An all-in-one power supply device, an all-in-one powertrain and an electric vehicle

Abstract

An all-in-one power supply device, an all-in-one powertrain, and an electric vehicle are disclosed, relating to the field of new energy vehicle technology. The power conversion circuit in the all-in-one power supply device includes a primary-side bridge arm circuit, a first transformer, and a secondary-side bridge arm circuit. The primary-side bridge arm circuit includes two bridge arms, the midpoints of which are respectively used to connect to both ends of the primary winding of the first transformer. The secondary-side bridge arm circuit includes a first bridge arm, a second bridge arm, and a third bridge arm. The midpoint of the first bridge arm is used to connect to one end of the secondary winding of the first transformer; the midpoint of the second bridge arm is used to connect to the other end of the secondary winding of the first transformer and one end of the rotor winding of the electrically excited motor via a first switching unit; the midpoint of the third bridge arm is used to connect to the other end of the rotor winding. Thus, the secondary-side bridge arm circuit has the function of supplying power to the rotor winding, eliminating the need for an additional power supply circuit for the rotor winding and reducing the circuit complexity of the electrically excited motor.

Description

Technical Field

[0001] This application relates to the field of new energy vehicle technology, and in particular to an all-in-one power supply device, an all-in-one powertrain, and an electric vehicle. Background Technology

[0002] With the increasing popularity of electric vehicles and the development of intelligent driving technology, users are paying more and more attention to the high-speed cruising range achievement rate of electric vehicles, that is, the actual driving range of electric vehicles. When an electric vehicle is running at high speed, the permanent magnet motor needs to operate in a weak magnetic field condition, which causes some stator current to not do work, reducing the power factor and thus reducing the powertrain efficiency, resulting in a lower high-speed cruising range achievement rate. Compared with the permanent magnet motor, the electrically excited motor can adjust the rotor's magnetic field strength in real time, and does not need to operate in a weak magnetic field condition at high speeds, which can improve the powertrain efficiency and effectively improve the high-speed cruising range achievement rate.

[0003] However, compared to permanent magnet motors, electrically excited motors have higher circuit complexity. Therefore, there is an urgent need to provide a way to reduce the circuit complexity of excitation motors. Summary of the Invention

[0004] This application provides an all-in-one power supply device, an all-in-one powertrain, and an electric vehicle for reducing the circuit complexity of an electrically excited motor.

[0005] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0006] In a first aspect, a multi-functional power supply device is provided. This device receives AC power output from an AC charging pile and converts the AC power into DC power to charge a power battery. It also receives DC power output from the power battery through a power conversion circuit to power the rotor windings of an electrically excited motor. The multi-functional power supply device includes: at least one circuit board for carrying electrical components of the power conversion circuit; and a housing for accommodating the at least one circuit board. The housing also includes a power battery interface for connecting the power battery, through which the multi-functional power supply device charges the power battery or receives power from the power battery. The power conversion circuit includes a primary side bridge arm circuit, a first transformer, and a secondary side bridge arm circuit. The primary-side bridge arm circuit includes two bridge arms, the midpoints of which are used to connect the two ends of the primary winding of the first transformer, respectively. The secondary-side bridge arm circuit includes a first bridge arm, a second bridge arm, and a third bridge arm. The midpoint of the first bridge arm is used to connect one end of the secondary winding of the first transformer. The midpoint of the second bridge arm is used to connect the other end of the secondary winding of the first transformer and one end of the rotor winding through the first switching unit. The midpoint of the third bridge arm is used to connect the other end of the rotor winding.

[0007] In the above technical solution, the two ends of the three arms in the secondary arm circuit are connected to the two ends of the power battery through the power battery interface. The midpoints of the first and second arms are connected to the two ends of the secondary winding of the first transformer, forming a charging circuit for the power battery. The midpoints of the second and third arms are connected to the two ends of the rotor winding, forming a rotor power supply circuit for the electrically excited motor. Based on these two different circuits, the multi-function power supply device can both charge the power battery and supply power to the rotor winding of the electrically excited motor. When the AC charging pile is connected to the charging port of the electric vehicle and supplies power to the electric vehicle, the multi-function power supply device can receive AC power through the AC interface, convert it to DC power, and then transmit it to the power battery through the secondary arm circuit to achieve the function of charging the power battery. During the operation of the electric vehicle, the secondary arm circuit can receive the DC power output from the power battery through the power battery interface and transmit it to the rotor winding of the electrically excited motor, thereby achieving the function of supplying power to the rotor winding. When direct current flows through the rotor windings, the magnetic field generated by the magnetic poles on the stator windings induces an electromotive force in the rotor windings, driving the rotor to rotate and providing propulsion for the electric vehicle. Thus, there is no need for a separate rotor winding power supply circuit; by reusing the secondary bridge arm circuit in a multi-functional power supply device, the rotor windings of the electrically excited motor can be powered, thereby reducing the number of components in the electrically excited motor and lowering its circuit complexity.

[0008] In any possible implementation of the first aspect, the third arm of the secondary bridge arm circuit includes a first capacitor and a second capacitor connected in series. In the above possible technical solutions, when the third bridge arm includes a first capacitor and a second capacitor connected in series, the third bridge arm and the second bridge arm can constitute a half-bridge circuit. Since the half-bridge circuit only needs to control two switching transistors, the requirements for the driving circuits of the switching transistors are lower, which can further reduce the circuit complexity of the all-in-one power supply device.

[0009] In any possible implementation of the first aspect, the first switching unit is used to connect or disconnect the connection between one end of the secondary winding of the first transformer and the midpoint of the second bridge arm, and to connect or disconnect the connection between the midpoint of the second bridge arm and one end of the rotor winding of the electrically excited motor. In the above possible technical solutions, by controlling the operating state of the first switching unit, the connection relationship between the secondary bridge arm circuit and the secondary winding and rotor winding of the first transformer can be controlled, thereby enabling the multi-function power supply device to meet different usage requirements through different operating states. For example, during the charging process of the power battery, the first switching unit connects the connection between one end of the secondary winding of the first transformer and the midpoint of the second bridge arm; during the power supply process of the rotor winding, the first switching unit connects the connection between the midpoint of the second bridge arm and one end of the rotor winding of the electrically excited motor.

[0010] In any possible implementation of the first aspect, the all-in-one power supply device further includes a power factor correction circuit. During the charging process of the power conversion circuit to the power battery, the first switching unit connects the midpoint of the second bridge arm to one end of the secondary winding of the first transformer and disconnects the midpoint of the second bridge arm to one end of the rotor winding. The power factor correction circuit is used to convert the AC power output from the AC charging pile into DC power. The power conversion circuit is used to perform voltage conversion on the DC power output from the power factor correction circuit and charge the power battery through the power battery interface. In the above possible technical solutions, the first switching unit connects the midpoint of the second bridge arm to one end of the secondary winding of the first transformer and disconnects the midpoint of the second bridge arm to one end of the rotor winding, that is, only the charging circuit of the power battery is connected, and the circuit for power supply from the power battery to the rotor winding of the electrically excited motor is disconnected. After the power factor correction circuit converts the AC power output from the AC charging pile into DC power, the power conversion circuit can transmit the DC power to the power battery through the power battery interface to achieve the purpose of charging the power battery. This avoids the power battery discharging to the rotor winding during the charging process, further ensuring the safety of electric vehicles during charging.

