Energy conversion device, power system and vehicle

Abstract

The energy conversion device (1), power system (5), and vehicle include an inductor (12) having one end connected to an external charging port (2), a bridge converter (13) connected between an external battery (3) and the external charging port (2) and including a first phase bridge (131), a second phase bridge (132), and a third phase bridge (133) connected in parallel, the other end of the inductor (12) being connected to the first phase bridge (131), a transformer unit (14) having input ends connected to the second phase bridge (132) and the third phase bridge (133), respectively, and a first bidirectional H-bridge (15) connected between an output end of the transformer unit (14) and the external battery (3).

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from Chinese Patent Application No. "201910582158.7" filed by BD Company Limited on June 30, 2019, entitled "Energy Conversion Device, Power System and Vehicle."

[0002] This application is in the field of electronics, and more particularly, energy conversion devices, power systems and vehicles. [Background technology]

[0003] In recent years, investment in electric vehicles has been steadily increasing. Electric vehicle-related technologies have been developing rapidly, and market acceptance of electric vehicles has been steadily increasing. Battery charging and motor drive, as core technologies in electric vehicles, have attracted widespread attention. Currently, the battery charging circuit and motor drive circuit in conventional electric vehicles on the market are generally configured separately. The battery charging circuit charges the electric vehicle's battery, and the motor drive circuit drives the electric vehicle's motor. The two circuits do not interfere with each other and are independent of each other.

[0004] However, although two types of circuits can be employed to complete the battery charging and motor driving processes of an electric vehicle, the two types of circuits in the above method do not interfere with each other and are independent of each other, which results in a complex structure of the control circuit including the battery charging circuit and the motor driving circuit, low integration, large volume, and high cost.

[0005] As described above, the conventional technology has problems such as a complex overall structure of the control circuit including the battery charging circuit and the motor driving circuit, low integration, large volume, and high cost. Summary of the Invention [Problem to be solved by the invention]

[0006] This application aims to at least somewhat solve one of the technical problems in the related art.

[0007] This application aims to solve the problems that in a conventional control circuit including a battery charging circuit and a motor driving circuit, the overall structure is complex, the integration degree is low, the volume is large, and the cost is high, by providing an energy conversion device, a power system, and a vehicle.

Means for Solving the Problem

[0008] This application is realized as follows. The energy conversion device includes an inductor with one end connected to an external charging port, a bridge converter including a first-phase bridge, a second-phase bridge, and a third-phase bridge connected in parallel between an external battery and the external charging port, and the other end of the inductor is connected to the first-phase bridge, a transformer unit with input ends respectively connected to the second-phase bridge and the third-phase bridge, and a first bidirectional H-bridge connected between the output end of the transformer unit and the external battery. The external battery is connected to an external motor via the bridge converter, and the external charging port is connected to the external battery via the inductor, the bridge converter, the transformer unit, and the first bidirectional H-bridge. The external battery drives the external motor by the energy conversion device, and the external charging port is externally connected to a power source and charges the external battery by the energy conversion device.

[0009] Another object of this application is to provide a power system including the above energy conversion device and a control module. The above energy conversion device includes an in-vehicle charging module including an inductor connected to an external charging port, a motor control module including a bridge converter respectively connected to the external charging port, the inductor, the external motor, and the external battery. a bidirectional DC / DC module including a transformer unit and a first bidirectional H-bridge, wherein one end of the transformer unit is connected to a bridge converter, the other end of the transformer unit is connected to one end of the first bidirectional H-bridge, and the other end of the first bidirectional H-bridge is connected to an external battery; The external battery is connected to the motor through a bridge converter, and the external charging port is connected to the external battery through an inductor, a bridge converter, a transformer unit, and a first bidirectional H-bridge; The control module controls the energy conversion device to drive the motor, and when the external charging port is externally connected to a power source, the control module further controls the energy conversion device to charge the external battery.

[0010] Another object of the present invention is to provide an energy conversion device, the energy conversion device comprising: a charging connection terminal group including a first charging connection terminal and a second charging connection terminal; a bridge converter including a first phase bridge, a second phase bridge, and a third phase bridge, the first phase bridge, the second phase bridge, and the third phase bridge being connected in parallel to form a first bus end and a second bus end, and the second bus end being connected to a second charging connection end; an inductor having one end connected to the first charging connection end and the other end connected to the midpoint of the first phase bridge; a drive output connection terminal group including a first drive output connection terminal, a second drive output connection terminal, and a third drive output connection terminal, wherein the first drive output connection terminal is connected to a midpoint of a first phase bridge, the second drive output connection terminal is connected to a midpoint of a second phase bridge, and the third drive output connection terminal is connected to a midpoint of a third phase bridge; a transformer unit whose input terminals are respectively connected to the midpoint of the second phase bridge and the midpoint of the third phase bridge; a first bidirectional H-bridge having an input connected to an output of the transformer unit; an energy storage connection terminal group including a first energy storage connection terminal and a second energy storage connection terminal, wherein the first energy storage connection terminal is connected to a first bus terminal, the second energy storage connection terminal is connected to a second bus terminal, and the output terminals of the first bidirectional H-bridge are respectively connected to the first energy storage connection terminal and the second energy storage connection terminal.

[0011] Another object of the present invention is to provide a power system including the above energy conversion device and a control module, wherein the energy conversion device comprises: an in-vehicle charging module including an inductor and a charging connection terminal group including a first charging connection terminal and a second charging connection terminal, wherein one end of the inductor is connected to the first charging connection terminal; a motor control module including a bridge converter including a first phase bridge, a second phase bridge, and a third phase bridge, and a group of drive output connection terminals, wherein the midpoint of the first phase bridge is connected to the other end of the inductor, the first phase bridge, the second phase bridge, and the third phase bridge are connected in parallel to form a first bus end and a second bus end, the second bus end is connected to a second charging connection terminal, the group of drive output connection terminals includes a first drive output connection terminal, a second drive output connection terminal, and a third drive output connection terminal, wherein the first drive output connection terminal is connected to the midpoint of the first phase bridge, the second drive output connection terminal is connected to the midpoint of the second phase bridge, and the third drive output connection terminal is connected to the midpoint of the third phase bridge; A bidirectional DC / DC module including a transformer unit, a first bidirectional H-bridge, and an energy storage connection terminal group, wherein the input terminals of the transformer unit are respectively connected to the midpoints of a second phase bridge and a third phase bridge, the output terminal of the transformer unit is connected to the input terminal of the first bidirectional H-bridge, the energy storage connection terminal group includes a first energy storage connection terminal and a second energy storage connection terminal, the first energy storage connection terminal is connected to a first bus terminal, the second energy storage connection terminal is connected to a second bus terminal, and the output terminals of the first bidirectional H-bridge are respectively connected to the first energy storage connection terminal and the second energy storage connection terminal.

[0012] Another object of the present application is to provide a vehicle including the above power system.

[0013] The present application provides an energy conversion device, a power system, and a vehicle. By adopting an inductor, a bridge converter, a transformer unit, and a first bidirectional H-bridge in the energy conversion device, the energy conversion device can operate in a driving mode and a charging mode in a time-division manner. When driving the motor, the battery, the bridge converter, and the motor constitute a driving circuit for driving the motor. When charging, the charging port, the inductor, the bridge converter, the transformer unit, the first bidirectional H-bridge, and the battery constitute a charging circuit. Therefore, in the driving circuit and the charging circuit, multiplexing the bridge converter not only simplifies the circuit structure but also improves the integration degree, thereby reducing the volume and cost, and solving the problem that the overall structure of the control circuit including the conventional battery charging circuit and the motor driving circuit is complex, the integration degree is low, the volume is large, and the cost is high.

[0014] The bridge converter in this application may be divided into two parts. The first phase bridge cooperates with an inductor and is used as a boost DC. The remaining two-phase bridge constitutes one bidirectional H-bridge for converting DC to AC. By utilizing all the bridges in the bridge converter in this application, the utilization rate of the switching tubes and the integration degree of the circuit are improved.

[0015] A transformer unit and a first bidirectional H-bridge are provided between the bridge converter and the battery in this application, thereby achieving the purpose of separate charging. Thereby, while improving the charging safety performance of the electric vehicle, the bidirectional DC in this application utilizes the remaining two-phase bridge of the bridge converter as a pre-bidirectional H-bridge, reducing the demand for switching tubes, further reducing costs, and also improving the integration degree of the circuit.

[0016] Some of the additional aspects and advantages of this application are shown in the following description, some will become clear in the following description, or will be understood through the practice of this application.

Brief Description of the Drawings

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Mode for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present application will be described in detail. Examples of the above embodiments are shown in the drawings, and throughout the drawings, the same or similar reference numerals indicate the same or similar components, or components having the same or similar functions. The embodiments described below with reference to the drawings are merely exemplary and should not be construed as interpreting or limiting the present application.

[0019] Hereinafter, the implementation of the present application will be described in detail with reference to specific drawings.

[0020] FIGS. 1 to 3 show the module structure of the energy conversion device 1 according to Embodiment 1 of the present application. For ease of explanation, only the parts related to this embodiment are shown and will be described in detail as follows.

[0021] As shown in FIG. 1, the energy conversion device 1 according to the embodiment of the present application includes an inductor 12, a bridge converter 13, a transformer unit 14, and a first bidirectional H-bridge 15.

[0022] Specifically, as shown in FIG. 1, the bridge converter 13 includes a first phase bridge 131, a second phase bridge 132, and a third phase bridge 133 connected in sequence. One end of the external charging port 2 is connected to one end of the inductor 12, the other end is connected to the bridge converter 13, and the other end of the inductor 12 is connected to the first phase bridge 131. The first phase bridge 131, the second phase bridge 132, and the third phase bridge 133 are connected in parallel, and the second phase bridge 132 and the third phase bridge 133 are respectively connected to the input end of the transformer unit 14. The output end of the transformer unit 14 is connected to the input end of the first bidirectional H-bridge 15, and the output end of the first bidirectional H-bridge 15 is connected to the external battery 3. The bridge converter 13 is further connected between the external battery 3 and the external motor 4.

[0023] The energy conversion device 1 operates in a driving mode and a charging mode in a time-division manner.

[0024] When the energy conversion device 1 operates in driving mode, as shown in FIG. 2 , in driving mode, the external battery 3, the bridge converter 13, and the external motor 4 form a driving circuit for driving the external motor 4, the external battery 3 supplies DC current to the bridge converter 13, the first phase bridge 131 in the bridge converter 13 converts the DC current into three-phase AC current, and inputs the three-phase AC current to the external motor 4 to drive it, and the external motor 4 outputs AC current, which is converted into DC current via the second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 and output, and flows back to the external battery 3.

[0025] When the energy conversion device 1 operates in a charging mode, as shown in Fig. 3, the external charging port 2, inductor 12, bridge converter 13, transformer unit 14, and first bidirectional H-bridge 15 form a charging circuit for charging the external battery 3. Regarding the external charging port 2, the power source supplied to the charging circuit by the external charging port 2 in the charging mode may be a DC power source.

[0026] When the external charging port 2 supplies DC power, as shown in FIG. 3 , the external charging port 2, inductor 12, bridge converter 13, transformer unit 14, first bidirectional H-bridge 15, and external battery 3 form a DC charging circuit. At this time, inductor 12 and the first phase bridge 131 in the bridge converter 13 boost the DC current output from the external charging port 2 and output the DC current. The second phase bridge 132 and third phase bridge 133 in the bridge converter 13 convert the DC current output from the first phase bridge 131 to an AC current and output it. The transformer unit 14 converts the high-frequency AC current and outputs another high-frequency AC current. The first bidirectional H-bridge 15 rectifies the high-frequency AC current output from the transformer unit 14 and outputs a DC current to charge the external battery 3.

[0027] Alternatively, the external charging port 2, the inductor 12, the first-phase bridge 131 of the bridge converter 13, and the external battery 3 form a DC charging circuit. At this time, the inductor 12 and the first-phase bridge 131 in the bridge converter 13 boost the DC current output from the external charging port 2 and output a DC current to charge the external battery 3.

[0028] Regarding the inductor 12, in the above charging mode, the inductor 12 is used for storing and releasing electrical energy.

