the bridge arm module (2012); The controller (202) is used to control the switch component (2013) and the bridge arm module (2012) according to the target charging mode, so as to pre-charge the pre-charge capacitor (C1) through the power supply device (400) and / or the inductive element (2011).

5. The charging system according to any one of claims 1 to 4, characterized in that: The charging circuit (201) further includes: a filter capacitor (C2); One end of the filter capacitor (C2) is connected to the bridge arm module (2012), and the other end of the filter capacitor (C2) is connected to the inductive element (2011).

6. The charging system according to claim 4, characterized in that The first end of the pre-charge capacitor (C1) is connected to the upper bridge arm of the bridge arm module (2012), the second end of the pre-charge capacitor (C1) is connected to the lower bridge arm of the bridge arm module (2012), the midpoint of the bridge arm of the bridge arm module (2012) is connected to the first end of the inductive element (2011), and the second end of the inductive element (2011) is connected to the second switch component (2013b); the upper bridge arm of the bridge arm module (2012) is also connected to the second switch component (2013b), and the lower bridge arm of the bridge arm module (2012) is also connected to the second switch component (2013b).

7. The charging system according to claim 6, characterized in that The first switch component (2013a) comprises: a first contactor (K1), wherein a first end of the first contactor (K1) is suitable for being connected to a first end of the power battery (300), and a second end of the first contactor (K1) is connected to a first end of the pre-charge capacitor (C1); a second contactor (K2), wherein a first end of the second contactor (K2) is adapted to be connected to a second end of the power battery (300), and a second end of the second contactor (K2) is connected to a second end of the pre-charge capacitor (C1); and a third contactor (K3), wherein a first end of the third contactor (K3) is suitable for being connected to a first end of the power battery (300), and a second end of the third contactor (K3) is connected to a second end of the inductive element (2011); The second switch component (2013b) comprises: a first switch tube (K4), wherein a first end of the first switch tube (K4) is connected to the upper bridge arm of the bridge arm module (2012), and a second end of the first switch tube (K4) is suitable for being connected to the first end of the power supply device (400); a fourth contactor (K6), wherein a first end of the fourth contactor (K6) is connected to the lower bridge arm of the bridge arm module (2012), and a second end of the fourth contactor (K6) is suitable for being connected to the second end of the power supply device (400); and A second switching tube (K5), wherein a first end of the second switching tube (K5) is connected to a second end of the inductive element (2011), and a second end of the second switching tube (K5) is suitable for being connected to a first end of the power supply device (400).

8. The charging system according to claim 7, characterized in that: The controller (202) is specifically configured to: closing the fourth contactor (K6), turning on the second switch tube (K5), and disconnecting the first contactor (K1), the second contactor (K2), the third contactor (K3), and the first switch tube (K4); Periodically controlling the switching tubes of the upper bridge arm and the lower bridge arm of the bridge arm module (2012) to be alternately turned on, so as to boost and pre-charge the pre-charge capacitor (C1) according to the boost charging mode; The controller (202) is specifically configured to: closing the first contactor (K1), the second contactor (K2), the fourth contactor (K6) and the second switch tube (K5), and opening the third contactor (K3) and the first switch tube (K4); The upper bridge and the lower bridge of the bridge arm module (2012) are periodically controlled to be alternately turned on, so as to perform boost charging for the power battery (300) according to the boost charging mode.

9. The charging system according to claim 7 or 8, characterized in that: The controller (202) is specifically configured to: closing the fourth contactor (K6), turning on the switch tube of the upper bridge arm of the bridge arm module (2012), and disconnecting the first contactor (K1), the second contactor (K2), the third contactor (K3), the first switch tube (K4), and the switch tube of the lower bridge arm of the bridge arm module (2012); Periodically turning on the second switch tube (K5) to perform voltage reduction pre-charging for the pre-charge capacitor (C1) according to the voltage reduction charging mode; The controller (202) is specifically configured to: closing the second contactor (K2), the third contactor (K3), the first switch tube (K4) and the fourth contactor (K6), and opening the first contactor (K1) and the second switch tube (K5); The switch tube of the upper bridge arm and the switch tube of the lower bridge arm of the bridge arm module (2012) are periodically controlled to be alternately turned on, so as to perform step-down charging for the power battery (300) according to the step-down charging mode.