[0011] In any possible implementation of the first aspect, during the process of the all-in-one power supply device receiving DC power from the power battery through the power conversion circuit to supply power to the rotor winding, the first switching unit connects the midpoint of the second arm of the secondary bridge arm circuit to the rotor winding of the electrically excited motor and disconnects the connection between the midpoint of the second arm and one end of the secondary winding of the first transformer. The midpoints of the second and third arms supply power to the rotor winding. In the above possible technical solutions, the first switching unit connects the midpoint of the second arm of the secondary bridge arm circuit to the rotor winding of the electrically excited motor and disconnects the connection between the midpoint of the second arm and one end of the secondary winding of the first transformer, that is, only the power supply circuit of the rotor winding is connected, and the charging circuit of the power battery is disconnected. The second and third bridge arms receive DC power output from the power battery at both ends, and after voltage conversion, transmit the converted DC power to the rotor winding through the midpoint of the second and third bridge arms, thereby achieving the purpose of supplying power to the rotor winding.

[0012] In any possible implementation of the first aspect, the multi-function power supply device further includes a DC-DC converter circuit. This DC-DC converter circuit is used to step down the DC power output from the power battery, or it is used to step down the DC power output from the power conversion circuit during the charging process of the power battery by the multi-function power supply device. In the above possible technical solutions, during the charging process of the power battery, or during the power battery supply process, the DC-DC converter circuit can step down the received DC power to output a matching DC power to the vehicle-mounted electrical equipment, external electrical equipment, or the vehicle's small battery, thereby achieving the function of supplying power to the vehicle-mounted electrical equipment and external electrical equipment, or charging the vehicle's small battery.

[0013] In any possible implementation of the first aspect, the DC-DC converter circuit includes a second transformer and a secondary circuit. The two ends of the primary winding of the second transformer are respectively connected to the midpoints of the first and third arms of the secondary bridge arm circuit, and the secondary winding of the second transformer is used to supply power to the secondary circuit. In the above possible technical solutions, by connecting the two ends of the primary winding of the second transformer to the midpoints of the first and third arms of the secondary bridge arm circuit, idle arms can be reused. The first and third arms simultaneously constitute the primary circuit of the second transformer, which can supply power to the primary winding of the second transformer. This saves on electrical components of the second transformer to a certain extent, helps reduce circuit complexity, and improves the integration of the all-in-one power supply device.

[0014] In any possible implementation of the first aspect, the all-in-one power supply device further includes a three-phase inverter circuit, the midpoints of the three arms of which are respectively used to connect the three-phase windings of the stator of the electrically excited motor.

[0015] In any possible implementation of the first aspect, the DC-DC converter circuit includes a second transformer and a secondary circuit. The two ends of the primary winding of the second transformer are respectively used to connect to the midpoint of the third arm of the secondary bridge arm circuit and the midpoint of the midpoint of one phase arm of the three-phase inverter circuit. In the above possible technical solutions, by connecting the two ends of the primary winding of the second transformer to the midpoint of the third arm of the secondary bridge arm circuit and the midpoint of the midpoint of one phase arm of the three-phase inverter circuit, idle bridge arms can be reused. The third arm of the secondary converter circuit and the one phase arm of the three-phase inverter circuit simultaneously constitute the primary circuit of the second transformer, which can supply power to the primary winding of the second transformer. This saves on electrical components of the second transformer to a certain extent, helps reduce circuit complexity, and improves the integration of the all-in-one power supply device.

[0016] In any possible implementation of the first aspect, the DC-DC converter circuit includes a second transformer and a secondary circuit. One end of the primary winding of the second transformer is used to connect to the midpoint of the third bridge arm, and the other end of the primary winding is used to connect, via a second switching unit, the midpoint of the first bridge arm and the midpoint of one phase bridge arm of the three-phase inverter circuit. The secondary winding of the second transformer supplies power to the secondary circuit. In the above possible technical solutions, by controlling the operating state of the second switching unit, the connection relationship between the secondary winding of the second transformer and the first bridge arm of the secondary bridge arm circuit and one phase bridge arm of the three-phase inverter circuit can be controlled, thereby allowing the multi-function power supply device to meet different usage requirements through different operating states. For example, during the charging process of the power battery, the second switching unit connects the connection between one end of the secondary winding of the second transformer and the midpoint of the bridge arm of one phase bridge arm in the three-phase inverter circuit; during the power supply process of the three-phase winding of the stator, the second switching unit connects the connection between one end of the secondary winding of the second transformer and the midpoint of the bridge arm of the first bridge arm.

[0017] In any possible implementation of the first aspect, during the process of the DC-DC converter circuit performing step-down conversion of the DC power output from the power battery, the second switching unit connects the connection between the other end of the primary winding of the second transformer and the midpoint of the first bridge arm, and disconnects the connection between the other end of the primary winding of the second transformer and the midpoint of the bridge arm of one phase of the three-phase inverter circuit. The third bridge arm and one phase of the three-phase inverter circuit are used to supply power to the primary winding of the second transformer. In the above possible technical solutions, during the process of the DC-DC converter circuit performing step-down conversion of the DC power output from the power battery, the electric vehicle may be in a driving state, the secondary bridge arm circuit of the power conversion circuit is in an idle state, and the three-phase inverter circuit is used to supply power to the three-phase winding of the stator. The first bridge arm, which is in an idle state, is reused, and the received DC power is transmitted to the primary winding of the second transformer through the midpoint of the first bridge arm and the midpoint of the third bridge arm. This supplies power to the primary winding of the second transformer, thereby achieving the purpose of supplying power to the load or battery. To a certain extent, this reduces the electrical components of the second transformer, which helps to reduce circuit complexity and improve the integration of the all-in-one power supply device.

[0018] In any possible implementation of the first aspect, during the process of the DC-DC converter circuit performing step-down conversion on the DC output of the power converter circuit, the second switching unit disconnects the connection between the other end of the primary winding of the second transformer and the midpoint of the first bridge arm, and connects the connection between the other end of the primary winding of the second transformer and the midpoint of the bridge arm of one phase of the three-phase inverter circuit. The third bridge arm and the first bridge arm are used to supply power to the primary winding of the second transformer. In the above possible technical solutions, during the process of the DC-DC converter circuit performing step-down conversion on the DC output of the power converter circuit, the electric vehicle may be in a parked state, the three-phase winding of the stator does not need to work, the secondary bridge arm circuit of the power converter circuit is in a working state, and the three-phase inverter circuit is in an idle state. One phase arm of the three-phase inverter circuit that is in an idle state is reused, and the received DC power is transmitted to the primary winding of the second transformer through the midpoint of the third bridge arm and the midpoint of the first phase arm of the three-phase inverter circuit. This supplies power to the primary winding of the second transformer, thereby achieving the purpose of supplying power to the load or battery. To a certain extent, this reduces the electrical components of the second transformer, which is conducive to reducing circuit complexity and improving the integration of the multi-in-one power supply device.

[0019] In any possible implementation of the first aspect, the all-in-one power supply device further includes a control circuit board located within the housing, which controls each switch in the three-phase inverter circuit and each switch in the secondary bridge arm circuit. In the above possible technical solutions, the six switches in the three-phase inverter circuit form a three-phase bridge arm to supply power to the three-phase windings of the stator. Each switch in the secondary bridge arm circuit forms three bridge arms, two of which can also be reused to supply power to the rotor windings of the electrically excited motor. Each switch in the three-phase inverter circuit and each switch in the secondary bridge arm circuit are controlled by the same control circuit board, which not only saves on the size and cost of the control circuit board components but also solves the problem of matching the excitation current of the rotor windings with the current of the three-phase windings of the stator. For example, when the electric vehicle is traveling at high speed, the control circuit board can simultaneously reduce the stator current and simultaneously reduce the rotor current.

