Switching circuit of a vehicle, suspension system of a vehicle and vehicle

Abstract

This application discloses a conversion circuit for a vehicle, a vehicle suspension system, and a vehicle. The conversion circuit includes a bridge circuit and a controller. The bridge circuit includes a first DC connection terminal, a first AC connection terminal, and a second AC connection terminal. The first DC connection terminal is configured to connect to the vehicle's power battery, and the first AC connection terminal is configured to connect to the vehicle's AC charging port. The bridge circuit is configured as a drive circuit for the vehicle suspension. The controller is configured to, in AC charging mode, control the bridge circuit to convert AC power passing through the first AC connection terminal into DC power, and then charge the power battery through the first DC connection terminal. The conversion circuit can operate in either drive mode or AC charging mode, thus enabling the reuse of charging and drive circuits, simplifying the vehicle's circuit structure and reducing costs.

Description

Technical Field

[0001] This application relates to the field of vehicle suspension system technology, and more specifically, to a vehicle switching circuit, a vehicle suspension system, and a vehicle. Background Technology

[0002] In related technologies, a vehicle's suspension system includes a power battery, a drive module, and a motor. The drive module includes an inverter circuit that converts the direct current (DC) from the power battery into alternating current (AC) to drive the motor and adjust the vehicle's ride height. On the other hand, the vehicle also includes a charging module, which includes a rectifier circuit that converts AC to DC to charge the power battery. The vehicle's circuitry is complex, with numerous components, resulting in high costs. Summary of the Invention

[0003] This application provides a vehicle switching circuit, a vehicle suspension system, and a vehicle.

[0004] The conversion circuit provided in this application includes a bridge circuit and a controller. The bridge circuit includes a first DC connection terminal and a first AC connection terminal. The first DC connection terminal is configured to connect to the vehicle's power battery, and the first AC connection terminal is configured to connect to the vehicle's AC charging port. The bridge circuit is configured as a drive circuit for the vehicle's suspension. The controller is configured to, in AC charging mode, control the bridge circuit to convert the AC power passing through the first AC connection terminal into DC power, and then charge the power battery through the first DC connection terminal.

[0005] The conversion circuit provided in this application can operate in either drive mode or AC charging mode. In drive mode, the bridge circuit and the power battery combine to form the motor drive circuit. The controller can control the bridge circuit to convert the DC power supplied by the power battery into AC power and drive the suspension system motor to adjust the vehicle height. In AC charging mode, the connection terminals of the AC charging port and the bridge circuit form the power battery charging circuit. The controller can control the bridge circuit to convert the AC power connected to the connection terminals of the AC charging port into DC power and charge the power battery. The conversion circuit can reuse the charging circuit and the drive circuit, simplifying the vehicle's circuit structure and reducing costs.

[0006] In some embodiments, the bridge circuit further includes a second AC connection configured to connect to a motor of the vehicle's suspension system. The controller is configured, in drive mode, to control the bridge circuit to convert the DC power from the power battery via the first DC connection into AC power, and then drive the motor via the second AC connection.

[0007] In some embodiments, the conversion circuit further includes a second DC connection terminal. The second DC connection terminal is configured to connect to a DC charging port of the vehicle. The controller is also configured, in DC charging mode, to control the bridge circuit to provide the DC voltage through the second DC connection terminal to the first DC connection terminal, and to charge the power battery through the first DC connection terminal.

[0008] In some embodiments, the first AC connection terminal includes a first phase connection terminal, a second phase connection terminal, and a third phase connection terminal. The first phase connection terminal is configured to connect to the first phase connection terminal of the AC charging port, the second phase connection terminal is configured to connect to the second phase connection terminal of the AC charging port, and the third phase connection terminal is configured to connect to the third phase connection terminal of the AC charging port. The bridge circuit includes a first bridge switch circuit, a second bridge switch circuit, and a third bridge switch circuit. The first bridge switch circuit connects the first phase connection terminal and the first DC connection terminal, the second bridge circuit connects the second phase connection terminal and the first DC connection terminal, and the third bridge circuit connects the third phase connection terminal and the first DC connection terminal. The AC charging mode includes a three-phase AC charging mode. The controller is configured to, in the three-phase AC charging mode, control the first bridge switch circuit to convert the AC power passing through the first phase connection terminal into DC power, control the second bridge switch circuit to convert the AC power passing through the second phase connection terminal into DC power, and control the third bridge switch circuit to convert the AC power passing through the third phase connection terminal into DC power, and charge the power battery through the first DC connection terminal.

[0009] In some embodiments, the bridge circuit further includes a first inductor, a second inductor, and a third inductor. The first bridge switching circuit is connected to the first phase connection terminal through the first inductor, the second bridge switching circuit is connected to the second phase connection terminal through the second inductor, and the third bridge switching circuit is connected to the third phase connection terminal through the third inductor.

[0010] In some embodiments, the first AC connection terminal includes a first single-phase connection terminal and a second single-phase connection terminal. The bridge circuit includes a fourth bridge switching circuit, a first switching circuit, and a second switching circuit. The first single-phase connection terminal is connected to the first single-phase connection terminal via the first switching circuit, the first single-phase connection terminal is connected to the third single-phase connection terminal via the second switching circuit, the first single-phase connection terminal is connected to the second single-phase connection terminal, and the fourth bridge switching circuit connects the second single-phase connection terminal and the first DC connection terminal. The AC charging mode includes a single-phase AC charging mode. The controller is configured to, in the single-phase AC charging mode, control the first and second switching circuits to close, and control the first, second, and third bridge switching circuits to convert the AC power through the first single-phase connection terminal into DC power, and control the fourth bridge switching circuit to convert the AC power through the second single-phase connection terminal into DC power, and charge the power battery through the first DC connection terminal.

[0011] In some embodiments, the second AC connection terminal includes a first drive connection terminal, a second drive connection terminal, a third drive connection terminal, and a fourth drive connection terminal. The first drive connection terminal is configured to connect to a first motor of the suspension system, the second drive connection terminal is configured to connect to a second motor of the suspension system, the third drive connection terminal is configured to connect to a third motor of the suspension system, and the fourth drive connection terminal is configured to connect to a fourth motor of the suspension system. A first bridge circuit is connected to the first drive connection terminal, a second bridge circuit is connected to the second drive connection terminal, a third bridge circuit is connected to the third drive connection terminal, and a fourth bridge circuit is connected to the fourth drive connection terminal. The controller is configured, in drive mode, to control the first bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the first motor through the first drive connection terminal, and / or to control the second bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the second motor through the second drive connection terminal, and / or to control the third bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the third motor through the third drive connection terminal, and / or to control the fourth bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the fourth motor through the fourth drive connection terminal.

[0012] In some embodiments, the bridge circuit includes a first bridge arm, a second bridge arm, and a third bridge arm, and the motor includes a first phase winding, a second phase winding, and a third phase winding. The first end of the first bridge arm, the first end of the second bridge arm, and the first end of the third bridge arm are connected to the first terminal of the power battery via the first terminal of the first DC connection. The second end of the first bridge arm, the second end of the second bridge arm, and the second end of the third bridge arm are connected to the second terminal of the power battery via the second terminal of the first DC connection. The midpoint of the first bridge arm is connected to the connection terminal of the vehicle's AC charging port via the first AC connection. The midpoint of the first bridge arm is connected to the first phase winding via the second AC connection. The midpoint of the second bridge arm is connected to the second phase winding via the second AC connection. The midpoint of the third bridge arm is connected to the third phase winding via the second AC connection.

