Voltage control circuit and vehicle

Abstract

The present disclosure relates to a voltage control circuit and a vehicle, the voltage control circuit comprising: a power battery pack; a first switch K1, the first end of the first switch K1 is connected to the positive electrode of the power battery pack, and the second end of the first switch K1 is coupled to the positive electrode of the charging port; a second switch K2, the first end of the second switch K2 is connected to the negative electrode of the power battery pack, and the second end of the second switch K2 is coupled to the negative electrode of the charging port; a third switch K3, the first end of the third switch K3 is respectively connected to the first end of the first switch K1 and the positive electrode of the power battery pack; a driving circuit, the driving circuit comprising a driving capacitor Cx, a three-phase inverter and a three-phase motor, the three-phase inverter is connected to the three-phase motor, and the three-phase motor is connected to the third switch K3. The present disclosure can maintain full-power charging throughout the entire process by directly connecting switches K1 and K2 to the battery pack and introducing switch S7.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a voltage control circuit and a vehicle. Background Art

[0002] With the gradual development of the automobile industry, a large number of electric vehicles have appeared on the market. Electric vehicles are powered by on-board power supplies to drive the vehicle. As the number of electric vehicles increases, charging piles have also appeared. Charging piles can charge electric vehicles to provide driving energy for the vehicle.

[0003] However, in the related art, there is a situation where the voltage of the charging pile does not match the voltage of the power battery pack, which will lead to low charging efficiency of the battery pack. Therefore, how to better charge the battery pack is a technical problem that needs to be solved urgently. Summary of the invention

[0004] To overcome the problems existing in the related art, the present disclosure provides a voltage control circuit and a vehicle.

[0005] According to a first aspect of an embodiment of the present disclosure, a voltage control circuit is provided, the voltage control circuit comprising:

[0006] Power battery pack;

[0007] A first switch K1, wherein a first end of the first switch K1 is connected to the positive electrode of the power battery pack, and a second end of the first switch K1 is coupled to the positive electrode of the charging port;

[0008] A second switch K2, wherein a first end of the second switch K2 is connected to the negative electrode of the power battery pack, and a second end of the second switch K2 is coupled to the negative electrode of the charging port;

[0009] a third switch K3, wherein a first end of the third switch K3 is respectively connected to a first end of the first switch K1 and a positive electrode of the power battery pack;

[0010] A driving circuit, the driving circuit comprising a driving capacitor Cx, a three-phase inverter and a three-phase motor, the first end of the driving capacitor Cx being respectively connected to the positive electrode of the charging port and the second end of the first switch K1, the second end of the driving capacitor Cx being respectively connected to the negative electrode of the charging port and the second end of the second switch K2, the three-phase inverter being connected to the three-phase motor, and the three-phase motor being connected to the third switch K3.

[0011] Optionally, the midpoints of the three-phase bridge arms of the three-phase inverter are respectively connected to the three-phase coils of the three-phase motor, the first ends of the three-phase bridge arms are connected together to form a first bus terminal, and the second ends of the three-phase bridge arms are connected together to form a second bus terminal, the first bus terminal is respectively connected to the first end of the driving capacitor Cx, the second end of the first switch K1 and the positive electrode of the charging port, and the second bus terminal is respectively connected to the second end of the driving capacitor Cx, the second end of the second switch K2 and the negative electrode of the charging port.

[0012] Optionally, the voltage control circuit further includes:

[0013] A fourth switch K4, wherein a first end of the fourth switch K4 is connected to the positive electrode of the charging port, and a second end of the fourth switch K4 is respectively connected to the second end of the first switch K1, the first end of the driving capacitor Cx, and the first bus terminal;

[0014] A fifth switch K5, wherein a first end of the fifth switch K5 is connected to the negative electrode of the charging port, and a second end of the fifth switch K5 is respectively connected to the second end of the second switch K2, the second end of the driving capacitor Cx and the second bus terminal.