10. The charging system according to any one of claims 7 to 9, characterized in that: The controller (202) is specifically configured to: closing the fourth contactor (K6), and disconnecting the first contactor (K1), the second contactor (K2), the third contactor (K3), the second switch tube (K5), and the switch tubes of the upper bridge arm and the lower bridge arm of the bridge arm module (2012); Periodically turning on the first switch tube (K4) to directly pre-charge the pre-charge capacitor (C1) according to the direct charging mode; The controller (202) is specifically configured to: closing the first contactor (K1), the second contactor (K2), and the fourth contactor (K6), and disconnecting the third contactor (K3), the second switch tube (K5), and the switch tube of the upper bridge arm and the switch tube of the lower bridge arm of the bridge arm module (2012); The first switch tube (K4) is periodically turned on, and after the output voltage of the power supply device (400) is maintained within a preset voltage range, the first switch tube (K4) is kept turned on to directly charge the power battery (300) in the direct charging mode.

11. The charging system according to claim 1, wherein: The switch assembly (2013) comprises: a switch tube; One end of the switch tube is suitable for being electrically connected to the power supply device (400) via the charging port (J), and the other end is connected to the first end of the inductive element (2011); The second end of the inductive element (2011) is suitable for being electrically connected to the power battery (300) through the bridge arm module (2012); The controller (202) is used to: When the charging system (200) operates in a boost charging mode, the operating state of the switch tube is controlled, and a boost charging circuit is formed using the inductive element (2011) and the bridge arm module (2012), so as to boost the voltage received by the charging port (J) and charge the power battery (300); When the charging system (200) operates in a step-down charging mode, the operating state of the switch component (2013) is controlled, and a step-down charging circuit is formed using the inductive element (2011) and the bridge arm module (2012), so as to charge the power battery (300) after reducing the voltage received by the charging port (J).

12. The charging system according to claim 11, characterized in that: The switch assembly (2013) comprises: a first switch tube (K4), wherein a first end of the first switch tube (K4) is adapted to be electrically connected to a first end of the charging port (J); The second end of the first switch tube (K4) is electrically connected to the first end of the inductive element (2011); and a second switching tube (K5), wherein a first end of the second switching tube (K5) is electrically connected to a first end of the inductive element (2011); The second end of the second switch tube (K5) is suitable for being electrically connected to the second end of the charging port (J); The second end of the first switching tube (K4) is electrically connected to the first end of the second switching tube (K5), and the electrical connection point is electrically connected to the first end of the inductive element (2011).

13. The charging system according to claim 11 or 12, characterized in that: The charging system (200) further includes: a filter capacitor (C2); One end of the filter capacitor (C2) is electrically connected to the first end of the inductive element (2011), and the other end is electrically connected to the negative terminal of the bridge arm module (2012); The filter capacitor (C2) is used to filter the electric energy received by the charging port (J).

14. The charging system according to any one of claims 11 to 13, characterized in that: The charging system (200) further includes: a fifth contactor (K7) or a fourth contactor (K6); One end of the fifth contactor (K7) is electrically connected to the second end of the switch tube, and the other end is connected to the first end of the inductive element (2011); The fifth contactor (K7) is used to control the on / off of the circuit between the second end of the switch tube and the first end of the inductive element (2011); One end of the fourth contactor (K6) is electrically connected to the negative terminal of the bridge arm module (2012), and the other end is suitable for being electrically connected to the second end of the charging port (J); The fourth contactor (K6) is used to control the on / off of the circuit between the charging port (J) and the negative terminal of the bridge arm module (2012).

15. The charging system according to any one of claims 12 to 14, characterized in that: The first switching tube (K4) includes: a first field effect transistor, wherein a first end of the first field effect transistor is adapted to be electrically connected to a first end of the charging port (J), a third end of the first field effect transistor is adapted to receive a first control signal, and a second end of the first field effect transistor is electrically connected to a first end of the inductive element (2011); The second switch tube (K5) includes: A second field effect transistor, wherein a first end of the second field effect transistor is electrically connected to a first end of the inductive element (2011), a third end is suitable for receiving the second control signal, and a second end is electrically connected to a second end of the charging port (J) and a negative terminal of the power battery (300), respectively.