[0020] In a second aspect of this application, an all-in-one powertrain is provided, comprising an electrically excited magneto motor and an all-in-one power supply device as described in the first aspect or any possible implementation thereof. The all-in-one power supply device includes a power conversion circuit and a three-phase inverter circuit. The power conversion circuit includes a primary-side bridge arm circuit, a first transformer, and a secondary-side bridge arm circuit. The primary-side bridge arm circuit includes two bridge arms, the midpoints of which are respectively used to connect to both ends of the primary winding of the first transformer. The secondary-side bridge arm circuit includes a first bridge arm, a second bridge arm, and a third bridge arm. The midpoint of the first bridge arm is used to connect to one end of the secondary winding of the first transformer; the midpoint of the second bridge arm is used to connect, via a first switching unit, the other end of the secondary winding of the first transformer and one end of the rotor winding of the electrically excited magneto motor; and the midpoint of the third bridge arm is used to connect to the other end of the rotor winding. The three midpoints of the three bridge arms of the three-phase inverter circuit are respectively used to connect to the three-phase windings of the stator of the electrically excited magneto motor.

[0021] In a third aspect of this application, an electric vehicle is provided, the electric vehicle including a power battery and an all-in-one powertrain as described in the second aspect, the all-in-one powertrain being used to receive alternating current to charge the power battery, or the power battery supplying power to the all-in-one powertrain.

[0022] Understandably, the beneficial effects of the all-in-one powertrain and electric vehicle provided above can be compared with the beneficial effects of the all-in-one power supply device provided above, and will not be repeated here. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an electric vehicle provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the structure of an all-in-one power supply device provided in an embodiment of this application;

[0025] Figure 3 A circuit topology diagram of an all-in-one power supply device provided in an embodiment of this application;

[0026] Figure 4 A schematic diagram of another all-in-one power supply device provided in the embodiments of this application;

[0027] Figure 5 A circuit topology diagram of another all-in-one power supply device provided in the embodiments of this application;

[0028] Figure 6 A schematic diagram of the structure of another all-in-one power supply device provided in the embodiments of this application;

[0029] Figure 7A circuit topology diagram of another all-in-one power supply device provided in the embodiments of this application;

[0030] Figure 8 A schematic diagram of another all-in-one power supply device provided in the embodiments of this application;

[0031] Figure 9 The circuit topology diagram is provided for another all-in-one power supply device according to an embodiment of this application. Detailed Implementation

[0032] The following sections will discuss the fabrication and use of various embodiments in detail. However, it should be understood that many applicable inventive concepts provided in this application can be implemented in a variety of specific environments. The specific embodiments discussed are merely illustrative of specific ways of implementing and using this application and technology, and do not limit the scope of this application.

[0033] Unless otherwise defined, all technical terms used herein have the same meaning as commonly known to one of ordinary skill in the art.

[0034] Before introducing the embodiments of this application, the background technology involved in this application will be introduced first.

[0035] With the increasing popularity of electric vehicles and the development of intelligent driving technology, users are paying more and more attention to the high-speed cruising range achievement rate of electric vehicles, that is, the actual driving range of electric vehicles. When an electric vehicle is running at high speed, the permanent magnet motor needs to operate under a weak magnetic field condition, resulting in some stator current not doing work, a lower power factor, and thus reduced powertrain efficiency, leading to a lower high-speed cruising range achievement rate. In contrast, the rotor current of an electrically excited motor can be adjusted according to the rotational speed, that is, the magnetic field strength of the rotor. At high speeds, the rotor current is smaller, and the stator of the electrically excited motor does not need to operate under a weak magnetic field condition, resulting in a higher power factor, thereby improving powertrain efficiency and effectively improving the high-speed cruising range achievement rate. Furthermore, in a permanent magnet motor, the magnetic poles are generated by permanent magnets, while in an electrically excited motor, the magnetic poles are generated by direct current excitation using the rotor coils (i.e., rotor windings). Since it does not use permanent magnets, the electrically excited motor does not require rare earth materials in its production process, giving it a cost advantage.

[0036] However, compared to permanent magnet motors, electrically excited motors require a separate power supply to drive their rotors, meaning an additional rotor power supply circuit is needed. This results in higher circuit complexity for electrically excited motors. Therefore, it is necessary to reduce the circuit complexity of electrically excited motors to further reduce their production costs.

[0037] To address the aforementioned technical problems, embodiments of this application provide an all-in-one power supply device, an all-in-one powertrain, and an electric vehicle. The all-in-one power supply device provided in this application can not only receive AC power output from an AC charging pile and convert it into DC power to charge the power battery, but also receive DC power output from the power battery through a power conversion circuit to power the rotor windings of an electrically excited motor. This eliminates the need for a separate power supply circuit for the rotor windings of the electrically excited motor in the electric vehicle, thus simplifying the circuit complexity of the electrically excited motor to a certain extent.

[0038] Figure 1 This is a schematic diagram of an electric vehicle 01 provided in an embodiment of this application. Figure 1 As shown, the electric vehicle 01 includes a power battery 10 and a multi-functional powertrain 20. The multi-functional powertrain 20 includes a multi-functional power supply device 30 and an electrically excited motor 40. During charging, the multi-functional power supply device 30 converts the received AC power into DC power to charge the power battery 10. During operation, the multi-functional power supply device 30 supplies the output of the power battery 10 to the electrically excited motor 40 to drive the electric vehicle 01. The electrically excited motor 40 includes a fixed stator winding and a rotatable rotor winding. Pairs of magnetic poles are arranged on the stator winding, each pair of poles being positioned relative to the rotor winding. When a DC current is applied to the rotor winding, the magnetic field generated by the magnetic poles on the stator winding induces an electromotive force in the rotor winding, driving the rotor to rotate and providing driving force for the electric vehicle 01.

[0039] The technical solutions provided in the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0040] Figure 2 The structure of an all-in-one power supply device 30 provided in an embodiment of this application is illustrated. Figure 3 Example Figure 2 The circuit topology of the multi-function power supply device 30.

[0041] In one embodiment, such as Figure 2 As shown, the all-in-one power supply device 30 includes at least one circuit board ( Figure 2 (Not shown in the image) housing 32 and power conversion circuit 31, the at least one circuit board is used to carry the electrical components of the power conversion circuit 31, and the housing 32 is used to house the at least one circuit board.

[0042] In one embodiment, the all-in-one power supply device 30 further includes a power factor correction circuit 34. The electrical components of the power factor correction circuit 34 and the electrical components of the power conversion circuit 31 are integrated on the same circuit board, or the electrical components of the power factor correction circuit 34 and the electrical components of the power conversion circuit 31 are separately integrated on two circuit boards, both of which are located within the housing 32.

[0043] The aforementioned electrical components include power devices, resistors, capacitors, and transformers. The power device can be a metal-oxide-semiconductor field-effect transistor (MOSFET), also simply referred to as a MOS transistor, each including a reverse-biased body diode. Alternatively, the power device can also include an insulated-gate bipolar transistor (IGBT) and a diode D, with the collector of the IGBT connected to the cathode of the diode D, and the emitter of the IGBT connected to the anode of the diode D.

[0044] like Figure 2 As shown, the housing 32 also includes a power battery 10 interface for connecting the power battery 10. The multi-function power supply device 30 can charge the power battery 10 or receive power from the power battery 10 through this power battery 10 interface. The housing 32 also includes an AC interface for receiving AC power. The multi-function power supply device 30 can receive AC power input from an AC charging pile through this AC interface, or output AC power to other AC devices through this AC interface.

[0045] In one embodiment, such as Figure 2 and Figure 3 As shown, the power conversion circuit 31 includes a primary-side bridge arm circuit 311, a first transformer 312, and a secondary-side bridge arm circuit 313. The primary-side bridge arm circuit 311 includes two arms, the midpoints of which are used to connect to the two ends of the primary winding of the first transformer 312. The secondary-side bridge arm circuit 313 includes a first arm, a second arm, and a third arm. The midpoint of the first arm is used to connect to one end of the secondary winding of the first transformer 312; the midpoint of the second arm is used to connect to the other end of the secondary winding of the first transformer 312 and one end of the rotor winding 41 via the first switching unit 33; and the midpoint of the third arm is used to connect to the other end of the rotor winding 41.