[0029] Regarding the bridge converter 13, the bridge converter 13 includes at least three-phase bridges connected in parallel. Each phase bridge is connected to both the external battery 3 and the external motor 4 and includes two power switches connected in series. In the above driving mode, the bridge converter 13 converts the electrical energy input from the external battery 3 and outputs a three-phase alternating current to drive the external motor 4. In the above charging mode, the bridge converter 13 converts the electrical energy in the charging circuit and outputs a DC current or a high-frequency alternating current, and at the same time increases the charging power to charge the external battery 3.

[0030] As shown in FIG. 4, the bridge converter 13 in this embodiment may further be another multi-phase bridge converter, for example, a six-phase bridge converter. At this time, the bridge converter 13 has a six-phase bridge, which is the first-phase bridge 131, the second-phase bridge 132, the third-phase bridge 133, the fourth-phase bridge 134, the fifth-phase bridge 135, and the sixth-phase bridge 136 connected in parallel with each other. Each phase bridge is connected to both the external battery 3 and the external motor 4 and includes two power switches connected in series. Also, as shown in FIG. 4, the bridge connected to the transformer unit is not limited to the second-phase bridge 132 and the third-phase bridge 133, and may be another bridge that can convert the DC current output from the first-phase bridge 131 into an alternating current, for example, the third-phase bridge 133 and the fourth-phase bridge 134, and specific limitations are not made here.

[0031] Regarding the transformer unit 14, in the above charging mode, the transformer unit 14 converts the alternating current input to the charging circuit into another alternating current and outputs it, realizing the separation of the circuits on both sides of the transformer unit 14.

[0032] Regarding the first bidirectional H-bridge 15, the first bidirectional H-bridge 15 includes at least two bridges connected in parallel, and each bridge includes two power switches connected in series. In the above charging mode, the first bidirectional H-bridge 15 charges the external battery 3 by rectifying the alternating current in the charging circuit and outputting a direct current.

[0033] When specifically implemented, the DC power supply supplies a DC current to the energy conversion device 1 through the external charging port 2, and the DC power supply may be a DC current after rectifying an external AC power supply or a DC current output by an external charging stand, and no specific limitation is made here.

[0034] It should be noted that when specifically operating, the energy conversion device 1 can operate not only in the above driving mode and charging mode, but various operation modes of the energy conversion device 1 will be described in detail later, and the description is omitted here.

[0035] In this embodiment, by adopting the energy conversion device 1 including the inductor 12, the bridge converter 13, the transformer unit 14, and the first bidirectional H-bridge 15, the energy conversion device 1 operates in a driving mode and a charging mode in a time-division manner. When driving the external motor 4, the external battery 3, the bridge converter 13, and the external motor 4 constitute a driving circuit for driving the external motor 4. When performing charging, the external charging port 2, the inductor 12, the first phase bridge 131, and the external battery 3 constitute a charging circuit. Or, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute a charging circuit. Therefore, in the driving circuit and the charging circuit, by multiplexing the bridge converter 13, not only the circuit structure is simplified, but also the integration degree is improved, thereby reducing the volume and achieving the purpose of reducing the cost, and solving the problem that the overall structure of the conventional control circuit including the battery charging circuit and the motor driving circuit is complex, the integration degree is low, the volume is large, and the cost is high.

[0036] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 5, the external motor 4 includes a motor coil 41. The first phase bridge 131 includes a first power switch Q1 and a second power switch Q2 connected in series. The second phase bridge 132 includes a third power switch Q3 and a fourth power switch Q4 connected in series. The third phase bridge 133 includes a fifth power switch Q5 and a sixth power switch Q6 connected in series.

[0037] Specifically, a first intermediate point between the first power switch Q1 and the second power switch Q2 is connected to the inductor 12, a second intermediate point between the third power switch Q3 and the fourth power switch Q4 is connected to the transformer unit 14, a third intermediate point between the fifth power switch Q5 and the sixth power switch Q6 is connected to the transformer unit 14, the first ends of the first power switch Q1, the third power switch Q3, and the fifth power switch Q5 are commonly connected to form a first bus end of the bridge converter 13, the second ends of the second power switch Q2, the fourth power switch Q4, and the sixth power switch Q6 are commonly connected to form a second bus end of the bridge converter 13, the second bus end is connected to the external charging port 2, the first bus end is connected to one end of the external battery 3, the second bus end is connected to the other end of the external battery 3, the first intermediate point is connected to the first phase coil of the motor coil 41, the second intermediate point is connected to the second phase coil of the motor coil 41, and the third intermediate point is connected to the third phase coil of the motor coil 41.

[0038] The first intermediate point between the first power switch Q1 and the second power switch Q2 refers to a point located on the connection line between the first power switch Q1 and the second power switch Q2, and the inductor 12 is connected to the first power switch Q1 and the second power switch Q2 simultaneously through this point. Similarly, the positions of the second intermediate point and the third intermediate point can be known, and the description is omitted here.

[0039] In this embodiment, the plurality of power switches in the bridge converter 13 can be realized by adopting a device in which diodes are connected in parallel and which can perform a switching operation, such as a power transistor, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), or other switching devices.

[0040] In other embodiments of the present application, when the bridge converter 13 operates, the power switches in the first phase bridge 131, the power switches in the second phase bridge 132, and the power switches in the third phase bridge 133 receive control signals with a predetermined phase shift. In this embodiment, the predetermined phase is preferably an angle of 120 degrees, and the preferred angle does not limit the predetermined phase.

[0041] In other embodiments of the present application, as one embodiment of the present application, when the inductor 12 in the energy conversion device 1 receives a direct current, by switching the on / off states of the first power switch Q1 and the second power switch Q2, the inductor 12 can store and release electrical energy and achieve power factor correction (hereinafter abbreviated as PFC).

[0042] In this embodiment, by controlling the three-phase bridges of the bridge converter 13 by means of a three-phase interleaved control operation method, when the energy conversion device 1 is charging, the DC side ripple decreases and the charging power increases. Also, in the charging mode, the first phase bridge 131 can cooperate with the inductor 12 to achieve PFC, boost the voltage by the first power switch Q1, and output a DC voltage. By controlling the cooperative action of the power switches in the second phase bridge 132 and the third phase bridge 133, the second phase bridge 132 and the third phase bridge 133 can convert the DC current into a high-frequency alternating current. In the driving mode, by controlling the three-phase bridges in the bridge converter 13, the electrical energy input from the external battery 3 is converted, the voltage and current of the motor coil 41 are adjusted, and the driving of the external motor 4 is realized.

[0043] In other embodiments of the present application, as one embodiment of the present application, as shown in FIG. 5, the energy conversion device 1 further includes a first capacitor C1, and the first capacitor C1 is connected between the first bus terminal and the second bus terminal.

[0044] When specifically operating, when the energy conversion device 1 is in the charging mode, the first capacitor C1 performs filtering processing on the voltage output from the bridge converter 13 and stores energy based on the voltage output from the bridge converter 13, thereby completing the DC charging process of the external battery 3. At the same time, when the energy conversion device 1 is in the driving mode, the first capacitor C1 performs filtering processing on the voltage input to the bridge converter 13.

[0045] In this embodiment, by providing the first capacitor C1 in the energy conversion device 1, the first capacitor C1 performs filtering processing on the voltage output from the bridge converter 13 and at the same time stores energy based on the voltage output from the bridge converter 13 to complete the charging of the external battery 3. Thereby, the normal charging function of the energy conversion device 1 is guaranteed, and it can be guaranteed that other clutters do not interfere with the charging process. At the same time, when the energy conversion device 1 is in the driving mode, filtering processing can be performed on the voltage input to the bridge converter 13.

[0046] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 6, the transformer unit 14 in the energy conversion device 1 further includes a primary coil T0 and a first secondary coil T1.

[0047] As shown in FIG. 6, one end of the primary coil T0 is connected to the second intermediate point, the other end of the primary coil T0 is connected to the third intermediate point, and the first secondary coil T1 is connected to the first bidirectional H-bridge 15, whereby the external charging port 2, the inductor 12, the bridge converter 13, the primary coil T0, the first secondary coil T1, the first bidirectional H-bridge 15, and the external battery 3 constitute a DC charging circuit.

[0048] Specifically, as one embodiment of the present application, as shown in FIG. 7, the energy conversion device 1 further includes a first inductor L1 and a second capacitor C2.

[0049] As shown in FIG. 7, a first inductor L1 is provided between one side of the primary coil T0 and a second intermediate point, and a second capacitor C2 is provided between the other side of the primary coil T0 and a third intermediate point.

[0050] In the present embodiment, the external charging port 2, the inductor 12, the first phase bridge 131, the second phase bridge 132, the third phase bridge 133, the first inductor L1, the second capacitor C2, the primary coil T0, the first secondary coil T1, the first bidirectional H-bridge 15, and the external battery 3 constitute a DC charging circuit. The first inductor L1 and the second capacitor C2 resonate in the DC charging circuit and cooperate with the power switches in the second phase bridge 132 and the third phase bridge 133 to achieve soft switching.

[0051] As one embodiment of the present application, as shown in FIG. 7, the energy conversion device 1 further includes a second inductor L2 and a third capacitor C3.

[0052] The second inductor L2 is provided between one side of the first secondary coil T1 and a fourth intermediate point, and the third capacitor C3 is provided between the other side of the first secondary coil T1 and a fifth intermediate point.

[0053] In the present embodiment, the external charging port 2, the inductor 12, the first phase bridge 131, the second phase bridge 132, the third phase bridge 133, the primary coil T0, the first secondary coil T1, the second inductor L2, the third capacitor C3, the seventh power switch Q7, the eighth power switch Q8, the ninth power switch Q9, the tenth power switch Q10, and the external battery 3 constitute a DC charging circuit. The second inductor L2 and the third capacitor C3 resonate in the DC charging circuit and cooperate with the power switches in the seventh phase bridge 151 and the eighth phase bridge 152 to achieve soft switching.

[0054] As one embodiment of the present application, as shown in FIG. 8, the first bidirectional H-bridge 15 in the energy conversion device 1 includes a seventh phase bridge 151 and an eighth phase bridge 152.

[0055] The seventh phase bridge 151 includes a seventh power switch Q7 and an eighth power switch Q8 connected in series, and the eighth phase bridge 152 includes a ninth power switch Q9 and a tenth power switch Q10 connected in series.

[0056] A fourth intermediate point between the seventh power switch Q7 and the eighth power switch Q8 is connected to one end of the first secondary coil T1, a fifth intermediate point between the ninth power switch Q9 and the tenth power switch Q10 is connected to the other end of the first secondary coil T1, the first ends of the seventh power switch Q7 and the ninth power switch Q9 are commonly connected to form the third bus end of the first bidirectional H-bridge 15, the second ends of the eighth power switch Q8 and the tenth power switch Q10 are commonly connected to form the fourth bus end of the first bidirectional H-bridge 15, the third bus end is connected to one end of the external battery 3, and the fourth bus end is connected to the other end of the external battery 3.

[0057] In this embodiment, the external charging port 2, the inductor 12, the first phase bridge 131, the second phase bridge 132, the third phase bridge 133, the primary coil T0, the first secondary coil T1, the seventh power switch Q7, the eighth power switch Q8, the ninth power switch Q9, the tenth power switch Q10 and the external battery 3 form a DC charging circuit, and the seventh power switch Q7, the eighth power switch Q8, the ninth power switch Q9 and the tenth power switch Q10 form a full-bridge rectifier circuit. By rectifying the high-frequency alternating current output from the first secondary coil T1 into a direct current by the full-bridge rectifier circuit and outputting a direct current voltage having high-frequency energy, the external battery 3 is charged.

[0058] In the embodiments of the present application, the plurality of power switches in the first bidirectional H-bridge 15 can be realized by adopting a device in which diodes are connected in parallel and which can perform a switching operation, such as a power transistor, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), or other switching devices.

[0059] As one embodiment of the present application, as shown in FIG. 9, the energy conversion device 1 further includes a fourth capacitor C4.

[0060] In this embodiment, the external charging port 2, the inductor 12, the first phase bridge 131, the second phase bridge 132, the third phase bridge 133, the primary coil T0, the first secondary coil T1, the seventh power switch Q7, the eighth power switch Q8, the ninth power switch Q9, the tenth power switch Q10, the fourth capacitor C4, and the external battery 3 constitute a DC charging circuit, and the fourth capacitor C4 performs a filtering process on the voltage output from the first bidirectional H-bridge 15 to charge the external battery 3.

