Vehicle-mounted power supply device, mobile device, vehicle-mounted power supply system, and control method

Abstract

This application discloses an on-board power supply device, a mobile device, an on-board power supply system, and a control method. The on-board power supply device includes a wireless charging receiving circuit and a first half-bridge circuit, the wireless charging receiving circuit being connected to the first half-bridge circuit. The wireless charging receiving circuit includes a first rectifier circuit, which in turn includes a second half-bridge circuit and a third half-bridge circuit. The output terminals of the second and third half-bridge circuits are respectively connected to the output terminal of the first half-bridge circuit. The first half-bridge circuit, by sharing the second half-bridge circuit in the first rectifier circuit, achieves the function of inverting high-voltage direct current into alternating current, i.e., an inverter circuit. This eliminates the need for one half-bridge circuit and the driving circuit that drives it. Consequently, the size of the on-board power supply device can be reduced, facilitating miniaturization and lowering its cost.

Description

Technical Field

[0001] This application relates to electronic circuit technology, and includes, but is not limited to, an on-board power supply device, a mobile device, an on-board power supply system, and a control method. Background Technology

[0002] A DC-DC converter (DCDC) is a crucial component of the electrical system of an electric vehicle. It converts the high-voltage DC power output from the high-voltage battery into a low-voltage DC power, such as 12V, to charge the low-voltage battery or low-voltage loads in the electric vehicle. With the increasing development and refinement of wireless charging technology, wireless charging systems for electric vehicles are becoming more widespread. Wireless charging systems convert AC power into high-voltage DC power via wireless power transmission to charge the high-voltage battery.

[0003] Therefore, in order to meet the charging needs of both high-voltage and low-voltage batteries, traditional vehicle power systems typically provide electric vehicles with separate wireless power transfer (WPT) subsystems and on-board DC-DC subsystems.

[0004] However, since the WPT subsystem and the vehicle DC-DC subsystem are two independent systems, the cost of the vehicle power system is high and its size is large, which is not conducive to reducing the size of the vehicle power system. Summary of the Invention

[0005] In view of this, the vehicle power supply device, mobile device, vehicle power supply system, and control method provided in the embodiments of this application can reduce the cost and size of the vehicle power supply device, thus facilitating its miniaturization. The vehicle power supply device, mobile device, vehicle power supply system, and control method provided in the embodiments of this application are implemented as follows: The vehicle power supply device provided in this application embodiment includes: a wireless charging receiving circuit and a first half-bridge circuit; the wireless charging receiving circuit is connected to the first half-bridge circuit. The wireless charging receiving circuit includes a first rectifier circuit; the first rectifier circuit includes a second half-bridge circuit and a third half-bridge circuit. The output terminals of the second half-bridge circuit and the third half-bridge circuit are respectively connected to the output terminal of the first half-bridge circuit; The wireless charging receiving circuit is configured to be coupled to the wireless charging pile via electromagnetic induction, receive the electrical energy transmitted by the wireless charging pile, and convert it into high-voltage direct current. The high-voltage direct current is used to charge the high-voltage battery in the mobile device. The first half-bridge circuit and the second half-bridge circuit are configured to receive the high-voltage direct current and invert the high-voltage direct current into alternating current, which is used to charge the low-voltage battery in the mobile device when converted into low-voltage direct current.

[0006] In some possible embodiments, when both the high-voltage battery and the low-voltage battery are in a charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in an operating state; wherein, in the operating state, the first power transistor and the second power transistor in each of the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are complementaryly turned on. When the high-voltage battery is in the charging state and the low-voltage battery is in the non-charging state, both the second half-bridge circuit and the third half-bridge circuit are in the operating state, and the first half-bridge circuit is in the non-operating state; wherein, in the non-operating state, both the first power transistor and the second power transistor are in the off state. When the high-voltage battery is in the non-charging state and the low-voltage battery is in the charging state, the first half-bridge circuit and the second half-bridge circuit are both in the working state, and the third half-bridge circuit is in the non-working state. When both the high-voltage battery and the low-voltage battery are in the non-charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in the non-operating state.

[0007] In some possible embodiments, the on-board power supply device further includes: a transformer; The primary side of the transformer is connected to the midpoint of the first half-bridge circuit and the midpoint of the second half-bridge circuit, respectively. The transformer is configured to transmit the AC power to the secondary side of the transformer when the high-voltage direct current is inverted into the AC power through the first half-bridge circuit and the second half-bridge circuit.

[0008] In some possible embodiments, the vehicle power supply device further includes: a rectifier and filter circuit; The input terminal of the rectifier and filter circuit is connected to the secondary side of the transformer, and the output terminal of the rectifier and filter circuit and the secondary side of the transformer are both connected to the low-voltage battery. The rectifier and filter circuit is configured to rectify and filter the AC power into the low-voltage DC power.

[0009] In some possible embodiments, the rectifier-filter circuit includes: a second rectifier circuit and a first filter circuit; the input terminal of the second rectifier circuit is the input terminal of the rectifier-filter circuit, and the output terminal of the first filter circuit is the output terminal of the rectifier-filter circuit. The input terminal of the second rectifier circuit is connected to the secondary side of the transformer, the output terminal of the second rectifier circuit is connected to the input terminal of the first filter circuit, and the output terminal of the first filter circuit is connected to the low-voltage battery. The second rectifier circuit is configured to rectify the AC power into rectified AC power; The first filter circuit is configured to filter the rectified AC power into the low-voltage DC power.

[0010] In some possible embodiments, the second rectifier circuit includes: a first diode and a second diode; the anodes of the first diode and the second diode are both input terminals of the second rectifier circuit, and the cathodes of the first diode and the second diode are both output terminals of the second rectifier circuit. The positive terminals of the first diode and the second diode are both connected to the secondary side of the transformer, and the negative terminals of the first diode and the second diode are both connected to the input terminal of the first filter circuit.

[0011] In some possible embodiments, the first filter circuit includes: a first inductor, a first capacitor, and a first resistor; the first end of the first inductor is the input terminal of the first filter circuit, and the second end of the first inductor, the first end of the first resistor, and the second plate of the first capacitor are all output terminals of the first filter circuit. The first end of the first inductor is connected to the output end of the second rectifier circuit, and the second end of the first inductor, the first end of the first resistor, and the second plate of the first capacitor are all connected to the low-voltage battery. The second end of the first resistor is connected to the first plate of the first capacitor.

[0012] In some possible embodiments, each of the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit includes: the first power transistor and the second power transistor; The drain terminal of the first power transistor is the positive output terminal of the half-bridge circuit, and the source terminal of the second power transistor is the negative output terminal of the half-bridge circuit. The source terminal of the first power transistor and the drain terminal of the second power transistor are connected. The midpoint of the half-bridge circuit is located between the source terminal of the first power transistor and the drain terminal of the second power transistor. The gate terminals of both the first and second power transistors are connected to a first control signal. The first control signal is used to control the power transistors to turn on or off. The output terminals of the half-bridge circuit include the positive output terminal and the negative output terminal of the half-bridge circuit.

[0013] In some possible embodiments, the wireless charging receiving circuit further includes: a receiving coil and a resonant circuit; The receiving coil is connected to the resonant circuit, and the resonant circuit is also connected to the input terminal of the first rectifier circuit. The receiving coil is configured to be coupled to the wireless charging pile via electromagnetic induction to receive electrical energy transmitted by the wireless charging pile. The resonant circuit is configured to compensate for the electrical energy transmitted by the wireless charging pile to obtain high-frequency AC power, and transmit the high-frequency AC power to the first rectifier circuit to rectify the high-frequency AC power to obtain rectified high-frequency AC power.

[0014] In some possible embodiments, the resonant circuit includes: a second inductor, a second capacitor, and a third capacitor; The first plate of the second capacitor is connected to the receiving coil, the second plate of the second capacitor is connected to the first end of the second inductor and the first plate of the third capacitor, and the second end of the second inductor and the second plate of the third capacitor are both connected to the input terminal of the first rectifier circuit.

[0015] In some possible embodiments, the wireless charging receiving circuit further includes: a second filtering circuit; The input terminal of the second filter circuit is connected to the output terminal of the first rectifier circuit, and the output terminal of the second filter circuit is connected to the high-voltage battery. The second filter circuit is configured to filter the rectified high-frequency AC power to obtain the high-voltage DC power.

[0016] In some possible embodiments, the second filter circuit includes: a third inductor, a fourth capacitor, and a fifth capacitor; the first terminal of the third inductor, the first plate of the fourth capacitor, the second plate of the fourth capacitor, and the second plate of the fifth capacitor are all input terminals of the second filter circuit, and the second terminal of the third inductor and the first plate of the fifth capacitor are both output terminals of the second filter circuit. The first terminal of the third inductor, the first plate of the fourth capacitor, the second plate of the fourth capacitor, and the second plate of the fifth capacitor are all connected to the output terminal of the first rectifier circuit, and the second terminal of the third inductor and the first plate of the fifth capacitor are all connected to the high-voltage battery.