[0046] In one example, each of the primary side bridge arm circuit 311 and the secondary side bridge arm circuit 313 includes an upper bridge arm switch and a lower bridge arm switch, and the connection point between the upper bridge arm switch and the lower bridge arm switch is the midpoint of a bridge arm.

[0047] In another example, the third arm of the aforementioned secondary bridge arm circuit 313 includes a first capacitor C1 and a second capacitor C2 connected in series. The connection point of the first capacitor C1 and the second capacitor C2 is the midpoint of the third bridge arm.

[0048] When the third bridge arm includes a series-connected upper bridge arm switch and a series-connected lower bridge arm switch, the third bridge arm and the second bridge arm can form a full-bridge circuit; when the third bridge arm includes a series-connected first capacitor C1 and a second capacitor C2, the third bridge arm and the second bridge arm can form a half-bridge circuit. In practical applications, both half-bridge and full-bridge circuits can achieve voltage conversion. Comparatively, the half-bridge circuit, because it only needs to control two switches, has lower requirements for the switch drive circuit, further reducing the circuit complexity of the all-in-one power supply device 30, thus offering a cost advantage. As an example and not a limitation, this application uses a half-bridge circuit as an example for illustration.

[0049] like Figure 3 As shown, the primary-side bridge arm circuit 311 includes an upper bridge arm switch Q1, a lower bridge arm switch Q2, an upper bridge arm switch Q3, and a lower bridge arm switch Q4. The midpoint of the bridge arm formed by the series connection of the upper bridge arm switch Q1 and the lower bridge arm switch Q2 is connected to the first end of the primary winding of the first transformer 312 through a first inductor L1. The midpoint of the bridge arm formed by the series connection of the upper bridge arm switch Q3 and the lower bridge arm switch Q4 is connected to the second end of the primary winding of the first transformer 312 through a third capacitor C3. The placement of the first inductor L2 and the third capacitor C3 at both ends of the primary winding of the transformer helps to stabilize the current, reduce harmonics, and improve the power quality passing through the first transformer 312, thereby improving the stability of the multi-in-one power supply device 30.

[0050] The first arm of the aforementioned secondary bridge arm circuit 313 includes an upper bridge arm switch Q5 and a lower bridge arm switch Q6. The midpoint of the bridge arm formed by the series connection of the upper bridge arm switch Q5 and the lower bridge arm switch Q6 is connected to the first end of the secondary winding of the first transformer 312. The second arm of the aforementioned secondary bridge arm circuit 313 includes an upper bridge arm switch Q7 and a lower bridge arm switch Q8. The midpoint of the bridge arm formed by the series connection of the upper bridge arm switch Q7 and the lower bridge arm switch Q8 is connected to the second end of the secondary winding of the first transformer 312 via the first switching unit 33, or connected to the first end of the rotor winding 41 of the electrically excited magneto motor 40 via the first switching unit 33. The midpoint of the third arm of the aforementioned secondary bridge arm circuit 313 is connected to the second end of the rotor winding 41. The aforementioned rotor winding 41 includes a resistor R and a second inductor L2 connected in series. One end of the resistor R is connected to the midpoint of the second bridge arm through the first switching unit 33, and one end of the second inductor L2 is connected to the midpoint of the third bridge arm.

[0051] The power factor correction circuit 34 includes an upper bridge arm switch Q9, a lower bridge arm switch Q10, an upper bridge arm switch Q11, a lower bridge arm switch Q12, an upper bridge arm switch Q13, a lower bridge arm switch Q14, a third inductor L3, and a fourth inductor L4. The midpoint of the bridge arm formed by the series connection of upper bridge arm switch Q9 and lower bridge arm switch Q10 is connected to the first end of the AC interface via the third inductor L3. The midpoint of the bridge arm formed by the series connection of upper bridge arm switch Q11 and lower bridge arm switch Q12 is connected to the first end of the AC interface via the fourth inductor L4. The midpoint of the bridge arm formed by the series connection of upper bridge arm switch Q13 and lower bridge arm switch Q14 is connected to the second end of the AC interface. The power factor correction circuit 34 is used to receive AC power through the AC interface, convert the AC power into DC power, and then transmit it to the power conversion circuit 31. The power factor correction circuit 34 is also used to convert the DC power transmitted by the power conversion circuit 31 into AC power and then output it to other AC devices through the AC interface.

[0052] In one embodiment, such as Figure 3 As shown, the multi-in-one power supply device 30 also includes a fourth capacitor C4 and a fifth capacitor C5. The two ends of the fourth capacitor C4 are respectively connected to the two ends of the bridge arm of the primary side bridge arm circuit 311, and the two ends of the fifth capacitor C5 are respectively connected to the two ends of the bridge arm of the secondary side bridge arm circuit 313. The fourth capacitor C4 and the fifth capacitor C5 are used to filter out noise interference in the current supplying power to the power battery 10, or to filter out noise interference in the current output by the power battery 10, which can effectively improve the stability of the multi-in-one power supply device 30.

[0053] Based on the above technical solution, the two ends of the three arms in the secondary arm circuit 313 are connected to the two ends (HV+ and HV-) of the power battery 10 through the interface of the power battery 10. The midpoints of the first and second arms are connected to the two ends of the secondary winding of the first transformer 312, which can form a charging circuit for the power battery 10. The midpoints of the second and third arms are connected to the two ends of the rotor winding 41, which can form a rotor power supply circuit for the electrically excited motor 40. Based on the two different circuits, the multi-function power supply device 30 can both charge the power battery 10 and supply power to the rotor winding 41 of the electrically excited motor 40. When the AC charging pile is connected to the charging port of the electric vehicle 01 and charging the electric vehicle 01, the multi-function power supply device 30 can receive AC power through the AC interface, convert the AC power into DC power, and then transmit it to the power battery 10 through the secondary arm circuit 313 to realize the function of charging the power battery 10. During the operation of the electric vehicle 01, the secondary bridge arm circuit 313 can receive the DC power output from the power battery 10 through the power battery 10 interface and transmit the DC power to the rotor winding 41 of the electrically excited motor 40, thereby realizing the function of supplying power to the rotor winding 41. After the rotor winding 41 is energized with DC power, the magnetic field generated by the magnetic poles on the stator winding will induce an electromotive force in the rotor winding 41, driving the rotor to rotate and providing driving force for the electric vehicle 01. In this way, there is no need to set up a separate power supply circuit for the rotor winding 41. By reusing the secondary bridge arm circuit 313 in the multi-in-one power supply device 30, the purpose of supplying power to the rotor winding 41 of the electrically excited motor 40 is achieved, thereby saving the number of components in the electrically excited motor 40 and reducing the circuit complexity of the electrically excited motor 40.

[0054] In one embodiment, such as Figure 2 and Figure 3 As shown, the first switching unit 33 is used to connect or disconnect the connection between one end of the secondary winding of the first transformer 312 and the midpoint of the bridge arm of the second bridge arm, and to connect or disconnect the connection between the midpoint of the bridge arm of the second bridge arm and one end of the rotor winding 41 of the electrically excited motor 40.

[0055] In one example, such as Figure 3 As shown, the first switching unit 33 is a single-pole double-throw switch. That is, the first switching unit 33 has one fixed terminal and two select terminals. The fixed terminal of the first switching unit 33 is connected to the midpoint of the second bridge arm of the secondary bridge arm circuit 313, the first select terminal of the first switching unit 33 is connected to one end of the secondary winding of the first transformer 312, and the second select terminal of the first switching unit 33 is connected to one end of the rotor winding 41 of the electrically excited magneto 40.

