Electric-vehicle charging circuit and apparatus

Abstract

An electric-vehicle charging circuit and apparatus. The circuit comprises an electric-motor controller (100), a changeover switch (200) and an electric motor, wherein one side of the electric-motor controller (100) is connected to a battery pack, and the other side of the electric-motor controller (100) is connected to stator windings (300) of the electric motor; the stator windings (300) are connected by means of the changeover switch (200), and each of the stator windings (300) is also configured to be connected to an external alternating-current power supply (400); in a charging mode, the changeover switch (200) disconnects the stator windings (300); and the electric-motor controller (100) converts alternating currents from the stator windings (300) into direct currents and outputs the direct currents to the battery pack, thereby reusing an electrical circuit of the electric-motor controller (100) to charge the battery pack.

Description

Electric vehicle charging circuit and device

[0001] The present application claims priority to Chinese Patent Application No. 202410522607.X, filed on April 28, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of electric vehicles, in particular to an electric vehicle charging circuit and device. BACKGROUND

[0003] With the popularity of electric vehicles, the demand for charging is increasing. Currently, there are two main charging methods for electric vehicles: AC slow charging and DC fast charging. AC charging converts AC power from an external power grid into DC power through a vehicle-mounted charger to charge the power battery. DC charging converts 380V three-phase AC power from the power grid into DC power through a DC charging pile to charge the power battery.

[0004] However, the above charging methods require additional circuits in additional equipment (such as vehicle-mounted chargers or charging piles) to convert AC power into DC power, which increases the cost of using the vehicle.

[0005] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. TECHNICAL PROBLEM

[0006] The main purpose of the present application is to provide an electric vehicle charging circuit and device, which aims to solve the technical problem that the above-mentioned DC charging method requires additional circuits in additional equipment, such as vehicle-mounted chargers or charging piles, to convert AC power into DC power, which increases the cost of using the vehicle. TECHNICAL SOLUTION

[0007] To achieve the above purpose, the present application provides an electric vehicle charging circuit, which comprises: a motor controller, a switching switch and a motor.

[0008] One side of the motor controller is connected to the battery pack, and the other side of the motor controller is connected to each stator winding of the motor. Each stator winding is connected through the switching switch, and each stator winding is also used to connect an external AC power supply.

[0009] The switching switch is used to disconnect the connection between each stator winding in the charging mode.

[0010] The motor controller is used to convert AC power from each stator winding into DC power when the connection between each stator winding is disconnected, and the AC power is provided by the external AC power supply.

[0011] The motor controller is further configured to output the direct current to the battery pack to charge the battery pack.

[0012] In an embodiment, the stator winding is configured to filter the alternating current output by the external alternating current power source in the charging mode and output the filtered alternating current to the motor controller.

[0013] The motor controller is further configured to rectify the filtered alternating current to obtain the direct current.

[0014] In an embodiment, the motor controller is further configured to invert the direct current input by the battery pack into frequency-adjustable three-phase alternating current in the driving mode and output the three-phase alternating current to each of the motor stator windings.

[0015] The motor stator winding is configured to generate a rotating magnetic field based on the received three-phase alternating current to drive the electric vehicle to move by synchronously rotating the rotor following the rotating magnetic field.

[0016] In an embodiment, the rotor is provided with an excitation winding.

[0017] The excitation winding is connected to an external direct current power source.

[0018] The excitation winding is configured to output external direct current from the external direct current power source to the rotor to form a rotor magnetic field on the rotor.

[0019] The rotor is configured to synchronously rotate following the rotating magnetic field by the rotor magnetic field to drive the motor shaft to rotate, so that the rotating torque generated by the rotation of the motor shaft drives the electric vehicle to move through a transmission system.

[0020] In an embodiment, the excitation winding is disconnected from the external direct current power source in the charging mode.

[0021] In an embodiment, each of the motor stator windings comprises a first inductor, a second inductor, and a third inductor.

[0022] The switching switch comprises a first switch and a second switch.

[0023] A first end of the first switch is connected to a first end of the first inductor, a second end of the first switch is connected to a first end of the second inductor and a first end of the second switch respectively, and a second end of the second switch is connected to a first end of the third inductor.

[0024] A second end of the first inductor, a second end of the second inductor, and a second end of the third inductor are all connected to the motor controller.