[0017] The mobile device provided in this application includes: a high-voltage battery, a low-voltage battery, and an on-board power supply device provided in this application. Both the high-voltage battery and the low-voltage battery are connected to the vehicle power supply device. The on-board power supply is configured to charge the high-voltage battery and the low-voltage battery respectively.

[0018] The vehicle power system provided in this application includes a wireless charging pile and a vehicle power device provided in this application. The wireless charging station is configured to transmit wireless power to the vehicle power supply unit via electromagnetic induction coupling.

[0019] The control method provided in this application embodiment is applied to the vehicle power supply device provided in this application embodiment, and the method includes: The wireless charging receiving circuit is coupled to the wireless charging pile through electromagnetic induction, receives the electrical energy transmitted by the wireless charging pile, and converts it into high-voltage direct current. The high-voltage direct current is used to charge the high-voltage battery in the mobile device. The first half-bridge circuit and the second half-bridge circuit receive the high-voltage direct current and invert the high-voltage direct current into alternating current. The alternating current is used to charge the low-voltage battery in the mobile device when it is converted into low-voltage direct current.

[0020] In some possible embodiments, the method further includes: When both the high-voltage battery and the low-voltage battery are in a charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in a working state; wherein, in the working state, the first power transistor and the second power transistor in each of the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are complementaryly turned on. When the high-voltage battery is in the charging state and the low-voltage battery is in the non-charging state, both the second half-bridge circuit and the third half-bridge circuit are in the operating state, and the first half-bridge circuit is in the non-operating state; wherein, in the non-operating state, both the first power transistor and the second power transistor are in the off state. When the high-voltage battery is in the non-charging state and the low-voltage battery is in the charging state, the first half-bridge circuit and the second half-bridge circuit are both in the working state, and the third half-bridge circuit is in the non-working state. When both the high-voltage battery and the low-voltage battery are in the non-charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in the non-operating state.

[0021] In some possible embodiments, the method further includes: When both the high-voltage battery and the low-voltage battery are in the charging state, the magnitude of the low-voltage DC current is controlled by controlling the duration for which the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit are simultaneously turned on, and the magnitude of the high-voltage DC current is controlled by controlling the duration for which the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit are simultaneously turned on. When the high-voltage battery is in the charging state and the low-voltage battery is in the non-charging state, the magnitude of the high-voltage direct current is controlled by controlling the duration for which the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit are simultaneously turned on. When the high-voltage battery is in the non-charging state and the low-voltage battery is in the charging state, the magnitude of the low-voltage DC current is controlled by controlling the duration for which the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit are simultaneously turned on.

[0022] This application provides an on-board power supply device, a mobile device, an on-board power system, and a control method. The on-board power supply device includes: a wireless charging receiving circuit and a first half-bridge circuit; the wireless charging receiving circuit is connected to the first half-bridge circuit; the wireless charging receiving circuit includes a first rectifier circuit, which in turn includes a second half-bridge circuit and a third half-bridge circuit; the output terminals of the second and third half-bridge circuits are respectively connected to the output terminal of the first half-bridge circuit; the wireless charging receiving circuit is configured to be electromagnetically coupled to a wireless charging pile, receive electrical energy transmitted from the wireless charging pile, and convert it into high-voltage direct current (DC), which is used to charge a high-voltage battery in the mobile device; the second and third half-bridge circuits are configured to receive the DC and invert it into alternating current (AC), which is used to charge a low-voltage battery in the mobile device after being converted to low-voltage DC.

[0023] As can be seen from the above, the first half-bridge circuit achieves the function of inverting high-voltage DC power into AC power by sharing the second half-bridge circuit in the first rectifier circuit, i.e., the function of an inverter circuit. Thus, one half-bridge circuit and the drive circuit for driving that half-bridge circuit can be eliminated in the vehicle power supply device. This reduces the size of the vehicle power supply device, facilitating miniaturization and lowering its cost. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with this application and, together with the specification, serve to explain the technical solutions of this application.

[0025] Figure 1 This is a schematic diagram of a traditional vehicle power supply system. Figure 2 This is a schematic diagram of the structure of an on-board power supply device provided in an embodiment of this application; Figure 3 This is a schematic diagram of another vehicle-mounted power supply device provided in an embodiment of this application; Figure 4 A schematic diagram of the structure of another vehicle-mounted power supply device provided in the embodiments of this application; Figure 5 A schematic diagram of the structure of another vehicle-mounted power supply device provided in the embodiments of this application; Figure 6 This is a schematic diagram of the structure of a rectifier filter circuit provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of a second rectifier circuit provided in an embodiment of this application; Figure 8 This is a schematic diagram of another second rectifier circuit provided in an embodiment of this application; Figure 9 This is a schematic diagram of the structure of a first filter circuit provided in an embodiment of this application; Figure 10 This is a schematic diagram of a half-bridge circuit provided in an embodiment of this application; Figure 11 This is a schematic diagram of the structure of a wireless charging receiver circuit provided in an embodiment of this application; Figure 12 This is a schematic diagram of the structure of a resonant circuit provided in an embodiment of this application; Figure 13 This is a schematic diagram of another wireless charging receiving circuit provided in an embodiment of this application; Figure 14 This is a schematic diagram of the structure of a second filter circuit provided in an embodiment of this application; Figure 15This is a schematic diagram of another vehicle-mounted power supply device provided in an embodiment of this application; Figure 16 A schematic diagram of the energy flow of the vehicle power supply device provided in an embodiment of this application in one application scenario; Figure 17 A waveform diagram of the first control signal provided in an embodiment of this application in an application scenario; Figure 18 A schematic diagram of the energy flow of the vehicle power supply device provided in this application embodiment under another application scenario; Figure 19 A schematic diagram of the energy flow of the vehicle power supply device provided in this application embodiment in another application scenario; Figure 20 This is a schematic diagram of the structure of a wireless charging pile provided in an embodiment of this application; Figure 21 This is a schematic diagram of an inverter network provided in an embodiment of this application; Figure 22 A schematic diagram of a resonant network provided in an embodiment of this application; Figure 23 This is a schematic diagram of another wireless charging pile provided in an embodiment of this application; Figure 24 A flowchart illustrating a control method provided in an embodiment of this application; Figure 25 A simulation waveform diagram of the vehicle power supply device provided in an embodiment of this application under an application scenario; Figure 26 A simulation waveform diagram of the vehicle power supply device provided in an embodiment of this application in another application scenario; Figure 27 A simulation waveform diagram of the vehicle power supply device provided in this application embodiment under another application scenario. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0028] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0029] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0030] Vehicle-mounted DC-DC converters convert high-voltage direct current (DC) to low-voltage DC to charge the low-voltage batteries or low-voltage loads in electric vehicles. With the increasing development and refinement of wireless charging technology, wireless charging systems for electric vehicles are becoming more widespread. Wireless charging systems convert alternating current (AC) into high-voltage direct current (DC) via wireless power transmission to charge high-voltage batteries.

[0031] Traditional automotive DC-DC converters typically use a separate DC-DC converter to convert high-voltage DC to low-voltage DC. For example, phase-shifted full-bridge converters and full-bridge LLC converters are used as the main circuitry of the automotive DC-DC converter.

[0032] Therefore, to accommodate the charging needs of both high-voltage and low-voltage batteries, traditional vehicle power systems typically provide electric vehicles with separate WPT subsystems and onboard DC-DC subsystems, such as... Figure 1 As shown.

[0033] However, since the WPT subsystem and the on-board DC-DC subsystem in traditional vehicle power systems are two independent systems, the cost of vehicle power systems is high and their size is large, which is not conducive to the miniaturization of vehicle power systems.

[0034] In view of the above, embodiments of this application provide an on-board power supply device, a mobile device, an on-board power supply system, and a control method. The on-board power supply device includes: a wireless charging receiving circuit and a first half-bridge circuit; the wireless charging receiving circuit is connected to the first half-bridge circuit; the wireless charging receiving circuit includes a first rectifier circuit, which includes a second half-bridge circuit and a third half-bridge circuit; the output terminals of the second and third half-bridge circuits are respectively connected to the output terminal of the first half-bridge circuit; the wireless charging receiving circuit is configured to be electromagnetically coupled to a wireless charging pile, receive electrical energy transmitted from the wireless charging pile, and convert it into high-voltage direct current (DC), which is used to charge a high-voltage battery in the mobile device; the second and third half-bridge circuits are configured to receive the DC and invert it into alternating current (AC), which is used to charge a low-voltage battery in the mobile device when converted to low-voltage DC.

