Charging circuit and vehicle

Abstract

A vehicle, comprising a charging circuit; the charging circuit comprises a power battery, a charging interface, and at least one inductor, where the power battery, the at least one inductor, and the charging interface are sequentially connected; the charging interface is used for connecting to a charging connector capacitor; and the power battery is adapted for implementing pre-charging on the charging connector capacitor by means of the at least one inductor.

Description

Charging circuit and vehicle

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on November 30, 2023, with application number 202311637460.0 and titled “Charging Circuit and Vehicle,” the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0003] The present disclosure relates to the technical field of battery charging, and in particular, to a charging circuit and a vehicle. Background Art

[0004] In related technologies, when charging a vehicle with a charging gun, if the charging gun is directly connected to the vehicle for charging, factors such as voltage shock or current peak when the current starts may cause overload and damage to circuit components (for example, power batteries). Summary of the Invention

[0005] The purpose of the present disclosure is to provide a charging circuit and a vehicle to solve the problems in the related art.

[0006] To achieve the above objectives, a first aspect of an embodiment of the present disclosure provides a charging circuit, the charging circuit comprising a power battery, a charging interface, and at least one inductor, wherein the power battery, the at least one inductor, and the charging interface are connected in sequence;

[0007] The charging interface is used to connect the charging gun capacitor;

[0008] The power battery is suitable for pre-charging the charging gun capacitor through the at least one inductor.

[0009] Optionally, the charging circuit further includes at least one switching unit, the power battery, the at least one inductor, the at least one switching unit and the charging interface are connected in sequence, and the power battery is suitable for pre-charging the charging gun capacitor through the at least one inductor and the at least one switching unit.

[0010] Optionally, the at least one switching unit includes N-phase bridge arms, and the at least one inductor includes N-phase windings corresponding one-to-one to the N-phase bridge arms, wherein each phase winding is connected to a midpoint of a corresponding bridge arm, and N≥1;

[0011] The positive electrode of the power battery is connected to the first bus terminal of the N-phase bridge arm, the first bus terminal is connected to the charging port, and the negative electrode of the power battery is connected to the second bus terminal of the N-phase bridge arm;

[0012] The charging port is also connected to the midpoint of any one of the bridge arms.

[0013] Optionally, the charging interface includes a positive electrode interface and a negative electrode interface;

[0014] The positive electrode interface is connected to the first bus terminal, and the positive electrode interface is used to connect to the first end of the charging gun capacitor;

[0015] The negative electrode interface is connected to the midpoint of any of the bridge arms, and the negative electrode interface is used to connect to the second end of the charging gun capacitor. Optionally, the charging circuit further includes:

[0016] A controller connected to the N-phase bridge arm;

[0017] The controller is configured to control the N-phase bridge arm so that the power battery charges the charging gun capacitor by reducing the voltage through the N-phase winding and the N-phase bridge arm.

[0018] Optionally, the N-phase bridge arm is a three-phase bridge arm, and the N-phase winding is a three-phase winding;

[0019] The controller is configured to control the three-phase bridge arm to cycle in a first state, a second state, a third state, and a fourth state in sequence, so that the power battery reduces the voltage to charge the charging gun capacitor:

[0020] Among them, in the first state, the upper bridge arms in the three-phase bridge arms are all disconnected, the lower bridge arm in the bridge arm connected to the negative electrode interface is disconnected, one of the lower bridge arms in the bridge arm not connected to the negative electrode interface is turned on, and the other lower bridge arm in the bridge arm not connected to the negative electrode interface is disconnected;

[0021] In the second state, the upper bridge arms in the three-phase bridge arms are all disconnected, and the lower bridge arms in the three-phase bridge arms are all disconnected;

[0022] In the third state, the upper bridge arms in the three-phase bridge arms are all disconnected, the lower bridge arms in the bridge arms connected to the negative electrode interface are disconnected, and the lower bridge arms in the bridge arms not connected to the negative electrode interface are all connected;

[0023] In the fourth state, the upper bridge arms of the three-phase bridge arms are all disconnected, and the lower bridge arms of the three-phase bridge arms are all disconnected.

[0024] Optionally, the controller is configured to:

[0025] Control any one lower bridge arm of the N-phase bridge arms to be turned on, so that the charging gun charges the power battery.