[0025] In an embodiment, the circuit further comprises a bus capacitor;

[0026] The motor controller comprises a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT and a sixth IGBT;

[0027] The collector of the first IGBT, the collector of the second IGBT and the collector of the third IGBT are connected with the positive pole of the battery pack;

[0028] The emitter of the first IGBT is connected with the collector of the fourth IGBT and the second end of the first inductor respectively, the emitter of the second IGBT is connected with the collector of the fifth IGBT, the second end of the first inductor and the second end of the second inductor respectively, and the emitter of the third IGBT is connected with the collector of the sixth IGBT, the second end of the first inductor and the second end of the third inductor respectively;

[0029] The emitter of the fourth IGBT, the emitter of the fifth IGBT and the emitter of the sixth IGBT are connected with the negative pole of the battery pack;

[0030] The first end of the bus capacitor is connected with the positive pole of the battery pack, and the second end of the bus capacitor is connected with the negative pole of the battery pack.

[0031] In an embodiment, the external AC power supply is a three-phase AC power supply;

[0032] In the charging mode, the first end of the first inductor is further used for connecting the C phase of the external AC power supply, the first end of the second inductor is further used for connecting the B phase of the external AC power supply, and the first end of the third inductor is further used for connecting the A phase of the external AC power supply.

[0033] In an embodiment, the motor is an electrically excited synchronous motor.

[0034] In addition, in order to achieve the above-mentioned purpose, the application further provides an electric vehicle charging device, which comprises the electric vehicle charging circuit as described above. Advantages

[0035] The application provides an electric vehicle charging circuit and device, the circuit comprising a motor controller, a switching switch and a motor; one side of the motor controller is connected with a battery pack, the other side of the motor controller is connected with each stator winding of the motor respectively, each stator winding is connected through the switching switch, and each stator winding is also used for connecting an external AC power supply; the application disconnects the connection between each stator winding in the charging mode through the switching switch; the motor controller converts AC power from each stator winding into DC power when the connection between each stator winding is disconnected, and the AC power is provided by the external AC power supply; the motor controller outputs the DC power to the battery pack to charge the battery pack. The above-mentioned circuit of the application converts the AC power of the external power supply into DC power through the motor controller when charging, so that the electric circuit containing the motor controller is multiplexed to charge the battery pack, without additionally setting a corresponding circuit in additional equipment such as a vehicle-mounted charger or a charging pile, thereby effectively reducing the vehicle cost. BRIEF DESCRIPTION OF DRAWINGS

[0036] Fig. 1 is a structural schematic diagram of the first embodiment of the electric vehicle charging circuit of the application;

[0037] Fig. 2 is a circuit principle diagram of the second embodiment of the electric vehicle charging circuit of the application in the driving mode;

[0038] Fig. 3 is a circuit principle diagram of the second embodiment of the electric vehicle charging circuit of the application in the charging mode.

[0039] Explanation of reference numerals:

[0040] Reference numeral Name Reference numeral Name BT battery pack Cap capacitor Q1 first IGBT Q2 second IGBT Q3 third IGBT Q4 fourth IGBT Q5 fifth IGBT Q6 sixth IGBT L1 first inductor L2 second inductor L3 third inductor S1 first switch S2 second switch

[0041] The implementation, functional features and advantages of the application will be further described with reference to the embodiments and the accompanying drawings. Embodiment of the application

[0042] It should be understood that the specific embodiments described herein are merely intended to explain the application and are not intended to limit the application.

[0043] The technical solutions of the application will be described clearly and completely in the embodiments of the application with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the application, but not all the embodiments of the application. Based on the embodiments in the application, all the embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application.

[0044] The description of "first", "second", and the like in the embodiments of the present application is only for the purpose of description and can not be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features, and the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the person skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0045] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a first embodiment of the electric vehicle charging circuit of the present application.

[0046] As shown in FIG. 1, in the present embodiment, the electric vehicle charging circuit comprises a motor controller 100, a battery pack BT, a switching switch 200 and a motor.

[0047] One side of the motor controller 100 is connected with the battery pack BT, and the other side of the motor controller 100 is connected with each stator winding 300 of the motor respectively, each stator winding 300 is connected through the switching switch 200, and each motor stator winding 300 is further used for connecting an external AC power supply 400.

[0048] As shown in FIG. 1, the motor stator winding 300 comprises a first inductor L1, a second inductor L2 and a third inductor L3.

