Charging circuit and vehicle

Abstract

The invention relates to the technical field of battery charging, and provides a charging circuit and a vehicle, the charging circuit comprises a power battery, a charging interface and at least one inductor, and the power battery, the at least one inductor and the charging interface are connected in sequence; the charging interface is used for connecting a charging gun capacitor; the power battery is suitable for pre-charging the charging gun capacitor through at least one inductor. The charging gun capacitor is pre-charged to provide an initial voltage to the charging gun capacitor, so that the voltage surge and the current peak value during charging starting can be reduced, overload and damage of circuit elements are avoided, and the reliability and the service life of a charging circuit are improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery charging, and more particularly, to a charging circuit and a vehicle. Background Art

[0002] With the continuous development of vehicle technology and the popularization of electric vehicles, DC fast charging technology for electric vehicles has become increasingly common.

[0003] In related technologies, when a charging gun charges a vehicle, if the charging gun is directly connected to the vehicle for charging, it may cause overload and damage to circuit components (such as power batteries) due to factors such as voltage impact or current peak during current startup. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a charging circuit and a vehicle to solve the problems in related technologies.

[0005] To achieve the above purpose, in the first aspect of the embodiments of the present disclosure, a charging circuit is provided. The charging circuit includes a power battery, a charging interface, and at least one inductor, and the power battery, the at least one inductor, and the charging interface are connected in sequence;

[0006] The charging interface is used to connect to a charging gun capacitor;

[0007] The power battery is adapted to pre-charge the charging gun capacitor through the at least one inductor.

[0008] Optionally, the charging circuit further includes at least one switch unit. The power battery, the at least one inductor, at least one switch unit, and the charging interface are connected in sequence, and the power battery is adapted to pre-charge the charging gun capacitor through the at least one inductor and at least one switch unit.

[0009] Optionally, the at least one switch unit includes an N-phase bridge arm, and the at least one inductor includes N-phase windings corresponding one-to-one to the N-phase bridge arm. Among them, each phase winding is connected to the midpoint of the corresponding bridge arm, and N≥1;

[0010] The positive pole of the power battery is connected to the first busbar end of the N-phase bridge arm, the first busbar end is connected to the charging interface, and the negative pole of the power battery is connected to the second busbar end of the N-phase bridge arm;

[0011] The charging interface is also connected to the midpoint of any one of the bridge arms.

[0012] Optionally, the charging interface includes a positive interface and a negative interface;

[0013] The positive electrode interface is connected to the first busbar end, and the positive electrode interface is used to connect to the first end of the charging gun capacitor;

[0014] The negative electrode interface is connected to the midpoint of any one 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:

[0015] A controller, the controller is connected to the N-phase bridge arm;

[0016] The controller is configured to: control the N-phase bridge arm such that the power battery charges the charging gun capacitor through the N-phase winding and the N-phase bridge arm.

[0017] Optionally, the N-phase bridge arm is a three-phase bridge arm, and the N-phase winding is a three-phase winding;

[0018] The controller is configured to control the three-phase bridge arm to sequentially cycle through a first state, a second state, a third state, and a fourth state, such that the power battery steps down to charge the charging gun capacitor:

[0019] Wherein, in the first state, the upper bridge arms in the three-phase bridge arm 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 conducting, and the other lower bridge arm in the bridge arm not connected to the negative electrode interface is disconnected;

[0020] In the second state, the upper bridge arms in the three-phase bridge arm are all disconnected, and the lower bridge arms in the three-phase bridge arm are all disconnected;

[0021] In the third state, the upper bridge arms in the three-phase bridge arm are all disconnected, the lower bridge arm in the bridge arm connected to the negative electrode interface is disconnected, and the lower bridge arms in the bridge arms not connected to the negative electrode interface are all conducting;

[0022] In the fourth state, the upper bridge arms in the three-phase bridge arm are all disconnected, and the lower bridge arms in the three-phase bridge arm are all disconnected.

[0023] Optionally, the controller is configured to:

[0024] Control any one of the lower bridge arms in the N-phase bridge arm to conduct, such that the charging gun charges the power battery.