[0056] When the fixed terminal of the first switching unit 33 is connected to the first selection terminal, the first switching unit 33 conducts the connection between one end of the secondary winding of the first transformer 312 and the midpoint of the second bridge arm, and disconnects the connection between the midpoint of the second bridge arm and one end of the rotor winding 41 of the electrically excited motor 40; when the fixed terminal of the first switching unit 33 is connected to the second selection terminal, the first switching unit 33 conducts the connection between the midpoint of the second bridge arm and one end of the rotor winding 41 of the electrically excited motor 40, and disconnects the connection between one end of the secondary winding of the first transformer 312 and the midpoint of the second bridge arm.

[0057] In another example, the first switching unit 33 includes two switches, one of which is connected between one end of the secondary winding of the first transformer 312 and the midpoint of the second bridge arm, and the other of which is connected between the midpoint of the second bridge arm and one end of the rotor winding 41 of the electrically excited magneto 40.

[0058] When one switch is on, the other switch is off, connecting one end of the secondary winding of the first transformer 312 to the midpoint of the second bridge arm, and disconnecting the midpoint of the second bridge arm from one end of the rotor winding 41 of the electrically excited motor 40; when one switch is off, the other switch is on, connecting one end of the secondary winding of the first transformer 312 to the midpoint of the second bridge arm, and connecting the midpoint of the second bridge arm from one end of the rotor winding 41 of the electrically excited motor 40.

[0059] Based on the above technical solution, by controlling the operating state of the first switching unit 33, the connection relationship between the secondary bridge arm circuit 313 and the secondary winding of the first transformer 312 and the rotor winding 41 can be controlled, thereby enabling the multi-function power supply device 30 to meet different usage requirements through different operating states. For example, during the charging process of the power battery 10, the first switching unit 33 connects one end of the secondary winding of the first transformer 312 and the midpoint of the second bridge arm; during the power supply process of the rotor winding 41, the first switching unit 33 connects the midpoint of the second bridge arm and one end of the rotor winding 41 of the electrically excited motor 40.

[0060] The following is based on Figure 3 Taking the multi-function power supply device 30 shown as an example, the operating status of the multi-function power supply device 30 will be explained in detail.

[0061] In one possible implementation, such as Figure 2 and Figure 3As shown, the aforementioned all-in-one power supply device 30 also includes a power factor correction circuit 34. During the charging process of the power conversion circuit 31 to the power battery 10, the first switching unit 33 connects the connection between the midpoint of the second bridge arm and one end of the secondary winding of the first transformer 312 and disconnects the connection between the midpoint of the second bridge arm and one end of the rotor winding 41. The power factor correction circuit 34 is used to convert the AC power output from the AC charging pile into DC power. The power conversion circuit 31 is used to perform voltage conversion on the DC power output from the power factor correction circuit 34 and charge the power battery 10 through the interface of the power battery 10.

[0062] During the charging process of the power conversion circuit 31 to the power battery 10, the electric vehicle 01 may be in a parked state, and the rotor winding 41 does not need to work. The first switching unit 33 connects the connection between the midpoint of the second bridge arm and one end of the secondary winding of the first transformer 312 and disconnects the connection between the midpoint of the second bridge arm and one end of the rotor winding 41. That is, only the charging circuit of the power battery 10 is connected, and the circuit for power supply from the power battery 10 to the rotor winding 41 of the electrically excited motor 40 is disconnected. After the power factor correction circuit 34 converts the AC power output from the AC charging pile into DC power, the power conversion circuit 31 can transmit the DC power to the power battery 10 through the power battery 10 interface to achieve the purpose of charging the power battery 10. This avoids the power battery 10 discharging to the rotor winding 41 during the charging process, further ensuring the safety of the electric vehicle 01 during charging.

[0063] In another possible implementation, during the process of the multi-in-one power supply device 30 receiving DC power output from the power battery 10 through the power conversion circuit 31 to power the rotor winding 41, the first switching unit 33 connects the connection between the midpoint of the second arm of the secondary arm circuit 313 and the rotor winding 41 of the electrically excited motor 40 and disconnects the connection between the midpoint of the second arm and one end of the secondary winding of the first transformer 312. The midpoints of the second and third arms then supply power to the rotor winding 41.

[0064] While the multi-function power supply unit 30 is supplying power to the rotor winding 41, the electric vehicle 01 may be in motion, and the AC charging pile cannot charge the power battery 10. The first switching unit 33 connects the midpoint of the second arm of the secondary arm circuit 313 to the rotor winding 41 of the electrically excited motor 40 and disconnects the connection between the midpoint of the second arm and one end of the secondary winding of the first transformer 312. That is, only the power supply circuit of the rotor winding 41 is connected, and the charging circuit of the power battery 10 is disconnected. The two ends of the second and third arms receive the DC power output from the power battery 10, and after voltage conversion, the voltage-converted DC power is transmitted to the rotor winding 41 through the midpoint of the second and third arms, thus achieving the purpose of supplying power to the rotor winding 41.

[0065] Figure 4 This example illustrates the structure of another all-in-one power supply device 30 provided in an embodiment of this application. For example... Figure 4 As shown, the multi-function power supply device 30 also includes a DC-DC converter circuit 35, which is used to step down the DC power output from the power battery 10, or to step down the DC power output from the power conversion circuit 31 during the charging process of the multi-function power supply device 30 for the power battery 10.

[0066] In one embodiment, the housing 32 further includes a first interface through which the DC-DC converter circuit 35 connects a load or a battery. The load can be other electrical devices of the electric vehicle 01, such as windshield wipers, headlights, or other in-vehicle electrical devices, or external electrical devices such as mobile phones or tablets. The battery refers to a small storage battery in the electric vehicle 01 other than the power battery 10. The DC-DC converter circuit 35 steps down the DC power output from the power battery 10 or the DC power output from the power conversion circuit 31 and then supplies power to the load or battery through the first interface.

[0067] Based on the above technical solution, during the charging process of the power battery 10 or the power battery 10 supplying power, the DC-DC converter circuit 35 can step down the received DC power to output matching DC power to the vehicle-mounted electrical equipment, external electrical equipment, or vehicle-mounted small battery, thereby realizing the function of supplying power to the vehicle-mounted electrical equipment and external electrical equipment or charging the vehicle-mounted small battery.

[0068] Figure 5 Example Figure 4 The circuit topology of the multi-function power supply device 30.

[0069] In one embodiment, such as Figure 5As shown, the DC-DC converter circuit 35 includes a second transformer T2 and a secondary circuit. The primary winding of the second transformer T2 is used to connect the midpoints of the first and third arms of the secondary bridge arm circuit 313, respectively. The secondary winding of the second transformer T2 is used to supply power to the secondary circuit.

[0070] The aforementioned secondary circuit includes an upper bridge arm switch Q15, a lower bridge arm switch Q16, a fifth inductor L5, and a sixth capacitor C6. In one possible embodiment, the two ends of the upper bridge arm switch Q15 and the lower bridge arm switch Q16 are connected to the two ends of the secondary winding of the second transformer T2. The fifth inductor L5 and the sixth capacitor C6 are connected in series and between the midpoint of the secondary winding of the second transformer T2 and the connection point of the upper bridge arm switch Q15 and the lower bridge arm switch Q16. The voltage across the sixth capacitor C6 is the voltage output by the DC-DC converter circuit 35.