[0049] The switching switch 200 comprises a first switch S1 and a second switch S2.

[0050] The first end of the first switch S1 is connected with the first end of the first inductor L1, the second end of the first switch S1 is connected with the first end of the second inductor L2 and the first end of the second switch S2 respectively, and the second end of the second switch S2 is connected with the first end of the third inductor L3; the second end of the first inductor L1, the second end of the second inductor L2 and the second end of the third inductor L3 are all connected with the motor controller 100; the first end of the bus capacitor Cap is connected with the positive pole of the battery pack BT, and the second end of the bus capacitor Cap is connected with the negative pole of the battery pack BAT.

[0051] In the charging process, the voltage and current of the battery pack BT may fluctuate or mutate. The bus capacitor Cap can absorb and release energy, play a role in buffering voltage fluctuations, so that the voltage in the motor controller 100 remains stable, avoiding damage to the motor and other electronic components due to voltage mutation. Moreover, the bus capacitor Cap helps to reduce electromagnetic interference in the circuit, protecting the motor controller 100 and other electric vehicle subsystems from adverse effects such as voltage spikes, surges, etc. In addition, by optimizing the voltage waveform and reducing energy loss, the bus capacitor Cap can improve the efficiency of the power supply, making the battery pack BT charging more efficient.

[0052] The switching switch 200 is used to disconnect the connections between the stator windings 300 in the charging mode.

[0053] In a specific implementation, when the user needs to charge the electric vehicle, the charging mode can be triggered through the mode switching button. The switching switch 200 is in the charging mode, and its switching device is disconnected, so that the connection of each inductance of the motor stator winding 300 is disconnected, thereby disconnecting the connection between the motor controller 100 and the motor stator winding 300. The motor controller 100 cannot provide alternating voltage to the motor stator winding 300 to drive the electric vehicle to travel. At this time, the motor controller 100 can maintain a connection with each inductance in the motor stator winding 300.

[0054] The motor controller 100 is used to convert alternating current from each stator winding 300 into direct current when the connection between each stator winding 300 is disconnected. The alternating current is provided by the external AC power supply 400.

[0055] The motor controller 100 is also used to output the direct current to the battery pack BT to charge the battery pack BT.

[0056] In FIG. 1, the external AC power supply 400 is a three-phase AC power supply.

[0057] In a specific implementation, in the charging mode, the motor stator winding 300 can be led to the shell, and the external AC power supply 400 from the power grid can be externally connected, so that the motor stator winding 300 is connected with the external AC power supply 400.

[0058] As shown in FIG. 1, in the charging mode, the first end of the first inductance L1 is also used to connect the C phase of the external AC power supply 400, the first end of the second inductance L2 is also used to connect the B phase of the external AC power supply 400, and the first end of the third inductance L3 is also used to connect the A phase of the external AC power supply.

[0059] In the charging mode, the first inductance L1, the second inductance L2 and the third inductance L3 in the motor stator winding 300 can receive three-phase alternating current output by the external alternating current power supply 400 as energy storage filter inductance, filter the three-phase alternating current, and output the filtered alternating current to the motor controller 100. The motor controller 100 can act as a rectifier, receive the filtered alternating current, rectify the filtered alternating current, convert the filtered alternating current into high-voltage direct current that can be received by the battery pack BT, and output the high-voltage direct current to the battery pack BT to charge the battery pack BT.

[0060] In this embodiment, the stator winding 300 is used to filter the alternating current output by the external alternating current power supply 400 in the charging mode and output the filtered alternating current to the motor controller 100.

[0061] The motor controller 100 is also used to rectify the filtered alternating current to obtain the direct current.

[0062] As shown in FIG. 1, in the charging mode, the first switch S1 and the second switch S2 are disconnected, at this time, the first inductance L1, the second inductance L2 and the third inductance L3 can act as energy storage filter inductance to filter the three-phase alternating current output by the external alternating current power supply 400, obtain the filtered alternating current, and output the filtered alternating current to the motor controller 100.

[0063] The above charging mode reuses the motor controller 100 in the driving mode, and the driving mode and the charging mode are switched by the switching switch 200. Since the motor controller 100 can realize rectification in the charging mode, no additional devices are needed, and no additional rectification circuit needs to be set when the vehicle-mounted charger or the direct-current charging pile is connected, thereby eliminating the dependence on the vehicle-mounted charger or the direct-current charging pile and saving internal space.