[0025] Optionally, the charging circuit further includes:

[0026] A bus capacitor, one end of the bus capacitor is connected to the first busbar end of the N-phase bridge arm, and the second end of the bus capacitor is connected to the second busbar end of the N-phase bridge arm.

[0027] Optionally, the charging circuit further includes:

[0028] A switch, the power battery is connected to the charging interface through the switch.

[0029] Optionally, the charging circuit further includes: a controller,

[0030] The controller is configured to: in the case where the switch is sintered, control the battery cover driving device to drive the battery cover to cover the charging interface. Optionally, the multi-phase coils of the N-phase winding multiplexing motor, and the multi-phase bridge arms of the N-phase bridge arm multiplexing motor controller.

[0031] 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.

[0032] According to a second aspect of the disclosed embodiment, a vehicle is further provided, including the charging circuit provided in any one of the first aspects of the disclosed embodiments.

[0033] Through the above technical solution, the charging circuit includes a power battery, a charging interface and at least one inductor. The power battery, at least one inductor and the charging interface are connected in sequence; the charging interface is used to connect the charging gun capacitor; the power battery pre-charges the charging gun capacitor through at least one inductor. Pre-charging the charging gun capacitor to give an initial voltage to the charging gun capacitor can reduce the voltage impact and current peak value at the start of charging, avoid the overload and damage of circuit components, and thus improve the reliability and life of the charging circuit.

[0034] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0035] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. Together with the following specific implementation, they are used to explain the present disclosure, but do not constitute a limitation to the present disclosure. In the drawings:

[0036] Figure 1 is a block diagram of a vehicle provided by an embodiment of the present disclosure.

[0037] Figure 2 is a circuit diagram of a charging circuit provided by an embodiment of the present disclosure.

[0038] Figure 3 is a circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0039] Figure 4 is a circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0040] Figure 5It is the circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0041] Figure 6 It is the circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0042] Figure 7 It is the circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0043] Figure 8 It is the circuit diagram of another charging circuit provided by an embodiment of the present disclosure.

[0044] Description of reference numerals

[0045] 10 - Vehicle; 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 implementation manners

[0046] The following will describe the detailed implementation manners of the present disclosure with reference to the accompanying drawings. It should be understood that the detailed implementation manners described herein are only used to illustrate and explain the present disclosure, and are not used to limit the present disclosure.

[0047] The terms "first", "second", etc. used in the present disclosure are used to distinguish one element from another, and do not have sequentiality and 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, the DC fast charging technology for electric vehicles is becoming more and more common.

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

[0050] To solve the above technical problems, the 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 pre-charges the charging gun capacitor through the at least one inductor. Pre-charging the charging gun capacitor to give it an initial voltage can reduce the voltage impact and current peak at the start of charging, avoid overloading and damage of circuit components, and thus improve the reliability and lifespan of the charging circuit.

[0051] As Figure 1 shown, 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] The charging interface 17 is used to connect to the charging gun capacitor.

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

[0054] Pre-charging the charging gun capacitor to give it an initial voltage can reduce the voltage impact and current peak at the start of charging, avoid overloading and damage of circuit components, and thus improve the reliability and lifespan of the charging circuit.

[0055] Compared with pre-charging using a pre-charge resistor, during the pre-charging process of the inductor, a self-induced voltage is generated when the current changes, which can cancel out the power supply voltage, thereby reducing the pre-charging current. Moreover, the generation of the self-induced voltage can also help reduce the energy loss during pre-charging. And due to the characteristics of the inductor, it can achieve more efficient energy transmission.

[0056] In a possible implementation, the charging circuit further includes 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 adapted to pre-charge the charging gun capacitor through the at least one inductor 16 and the at least one switch unit 18.

[0057] By setting the switch unit 18, the control of pre-charging start and stop is achieved.

[0058] Exemplarily, the number of switch units 18 can be equal to the number of inductors 16, and the switch units 18 and the inductors 16 can be connected in one-to-one correspondence.