[0013] In some embodiments, the first bridge arm includes a first switch and a second switch. A first terminal of the first switch is connected to a first terminal of the first DC connection. The second terminals of the first and second switches are connected at the midpoint of the first bridge arm, and the second terminal of the second switch is connected to the second terminal of the first DC connection. The second bridge arm includes a third switch and a fourth switch. The first terminal of the third switch is connected to a first terminal of the first DC connection. The second terminals of the third and fourth switches are connected at the midpoint of the second bridge arm, and the second terminal of the fourth switch is connected to the second terminal of the first DC connection. The third bridge arm includes a fifth switch and a sixth switch. The first terminal of the fifth switch is connected to a first terminal of the first DC connection. The second terminals of the fifth and sixth switches are connected at the midpoint of the third bridge arm, and the second terminal of the sixth switch is connected to the second terminal of the first DC connection.

[0014] In some embodiments, the conversion circuit further includes a transformer circuit connected to the first DC connection terminal and the power battery. The controller is configured to, in drive mode, control the transformer circuit to convert the voltage of the power battery into the voltage connected to the first DC connection terminal; the controller is also configured to, in AC charging mode or DC charging mode, control the transformer circuit to convert the voltage connected to the first DC connection terminal into the voltage of the power battery.

[0015] In some embodiments, the transformer circuit includes a first full-bridge circuit, a second full-bridge circuit, and a transformer. The first full-bridge circuit connects the first DC connection terminal to a first side of the transformer, and the second full-bridge circuit connects the power battery to a second side of the transformer.

[0016] In some embodiments, the first full-bridge circuit includes a fourth arm and a fifth arm. The first ends of the fourth and fifth arms are connected to the first terminal of the first DC connection. The second ends of the fourth and fifth arms are connected to the second terminal of the first DC connection. The midpoint of the fourth arm is connected to the same-name terminal on the first side of the transformer, and the midpoint of the fifth arm is connected to the opposite-name terminal on the first side of the transformer. The second full-bridge circuit includes a sixth arm and a seventh arm. The first ends of the sixth and seventh arms are connected to the first terminal of the power battery. The second ends of the sixth and seventh arms are connected to the second terminal of the power battery. The midpoint of the sixth arm is connected to the same-name terminal on the second side of the transformer, and the midpoint of the seventh arm is connected to the opposite-name terminal on the second side of the transformer.

[0017] In some embodiments, the transformer circuit further includes a first resonant circuit and a second resonant circuit, wherein the first resonant circuit is connected to the first full-bridge circuit and the first side of the transformer, and the second resonant circuit is connected to the second full-bridge circuit and the second side of the transformer.

[0018] In some embodiments, the first resonant circuit includes a first resonant capacitor and a first resonant inductor, the first resonant inductor and the first resonant capacitor being connected in series between the first full-bridge circuit and a first side of the transformer. The second resonant circuit includes a second resonant capacitor and a second resonant inductor, the second resonant inductor and the second resonant capacitor being connected in series between the second full-bridge circuit and a second side of the transformer.

[0019] In some embodiments, the transformer circuit includes a first bus capacitor and a second bus capacitor. The first terminal of the first bus capacitor is connected to the first terminal of the first DC connection terminal, the second terminal of the first bus capacitor is connected to the second terminal of the first DC connection terminal, the first terminal of the second bus capacitor is connected to the first terminal of the power battery, and the second terminal of the second bus capacitor is connected to the second terminal of the power battery.

[0020] The suspension system provided in this application includes a conversion circuit and a motor. In charging mode, the conversion circuit is configured to provide a charging voltage to charge the vehicle's power battery. In driving mode, the conversion circuit is configured to provide a driving voltage to drive the motor to adjust the vehicle's body height.

[0021] The vehicle provided in this application includes a conversion circuit and a power battery as provided in this application. In charging mode, the conversion circuit is configured to provide a charging voltage to charge the power battery.

[0022] In the vehicle conversion circuit, suspension system, and vehicle provided in this application embodiment, the conversion circuit can operate in either drive mode or AC charging mode. In drive mode, the bridge circuit and the power battery combine to form the motor drive circuit. The controller can control the bridge circuit to convert the DC power supplied by the power battery into AC power and drive the suspension system motor to adjust the vehicle height. In AC charging mode, the connection terminals of the AC charging port and the bridge circuit form the power battery charging circuit. The controller can control the bridge circuit to convert the AC power connected to the connection terminals of the AC charging port into DC power and charge the power battery. The conversion circuit enables the reuse of the charging circuit and drive circuit, simplifying the vehicle's circuit structure and reducing costs.

[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0025] Figure 1 This is a schematic diagram of a conversion circuit, suspension system, and vehicle provided in certain embodiments of this application;

[0026] Figure 2 This is a schematic diagram of a conversion circuit, suspension system, and vehicle provided in certain embodiments of this application;

[0027] Figure 3 This is a schematic diagram of a conversion circuit provided in some embodiments of this application;

[0028] Figure 4 This is a schematic diagram of a conversion circuit provided in some embodiments of this application;

[0029] Figure 5 This is a schematic diagram of a conversion circuit provided in some embodiments of this application;

[0030] Figure 6 This is a schematic diagram of a conversion circuit provided in some embodiments of this application;

[0031] Figure 7 This is a schematic diagram of a conversion circuit provided in some embodiments of this application;

[0032] Figure 8 This is a schematic diagram of a conversion circuit provided in some embodiments of this application;

[0033] Figure 9This is a schematic diagram of a conversion circuit provided in some embodiments of this application;

[0034] Figure 10 This is a schematic diagram of a conversion circuit provided in some embodiments of this application.

[0035] Reference numerals: Vehicle 10000, Suspension system 1000, Conversion circuit 1100, Motor 1200, Power battery 2000, Bridge circuit 100, Controller 200, Transformer circuit 300, First DC connection terminal 110, First AC connection terminal 120, First phase connection terminal 121, Second phase connection terminal 122, Third phase connection terminal 123, First single-phase connection terminal 124, Second single-phase connection terminal 125, Second AC connection terminal 130, First drive connection terminal 131. Second drive connection terminal; 132. Third drive connection terminal; 133. Fourth drive connection terminal; 134. Second DC connection terminal; 140. First bridge switch circuit; 151. Second bridge switch circuit; 152. Third bridge switch circuit; 153. Fourth bridge switch circuit; 154. First switch circuit; 161. Second switch circuit; 162. First full-bridge circuit; 310. Second full-bridge circuit; 320. Transformer; 330. First resonant circuit; 341. Second resonant circuit; 342. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are optional and are only used to explain the embodiments of this application, and should not be construed as limiting the embodiments of this application.

[0037] In related technologies, a vehicle's suspension system includes a power battery, a drive module, and a motor. The drive module includes an inverter circuit that converts the direct current (DC) from the power battery into alternating current (AC) to drive the motor and adjust the vehicle's ride height. On the other hand, the vehicle also includes a charging module, which includes a rectifier circuit that converts AC to DC to charge the power battery. The vehicle's circuitry is complex, with numerous components, resulting in high costs.