[0035] To make the purpose and technical solution of this application clearer and more intuitive, the radio frequency signal receiving device provided in the embodiments of this application will be explained in detail below with reference to the accompanying drawings.

[0036] Please see Figure 2 , Figure 2 This is a schematic diagram of the structure of an on-board power supply device provided in an embodiment of this application. Figure 2 As shown, the vehicle power supply device 1000 may include: a wireless charging receiver circuit 100 and a first half-bridge circuit 211; the wireless charging receiver circuit 100 is connected to the first half-bridge circuit 211.

[0037] The wireless charging receiver circuit 100 includes a first rectifier circuit 110, which includes a second half-bridge circuit 111 and a third half-bridge circuit 112.

[0038] The output terminals of the second half-bridge circuit 111 and the third half-bridge circuit 112 are respectively connected to the output terminal of the first half-bridge circuit 211.

[0039] The wireless charging receiver circuit 100 is configured to be coupled to the wireless charging station via electromagnetic induction, receive the electrical energy transmitted by the wireless charging station, and convert it into high-voltage direct current. The high-voltage direct current is used to charge the high-voltage battery HV-BATT in the mobile device.

[0040] Wireless charging piles refer to energy transmitting devices installed on the ground or on the side of infrastructure. They convert grid power into high-frequency magnetic field energy and achieve wireless power transmission through electromagnetic induction coupling.

[0041] The wireless charging station and the wireless charging receiver circuit 100 constitute the WPT system. Through the WPT system, alternating current (AC) from the power grid can be transmitted to the wireless charging receiver circuit 100 via electromagnetic induction coupling (i.e., wireless power transfer). The wireless charging receiver circuit 100 then converts the AC power into high-voltage direct current (DC), thus achieving the conversion of AC power into DC power via wireless power transfer. This enables the charging of high-voltage batteries (HV-BATT). In other words, the wireless charging receiver circuit 100 is the wireless charging vehicle-side device in the WPT system.

[0042] The mobile device can be an electric vehicle, an aircraft, or other mobile devices powered by electricity. This application does not specifically limit the types of mobile devices that can be used.

[0043] The first half-bridge circuit 211 and the second half-bridge circuit 111 are configured to receive high-voltage direct current and invert the high-voltage direct current into alternating current, which is used to charge the low-voltage battery BAT in the mobile device when converted to low-voltage direct current.

[0044] Specifically, the first half-bridge circuit 211 and the second half-bridge circuit 111 invert high-voltage direct current into alternating current, thus enabling the first half-bridge circuit 211 and the second half-bridge circuit 111 to function as an inverter circuit. Simultaneously, by utilizing the first half-bridge circuit 211 and the second half-bridge circuit 111 to invert high-voltage direct current into alternating current, and when converting alternating current into low-voltage direct current, the vehicle power supply unit 1000 operates in a DC-DC converter mode, enabling it to perform the function of a DC-DC converter circuit. In other words, the vehicle power supply unit 1000 also possesses the function of a DC-DC converter circuit.

[0045] Based on this, it can be seen that the first half-bridge circuit 211, by sharing the second half-bridge circuit 111 in the first rectifier circuit 110, realizes the function of inverting high-voltage DC power into AC power, i.e., the function of an inverter circuit. Thus, one half-bridge circuit and the drive circuit for driving that half-bridge circuit can be eliminated in the vehicle power supply device 1000. This reduces the size of the vehicle power supply device 1000, facilitating miniaturization and lowering its cost.

[0046] In this embodiment, the vehicle power supply device includes: a wireless charging receiving circuit and a first half-bridge circuit; the wireless charging receiving circuit is connected to the first half-bridge circuit; the wireless charging receiving circuit includes a first rectifier circuit, which includes a second half-bridge circuit and a third half-bridge circuit; the output terminals of the second half-bridge circuit and the third half-bridge circuit are respectively connected to the output terminal of the first half-bridge circuit; the wireless charging receiving circuit is configured to be coupled to a wireless charging pile via electromagnetic induction, receive electrical energy transmitted by the wireless charging pile, and convert it into high-voltage direct current (DC), which is used to charge the high-voltage battery in the mobile device; the second half-bridge circuit and the third half-bridge circuit are configured to receive the DC and invert it into alternating current (AC), which is used to charge the low-voltage battery in the mobile device when converted to low-voltage DC.

[0047] As can be seen from the above, the first half-bridge circuit achieves the function of inverting high-voltage DC power into AC power by sharing the second half-bridge circuit in the first rectifier circuit, i.e., the function of an inverter circuit. Thus, one half-bridge circuit and the drive circuit for driving that half-bridge circuit can be eliminated in the vehicle power supply device. This reduces the size of the vehicle power supply device, facilitating miniaturization and lowering its cost.

[0048] In one possible implementation, when both the high-voltage battery HV-BATT and the low-voltage battery BAT are in a charging state, the first half-bridge circuit 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 are all in an operating state; wherein, in the operating state, the first power transistor Q1 and the second power transistor Q2 in each of the first half-bridge circuit 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 are complementaryly turned on.

[0049] The complementary conduction of the first power transistor Q1 and the second power transistor Q2 means that the first power transistor Q1 and the second power transistor Q2 conduct alternately, without conducting simultaneously. That is, when the first power transistor Q1 is on, the second power transistor Q2 is off, and when the first power transistor Q1 is off, the second power transistor Q2 is on.

[0050] Specifically, when the high-voltage battery HV-BATT is charging, it means that the wireless charging receiver circuit 100 is operational, i.e., the WPT system is operational. When the low-voltage battery BAT is charging, it means that the on-board power supply unit 1000 operates in DC-DC conversion mode, i.e., the DC-DC conversion circuit is operational. When both the high-voltage battery HV-BATT and the low-voltage battery BAT are charging, it means that both the WPT system and the DC-DC conversion circuit are operational simultaneously.

[0051] When the high-voltage battery HV-BATT is charging and the low-voltage battery BAT is not charging, the second half-bridge circuit 111 and the third half-bridge circuit 112 are both in operation, while the first half-bridge circuit 211 is in a non-operating state. In the non-operating state, the first power transistor Q1 and the second power transistor Q2 are both in a turned-off state.

[0052] When the low-voltage battery BAT is not charging, it means that the vehicle power supply unit 1000 does not operate in the mode of DC-DC conversion circuit, that is, the DC-DC conversion circuit is in a non-operating state.

[0053] When the high-voltage battery HV-BATT is in a non-charging state and the low-voltage battery BAT is in a charging state, the first half-bridge circuit 211 and the second half-bridge circuit 111 are both in operation, while the third half-bridge circuit 112 is in a non-operating state.

[0054] When the high-voltage battery HV-BATT is not charging, it means that the wireless charging receiver circuit 100 is not working, that is, the WPT system is not working.

[0055] When both the high-voltage battery HV-BATT and the low-voltage battery BAT are not charging, the first half-bridge circuit 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 are all in a non-operating state.

[0056] In one possible implementation, please refer to Figure 3 , Figure 3 This is a schematic diagram of another vehicle-mounted power supply device provided in an embodiment of this application. Figure 3 As shown, the on-board power supply unit 1000 may also include a transformer 220.

[0057] The primary side of transformer 220 is connected to the midpoint of the first half-bridge circuit 211 and the midpoint of the second half-bridge circuit 111.

[0058] Transformer 220 is configured to transmit AC power to the secondary side of transformer 220 when high-voltage DC power is inverted to AC power through first half-bridge circuit 211 and second half-bridge circuit 111.

[0059] Transformer 220 may be, for example, a transformer with a center tap. Transformer 220 may also be, for example, a magnetically integrated transformer, which can further reduce the cost and size of the on-board power supply unit 1000. Exemplarily, transformer 220 may also be referred to as a DC-DC transformer.

[0060] In this process, AC power is transmitted to the secondary side of transformer 220, which means that transformer 220 transmits AC power to the side of low-voltage battery BAT.

[0061] In some examples, such as Figure 4 As shown, the midpoint of the second half-bridge circuit 111 is connected to the primary side of the transformer 220 through an inductor and a capacitor.

[0062] When alternating current passes through inductors and capacitors, its waveform becomes closer to a sine wave.

[0063] In one possible implementation, please refer to Figure 5 , Figure 5 This is a schematic diagram of another vehicle-mounted power supply device provided in an embodiment of this application. (See attached diagram.) Figure 5 As shown, the vehicle power supply unit 1000 may further include: a rectifier and filter circuit 230.

[0064] The input terminal of the rectifier filter circuit 230 is connected to the secondary side of the transformer 220, and the output terminal of the rectifier filter circuit 230 and the secondary side of the transformer 220 are both connected to the low-voltage battery BAT.

[0065] The rectifier-filter circuit 230 is configured to rectify and filter AC power into low-voltage DC power.