[0059] In a possible implementation, please refer to Figure 2 , Figure 2 is the circuit diagram of a charging circuit provided by an embodiment of the present disclosure. As Figure 2As shown, at least one switching unit 18 includes an N-phase bridge arm 12, and at least one inductor 16 includes N-phase windings 13 corresponding one-to-one to the N-phase bridge arm 12. Wherein, each phase winding is connected to the midpoint of the corresponding bridge arm, N≥1, and N is a positive integer;

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

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

[0062] In a possible implementation manner, 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 busbar end, 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 one bridge arm, and the negative electrode interface 15 is used to connect to the second end of the charging gun capacitor C1.

[0065] In a possible implementation manner, the charging circuit includes: a power battery 11, a positive electrode interface 14, a negative electrode interface 15, an N-phase bridge arm 12, and N-phase windings 13 corresponding one-to-one 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 busbar end of the N-phase bridge arm 12, the first busbar end is connected to the positive electrode interface 14, and the negative electrode of the power battery 11 is connected to the second busbar end 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 one 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 a charging gun to realize input or output of electric energy.

[0070] Before the charging gun charges the power battery 11, it is necessary for the power battery 11 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 ends of each phase winding are commonly connected 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 one phase winding.

[0072] Through the above technical solution, the charging circuit includes a power battery 11, a positive electrode interface 14, a negative electrode interface 15, an N-phase bridge arm 12, and N-phase windings 13 corresponding to the N-phase bridge arm 12 one by one. Among them, 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 busbar end of the N-phase bridge arm 12, the first busbar end is connected to the positive electrode interface 14, and the negative electrode of the power battery 11 is connected to the second busbar end of the N-phase bridge arm 12; the positive electrode interface 14 is used to connect 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 the second end of the charging gun capacitor C1. By using any one of the N-phase bridge arms 12 as the switch at the interface, since there are multiple bridge arms in the N-phase bridge arm 12, any bridge arm is conducted each time for charging, and the multiple bridge arms jointly accumulate the charging times and share the risk of sintering to reduce the occurrence of sintering phenomenon.

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

[0074] A controller, which is connected to the N-phase bridge arm 12; the controller can 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 through the N-phase winding 13 and the N-phase bridge arm 12 with voltage reduction.

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

[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 voltage reduction circuit. The power battery 11 is reduced in voltage through the voltage reduction circuit, and the charging gun capacitor C1 is charged during the voltage reduction process. The controller controls the on-off state of the lower bridge arm in the N-phase bridge arm 12 to be switched alternately at a high frequency, and disconnects it before the pre-charge current surges to a dangerous value, so as to charge the charging gun capacitor C1 at a high frequency with a smaller current until it is full.

[0078] In a possible implementation manner, please refer to Figure 3 and Figure 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 sequentially cycle through the first state, the second state, the third state, and the fourth state, 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 turned on, 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 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, and the lower bridge arms in the bridge arms not connected to the negative electrode interface 15 are all turned on;

[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] Exemplarily, please refer to Figure 3 and Figure 4 , the N-phase bridge arm 12 is a three-phase bridge arm, which may specifically include a first bridge arm 121, a second bridge arm 122, and a third bridge arm 123. The N-phase winding 13 is a three-phase winding, which may specifically include a first-phase winding, a second-phase winding, and a third-phase winding. The first bridge arm 121 is connected to the first-phase winding, the second bridge arm 122 is connected to the second-phase winding, and the third bridge arm 123 is connected to the third-phase winding. The negative electrode interface 15 is connected to the midpoint of the third bridge arm 123, that is, the negative electrode interface 15 is connected to the first end of the third-phase winding.

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

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

[0087] In the first state, please refer toFigure 3 Among them, the upper bridge arms in the three-phase bridge arms are the first switch tube T1, the third switch tube T3, and the fifth switch tube T5 respectively. The lower bridge arm in the bridge arm connected to the negative interface 15 is the sixth switch tube T6. One of the lower bridge arms in the bridge arm not connected to the negative interface 15 can be, for example, the fourth switch tube T4, and the other lower bridge arm in the bridge arm not connected to the negative interface 15 is the fifth switch tube T5. That is, in the first state, the first switch tube T1, the second switch tube T2, the third switch tube T3, the fifth switch tube T5, and the sixth switch tube T6 are all turned off, and the fourth switch tube T4 is turned on.