[0015] Optionally, the voltage control circuit further includes:

[0016] A pre-charging circuit, the pre-charging circuit includes a pre-charging resistor R1 and a pre-charging relay K6, the first end of the pre-charging resistor R1 is respectively connected to the negative electrode of the power battery pack and the first end of the second switch K2, the second end of the pre-charging resistor R1 is connected to the first end of the pre-charging relay K6, and the second end of the pre-charging relay K6 is respectively connected to the second end of the second switch K2, the second end of the fifth switch K5, the second end of the driving capacitor Cx and the second bus terminal.

[0017] Optionally, the voltage control circuit is configured as:

[0018] When it is determined that the voltage of the power battery pack is less than the voltage of the charging pile, the third switch K3 and the pre-charge relay K6 are controlled to be closed, so as to pre-charge the voltage of the driving capacitor Cx to the first voltage.

[0019] Optionally, the voltage control circuit is further configured to:

[0020] The upper bridge arm and the lower bridge arm of the three-phase bridge arm are controlled to be alternately opened and closed, so as to adjust the voltage of the driving capacitor Cx from the first voltage to the target voltage.

[0021] Optionally, the voltage control circuit is further configured to:

[0022] Controlling the lower bridge arm of the three-phase bridge arm to close, so as to complete the charging of the three-phase coil;

[0023] The lower bridge arm of the three-phase bridge arm is controlled to be disconnected, and the upper bridge arm of the three-phase bridge arm is controlled to be closed, so that the three-phase coil and the power battery pack charge the driving capacitor Cx to adjust the voltage of the driving capacitor Cx to the target voltage.

[0024] Optionally, the voltage control circuit is further configured to:

[0025] Controlling the fourth switch K4 and the fifth switch K5 to close;

[0026] Controlling the upper bridge arm of the three-phase bridge arm to close so that the charging pile charges the power battery pack;

[0027] The lower bridge arm of the three-phase bridge arm is controlled to be closed, so that the three-phase coil charges the power battery pack, and the upper bridge arm and the lower bridge arm of the three-phase bridge arm are alternately opened and closed to achieve step-down charging.

[0028] Optionally, the second ends of the three-phase coils of the three-phase motor are connected together to form a neutral point, and the neutral point is connected to the second end of the third switch K3, or the first ends of the three-phase coils of the three-phase motor are connected to the second end of the third switch K3.

[0029] According to a first aspect of an embodiment of the present disclosure, a vehicle is provided, the vehicle comprising the voltage control circuit described in any one of the first aspects.

[0030] In the present disclosure, the voltage control circuit may include a power battery pack, a first switch K1, a second switch K2, a third switch K3 and a driving circuit, wherein a first end of the first switch K1 is connected to the positive electrode of the power battery pack, a second end of the first switch K1 is coupled to the positive electrode of the charging port, a first end of the second switch K2 is connected to the negative electrode of the power battery pack, a second end of the second switch K2 is coupled to the negative electrode of the charging port, a first end of the third switch K3 is respectively connected to the first end of the first switch K1 and the positive electrode of the power battery pack, the driving circuit includes a driving capacitor Cx, a three-phase inverter and a three-phase motor, a first end of the driving capacitor Cx is respectively connected to the positive electrode of the charging port and the second end of the first switch K1, a second end of the driving capacitor Cx is respectively connected to the negative electrode of the charging port and the second end of the second switch K2, a three-phase inverter is connected to the three-phase motor, and the three-phase motor is connected to the third switch K3. By connecting the first switch K1 and the second switch K2 to the power battery pack and introducing the third switch K3, not only can the power-up charging be achieved, but also the full-power charging can be maintained throughout the process.

[0031] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0033] Figure 1 is a schematic diagram of a boost charging circuit according to an exemplary embodiment.

[0034] Figure 2 is a schematic diagram of a voltage control circuit according to an exemplary embodiment.

[0035] Figure 3 The diagram is a schematic diagram showing that a first end of a three-phase coil in a voltage control circuit is connected to a third switch according to an exemplary embodiment.

[0036] Figure 4 The diagram is a schematic diagram of current flow when precharging a driving capacitor in a voltage control circuit according to an exemplary embodiment.

[0037] Figure 5 The diagram is a schematic diagram showing the flow of current when charging an inductor in a voltage control circuit according to an exemplary embodiment.