[0026] Optionally, the charging circuit further includes:

[0027] A bus capacitor, one end of the bus capacitor is connected to the first bus terminal of the N-phase bridge arm, and a second end of the bus capacitor is connected to the second bus terminal of the N-phase bridge arm.

[0028] Optionally, the charging circuit further includes:

[0029] A switch, wherein the power battery is connected to the charging interface via the switch.

[0030] Optionally, the charging circuit further includes: a controller,

[0031] The controller is configured to: when the switch is sintered, control the battery cover driving device to drive the battery cover to cover the charging port. Optionally, the N-phase winding reuses the multi-phase coils of the motor, and the N-phase bridge arm reuses the multi-phase bridge arm of the motor controller.

[0032] Optionally, the motor includes a drive motor or an air-conditioning compressor, and the motor controller includes a motor controller corresponding to the drive motor, or a motor controller corresponding to the air-conditioning compressor.

[0033] According to a second aspect of the disclosed embodiment, a vehicle is also provided, comprising the charging circuit provided by any one of the first aspects of the disclosed embodiments.

[0034] The above technical solution comprises a charging circuit comprising a power battery, a charging interface, and at least one inductor, which are sequentially connected. The charging interface is used to connect to the charging gun capacitor, and the power battery precharges the charging gun capacitor via the at least one inductor. Precharging the charging gun capacitor to provide an initial voltage reduces voltage surges and current peaks during charging startup, preventing overload and damage to circuit components, thereby improving the reliability and lifespan of the charging circuit.

[0035] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings:

[0037] FIG1 is a block diagram of a vehicle provided by an embodiment of the present disclosure.

[0038] FIG2 is a circuit diagram of a charging circuit provided by an embodiment of the present disclosure.

[0039] FIG3 is a circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0040] FIG4 is a circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0041] FIG5 is a circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0042] FIG6 is a circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0043] FIG7 is a circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0044] FIG8 is a circuit diagram of another charging circuit provided in an embodiment of the present disclosure.

[0045] Explanation of the accompanying symbols: 10-vehicle; 20-charging circuit; 11-power battery; 12-N-phase bridge arm; 121-first bridge arm; 122-second bridge arm; 123-third bridge arm; 13-N-phase winding; 14-positive electrode interface; 15-negative electrode interface; 16-inductor; 17-charging interface; 18-switch unit; 30-battery cover; T1-first switch tube; T2-second switch tube; T3-third switch tube; T4-fourth switch tube; T5-fifth switch tube; T6-sixth switch tube; K1-switch; C1-charging gun capacitor; C2-bus capacitor. DETAILED DESCRIPTION

[0046] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0047] The terms "first", "second", etc. used in this disclosure are intended to distinguish one element from another and do not have order or importance. In addition, in the following description, when referring to the drawings, unless otherwise explained, the same reference numerals in different drawings represent the same or similar elements.

[0048] With the continuous development of vehicle technology and the popularization of electric vehicles, DC fast charging technology for electric vehicles is becoming more and more common.

[0049] In related technologies, when charging a vehicle with a charging gun, if the charging gun is directly connected to the vehicle for charging, factors such as voltage shock or current peak when the current starts may cause overload and damage to circuit components (for example, power batteries).

[0050] To address the aforementioned technical issues, a charging circuit includes a power battery, a charging interface, and at least one inductor. The power battery, the at least one inductor, and the charging interface are connected in sequence. The charging interface is used to connect to the charging gun capacitor. The power battery precharges the charging gun capacitor via the at least one inductor. Precharging the charging gun capacitor to provide an initial voltage reduces voltage surges and current peaks during charging startup, preventing overload and damage to circuit components, thereby improving the reliability and lifespan of the charging circuit.

[0051] As shown in FIG1 , the charging circuit includes a power battery 11 , a charging interface 17 , and at least one inductor 16 . The power battery 11 , the at least one inductor 16 , and the charging interface 17 are connected in sequence.

[0052] Charging port 17 is used to connect the charging gun capacitor;

[0053] The power battery 11 is suitable for pre-charging the charging gun capacitor through at least one inductor 16 .