[0061] In this embodiment, by adopting a transformer unit 14 including the primary coil T0 and the first secondary coil T1, in the configured DC charging circuit, the input high-frequency alternating current is converted into another high-frequency alternating current and output, and the separation of the circuits on both sides of the transformer unit 14 is realized, and the electrostatic interference generated between the circuits on both sides can be avoided. At the same time, in the DC charging circuit, the second phase bridge 132 and the third phase bridge 133 are multiplexed, and the DC current is converted into an alternating current, so as to simplify the circuit structure, reduce the volume, and achieve the purpose of reducing the cost.

[0062] In another embodiment of the present application, as shown in FIG. 10, the transformer unit 14 in the energy conversion device 1 further includes a second secondary coil T2.

[0063] Specifically, when the second secondary coil T2 is connected to the storage battery or the on-board discharge port by the second bidirectional H-bridge 16 and the storage battery is being charged, the external charging port 2, inductor 12, bridge converter 13, transformer unit 14, and second bidirectional H-bridge 16 form a charging circuit for the storage battery; when the external charging port 2 is connected to a charging device and the on-board discharge port is connected to an electrical appliance, the external charging port 2, inductor 12, bridge converter 13, transformer unit 14, and second bidirectional H-bridge 16 form a charging circuit for the electrical appliance; and when the external charging port 2 is not connected to a charging device and the on-board discharge port is connected to an electrical appliance, the external battery 3, first bidirectional H-bridge 15, transformer unit 14, and second bidirectional H-bridge 16 form a discharge circuit for the electrical appliance.

[0064] In this embodiment, by adopting a transformer unit 14 including a primary coil T0, a first secondary coil T1, and a second secondary coil T2, when the energy conversion device 1 is operating, the external charging port 2, the inductor 12, the bridge converter 13, the primary coil T0, the second secondary coil T2, the second bidirectional H-bridge 16, and the storage battery or the vehicle-mounted discharge port can form a storage battery charging circuit or an on-board discharge port circuit. Furthermore, when the DC charging circuit and the storage battery charging circuit or the on-board discharge port circuit are operating, they do not interfere with each other, improving the reliability of the circuit and allowing the external battery 3 to discharge to the electrical equipment connected to the vehicle-mounted discharge port, thereby improving the functionality of the entire control circuit.

[0065] In another embodiment of the present application, as shown in FIG. 11, the second bidirectional H-bridge 16 in the energy conversion device 1 includes a ninth phase bridge 161 and a tenth phase bridge 162.

[0066] Specifically, the ninth phase bridge 161 includes a thirteenth power switch Q13 and a fourteenth power switch Q14 connected in series, and the tenth phase bridge 162 includes a fifteenth power switch Q15 and a sixteenth power switch Q16 connected in series.

[0067] A seventh intermediate point between the thirteenth power switch Q13 and the fourteenth power switch Q14 is connected to one end of the second secondary coil T2, an eighth intermediate point between the fifteenth power switch Q15 and the sixteenth power switch Q16 is connected to the other end of the second secondary coil T2, and a first end of the thirteenth power switch Q13 and No. 15 Power switch Q15 The first ends of the fourteenth power switch Q14 and the sixteenth power switch Q16 are connected together to form a fifth bus end of the second bidirectional H-bridge 16, the second end of the fourteenth power switch Q14 and the second end of the sixteenth power switch Q16 are connected together to form a sixth bus end of the second bidirectional H-bridge 16, the fifth bus end is connected to one end of the storage battery or the vehicle discharge port, and the sixth bus end is connected to the other end of the storage battery or the vehicle discharge port.

[0068] In this embodiment, the external charging port 2, the inductor 12, the bridge converter 13, the primary coil T0, the second secondary coil T2, the second bidirectional H-bridge 16, and the storage battery or the on-board discharge port constitute a storage battery charging circuit or an on-board discharge port circuit. By adopting the second bidirectional H-bridge 16 composed of the ninth phase bridge 161 and the tenth phase bridge 162, the AC current output from the second secondary coil T2 can be converted into DC current to charge the storage battery or the on-board discharge port.

[0069] In the embodiments of the present application, the plurality of power switches in the second bidirectional H-bridge 16 can be realized by adopting a device in which a diode is connected in parallel and can perform a switching operation, such as a power transistor, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), or other switching devices.

[0070] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 12, the external charging port 2 is an AC charging port 21, and the energy conversion device 1 further includes a first rectification module 17a.

[0071] Specifically, the first rectification module 17a is connected to the AC charging port 21, the inductor 12, and the bridge converter 13 respectively. As shown in FIG. 13, the first rectification module 17a may include a rectification bridge. The first input terminal and the second input terminal of the rectification bridge are respectively connected to the AC charging port 21. One output terminal of the rectification bridge is connected to the inductor 12, and the other output terminal of the rectification bridge is connected to the bridge converter 13.

[0072] In this embodiment, the AC charging port 21, the first rectification module 17a, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute an AC charging circuit. Alternatively, the AC charging port 21, the first rectification module 17a, the inductor 12, the first phase bridge 131, and the external battery 3 constitute an AC charging circuit. In the above AC charging circuit, the first rectification module 17a rectifies the AC current input from the AC charging port 21 into a DC current to charge the external battery 3.

[0073] In this embodiment, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, the first rectification module 17a, and the AC charging port 21 constitute an AC discharge circuit. Alternatively, the external battery 3, the first phase bridge 131, the inductor 12, the first rectification module 17a, and the AC charging port 21 constitute an AC discharge circuit. In the above AC discharge circuit, by switching the power switch in the first rectification module 17a, a direct current is converted into an alternating current for discharging from the AC charging port 21.

[0074] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 14, the external charging port 2 includes an AC charging port 21 and a DC charging port 22, and the energy conversion device 1 further includes a second rectification module 17b.

[0075] Specifically, the second rectification modules 17b are respectively connected to the AC charging port 21, the inductor 12, and the bridge converter 13.

[0076] In this embodiment, the AC charging port 21, the second rectification module 17b, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute an AC charging circuit. Alternatively, the AC charging port 21, the second rectification module 17b, the inductor 12, the first phase bridge 131, and the external battery 3 constitute an AC charging circuit. In the above AC charging circuit, the second rectification module 17b rectifies the alternating current input from the AC charging port 21 into a direct current to charge the external battery 3.

[0077] In this embodiment, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, the second rectification module 17b, and the AC charging port 21 constitute an AC discharge circuit. Alternatively, the external battery 3, the first phase bridge 131, the inductor 12, the second rectification module 17b, and the AC charging port 21 constitute an AC discharge circuit. In the above AC discharge circuit, by switching the power switch in the second rectification module 17b, a direct current is converted into an alternating current and discharged from the AC charging port 21.

[0078] In this embodiment, the DC charging port 22, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute a DC charging circuit. Alternatively, the DC charging port 22, the inductor 12, the first phase bridge 131, and the external battery 3 constitute a DC charging circuit.

[0079] In this embodiment, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit. Alternatively, the external battery 3, the first phase bridge 131, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit.

[0080] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 15, the external charging port 2 is an AC charging port 21 and a DC charging port 22, and the energy conversion device 1 further includes a bidirectional bridge 18.

[0081] Specifically, the bidirectional bridge 18 is connected to the AC charging port 21 and the bridge converter 13 respectively.

[0082] In this embodiment, the AC charging port 21, inductor 12, bridge converter 13, bidirectional bridge 18, transformer unit 14, first bidirectional H-bridge 15 and external battery 3 constitute an AC charging circuit. In the energy conversion device 1, the bidirectional bridge 18 and the first phase bridge 131 cooperate to form a bidirectional H-bridge to convert AC to DC, and then the second phase bridge 132 and the third phase bridge 133 are used to convert the DC to AC, so that the transformer unit 14 receives the high-frequency AC, which is then rectified into DC by the first bidirectional H-bridge to charge the external battery 3.

[0083] In this embodiment, the external battery 3, the first bidirectional H-bridge, the transformer unit 14, the bidirectional bridge 18, the bridge converter 13, the inductor 12, and the AC charging port 21 constitute an AC discharge circuit. In this AC discharge circuit, the bidirectional bridge 18 and the first phase bridge 131 cooperate to form a bidirectional H-bridge, which converts DC current to AC current and discharges it from the AC charging port 21.

[0084] In addition, in this embodiment, the DC charging port 22, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 form a DC charging circuit, or the DC charging port 22, the inductor 12, the first phase bridge 131, and the external battery 3 form a DC charging circuit.

[0085] In this embodiment, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12 and the DC charging port 22 form a DC discharge circuit, or the external battery 3, the first phase bridge 131, the inductor 12 and the DC charging port 22 form a DC discharge circuit.

[0086] In another embodiment of the present application, as shown in FIG. 16, in one embodiment of the present application, the bidirectional bridge 18 in the energy conversion device 1 includes an eleventh power switch Q11 and a twelfth power switch Q12 connected in series.

[0087] Specifically, the sixth intermediate point between the eleventh power switch Q11 and the twelfth power switch Q12 is connected to the AC charging port 21, the first end of the eleventh power switch Q11 is connected to the first bus end of the bridge converter 13, and the second end of the twelfth power switch Q12 is connected to the second bus end of the bridge converter 13.

[0088] In this embodiment, the AC charging port 21, the inductor 12, the bridge converter 13, the eleventh power switch Q11, the twelfth power switch Q12, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute an AC charging circuit. In the energy conversion device 1, the eleventh power switch Q11 and the twelfth power switch Q12 cooperate with the first power switch Q1 and the second power switch Q2 in the first phase bridge 131 to form a bidirectional H-bridge, thereby converting an alternating current into a direct current.

[0089] In other embodiments of the present application, a household outlet is generally adopted during AC charging, and the general AC power is generally 7 kilowatts (kW). During DC charging, a dedicated charging stand is generally adopted, and its power is generally 60kW to 150kW. Moreover, a high-speed DC charging stand with a power of 100kW or more is a development trend. Also, the power during motor driving is generally about 100kW. Therefore, as can be seen from the above description, the vehicle has a large power level difference in three situations: motor driving, DC charging, and AC charging. The power difference is very important for the selection of power switches.

[0090] In this embodiment, the type of the power switch in the bridge converter 13 and the type of the power switch in the bidirectional bridge 18 may be the same or different. Specifically, since high-power power switches are more expensive than low-power power switches, considering the different powers required when the energy conversion device 1 operates in the motor drive mode, DC charging mode, and AC charging mode, the type of the power switch in the bridge converter 13 and the type of the power switch in the bidirectional bridge 18 may be different. That is, the bidirectional bridge 18 and the bridge converter 13 may adopt power switches of different power levels (for example, MOSFET power switches with a high current level, MOSFET power switches with a low current level) or different types of switches (for example, high-power IGBT power switches, low-power MOSFET power switches). Specifically, in this embodiment, high-power modes such as DC charging and motor drive both use the bridge converter 13. Therefore, the bridge converter 13 in this embodiment is realized by a high-power IGBT power switch or a MOSFET power switch with a high current level. The bidirectional bridge 18 mainly operates during AC charging and is realized by a low-power MOSFET. In this way, the effective operation of the energy conversion device 1 can be guaranteed while reducing the circuit cost.

[0091] On the other hand, during AC charging, since the switching frequency required for the bidirectional bridge 18 is high (for example, 60 kHz), it is necessary to adopt a highly efficient MOSFET power switch or a silicon carbide MOSFET power switch when realizing high-frequency operation. The bridge converter 13 has a three-phase bridge and its operation mode is three-phase interleaved control. Therefore, since the frequency required for the power switch of the bridge converter 13 is low, the type of the power switch in the bridge converter 13 and the type of the power switch in the bidirectional bridge 18 may be different.

[0092] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 17, the energy conversion device 1 further includes a switch module 19.

[0093] Specifically, the switch module 19 includes a first switch unit 191, a second switch unit 192, and a third switch unit 193. The first switch unit 191 is provided between the AC charging port 21 and the first rectification module 17a. The second switch unit 192 is provided between the DC charging port 21 and the bridge converter 13. The third switch unit 193 is provided between the motor coil 41 and the bridge converter 13.