[0071] In one example, one end of the primary winding of the second transformer T2 is connected to the midpoint of the third bridge arm via a seventh capacitor C7, and the other end of the primary winding of the second transformer T2 is connected to the midpoint of the first bridge arm via a switch K. When switch K is on, the other end of the primary winding of the second transformer T2 is connected to the midpoint of the first bridge arm, and the first and third bridge arms of the secondary switching circuit supply power to the primary winding of the second transformer T2. When switch K is off, the other end of the primary winding of the second transformer T2 is disconnected from the midpoint of the first bridge arm, and the first and third bridge arms of the secondary switching circuit do not supply power to the primary winding of the second transformer T2.

[0072] During the process of DC-DC converter circuit 35 performing step-down conversion on DC power output from power battery 10, the first transformer 312 in power conversion circuit 31 is in an idle state. At this time, the first bridge arm in power conversion circuit 31 is also in an idle state. By closing the control switch K, the other end of the primary winding of the second transformer T2 is connected to the midpoint of the first bridge arm. The first bridge arm and the third bridge arm together constitute the primary circuit of the second transformer T2, which can supply power to the primary winding of the second transformer T2. This saves electrical components of the second transformer T2 to a certain extent, which helps to reduce circuit complexity and improve the integration of the multi-in-one power supply device 30.

[0073] During the process of DC-DC converter 35 performing step-down conversion on the DC output of power converter 31, that is, during the charging of power battery 10, the first bridge arm in power converter 31 is in working state, used to convert the current and voltage output to power battery 10. By controlling switch K to disconnect, the other end of the primary winding of the second transformer T2 is disconnected from the midpoint of the first bridge arm, so as to avoid affecting the charging of power battery 10 and improve the safety of power battery 10 during the charging process.

[0074] Figure 6 This example illustrates the structure of yet another all-in-one power supply device 30 provided in an embodiment of this application. Figure 7 for Figure 6 Circuit topology diagram of the multi-functional power supply device 30.

[0075] like Figure 6 As shown, the multi-function power supply device 30 also includes a three-phase inverter circuit 36. The midpoints of the three bridge arms of the three-phase inverter circuit 36 ​​are respectively used to connect to the three-phase windings 42 of the stator of the electrically excited motor 40. The three-phase inverter circuit 36 ​​includes three bridge arms, and the two ends of each bridge arm are used to connect to the two ends of the power battery 10 via interfaces on the housing 32. The three-phase inverter circuit 36 ​​receives the DC power output from the power battery 10 and supplies power to the three-phase windings 42 of the stator to drive the electrically excited motor 40 to rotate.

[0076] like Figure 7 As shown, each phase arm of the three-phase bridge arm includes two switches connected in series with the same freewheeling direction. For example, the first phase arm includes the upper bridge arm switch Q17 and the lower bridge arm switch Q18, the second phase arm includes the upper bridge arm switch Q19 and the lower bridge arm switch Q20, and the third phase arm includes the upper bridge arm switch Q21 and the lower bridge arm switch Q22.

[0077] In another embodiment, such as Figure 7 As shown, the DC-DC converter circuit 35 includes a second transformer T2 and a secondary circuit. The two ends of the primary winding of the second transformer T2 are respectively used to connect the midpoint of the third bridge arm of the secondary bridge arm circuit 313 and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36. By way of example and not limitation, this embodiment uses the third phase bridge arm of the three-phase inverter circuit 36 ​​as an example for illustration.

[0078] In one example, one end of the primary winding of the second transformer T2 is connected to the midpoint of the third bridge arm via the seventh capacitor C7, and the other end of the primary winding of the second transformer T2 is connected to the midpoint of the third phase bridge arm of the three-phase inverter circuit 36 ​​via switch K. When switch K is on, the other end of the primary winding of the second transformer T2 is connected to the midpoint of the third phase bridge arm, and the third bridge arm and the third phase bridge arm of the secondary switching circuit supply power to the primary winding of the second transformer T2. When switch K is off, the other end of the primary winding of the second transformer T2 is disconnected from the midpoint of the third phase bridge arm, and the third bridge arm of the secondary switching circuit and the third phase bridge arm of the three-phase inverter circuit 36 ​​do not supply power to the primary winding of the second transformer T2.

[0079] During the process of DC-DC converter circuit 35 performing step-down conversion on the DC output of power converter circuit 31, that is, during the charging of power battery 10, the three-phase bridge arms in three-phase inverter circuit 36 ​​are all in an idle state. By closing the control switch K, the other end of the primary winding of the second transformer T2 is connected to the midpoint of the bridge arm of the third phase bridge arm. The third phase bridge arm and the third bridge arm together constitute the primary circuit of the second transformer T2, which can supply power to the primary winding of the second transformer T2. To a certain extent, this saves electrical components of the second transformer T2, which helps to reduce circuit complexity and improve the integration of the multi-in-one power supply device 30.

[0080] During the process of DC-DC converter circuit 35 performing step-down conversion on the DC power output from power battery 10, the three-phase bridge arm in three-phase inverter circuit 36 ​​may be in an idle state. For example, when driving, three-phase inverter circuit 36 ​​is used to supply power to the three-phase winding 42 of the stator of electric exciter motor 40. By controlling switch K to disconnect, the other end of the primary winding of the second transformer T2 is disconnected from the midpoint of the bridge arm of three-phase inverter circuit 36, so as to avoid affecting the three-phase inverter circuit 36 ​​driving electric exciter motor 40 and improve the driving safety of electric vehicle 01.

[0081] In one possible embodiment, the all-in-one power supply unit 30 also includes a control circuit board (not shown) located within the housing 32, which controls each switch in the three-phase inverter circuit 36 ​​and each switch in the secondary bridge arm circuit 313.

[0082] The control circuit board can be a chip. For example, the control circuit board can be a field programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system-on-chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0083] As described above, the six switches in the three-phase inverter circuit 36 ​​form a three-phase bridge arm to supply power to the three-phase windings 42 of the stator. Each switch in the secondary bridge arm circuit 313 forms three bridge arms, two of which can also be reused to supply power to the rotor windings 41 of the electrically excited motor 40. Each switch in the three-phase inverter circuit 36 ​​and each switch in the secondary bridge arm circuit 313 is controlled by the same control circuit board. This not only saves on the size and cost of the control circuit board components but also solves the problem of matching the excitation current of the rotor windings 41 with the current of the three-phase windings 42 of the stator. For example, when the electric vehicle 01 is traveling at high speed, the control circuit board can simultaneously reduce the stator current and the rotor current.

[0084] In another embodiment, the function of the control circuit board described above can also be implemented by the vehicle control unit (VCU) in the electric vehicle 0101, and this application embodiment does not impose specific limitations on this.

[0085] Figure 8 The structure of another all-in-one power supply device 30 provided in the embodiments of this application is illustrated. Figure 9 for Figure 8 Circuit topology diagram of the multi-functional power supply device 30.

[0086] like Figure 8 and Figure 9As shown, the DC-DC converter circuit 35 includes a second transformer T2 and a secondary circuit. One end of the primary winding of the second transformer T2 is used to connect to the midpoint of the third bridge arm, and the other end of the primary winding of the second transformer T2 is used to connect, via the second switching unit 37, to the midpoint of the first bridge arm and the midpoint of one phase of the three-phase inverter circuit 36. The secondary winding of the second transformer T2 is used to supply power to the secondary circuit.

[0087] The circuit structure of the secondary circuit is the same as that in the previous embodiment, and will not be described again here.

[0088] In one example, such as Figure 9 As shown, the second switching unit 37 is a single-pole double-throw switch. That is, the second switching unit 37 has one fixed terminal and two select terminals. The fixed terminal of the second switching unit 37 is connected to one end of the primary winding of the second transformer T2, the first select terminal of the second switching unit 37 is connected to the midpoint of the first bridge arm of the secondary bridge arm circuit 313, and the second select terminal of the second switching unit 37 is connected to the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36.