[0054] Precharging the charging gun capacitor to provide an initial voltage to the charging gun capacitor can reduce the voltage shock and current peak when charging starts, avoid overload and damage to circuit components, and thus improve the reliability and life of the charging circuit 20.

[0055] Compared with pre-charging with a pre-charging resistor, during the pre-charging process of the inductor, a self-inductance voltage will be generated when the current changes, which can offset the power supply voltage, thereby reducing the current during pre-charging. The generation of self-inductance voltage can also help reduce energy loss during pre-charging, and due to the characteristics of the inductor, it can achieve more efficient energy transmission.

[0056] In one possible embodiment, the charging circuit further includes at least one switching unit 18, the power battery 11, at least one inductor 16, at least one switching unit 18 and the charging interface 17 are connected in sequence, and the power battery 11 is suitable for pre-charging the charging gun capacitor through at least one inductor 16 and at least one switching unit 18.

[0057] By setting the switch unit 18, the start and stop of pre-charging can be controlled.

[0058] For example, the number of switch units 18 and the number of inductors 16 may be equal, and the switch units 18 and the inductors 16 may be connected in a one-to-one correspondence.

[0059] In one possible implementation, please refer to FIG2 , which is a circuit diagram of a charging circuit 20 provided in an embodiment of the present disclosure. As shown in FIG2 , at least one switch unit 18 includes N-phase bridge arms 12, and at least one inductor 16 includes N-phase windings 13 corresponding one-to-one with the N-phase bridge arms 12, wherein each phase winding is connected to the midpoint of the corresponding bridge arm, N ≥ 1, where N is a positive integer;

[0060] The positive electrode of the power battery 11 is connected to the first bus terminal of the N-phase bridge arm 12, which is connected to the charging interface 17, and the negative electrode of the power battery 11 is connected to the second bus terminal of the N-phase bridge arm 12;

[0061] The charging port 17 is also connected to the midpoint of any bridge arm.

[0062] In one possible implementation, the charging interface 17 includes a positive electrode interface 14 and a negative electrode interface 15;

[0063] The positive electrode interface 14 is connected to the first bus terminal, and the positive electrode interface 14 is used to connect to the first end of the charging gun capacitor C1;

[0064] The negative electrode interface 15 is connected to the midpoint of any bridge arm, and the negative electrode interface 15 is used to connect to the second end of the charging gun capacitor C1.

[0065] In one possible embodiment, the charging circuit 20 includes: a power battery 11, a positive electrode interface 14, a negative electrode interface 15, an N-phase bridge arm 12, and an N-phase winding 13 corresponding to the N-phase bridge arm 12, wherein each phase winding is connected to the midpoint of the corresponding bridge arm;

[0066] The positive electrode of the power battery 11 is connected to the first bus terminal of the N-phase bridge arm 12, the first bus terminal is connected to the positive electrode interface 14, and the negative electrode of the power battery 11 is connected to the second bus terminal of the N-phase bridge arm 12;

[0067] The positive electrode interface 14 is used to connect to the first end of the charging gun capacitor C1;

[0068] The negative electrode interface 15 is connected to the midpoint of any bridge arm, and the negative electrode interface 15 is used to connect to the second end of the charging gun capacitor C1.

[0069] The positive electrode interface 14 and the negative electrode interface 15 are used to connect to the charging gun to realize the input or output of electric energy.

[0070] Before the charging gun charges the power battery 11 , the power battery 11 needs to discharge to pre-charge the charging gun capacitor C1 .

[0071] The first end of each phase winding is connected to the midpoint of the corresponding bridge arm, the second end of each phase winding is connected together to form the neutral point of the N-phase winding 13, and the negative electrode interface 15 is connected to the first end of any phase winding.

[0072] Through the above technical solution, the charging circuit 20 includes a power battery 11, a positive electrode interface 14, a negative electrode interface 15, an N-phase bridge arm 12, and an N-phase winding 13 corresponding to each N-phase bridge arm 12, wherein each phase winding is connected to the midpoint of the corresponding bridge arm; the positive electrode of the power battery 11 is connected to the first bus terminal of the N-phase bridge arm 12, which is connected to the positive electrode interface 14, and the negative electrode of the power battery 11 is connected to the second bus terminal of the N-phase bridge arm 12; the positive electrode interface 14 is used to connect to the first end of the charging gun capacitor C1; the negative electrode interface 15 is connected to the midpoint of any bridge arm, and the negative electrode interface 15 is used to connect to the second end of the charging gun capacitor C1. By using any bridge arm in the N-phase bridge arm 12 as a switch at the interface, since there are multiple bridge arms in the N-phase bridge arm 12, each time a bridge arm is turned on during charging, the multiple bridge arms accumulate charging times together, sharing the risk of sintering, thereby reducing the occurrence of sintering.