[0066] It should be noted that: in the embodiments of this application, the high-frequency AC power is also called the first high-frequency AC power, the compensated high-frequency AC power is also called the compensated first high-frequency AC power, the high-voltage DC power is also called the first high-voltage DC power, and the AC power is also called the first AC power, in order to distinguish them from the second high-frequency AC power, the compensated second high-frequency AC power, the second high-voltage DC power, and the second AC power in the charging pile.

[0067] In one possible implementation, please refer to Figure 6 , Figure 6 This is a schematic diagram of a rectifier filter circuit provided in an embodiment of this application. Figure 6 As shown, the rectifier-filter circuit 230 may include a second rectifier circuit 231 and a first filter circuit 232.

[0068] The input terminal of the second rectifier circuit 231 is the input terminal of the rectifier filter circuit 230, and the output terminal of the first filter circuit 232 is the output terminal of the rectifier filter circuit 230.

[0069] The input terminal of the second rectifier circuit 231 is connected to the secondary side of the transformer 220, the output terminal of the second rectifier circuit 231 is connected to the input terminal of the first filter circuit 232, and the output terminal of the first filter circuit 232 is connected to the low-voltage battery BAT.

[0070] The second rectifier circuit 231 is configured to rectify the alternating current into rectified alternating current.

[0071] The rectified alternating current is essentially direct current containing alternating current ripple.

[0072] The first filter circuit 232 is configured to filter the rectified AC power into low-voltage DC power.

[0073] In one possible implementation, please refer to Figure 7 , Figure 7 This is a schematic diagram of a second rectifier circuit provided in an embodiment of this application. Figure 7 As shown, the second rectifier circuit 231 may include: a first diode D1 and a second diode D2.

[0074] In this circuit, the positive terminals of the first diode D1 and the second diode D2 are both input terminals of the second rectifier circuit 231, and the negative terminals of the first diode D1 and the second diode D2 are both output terminals of the second rectifier circuit 231.

[0075] The positive terminals of the first diode D1 and the second diode D2 are both connected to the secondary side of the transformer 220, and the negative terminals of the first diode D1 and the second diode D2 are both connected to the input terminal of the first filter circuit 232.

[0076] The second rectifier circuit 231 can also be a rectifier circuit composed of full-bridge diodes. Alternatively, the second rectifier circuit 231 can also be a full-bridge switching network composed of four power transistors. This application does not specifically limit this embodiment.

[0077] In one possible implementation, please refer to Figure 8 , Figure 8 This is a schematic diagram of another second rectifier circuit provided in an embodiment of this application. Figure 8 As shown, when the second rectifier circuit 231 is a full-bridge switching network, since the second rectifier circuit 231 located on the primary side of the transformer 220 is a full-bridge switching network, and the inverter circuit 210 located on the secondary side of the transformer 220 is an active full-bridge composed of the first half-bridge circuit 211 and the second half-bridge circuit 111, the DC-DC converter circuit has a dual active bridge (DAB) topology.

[0078] In one possible implementation, please refer to Figure 9 , Figure 9 This is a schematic diagram of a first filter circuit provided in an embodiment of this application. Figure 9 As shown, the first filter circuit 232 may include: a first inductor L1, a first capacitor C1 and a first resistor R1.

[0079] Wherein, the first end of the first inductor L1 is the input end of the first filter circuit 232, and the second end of the first inductor L1, the first end of the first resistor R1 and the second plate of the first capacitor C1 are all the output ends of the first filter circuit 232.

[0080] The first end of the first inductor L1 is connected to the output end of the second rectifier circuit 231. The second end of the first inductor L1, the first end of the first resistor R1, and the second plate of the first capacitor C1 are all connected to the low-voltage battery BAT. The second end of the first resistor R1 is connected to the first plate of the first capacitor C1.

[0081] In one possible implementation, please refer to Figure 10 , Figure 10 This is a schematic diagram of a half-bridge circuit provided in an embodiment of this application. Figure 10 As shown, each of the first half-bridge circuits 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 may include: a first power transistor Q1 and a second power transistor Q2.

[0082] The drain of the first power transistor Q1 is the positive output terminal of the half-bridge circuit, and the source of the second power transistor Q2 is the negative output terminal of the half-bridge circuit. The source of the first power transistor Q1 and the drain of the second power transistor Q2 are connected. The midpoint of the half-bridge circuit is located between the source of the first power transistor Q1 and the drain of the second power transistor Q2. The gate of the first power transistor Q1 and the gate of the second power transistor Q2 are both connected to the first control signal. The first control signal is used to control the conduction or cutoff of the power transistors. The output terminals of the half-bridge circuit include the positive output terminal and the negative output terminal.

[0083] In this circuit, the first power transistor Q1 is the upper transistor in the half-bridge circuit, and the second power transistor Q2 is the lower transistor in the half-bridge circuit. In the first half-bridge circuit 211, the first power transistor is represented by the letter Q1-1, and the second power transistor by the letter Q2-1. In the second half-bridge circuit 111, the first power transistor is represented by the letter Q1-2, and the second power transistor by the letter Q2-2. In the third half-bridge circuit 112, the first power transistor is represented by the letter Q1-3, and the second power transistor by the letter Q2-3.

[0084] For example, the stage in which the first power transistor Q1-3 in the third half-bridge circuit 112 and the first power transistor Q1-2 in the second half-bridge circuit 111 are simultaneously turned on is defined as the first turn-on stage Ton1. The stage in which the first power transistor Q1-2 in the second half-bridge circuit 111 and the first power transistor Q1-1 in the first half-bridge circuit 211 are simultaneously turned on is defined as the second turn-on stage Ton2.

[0085] It should be noted that the first power transistor Q1 and the second power transistor Q2 can be metal-oxide-semiconductor field-effect transistors (MOSFETs). Furthermore, the power transistors can also be insulated-gate bipolar transistors (IGBTs), integrated-gate rectifier thyristors (ICTs), gate-off thyristors (GRTs), silicon controlled rectifiers (SCRs), junction-gate field-effect transistors (JGFETs), MOS-controlled thyristors, gallium nitride-based power devices, silicon nitride-based power devices, etc. This application does not specifically limit these types of devices.

[0086] In one possible implementation, please refer to Figure 11 , Figure 11 This is a schematic diagram of a wireless charging receiver circuit provided in an embodiment of this application. Figure 11 As shown, the wireless charging receiver circuit 100 may further include: a receiving coil LRX and a resonant circuit 120.

[0087] The receiving coil LRX is connected to the resonant circuit 120, which is also connected to the input terminal of the first rectifier circuit 110.

[0088] The receiving coil LRX is configured to be coupled to the wireless charging station via electromagnetic induction to receive electrical energy transmitted by the wireless charging station.

[0089] The resonant circuit 120 is configured to compensate for the electrical energy transmitted by the wireless charging pile to obtain high-frequency AC power, and transmit the high-frequency AC power to the first rectifier circuit 110 to rectify the high-frequency AC power to obtain rectified high-frequency AC power.

[0090] The rectified high-frequency alternating current is essentially direct current.

[0091] The electrical energy transmitted by the wireless charging pile is compensated by the resonant circuit 120, which compensates for the reactive power in the WPT system, thereby improving the efficiency of the WPT system.

[0092] The first rectifier circuit 110, upon receiving high-frequency AC power, is able to rectify the high-frequency AC power to obtain rectified high-frequency AC power.

[0093] In one possible implementation, please refer to Figure 12 , Figure 12 This is a schematic diagram of a resonant circuit provided in an embodiment of this application. Figure 12 As shown, the resonant circuit 120 may include: a second inductor L2, a second capacitor C2, and a third capacitor C3.

[0094] The first plate of the second capacitor C2 is connected to the receiving coil LRX. The second plate of the second capacitor C2 is connected to the first end of the second inductor L2 and the first plate of the third capacitor C3. The second end of the second inductor L2 and the second plate of the third capacitor C3 are both connected to the input end of the first rectifier circuit 110.

[0095] For example, the second inductor L2 can be a magnetically integrated inductor. By using a magnetically integrated inductor, the cost of the wireless charging receiver circuit 100 can be further reduced, thereby further reducing the cost of the vehicle power supply device 1000 and further reducing the size of the wireless charging receiver circuit 100, thereby further reducing the size of the vehicle power supply device 1000.

[0096] The resonant circuit 120 can be an LC topology resonant circuit or an LCL topology resonant circuit; this application does not specifically limit this.

[0097] In one possible implementation, please refer to Figure 13 , Figure 13 This is a schematic diagram of another wireless charging receiver circuit provided in an embodiment of this application. Figure 13 As shown, the wireless charging receiver circuit 100 may further include a second filter circuit 130.