[0094] In another embodiment of the present application, the first switch unit 191 includes a switch K1 and a switch K2. One end of the switch K1 is connected to the AC charging port 21, and the other end is connected to the first rectification module 17a. One end of the switch K2 is connected to the AC charging port 21, and the other end is connected to the first rectification module 17a. The second switch unit 192 includes a switch K3 and a switch K4. One end of the switch K3 is connected to the DC charging port 22, and the other end is connected to the inductor 12. One end of the switch K4 is connected to the DC charging port 22, and the other end is connected to the first phase bridge 131. The third switch unit 193 includes a switch K5, a switch K6, and a switch K7. One end of the switch K5 is connected to the first intermediate point, and the other end is connected to the first phase coil. One end of the switch K6 is connected to the second intermediate point, and the other end is connected to the second phase coil. One end of the switch K7 is connected to the third intermediate point, and the other end is connected to the third phase coil.

[0095] It should be noted that in this embodiment, in the AC charging circuit composed of the AC charging port 21, the first rectification module 17a, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3, the first rectification module 17a may adopt the same circuit structure as the second rectification module 17b, or may be another circuit having a rectification function.

[0096] In this embodiment, when the switches K1 and K2 in the first switch unit 191 are closed, the switches K3 and K4 in the second switch unit 192 are opened, and the switches K5, K6, and K7 in the third switch unit 193 are opened, the AC charging port 21, the first rectification module 17a, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 form an AC charging circuit.

[0097] In this embodiment, when the switches K1 and K2 in the first switch unit 191 are opened, the switches K3 and K4 in the second switch unit 192 are closed, and the switches K5, K6, and K7 in the third switch unit 193 are opened, the DC charging port 22, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 form a DC charging circuit, or the DC charging port 22, the inductor 12, the first phase bridge 131, and the external battery 3 form a DC charging circuit.

[0098] In this embodiment, when the switches K1 and K2 in the first switch unit 191 are opened, the switches K3 and K4 in the second switch unit 192 are opened, and the switches K5, K6, and K7 in the third switch unit 193 are closed, the external battery 3, the bridge converter 13, and the external motor 4 form a motor drive circuit.

[0099] Note that in the energy conversion device 1, a contactor switch is provided between the external battery 3 and the bridge converter 13. When the contactor switch is in the closed state, the external battery 3, the bridge converter, and the external motor 4 form a motor drive circuit.

[0100] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 18, the energy conversion device 1 further includes a resistor R1, and the switch module 19 in the energy conversion device 1 further includes a fourth switch unit 194.

[0101] Specifically, the fourth switch unit 194 includes a switch K8, a switch K9, and a switch K10. One end of the switch K8 and one end of the switch K9 are connected to the first bidirectional H-bridge 15. The other end of the switch K8 is connected to one end of the resistor R1. The other end of the switch K9 and the other end of the resistor R1 are connected to one end of the external battery 3. One end of the switch K10 is connected to the first bidirectional H-bridge 15, and the other end is connected to the other end of the external battery 3. In another embodiment of the present application, one end of the switch K8 and one end of the switch K9 are connected to the third bus end of the first bidirectional H-bridge 15, and one end of the switch K10 is connected to the fourth bus end of the first bidirectional H-bridge 15.

[0102] In this embodiment, the switch K8 and the resistor R1 in the energy conversion device 1 constitute a pre-charging module. When the switches K1 and K2 in the first switch unit 191 are closed, the switches K3 and K4 in the second switch unit 192 are opened, and the switches K5, K6, and K7 in the third switch unit 193 are opened, or when the switches K1 and K2 in the first switch unit 191 are opened, the switches K3 and K4 in the second switch unit 192 are closed, and the switches K5, K6, and K7 in the third switch unit 193 are opened, the switch K8 is closed. After the pre-charging is completed by R1, the switches K9 and K10 are closed. By performing pre-charging with R1, it is possible to prevent the switches K9 and K10 from failing, and further reduce the failure rate of the energy conversion device 1.

[0103] In this embodiment, in the energy conversion device 1, by controlling the on / off states of the switch units in the switch module 19, the switching of the operation mode of the energy conversion device 1 can be realized.

[0104] To better understand the content of this application, taking the energy conversion device 1 shown in FIG. 19 as an example below, the operating principle of the energy conversion device 1 according to this application will be specifically described and explained in detail as follows.

[0105] Specifically, as shown in FIG. 19, when the energy conversion device 1 performs AC charging, the switches K1 and K2 are closed, the switches K3, K4, K5, K6, and K7 are opened, and at the same time, the contactor switch between the external battery 3 and the bridge converter 13 is opened. After the pre-charging is completed by the switches K8 and the resistor R1, the switches K9 and K10 are closed. At this time, the AC charging port 21 inputs an alternating current, the first rectification module 17a rectifies the alternating current and outputs a direct current. The inductor 12, the first power switch Q1, and the second power switch Q2 complete the PFC, and the third power switch Q3, the fourth power switch Q4, the fifth power switch Q5, and the sixth power switch Q6 realize the direct current to alternating current (hereinafter abbreviated as DC-AC) conversion. The third power switch Q3 and the fourth power switch Q4 output a high-frequency AC positive wave, and the fifth power switch Q5 and the sixth power switch Q6 output a high-frequency AC negative wave. The transformer unit 14 and the first bidirectional H-bridge 15 perform a voltage conversion and rectification process on the high-frequency AC current output from the bridge converter 13 to realize the alternating current to direct current (hereinafter abbreviated as AC-DC) conversion and output a DC voltage. The fourth capacitor C4 filters the DC voltage to charge the external battery 3.

[0106] Alternatively, as shown in FIG. 19, when the energy conversion device 1 performs AC charging, switches K1 and K2 are closed, and switches K3, K4, K5, K6, and K7 are open. At the same time, the contactor switch between the external battery 3 and the bridge converter 13 is closed. Pre-charging is completed by switch K8 and resistor R1, and then switches K9 and K10 are closed. At this time, AC charging port 21 inputs AC current, and the first rectifier module 17a rectifies the AC current and outputs DC current. PFC is completed by inductor 12, first power switch Q1, and second power switch Q2. The first power switch Q1 rectifies and filters the DC voltage through the first capacitor C1, which then charges the external battery 3.

[0107] In this embodiment, the energy conversion device 1 of the present application controls the on / off of each switch so that the AC current received by the AC charging port 21 passes through the first rectifier module 17a, the inductor 12, the bridge converter 13, the first capacitor C1, the transformer unit 14, the first bidirectional H-bridge 15, and the fourth capacitor C4, before AC charging the external battery 3. The AC charging method is not limited to one method, that is, the AC charging method of the energy conversion device 1 has a margin and can self-adjust the operating voltage, thereby improving the charging efficiency and effectively ensuring the AC charging function of the energy conversion device 1.

[0108] In other embodiments of the present application, as shown in FIG. 19, when the energy conversion device 1 performs DC charging, switches K3 and K4 are closed, switches K1, K2, K5, K6, and K7 are opened, and at the same time, the contactor switch between the external battery 3 and the bridge converter 13 is opened. After the pre-charging is completed by switches K8 and resistor R1, switches K9 and K10 are closed. At this time, the DC charging port 22 outputs a DC current, and the PFC is completed by the inductor 12, the first power switch Q1, and the second power switch Q2. At the same time, the DC-AC conversion is realized by the third power switch Q3, the fourth power switch Q4, the fifth power switch Q5, and the sixth power switch Q6. The third power switch Q3 and the fourth power switch Q4 output a high-frequency AC positive wave, and the fifth power switch Q5 and the sixth power switch Q6 output a high-frequency AC negative wave. The transformer unit 14 and the first bidirectional H-bridge 15 perform voltage transformation and rectification processing on the high-frequency AC current output from the bridge converter 13 to realize AC-DC conversion and output a DC voltage. The fourth capacitor C4 filters the DC voltage to charge the external battery 3.

[0109] Alternatively, as shown in FIG. 19, when the energy conversion device 1 performs DC charging, switches K3 and K4 are closed, switches K1, K2, K5, K6, and K7 are opened, and at the same time, the contactor switch between the external battery 3 and the bridge converter 13 is closed. After the pre-charging is completed by switches K8 and resistor R1, switches K9 and K10 are closed. At this time, the DC charging port 22 outputs a DC current, and the PFC is completed by the inductor 12, the first power switch Q1, and the second power switch Q2. The first power switch Q1 rectifies the current, and the first capacitor C1 filters the DC voltage to charge the external battery 3.

[0110] In another embodiment of the present application, as shown in FIG. 19 , when the energy conversion device 1 operates in a motor driving mode, the switches K5, K6, and K7 are closed, and the switches K1, K2, K3, K4, K8, K9, and K10 are open. At the same time, the contactor switch between the external battery 3 and the bridge converter 13 is closed. At this time, the external battery 3 outputs a high-voltage DC current, which is converted into a three-phase AC current by the three-phase motor driving bridge of the bridge converter 12, and the three-phase AC current is output to the three-phase windings of the motor coil 41, thereby driving the external motor 4.

[0111] Furthermore, as shown in FIG. 20, the transformer unit 14 of the energy conversion device 1 further includes a second secondary coil T2.

[0112] When the energy conversion device 1 performs DC charging or AC charging, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, and the second bidirectional H-bridge 16 form a charging circuit that charges the storage battery or an electrical device connected to the on-board discharge port.

[0113] In another embodiment of the present application, the energy conversion device 1 can further operate in a discharge mode. In order to better understand the operating principle of the present application, the operating principle of the present application will be described below using the energy conversion device 1 shown in Figure 20 as an example.

[0114] Specifically, as shown in FIG. 20, when the energy conversion device 1 operates in AC discharge mode, the switches K1, K2, K9, and K10 are closed, and the switches K3, K4, K5, K6, and K7 are opened, so that the high-voltage DC current output from the external battery 3 is discharged to the outside through the AC charging port 22 by the action of the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, and the inductor 12.

[0115] In another embodiment of the present application, as shown in FIG. 20, when the energy conversion device 1 operates in the DC discharge mode, the switches K3, K4, K9, and K10 are closed, and the switches K1, K2, K5, K6, and K7 are opened. As a result, the high-voltage DC current output from the external battery 3 is discharged to the outside through the DC charging port 22 under the action of the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, and the inductor 12.

[0116] In another embodiment of the present application, as shown in FIG. 20, when the energy conversion device 1 discharges through a storage battery or an in-vehicle discharge port, the switches K1 and K2 are closed, and the switches K3, K4, K5, K6, K7, K8, K9, and K10 are opened. The AC charging port 21, the first rectification module 17a, the inductor 12, the bridge converter 13, the primary coil T0, the second secondary coil T2, the second bidirectional H-bridge 16, and the storage battery or the in-vehicle discharge port constitute an AC discharge circuit. Alternatively, the switches K3 and K4 are closed, and the switches K1, K2, K5, K6, K7, K8, K9, and K10 are opened. The DC charging port 22, the first rectification module 17a, the inductor 12, the bridge converter 13, the primary coil T0, the second secondary coil T2, the second bidirectional H-bridge 16, and the storage battery or the in-vehicle discharge port constitute a DC discharge circuit. Alternatively, the switches K9 and K10 are closed, and the switches K1, K2, K3, K4, K5, K6, K7, and K8 are opened. The external battery 3, the bridge converter 13, the primary coil T0, the second secondary coil T2, the second bidirectional H-bridge 16, and the storage battery or the in-vehicle discharge port constitute a discharge circuit for the external battery 3.

[0117] Note that in this embodiment, since the principles of the AC discharge operation mode and the AC charging operation mode of the energy conversion device 1 are opposite, the specific operation principle of the AC discharge operation mode of the energy conversion device 1 can refer to the specific operation process of its AC charging mode, and the description is omitted here.