[0073] In a possible implementation, the charging circuit 20 further includes:

[0074] The controller is connected to the N-phase bridge arm 12 ; the controller may be a microcontroller unit (MCU).

[0075] The controller is configured to control the N-phase bridge arm 12 so that the power battery 11 charges the charging gun capacitor C1 by reducing the voltage through the N-phase winding 13 and the N-phase bridge arm 12 .

[0076] When there is a large capacitor in the charging pile, the charging gun capacitor C1 is pre-charged after the charging port is connected to the charging pile, generating a pre-charge current, which may cause the switching device to sinter.

[0077] During the pre-charging process, the charging gun capacitor C1, the N-phase winding 13, and the N-phase bridge arm 12 form a step-down circuit. The power battery 11 is stepped down by the step-down circuit, and the charging gun capacitor C1 is charged during the step-down process. The controller controls the high-frequency switching of the conduction state of the lower bridge arm in the N-phase bridge arm 12 in turn, and disconnects it before the pre-charging current increases sharply to reach a dangerous value, thereby charging the charging gun capacitor C1 with a smaller current and a higher frequency until it is fully charged.

[0078] In a possible implementation, referring to FIG. 3 and FIG. 4 , the N-phase bridge arm 12 is a three-phase bridge arm, and the N-phase winding 13 is a three-phase winding.

[0079] The controller is configured to control the three-phase bridge arm to cycle in the first state, the second state, the third state and the fourth state in sequence, so that the power battery 11 reduces the voltage to charge the charging gun capacitor C1:

[0080] Among them, in the first state, the upper bridge arms in the three-phase bridge arms are all disconnected, the lower bridge arm in the bridge arm connected to the negative electrode interface 15 is disconnected, one of the lower bridge arms in the bridge arm not connected to the negative electrode interface 15 is connected, and the other lower bridge arm in the bridge arm not connected to the negative electrode interface 15 is disconnected;

[0081] In the second state, the upper bridge arms in the three-phase bridge arms are all disconnected, and the lower bridge arms in the three-phase bridge arms are all disconnected;

[0082] In the third state, the upper bridge arms of the three-phase bridge arms are all disconnected, the lower bridge arms of the bridge arms connected to the negative electrode interface 15 are disconnected, and the lower bridge arms of the bridge arms not connected to the negative electrode interface 15 are all connected;

[0083] In the fourth state, the upper bridge arms in the three-phase bridge arms are all disconnected, and the lower bridge arms in the three-phase bridge arms are all disconnected.

[0084] For example, referring to Figures 3 and 4, N-phase bridge arm 12 is a three-phase bridge arm, specifically including a first bridge arm 121, a second bridge arm 122, and a third bridge arm 123. N-phase winding 13 is a three-phase winding, specifically including a first phase winding, a second phase winding, and a third phase winding. First bridge arm 121 is connected to the first phase winding, second bridge arm 122 is connected to the second phase winding, and third bridge arm 123 is connected to the third phase winding. Negative terminal 15 is connected to the midpoint of third bridge arm 123, that is, negative terminal 15 is connected to the first end of the third phase winding.

[0085] The first bridge arm 121 includes a first switching transistor T1 and a second switching transistor T2. The second bridge arm 122 includes a third switching transistor T3 and a fourth switching transistor T4. The third bridge arm 123 includes a fifth switching transistor T5 and a sixth switching transistor T6. The first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5 form the upper bridge arm of the N-phase bridge arm 12, while the second switching transistor T2, the fourth switching transistor T4, and the sixth switching transistor T6 form the lower bridge arm of the N-phase bridge arm 12.