[0038] To address the aforementioned technical problems, this application provides a vehicle switching circuit, a vehicle suspension system, and a vehicle.

[0039] Reference Figure 1The conversion circuit 1100 provided in this application includes a bridge circuit 100 and a controller 200. The bridge circuit 100 includes a first DC connection terminal 110 and a first AC connection terminal 120. The first DC connection terminal 110 is configured to connect to the power battery 2000 of the vehicle 10000, and the first AC connection terminal 120 is configured to connect to the AC charging port of the vehicle 10000. The bridge circuit 100 is configured as the drive circuit of the suspension of the vehicle 10000.

[0040] The controller 200 is configured to control the bridge circuit 100 to convert the AC power through the first AC connection terminal 120 into DC power in AC charging mode, and to charge the power battery 2000 through the first DC connection terminal 110.

[0041] The suspension system 1000 provided in this application includes a conversion circuit 1100 and a motor 1200. In charging mode, the conversion circuit 1100 is configured to provide a charging voltage to charge the power battery 2000 of the vehicle 10000. In driving mode, the conversion circuit 1100 is configured to provide a driving voltage to drive the motor 1200 to adjust the vehicle height of the vehicle 10000.

[0042] The vehicle 10000 provided in this application embodiment includes a conversion circuit 1100 and a power battery 2000 provided in this application embodiment. In charging mode, the conversion circuit 1100 is configured to provide a charging voltage to charge the power battery 2000.

[0043] The conversion circuit 1100 provided in this embodiment can operate in either drive mode or AC charging mode. In drive mode, the bridge circuit 100 and the power battery 2000 are combined to form the drive circuit of the motor 1200. The controller 200 can control the bridge circuit 100 to convert the DC power provided by the power battery 2000 into AC power and drive the motor 1200 of the suspension system 1000 to adjust the vehicle height.

[0044] In AC charging mode, the connection terminals of the AC charging port and the bridge circuit 100 form the charging circuit for the power battery 2000. The controller 200 can control the bridge circuit 100 to convert the AC power connected to the connection terminals of the AC charging port into DC power and charge the power battery 2000. The conversion circuit 1100 can realize the reuse of the charging circuit and the drive circuit, simplifying the circuit structure of the vehicle 10000 and reducing costs.

[0045] Specifically, the switching devices in the bridge circuit 100 are connected in a bridge shape (for example, four switching devices are arranged in a shape where two diagonals intersect), and the controller 200 can realize inversion or conversion by controlling the switching devices in the bridge circuit 100.

[0046] The bridge circuit 100 is a circuit in the suspension system 1000. The bridge circuit 100 may include a first DC connection terminal 110 and a second AC connection terminal 130. The first DC connection terminal 110 can be connected to the power battery 2000. In drive mode, the bridge circuit 100 can serve as the drive circuit of the suspension, and the power battery 2000 provides drive voltage to the vehicle suspension through the bridge circuit 100.

[0047] The bridge circuit 100 may further include a first AC connection terminal 120. The first AC connection terminal 120 can be connected to the connection terminal of the AC charging port, and the first DC connection terminal 110 can be connected to the power battery 2000. The bridge circuit 100 can serve as a charging circuit for the power battery 2000. In AC charging mode, the bridge circuit 100 can access the AC power provided by the AC charging port through the first AC connection terminal 120, convert the AC power into DC power for the first DC connection terminal 110, and then charge the battery through the first DC connection terminal 110.

[0048] Thus, the conversion circuit 1100 provided in this embodiment can reuse the charging circuit and the driving circuit, simplifying the circuit structure of the vehicle 10000 and reducing costs.

[0049] In addition, the conversion circuit 1100 provided in this application embodiment is a circuit in the suspension system 1000. Since the power of the drive motor 1200 in the suspension system 1000 is close to the power required by the AC charging port in AC charging mode, the conversion circuit 1100 provided in this application embodiment has stronger adaptability by reusing the charging circuit and the drive circuit.

[0050] In some embodiments, the bridge circuit 100 further includes a second AC connection terminal 130, configured to connect to the motor 1200 of the suspension system 1000 of the vehicle 1000. The controller 200 is configured, in drive mode, to control the bridge circuit 100 to convert the DC power from the power battery 2000 through the first DC connection terminal 110 into AC power, and then drive the motor 1200 through the second AC connection terminal 130. The controller 200 is also configured, in AC charging mode, to control the bridge circuit 100 to convert the AC power through the first AC connection terminal 120 into DC power, and then charge the power battery 2000 through the first DC connection terminal 110.

[0051] In drive mode, bridge circuit 100 can be used as drive circuit for drive motor 1200. Bridge circuit 100 can be connected to the DC power of power battery 2000 through first DC connection terminal 110, and convert DC power into AC power to second AC connection terminal 130, and then drive motor 1200 through second AC connection terminal 130.

[0052] Reference Figure 2 In some embodiments, the conversion circuit 1100 further includes a second DC connection terminal 140. The second DC connection terminal 140 is configured as a connection terminal for connecting to the DC charging port of the vehicle 10000. The controller 200 is also configured, in DC charging mode, to control the bridge circuit 100 to provide the DC voltage through the second DC connection terminal 140 to the first DC connection terminal 110, and to charge the power battery 2000 through the first DC connection terminal 110.

[0053] Specifically, in DC charging mode, the controller 200 can also disconnect all the switching devices in the bridge circuit 100, so that the bridge circuit 100 provides DC power through the DC charging port connected to the second DC connection terminal 140, and provides the connected DC power to the first DC connection terminal 110, and then charges the battery through the first DC connection terminal 110.

[0054] Thus, the conversion circuit 1100 provided in this embodiment can also realize the DC charging function of the power battery 2000.

[0055] Reference Figure 3 as well as Figure 4 In some embodiments, the first AC connection terminal 120 includes a first phase connection terminal 121, a second phase connection terminal 122, and a third phase connection terminal 123. The first phase connection terminal 121 is configured to connect to the first phase connection terminal 121 sub-connected to the AC charging port, the second phase connection terminal 122 is configured to connect to the second phase connection terminal 122 sub-connected to the AC charging port, and the third phase connection terminal 123 is configured to connect to the third phase connection terminal 123 sub-connected to the AC charging port. The bridge circuit 100 includes a first bridge switching circuit 151, a second bridge switching circuit 152, and a third bridge switching circuit 153. The first bridge switching circuit 151 connects the first phase connection terminal 121 and the first DC connection terminal 110, the second bridge circuit 100 connects the second phase connection terminal 122 and the first DC connection terminal 110, and the third bridge circuit 100 connects the third phase connection terminal 123 and the first DC connection terminal 110. The AC charging mode includes a three-phase AC charging mode. The controller 200 is configured to, in the three-phase AC charging mode, control the first bridge switch circuit 151 to convert the AC power through the first phase connection terminal 121 into DC power, control the second bridge switch circuit 152 to convert the AC power through the second phase connection terminal 122 into DC power, and control the third bridge switch circuit 153 to convert the AC power through the third phase connection terminal 123 into DC power, and charge the power battery 2000 through the first DC connection terminal 110.

[0056] Specifically, the first phase connection terminal 121 can be set as connection terminal A1, the second phase connection terminal 122 can be set as connection terminal A2, and the third phase connection terminal 123 can be set as connection terminal A3.