[0038] Figure 6 It is a schematic diagram of current flow when charging a driving capacitor Cx based on a power battery pack and an inductor in a voltage control circuit according to an exemplary embodiment.

[0039] Figure 7 The present invention is a schematic diagram showing the flow of current when a charging pile in a voltage control circuit charges a power battery pack according to an exemplary embodiment.

[0040] Figure 8 The diagram is a schematic diagram showing the flow of current when an inductor in a voltage control circuit charges a power battery pack according to an exemplary embodiment.

[0041] Fig. 9 The figure is an example diagram showing advantages of power-up charging in a voltage control circuit according to an exemplary embodiment.

[0042] Fig.10 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0043] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0044] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0045] In the description of the present disclosure, the terms used, such as "first", "second", etc., are used to distinguish similar objects and do not have to be understood as a specific order or sequence. In addition, in the description with reference to the accompanying drawings, the same symbols in different drawings represent the same elements unless otherwise stated.

[0046] The embodiments described in some embodiments of the present disclosure below do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0047] At present, the charging speed of the battery is a point that users are more concerned about. In order to increase the charging speed of the battery, people propose to shorten the charging time by increasing the charging power. Among them, there are two ways to increase the charging power. The first is to increase the current, such as increasing the battery charging rate current (5C charging, etc.); the second is to increase the charging voltage, such as the proposal of an 800V charging voltage platform.

[0048] However, high-rate charging methods that increase charging current usually require the installation of proprietary charging piles to meet the needs of high current. For example, private supercharging piles such as Zeekr Tesla. Furthermore, the construction of a large number of private supercharging piles also requires huge costs.

[0049] In addition, the charging voltage is usually determined by the design voltage of the battery pack during the charging process, that is, the charging voltage is limited to the design voltage of the battery pack. For example, the battery pack voltage is set to 800V, which is twice the traditional 400V voltage platform.

[0050] In some embodiments, the circuit corresponding to the charging voltage boosting method may be as follows: Figure 1 As shown, based on Figure 1It is known that when charging a battery pack with a charging pile, the charging pile can be directly connected to the battery pack, that is, the voltage output by the charging pile is consistent with the voltage of the battery pack, which results in a low charging rate for the battery pack. For example, the charging pile voltage (750V) is higher than the battery pack voltage (500V), and during the charging process, the charging pile can only output a voltage of 500V.

[0051] In order to solve the above problems, the embodiment of the present disclosure shows a voltage control circuit, based on which the voltage control circuit can increase the battery pack voltage to the maximum voltage of the charging pile. Since the maximum current of the charging pile of the national standard is limited to 250A, the embodiment of the present disclosure can increase the charging power of the battery pack by increasing the output voltage of the charging pile. Specifically, the embodiment of the present disclosure can maintain full-power charging throughout the whole process by directly connecting the first switch K1 and the second switch K2 to the power battery pack and introducing the third switch K3, thereby shortening the charging time of the battery pack.

[0052] Figure 2 is a block diagram of a voltage control circuit according to an exemplary embodiment. Figure 2 As shown, the voltage control circuit 100 may include a power battery pack 111 , a first switch K1 , a second switch K2 , a third switch K3 and a drive circuit 120 .

[0053] In the disclosed embodiment, the voltage control circuit 100 may include a battery pack assembly 110 and a drive circuit 120, wherein the drive circuit 120 may be an electric drive assembly, and the battery pack assembly 110 may include a power battery pack 111, a first switch K1, a second switch K2, and a third switch K3.

[0054] Specifically, the first end of the first switch K1 can be connected to the positive electrode of the power battery 111, and the second end of the first switch K1 can be coupled to the positive electrode of the charging port 130. The first end of the second switch K2 can be connected to the negative electrode of the power battery pack 111, and the second end of the second switch K2 can be coupled to the negative electrode of the charging port 130. Here, the charging port 130 is used to connect to the charging pile, the first switch K1 can be a positive relay, and the second switch K2 can be a negative relay.

[0055] In addition, the first end of the third switch K3 can be connected to the first end of the first switch K1 and the positive electrode of the power battery pack respectively. The third switch K3 can be a newly added relay, which can be used to connect the neutral point of the motor and the positive electrode of the power battery pack.