[0064] The electric vehicle charging circuit in this embodiment includes a motor controller, a switching switch and a motor. One side of the motor controller is connected with a battery pack, and the other side of the motor controller is connected with each stator winding of the motor respectively. Each stator winding is connected through the switching switch, and each stator winding is also used to connect an external alternating current power supply. In the charging mode, the switching switch disconnects the connection between each stator winding. When the connection between each stator winding is disconnected, the motor controller converts alternating current from each stator winding into direct current, and the alternating current is provided by an external alternating current power supply. The motor controller outputs the direct current to the battery pack to charge the battery pack. In the charging mode, the above circuit converts alternating current from an external power supply into direct current through the motor controller, thereby realizing the reuse of the electric circuit containing the motor controller to charge the battery pack, without the need to additionally set a corresponding circuit in additional equipment such as a vehicle-mounted charger or a charging pile, thereby effectively reducing the cost of using the vehicle.

[0065] Based on the first embodiment, the second embodiment of the electric vehicle charging circuit is provided.

[0066] In the embodiment, the motor controller 100 is further configured to, in the driving mode, invert the direct current input by the battery pack BT into three-phase alternating current with adjustable frequency and output the three-phase alternating current to each of the motor stator windings 300.

[0067] In a specific implementation, in the driving mode, the first inductor L1, the second inductor L2 and the third inductor L3 are not connected to the external alternating current power supply 400, in this mode, the first switch S1 and the second switch S2 are both closed, thereby turning on the driving loop composed of the battery pack BT, the motor controller 100, the first inductor L1, the second inductor L2 and the third inductor L3, and connecting the motor controller 100 to the first inductor L1, the second inductor L2 and the third inductor L3. The motor controller 100 can invert the direct current input by the battery pack BT into three-phase alternating current with adjustable frequency, and then output the three-phase alternating voltage to the first inductor L1, the second inductor L2 and the third inductor L3, respectively.

[0068] For the convenience of understanding, the second embodiment of the electric vehicle charging circuit is described with reference to FIG. 2, but the present application is not limited thereto. FIG. 2 is a circuit schematic diagram of the second embodiment of the electric vehicle charging circuit in the driving mode, in which the motor controller 100 includes a first IGBT Q1, a second IGBT Q2, a third IGBT Q3, a fourth IGBT Q4, a fifth IGBT Q5 and a sixth IGBT Q6.

[0069] The collector of the first IGBT Q1, the collector of the second IGBT Q2 and the collector of the third IGBT Q3 are connected to the positive electrode of the battery pack BT; the emitter of the first IGBT Q1 is connected to the collector of the fourth IGBT Q4 and the second end of the first inductor L1, respectively; the emitter of the second IGBT Q2 is connected to the collector of the fifth IGBT Q5, the second end of the first inductor L1 and the second end of the second inductor L2, respectively; the emitter of the third IGBT Q3 is connected to the collector of the sixth IGBT Q6, the second end of the first inductor L1 and the second end of the third inductor L3, respectively; the emitter of the fourth IGBT Q4, the emitter of the fifth IGBT Q5 and the emitter of the sixth IGBT Q6 are connected to the negative electrode of the battery pack BT.

[0070] The gate electrodes of the first IGBT Q1, the second IGBT Q2, the third IGBT Q3, the fourth IGBT Q4, the fifth IGBT Q5 and the sixth IGBT Q6 are connected with a controller mainboard. The controller mainboard can output corresponding PWM signals to control the conduction of the first IGBT Q1, the second IGBT Q2, the third IGBT Q3, the fourth IGBT Q4, the fifth IGBT Q5 and the sixth IGBT Q6, so that the first IGBT Q1, the second IGBT Q2, the third IGBT Q3, the fourth IGBT Q4, the fifth IGBT Q5 and the sixth IGBT Q6 invert the battery voltage output by the battery pack BT into a frequency-adjustable three-phase alternating voltage, and output the three-phase alternating voltage obtained by inversion to the first inductor L1, the second inductor L2 and the third inductor L3 through the first IGBT Q1, the second IGBT Q2, the third IGBT Q3, the fourth IGBT Q4, the fifth IGBT Q5 and the sixth IGBT Q6.

[0071] The motor stator winding 300 is configured to generate a rotating magnetic field based on the received three-phase alternating voltage, so that the rotor of the motor drives the electric vehicle to move by following the rotating magnetic field.