[0057] In three-phase AC charging mode, the conversion circuit 1100 converts the input three-phase AC power into DC power and charges the power battery 2000 through the first DC connection terminal 110. Connection terminals A1, A2, and A3 are respectively connected to the three-phase AC power, with a phase difference of 120°. The controller 200 controls the switching devices in the first bridge switch circuit 151 based on the AC power input to connection terminal A1. The controller 200 controls the switching devices in the second bridge switch circuit 152 based on the AC power input to connection terminal A2. The controller 200 controls the switching devices in the third bridge switch circuit 153 based on the AC power input to connection terminal A3.

[0058] The controller 200 can control the switching devices in the first bridge switching circuit 151, the second bridge switching circuit 152 and the third bridge switching circuit 153 according to the three-phase PFC (Power Factor Correction) logic. The power factor of the three-phase power conversion is as close to 1 as possible, thereby reducing reactive power and reducing power conversion losses. It converts the three-phase AC power connected to the AC charging port into DC active power to charge the power battery 2000 as much as possible.

[0059] Reference Figure 3 as well as Figure 4 In some embodiments, the bridge circuit 100 further includes a first inductor, a second inductor, and a third inductor. The first bridge switching circuit 151 is connected to the first phase connection terminal 121 through the first inductor, the second bridge switching circuit 152 is connected to the second phase connection terminal 122 through the second inductor, and the third bridge switching circuit 153 is connected to the third phase connection terminal 123 through the third inductor.

[0060] Specifically, the first inductor can be inductor element L21, the second inductor can be inductor element L22, and the third inductor can be inductor element L23. Inductor element L21 can be connected to the first phase connection terminal 121 to improve the AC waveform connected to the first phase connection terminal 121, making the AC waveform closer to a sine wave. Inductor element L22 can be connected to the second phase connection terminal 122 to improve the AC waveform connected to the second phase connection terminal 122, making the AC waveform closer to a sine wave. Inductor element L23 can be connected to the third phase connection terminal 123 to improve the AC waveform connected to the third phase connection terminal 123, making the AC waveform closer to a sine wave. The AC waveforms connected to the first phase connection terminal 121, the second phase connection terminal 122, and the third phase connection terminal 123 are closer to a sine wave, thereby improving the power factor of the bridge circuit 100.

[0061] Reference Figure 5 as well as Figure 6 In some embodiments, the first AC connection terminal 120 includes a first single-phase connection terminal 124 and a second single-phase connection terminal 125. The bridge circuit 100 includes a fourth bridge switching circuit 154, a first switching circuit 161, and a second switching circuit 162. The first single-phase connection terminal 124 is connected to the first phase connection terminal 121 through the first switching circuit 161, the second single-phase connection terminal 124 is connected to the third phase connection terminal 123 through the second switching circuit 162, the first single-phase connection terminal 124 is connected to the second phase connection terminal 122, and the fourth bridge switching circuit 154 connects the second single-phase connection terminal 125 and the first DC connection terminal 110. The AC charging mode includes a single-phase AC charging mode. In the single-phase AC charging mode, the controller 200 is configured to control the first switch circuit 161 and the second switch circuit 162 to close, and to control the first bridge switch circuit 151, the second bridge switch circuit 152 and the third bridge switch circuit 153 to convert the AC power through the first single-phase connection terminal 124 into DC power, and to control the fourth bridge switch circuit 154 to convert the AC power through the second single-phase connection terminal 125 into DC power, and to charge the power battery 2000 through the first DC connection terminal 110.

[0062] Specifically, the first single-phase connection terminal 124 can be designated as connection terminal S1, the second single-phase connection terminal 125 can be designated as connection terminal S2, the first switching circuit 161 can include switching device SPST1, and the second switching circuit 162 can include switching device SPST2. Connection terminal S1 is connected to connection terminal A2, connection terminal S1 can be connected to connection terminal A1 through switching device SPST1, and connection terminal S3 can be connected to connection terminal A3 through switching device SPST2.

[0063] In drive mode, three-phase charging mode or DC charging mode, both switching devices SPST1 and SPST2 are disconnected.

[0064] In single-phase charging mode, both switching devices SPST1 and SPST2 are closed, so that connection terminal A1 is connected to connection terminals S1, S2 and S3. That is, connection terminal A1 can be connected in parallel with the first bridge switch circuit 151, the second bridge switch circuit 152 and the third bridge switch circuit 153 to form a three-phase interleaved totem pole bridgeless PFC circuit.

[0065] The controller 200 can control the first bridge switching circuit 151, the second bridge switching circuit 152, and the third bridge switching circuit 153 to alternately perform power conversion, meaning that multiple current channels are alternately switched on and off, thereby achieving a smoother current waveform and a higher power factor when the AC power connected to terminal S1 is converted. The controller 200 can also control the switching devices in the fourth bridge switching circuit 154 to convert the AC power connected to terminal S2 into DC power.

[0066] The controller 200 can control the switching devices in the first bridge switching circuit 151, the second bridge switching circuit 152, the third bridge switching circuit 153, and the fourth bridge switching circuit 154 according to PFC logic. The power factor of the three-phase power conversion is as close to 1 as possible, thereby reducing reactive power and reducing power conversion losses. It converts the three-phase AC power connected to the AC charging port into DC active power to charge the power battery 2000 as much as possible.

[0067] Thus, in single-phase charging mode, the conversion circuit 1100 can form a three-phase interleaved totem pole bridgeless PFC circuit, enabling the controller 200 to alternately convert power to the three bridge switching circuits, thereby improving the power factor of the conversion circuit 1100 during power conversion.

[0068] Reference Figure 7In some embodiments, the second AC connection terminal 130 includes a first drive connection terminal 131, a second drive connection terminal 132, a third drive connection terminal 133, and a fourth drive connection terminal 134. The first drive connection terminal 131 is configured to connect to a first motor of the suspension system 1000, the second drive connection terminal 132 is configured to connect to a second motor of the suspension system 1000, the third drive connection terminal 133 is configured to connect to a third motor of the suspension system 1000, and the fourth drive connection terminal 134 is configured to connect to a fourth motor of the suspension system 1000. A first bridge circuit 100 is connected to the first drive connection terminal 131, a second bridge circuit 100 is connected to the second drive connection terminal 132, a third bridge circuit 100 is connected to the third drive connection terminal 133, and a fourth bridge circuit 100 is connected to the fourth drive connection terminal 134. The controller 200 is configured, in drive mode, to control the first bridge switch circuit 151 to convert the DC power at the first DC connection terminal 110 into AC power and drive the first motor through the first drive connection terminal 131, and / or to control the second bridge switch circuit 152 to convert the DC power at the first DC connection terminal 110 into AC power and drive the second motor through the second drive connection terminal 132, and / or to control the third bridge switch circuit 153 to convert the DC power at the first DC connection terminal 110 into AC power and drive the third motor through the third drive connection terminal 133, and / or to control the fourth bridge switch circuit 154 to convert the DC power at the first DC connection terminal 110 into AC power and drive the fourth motor through the fourth drive connection terminal 134.