[0098] The input terminal of the second filter circuit 130 is connected to the output terminal of the first rectifier circuit 110, and the output terminal of the second filter circuit 130 is connected to the high-voltage battery HV-BATT.

[0099] The second filter circuit 130 is configured to filter the rectified high-frequency AC power to obtain high-voltage DC power.

[0100] In one possible implementation, please refer to Figure 14 , Figure 14 This is a schematic diagram of a second filter circuit provided in an embodiment of this application. Figure 14 As shown, the second filter circuit 130 may include: a third inductor L3, a fourth capacitor C4, and a fifth capacitor C5.

[0101] Among them, the first terminal of the third inductor L3, the first plate of the fourth capacitor C4, the second plate of the fourth capacitor C4, and the second plate of the fifth capacitor C5 are all input terminals of the second filter circuit 130, and the second terminal of the third inductor L3 and the first plate of the fifth capacitor C5 are both output terminals of the second filter circuit 130.

[0102] The first terminal of the third inductor L3, the first plate of the fourth capacitor C4, the second plate of the fourth capacitor C4, and the second plate of the fifth capacitor C5 are all connected to the output terminal of the first rectifier circuit 110. The second terminal of the third inductor L3 and the first plate of the fifth capacitor C5 are all connected to the high-voltage battery HV-BATT.

[0103] The first rectifier circuit 110 includes a second half-bridge circuit 111 and a third half-bridge circuit 112. The vehicle power supply device 1000 also includes a transformer 220 and a rectifier-filter circuit 230. The rectifier-filter circuit 230 includes a second rectifier circuit 231 and a first filter circuit 232. The second rectifier circuit 231 includes a first diode D1 and a second diode D2. The first filter circuit 232 includes a first inductor L1, a first capacitor C1, and a first resistor R1. Each half-bridge circuit in the first half-bridge circuit 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 includes a first power transistor Q1 and a second power transistor Q2. The wireless charging receiver circuit 100 also includes a receiving coil LRX, a resonant circuit 120, and a second filter circuit 130. The resonant circuit 120 includes a second inductor L2, a second capacitor C2, and a third capacitor C3. The second filter circuit 130 includes a third inductor L3, a fourth capacitor C4, and a fifth capacitor C5. When the transformer 220 is a transformer with a center tap, the vehicle power supply device 1000... Figure 15 As shown.

[0104] Based on the foregoing embodiments, this application provides a mobile device, which includes: a high-voltage storage battery HV-BATT, a low-voltage storage battery BAT, and an on-board power supply device 1000 provided in this application.

[0105] Both the high-voltage battery HV-BATT and the low-voltage battery BAT are connected to the vehicle power supply unit 1000.

[0106] The on-board power supply unit 1000 is configured to charge the high-voltage battery HV-BATT and the low-voltage battery BAT, respectively.

[0107] Typically, to meet the different charging needs of mobile devices, the vehicle power supply unit 1000 will be used in different application scenarios. The following will combine... Figure 16 The vehicle power supply device 1000 shown illustrates the energy flow of the vehicle power supply device 1000 in different application scenarios.

[0108] Please see Figure 16 , Figure 16 This is a schematic diagram illustrating the energy flow of the vehicle-mounted power supply device provided in an embodiment of this application in one application scenario. For example... Figure 16As shown, when both the high-voltage battery HV-BATT and the low-voltage battery BAT are charging, the wireless charging receiver circuit 100 receives electrical energy transmitted from the wireless charging station and converts it into high-voltage direct current. Then, the wireless charging receiver circuit 100 transmits the high-voltage direct current to the high-voltage battery HV-BATT to charge it.

[0109] Meanwhile, the first half-bridge circuit 211 and the second half-bridge circuit 111 receive high-voltage DC power and invert the high-voltage DC power into AC power. When the AC power is converted into low-voltage DC power, the vehicle power supply device 1000 transmits the low-voltage DC power to the low-voltage battery BAT to charge the low-voltage battery BAT.

[0110] Based on this, it can be seen that the electrical energy transmitted by the wireless charging pile is transferred to the high-voltage battery HV-BATT. Simultaneously, high-voltage DC power is obtained from the high-voltage battery HV-BATT through the first half-bridge circuit 211 and the second half-bridge circuit 111, and then transferred to the low-voltage battery BAT. In other words, the energy in the vehicle power supply unit 1000 consists of electrical energy transmitted by the wireless charging pile flowing from the receiving coil LRX to the high-voltage battery HV-BATT, and high-voltage DC power flowing from the high-voltage battery BAT through the first half-bridge circuit 211 and the second half-bridge circuit 111.

[0111] Among them, the first half-bridge circuit 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 are all in operation. The waveforms of the first control signal VQ1-1 corresponding to the first power transistor Q1-1 in the first half-bridge circuit 211, the first control signal VQ1-2 corresponding to the first power transistor Q1-2 in the second half-bridge circuit 111, and the first control signal VQ1-3 corresponding to the first power transistor Q1-3 in the third half-bridge circuit 112 are as follows: Figure 17 As shown.

[0112] It should be noted that: because the first power transistor Q1-1 and the second power transistor Q2-1 in the first half-bridge circuit 211, the first power transistor Q1-2 and the second power transistor Q2-2 in the second half-bridge circuit 111, and the first power transistor Q1-3 and the second power transistor Q2-3 in the third half-bridge circuit 112 are complementary in their conduction, therefore... Figure 17 The diagram only shows the waveforms of the first control signals corresponding to the first power transistor Q1-1 in the first half-bridge circuit 211, the first power transistor Q1-2 in the second half-bridge circuit 111, and the first power transistor Q1-3 in the third half-bridge circuit 112.

[0113] Since the first half-bridge circuit 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 are all in operation, the switching frequency f2 corresponding to the DC-DC converter mode of the vehicle power supply device 1000 must be consistent with the switching frequency f1 corresponding to the WPT system. For example, according to the national standard for wireless charging systems, the switching frequency f1 corresponding to the WPT system is typically 85.5kHz.

[0114] Please see Figure 18 , Figure 18 This is a schematic diagram illustrating the energy flow of the vehicle-mounted power supply device provided in this application embodiment under another application scenario. For example... Figure 18 As shown, when the high-voltage battery HV-BATT is in a charging state and the low-voltage battery BAT is in a non-charging state, the wireless charging receiving circuit 100 receives electrical energy transmitted from the wireless charging pile and converts it into high-voltage direct current. Then, the wireless charging receiving circuit 100 transmits the high-voltage direct current to the high-voltage battery HV-BATT to charge it.

[0115] Based on this, it can be seen that the electrical energy transmitted by the wireless charging pile is transferred to the high-voltage battery HV-BATT. In other words, the energy in the vehicle power unit 1000 is the electrical energy transmitted by the wireless charging pile flowing from the receiving coil LRX to the high-voltage battery HV-BATT.

[0116] In this circuit, the second half-bridge circuit 111 and the third half-bridge circuit 112 are both in operation, while the first half-bridge circuit 211 is in a non-operational state.

[0117] Please see Figure 19 , Figure 19 This is a schematic diagram illustrating the energy flow of the vehicle-mounted power supply device provided in this application embodiment under another application scenario. For example... Figure 19 As shown, when the high-voltage battery HV-BATT is in a non-charging state and the low-voltage battery BAT is in a charging state, simultaneously, the first half-bridge circuit 211 and the second half-bridge circuit 111 receive the high-voltage DC power from the high-voltage battery HV-BATT and invert the high-voltage DC power into AC power. Then, when the AC power is converted to low-voltage DC power, the on-board power supply unit 1000 transmits the low-voltage DC power to the low-voltage battery BAT to charge the low-voltage battery BAT.

[0118] Based on this, it can be seen that high-voltage DC power is obtained from the high-voltage battery HV-BATT through the first half-bridge circuit 211 and the second half-bridge circuit 111, and then transmitted to the low-voltage battery BAT. In other words, the energy in the vehicle power supply unit 1000 is high-voltage DC power flowing to the low-voltage battery BAT via the inverter circuit 210.

[0119] In this circuit, the first half-bridge circuit 211 and the second half-bridge circuit 111 are both in operation, while the third half-bridge circuit 112 is in a non-operational state.

[0120] With both the high-voltage battery HV-BATT and the low-voltage battery BAT in a non-charging state, the first half-bridge circuit 211, the second half-bridge circuit 111, and the third half-bridge circuit 112 are all in a non-operating state. Simultaneously, the power transistors and relays in the wireless charging pile are also in a non-operating state, i.e., off. Therefore, it can be concluded that there is no energy flow in the vehicle power supply unit 1000.

[0121] The description of the mobile device embodiments above is similar to that of the vehicle-mounted power supply device embodiments above, and has similar beneficial effects. For technical details not disclosed in the mobile device embodiments of this application, please refer to the description of the vehicle-mounted power supply device embodiments of this application for understanding.