[0086] The drains of the first, third, and fifth switching transistors T1, T3, and T5 are all connected to the first bus terminal, and the sources of the second, fourth, and sixth switching transistors T2, T4, and T6 are all connected to the second bus terminal. The source of the first switching transistor T1 is connected to the drain of the second switching transistor T2, and the source of the first switching transistor T1 and the drain of the second switching transistor T2 are connected to the first phase winding; the source of the third switching transistor T3 is connected to the drain of the fourth switching transistor T4, and the source of the third switching transistor T3 and the drain of the fourth switching transistor T4 are connected to the second phase winding; the source of the fifth switching transistor T5 is connected to the drain of the sixth switching transistor T6, and the source of the fifth switching transistor T5 and the drain of the sixth switching transistor T6 are connected to the third phase winding.

[0087] In the first state, referring to FIG3 , the upper bridge arms of the three-phase bridge arms are the first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5. The lower bridge arm of the bridge arm connected to the negative electrode interface 15 is the sixth switching transistor T6. One of the lower bridge arms of the bridge arm not connected to the negative electrode interface 15 can be, for example, the fourth switching transistor T4. The other lower bridge arm of the bridge arm not connected to the negative electrode interface 15 is the fifth switching transistor T5. That is, in the first state, the first switching transistor T1, the second switching transistor T2, the third switching transistor T3, the fifth switching transistor T5, and the sixth switching transistor T6 are all off, and the fourth switching transistor T4 is on.

[0088] In the second state, the first switch tube T1 , the second switch tube T2 , the third switch tube T3 , the fourth switch tube T4 , the fifth switch tube T5 and the sixth switch tube T6 are all turned off.

[0089] In the third state, referring to FIG4 , the upper bridge arms of the three-phase bridge arms are the first switching transistor T1, the third switching transistor T3, and the fifth switching transistor T5. The lower bridge arm of the bridge arm connected to the negative electrode interface 15 is the sixth switching transistor T6. The lower bridge arm of the bridge arm not connected to the negative electrode interface 15 is the second switching transistor T2 and the fourth switching transistor T4. That is, in the second state, the first switching transistor T1, the third switching transistor T3, the fifth switching transistor T5, and the sixth switching transistor T6 are all off, while the second switching transistor T2 and the fourth switching transistor T4 are on.

[0090] In the fourth state, the first switch tube T1 , the second switch tube T2 , the third switch tube T3 , the fourth switch tube T4 , the fifth switch tube T5 and the sixth switch tube T6 are all turned off.

[0091] The switching tube may be a thyristor.

[0092] In the first state, the pre-charge current flows out from the positive electrode of the power battery 11, charges the charging gun capacitor C1, and then returns to the negative electrode of the power battery 11 through the second phase winding and the fourth switch tube T4. After a very short time, the fourth switch tube T4 is disconnected before the pre-charge current increases sharply, that is, the second state. In the third state, the pre-charge current flows out from the positive electrode of the power battery 11, charges the charging gun capacitor C1, and then returns to the negative electrode of the power battery 11 through the second phase winding and the fourth switch tube T4, the first phase winding and the second switch tube T2. After a very short time, the second switch tube T2 and the fourth switch tube T4 are disconnected before the pre-charge current increases sharply, that is, the fourth state. It then returns to the first state and continues the cycle, chopping the originally sharply increased pre-charge current into a gently increased pre-charge current through the high-frequency switching of the thyristor, reducing the risk of sintering of the switching device during the pre-charge process.

[0093] In a possible implementation, the charging circuit 20 further includes:

[0094] Switch K1 : The power battery 11 is connected to the charging interface 17 via the switch K1 .

[0095] For example, the first bus terminal is connected to the positive electrode interface 14 via the switch K1 .

[0096] By way of example, the switch K1 may include a relay.

[0097] In other embodiments, the controller may also be connected to the switch K1 to control the on / off state of the switch K1.

[0098] In a possible implementation, after the pre-charging is completed, the charging gun performs DC charging on the power battery 11, and the controller is configured to:

[0099] Any lower bridge arm in the N-phase bridge arm 12 is controlled to be turned on, so that the charging gun charges the power battery 11 .

[0100] Please refer to Figure 5. Any lower bridge arm in the N-phase bridge arm 12 is the sixth switch tube T6. The controller controls the sixth switch tube T6 to be turned on, and the other switch tubes are turned off. The switch K1 is also controlled to be turned on. The power of the charging gun passes through the positive electrode interface 14, the switch K1, the power battery 11, the sixth switch tube T6, and the negative electrode interface 15 in sequence and returns to the charging gun, forming a charging circuit for the charging gun to charge the power battery 11.