[0069] Specifically, the suspension system 1000 may include a first motor, a second motor, a third motor, and a fourth motor. A first bridge switch circuit 151 can drive the first motor through a first drive connection terminal 131. A second bridge switch circuit 152 can drive the first motor through a second drive connection terminal 132. A third bridge switch circuit 153 can drive the third motor through a third drive connection terminal 133. A fourth bridge switch circuit 154 can drive the fourth motor through a fourth drive connection terminal 134. In drive mode, the controller 200 can control any one or more bridge switch circuits to perform power conversion as needed to drive any one of the motors 1200.

[0070] In some embodiments, the first motor, the second motor, the third motor, and the fourth motor can be the motor 1200 of the chassis system. By driving the motor 1200, the gear pump can be rotated, and the rotation of the gear pump causes the oil to flow back and forth between the oil inlet and the oil outlet, flowing into the oil chamber of the shock absorber, thereby pushing the piston rod to move up and down to generate stroke.

[0071] The first, second, third, and fourth motors can serve as the power source for the suspension system 1000. Based on actual needs, each wheel of the vehicle 10000 requires a corresponding suspension drive motor 1200. Therefore, the first, second, third, and fourth motors can be configured to correspond to the four wheels of the vehicle 10000 (left front, left rear, right front, and right rear) respectively, to adjust the vertical movement of the suspension system 1000 along the Z-axis perpendicular to the ground. The maximum operating power of the first, second, third, and fourth motors is 8-20kW, the maximum operating voltage is above 800V, and the corresponding hydraulic pump operating pressure is between 0-20MPa. The suspension system 1000 also contains solenoid valves to regulate the operating pressure of the motors 1200.

[0072] In the suspension system 1000 provided in the embodiments of this application, the controller 200 can control the suspension chassis through the drive motor 1200 so as to adjust the suspension system 1000 to move up and down in the Z-axis direction perpendicular to the ground.

[0073] On roads with high damping, the first, second, third, and fourth motors can all enter a three-phase short-circuit mode. The controller 200 increases the resistance of the motor 1200, thereby increasing its ability to cope with bumpy roads and ensuring that the suspension system 1000 does not travel vertically due to bumps.

[0074] When significant road surface disturbances occur, such as when crossing speed bumps, the controller 200 can control the motor 1200 at the corresponding wheel position to respond. Upon crossing the speed bump, the wheel on the corresponding side will retract, bringing the vehicle body into a balanced position. During this process, the motor 1200 typically reverses direction, causing the hydraulic fluid to flow in the opposite direction, thereby depressing the shock absorber on that side.

[0075] When cornering at high speed, the vehicle body will have a steering angle due to the high speed. The inner side of the vehicle will be lower than the outer side. At this time, the inner motor needs to rotate forward 1200 times to make the shock absorber on that side travel upward, so that the side can be raised and the overall vehicle body can remain stable.

[0076] Four motors 1200 perform vector control to output corresponding torque, and the controller 200 dynamically adjusts the co-state variables according to road conditions to suit various road conditions, and optimizes torque distribution in real time to minimize the loss of the suspension system 1000.

[0077] In some embodiments, the bridge circuit 100 includes a first bridge arm, a second bridge arm, and a third bridge arm, and the motor 1200 includes a first phase winding, a second phase winding, and a third phase winding. The first end of the first bridge arm, the first end of the second bridge arm, and the first end of the third bridge arm are connected to the first terminal of the power battery 2000 via the first terminal of the first DC connection terminal 110. The second end of the first bridge arm, the second end of the second bridge arm, and the second end of the third bridge arm are connected to the second terminal of the power battery 2000 via the second terminal of the first DC connection terminal 110. The midpoint of the first bridge arm is connected to the connection terminal of the AC charging port of the vehicle 10000 via the first AC connection terminal 120. The midpoint of the first bridge arm is connected to the first phase winding via the second AC connection terminal 130. The midpoint of the second bridge arm is connected to the second phase winding via the second AC connection terminal 130. The midpoint of the third bridge arm is connected to the third phase winding via the second AC connection terminal 130.

[0078] Specifically, the first phase winding, the second phase winding, and the third phase winding can be three-phase windings within the motor 1200. In drive mode, each winding of the motor 1200 is connected to three phase currents with a phase difference of 120°. Due to the phase difference of the currents, the three-phase windings generate a rotating magnetic field that can drive the rotor of the motor 1200 to rotate, thus realizing the drive of the motor 1200.

[0079] The bridge circuit 100 may include a first bridge arm, a second bridge arm, and a third bridge arm. The controller 200 may control the switching of each switching device in the first bridge arm, the second bridge arm, and the third bridge arm with a phase difference of 120°, so that the phase difference of the AC current provided at the midpoint of the first bridge arm, the second bridge arm, and the third bridge arm is 120°.

[0080] by Figure 7 For example, the three-phase windings of the first motor may include L1, L2, and L3. In the first bridge switching circuit 151, the midpoint of the first bridge arm can be connected to L1, the midpoint of the second bridge arm can be connected to L2, and the midpoint of the third bridge arm can be connected to L3. The three-phase windings of the second motor may include L4, L5, and L6. In the second bridge switching circuit 152, the midpoint of the first bridge arm can be connected to L4, the midpoint of the second bridge arm can be connected to L5, and the midpoint of the third bridge arm can be connected to L6. The three-phase windings of the third motor may include L7, L8, and L9. In the third bridge switching circuit 153, the midpoint of the first bridge arm can be connected to L7, the midpoint of the second bridge arm can be connected to L8, and the midpoint of the third bridge arm can be connected to L9. The three-phase windings of the fourth motor may include L10, L11 and L12. In the fourth bridge switching circuit 154, the midpoint of the first bridge arm can be connected to L10, the midpoint of the second bridge arm can be connected to L11, and the midpoint of the third bridge arm can be connected to L12.

[0081] In some embodiments, the first bridge arm includes a first switch and a second switch. The first terminal of the first switch is connected to the first terminal of the first DC connection 110, the second terminals of the first and second switches are connected at the midpoint of the first bridge arm, and the second terminal of the second switch is connected to the second terminal of the first DC connection 110. The second bridge arm includes a third switch and a fourth switch. The first terminal of the third switch is connected to the first terminal of the first DC connection 110, the second terminals of the third and fourth switches are connected at the midpoint of the second bridge arm, and the second terminal of the fourth switch is connected to the second terminal of the first DC connection 110. The third bridge arm includes a fifth switch and a sixth switch. The first terminal of the fifth switch is connected to the first terminal of the first DC connection 110, the second terminals of the fifth and sixth switches are connected at the midpoint of the third bridge arm, and the second terminal of the sixth switch is connected to the second terminal of the first DC connection 110.

[0082] Specifically, in the first bridge switching circuit 151, the first bridge arm may include transistors Q1 and Q2, the second bridge arm may include transistors Q3 and Q4, and the third bridge arm may include transistors Q5 and Q6. The first terminals of transistors Q1, Q3, and Q5 are connected to the first terminal of the first DC connection 110. The second terminals of transistors Q2, Q4, and Q6 are connected to the second terminal of the first DC connection 110. L1 is connected to the second terminal of transistor Q1 and the first terminal of transistor Q2. L2 is connected to the second terminal of transistor Q3 and the first terminal of transistor Q4. L3 is connected to the second terminal of transistor Q5 and the first terminal of transistor Q6.