[0122] This application provides an on-board power system, which includes a wireless charging pile and an on-board power device 1000 provided in this application.

[0123] The wireless charging station is configured to transmit wireless power to the vehicle power supply unit 1000 via electromagnetic induction coupling.

[0124] In one possible implementation, please refer to Figure 20 , Figure 20 This is a schematic diagram of a wireless charging pile provided in an embodiment of this application. Figure 20 As shown, the line charging station 2000 may include: a third filter circuit 300, a power factor correction circuit 400, an inverter network 500, a resonant network 600, and a transmitting coil LTX.

[0125] The third filter circuit 300 is connected to the input terminal of the power factor correction circuit 400. The output terminal of the power factor correction circuit 400 is connected to the input terminal of the inverter network 500. The output terminal of the inverter network 500 is connected to the resonant network 600. The resonant network 600 is also connected to the transmitting coil LTX.

[0126] The third filter circuit 300, power factor correction circuit 400, inverter network 500, resonant network 600 and transmitting coil LTX can be set separately or integrated. This application embodiment does not specifically limit this.

[0127] The third filter circuit 300 is configured to filter the power grid AC frequency to obtain the filtered power grid AC frequency, and then transmit the filtered power grid AC frequency to the power factor correction circuit 400.

[0128] For example, the third filter circuit 300 is an electromagnetic compatibility (EMC) filter circuit, i.e., an EMC filter circuit.

[0129] The power grid frequency AC power can be single-phase AC power or three-phase AC power; this application does not specifically limit this.

[0130] The power factor correction circuit 400 is configured to convert the filtered mains frequency AC power into a second high voltage DC power and transmit the second high voltage DC power to the inverter network 500.

[0131] Since the full English name of the power factor correction circuit 400 is power factor correction circuit, it can also be called a PFC circuit.

[0132] For example, when the mains AC power is single-phase, the PFC circuit is a single-phase PFC circuit. When the mains AC power is three-phase, the PFC circuit is a three-phase PFC circuit.

[0133] Inverter network 500 is configured to invert the second high-voltage direct current into a second high-frequency alternating current and transmit the second high-frequency alternating current to resonant network 600.

[0134] The resonant network 600 is configured to compensate the second high-frequency AC current to obtain the compensated second high-frequency AC current, and to transmit the compensated second high-frequency AC current to the transmitting coil LTX.

[0135] The transmitting coil LTX is configured to transmit electromagnetic waves generated by the compensated second high-frequency alternating current to the vehicle power supply unit 1000.

[0136] The transmitting coil LTX is coupled to the receiving coil LRX via electromagnetic waves, enabling electromagnetic induction coupling between the two coils. This allows the wireless charging station 2000 to be coupled to the vehicle-mounted power supply unit 1000.

[0137] In addition, the third filter circuit 300, the power factor correction circuit 400, the inverter network 500 and the resonant network 600 constitute the wireless charging wall-end device in the WPT system, and the transmitting coil LTX is the wireless charging ground device in the WPT system.

[0138] In one possible implementation, please refer to Figure 21 , Figure 21 This is a schematic diagram of an inverter network provided in an embodiment of this application. Figure 21As shown, the inverter network 500 may include: a third power transistor Q3, a fourth power transistor Q4, a fifth power transistor Q5, and a sixth power transistor Q6.

[0139] The drain terminals of the third power transistor Q3, the drain terminals of the fourth power transistor Q4, the source terminals of the fifth power transistor Q5, and the source terminals of the sixth power transistor Q6 are all input terminals of the inverter network 500. The midpoint between the source terminal of the third power transistor Q3 and the drain terminal of the fifth power transistor Q5, and the midpoint between the source terminal of the fourth power transistor Q4 and the drain terminal of the sixth power transistor Q6 are all output terminals of the inverter network 500.

[0140] The drain of the third power transistor Q3, the drain of the fourth power transistor Q4, the source of the fifth power transistor Q5, and the source of the sixth power transistor Q6 are all connected to the output of the power factor correction circuit 400. The source of the third power transistor Q3 is connected to the drain of the fifth power transistor Q5, and the source of the fourth power transistor Q4 is connected to the drain of the sixth power transistor Q6. The midpoint between the source of the third power transistor Q3 and the drain of the fifth power transistor Q5, and the midpoint between the source of the fourth power transistor Q4 and the drain of the sixth power transistor Q6 are all connected to the resonant network 600. The gate of the third power transistor Q3, the gate of the fourth power transistor Q4, the gate of the fifth power transistor Q5, and the gate of the sixth power transistor Q6 are all connected to the second control signal, which is used to control the power transistors to turn on or off.

[0141] It should be noted that the third power transistor Q3, the fourth power transistor Q4, the fifth power transistor Q5, and the sixth power transistor Q6 can be metal-oxide-semiconductor field-effect transistors (MOSFETs). Furthermore, the power transistors can also be insulated-gate bipolar transistors (IGBTs), integrated-gate rectifier thyristors (ICTs), gate-off thyristors (GRTs), silicon controlled rectifiers (SCRs), junction-gate field-effect transistors (JGFETs), MOS-controlled thyristors, gallium nitride-based power devices, silicon nitride-based power devices, etc. This application does not specifically limit these types of transistors.

[0142] In one possible implementation, please refer to Figure 22 , Figure 22 This is a schematic diagram of a resonant network provided in an embodiment of this application. Figure 22 As shown, the resonant network 600 may include: a fourth inductor L4, a sixth capacitor C6, and a seventh capacitor C7.

[0143] The first end of the fourth inductor L4 and the second plate of the sixth capacitor C6 are both connected to the output end of the inverter network 500. The second end of the fourth inductor L4 and the first plate of the sixth capacitor C6 are both connected to the first plate of the seventh capacitor C7. The second plate of the seventh capacitor C7 is connected to the transmitting coil LTX.

[0144] The resonant network 600 can be a resonant circuit with an LC topology or a resonant circuit with an LCL topology. This application does not specifically limit this.

[0145] With the inverter network 500 including the third power transistor Q3, the fourth power transistor Q4, the fifth power transistor Q5, and the sixth power transistor Q6, the resonant network 600 including the fourth inductor L4, the sixth capacitor C6, and the seventh capacitor C7, and the third filter circuit 300 being an EMC filter circuit, the wireless charging pile 2000, as follows: Figure 23 As shown.

[0146] The description of the above vehicle power system embodiments is similar to the description of the above vehicle power device embodiments, and has similar beneficial effects. For technical details not disclosed in the vehicle power system embodiments of this application, please refer to the description of the vehicle power device embodiments of this application for understanding.

[0147] Please refer to the following. Figure 24 , Figure 24 This is a flowchart illustrating a control method provided in an embodiment of this application. Figure 24 As shown, the method includes: S101 The wireless charging receiving circuit is coupled to the wireless charging pile through electromagnetic induction, receives the electrical energy transmitted by the wireless charging pile, and converts it into high-voltage direct current. The high-voltage direct current is used to charge the high-voltage battery in the mobile device.

[0148] S102, the first half-bridge circuit and the second half-bridge circuit receive high-voltage direct current and invert the high-voltage direct current into alternating current. The alternating current is used to charge the low-voltage battery in the mobile device when it is converted into low-voltage direct current.

[0149] In some possible embodiments, the method further includes: When both the high-voltage and low-voltage batteries are charging, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in operation. In operation, the first power transistor and the second power transistor in each half-bridge circuit are complementary and conduct.

[0150] When the high-voltage battery is charging and the low-voltage battery is not charging, both the second and third half-bridge circuits are in operation, while the first half-bridge circuit is not in operation. In the non-operational state, both the first and second power transistors are turned off.

[0151] When the high-voltage battery is not charging and the low-voltage battery is charging, the first half-bridge circuit and the second half-bridge circuit are both in operation, while the third half-bridge circuit is not in operation.

[0152] When both the high-voltage and low-voltage batteries are not charging, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in a non-operating state.

[0153] In some possible embodiments, the method further includes: When both the high-voltage and low-voltage batteries are charging, the magnitude of the low-voltage DC current is controlled by controlling the duration for which the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit are simultaneously turned on, and the magnitude of the high-voltage DC current is controlled by controlling the duration for which the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit are simultaneously turned on.

[0154] Specifically, by controlling the duration of simultaneous conduction of the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit, that is, by controlling the duration of the second conduction stage Ton2, the magnitude of the low-voltage DC current (i.e., the output voltage and output current of the vehicle power supply device 1000 in DC-DC conversion circuit mode) can be adjusted to adapt to the different charging voltage and power requirements of the low-voltage battery BAT or the low-voltage load.