[0056] In some embodiments, the driving circuit may include a driving capacitor Cx, a three-phase inverter 121, and a three-phase motor 122. The first end of the driving capacitor Cx may be connected to the positive electrode of the charging port 130 and the second end of the first switch K1, respectively, and the second end of the driving capacitor Cx may be connected to the negative electrode of the charging port 130 and the second end of the second switch K2, respectively. The three-phase inverter 121 may be connected to the three-phase motor 122, and the three-phase motor 122 may also be connected to the third switch K3.

[0057] Here, the midpoints of the three-phase bridge arms of the three-phase inverter 121 can be respectively connected to the three-phase coils of the three-phase motor 122, the first ends of the three-phase bridge arms are connected together to form a first bus terminal, and the second ends of the three-phase bridge arms are connected together to form a second bus terminal. The first bus terminal can be respectively connected to the first end of the driving capacitor Cx, the second end of the first switch K1, and the positive electrode of the charging port 130, and the second bus terminal can be respectively connected to the second end of the driving capacitor Cx, the second end of the second switch K2, and the negative electrode of the charging port 130.

[0058] In other embodiments, the voltage control circuit 100 may further include a fourth switch K4 and a fifth switch K5, which may belong to the battery pack assembly 110. Specifically, the first end of the fourth switch K4 may be connected to the positive electrode of the charging port 130, and the second end of the fourth switch K4 may be connected to the second end of the first switch K1, the first end of the driving capacitor Cx, and the first bus terminal of the three-phase inverter 121, respectively.

[0059] Optionally, a first end of the fifth switch K5 may be connected to the negative electrode of the charging port 130 , and a second end of the fifth switch K5 may be connected to the second end of the second switch K2 , the second end of the driving capacitor Cx and the second bus terminal of the three-phase inverter 121 , respectively.

[0060] Here, the fourth switch K4 may be a DC charging positive electrode relay, and the fifth switch K5 may be a DC charging negative electrode relay.

[0061] In other embodiments, the voltage control circuit 100 may further include a pre-charging circuit, which may belong to the battery pack assembly 110. Specifically, the pre-charging circuit may include a pre-charging resistor R1 and a pre-charging relay K6. Among them, the first end of the pre-charging resistor R1 may be connected to the negative electrode of the power battery pack 111 and the first end of the second switch K2, respectively, and the second end of the pre-charging resistor R1 may be connected to the first end of the pre-charging relay K6. The second end of the pre-charging relay K6 may be connected to the second end of the second switch K2, the second end of the fifth switch K5, the second end of the driving capacitor Cx, and the second bus terminal of the three-phase inverter 121, respectively.

[0062] In a specific embodiment, when the three-phase inverter 121 is a controllable semiconductor (bidirectional controllable), the voltage control circuit 100 may not be provided with a pre-charge circuit. Conversely, when the three-phase inverter 121 is an uncontrollable semiconductor (unidirectional controllable), the voltage control circuit 100 may be provided with a pre-charge circuit.

[0063] In the embodiment of the present disclosure, the second ends of the three-phase coils of the three-phase motor 122 are connected together to form a neutral point, and the neutral point can be connected to the second end of the third switch K3, that is, the three-phase motor 122 can be connected from the neutral point to the third switch K3 through the neutral point. In other words, the second end of the third switch K3 can be connected to the neutral point of the three-phase coils. Figure 2 As shown, it can be seen that the neutral point connection can be achieved through the N line tap.

[0064] Optionally, the first end of the three-phase coil of the three-phase motor 122 can be connected to the second end of the third switch K3. Here, the first end of the three-phase coil can be the first end of a phase coil in the three-phase coil, such as the first end of the three-phase coil can be the first end of the first phase coil, and the first end of the three-phase coil can also be the first end of the second phase coil or the third phase coil. In other words, one of the three-phase bridge arms has a line output, and is connected to the third switch K3 through the line, that is, the second end of the third switch K3 can be connected to a bridge arm in the three-phase bridge arm, as shown in detail. Figure 3 As shown, through Figure 3 It is known that the outgoing line of one of the bridge arms can be realized by phase line tapping.