[0089] When the fixed terminal of the second switching unit 37 is connected to the first selection terminal, the second switching unit 37 connects one end of the primary winding of the second transformer T2 to the midpoint of the first bridge arm of the secondary bridge arm circuit 313, and disconnects one end of the primary winding of the second transformer T2 from the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36; when the fixed terminal of the second switching unit 37 is connected to the second selection terminal, the second switching unit 37 connects one end of the primary winding of the second transformer T2 to the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36, and disconnects one end of the primary winding from the midpoint of the bridge arm of the first bridge arm of the secondary bridge arm circuit 313.

[0090] In another example, the second switching unit 37 includes two switches, one of which is connected between one end of the primary winding of the second transformer T2 and the midpoint of the first arm of the secondary arm circuit 313, and the other of which is connected between one end of the primary winding of the second transformer T2 and the midpoint of the arm of one phase of the three-phase inverter circuit 36.

[0091] When one switch is on, the other switch is off. One end of the primary winding of the second transformer T2 is connected to the midpoint of the first bridge arm of the secondary bridge arm circuit 313, and one end of the primary winding of the second transformer T2 is disconnected from the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36. When one switch is off, the other switch is on. One end of the primary winding of the second transformer T2 is disconnected from the midpoint of the first bridge arm of the secondary bridge arm circuit 313, and one end of the primary winding of the second transformer T2 is connected to the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36.

[0092] Based on the above technical solution, by controlling the operating state of the second switching unit 37, the connection between the secondary winding of the second transformer T2 and the first bridge arm of the secondary bridge arm circuit 313 and one phase bridge arm of the three-phase inverter circuit 36 ​​can be controlled, thereby enabling the multi-function power supply device 30 to meet different usage requirements through different operating states. For example, during the charging process of the power battery 10, the second switching unit 37 connects one end of the secondary winding of the second transformer T2 and the midpoint of the bridge arm of one phase bridge arm in the three-phase inverter circuit 36; during the power supply process of the three-phase winding 42 of the stator, the second switching unit 37 connects one end of the secondary winding of the second transformer T2 and the midpoint of the bridge arm of the first bridge arm.

[0093] The following is based on Figure 9 Taking the all-in-one power supply device 30 shown as an example, the operating status of the all-in-one power supply device 30 will be explained in detail.

[0094] In one example, during the process of the DC-DC converter circuit 35 performing step-down conversion on the DC power output from the power battery 10, the second switching unit 37 connects the connection between the other end of the primary winding of the second transformer T2 and the midpoint of the first bridge arm, and disconnects the connection between the other end of the primary winding of the second transformer T2 and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36. The third bridge arm and one phase of the three-phase inverter circuit 36 ​​are used to supply power to the primary winding of the second transformer T2.

[0095] During the process of DC-DC converter circuit 35 performing step-down conversion on the DC power output from power battery 10, electric vehicle 01 may be in a driving state, the secondary bridge arm circuit 313 of power conversion circuit 31 is in an idle state, and three-phase inverter circuit 36 ​​is used to supply power to the three-phase winding 42 of the stator. The second switching unit 37 connects the other end of the primary winding of the second transformer T2 and the midpoint of the first bridge arm, and disconnects the other end of the primary winding of the second transformer T2 and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36, that is, disconnects the connection with the three-phase inverter circuit 36, and only connects the connection with the first bridge arm of the secondary bridge arm circuit 313. The first and third bridge arms receive DC power output from the power battery 10 at both ends, and after voltage conversion, transmit the converted DC power to the primary winding of the second transformer T2 through the midpoint of the first and third bridge arms, thereby supplying power to the primary winding of the second transformer T2 and thus achieving the purpose of supplying power to the load or the battery.

[0096] In the second example, during the process of the DC-DC converter circuit 35 performing step-down conversion on the DC output of the power converter circuit 31, the second switching unit 37 disconnects the connection between the other end of the primary winding of the second transformer T2 and the midpoint of the first bridge arm, and connects the other end of the primary winding of the second transformer T2 and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36. The third bridge arm and the first bridge arm are used to supply power to the primary winding of the second transformer T2.

[0097] During the process of DC-DC converter circuit 35 stepping down the DC output of power converter circuit 31, electric vehicle 01 may be in a parked state, the three-phase winding 42 of the stator does not need to work, the secondary bridge arm circuit 313 of power converter circuit 31 is in a working state, and the three-phase inverter circuit 36 ​​is in an idle state. The second switching unit 37 connects the other end of the primary winding of the second transformer T2 and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36 ​​and disconnects the other end of the primary winding of the second transformer T2 and the midpoint of the bridge arm of the first bridge arm. That is, it only connects to the three-phase inverter circuit 36 ​​and disconnects from the first bridge arm of the secondary bridge arm circuit 313. The third bridge arm and the two ends of the bridge arm of the three-phase inverter circuit 36 ​​receive the DC power transmitted from the power conversion circuit 31 to the power battery 10, and after voltage conversion of the DC power, the voltage-converted DC power is transmitted to the primary winding of the second transformer T2 through the midpoint of the bridge arm of the third bridge arm and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36, so as to supply power to the primary winding of the second transformer T2, thereby achieving the purpose of supplying power to the load or the battery.

[0098] In one possible embodiment, the all-in-one control device may further include a switch controller (not shown) for controlling the first switch unit 33 or the second switch unit 37, and the switch controller is used to control the operating state of the first switch unit 33 or the second switch unit 37.

[0099] For example, during the charging process of the power conversion circuit 31 to the power battery 10, the first switching unit 33 is controlled to connect the connection between the midpoint of the second bridge arm and one end of the secondary winding of the first transformer 312, and the first switching unit 33 is controlled to disconnect the connection between the midpoint of the second bridge arm and one end of the rotor winding 41; at the same time, the second switching unit 37 is controlled to disconnect the connection between the other end of the primary winding of the second transformer T2 and the midpoint of the first bridge arm, and the connection between the other end of the primary winding of the second transformer T2 and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36 ​​is controlled to be connected.

[0100] For example, during the process of the multi-in-one power supply device 30 supplying power to the rotor winding 41, the switch controller is used to control the first switch unit 33 to conduct the connection between the midpoint of the second bridge arm of the secondary bridge arm circuit 313 and the rotor winding 41 of the electrically excited motor 40, and to control the first switch unit 33 to disconnect the connection between the midpoint of the second bridge arm and one end of the secondary winding of the first transformer 312; at the same time, it controls the second switch unit 37 to conduct the connection between the other end of the primary winding of the second transformer T2 and the midpoint of the first bridge arm, and to control the second switch unit 37 to disconnect the connection between the other end of the primary winding of the second transformer T2 and the midpoint of the bridge arm of one phase of the three-phase inverter circuit 36.

[0101] In another possible embodiment, the function performed by the switch controller can be implemented by the control circuit board or VCU, and this application embodiment does not specifically limit this.

[0102] In another embodiment of this application, an all-in-one powertrain 20 is also provided. The all-in-one powertrain 20 includes an electrically excited motor 40 and the all-in-one power supply device 30 provided in the above embodiments. The all-in-one power supply device 30 includes a power conversion circuit 31 and a three-phase inverter circuit 36. The power conversion circuit 31 includes a primary-side bridge arm circuit 311, a first transformer 312, and a secondary-side bridge arm circuit 313. The primary-side bridge arm circuit 311 includes two bridge arms, the midpoints of which are respectively used to connect to the two ends of the primary winding of the first transformer 312. The secondary bridge arm circuit 313 includes a first bridge arm, a second bridge arm, and a third bridge arm. The midpoint of the first bridge arm is used to connect one end of the secondary winding of the first transformer 312. The midpoint of the second bridge arm is used to connect the other end of the secondary winding of the first transformer 312 and one end of the rotor winding 41 of the electrically excited motor 40 through the first switching unit 33. The midpoint of the third bridge arm is used to connect the other end of the rotor winding 41. The midpoints of the three bridge arms of the three-phase inverter circuit 36 ​​are respectively used to connect the three-phase windings 42 of the stator of the electrically excited motor 40.