[0118] In this embodiment, the energy conversion device 1 according to the present application integrates an inductor 12, a bridge converter 13, a transformer unit 14, and a first bidirectional H-bridge 15 in one circuit, so that the bridge converter 13 can be used to realize the drive of the external motor 4. Furthermore, the first phase bridge 131 in the bridge converter 13 is used to cooperate with the inductor 12 to realize PFC, and at the same time, the voltage output from the first phase bridge 131 can be increased. Also, the second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 are used to convert direct current into alternating current, and at the same time, the energy conversion device 1 can perform AC charging and discharging and DC charging and discharging of the vehicle battery. The bridge converter 13 is multiplexed to simplify the circuit structure, improve the integration degree of the circuit, reduce the circuit cost, reduce the volume of the circuit, and simplify the circuit structure.

[0119] In addition, the energy conversion device 1 according to the present application can not only operate in the AC charging mode, but also operate in the AC discharge mode, so as to increase the charging application scenarios and expand the application range.

[0120] As shown in FIG. 21, the present application further provides a power system 5, and the power system 5 includes an energy conversion device 1 including an on-vehicle charging module 51, a motor control module 52, and a bidirectional DC / DC module 53, and a control module 54.

[0121] The in-vehicle charging module 51 includes an inductor 12 connected to the external charging port 2. The motor control module 52 includes a bridge converter 13 connected to the external charging port 2, the inductor 12, the external motor 4, and the external battery 3 respectively. The bidirectional DC / DC module 53 includes a transformer unit 14 and a first bidirectional H-bridge 15. One end of the transformer unit 14 is connected to the bridge converter 13, the other end is connected to one end of the first bidirectional H-bridge 15, and the other end of the first bidirectional H-bridge 15 is connected to the external battery 3. The control module 54 is connected to the bridge converter 13 and the first bidirectional H-bridge 15 respectively, and controls a drive circuit composed of the external battery 3, the bridge converter 13, and the external motor 4, and a charging circuit composed of the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3.

[0122] In another embodiment of the present application, the energy conversion device 1 in the system 5 further includes a switch module 19, and the control module 54 realizes the switching between the charging mode and the driving mode by controlling the switch module 19.

[0123] Each switch unit in the switch module 19 can refer to FIGS. 18 and 19, and the control module 54 switches the operation mode of the energy conversion device 1 by controlling each switch unit in the switch module 19 and the power switch in the energy conversion device 1.

[0124] Specifically, when the energy conversion device 1 operates in the driving mode, the external battery 3 drives the external motor 4 to operate through the bridge converter 13. Specifically, the external battery 3 supplies a direct current to the bridge converter 13. The first phase bridge 131 in the bridge converter 13 converts the direct current into a three-phase alternating current, inputs the three-phase alternating current to the external motor 4 to drive the external motor 4 to operate. The external motor 4 outputs an alternating current, and is converted into a direct current through the second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 and then output, and is refluxed to the external battery 3.

[0125] In another embodiment of the present application, when the energy conversion device 1 operates in the charging mode, specifically, in the charging mode, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, and the first bidirectional H-bridge 15 constitute a charging circuit for charging the external battery 3.

[0126] The power supply supplied from the external charging port 2 is a direct current power supply. When the power supply supplied from the external charging port 2 is a direct current power supply, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute a direct current charging circuit. At this time, the inductor 12 and the first phase bridge 131 in the bridge converter 13 boost the direct current output from the external charging port 2 and output a direct current. The second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 convert the direct current output from the first phase bridge 131 into an alternating current and output it. The transformer unit 14 converts the high-frequency alternating current and outputs another high-frequency alternating current. The first bidirectional H-bridge 15 rectifies the high-frequency alternating current output from the transformer unit 14 and outputs a direct current to charge the external battery 3.

[0127] Alternatively, the external charging port 2, inductor 12, first phase bridge 131, and external battery 3 form a DC charging circuit, in which the inductor 12 and the first phase bridge 131 in the bridge converter 13 boost the DC current output from the external charging port 2 and output the DC current to charge the external battery 3.

[0128] In addition, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12 and the DC charging port 22 form a DC discharge circuit, or the external battery 3, the first phase bridge 131, the inductor 12 and the DC charging port 22 form a DC discharge circuit.

[0129] In this embodiment, the principles of the DC discharge operation mode and the DC charge operation mode are reversed. The specific operation principle of the DC discharge operation mode can be referred to the specific operation process of the DC charge mode, and the description thereof will be omitted here.

[0130] In a specific implementation, the DC power source or the AC power source supplies DC current or AC current to the power system 5 via the external charging port 2, and the DC power source may be DC current obtained by rectifying the external AC power source or DC current output by an external charging station; no specific limitations are imposed here.

[0131] In this embodiment, by adopting a power system 5 including an energy conversion device 1 and a control module 54, the power system 5 can operate in a driving mode and a DC charging mode in a time-sharing manner, and adopts the same circuit structure to drive the vehicle motor and charge the battery, resulting in a high circuit integration and a simple circuit structure, which reduces circuit costs and circuit volume and solves the problems of the conventional motor driving and charging system, such as a complex circuit structure, low integration, large volume and high cost.

[0132] In another embodiment of the present application, as one embodiment of the present application, the energy conversion device 1 in the power system 5 further includes a first rectification module 17a. At this time, the external charging port 2 is an AC charging port 21.

[0133] Specifically, the first rectification module 17a is respectively connected to the AC charging port 21, the inductor 12, and the bridge converter 13. By controlling the on / off states of the switches in the switch module by the control module 54, the switching between the AC charging mode and the driving mode is realized. When switched to the AC charging mode, the control module 54 controls an AC charging circuit composed of the AC charging port 21, the first rectification module 17a, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3, or an AC charging circuit composed of the AC charging port 21, the first rectification module 17a, the inductor 12, the first phase bridge 131, and the external battery 3. When switched to the driving mode by the control module 54, the external battery 3, the bridge converter 13, and the external motor 4 constitute a driving circuit.

[0134] In another embodiment of the present application, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, the first rectification module 17a, and the AC charging port 21 constitute an AC discharge circuit, or the external battery 3, the first phase bridge 131, the inductor 12, the first rectification module 17a, and the AC charging port 21 constitute an AC discharge circuit. In the above AC discharge circuit, by switching the power switch in the first rectification module 17a, the direct current is converted into an alternating current and discharged from the AC charging port 21.

[0135] In this embodiment, the first rectification module 17a rectifies the alternating current output from the AC charging port 21 into a direct current to charge the external battery 3, or the first rectification module 17a converts the direct current into an alternating current to discharge from the AC charging port 21.

[0136] In another embodiment of the present application, as one embodiment of the present application, the energy conversion device 1 in the power system 5 further includes a second rectification module. At this time, the external charging port 2 includes an AC charging port 21 and a DC charging port 22.

[0137] Specifically, the second rectification module is respectively connected to the AC charging port 21, the inductor 12, and the bridge converter 13, and the DC charging port 22 is respectively connected to the inductor 12 and the bridge converter 13. By controlling the on / off state of each switch in the switch module by the control module 54, the switching between the AC charging mode, the DC charging mode, and the driving mode is realized. When switched to the AC charging mode, the AC charging port 21, the second rectification module 17b, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 form an AC charging circuit, or the AC charging port 21, the second rectification module 17b, the inductor 12, the first phase bridge 131, and the external battery 3 form an AC charging circuit.

[0138] In another embodiment of the present application, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, the second rectification module 17b, and the AC charging port 21 form an AC discharge circuit, or the external battery 3, the first phase bridge 131, the inductor 12, the second rectification module 17b, and the AC charging port 21 form an AC discharge circuit. In the above AC discharge circuit, by switching the power switch in the second rectification module 17b, the DC current is converted into an AC current and discharged from the AC charging port 21.

[0139] When switched to the DC charging mode, the DC charging port 22, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 form a DC charging circuit, or the DC charging port 22, the inductor 12, the first phase bridge of the bridge converter 13, and the external battery 3 form a DC charging circuit.

[0140] In other embodiments of the present application, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit, or the external battery 3, the first phase bridge 131, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit.

[0141] When switched to the driving mode, the external battery 3, the bridge converter 13, and the external motor 4 constitute a driving circuit.

[0142] In this embodiment, the second rectification module 17b rectifies the alternating current output from the AC charging port 21 into direct current to charge the external battery 3, or the second rectification module 17b converts the direct current into alternating current to discharge from the AC charging port 21.

[0143] In other embodiments of the present application, as one embodiment of the present application, the energy conversion device 1 in the power system 5 further includes a bidirectional bridge 18.

[0144] Specifically, the bidirectional bridge 18 is connected to the external charging port 2 and the bridge converter 13 respectively. By controlling the on / off states of the switches in the switch module by the control module 54, the switching between the AC charging mode, the DC charging mode, and the driving mode is realized. When switched to the AC charging mode, the AC charging port 21, the inductor 12, the bridge converter 13, the bidirectional bridge, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute an AC charging circuit.

[0145] In other embodiments of the present application, the external battery 3, the first bidirectional H-bridge, the transformer unit 14, the bidirectional bridge 18, the bridge converter 13, the inductor 12, and the AC charging port 21 constitute an AC discharge circuit. In the AC discharge circuit, the bidirectional bridge 18 and the first phase bridge 131 cooperate to form a bidirectional H-bridge, and discharge from the AC charging port 21 by converting direct current into alternating current.

[0146] When switched to the DC charging mode, the DC charging port 21, inductor 12, bridge converter 13, transformer unit 14, first bidirectional H-bridge 15, and external battery 3 form a DC charging circuit. Alternatively, the DC external charging port 2, inductor 12, first phase bridge, and external battery 3 form a DC charging circuit.

[0147] In other embodiments of the present application, the external battery 3, first bidirectional H-bridge 15, transformer unit 14, bridge converter 13, inductor 12, and DC charging port 22 form a DC discharging circuit. Alternatively, the external battery 3, first phase bridge 131, inductor 12, and DC charging port 22 form a DC discharging circuit.

[0148] When switched to the driving mode, the external battery 3, bridge converter 13, and external motor 4 form a driving circuit.

[0149] In this embodiment, the AC charging port 21, inductor 12, bridge converter 13, bidirectional bridge 18, transformer unit 14, first bidirectional H-bridge 15, and external battery 3 form an AC charging circuit. In the energy conversion device 1, the bidirectional bridge 18 and the first phase bridge in the bridge converter 13 cooperate to form a bidirectional H-bridge, convert the AC current into a DC current, and then use the second phase bridge and the third phase bridge in the bridge converter 13 to convert the DC current into an AC current. As a result, the transformer unit 14 receives a high-frequency AC current and then rectifies it into a DC current by the first bidirectional H-bridge 15 to charge the external battery 3.

[0150] In other embodiments of the present application, as one embodiment of the present application, as shown in FIG. 22, the in-vehicle charging module 51, the motor control module 52, and the bidirectional DC / DC module 53 are integrated in the first case 6. In other embodiments of the present application, the in-vehicle charging module 51, the motor control module 52, and the bidirectional DC / DC module 53 may be provided separately in two or three cases, and no specific limitation is imposed here.

[0151] In other embodiments of the present application, as one embodiment of the present application, the power system 5 further includes a first capacitor C1 connected in parallel to the motor control module 52 and integrated in the first case 6.

[0152] Specifically, when the power system 5 operates in the DC charging mode or the AC charging mode, when the power system 5 operates, in addition to filtering the voltage output from the motor control module 52 in the DC charging process or the AC charging process of the external battery 3, the first capacitor C1 stores energy based on the voltage output from the motor control module 52, so that the DC charging or AC charging of the external battery 3 can be completed.

[0153] In this embodiment, by providing the first capacitor in the power system 5, in addition to filtering the voltage output from the motor control module 52 or the motor control module 52 and the in-vehicle charging module 51, the first capacitor C1 can simultaneously store energy based on the voltage output from the motor control module 52 or the motor control module 52 and the in-vehicle charging module 51, so that the DC charging or AC charging of the external battery 3 can be completed. Thereby, the normal charging function of the power system 5 is guaranteed, and it can be further guaranteed that other clutters do not interfere with the charging process.

[0154] In this embodiment, by integrating the in-vehicle charging module 51, the motor control module 52, and the bidirectional DC / DC module 53 into the first case 6, the overall structure of the power system 5 can be made more compact, and further, the volume of the power system 5 can be reduced, thereby reducing the weight of the vehicle to which the power system 5 is applied.