16. The charging system according to any one of claims 12 to 15, characterized in that: The inductive element (2011) comprises: N-phase windings; the bridge arm module (2012) comprises: N bridge arms connected in parallel; The first end of the N-phase winding is electrically connected to the other end of the switch tube; The second ends of the N-phase windings are connected to the midpoints of the N bridge arms in a one-to-one correspondence, where N is an integer greater than or equal to 1.

17. The charging system according to claim 16, characterized in that The controller (202) is specifically configured to: When the charging system (200) operates in a boost charging mode, the first switch tube (K4) is controlled to be closed, the second switch tube (K5) is controlled to be disconnected, and the upper bridge of each of the N bridge arms is controlled to be closed, and the lower bridge of at least one bridge arm is controlled to be turned on for a first preset time, so that the electric energy received by the charging port (J) is used to charge the N-phase winding; After the first preset time is passed, the lower bridges of the N bridge arms are controlled to be closed and the upper bridge of at least one bridge arm is turned on, so that the charging port (J) and the N-phase winding jointly charge the power battery (300); The above process is repeated until charging is completed.

18. The charging system according to claim 16 or 17, characterized in that: The controller (202) is specifically configured to: When the charging system (200) operates in a step-down charging mode, in the first stage, the first switch tube (K4) is controlled to be closed, the second switch tube (K5) is controlled to be disconnected, and the lower bridges of the N bridge arms are controlled to be closed, and the upper bridge of at least one bridge arm is controlled to be turned on, so that the charging port (J) charges the N-phase winding and the power battery (300) simultaneously; In the second stage, the first switch tube (K4) is controlled to be disconnected, the second switch tube (K5) is controlled to be closed, and the lower bridge of each of the N bridge arms is controlled to be closed and the upper bridge of at least one bridge arm is controlled to be turned on, so that the N-phase winding is freewheeled to reduce the voltage and charge the power battery (300); The above process is repeated until charging is completed.

19. The charging system according to any one of claims 16 to 18, characterized in that: The charging system (200) further includes: a pre-charging capacitor (C1), a first contactor (K1), and a second contactor (K2); The pre-charge capacitor (C1) is electrically connected to the positive terminal and the negative terminal of the power battery (300); The controller (202) is specifically configured to: When the charging system (200) operates in a boost pre-charging mode, the first switch tube (K4) is controlled to be closed, the second switch tube (K5) is controlled to be disconnected, the first contactor (K1) and the second contactor (K2) are controlled to be disconnected, and the upper bridge of each of the N bridge arms is controlled to be closed, and the lower bridge of at least one bridge arm is controlled to be turned on for a second preset time, so that the electric energy received by the charging port (J) or the electric energy provided by the in-vehicle power supply is used to charge the three-phase winding; After the second preset time, the lower bridges of the N bridge arms are controlled to be closed and the upper bridge of at least one bridge arm is turned on, so that the electric energy received by the charging port (J) or the electric energy provided by the in-vehicle power supply and the three-phase winding freewheeling jointly charge the pre-charge capacitor (C1), and the process is repeated until the voltage of the pre-charge capacitor (C1) and the current real-time voltage of the power battery (300) differ within a preset range; When the charging system (200) operates in a step-down pre-charging mode, in the first stage, the first contactor (K1) and the second contactor (K2) are controlled to be disconnected, the first switch tube (K4) is closed, the second switch tube (K5) is disconnected, and the lower bridges of the N bridge arms are controlled to be closed and the upper bridge of at least one bridge arm is controlled to be turned on. Then, the electric energy received by the charging port (J) or the electric energy provided by the in-vehicle power supply is used to charge the N-phase winding and the pre-charging capacitor (C1) simultaneously; In the second stage, the first contactor (K1) and the second contactor (K2) are controlled to be disconnected, the first switch tube (K4) is disconnected, the second switch tube (K5) is closed, and the lower bridge of each of the N bridge arms is controlled to be closed and the upper bridge of at least one bridge arm is turned on, so that the N-phase winding continues to charge the pre-charge capacitor (C1) by freewheeling, and the process is repeated until the difference between the voltage of the pre-charge capacitor (C1) and the current real-time voltage of the power battery (300) is within a preset range; When the charging system (200) operates in a direct pre-charging mode, the first switch tube (K4) is controlled to be closed, the second switch tube (K5) is controlled to be disconnected, the first contactor (K1) and the second contactor (K2) are controlled to be disconnected, and the lower bridge of each of the N bridge arms is controlled to be closed, and the upper bridge of at least one bridge arm is controlled to be connected. Then, the electric energy received by the charging port (J) or the electric energy provided by the in-vehicle power supply is input to the pre-charging capacitor (C1) through the N-phase winding and the upper bridge of the at least one bridge arm, and the pre-charging capacitor (C1) is directly charged until the voltage of the pre-charging capacitor (C1) is within a preset range of the current real-time voltage of the power battery (300).