[0065] As an optional method, the voltage control circuit 100 can be configured to: when it is determined that the voltage of the power battery pack 111 is less than the voltage of the charging pile, control the third switch K3 and the pre-charge relay K6 to close, so as to pre-charge the voltage of the drive capacitor Cx to the first voltage. At this time, if there is a reverse diode on the switch of the electric drive, the embodiment of the present disclosure can directly complete the pre-charging of the drive capacitor Cx.

[0066] That is to say, when it is determined that the maximum voltage of the charging pile is greater than the maximum voltage of the battery pack, the embodiment of the present disclosure can increase the output voltage of the charging pile through the voltage control circuit 100 to achieve an increase in charging power. The voltage control circuit 100 can be a power boost architecture.

[0067] Similarly, when it is determined that the maximum voltage of the charging pile is equal to the maximum voltage of the battery pack, since the voltage of the battery is lower when the SOC (System on Chip) is low, the low SOC charging voltage can be increased through the voltage control circuit 100, thereby achieving full-power charging throughout the entire process.

[0068] Optionally, if it is determined that the switch tube is set to be unidirectional, the embodiment of the present disclosure can control the upper bridge arm to close to complete the pre-charging of the driving capacitor Cx, or it can first close the lower bridge arm and then close the upper bridge arm to boost the voltage to increase the voltage of the driving capacitor Cx to the target voltage.

[0069] Specifically, for a unidirectional switch tube, the embodiment of the present disclosure can complete the pre-charging of the driving capacitor Cx by controlling the duty cycle of the upper tube, and the voltage of the driving capacitor Cx is consistent with the voltage of the power battery pack 111. Optionally, for a bidirectional switch tube, the current can be directly pre-charged to the driving capacitor Cx through a reverse diode.

[0070] At this time, the current flow direction can be as follows Figure 4 As shown, through Figure 4 It is known that when the power battery pack 111 is used to pre-charge the driving capacitor Cx, the corresponding current flow direction can be: the positive electrode of the power battery pack 111, the third switch K3, the three-phase coil, the upper bridge arm of the three-phase bridge arm, the driving capacitor Cx, the pre-charging relay K6, the pre-charging resistor R1, and the negative electrode of the power battery pack 111.

[0071] It can be seen from the above technical solution that when it is determined that the voltage of the power battery pack is less than the voltage of the charging pile, the embodiment of the present disclosure can realize the pre-charging of the driving capacitor Cx by controlling the third switch K3 and the pre-charging relay K6 to be closed. After the pre-charging is completed, the voltage of the driving capacitor Cx is the same as the voltage of the power battery pack 111, the system reaches a steady state, and the loop current can be reduced to 0A. At this time, the voltage control circuit can be configured to: control the sixth switch K6 to be disconnected, and control the second switch K2 to be closed.

[0072] On this basis, the voltage control circuit 100 can also be configured to control the upper bridge arm and the lower bridge arm of the three-phase bridge arm to be alternately opened and closed to adjust the voltage of the driving capacitor Cx from the first voltage to the target voltage. Here, the first voltage can be less than the target voltage.

[0073] For example, the voltage of the charging pile is 750V, and the voltage of the power battery pack is 500V. The voltage of the driving capacitor Cx can be increased to the first voltage by precharging, and the first voltage at this time can be 500V. Afterwards, the voltage control circuit 100 can control the upper bridge arm and the lower bridge arm of the three-phase bridge arm to alternately open and close, so as to increase the voltage of the driving capacitor Cx from the first voltage 500V to the target voltage 750V.

[0074] As a specific implementation, the voltage control circuit 100 can also be configured to: control the lower bridge arm of the three-phase bridge arm to close, complete the charging of the three-phase coil, control the lower bridge arm of the three-phase bridge arm to disconnect, and control the upper bridge arm of the three-phase bridge arm to close, so that the three-phase coil and the power battery pack 111 charge the driving capacitor Cx to adjust the voltage of the driving capacitor Cx to the target voltage.

[0075] That is to say, after determining that the pre-charging is completed, the embodiment of the present disclosure can control the upper and lower tubes of the three-phase bridge arm to open and close alternately through reverse boosting to increase the voltage of the driving capacitor Cx on the DC side of the electric drive to the target voltage, which can be the charging pile voltage, that is, it can be boosted according to the highest insulation voltage monitored by the charging port.