[0155] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 22, the power system 5 further includes a speed reducer 56 coupled to the motor in a power transmissible manner, and the speed reducer 56 and the motor are integrated into the second case 7.

[0156] In another embodiment of the present application, as one embodiment of the present application, the first case 6 and the second case 7 are fixedly connected.

[0157] Specifically, when implementing, the first case 6 and the second case 7 may be connected by adopting any connecting member having a fixing effect, or the first case 6 is provided with a fixing member connectable to the second case 7, or the second case 7 is provided with a fixing member connectable to the first case 6, and no specific limitation is made here.

[0158] In this embodiment, by fixing the first case 6 and the second case 7, the separation between the first case 6 and the second case 7 can be effectively prevented, thereby ensuring that the in-vehicle charging module 51, the motor control module 52, the bidirectional DC / DC module 53, the external motor 4, and the speed reducer 56 do not malfunction due to the dropping of the case, and improving the operation reliability and stability of the power system 5.

[0159] It should be noted that in this embodiment, for the specific operation process of the detailed operation principle of the energy conversion device 1, the control module 54, and the switch module in the power system 5, reference can be made to the detailed description of the energy conversion device 1 mentioned above, and the description is omitted here.

[0160] In the present application, the vehicle according to the present application adopts a power system 5 including an in-vehicle charging module 51, a motor control module 52, and a bidirectional DC / DC module 53. When applying the power system 5, it operates in a drive mode, a DC charging mode, and an AC charging mode in a time-division manner, and further adopts the same circuit configuration to realize driving the motor of the vehicle and charging the battery. The circuit integration degree is high, and the circuit structure is simple. Thereby, the circuit cost is reduced, the circuit volume is decreased, and the problems that the overall structure of the circuits of the conventional motor drive and charging system is complex, the integration degree is low, the volume is large, and the cost is high are solved.

[0161] As shown in FIG. 23, the present application further provides an energy conversion device 8 including a charging connection terminal group 81, a bridge converter 13, an inductor 12, a drive output connection terminal group 82, a transformer unit 14, a first bidirectional H-bridge 15, and an energy storage connection terminal group 83.

[0162] Specifically, as shown in FIG. 23, the charging connection terminal group 81 includes a first charging connection terminal 811 and a second charging connection terminal 812. The bridge converter 13 includes a first phase bridge 131, a second phase bridge 132, and a third phase bridge 133. The first phase bridge 131, the second phase bridge 132, and the third phase bridge 133 are connected in parallel to form a first bus terminal and a second bus terminal. The second bus terminal is connected to the second charging connection terminal 812. One end of the inductor 12 is connected to the first charging connection terminal 811, and the other end is connected to the midpoint of the first phase bridge 131. The drive output connection terminal group 82 includes a first drive output connection terminal 821, a second drive output connection terminal 822, and a third drive output connection terminal 823. The first drive output connection terminal 821 is connected to the midpoint of the first phase bridge 131. The second drive output connection terminal 822 is connected to the midpoint of the second phase bridge 132. The third drive output connection terminal 823 is connected to the midpoint of the third phase bridge 133. The input ends of the transformer unit 14 are respectively connected to the midpoints of the second phase bridge 132 and the third phase bridge 133. The input end of the first bidirectional H-bridge 15 is connected to the output end of the transformer unit. The energy storage connection terminal group 83 includes a first energy storage connection terminal 831 and a second energy storage connection terminal 832. The first energy storage connection terminal 831 is connected to the first bus terminal. The second energy storage connection terminal 832 is connected to the second bus terminal. The output ends of the first bidirectional H-bridge 15 are respectively connected to the first energy storage connection terminal 831 and the second energy storage connection terminal 832.

[0163] In other embodiments of the present application, the first charging connection terminal 811 and the second charging connection terminal 812 in the charging connection terminal group 81 may be respectively connected to the external charging port 2. The first drive output connection terminal 821, the second drive output connection terminal 822, and the third drive output connection terminal 823 in the drive output connection terminal group 82 may be respectively connected to the external motor 4. The first energy storage connection terminal 831 and the second energy storage connection terminal 832 in the energy storage connection terminal group 83 may be respectively connected to the external battery 3.

[0164] In this embodiment, the charging connection terminal group 81 supplies power to the inductor 12 and the bridge converter 13. The inductor 12, the bridge converter 13, the transformer unit 14, and the first bidirectional H-bridge 15 constitute a charging circuit for charging the external battery 3 through the energy storage connection terminal group 83. The external battery 3 and the bridge converter 13 supply power to the external motor 4 through the drive output connection terminal group 82 and the energy storage connection terminal group 83 to drive the external motor 4.

[0165] In another embodiment of the present application, as one embodiment of the present application, the charging connection terminal group 81 is connected to the external charging port 2 and adopts one of a connection line, a connector, or a connection interface. The drive output connection terminal group 82 is connected to the external motor 4 and adopts one of a connection line, a connector, or a connection interface. The energy storage connection terminal group 83 is connected to the external battery 3 and adopts one of a connection line, a connector, or a connection interface.

[0166] In another embodiment of the present application, as one embodiment of the present application, the first drive output connection terminal 821, the second drive output connection terminal 822, and the third drive output connection terminal 823 are respectively connected to the first phase coil, the second phase coil, and the third phase coil in the motor coil 41 of the external motor 4, and all include a drive connection line, a drive output connector, or an energy storage connection interface.

[0167] In another embodiment of the present application, as one embodiment of the present application, the external battery 3 is respectively connected to a first energy storage connection terminal 831 and a second energy storage connection terminal 832, both of which include an energy storage connection line, an energy storage connector, or an energy storage connection interface.

[0168] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 24, the first phase bridge 131 includes a first power switch Q1 and a second power switch Q2 connected in series, and the second phase bridge 132 includes a third power switch Q3 and a fourth power switch Q4 connected in series, and the third phase bridge 133 includes a fifth power switch Q5 and a sixth power switch Q6 connected in series.

[0169] Specifically, a first intermediate point between the first power switch Q1 and the second power switch Q2 is connected to the inductor 12, a second intermediate point between the third power switch Q3 and the fourth power switch Q4 is connected to the transformer unit 14, a third intermediate point between the fifth power switch Q5 and the sixth power switch Q6 is connected to the transformer unit 14, the first ends of the first power switch Q1, the third power switch Q3, and the fifth power switch Q5 are commonly connected to form a first bus end of the bridge converter 13, and the second ends of the second power switch Q2, the fourth power switch Q4, and the sixth power switch Q6 are commonly connected to form a second bus end of the bridge converter 13.

[0170] In this embodiment, by controlling the three-phase bridge of the bridge converter 13 by means of a three-phase interleaved control operation method, when the energy conversion device 1 is charging, the DC side ripple decreases and the charging power increases. Also, in the charging mode, the first phase bridge 131 cooperates with the inductor 12 to complete PFC, boost by the first power switch Q1, and output a DC voltage. By controlling the cooperative action of the power switches in the second phase bridge 132 and the third phase bridge 133, the second phase bridge 132 and the third phase bridge 133 can convert the DC current into a high-frequency AC current. In the driving mode, by controlling the three-phase bridge in the bridge converter 13, the electrical energy input from the external battery 3 is converted, the voltage and current of the motor coil 41 are adjusted, and the driving of the external motor 4 is realized.

[0171] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 25, the transformer unit 14 in the energy conversion device 8 further includes a primary coil T0 and a first secondary coil T1.

[0172] As shown in FIG. 25, one end of the primary coil T0 is connected to the second intermediate point, the other end of the primary coil T0 is connected to the third intermediate point, and the first secondary coil T1 is connected to the first bidirectional H-bridge 15.

[0173] In this embodiment, by adopting the transformer unit 14 including the primary coil T0 and the first secondary coil T1, in the configured DC charging circuit, the input high-frequency alternating current is converted into another high-frequency alternating current and output, and the separation of the circuits on both sides of the transformer unit 14 is realized, and the electrostatic interference generated between the circuits on both sides can be avoided. At the same time, in the DC charging circuit, the second phase bridge 132 and the third phase bridge 133 are multiplexed, and the DC current is converted into an alternating current, so as to simplify the circuit structure, reduce the volume, and achieve the purpose of reducing the cost.

[0174] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 26, the transformer unit 14 in the energy conversion device 8 includes a second secondary coil T2.

[0175] Specifically, when the second secondary coil T2 is connected to the storage battery or the in-vehicle discharge port by the second bidirectional H-bridge 16 and charges the storage battery, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, and the second bidirectional H-bridge 16 constitute a charging circuit for the storage battery. When the external charging port 2 is connected to the charging device and the in-vehicle discharge port is connected to the electrical equipment, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, and the second bidirectional H-bridge 16 constitute a charging circuit for the electrical equipment. When the external charging port 2 is not connected to the charging device and the in-vehicle discharge port is connected to the electrical equipment, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, and the second bidirectional H-bridge 16 constitute a discharge circuit for the electrical equipment.

[0176] In this embodiment, by adopting the transformer unit 14 including the primary coil T0, the first secondary coil T1, and the second secondary coil T2, when the energy conversion device 1 operates, the external charging port 2, the inductor 12, the bridge converter 13, the primary coil T0, the second secondary coil T2, the second bidirectional H-bridge 16, and the storage battery or the in-vehicle discharge port can constitute a storage battery charging circuit or an in-vehicle discharge port circuit. Furthermore, when the DC charging circuit and the storage battery charging circuit or the in-vehicle discharge port circuit operate, they do not interfere with each other, improving the reliability of the circuit, and the external battery 3 can discharge the electrical equipment connected to the in-vehicle discharge port, increasing the function of the entire control circuit.

[0177] Note that the structure and connection method of the second bidirectional H-bridge 16 are as shown in FIG. 11.

[0178] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 27, the first bidirectional H-bridge 15 in the energy conversion device 8 includes a seventh phase bridge 151 and an eighth phase bridge 152.

[0179] The seventh phase bridge 151 includes a seventh power switch Q7 and an eighth power switch Q8 connected in series, and the eighth phase bridge 152 includes a ninth power switch Q9 and a tenth power switch Q10 connected in series.

[0180] A fourth intermediate point between the seventh power switch Q7 and the eighth power switch Q8 is connected to one end of the first secondary coil T1, a fifth intermediate point between the ninth power switch Q9 and the tenth power switch Q10 is connected to the other end of the first secondary coil T1, the first ends of the seventh power switch Q7 and the ninth power switch Q9 are commonly connected to form the third bus end of the first bidirectional H-bridge 15, the second ends of the eighth power switch Q8 and the tenth power switch Q10 are commonly connected to form the fourth bus end of the first bidirectional H-bridge 15, the third bus end is connected to the first energy storage connection end 831, and the fourth bus end is connected to the second energy storage connection end 832.

[0181] In this embodiment, the external charging port 2, the inductor 12, the first phase bridge 131, the second phase bridge 132, the third phase bridge 133, the primary coil T0, the first secondary coil T1, the seventh power switch Q7, the eighth power switch Q8, the ninth power switch Q9, the tenth power switch Q10, and the external battery 3 constitute a DC charging circuit. The seventh power switch Q7, the eighth power switch Q8, the ninth power switch Q9, and the tenth power switch Q10 constitute a full-bridge rectifier circuit. By rectifying the high-frequency alternating current output from the first secondary coil T1 into a direct current by the full-bridge rectifier circuit and outputting a DC voltage having high-frequency energy, the external battery 3 is charged.

[0182] In addition, in this embodiment, the external battery 3, the eighth power switch Q8, the ninth power switch Q9, the tenth power switch Q10, the transformer unit 14, the bridge converter 13, the inductor 12, and the external charging port 2 constitute a DC discharge circuit, and the seventh power switch Q7, the eighth power switch Q8, the ninth power switch Q9, and the tenth power switch Q10 constitute a full-bridge rectifier circuit, which converts the DC current input from the external battery 3 into an AC current by the full-bridge circuit.

[0183] It should be noted that the operating principles of the energy conversion device 8 and the above-mentioned energy conversion device 1 are the same, and the connection relationship and structure among the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the second bidirectional H-bridge 16 are the same. Therefore, the operating principle of the energy conversion device 8 will not be described in detail here.