[0072] In a specific implementation, after the first inductor L1, the second inductor L2 and the third inductor L3 receive the three-phase alternating voltage, a rotating magnetic field can be generated on the motor stator, and the rotating magnetic field and the magnetic field generated by the motor rotor can drive the electric vehicle to move.

[0073] Since the motor controller 100 obtains a pulse current with a high effective value or peak value from the battery pack BT, a high pulse voltage is generated on the direct-current support, which damages the motor controller 100. Therefore, the bus capacitor Cap needs to be selected for connection. In the driving mode, the bus capacitor Cap can smooth the bus voltage, so that the bus voltage of the motor controller 100 remains smooth during the switching of the IGBTs, reduces the inductance parameter of the line from the motor controller 100 to the battery pack BT, weakens the peak voltage of the bus, absorbs the high pulse current at the bus end of the motor controller 100, prevents overcharging of the bus end voltage, and prevents the influence of the instantaneous voltage on the motor controller 100.

[0074] In this embodiment, the motor is an electrically excited synchronous motor.

[0075] The drive motor of the current electric vehicle includes a permanent magnet synchronous motor and an alternating current asynchronous motor. The permanent magnet synchronous motor adopts permanent magnet excitation, which performs very well at low speed and high torque, and has high efficiency. However, the high speed performance is limited due to the large stator current cost for field weakening, and the efficiency is low. In addition, under high temperature conditions, the permanent magnet has the risk of demagnetization and stall. The excitation of the alternating current asynchronous motor comes from the stator, which has excellent high speed performance and high efficiency. However, at low speed and high torque, the stator not only needs to provide strong torque current but also needs to provide excitation current, so the efficiency is low and the performance is poor at low speed.

[0076] The motor used in the electric vehicle of the embodiment adopts an electrically excited synchronous motor, the excitation of which is provided by the rotor winding, and the excitation is adjustable, so that appropriate excitation can be provided according to the operating condition whether at low speed or at high speed, and the high speed and low speed performance is better than that of the permanent magnet synchronous motor and the alternating current asynchronous motor.

[0077] In the embodiment, the rotor is provided with an excitation winding.

[0078] The excitation winding is connected with an external DC power supply.

[0079] The excitation winding is used to output external DC power from the external DC power supply to the rotor to form a rotor magnetic field on the rotor.

[0080] In the driving mode, the excitation winding on the rotor is connected with the external DC power supply, the external DC power provided by the external DC power supply is output to the rotor through the excitation winding, and the rotor can generate a rotor magnetic field based on the external DC power.

[0081] The rotor is also used to rotate synchronously with the rotating magnetic field through the rotor magnetic field to drive the motor shaft to rotate, so that the rotating torque generated by the rotation of the motor shaft drives the electric vehicle to run through the transmission system.

[0082] In a specific implementation, the above rotor magnetic field interacts with the rotating magnetic field of the stator, so that the rotor rotates synchronously with the rotating magnetic field formed by the stator, the rotation of the rotor drives the motor shaft to rotate, and the rotating torque generated by the rotation of the motor shaft can be transmitted to the wheels through the transmission system to drive the electric vehicle to run.

[0083] In addition, as shown in FIG. 3, which is a circuit schematic diagram of the electric vehicle charging circuit in the second embodiment of the application in the charging mode. In the charging mode, the first IGBT Q1, the second IGBT Q2, the third IGBT Q3, the fourth IGBT Q4, the fifth IGBT Q5 and the sixth IGBT Q6 in the motor controller 100 can act as rectifiers in the charging mode, and each IGBT can convert the filtered alternating current output by the first inductor L1, the second inductor L2 and the third inductor L3 into high-voltage direct current according to the instruction of the controller mainboard, and output the high-voltage direct current to the battery pack BT, so as to accurately realize the multiplexing of the motor controller 100 to charge the battery pack BT.

[0084] In the embodiment, the field winding is disconnected from the external DC power supply in the charging mode.

[0085] In the charging mode, the field winding on the rotor can be disconnected from the external DC power supply, so that no magnetic field is formed on the rotor, thereby keeping the motor stationary during the entire charging process and improving the comprehensive performance of noise, vibration and harshness (NVH).

[0086] In addition, the embodiment of the application further provides an electric vehicle charging device, which comprises the electric vehicle charging circuit described above.