[0076] Specifically, the embodiment of the present disclosure can open the lower switch tube of the three-phase bridge arm to complete the charging of the inductor. At this time, the current flow direction can be as follows: Figure 5 As shown, based on Figure 5 It is known that when charging the inductor, the corresponding current flow direction can be: the positive electrode of the power battery pack 111, the third switch K3, the three-phase coil, the lower bridge arm of the three-phase bridge arm, the second switch K2, and the negative electrode of the power battery pack 111.

[0077] Optionally, after the lower bridge arm closing time reaches a preset time, the embodiment of the present disclosure can control the lower bridge arm to be disconnected, and control the upper bridge arm of the three-phase bridge arm to be closed, so that the three-phase coil and the power battery pack charge the driving capacitor Cx. In other words, the upper bridge arm is turned on to charge the driving capacitor Cx using the power battery pack 111 and the inductor at the same time, so as to raise the voltage of the driving capacitor Cx to the target voltage. At this time, the current flow direction can be as follows: Figure 6 As shown, when the power battery pack and the inductor are used to charge the driving capacitor Cx at the same time, the current flow direction can be: the positive electrode of the power battery pack 111, the third switch K3, the three-phase coil, the upper bridge arm of the three-phase bridge arm, the driving capacitor Cx, the second switch K2, and the negative electrode of the power battery pack 111.

[0078] In this process, the embodiment of the present disclosure can obtain the voltage of the DC charging port, and adjust the voltage of the driving capacitor Cx to the target voltage based on the voltage of the DC charging port. Here, the target voltage can be the voltage of the DC charging port. In order to obtain the voltage of the DC charging port, the embodiment of the present disclosure can be provided with a voltage sensor at the rear end of the fourth switch K4 and the fifth switch K5, based on which the highest insulation detection voltage of the DC charging pile can be collected. When the electric drive is reversely pre-charged, the highest insulation detection voltage of the DC charging pile can be used as the target value.

[0079] Optionally, when the insulation detection voltage of the charging port is not detected, or the highest voltage sent by the charging pile is greater than the insulation detection voltage, the embodiment of the present disclosure can start from the real-time voltage of the power battery pack 111 and enter the charging process to maintain a certain charging current. On this basis, the voltage of the charging port 130 is gradually raised until the voltage of the charging port 130 cannot be raised.

[0080] In addition, when the specific charging current cannot maintain the target current and drop to the set value, or the charging port voltage cannot rise, the disclosed embodiment can repeat the voltage increase multiple times. Specifically, by reducing the duty cycle of the switch tube or adjusting the ratio of the upper and lower switch tubes, the voltage can be increased multiple times, so that the power battery pack can be charged at the highest possible voltage.

[0081] As another optional method, after the voltage of the driving capacitor Cx is increased to the target voltage, the voltage control circuit can also be configured to: control the fourth switch K4 and the fifth switch K5 to close, so as to wait for the charging pile to output and start step-down charging.

[0082] Specifically, the upper bridge arm of the three-phase bridge arm is controlled to close by the voltage control circuit 100, so that the charging pile charges the power battery pack 111. At this time, the current flow direction can be as follows: Figure 7 As shown, based on Figure 7 It is known that the specific current flow direction at this time can be: the positive pole of the charging port 130, the fourth switch K4, the upper bridge arm of the three-phase bridge arm, the three-phase coil, the third switch K3, the power battery pack 111, the second switch K2, the fifth switch K5, and the negative pole of the charging port 130.

[0083] In addition, the embodiment of the present disclosure can control the closing of the lower bridge arm of the three-phase bridge arm through the voltage control circuit 100, so that the three-phase coil charges the power battery pack 111, and alternately opens and closes the upper bridge arm and the lower bridge arm of the three-phase bridge arm to achieve voltage reduction charging. At this time, the current flow direction can be as follows Figure 8 As shown, based on Figure 8 It is known that the specific current flow direction at this time can be: the first end of the three-phase coil (inductor), the upper bridge arm of the three-phase bridge arm, the third switch K3, the power battery pack 111, the second switch K2, and the second end of the three-phase coil (inductor).