[0083] In the second bridge switching circuit 152, the first bridge arm may include transistors Q7 and Q8, the second bridge arm may include transistors Q9 and Q10, and the third bridge arm may include transistors Q11 and Q12. The first terminals of transistors Q7, Q9, and Q11 are connected to the first terminal of the first DC connection 110. The second terminals of transistors Q8, Q10, and Q12 are connected to the second terminal of the first DC connection 110. L4 is connected to the second terminal of transistor Q7 and the first terminal of transistor Q8. L5 is connected to the second terminal of transistor Q9 and the first terminal of transistor Q10. L6 is connected to the second terminal of transistor Q11 and the first terminal of transistor Q12.

[0084] In the third bridge switching circuit 153, the first bridge arm may include transistors Q13 and Q14, the second bridge arm may include transistors Q15 and Q16, and the third bridge arm may include transistors Q17 and Q18. The first terminals of transistors Q13, Q15, and Q17 are connected to the first terminal of the first DC connection 110. The second terminals of transistors Q14, Q16, and Q18 are connected to the second terminal of the first DC connection 110. L7 is connected to the second terminal of transistor Q13 and the first terminal of transistor Q14. L8 is connected to the second terminal of transistor Q15 and the first terminal of transistor Q16. L9 is connected to the second terminal of transistor Q17 and the first terminal of transistor Q18.

[0085] In the fourth bridge switching circuit 154, the first bridge arm may include transistors Q19 and Q20, the second bridge arm may include transistors Q21 and Q22, and the third bridge arm may include transistors Q23 and Q24. The first terminals of transistors Q19, Q21, and Q23 are connected to the first terminal of the first DC connection 110. The second terminals of transistors Q20, Q22, and Q24 are connected to the second terminal of the first DC connection 110. L10 is connected to the second terminal of transistor Q19 and the first terminal of transistor Q20. L11 is connected to the second terminal of transistor Q21 and the first terminal of transistor Q22. L12 is connected to the second terminal of transistor Q23 and the first terminal of transistor Q24.

[0086] Reference Figure 8 In some embodiments, the conversion circuit 1100 further includes a transformer circuit 300, which is connected to the first DC connection terminal 110 and the power battery 2000. The controller 200 is configured to, in drive mode, control the transformer circuit 300 to convert the voltage of the power battery 2000 into the voltage connected to the first DC connection terminal 110; the controller 200 is also configured to, in AC charging mode or DC charging mode, control the transformer circuit 300 to convert the voltage connected to the first DC connection terminal 110 into the voltage of the power battery 2000.

[0087] Specifically, the transformer circuit 300 can convert DC voltage. In drive mode, the controller 200 can control the transformer circuit 300 to convert the voltage of the power battery 2000 into a suitable DC voltage for the first DC connection terminal 110, so that the bridge circuit 100 can convert the DC voltage connected to the first DC connection terminal 110 into AC voltage to drive the motor 1200. In charging mode, the controller can control the transformer circuit 300 to convert the voltage connected to the first DC connection terminal 110 into a charging voltage to charge the power battery 2000.

[0088] Reference Figure 9 as well as Figure 10 In some embodiments, the transformer circuit 300 includes a first full-bridge circuit 310, a second full-bridge circuit 320, and a transformer 330. The first full-bridge circuit 310 connects the first DC connection terminal 110 to the first side of the transformer 330, and the second full-bridge circuit 320 connects the power battery 2000 to the second side of the transformer 330.

[0089] Specifically, the first full-bridge circuit 310 and the second full-bridge circuit 320 consist of four switching elements. These four switching elements can form a bridge-shaped structure. The order in which the four switching devices are turned on and off determines the direction of current and power transmission in the first full-bridge circuit 310 and the second full-bridge circuit 320. The controller 200 can control the on and off of each switching element in the first full-bridge circuit 310 and the second full-bridge circuit 320 to achieve voltage rise and fall transformations.

[0090] In charging mode, the DC voltage connected to the first DC connection terminal 110 is converted into a high-frequency AC signal by the first full-bridge circuit 310 and supplied to the first side of the transformer 330. When the high-frequency AC signal passes through the first side of the transformer 330, the transformer 330 can adjust the voltage (depending on the turns ratio of the first and second sides of the transformer 330). High-frequency AC allows for a smaller transformer 330 size. Since the volume and weight of the transformer 330 are inversely proportional to the frequency, the higher the frequency, the smaller and lighter the transformer 330 can be, thus reducing circuit costs.

[0091] The second side of transformer 330 can provide a high-frequency AC signal, which is then rectified by the other two switches of the second full-bridge circuit 320 and converted into DC voltage. Controller 200 can convert the voltage connected to the first DC connection terminal 110 into the charging voltage of the power battery 2000 by controlling the on / off state of each switching device in the first full-bridge circuit 310 and the second full-bridge circuit 320.

[0092] Similarly, in drive mode, the controller 200 can control the switching devices in the first full-bridge circuit 310 and the second full-bridge circuit 320 to switch the second full-bridge circuit 320 to convert DC to AC, and then control the first full-bridge circuit 310 to convert AC to DC, thus converting the voltage of the power battery 2000 into the DC voltage required by the first DC connection terminal 110.

[0093] Reference Figure 10In some embodiments, the first full-bridge circuit 310 includes a fourth bridge arm and a fifth bridge arm. The first ends of the fourth and fifth bridge arms are connected to the first terminal of the first DC connection terminal 110, and the second ends of the fourth and fifth bridge arms are connected to the second terminal of the first DC connection terminal 110. The midpoint of the fourth bridge arm is connected to the same-name terminal on the first side of the transformer 330, and the midpoint of the fifth bridge arm is connected to the opposite-name terminal on the first side of the transformer 330. The second full-bridge circuit 320 includes a sixth bridge arm and a seventh bridge arm. The first ends of the sixth and seventh bridge arms are connected to the first terminal of the power battery 2000, and the second ends of the sixth and seventh bridge arms are connected to the second terminal of the power battery 2000. The midpoint of the sixth bridge arm is connected to the same-name terminal on the second side of the transformer 330, and the midpoint of the seventh bridge arm is connected to the opposite-name terminal on the second side of the transformer 330.

[0094] Specifically, the fourth bridge arm may include transistors Q31 and Q32, and the fifth bridge arm may include transistors Q33 and Q34. The first terminals of transistors Q31 and Q33 are connected to the first terminal of the first DC connection 110. The second terminals of transistors Q32 and Q34 are connected to the second terminal of the first DC connection 110. The first terminals of transistors Q31 and Q32 are connected to the same-named terminals on the first side of the transformer 330, and the first terminals of transistors Q33 and Q34 are connected to the opposite-named terminals on the first side of the transformer 330. The controller 200 can control the switching on and off of transistors Q31, Q32, Q33, and Q34 to control the first full-bridge circuit 310 to perform power conversion.

[0095] The fifth bridge arm may include transistors Q35 and Q36, and the sixth bridge arm may include transistors Q37 and Q38. The first terminals of transistors Q35 and Q37 are connected to the first terminal of the power battery 2000, the second terminals of transistors Q36 and Q38 are connected to the second terminal of the power battery 2000, the first terminals of transistors Q35 and Q36 are connected to the same-named terminals on the second side of the transformer 330, and the first terminals of transistors Q37 and Q38 are connected to the opposite-named terminals on the second side of the transformer 330. The controller 200 can control the switching on and off of transistors Q35, Q36, Q37, and Q38 to control the second full-bridge circuit 320 for power conversion.