[0184] In this embodiment, the energy conversion device 8 according to the present application integrates the charging connection terminal group 81, the bridge converter 13, the inductor 12, the drive output connection terminal group 82, the transformer unit 14, the first bidirectional H-bridge 15, and the energy storage connection terminal group 83 into one circuit, so that the drive to the external motor 4 can be realized by using the bridge converter 13. Furthermore, by using the first phase bridge 131 in the bridge converter 13 to cooperate with the inductor 12, PFC can be realized, and at the same time, the voltage output from the first phase bridge 131 can be increased. Also, by using the second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 to convert the DC current into an AC current, the AC charging and discharging and DC charging and discharging of the vehicle battery can be performed by the energy conversion device 8 at the same time. The bridge converter 13 is multiplexed to simplify the circuit structure, improve the integration degree of the circuit, reduce the circuit cost, reduce the volume of the circuit, and simplify the circuit structure.

[0185] In addition, the energy conversion device 1 according to the present application can not only operate in the AC charging mode but also operate in the AC discharging mode, thereby increasing the charging application scenarios and expanding the application range.

[0186] As shown in FIG. 28, the present application further provides a power system 9, and the power system 9 includes an energy conversion device 8 including an in-vehicle charging module 91, a motor control module 92, and a bidirectional DC / DC module 93, and a control module 54.

[0187] The in-vehicle charging module 91 includes an inductor 12 and a charging connection terminal group 81 including a first charging connection terminal 811 and a second charging connection terminal 812. One end of the inductor is connected to the first charging connection terminal 811. The motor control module 92 includes a bridge converter 13 including a first phase bridge 131, a second phase bridge 132, and a third phase bridge 133, and a drive output connection terminal group 82. The midpoint of the first phase bridge 131 is connected to the other end of the inductor 12. The first phase bridge 131, the second phase bridge 132, and the third phase bridge 133 are connected in parallel to form a first bus terminal and a second bus terminal. The second bus terminal is connected to the second charging connection terminal 82. The drive output connection terminal group 82 includes a first drive output connection terminal 821, a second drive output connection terminal 822, and a third drive output connection terminal 823. The first drive output connection terminal 821 is connected to the midpoint of the first phase bridge 131. The second drive output connection terminal 822 is connected to the midpoint of the second phase bridge 132. The third drive output connection terminal 823 is connected to the midpoint of the third phase bridge 133. The bidirectional DC / DC module 93 includes a transformer unit 14, a first bidirectional H-bridge 15, and an energy storage connection terminal group 83. The input terminals of the transformer unit 14 are respectively connected to the midpoint of the second phase bridge 132 and the midpoint of the third phase bridge 133. The output terminal of the transformer unit 14 is connected to the input terminal of the first bidirectional H-bridge 15. The energy storage connection terminal group 83 includes a first energy storage connection terminal 831 and a second energy storage connection terminal 832. The first energy storage connection terminal 831 is connected to the first bus terminal. The second energy storage connection terminal 832 is connected to the second bus terminal. The output terminals of the first bidirectional H-bridge 15 are respectively connected to the first energy storage connection terminal 831 and the second energy storage connection terminal 832.

[0188] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 28, the first charging connection terminal 811 and the second charging connection terminal 812 are respectively connected to the external charging port 2, and the first drive output connection terminal 821, the second drive output connection terminal 822, and the third drive output connection terminal 823 are respectively connected to the first phase coil, the second phase coil, and the third phase coil in the motor coil 41 of the external motor 4. The external battery 3 is respectively connected to the first energy storage connection terminal 831 and the second energy storage connection terminal 832.

[0189] In another embodiment of the present application, the energy conversion device 8 in the system 9 further includes a switch module 19, and the control module 54 realizes the switching between the charging mode and the driving mode by controlling the switch module 19.

[0190] It should be noted that the switch modules 19 of the energy conversion device 8 and the energy conversion device 1 have the same structure, the same installation position, and the same functions. Each switch unit in the energy conversion device 8 is as shown in FIGS. 18 and 19. The control module 54 controls each switch unit in the switch module 19 and the power switch in the energy conversion device 1 to switch the operation mode of the energy conversion device 1.

[0191] Specifically, when the energy conversion device 8 operates in the driving mode, the external battery 3 drives the external motor 4 to operate through the bridge converter 13. Specifically, the external battery 3 supplies a direct current to the bridge converter 13, and the first phase bridge 131 in the bridge converter 13 converts the direct current into a three-phase alternating current, inputs the three-phase alternating current to the external motor 4 to drive the external motor 4 to operate. The external motor 4 outputs an alternating current and converts it into a direct current through the second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 and outputs it, and returns it to the external battery 3.

[0192] In another embodiment of the present application, when the energy conversion device 8 operates in the charging mode, specifically, in the charging mode, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, and the first bidirectional H-bridge 15 constitute a charging circuit for charging the external battery 3.

[0193] The power supply supplied from the external charging port 2 is a DC power supply. When the power supply supplied from the external charging port 2 is a DC power supply, the external charging port 2, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute a DC charging circuit. At this time, the first phase bridge 131 in the inductor 12 and the bridge converter 13 boosts the DC current output from the external charging port 2 and outputs a DC current. The second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 convert the DC current output from the first phase bridge 131 into an AC current and output it. The transformer unit 14 converts the high-frequency AC current and outputs another high-frequency AC current. The first bidirectional H-bridge 15 rectifies the high-frequency AC current output from the transformer unit 14 and outputs a DC current to charge the external battery 3.

[0194] Alternatively, the external charging port 2, the inductor 12, the first phase bridge 131, and the external battery 3 constitute a DC charging circuit. At this time, the first phase bridge 131 in the inductor 12 and the bridge converter 13 boosts the DC current output from the external charging port 2 and outputs a DC current to charge the external battery 3.

[0195] In addition, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit, or the external battery 3, the first phase bridge 131, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit.

[0196] Note that in this embodiment, the principles of the DC discharge operation mode and the DC charging operation mode are opposite. For the specific operation principle of the DC discharge operation mode, reference can be made to the specific operation process of the DC charging mode, and the description is omitted here.

[0197] Specifically, when implementing, a DC power supply or an AC power supply supplies a DC current or an AC current to the power system 9 through the external charging port 2, and the DC power supply may be a DC current after rectifying an external AC power supply, or may be a DC current output by an external charging stand, and no specific limitation is made here.

[0198] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 12, the external charging port 2 is an AC charging port 21, and the energy conversion device 8 further includes a first rectification module 17a.

[0199] Specifically, the first rectification module 17a is connected to the AC charging port 21, the first charging connection terminal 811, and the second charging connection terminal 812 respectively, that is, it is connected between the AC charging port 21 and the charging connection terminal group 81.

[0200] By controlling the on / off states of the switches in the switch module by the control module 54, the switching between the AC charging mode and the driving mode is realized. When switched to the AC charging mode, the control module 54 controls the AC charging circuit composed of the AC charging port 21, the first rectification module 17a, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3, or the AC charging circuit composed of the AC charging port 21, the first rectification module 17a, the inductor 12, the first phase bridge 131, and the external battery 3. When switched to the driving mode by the control module 54, the external battery 3, the bridge converter 13, and the external motor 4 constitute a driving circuit.

[0201] In other embodiments of the present application, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, the first rectification module 17a, and the AC charging port 21 constitute an AC discharge circuit. Alternatively, the external battery 3, the first phase bridge 131, the inductor 12, the first rectification module 17a, and the AC charging port 21 constitute an AC discharge circuit. In the above AC discharge circuit, by switching the power switch in the first rectification module 17a, a direct current is converted into an alternating current and discharged from the AC charging port 21.

[0202] In this embodiment, the first rectification module 17a rectifies the alternating current output from the AC charging port 21 into a direct current to charge the external battery 3, or the first rectification module 17a converts the direct current into an alternating current to discharge from the AC charging port 21.

[0203] In other embodiments of the present application, as one embodiment of the present application, as shown in FIG. 14, the external charging port 2 includes an AC charging port 21 and a DC charging port 22, and the energy conversion device 8 further includes a second rectification module 17b.

[0204] Specifically, the second rectification module 17b is connected to the AC charging port 21, the first charging connection terminal 811, and the second charging connection terminal 812 respectively, that is, it is connected between the AC charging port 21 and the charging connection terminal group 81, and the DC charging port 22 is connected to the first charging connection terminal 811 and the second charging connection terminal 812 respectively.

[0205] By controlling the on / off states of each switch in the switch module by the control module 54, the switching between the AC charging mode, the DC charging mode, and the driving mode is realized. When switching to the AC charging mode, the AC charging port 21, the second rectification module 17b, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 form an AC charging circuit. Alternatively, the AC charging port 21, the second rectification module 17b, the inductor 12, the first phase bridge 131, and the external battery 3 form an AC charging circuit.

[0206] In other embodiments of the present application, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, the second rectification module 17b, and the AC charging port 21 form an AC discharge circuit. Alternatively, the external battery 3, the first phase bridge 131, the inductor 12, the second rectification module 17b, and the AC charging port 21 form an AC discharge circuit. In the above AC discharge circuit, by switching the power switch in the second rectification module 17b, the DC current is converted into an AC current and discharged from the AC charging port 21.

[0207] When switching to the DC charging mode, the DC charging port 22, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 form a DC charging circuit. Alternatively, the DC charging port 22, the inductor 12, the first phase bridge of the bridge converter 13, and the external battery 3 form a DC charging circuit.

[0208] In other embodiments of the present application, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, and the DC charging port 22 form a DC discharge circuit. Alternatively, the external battery 3, the first phase bridge 131, the inductor 12, and the DC charging port 22 form a DC discharge circuit.

[0209] When switching to the driving mode, the external battery 3, the bridge converter 13, and the external motor 4 form a driving circuit.

[0210] In this embodiment, the second rectification module 17b rectifies the alternating current output from the AC charging port 21 into direct current to charge the external battery 3, or discharges from the AC charging port 21 by converting the direct current into alternating current by the second rectification module 17b.

[0211] In another embodiment of the present application, as one embodiment of the present application, as shown in FIG. 15, the energy conversion device 8 further includes a bidirectional bridge 18.

[0212] Specifically, the bidirectional bridge 18 is connected to the second charging connection end 812, the first bus end, and the second bus end respectively.

[0213] By controlling the on / off states of the switches in the switch module by the control module 54, the switching between the AC charging mode, the DC charging mode, and the driving mode is realized. When switched to the AC charging mode, the AC charging port 21, the inductor 12, the bridge converter 13, the bidirectional bridge, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute an AC charging circuit.

[0214] In another embodiment of the present application, the external battery 3, the first bidirectional H-bridge, the transformer unit 14, the bidirectional bridge 18, the bridge converter 13, the inductor 12, and the AC charging port 21 constitute an AC discharge circuit. In this AC discharge circuit, the bidirectional bridge 18 and the first phase bridge 131 cooperate to form a bidirectional H-bridge, and discharge from the AC charging port 21 by converting direct current into alternating current.

[0215] When switched to the DC charging mode, the DC charging port 21, the inductor 12, the bridge converter 13, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute a DC charging circuit, or the DC external charging port 2, the inductor 12, the first phase bridge, and the external battery 3 constitute a DC charging circuit.

[0216] In other embodiments of the present application, the external battery 3, the first bidirectional H-bridge 15, the transformer unit 14, the bridge converter 13, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit, or the external battery 3, the first phase bridge 131, the inductor 12, and the DC charging port 22 constitute a DC discharge circuit.

[0217] When switched to the driving mode, the external battery 3, the bridge converter 13, and the external motor 4 constitute a driving circuit.

[0218] In this embodiment, the AC charging port 21, the inductor 12, the bridge converter 13, the bidirectional bridge 18, the transformer unit 14, the first bidirectional H-bridge 15, and the external battery 3 constitute an AC charging circuit. In the energy conversion device 1, the bidirectional bridge 18 and the first phase bridge 131 in the bridge converter 13 cooperate to form a bidirectional H-bridge, convert the alternating current into direct current, and then utilize the second phase bridge 132 and the third phase bridge 133 in the bridge converter 13 to convert the direct current into alternating current. As a result, the transformer unit 14 receives a high-frequency alternating current and then rectifies it into a direct current by the first bidirectional H-bridge 15 to charge the external battery 3.