[0084] In summary, the embodiment of the present disclosure can increase the charging pile voltage (battery pack voltage) to the maximum voltage of the charging pile through the voltage control circuit 100. Since the maximum current limit of the charging pile of the national standard is 250A, the charging power can be increased by increasing the output voltage of the charging pile. In addition, since the voltage is low when the battery pack SOC is low, the voltage control circuit 100 can raise the charging port voltage to achieve high-power charging to maintain full-power charging throughout the entire process. In order to illustrate the advantages of charging with the voltage control circuit 100, the embodiment of the present disclosure provides the following Fig. 9Schematic diagram shown.

[0085] Fig. 9 In the figure, 901 is the battery voltage, 902 is the charging current, 903 is the non-increased power charging power, and 904 is the increased power charging power. By comparing the four, we can know that the increased power charging power can achieve full-power charging throughout the entire process, thereby greatly shortening the charging time. Fig. 9 The triangle 905 shown indicates the benefit of charging by using the voltage control circuit 100, that is, the charging time can be shortened. It can be seen that the voltage control circuit 100 proposed based on the embodiment of the present disclosure can achieve a charging voltage boost in the entire range, thereby significantly shortening the charging time.

[0086] In the embodiment of the present disclosure, the voltage control circuit may include a power battery pack, a first switch K1, a second switch K2, a third switch K3 and a driving circuit, wherein a first end of the first switch K1 is connected to the positive electrode of the power battery pack, a second end of the first switch K1 is coupled to the positive electrode of the charging port, a first end of the second switch K2 is connected to the negative electrode of the power battery pack, a second end of the second switch K2 is coupled to the negative electrode of the charging port, a first end of the third switch K3 is respectively connected to the first end of the first switch K1 and the positive electrode of the power battery pack, the driving circuit includes a driving capacitor Cx, a three-phase inverter and a three-phase motor, a first end of the driving capacitor Cx is respectively connected to the positive electrode of the charging port and the second end of the first switch K1, a second end of the driving capacitor Cx is respectively connected to the negative electrode of the charging port and the second end of the second switch K2, a three-phase inverter is connected to the three-phase motor, and the three-phase motor is connected to the third switch K3. By connecting the first switch K1 and the second switch K2 to the power battery pack and introducing the third switch K3, not only can the power-up charging be achieved, but also the full-power charging can be maintained throughout the process.

[0087] Fig.10 1 is a block diagram of a vehicle according to an exemplary embodiment. The vehicle 1000 is provided with a voltage control circuit 100 shown in the embodiment of the present disclosure.

[0088] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0089] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and beneficial to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in a specific embodiment or claim, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0090] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0091] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0092] In the above detailed description, reference is made to the accompanying drawings, which illustrate specific aspects of the present disclosure that can be practiced by way of illustration. In this regard, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or representing positional relationships, can be used with reference to the orientation of the described figures. Since the components of the described device can be positioned in a plurality of different orientations, directional terms can be used for illustrative purposes rather than restrictive. It should be understood that other aspects can be utilized and structural or logical changes can be made without departing from the concepts of the present disclosure. Therefore, the following detailed description should not be considered in a limiting sense.

[0093] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more; similarly, "at least one of . . . " includes any one of the related listed items and any combination of any two or more.

[0094] It should be understood that, unless otherwise clearly specified and limited, the terms "joining", "attaching", "installing", "connecting", "connecting", "fixing" and the like used in the embodiments of the present disclosure should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0095] In addition, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may be used herein to indicate that the component, element or material layer is "indirectly" positioned (e.g., placed, formed, deposited, etc.) on the surface such that one or more additional components, elements or layers are arranged between the surface and the component, element or material layer. However, the term "above" used in relation to a component, element or material layer formed "above" or located "above" a surface may also optionally have a specific meaning: the component, element or material layer is "directly" positioned (e.g., placed, formed, deposited, etc.) on the surface, such as in direct contact with the surface.