[0096] Reference Figure 9 or Figure 10In some embodiments, the transformer circuit 300 further includes a first resonant circuit 341 and a second resonant circuit 342. The first resonant circuit 341 is connected to the first full-bridge circuit 310 and the first side of the transformer 330, and the second resonant circuit 342 is connected to the second full-bridge circuit 320 and the second side of the transformer 330.

[0097] Specifically, in transformer 330, the first side is connected in series with the first resonant circuit 341, and the second side is connected in series with the second resonant circuit 342, so that transformer 330 can work at the resonant point, thereby improving the efficiency of transformer 330 in transmitting electrical energy.

[0098] In some embodiments, the first resonant circuit 341 includes a first resonant capacitor and a first resonant inductor, which are connected in series between the first full-bridge circuit 310 and the first side of the transformer 330. The second resonant circuit 342 includes a second resonant capacitor and a second resonant inductor, which are connected in series between the second full-bridge circuit 320 and the second side of the transformer 330.

[0099] Specifically, the first resonant capacitor can be a capacitor element C31, the first resonant inductor can be an inductor element L31, the second resonant capacitor can be a capacitor element C32, and the second resonant inductor can be an inductor element L32.

[0100] The first terminal of transistor Q31 and the second terminal of transistor Q32 can be connected to the corresponding terminals on the first side of transformer 330 via inductor L31 and capacitor C31. The first terminal of transistor Q35 and the second terminal of transistor Q36 can be connected to the corresponding terminals on the second side of transformer 330 via inductor L32 and capacitor C32.

[0101] At the resonant frequency, the first resonant inductor and the first resonant capacitor in the first resonant circuit 341 compensate for each other (the inductive reactance and the capacitive reactance are equal and opposite in direction), and the second resonant inductor and the second resonant capacitor in the second resonant circuit 342 compensate for each other, thereby minimizing the total impedance of the transformer 330 and improving the efficiency of the transformer 330 in transmitting electrical energy.

[0102] Reference Figure 9 or Figure 10 In some embodiments, the transformer circuit 300 includes a first bus capacitor and a second bus capacitor. The first terminal of the first bus capacitor is connected to the first terminal of the first DC connection terminal 110, the second terminal of the first bus capacitor is connected to the second terminal of the first DC connection terminal 110, the first terminal of the second bus capacitor is connected to the first terminal of the power battery 2000, and the second terminal of the second bus capacitor is connected to the second terminal of the power battery 2000.

[0103] Specifically, the first bus capacitor may include capacitor element C1, and the second bus capacitor may include capacitor element C2. The first terminal of capacitor element C1 may be connected to the positive terminal of the first DC connection terminal 110, and the second terminal of capacitor element C1 may be connected to the negative terminal of the first DC connection terminal 110. The first terminal of capacitor element C2 may be connected to the positive terminal of the power battery 2000, and the second terminal of capacitor element C2 may be connected to the negative terminal of the power battery 2000.

[0104] Bus capacitors smooth the incoming DC power, reducing DC fluctuations and thus ensuring a more stable output AC power. Furthermore, when AC power changes, bus capacitors stabilize the AC output by storing and releasing charge.

[0105] In charging mode, capacitor C1 makes the DC current connected to the first DC connection terminal 110 smoother. In driving mode, capacitor C2 makes the DC current connected to the power battery 2000 smoother.

[0106] In the description of this specification, the references to terms such as "some embodiments," "in one example," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0107] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the function involved, as will be understood by those skilled in the art to which embodiments of this application pertain.

[0108] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are optional and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A conversion circuit for a vehicle, characterized in that, The conversion circuit includes: A bridge circuit, the bridge circuit including a first DC connection terminal and a first AC connection terminal, the first DC connection terminal being configured to connect to the power battery of the vehicle, the first AC connection terminal being configured to connect to the AC charging port of the vehicle, and the bridge circuit being configured as a drive circuit of the vehicle suspension. The controller is configured to, in AC charging mode, control the bridge circuit to convert AC power through the first AC connection terminal into DC power, and to charge the power battery through the first DC connection terminal.

2. The conversion circuit according to claim 1, characterized in that, The bridge circuit also includes a second AC connection terminal configured to connect to the motor of the vehicle's suspension system; The controller is configured, in drive mode, to control the bridge circuit to convert the DC power from the power battery through the first DC connection terminal into AC power, and then drive the motor through the second AC connection terminal.

3. The conversion circuit according to claim 1, characterized in that, The bridge circuit includes a second DC connection terminal, which is configured as a connection terminal for connecting to the DC charging port of the vehicle. The controller is also configured, in DC charging mode, to control the bridge circuit to provide the DC voltage through the second DC connection terminal to the first DC connection terminal, and to charge the power battery through the first DC connection terminal.

4. The conversion circuit according to claim 1, characterized in that, The first AC connection terminal includes a first phase connection terminal, a second phase connection terminal, and a third phase connection terminal. The first phase connection terminal is configured to connect to the first phase connection terminal of the AC charging port, the second phase connection terminal is configured to connect to the second phase connection terminal of the AC charging port, and the third phase connection terminal is configured to connect to the third phase connection terminal of the AC charging port. The bridge circuit includes a first bridge switch circuit, a second bridge switch circuit, and a third bridge switch circuit. The first bridge switch circuit is connected to the first phase connection terminal and the first DC connection terminal. The second bridge circuit is connected to the second phase connection terminal and the first DC connection terminal. The third bridge circuit is connected to the third phase connection terminal and the first DC connection terminal. The AC charging mode includes a three-phase AC charging mode. The controller is configured to, in the three-phase AC charging mode, control the first bridge switch circuit to convert the AC power through the first phase connection terminal into DC power, control the second bridge switch circuit to convert the AC power through the second phase connection terminal into DC power, and control the third bridge switch circuit to convert the AC power through the third phase connection terminal into DC power, and charge the power battery through the first DC connection terminal.

5. The conversion circuit according to claim 4, characterized in that, The bridge circuit further includes a first inductor, a second inductor, and a third inductor. The first bridge switching circuit is connected to the first phase connection terminal through the first inductor, the second bridge switching circuit is connected to the second phase connection terminal through the second inductor, and the third bridge switching circuit is connected to the third phase connection terminal through the third inductor.

6. The conversion circuit according to claim 4, characterized in that, The first AC connection terminal includes a first single-phase connection terminal and a second single-phase connection terminal; The bridge circuit includes a fourth bridge switching circuit, a first switching circuit, and a second switching circuit. The first single-phase connection terminal is connected to the first phase connection terminal through the first switching circuit, the second single-phase connection terminal is connected to the third phase connection terminal through the second switching circuit, the first single-phase connection terminal is connected to the second phase connection terminal, and the fourth bridge switching circuit is connected to the second single-phase connection terminal and the first DC connection terminal. The AC charging mode includes a single-phase AC charging mode. The controller is configured to, in the single-phase AC charging mode, control the first switch circuit and the second switch circuit to close, and control the first bridge switch circuit, the second bridge switch circuit and the third bridge switch circuit to convert the AC power through the first single-phase connection terminal into DC power, and control the fourth bridge switch circuit to convert the AC power through the second single-phase connection terminal into DC power, and charge the power battery through the first DC connection terminal.