20. The system according to claim 1, wherein The power supply device (400) includes a DC power supply; The first end of the bridge arm module (2012) is suitable for being connected to the positive electrode of the power battery (300), the second end of the bridge arm module (2012) is suitable for being connected to the negative electrode of the power battery (300), the first end of the inductive element (2011) is suitable for being connected to a DC power supply via the switch assembly (2013), the midpoint of the bridge arm of the bridge arm module (2012) is connected to the second end of the inductive element (2011); and the second end of the bridge arm module (2012) is suitable for being connected to the DC power supply; When the charging system (200) operates in a boost mode, the controller (202) controls the switching state of the switch component (2013) so that the bridge arm module (2012) and the inductive element (2011) form a boost circuit; When the charging system (200) operates in a step-down mode, the controller (202) controls the switching state of the switch component (2013) so that the bridge arm module (2012) and the inductive element (2011) form a step-down circuit.

21. The charging system according to claim 20, wherein: The switch assembly (2013) comprises: a first contactor (K1), the positive electrode of the power battery (300) being suitable for connecting to a first end of the first contactor (K1), and a second end of the first contactor (K1) being connected to a first end of the bridge arm module (2012); and A second contactor (K2), the negative electrode of the power battery (300) is suitable for connecting to a first end of the second contactor (K2), and a second end of the second contactor (K2) is connected to a second end of the bridge arm module (2012).

22. The charging system according to claim 21, characterized in that The switch assembly (2013) further includes: a third contactor (K3), a sixth contactor (K8), and a seventh contactor (K9); the first end of the first contactor (K1) is connected to the first end of the third contactor (K3); the second end of the first contactor (K1) is connected to the first end of the seventh contactor (K9); the second end of the seventh contactor (K9) is suitable for connecting the positive pole of a DC power supply and the first end of the sixth contactor (K8); the second end of the third contactor (K3) is connected to the second end of the sixth contactor (K8); the second end of the sixth contactor (K8) is suitable for connecting to the first end of the inductive element (2011); and the negative pole of the DC power supply is suitable for connecting to the second end of the bridge arm module (2012).

23. The charging system according to claim 22, wherein: The charging system (200) further includes a pre-charge capacitor (C1), the second end of the first contactor (K1) is connected to the first end of the pre-charge capacitor (C1), and the second end of the second contactor (K2) is connected to the second end of the pre-charge capacitor (C1).

24. The charging system according to claim 22 or 23, characterized in that: The bridge arm module (2012) includes N bridge arm units connected in parallel, each bridge arm unit includes an upper bridge switch tube and a lower bridge switch tube connected in series; the inductive element (2011) includes N inductors; the first ends of the N inductors are connected to the second ends of the sixth contactor (K8), and the second ends of the N inductors are connected one-to-one with the bridge arm midpoints of the N bridge arm units, the bridge arm midpoint of each bridge arm unit is the connection point of the upper bridge switch tube and the lower bridge switch tube of each bridge arm unit, and N is an integer greater than or equal to 1.

25. The charging system according to claim 24, characterized in that The switch assembly (2013) further comprises: a fourth contactor (K6), wherein the negative electrode of the DC power supply is suitable for connecting to a first end of the fourth contactor (K6), and a second end of the fourth contactor (K6) is connected to a second end of the second contactor (K2); and A fifth contactor (K7), a second end of the sixth contactor (K8) is connected to the first end of the fifth contactor (K7), and a second end of the fifth contactor (K7) is connected to the first end of the inductive element (2011).

26. The charging system according to claim 25, characterized in that The charging system (200) further comprises a filter capacitor (C2), wherein a first end of the filter capacitor (C2) is connected to a second end of the sixth contactor (K8), and a second end of the filter capacitor (C2) is connected to a second end of the fourth contactor (K6).