[0087] In this document, the terms "comprises", "comprising", or any other variation thereof are intended to cover a non-exclusive inclusion, so that a process, method, article or system that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, method, article or system. Without more limitations, an element defined by the statement "comprises a" does not exclude the existence of additional identical elements in the process, method, article or system that includes the element.

[0088] The serial numbers of the above embodiments of the application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0089] The above is only an optional embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation based on the content of the specification and drawings of the application, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. An electric vehicle charging circuit, wherein, The circuit comprises a motor controller, a battery pack, a switching switch and a motor; One side of the motor controller is connected with the battery pack, and the other side of the motor controller is connected with each stator winding of the motor respectively, each stator winding is connected through the switching switch, and each stator winding is also used for connecting an external AC power supply; The switching switch is used for disconnecting the connection between each stator winding in a charging mode; The motor controller is used for converting AC power from each stator winding into DC power when the connection between each stator winding is disconnected, and the AC power is provided by the external AC power supply; The motor controller is also used for outputting the DC power to the battery pack to charge the battery pack.

2. The electric vehicle charging circuit of claim 1, wherein, The stator winding is used for filtering AC power output by the external AC power supply and outputting the filtered AC power to the motor controller in the charging mode; The motor controller is also used for rectifying the filtered AC power to obtain the DC power.

3. The electric vehicle charging circuit of claim 1, wherein, The motor controller is also used for inverting the DC power input by the battery pack into frequency-adjustable three-phase AC power and outputting the three-phase AC power to each stator winding in a driving mode; The stator winding is used for generating a rotating magnetic field based on the received three-phase AC voltage to drive the electric vehicle to run through synchronous rotation of the rotor following the rotating magnetic field.

4. The electric vehicle charging circuit of claim 3, wherein, The rotor is provided with an excitation winding; The excitation winding is connected with an external DC power supply; The excitation winding is used for outputting external DC power from the external DC power supply to the rotor to form a rotor magnetic field on the rotor; The rotor is used for rotating synchronously with the rotating magnetic field through the rotor magnetic field to drive the motor shaft to rotate, so that the rotating torque generated by the rotation of the motor shaft drives the electric vehicle to run through a transmission system.

5. The electric vehicle charging circuit of claim 4, wherein, The excitation winding is disconnected with the external DC power supply in the charging mode.

6. The electric vehicle charging circuit of any one of claims 1 to 5, wherein, Each stator winding comprises a first inductor, a second inductor and a third inductor; The switching switch comprises a first switch and a second switch; The first end of the first switch is connected with the first end of the first inductor, the second end of the first switch is connected with the first end of the second inductor and the first end of the second switch respectively, and the second end of the second switch is connected with the first end of the third inductor; The second end of the first inductor, the second end of the second inductor and the second end of the third inductor are connected with the motor controller.

7. The electric vehicle charging circuit of claim 6, wherein, The circuit further comprises a bus capacitor; The motor controller comprises a first IGBT, a second IGBT, a third IGBT, a fourth IGBT, a fifth IGBT and a sixth IGBT; The collector of the first IGBT, the collector of the second IGBT and the collector of the third IGBT are connected with the positive electrode of the battery pack; The emitter of the first IGBT is connected with the collector of the fourth IGBT and the second end of the first inductor respectively, the emitter of the second IGBT is connected with the collector of the fifth IGBT, the second end of the first inductor and the second end of the second inductor respectively, and the emitter of the third IGBT is connected with the collector of the sixth IGBT, the second end of the first inductor and the second end of the third inductor respectively; The emitter of the fourth IGBT, the emitter of the fifth IGBT and the emitter of the sixth IGBT are connected with the negative electrode of the battery pack; The first end of the bus capacitor is connected with the positive electrode of the battery pack, and the second end of the bus capacitor is connected with the negative electrode of the battery pack.

8. The electric vehicle charging circuit of claim 7, wherein, The external AC power supply is a three-phase AC power supply; In the charging mode, the first end of the first inductor is also used for connecting the C phase of the external AC power supply, the first end of the second inductor is also used for connecting the B phase of the external AC power supply, and the first end of the third inductor is also used for connecting the A phase of the external AC power supply.

9. The electric vehicle charging circuit of claim 2, wherein, The motor is an electrically excited synchronous motor.

10. An electric vehicle charging device, wherein, The device comprises the electric vehicle charging circuit as claimed in any one of claims 1 to 9.

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