[0101] Please refer to Figure 6. Any lower bridge arm in the N-phase bridge arm 12 is the fourth switch tube T4. The controller controls the fourth switch tube T4 to be turned on, the other switch tubes to be turned off, and controls the switch K1 to be turned on. The electric energy of the charging gun passes through the positive electrode interface 14, switch K1, power battery 11, fourth switch tube T4, second phase winding, third phase winding, negative electrode interface 15 in sequence and returns to the charging gun, forming a charging circuit for the charging gun to charge the power battery 11.

[0102] Please refer to Figure 7. Any lower bridge arm in the N-phase bridge arm 12 is the second switch tube T2. The controller controls the second switch tube T2 to be turned on, the other switch tubes to be turned off, and controls the switch K1 to be turned on. The electric energy of the charging gun passes through the positive electrode interface 14, switch K1, power battery 11, second switch tube T2, first phase winding, third phase winding, negative electrode interface 15 in sequence and returns to the charging gun, forming a charging circuit for the charging gun to charge the power battery 11.

[0103] When the charging gun is charging the power battery 11 , it can switch between the three states mentioned above. The second switch tube T2 , the fourth switch tube T4 and the sixth switch tube T6 take turns to bear the charging current, thereby extending the service life of the charging circuit 20 .

[0104] In a possible implementation, the charging circuit 20 further includes:

[0105] The bus capacitor C2 has one end connected to the first bus terminal of the N-phase bridge arm 12 , and a second end connected to the second bus terminal of the N-phase bridge arm 12 .

[0106] In a possible embodiment, referring to FIG8 , in order to further avoid the risk of sintering in the switch K1 or the N-phase bridge arm 12 , the charging circuit 20 further includes:

[0107] Controller;

[0108] The controller is configured to, when the switch K1 is sintered, control the battery cover driving device to drive the battery cover 30 to cover the charging interface 17 , that is, the positive electrode interface 14 and the negative electrode interface 15 .

[0109] When the switch K1 or the N-phase bridge arm 12 is sintered, the controller controls the battery cover driving device to drive the battery cover 30 to cover the positive electrode interface 14 and the negative electrode interface 15, or even sounds an alarm.

[0110] In a possible implementation, the N-phase windings reuse the multi-phase coils of the motor, and the N-phase bridge arms reuse the N-phase bridge arms of the motor controller.

[0111] Specifically, the motor includes a drive motor or an air-conditioning compressor, and the motor controller includes a motor controller corresponding to the drive motor or a motor controller corresponding to the air-conditioning compressor.

[0112] That is to say, the N-phase winding and the N-phase bridge arm in the charging circuit 20 can be shared with the existing motor and motor controller on the vehicle, without the need for additional ones, thus saving space and resources.

[0113] In other embodiments of the present disclosure, the N-phase bridge arm may also be an N-phase bridge arm in an inverter on a vehicle, and the N-phase winding may be an N-phase winding in a motor on the vehicle.

[0114] The embodiment of the present disclosure further provides a vehicle 10 , as shown in FIG1 . The vehicle includes the charging circuit 20 described above.

[0115] 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.

[0116] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0117] 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 circuit (20), characterized in that: The charging circuit (20) comprises a power battery (11), a charging interface (17) and at least one inductor (16), wherein the power battery (11), the at least one inductor (16) and the charging interface (17) are connected in sequence; The charging interface (17) is used to connect the charging gun capacitor (C1); The power battery (11) is suitable for precharging the charging gun capacitor (C1) through the at least one inductor (16).

2. The charging circuit (20) according to claim 1, characterized in that: The charging circuit (20) further comprises at least one switch unit (18); the power battery (11), the at least one inductor (16), the at least one switch unit (18) and the charging interface (17) are connected in sequence; the power battery (11) is suitable for precharging the charging gun capacitor (C1) through the at least one inductor (16) and the at least one switch unit (18).