[0219] In other embodiments of the present application, as one embodiment of the present application, the on-vehicle charging module 91, the motor control module 92, and the bidirectional DC / DC module 93 are integrated in the first case 6. In other embodiments of the present application, the on-vehicle charging module 91, the motor control module 92, and the bidirectional DC / DC module 93 may be provided separately in two or three cases, and specific limitations are not imposed here.

[0220] In this embodiment, by integrating the on-vehicle charging module 91, the motor control module 92, and the bidirectional DC / DC module 93 in the first case 6, the overall structure of the power system 9 is made more compact, and further, the volume of the power system 9 is reduced, whereby the weight of the vehicle applying the power system 9 can be reduced.

[0221] In other embodiments of the present application, as one embodiment of the present application, the power system 9 further includes a speed reducer 56 coupled to the motor in a power transmissible manner, and the speed reducer 56 and the motor are integrated in the second case 7.

[0222] In other embodiments of the present application, as one embodiment of the present application, the first case 6 and the second case 7 are fixedly connected.

[0223] Specifically, when implementing, the first case 6 and the second case 7 may be connected by adopting any connecting member having a fixing effect, or the first case 6 is provided with a fixing member connectable to the second case 7, or the second case 7 is provided with a fixing member connectable to the first case 6, without specific limitations here.

[0224] In this embodiment, by fixing the first case 6 and the second case 7, the separation between the first case 6 and the second case 7 can be effectively prevented, thereby ensuring that the in-vehicle charging module 91, the motor control module 92, the bidirectional DC / DC module 93, the external motor 4 and the speed reducer 56 do not malfunction due to the dropping of the case, and improving the operation reliability and stability of the power system 9.

[0225] It should be noted that in this embodiment, for the specific operation process of the detailed operation principle of the energy conversion device 8, the control module 54 and the switch module in the power system 9, reference can be made to the detailed description of the energy conversion device 8 mentioned above, and the description is omitted here.

[0226] In other embodiments of the present application, the present application further provides a vehicle including the power system 5 or the power system 9 described in the above embodiment. For the specific operation principle of the power system 9 in the vehicle of the embodiment of the present application, reference can be made to the detailed description of the power system 5 or the power system 9 mentioned above, and the description is omitted here.

[0227] In this application, the vehicle according to this application adopts a power system 5 including an in-vehicle charging module 51, a motor control module 52, a bidirectional DC / DC module 53, and a control module 54, or adopts a power system 9 including an in-vehicle charging module 91, a motor control module 92, a bidirectional DC / DC module 93, and a control module 94. When applying the power system 5 or the power system 9, it operates in a drive mode, a DC charging mode, and an AC charging mode in a time-division manner, and further adopts the same circuit configuration to realize driving the motor of the vehicle and charging the battery. The circuit integration degree is high, and the circuit structure is simple. Thereby, the circuit cost is reduced, the circuit volume is decreased, and the problems that the overall structure of the conventional motor drive and charging system circuit is complex, the integration degree is low, the volume is large, and the cost is high are solved.

[0228] In addition, in the description of this application, the orientation or positional relationship indicated by terms such as "center", "longitudinal direction", "lateral direction", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial direction", "radial direction", "circumferential direction", etc. is based on the orientation or positional relationship shown in the drawings, and is only for facilitating the description and simplifying the description of this application, and does not indicate or imply that the indicated device or component must have a specific orientation and be configured and operate in a specific orientation. Therefore, it should not be understood that this limits this application.

[0229] Also, the terms "first" and "second" are only for explaining the purpose, and should not be understood as indicating or implying relative importance, or implicitly indicating the quantity of the indicated technical features. Thus, the features limited by "first" and "second" can explicitly or implicitly include one or more of such features. In the description of this application, "a plurality" means two or more unless there is a clear and specific limitation.

[0230] In this application, unless otherwise clearly defined or limited, terms such as "mounted", "connected", "joined", "fixed", etc. should be understood in a broad sense. For example, they may be fixed connections, detachable connections, integral connections, mechanical connections, electrical connections, direct connections, connections through an intermediate medium, or the relationship of communication between two elements or the interaction between two elements. A person skilled in the art can understand the specific meaning of the above terms in this application according to the specific situation.

[0231] In this application, unless otherwise clearly defined or limited, for the first feature to be "above" or "below" the second feature, it may include that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Also, for the first feature to be "above", "above or on the upper surface" of the second feature, it may mean that the first feature is directly above and obliquely above the second feature, or simply that the height of the first feature in the horizontal direction is higher than that of the second feature. For the first feature to be "below", "below or on the lower surface" of the second feature, it may mean that the first feature is directly below and obliquely below the second feature, or simply that the height of the first feature in the horizontal direction is lower than that of the second feature.

[0232] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, configurations, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example. Also, the specific features, structures, materials or characteristics described can be combined in a suitable form in any one or more embodiments or examples. Also, unless they are mutually contradictory, a person skilled in the art can combine or combine the different embodiments and examples described in this specification, and the features of different embodiments and examples.

[0233] The above has shown and described the embodiments of the present application. However, the above embodiments are exemplary and should not be understood as limiting the present application. A person skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. An inductor having one end connected to an external charging port, A bridge converter connected between an external battery and the external charging port and including a first-phase bridge, a second-phase bridge, and a third-phase bridge connected in parallel, wherein the other end of the inductor is connected to the first-phase bridge, A transformer unit having input ends respectively connected to the second-phase bridge and the third-phase bridge, and no converter is connected between the input ends and the second-phase bridge and the third-phase bridge, A first bidirectional H-bridge connected between the output end of the transformer unit and the external battery, The external battery is connected to an external motor via the bridge converter, and the external charging port is connected to the external battery via the inductor, the bridge converter, the transformer unit, and the first bidirectional H-bridge, The external battery drives the external motor by an energy conversion device, and the external charging port is externally connected to a power source and charges the external battery by an energy conversion device, The first-phase bridge includes a first power switch and a second power switch connected in series, and a first intermediate point between the first power switch and the second power switch is connected to the inductor, The second-phase bridge includes a third power switch and a fourth power switch connected in series, and a second intermediate point between the third power switch and the fourth power switch is connected to the transformer unit, The third-phase bridge includes a fifth power switch and a sixth power switch connected in series, and a third intermediate point between the fifth power switch and the sixth power switch is connected to the transformer unit, The first ends of the first power switch, the third power switch, and the fifth power switch are commonly connected to form a first bus end of the bridge converter, and the second ends of the second power switch, the fourth power switch, and the sixth power switch are commonly connected to form a second bus end of the bridge converter. The second bus end is connected to the external charging port, the first bus end is connected to one end of the external battery, and the second bus end is connected to the other end of the external battery, The external motor includes a motor coil, the first intermediate point is connected to the first phase coil of the motor coil, the second intermediate point is connected to the second phase coil of the motor coil, and the third intermediate point is connected to the third phase coil of the motor coil. The transformer unit A primary coil having one end connected to the second intermediate point and the other end connected to the third intermediate point, A first secondary coil connected to the first bidirectional H-bridge, A second secondary coil connected to a storage battery or an in-vehicle discharge port via a second bidirectional H-bridge, and an energy conversion device characterized by including the same.

2. The external battery, the bridge converter, and the external motor constitute a drive circuit for driving the external motor, and the external charging port, the inductor, the bridge converter, the transformer unit, and the first bidirectional H-bridge constitute a charging circuit for charging the external battery. The energy conversion device according to claim 1, characterized in that the drive circuit and the charging circuit multiplex the bridge converter.

3. The energy conversion device according to claim 1, further comprising a first capacitor connected between the first bus terminal and the second bus terminal.

4. The energy conversion device according to claim 1, characterized in that a first inductor is provided between the primary coil and the second intermediate point, and a second capacitor is provided between the primary coil and the third intermediate point.

5. The first bidirectional H-bridge A seventh phase bridge including a seventh power switch and an eighth power switch connected in series, and a seventh phase bridge in which a fourth intermediate point between the seventh power switch and the eighth power switch is connected to one end of the first secondary coil, An eighth phase bridge including a ninth power switch and a tenth power switch connected in series, and an eighth phase bridge in which a fifth intermediate point between the ninth power switch and the tenth power switch is connected to the other end of the first secondary coil, and includes The first end of the seventh power switch and the first end of the ninth power switch are commonly connected to form the third bus end of the first bidirectional H-bridge. The second end of the eighth power switch and the second end of the tenth power switch are commonly connected to form the fourth bus end of the first bidirectional H-bridge. The third bus end is connected to one end of the external battery, and the fourth bus end is connected to the other end of the external battery. The energy conversion device according to claim 1, characterized in that.

6. A second inductor is provided between the first secondary coil and the fourth intermediate point, and a third capacitor is provided between the first secondary coil and the fifth intermediate point. The energy conversion device according to claim 5, characterized in that.

7. The energy conversion device according to claim 5, further comprising a fourth capacitor connected between the third bus end and the fourth bus end.

8. The external charging port is an AC charging port, and the energy conversion device is further comprising a first rectification module connected to the AC charging port, the inductor, and the bridge converter respectively, The AC charging port, the first rectification module, the inductor, the bridge converter, the transformer unit, the first bidirectional H-bridge, and the external battery constitute an AC charging circuit or an AC discharge circuit. The energy conversion device according to claim 1, characterized in that.

9. The external charging port is an AC charging port and a DC charging port, and the energy conversion device is further comprising a second rectification module connected to the AC charging port, the inductor, and the bridge converter respectively. The DC charging port is connected to the inductor and the bridge converter respectively, The AC charging port, the second rectification module, the inductor, the bridge converter, the transformer unit, the first bidirectional H-bridge, and the external battery constitute an AC charging circuit or an AC discharge circuit, The DC charging port, the inductor, the bridge converter, the transformer unit, the first bidirectional H-bridge, and the external battery form a DC charging circuit or a DC discharging circuit, or the DC charging port, the inductor, the first phase bridge, and the external battery form a DC charging or DC discharging circuit. The energy conversion device according to claim 1 is characterized in that.

10. The external charging port is an AC charging port and a DC charging port, and the energy conversion device further includes a bidirectional bridge connected to the AC charging port and the bridge converter respectively, the DC charging port is connected to the inductor and the bridge converter respectively, the AC charging port, the inductor, the bridge converter, the bidirectional bridge, the transformer unit, the first bidirectional H-bridge, and the external battery form an AC charging circuit or an AC discharging circuit, The DC charging port, the inductor, the bridge converter, the transformer unit, the first bidirectional H-bridge, and the external battery form a DC charging circuit or a DC discharging circuit, or the DC charging port, the inductor, the first phase bridge, and the external battery form a DC charging circuit or a DC discharging circuit. The energy conversion device according to claim 1 is characterized in that.

11. The bidirectional bridge includes an eleventh power switch and a twelfth power switch connected in series, a sixth intermediate point between the eleventh power switch and the twelfth power switch is connected to the external charging port, a first end of the eleventh power switch is connected to a first bus end of the bridge converter, and a second end of the twelfth power switch is connected to a second bus end of the bridge converter. The energy conversion device according to claim 10 is characterized in that.

12. An energy conversion device according to any one of claims 1 to 11, and a power system including a control module, wherein the energy conversion device includes an in-vehicle charging module including an inductor connected to an external charging port, a motor control module including a bridge converter connected to the external charging port, the inductor, an external motor, and an external battery respectively, A bidirectional DC / DC module including a transformer unit and a first bidirectional H-bridge, wherein one end of the transformer unit is connected to the bridge converter, the other end of the transformer unit is connected to one end of the first bidirectional H-bridge, and the other end of the first bidirectional H-bridge is connected to the external battery. The external battery is connected to the motor via the bridge converter, and the external charging port is connected to the external battery via the inductor, the bridge converter, the transformer unit, and the first bidirectional H-bridge. The control module drives the external motor by controlling the energy conversion device. When the external charging port is externally connected to a power source, the control module further charges the external battery by controlling the energy conversion device. A power system characterized by this.

13. The power system according to claim 12, further comprising a speed reducer coupled to the external motor in a power-transmissible manner and integrated with the external motor in a second case.

14. A vehicle, characterized by including the power system according to claim 12 or 13.

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