[0088] In the second state, that is, 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, please refer to Figure 4 Among them, the upper bridge arms in the three-phase bridge arms are the first switch tube T1, the third switch tube T3, and the fifth switch tube T5 respectively. The lower bridge arm in the bridge arm connected to the negative interface 15 is the sixth switch tube T6. The lower bridge arms in the bridge arms not connected to the negative interface 15 are the second switch tube T2 and the fourth switch tube T4. That is, in the second state, the first switch tube T1, the third switch tube T3, the fifth switch tube T5, and the sixth switch tube T6 are all turned off, and the second switch tube T2 and the fourth switch tube T4 are turned on.

[0090] In the fourth state, that is, 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 switch tube can 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 turned off before the pre-charge current surges, 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 turned off before the pre-charge current surges, that is, the fourth state. Then it returns to the first state and continues to cycle, chopping the originally surging pre-charge current into a gently increasing pre-charge current by means of high-frequency switching of thyristors, reducing the risk of sintering of the switching devices during the pre-charge process.

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

[0094] The switch K1, and the power battery 11 is connected to the charging interface 17 through the switch K1.

[0095] Exemplarily, the first busbar end is connected to the positive electrode interface 14 through the switch K1.

[0096] Exemplarily, 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 manner, when the pre-charging is completed, the charging gun performs direct current charging on the power battery 11, and the controller is configured to:

[0099] Control any one of the lower bridge arms in the N-phase bridge arm 12 to conduct, so that the charging gun charges the power battery 11.

[0100] Please refer to Figure 5 , any one of the lower bridge arms in the N-phase bridge arm 12 is the sixth switch tube T6, the controller controls the sixth switch tube T6 to conduct, other switch tubes are turned off, and controls the switch K1 to conduct. The electric energy 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 one of the lower bridge arms in the N-phase bridge arm 12 is the fourth switch tube T4, the controller controls the fourth switch tube T4 to conduct, other switch tubes are turned off, and controls the switch K1 to conduct. The electric energy of the charging gun passes through the positive electrode interface 14, the switch K1, the power battery 11, the fourth switch tube T4, the second-phase winding, the third-phase winding, 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.

[0102] Please refer to Figure 7 , any one of the lower bridge arms in the N-phase bridge arm 12 is the second switch tube T2, the controller controls the second switch tube T2 to conduct, other switch tubes are turned off, and controls the switch K1 to conduct. The electric energy of the charging gun passes through the positive electrode interface 14, the switch K1, the power battery 11, the second switch tube T2, the first-phase winding, the third-phase winding, 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.

[0103] During the process of the charging gun charging the power battery 11, it can switch among the above three states, and 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.

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

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

[0106] In a possible embodiment, please refer to Figure 8 , in order to further avoid the sintering risk existing in the switch K1 or the N-phase bridge arm 12, the charging circuit further includes:

[0107] A controller;

[0108] The controller is configured to: in the case where 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, and even gives an alarm.

[0110] In a possible implementation manner, the N-phase winding multiplexes the multi-phase coils of the motor, and the N-phase bridge arm multiplexes the N-phase bridge arm of the motor controller.

[0111] Specifically, 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.

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

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

[0114] The embodiment of the present disclosure also provides a vehicle 10, please refer to Figure 1 , the vehicle includes the above-mentioned charging circuit.

[0115] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of 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 protection scope of the present disclosure.

[0116] In addition, it should be noted that, in the above specific embodiments, the various specific technical features described can be combined in any suitable manner without conflict. In order to avoid unnecessary repetition, the present disclosure will not separately describe various possible combination manners.

[0117] In addition, any combination can be made among various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should equally be regarded as the content disclosed by the present disclosure.