3. The charging circuit (20) according to claim 2, characterized in that: The at least one switch unit (18) comprises N-phase bridge arms (12), and the at least one inductor (16) comprises N-phase windings (13) corresponding one-to-one to the N-phase bridge arms (12), wherein each phase winding is connected to the midpoint of the corresponding bridge arm, and N≥1; The positive electrode of the power battery (11) is connected to a first bus terminal of the N-phase bridge arm (12), the first bus terminal is connected to the charging interface (17), and the negative electrode of the power battery (11) is connected to a second bus terminal of the N-phase bridge arm (12); The charging interface (17) is also connected to the midpoint of any one of the bridge arms.

4. The charging circuit (20) according to claim 3, characterized in that: The charging interface (17) comprises a positive electrode interface (14) and a negative electrode interface (15); The positive electrode interface (14) is connected to the first bus terminal, and the positive electrode interface (14) is used to connect to the first end of the charging gun capacitor (C1); The negative electrode interface (15) is connected to the midpoint of any of the bridge arms, and the negative electrode interface (15) is used to connect to the second end of the charging gun capacitor (C1).

5. The charging circuit (20) according to claim 4, characterized in that: The charging circuit (20) further comprises: A controller connected to the N-phase bridge arm (12); The controller is configured to: control the N-phase bridge arm (12) so that the power battery (11) charges the charging gun capacitor (C1) by reducing the voltage through the N-phase winding (13) and the N-phase bridge arm (12).

6. The charging circuit (20) according to claim 5, characterized in that: The N-phase bridge arm (12) is a three-phase bridge arm, and the N-phase winding (13) is a three-phase winding; The controller is configured to control the three-phase bridge arm to be in a first state, a second state, a third state and a fourth state in sequence, so that the power battery (11) reduces the voltage to charge the charging gun capacitor (C1): Wherein, in the first state, the upper bridge arms in the three-phase bridge arms are all disconnected, the lower bridge arms in the bridge arms connected to the negative electrode interface (15) are disconnected, one of the lower bridge arms in the bridge arms not connected to the negative electrode interface (15) is turned on, and the other lower bridge arm in the bridge arms not connected to the negative electrode interface (15) is disconnected; In the second state, the upper bridge arms in the three-phase bridge arms are all disconnected, and the lower bridge arms in the three-phase bridge arms are all disconnected; In the third state, the upper bridge arms in the three-phase bridge arms are all disconnected, the lower bridge arms in the bridge arms connected to the negative electrode interface (15) are disconnected, and the lower bridge arms in the bridge arms not connected to the negative electrode interface (15) are all turned on; In the fourth state, the upper bridge arms in the three-phase bridge arms are all disconnected, and the lower bridge arms in the three-phase bridge arms are all disconnected.

7. The charging circuit (20) according to claim 5 or 6, characterized in that: The controller is configured to: Any one of the lower bridge arms of the N-phase bridge arms (12) is controlled to be turned on, so that the charging gun charges the power battery (11).

8. The charging circuit (20) according to any one of claims 3 to 7, characterized in that: The charging circuit (20) further comprises: A bus capacitor (C2), one end of the bus capacitor (C2) is connected to the first bus terminal of the N-phase bridge arm (12), and the second end of the bus capacitor (C2) is connected to the second bus terminal of the N-phase bridge arm (12).

9. The charging circuit (20) according to any one of claims 1 to 8, characterized in that: The charging circuit (20) further comprises: A switch (K1), wherein the power battery (11) is connected to the charging interface (17) via the switch (K1).

10. The charging circuit (20) according to claim 9, characterized in that: The charging circuit (20) further comprises: a controller, The controller is configured to: when the switch (K1) is sintered, control the battery cover driving device to drive the battery cover (30) to cover the charging interface (17).

11. The charging circuit (20) according to any one of claims 3 to 10, characterized in that: The N-phase winding (13) reuses the multi-phase coils of the motor, and the N-phase bridge arm (12) reuses the multi-phase bridge arm of the motor controller.

12. The charging circuit (20) according to claim 11, characterized in that: The motor includes a driving motor or an air-conditioning compressor, and the motor controller includes a motor controller corresponding to the driving motor or a motor controller corresponding to the air-conditioning compressor.

13. A vehicle (10), characterized in that: The charging circuit (20) comprises the charging circuit (20) according to any one of claims 1 to 12.

Images