[0103] In another embodiment of this application, an electric vehicle 01 is also provided, which includes a power battery 10 and an all-in-one powertrain 20 provided in the above embodiments. The all-in-one powertrain 20 is used to receive AC power to charge the power battery 10, or the power battery 10 to supply power to the all-in-one powertrain 20.

[0104] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions within the technical scope 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 multi-functional power supply device, characterized in that, The multi-functional power supply device is used to receive AC power output from the AC charging pile and convert the AC power into DC power to charge the power battery, and is also used to receive DC power output from the power battery through a power conversion circuit to supply power to the rotor winding of the electrically excited motor. The multi-functional power supply device includes: At least one circuit board, said at least one circuit board for carrying electrical components of the power conversion circuit, The housing is used to house at least one circuit board, and the housing also includes a power battery interface for connecting a power battery. The multi-in-one power supply device charges the power battery or receives power from the power battery through the power battery interface. The power conversion circuit includes a primary-side bridge arm circuit, a first transformer, and a secondary-side bridge arm circuit; wherein: The primary-side bridge arm circuit includes two bridge arms, and the midpoints of the two bridge arms are respectively used to connect the two ends of the primary winding of the first transformer. The secondary bridge arm circuit includes a first bridge arm, a second bridge arm, and a third bridge arm. The midpoint of the first bridge arm is used to connect one end of the secondary winding of the first transformer. The midpoint of the second bridge arm is used to connect the other end of the secondary winding of the first transformer and one end of the rotor winding through a first switching unit. The midpoint of the third bridge arm is used to connect the other end of the rotor winding.

2. The all-in-one power supply device according to claim 1, characterized in that, The third arm of the secondary side bridge arm circuit includes a first capacitor and a second capacitor connected in series.

3. The all-in-one power supply device according to claim 1 or 2, characterized in that, The first switching unit is used to connect or disconnect the connection between one end of the secondary winding of the first transformer and the midpoint of the second bridge arm, and to connect or disconnect the connection between the midpoint of the second bridge arm and one end of the rotor winding of the electrically excited motor.

4. The all-in-one power supply device according to claim 3, characterized in that, The all-in-one power supply device also includes a power factor correction circuit; During the charging process of the power conversion circuit to the power battery, the first switching unit connects the connection between the midpoint of the second bridge arm and one end of the secondary winding of the first transformer and disconnects the connection between the midpoint of the second bridge arm and one end of the rotor winding. The power factor correction circuit is used to convert the AC power output by the AC charging pile into DC power. The power conversion circuit is used to perform voltage conversion on the DC power output by the power factor correction circuit and charge the power battery through the power battery interface.

5. The all-in-one power supply device according to claim 3, characterized in that, During the process of the multi-in-one power supply device receiving DC power output from the power battery through the power conversion circuit to supply power to the rotor winding, the first switching unit connects the connection between the midpoint of the second bridge arm of the secondary bridge arm circuit and the rotor winding of the electrically excited motor and disconnects the connection between the midpoint of the second bridge arm and one end of the secondary winding of the first transformer. The midpoints of the second and third bridge arms supply power to the rotor winding.

6. The all-in-one power supply device according to any one of claims 1-5, characterized in that, The all-in-one power supply device also includes a DC-DC converter circuit, which is used to step down the DC power output from the power battery, or, the DC-DC converter circuit is used to step down the DC power output from the power conversion circuit during the charging process of the all-in-one power supply device for the power battery.

7. The all-in-one power supply device according to claim 6, characterized in that, The DC-DC converter circuit includes a second transformer and a secondary circuit; wherein: The two ends of the primary winding of the second transformer are respectively used to connect the midpoint of the first bridge arm and the midpoint of the third bridge arm of the secondary bridge arm circuit. The secondary winding of the second transformer is used to supply power to the secondary circuit.

8. The all-in-one power supply device according to claim 6, characterized in that, The all-in-one power supply device also includes a three-phase inverter circuit, wherein the midpoints of the three bridge arms of the three-phase inverter circuit are respectively used to connect the three-phase windings of the stator of the electrically excited motor.

9. The all-in-one power supply device according to claim 8, characterized in that, The DC-DC converter circuit includes a second transformer and a secondary circuit; wherein: The two ends of the primary winding of the second transformer are respectively used to connect the midpoint of the third bridge arm of the secondary bridge arm circuit and the midpoint of the bridge arm of one phase of the three-phase inverter circuit.

10. The all-in-one power supply device according to claim 8, characterized in that, The DC-DC converter circuit includes a second transformer and a secondary circuit; wherein: One end of the primary winding of the second transformer is used to connect to the midpoint of the bridge arm of the third bridge arm; The other end of the primary winding of the second transformer is used to connect the midpoint of the first bridge arm and the midpoint of one phase bridge arm of the three-phase inverter circuit through the second switching unit. The secondary winding of the second transformer is used to supply power to the secondary circuit.

11. The all-in-one power supply device according to claim 10, characterized in that, During the process of the DC-DC converter circuit performing step-down conversion on the DC power output from the power battery, the second switching unit connects the connection between the other end of the primary winding of the second transformer and the midpoint of the first bridge arm, and disconnects the connection between the other end of the primary winding of the second transformer and the midpoint of the bridge arm of one phase of the three-phase inverter circuit. The third bridge arm and one phase of the three-phase inverter circuit are used to supply power to the primary winding of the second transformer.

12. The all-in-one power supply device according to claim 10, characterized in that, During the process of the DC-DC converter circuit performing step-down conversion on the DC output of the power converter circuit, the second switching unit disconnects the connection between the other end of the primary winding of the second transformer and the midpoint of the first bridge arm, and connects the other end of the primary winding of the second transformer and the midpoint of the bridge arm of one phase of the three-phase inverter circuit. The third bridge arm and the first bridge arm are used to supply power to the primary winding of the second transformer.

13. The all-in-one power supply device according to any one of claims 8-12, characterized in that, The all-in-one power supply device also includes a control circuit board located within the housing, the control circuit board being used to control each switch in the three-phase inverter circuit and each switch in the secondary bridge arm circuit.

14. An all-in-one powertrain, characterized in that, The all-in-one powertrain includes an electrically excited magneto motor and an all-in-one power supply device as described in any one of claims 1-13, wherein the all-in-one power supply device includes a power conversion circuit and a three-phase inverter circuit; The power conversion circuit includes a primary-side bridge arm circuit, a first transformer, and a secondary-side bridge arm circuit, wherein: The primary-side bridge arm circuit includes two bridge arms, and the midpoints of the two bridge arms are respectively used to connect the two ends of the primary winding of the first transformer. The secondary bridge arm circuit includes a first bridge arm, a second bridge arm, and a third bridge arm. The midpoint of the first bridge arm is used to connect one end of the secondary winding of the first transformer. The midpoint of the second bridge arm is used to connect the other end of the secondary winding of the first transformer and one end of the rotor winding of the electrically excited motor through a first switching unit. The midpoint of the third bridge arm is used to connect the other end of the rotor winding. The midpoints of the three bridge arms of the three-phase inverter circuit are respectively used to connect the three-phase windings of the stator of the electrically excited motor.

15. An electric vehicle, characterized in that, The electric vehicle includes a power battery and the all-in-one powertrain as described in claim 14, wherein the all-in-one powertrain is used to receive AC power to charge the power battery, or the power battery supplies power to the all-in-one powertrain.

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