Claims

1. A charging circuit, characterized in that, the charging circuit includes a power battery, a charging interface and at least one inductor, and the power battery, the at least one inductor and the charging interface are connected in sequence; the charging interface is used to connect a charging gun capacitor; the power battery is adapted to pre-charge the charging gun capacitor through the at least one inductor.

2. The charging circuit according to claim 1, characterized in that, the charging circuit further includes at least one switch unit, the power battery, the at least one inductor, at least one switch unit and the charging interface are connected in sequence, and the power battery is adapted to pre-charge the charging gun capacitor through the at least one inductor and at least one switch unit.

3. The charging circuit according to claim 2, characterized in that, the at least one switch unit includes an N-phase bridge arm, and the at least one inductor includes N-phase windings corresponding one-to-one to the N-phase bridge arm, wherein each phase winding is connected to the midpoint of the corresponding bridge arm, N≥1; the positive pole of the power battery is connected to the first busbar end of the N-phase bridge arm, the first busbar end is connected to the charging interface, and the negative pole of the power battery is connected to the second busbar end of the N-phase bridge arm; the charging interface is also connected to the midpoint of any one of the bridge arms.

4. The charging circuit according to claim 3, characterized in that, the charging interface includes a positive interface and a negative interface; the positive interface is connected to the first busbar end, and the positive interface is used to connect the first end of the charging gun capacitor; the negative interface is connected to the midpoint of any one of the bridge arms, and the negative interface is used to connect the second end of the charging gun capacitor.

5. The charging circuit according to claim 4, characterized in that, the charging circuit further includes: a controller, the controller is connected to the N-phase bridge arm; the controller is configured to: control the N-phase bridge arm so that the power battery steps down through the N-phase windings and the N-phase bridge arm to charge the charging gun capacitor.

6. The charging circuit according to claim 5, characterized in that, the N-phase bridge arm is a three-phase bridge arm, and the N-phase winding is a three-phase winding; the controller is configured to control the three-phase bridge arm to sequentially cycle through a first state, a second state, a third state and a fourth state so that the power battery steps down to charge the charging gun capacitor: wherein, in the first state, the upper bridge arms in the three-phase bridge arm are all disconnected, the lower bridge arm in the bridge arm connected to the negative interface is disconnected, and one of the lower bridge arms in the bridge arms not connected to the negative interface is turned on, and the other lower bridge arm in the bridge arms not connected to the negative interface is disconnected; in the second state, the upper bridge arms in the three-phase bridge arm are all disconnected, and the lower bridge arms in the three-phase bridge arm are all disconnected; in the third state, the upper bridge arms in the three-phase bridge arm are all disconnected, the lower bridge arm in the bridge arm connected to the negative interface is disconnected, and the lower bridge arms in the bridge arms not connected to the negative interface are all turned on; in the fourth state, the upper bridge arms in the three-phase bridge arm are all disconnected, and the lower bridge arms in the three-phase bridge arm are all disconnected.

7. The charging circuit according to claim 5, It is characterized in that the controller is configured to control any lower arm of the N-phase bridge arm to conduct, so that the charging gun charges the power battery.

8. The charging circuit according to claim 3, It is characterized in that the charging circuit further includes a bus capacitor, one end of the bus capacitor is connected to the first busbar end of the N-phase bridge arm, and the second end of the bus capacitor is connected to the second busbar end of the N-phase bridge arm.

9. The charging circuit according to claim 1, It is characterized in that the charging circuit further includes a switch, and the power battery is connected to the charging interface through the switch.

10. The charging circuit according to claim 9, It is characterized in that the charging circuit further includes: a controller, the controller is configured to: in the case where the switch is sintered, control the battery cover driving device to drive the battery cover to cover the charging interface.

11. The charging circuit according to claim 3, It is characterized in that the N-phase winding multiplexes the multi-phase coils of the motor, and the N-phase bridge arm multiplexes the multi-phase bridge arms of the motor controller.

12. The charging circuit according to claim 11, It is characterized in that 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.

13. A vehicle, It is characterized in that it includes the charging circuit according to any one of claims 1-12.

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