[0155] Meanwhile, by controlling the duration of simultaneous conduction of the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit, that is, by controlling the duration of the first conduction stage Ton1, the magnitude of the high voltage direct current (i.e., the output voltage and output current of the WPT system) can be adjusted to adapt to the different charging voltage and power requirements of the high voltage battery HV-BATT.

[0156] When the high-voltage battery is charging and the low-voltage battery is not charging, the magnitude of the high-voltage DC current is controlled by controlling the duration for which the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit are simultaneously turned on.

[0157] Specifically, by controlling the duration of simultaneous conduction of the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit, that is, by controlling the duration of the first conduction phase Ton1, the magnitude of the high-voltage direct current (i.e., the output voltage and output current of the WPT system) can be adjusted to meet the charging requirements of the high-voltage battery HV-BATT.

[0158] When the high-voltage battery is in a non-charging state and the low-voltage battery is in a charging state, the magnitude of the low-voltage DC current is controlled by controlling the duration for which the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit are simultaneously turned on.

[0159] Specifically, by controlling the duration of simultaneous conduction of the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit, that is, by controlling the duration of the second conduction phase Ton2, the magnitude of the low-voltage DC current (i.e., the output voltage and output current of the vehicle power supply device 1000 in DC-DC conversion circuit mode) can be adjusted to meet the charging requirements of the low-voltage battery BAT or the low-voltage load.

[0160] Furthermore, by changing the switching frequency f2 corresponding to the DC-DC converter circuit mode, the size of the magnetic components in the vehicle power supply unit 1000 is reduced, thereby enabling the vehicle power supply unit 1000 to achieve better performance, size, and cost.

[0161] The description of the above control method embodiments is similar to that of the above vehicle-mounted power supply device embodiments, and has similar beneficial effects. For technical details not disclosed in the control method embodiments of this application, please refer to the description of the vehicle-mounted power supply device embodiments of this application for understanding.

[0162] The simulation results of the embodiments of this application in different application scenarios will be described below.

[0163] Please see Figure 25 , Figure 25 This is a simulated waveform diagram of the vehicle-mounted power supply device provided in an embodiment of this application under one application scenario. For example... Figure 25 As shown, when both the high-voltage battery HV-BATT and the low-voltage battery BAT are charging, the high-voltage DC charging current (i.e., high-voltage DC current) can meet the charging requirements of the high-voltage battery HV-BATT, and the low-voltage DC charging current (i.e., low-voltage DC current) can meet the charging requirements of the low-voltage battery BAT or the low-voltage load. In other words, the on-board power supply device 1000 provided in this application embodiment has practical application value.

[0164] in, Figure 25 The diagram also illustrates the waveforms of the current corresponding to the high-frequency AC output of the resonant circuit (i.e., the WPT vehicle-end resonant current) and the primary current of the transformer (i.e., the DC-DC transformer primary current).

[0165] It should be noted that: because the first power transistor Q1-1 and the second power transistor Q2-1 in the first half-bridge circuit 211, the first power transistor Q1-2 and the second power transistor Q2-2 in the second half-bridge circuit 111, and the first power transistor Q1-3 and the second power transistor Q2-3 in the third half-bridge circuit 112 are complementary in conduction, therefore, Figure 26The diagram only shows the waveforms of the first control signal VQ1-1 corresponding to the first power transistor Q1-1 in the first half-bridge circuit 211, the first control signal VQ1-2 corresponding to the first power transistor Q1-2 in the second half-bridge circuit 111, and the first control signal VQ1-3 corresponding to the first power transistor Q1-3 in the third half-bridge circuit 112.

[0166] Please see Figure 26 , Figure 26 This is a simulation waveform diagram of the vehicle power supply device provided in an embodiment of this application under another application scenario. For example... Figure 26 As shown, when the high-voltage battery HV-BATT is in a charging state and the low-voltage battery BAT is in a non-charging state, the high-voltage DC charging current (i.e., high-voltage DC current) can meet the charging requirements of the high-voltage battery HV-BATT. In other words, the vehicle power supply device 1000 provided in this application embodiment has practical application value.

[0167] in, Figure 26 The diagram also illustrates the waveform of the current corresponding to the high-frequency AC output of the resonant circuit (i.e., the WPT end resonant current).

[0168] It should be noted that: because the first power transistor Q1-2 and the second power transistor Q2-2 in the second half-bridge circuit 111 and the first power transistor Q1-3 and the second power transistor Q2-3 in the third half-bridge circuit 112 are complementary in conduction, therefore, Figure 26 The diagram only shows the waveforms of the first control signal VQ1-2 corresponding to the first power transistor Q1-2 in the second half-bridge circuit 111 and the first control signal VQ1-3 corresponding to the first power transistor Q1-3 in the third half-bridge circuit 112.

[0169] In this circuit, the first half-bridge circuit 211 is in a non-operating state, that is, the first power transistor Q1-1 and the second power transistor Q2-1 in the first half-bridge circuit 211 are both in a turned-off state. In other words, the first control signal VQ1-1 corresponding to the first power transistor Q1-1 and the first control signal VQ2-1 corresponding to the second power transistor Q2-1 in the first half-bridge circuit 211 are always kept at a low level.

[0170] Please see Figure 27 , Figure 27 This is a simulated waveform diagram of the vehicle-mounted power supply device provided in an embodiment of this application under one application scenario. For example... Figure 27 As shown, when the high-voltage battery HV-BATT is in a non-charging state and the low-voltage battery BAT is in a charging state, the low-voltage DC charging current (i.e., low-voltage DC current) can meet the charging needs of the low-voltage battery BAT or the low-voltage load. In other words, the vehicle power supply device 1000 provided in this application embodiment has practical application value.

[0171] in, Figure 27 The diagram also illustrates the waveform of the primary current of the transformer (i.e., the primary current of a DC-DC transformer).

[0172] It should be noted that: because the first power transistor Q1-1 and the second power transistor Q2-1 in the first half-bridge circuit 211 and the first power transistor Q1-2 and the second power transistor Q2-2 in the second half-bridge circuit 111 are complementary in conduction, therefore, Figure 27 The diagram only shows the waveforms of the first control signal VQ1-1 corresponding to the first power transistor Q1-1 in the first half-bridge circuit 211 and the first control signal VQ1-2 corresponding to the first power transistor Q1-2 in the second half-bridge circuit 111.

[0173] In this circuit, the third half-bridge circuit 112 is in a non-operating state. That is, the first power transistor Q1-3 and the second power transistor Q2-3 in the third half-bridge circuit 112 are both in a turned-off state. Therefore, the first control signal VQ1-3 corresponding to the first power transistor Q1-3 and the first control signal VQ2-3 corresponding to the second power transistor Q2-3 in the third half-bridge circuit 112 are always kept at a low level.

[0174] It should be understood that although the steps in the above flowcharts are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the above flowcharts may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the sub-steps or stages of other steps.

[0175] It should be noted that, in the embodiments of this application, if the above-described methods are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to related technologies, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause an electronic device to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), magnetic disks, or optical disks. Thus, the embodiments of this application are not limited to any specific hardware and software combination.

[0176] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.

[0177] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.

[0178] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0179] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple modules or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or modules can be electrical, mechanical, or other forms.

[0180] The modules described above as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules. They may be located in one place or distributed across multiple network units. Some or all of the modules may be selected to achieve the purpose of this embodiment according to actual needs.

[0181] In addition, each functional module in the various embodiments of this application can be integrated into one processing unit, or each module can be a separate unit, or two or more modules can be integrated into one unit; the integrated modules can be implemented in hardware or in the form of hardware plus software functional units.

[0182] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.

[0183] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vehicle-mounted power supply device, characterized in that, The vehicle power supply device includes: a wireless charging receiving circuit and a first half-bridge circuit; the wireless charging receiving circuit is connected to the first half-bridge circuit. The wireless charging receiving circuit includes a first rectifier circuit, which includes a second half-bridge circuit and a third half-bridge circuit. The output terminals of the second half-bridge circuit and the third half-bridge circuit are respectively connected to the output terminal of the first half-bridge circuit; The wireless charging receiving circuit is configured to be coupled to the wireless charging pile via electromagnetic induction, receive the electrical energy transmitted by the wireless charging pile, and convert it into high-voltage direct current. The high-voltage direct current is used to charge the high-voltage battery in the mobile device. The first half-bridge circuit and the second half-bridge circuit are configured to receive the high-voltage direct current and invert the high-voltage direct current into alternating current, which is used to charge the low-voltage battery in the mobile device when converted into low-voltage direct current.