[0096] Although terms such as "first", "second" and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of each example, the first component, component, region, layer or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may expressly or implicitly include at least one of the features. In the description herein, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0097] It should be understood that spatially relative terms such as "above", "upper", "below", and "lower" are used herein to describe the relationship of one element to another element shown in the figures. In addition to the orientation depicted in the drawings, such spatially relative terms are also intended to include different orientations of the device in use or operation. For example, if the device in the drawings is turned over, the element described as being "above" or "upper" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" includes both upper and lower orientations. The device may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

Claims

1. A voltage control circuit, characterized in that: include: Power battery pack; A first switch K1, wherein a first end of the first switch K1 is connected to the positive electrode of the power battery pack, and a second end of the first switch K1 is coupled to the positive electrode of the charging port; A second switch K2, wherein a first end of the second switch K2 is connected to the negative electrode of the power battery pack, and a second end of the second switch K2 is coupled to the negative electrode of the charging port; a third switch K3, wherein a first end of the third switch K3 is respectively connected to a first end of the first switch K1 and a positive electrode of the power battery pack; A driving circuit, the driving circuit comprising a driving capacitor Cx, a three-phase inverter and a three-phase motor, wherein a first end of the driving capacitor Cx is respectively connected to a positive electrode of the charging port and a second end of the first switch K1, a second end of the driving capacitor Cx is respectively connected to a negative electrode of the charging port and a second end of the second switch K2, the three-phase inverter is connected to the three-phase motor, and the three-phase motor is connected to the third switch K3; The voltage control circuit is configured as follows: When it is determined that the voltage of the power battery pack is less than the voltage of the charging pile, the second switch K2 and the third switch K3 are controlled to be closed, and the lower bridge arm of the three-phase bridge arm of the three-phase inverter is controlled to be closed, so as to complete the charging of the three-phase coils of the three-phase motor; The lower bridge arm of the three-phase bridge arm is controlled to be disconnected, and the upper bridge arm of the three-phase bridge arm is controlled to be closed, so that the three-phase coil and the power battery pack charge the driving capacitor Cx, so as to adjust the voltage of the driving capacitor Cx to the target voltage, thereby realizing reverse pre-charging of the electric drive.

2. The voltage control circuit according to claim 1, characterized in that: The midpoints of the three-phase bridge arms of the three-phase inverter are respectively connected to the three-phase coils of the three-phase motor, the first ends of the three-phase bridge arms are connected together to form a first bus terminal, and the second ends of the three-phase bridge arms are connected together to form a second bus terminal, the first bus terminal is respectively connected to the first end of the driving capacitor Cx, the second end of the first switch K1 and the positive electrode of the charging port, and the second bus terminal is respectively connected to the second end of the driving capacitor Cx, the second end of the second switch K2 and the negative electrode of the charging port.

3. The voltage control circuit according to claim 2, characterized in that: The voltage control circuit further includes: A fourth switch K4, wherein a first end of the fourth switch K4 is connected to the positive electrode of the charging port, and a second end of the fourth switch K4 is respectively connected to the second end of the first switch K1, the first end of the driving capacitor Cx, and the first bus terminal; A fifth switch K5, wherein a first end of the fifth switch K5 is connected to the negative electrode of the charging port, and a second end of the fifth switch K5 is respectively connected to the second end of the second switch K2, the second end of the driving capacitor Cx and the second bus terminal.

4. The voltage control circuit according to claim 3, characterized in that: The voltage control circuit is further configured to: Controlling the fourth switch K4 and the fifth switch K5 to close; Controlling the upper bridge arm of the three-phase bridge arm to close so that the charging pile charges the power battery pack; The lower bridge arm of the three-phase bridge arm is controlled to be closed, so that the three-phase coil charges the power battery pack, and the upper bridge arm and the lower bridge arm of the three-phase bridge arm are alternately opened and closed to achieve step-down charging.

5. The voltage control circuit according to claim 1, characterized in that: The second ends of the three-phase coils of the three-phase motor are connected together to form a neutral point, and the neutral point is connected to the second end of the third switch K3, or the first ends of the three-phase coils of the three-phase motor are connected to the second end of the third switch K3.

6. A vehicle, characterized in that: The voltage control circuit comprises any one of claims 1 to 5.

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