27. The charging system according to claim 25 or 26, characterized in that: The controller (202) controls the switching state of the switch component (2013) so that the bridge arm module (2012) and the inductive element (2011) form a boost circuit, comprising: The controller (202) controls the sixth contactor (K8), the fourth contactor (K6), and the fifth contactor (K7) to be closed, the third contactor (K3) and the seventh contactor (K9) to be disconnected, at least one lower bridge switch tube of the bridge arm module (2012) to be turned on, and N upper bridge switch tubes of the bridge arm module (2012) to be disconnected, so that the DC power supply charges the inductive element (2011); In the second stage, the controller (202) controls the first contactor (K1), the second contactor (K2), the sixth contactor (K8), the fourth contactor (K6), and the fifth contactor (K7) to be closed, the third contactor (K3) and the seventh contactor (K9) to be disconnected, at least one upper bridge switch tube of the bridge arm module (2012) to be turned on, and N lower bridge switch tubes of the bridge arm module (2012) to be disconnected, so that the DC power supply and the inductive element (2011) charge the power battery (300).

28. The charging system according to claim 25 or 26, characterized in that The controller (202) controls the switching state of the switch component (2013) so that the bridge arm module (2012) and the inductive element (2011) form a step-down circuit, comprising: The controller (202) controls the second contactor (K2), the third contactor (K3), the seventh contactor (K9), the fourth contactor (K6), and the fifth contactor (K7) to be closed, the first contactor (K1) and the sixth contactor (K8) to be disconnected, at least one upper bridge switch tube of the bridge arm module (2012) to be turned on, and N lower bridge switch tubes of the bridge arm module (2012) to be disconnected, so that the DC power supply charges the inductive element (2011) and the power battery (300); In the second stage, the controller (202) controls the second contactor (K2), the third contactor (K3), and the fifth contactor (K7) to be closed, the first contactor (K1) and the sixth contactor (K8) to be disconnected, at least one lower bridge switch tube of the bridge arm module (2012) to be turned on, and N upper bridge switch tubes of the bridge arm module (2012) to be disconnected, so that the inductive element (2011) charges the power battery (300).

29. The charging system according to any one of claims 20 to 28, characterized in that: When the charging system (200) operates in a pre-charging mode, the controller (202) controls the switching state of the switch component (2013) so that the bridge arm module (2012) and the inductive element (2011) form a pre-charging circuit.

30. The charging system according to claim 25 or 26, characterized in that When the charging system (200) operates in a pre-charging mode, the controller (202) controls the switching state of the switch component (2013) so that the bridge arm module (2012) and the inductive element (2011) form a pre-charging circuit, comprising: The controller (202) controls the sixth contactor (K8), the fourth contactor (K6), and the fifth contactor (K7) to be closed in the first stage, the first contactor (K1), the second contactor (K2), the third contactor (K3), and the seventh contactor (K9) to be disconnected, at least one lower bridge switch tube of the bridge arm module (2012) to be turned on, and the N upper bridge switch tubes of the bridge arm module (2012) to be turned off, so that the DC power supply charges the inductive element (2011); In the second stage, the controller (202) controls the sixth contactor (K8), the fourth contactor (K6), and the fifth contactor (K7) to be closed, the first contactor (K1), the second contactor (K2), the third contactor (K3), and the seventh contactor (K9) to be disconnected, at least one upper bridge switch tube of the bridge arm module (2012) to be turned on, and N lower bridge switch tubes of the bridge arm module (2012) to be disconnected, so that the DC power supply and the inductive element (2011) charge the pre-charge capacitor (C1).

31. A charging control method, characterized in that: The method comprises: Determining a target charging mode from preset charging modes according to the output voltage of the power supply device and the battery voltage of the power battery, wherein the preset charging mode includes at least one of a boost charging mode, a buck charging mode, and a direct charging mode; According to the target charging mode, the switch assembly and the energy storage module are controlled to charge the power battery through the power supply device and / or the energy storage module.

32. A controller (202), characterized in that include: a memory having a computer program stored thereon; A processor, configured to execute the computer program in the memory to implement the steps of the method according to claim 31.

33. A vehicle (500), characterized in that The vehicle comprises the controller (202) of claim 32, or the charging system (200) of any one of claims 1-30.

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