2. The vehicle-mounted power supply device according to claim 1, characterized in that, When both the high-voltage battery and the low-voltage battery are in a charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in a working state; wherein, in the working state, the first power transistor and the second power transistor in each of the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are complementaryly turned on. When the high-voltage battery is in the charging state and the low-voltage battery is in the non-charging state, both the second half-bridge circuit and the third half-bridge circuit are in the operating state, and the first half-bridge circuit is in the non-operating state; wherein, in the non-operating state, both the first power transistor and the second power transistor are in the off state. When the high-voltage battery is in the non-charging state and the low-voltage battery is in the charging state, the first half-bridge circuit and the second half-bridge circuit are both in the working state, and the third half-bridge circuit is in the non-working state. When both the high-voltage battery and the low-voltage battery are in the non-charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in the non-operating state.

3. The vehicle-mounted power supply device according to claim 1, characterized in that, The on-board power supply device also includes: a transformer; The primary side of the transformer is connected to the midpoint of the first half-bridge circuit and the midpoint of the second half-bridge circuit, respectively. The transformer is configured to transmit the AC power to the secondary side of the transformer when the high-voltage direct current is inverted into the AC power through the first half-bridge circuit and the second half-bridge circuit.

4. The vehicle-mounted power supply device according to claim 3, characterized in that, The vehicle-mounted power supply device also includes: a rectifier and filter circuit; The input terminal of the rectifier and filter circuit is connected to the secondary side of the transformer, and the output terminal of the rectifier and filter circuit and the secondary side of the transformer are both connected to the low-voltage battery. The rectifier and filter circuit is configured to rectify and filter the AC power into the low-voltage DC power.

5. The vehicle-mounted power supply device according to claim 4, characterized in that, The rectifier-filter circuit includes a second rectifier circuit and a first filter circuit; the input terminal of the second rectifier circuit is the input terminal of the rectifier-filter circuit, and the output terminal of the first filter circuit is the output terminal of the rectifier-filter circuit. The input terminal of the second rectifier circuit is connected to the secondary side of the transformer, the output terminal of the second rectifier circuit is connected to the input terminal of the first filter circuit, and the output terminal of the first filter circuit is connected to the low-voltage battery. The second rectifier circuit is configured to rectify the AC power into rectified AC power; The first filter circuit is configured to filter the rectified AC power into the low-voltage DC power.

6. The vehicle-mounted power supply device according to claim 5, characterized in that, The second rectifier circuit includes: a first diode and a second diode; the anodes of the first diode and the second diode are both input terminals of the second rectifier circuit, and the cathodes of the first diode and the second diode are both output terminals of the second rectifier circuit. The positive terminals of the first diode and the second diode are both connected to the secondary side of the transformer, and the negative terminals of the first diode and the second diode are both connected to the input terminal of the first filter circuit.

7. The vehicle-mounted power supply device according to claim 5, characterized in that, The first filter circuit includes: a first inductor, a first capacitor, and a first resistor; the first end of the first inductor is the input end of the first filter circuit, and the second end of the first inductor, the first end of the first resistor, and the second plate of the first capacitor are all output ends of the first filter circuit. The first end of the first inductor is connected to the output end of the second rectifier circuit, and the second end of the first inductor, the first end of the first resistor, and the second plate of the first capacitor are all connected to the low-voltage battery. The second end of the first resistor is connected to the first plate of the first capacitor.

8. The vehicle-mounted power supply device according to claim 1, characterized in that, Each of the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit includes: a first power transistor and a second power transistor. The drain terminal of the first power transistor is the positive output terminal of the half-bridge circuit, and the source terminal of the second power transistor is the negative output terminal of the half-bridge circuit. The source terminal of the first power transistor and the drain terminal of the second power transistor are connected. The midpoint of the half-bridge circuit is located between the source terminal of the first power transistor and the drain terminal of the second power transistor. The gate terminals of both the first and second power transistors are connected to a first control signal. The first control signal is used to control the power transistors to turn on or off. The output terminals of the half-bridge circuit include the positive output terminal and the negative output terminal of the half-bridge circuit.

9. The vehicle-mounted power supply device according to any one of claims 1-8, characterized in that, The wireless charging receiving circuit also includes: a receiving coil and a resonant circuit; The receiving coil is connected to the resonant circuit, and the resonant circuit is also connected to the input terminal of the first rectifier circuit. The receiving coil is configured to be coupled to the wireless charging pile via electromagnetic induction to receive electrical energy transmitted by the wireless charging pile. The resonant circuit is configured to compensate for the electrical energy transmitted by the wireless charging pile to obtain high-frequency AC power, and transmit the high-frequency AC power to the first rectifier circuit to rectify the high-frequency AC power to obtain rectified high-frequency AC power.

10. The vehicle-mounted power supply device according to claim 9, characterized in that, The resonant circuit includes: a second inductor, a second capacitor, and a third capacitor; The first plate of the second capacitor is connected to the receiving coil, the second plate of the second capacitor is connected to the first end of the second inductor and the first plate of the third capacitor, and the second end of the second inductor and the second plate of the third capacitor are both connected to the input terminal of the first rectifier circuit.

11. The vehicle-mounted power supply device according to claim 9, characterized in that, The wireless charging receiver circuit further includes: a second filter circuit; The input terminal of the second filter circuit is connected to the output terminal of the first rectifier circuit, and the output terminal of the second filter circuit is connected to the high-voltage battery. The second filter circuit is configured to filter the rectified high-frequency AC power to obtain the high-voltage DC power.

12. The vehicle-mounted power supply device according to claim 11, characterized in that, The second filter circuit includes a third inductor, a fourth capacitor, and a fifth capacitor; the first terminal of the third inductor, the first plate of the fourth capacitor, the second plate of the fourth capacitor, and the second plate of the fifth capacitor are all input terminals of the second filter circuit, and the second terminal of the third inductor and the first plate of the fifth capacitor are both output terminals of the second filter circuit. The first terminal of the third inductor, the first plate of the fourth capacitor, the second plate of the fourth capacitor, and the second plate of the fifth capacitor are all connected to the output terminal of the first rectifier circuit, and the second terminal of the third inductor and the first plate of the fifth capacitor are all connected to the high-voltage battery.

13. A mobile device, characterized in that, include: High-voltage storage battery, low-voltage storage battery, and vehicle power supply device as described in any one of claims 1-12; Both the high-voltage battery and the low-voltage battery are connected to the vehicle power supply device. The on-board power supply is configured to charge the high-voltage battery and the low-voltage battery respectively.

14. A vehicle-mounted power supply system, characterized in that, include: Wireless charging station and vehicle power supply device as described in any one of claims 1-12; The wireless charging station is configured to transmit wireless power to the vehicle power supply unit via electromagnetic induction coupling.

15. A control method, characterized in that, The method is applied to the vehicle power supply device as described in any one of claims 1-12, and the method includes: The wireless charging receiving circuit is coupled to the wireless charging pile through electromagnetic induction, receives the electrical energy transmitted by the wireless charging pile, and converts it into high-voltage direct current. The high-voltage direct current is used to charge the high-voltage battery in the mobile device. The first half-bridge circuit and the second half-bridge circuit receive the high-voltage direct current and invert the high-voltage direct current into alternating current. The alternating current is used to charge the low-voltage battery in the mobile device when it is converted into low-voltage direct current.

16. The control method according to claim 15, characterized in that, The method further includes: When both the high-voltage battery and the low-voltage battery are in a charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in a working state; wherein, in the working state, the first power transistor and the second power transistor in each of the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are complementaryly turned on. When the high-voltage battery is in the charging state and the low-voltage battery is in the non-charging state, both the second half-bridge circuit and the third half-bridge circuit are in the operating state, and the first half-bridge circuit is in the non-operating state; wherein, in the non-operating state, both the first power transistor and the second power transistor are in the off state. When the high-voltage battery is in the non-charging state and the low-voltage battery is in the charging state, the first half-bridge circuit and the second half-bridge circuit are both in the working state, and the third half-bridge circuit is in the non-working state. When both the high-voltage battery and the low-voltage battery are in the non-charging state, the first half-bridge circuit, the second half-bridge circuit, and the third half-bridge circuit are all in the non-operating state.

17. The control method according to claim 16, characterized in that, The method further includes: When both the high-voltage battery and the low-voltage battery are in the charging state, the magnitude of the low-voltage DC current is controlled by controlling the duration for which the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit are simultaneously turned on, and the magnitude of the high-voltage DC current is controlled by controlling the duration for which the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit are simultaneously turned on. When the high-voltage battery is in the charging state and the low-voltage battery is in the non-charging state, the magnitude of the high-voltage direct current is controlled by controlling the duration for which the first power transistor in the second half-bridge circuit and the first power transistor in the third half-bridge circuit are simultaneously turned on. When the high-voltage battery is in the non-charging state and the low-voltage battery is in the charging state, the magnitude of the low-voltage DC current is controlled by controlling the duration for which the first power transistor in the first half-bridge circuit and the first power transistor in the second half-bridge circuit are simultaneously turned on.

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