7. The conversion circuit according to claim 6, characterized in that, The bridge circuit further includes a second AC connection terminal, which is configured to connect to the motor of the vehicle's suspension system. The controller is configured to, in drive mode, control the bridge circuit to convert the DC power from the power battery through the first DC connection terminal into AC power, and drive the motor through the second AC connection terminal. The second AC connection terminal includes a first drive connection terminal, a second drive connection terminal, a third drive connection terminal, and a fourth drive connection terminal. The suspension system includes a first motor, a second motor, a third motor, and a fourth motor. The first drive connection terminal is configured to connect to the first motor of the suspension system, the second drive connection terminal is configured to connect to the second motor of the suspension system, the third drive connection terminal is configured to connect to the third motor of the suspension system, and the fourth drive connection terminal is configured to connect to the fourth motor of the suspension system. The first bridge circuit is connected to the first drive connection terminal, the second bridge circuit is connected to the second drive connection terminal, the third bridge circuit is connected to the third drive connection terminal, and the fourth bridge circuit is connected to the fourth drive connection terminal. The controller is configured, in drive mode, to control the first bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the first motor through the first drive connection terminal, and / or to control the second bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the second motor through the second drive connection terminal, and / or to control the third bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the third motor through the third drive connection terminal, and / or to control the fourth bridge switch circuit to convert the DC power at the first DC connection terminal into AC power and drive the fourth motor through the fourth drive connection terminal.

8. The conversion circuit according to claim 1, characterized in that, The bridge circuit further includes a second AC connection terminal, which is configured to connect to the motor of the vehicle's suspension system. The controller is configured to, in drive mode, control the bridge circuit to convert the DC power from the power battery through the first DC connection terminal into AC power, and drive the motor through the second AC connection terminal. The bridge circuit includes a first bridge arm, a second bridge arm, and a third bridge arm. The motor of the vehicle's suspension system includes a first phase winding, a second phase winding, and a third phase winding. The first end of the first bridge arm, the first end of the second bridge arm, and the first end of the third bridge arm are connected to the first terminal of the power battery through the first terminal of the first DC connection terminal, and the second end of the first bridge arm, the second end of the second bridge arm, and the second end of the third bridge arm are connected to the second terminal of the power battery through the second terminal of the first DC connection terminal. The midpoint of the first bridge arm is connected to the connection terminal of the AC charging port of the vehicle through the first AC connection terminal. The midpoint of the first bridge arm is connected to the first phase winding through the second AC connection terminal. The midpoint of the second bridge arm is connected to the second phase winding through the second AC connection terminal. The midpoint of the third bridge arm is connected to the third phase winding through the second AC connection terminal.

9. The conversion circuit according to claim 8, characterized in that, The first bridge arm includes a first switch and a second switch. The first terminal of the first switch is connected to the first terminal of the first DC connection. The second terminal of the first switch and the first terminal of the second switch are connected at the midpoint of the first bridge arm. The second terminal of the second switch is connected to the second terminal of the first DC connection. The second bridge arm includes a third switch and a fourth switch. The first terminal of the third switch is connected to the first terminal of the first DC connection. The second terminal of the third switch and the first terminal of the fourth switch are connected at the midpoint of the second bridge arm. The second terminal of the fourth switch is connected to the second terminal of the first DC connection. The third bridge arm includes a fifth switch and a sixth switch. The first terminal of the fifth switch is connected to the first terminal of the first DC connection. The second terminal of the fifth switch and the first terminal of the sixth switch are connected at the midpoint of the third bridge arm. The second terminal of the sixth switch is connected to the second terminal of the first DC connection.

10. The conversion circuit according to claim 1, characterized in that, The conversion circuit also includes a transformer circuit, and the first DC connection terminal is electrically connected to the power battery through the transformer circuit. The controller is configured to, in drive mode, control the transformer circuit to convert the voltage of the power battery into the voltage connected to the first DC connection terminal, and the controller is configured to, in AC charging mode or DC charging mode, control the transformer circuit to convert the voltage connected to the first DC connection terminal into the voltage of the power battery.

11. The conversion circuit according to claim 10, characterized in that, The transformer circuit includes a transformer, a first full-bridge circuit, and a second full-bridge circuit. The first full-bridge circuit connects the first DC connection terminal to the first side of the transformer, and the second full-bridge circuit connects the power battery to the second side of the transformer.

12. The conversion circuit according to claim 11, characterized in that, The first full-bridge circuit includes a fourth bridge arm and a fifth bridge arm. The first end of the fourth bridge arm and the first end of the fifth bridge arm are connected to the first pole of the first DC connection terminal. The second end of the fourth bridge arm and the second end of the fifth bridge arm are connected to the second pole of the first DC connection terminal. The midpoint of the fourth bridge arm is connected to the same-name terminal on the first side of the transformer, and the midpoint of the fifth bridge arm is connected to the opposite-name terminal on the first side of the transformer. The second full-bridge circuit includes a sixth bridge arm and a seventh bridge arm. The first end of the sixth bridge arm and the first end of the seventh bridge arm are connected to the first terminal of the power battery. The second end of the sixth bridge arm and the second end of the seventh bridge arm are connected to the second terminal of the power battery. The midpoint of the sixth bridge arm is connected to the same-name terminal on the second side of the transformer, and the midpoint of the seventh bridge arm is connected to the opposite-name terminal on the second side of the transformer.

13. The conversion circuit according to claim 11, characterized in that, The transformer circuit further includes a first resonant circuit and a second resonant circuit. The first resonant circuit is connected to the first full-bridge circuit and the first side of the transformer, and the second resonant circuit is connected to the second full-bridge circuit and the second side of the transformer.

14. The conversion circuit according to claim 13, characterized in that, The first resonant circuit includes a first resonant capacitor and a first resonant inductor, and the first resonant inductor and the first resonant capacitor are connected in series between the first full-bridge circuit and the first side of the transformer; The second resonant circuit includes a second resonant capacitor and a second resonant inductor, which are connected in series between the second full-bridge circuit and the second side of the transformer.

15. The conversion circuit according to claim 11, characterized in that, The transformer circuit includes a first bus capacitor and a second bus capacitor. The first terminal of the first bus capacitor is connected to the first terminal of the first DC connection terminal, the second terminal of the first bus capacitor is connected to the second terminal of the first DC connection terminal, the first terminal of the second bus capacitor is connected to the first terminal of the power battery, and the second terminal of the second bus capacitor is connected to the second terminal of the power battery.

16. The conversion circuit according to claim 1, characterized in that, The bridge circuit includes a second DC connection terminal, which is configured as a connection terminal for connecting to the DC charging port of the vehicle. The controller is also configured, in DC charging mode, to control the bridge circuit to provide the DC voltage through the second DC connection terminal to the first DC connection terminal, and to charge the power battery through the first DC connection terminal.

17. A vehicle suspension system, characterized in that, The suspension system includes: The conversion circuit according to any one of claims 1-16, in charging mode, is configured to provide a charging voltage to charge the vehicle's power battery; In drive mode, the conversion circuit is configured to provide drive voltage to drive the motor in order to adjust the vehicle's body height.

18. A vehicle, characterized in that, The vehicles include: The conversion circuit according to any one of claims 1-16 or the suspension system according to claim 17; In charging mode, the conversion circuit is configured to provide a charging voltage to charge the power battery.

Images