CN112389209B

CN112389209B - Energy conversion device and vehicle

Info

Publication number: CN112389209B
Application number: CN201910755469.9A
Authority: CN
Inventors: 李吉成; 郑益浩; 牟利; 张宇昕; 金雪虎
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2022-03-18
Anticipated expiration: 2039-08-15
Also published as: CN112389209A

Abstract

The application provides an energy conversion device and a vehicle, the energy conversion device comprises a reversible PWM rectifier, a motor coil and a power switch module, the motor coil comprises a first winding unit and a second winding unit, an external battery, the reversible PWM rectifier and the motor coil form a driving loop, an external direct current port and the external battery form a direct current charging circuit or a direct current discharging circuit through the energy conversion device, the motor is driven by the driving circuit to output power, the direct current discharging circuit or the direct current charging circuit discharges or receives and charges the power, the driving circuit, the direct current charging circuit and the direct current discharging circuit all adopt motor coils, the direct current charging circuit and the direct current discharging circuit all adopt power switch modules, therefore, the circuit structure is simplified, the integration level is improved, and the purposes of volume reduction and cost reduction are achieved.

Description

Energy conversion device and vehicle

Technical Field

The application relates to the technical field of vehicles, in particular to an energy conversion device and a vehicle.

Background

With the continuous popularization of electric vehicles, more and more electric vehicles enter the society and families, great convenience is brought to people going out, relevant subsidy policies built for charging stations in various regions are planned and even come out, and the quantity and distribution range of charging infrastructure are greatly improved. However, due to the limitation of the driving range of the pure electric vehicle, the vehicle user is very concerned about the problem that the vehicle is anchored due to the exhaustion of the power supply. Although many vehicle manufacturing enterprises remind the vehicle driver of the information of the remaining battery capacity and the warning information of the low battery capacity through a vehicle meter or other methods, the situation that the remaining battery capacity of the vehicle cannot meet the requirement of driving the vehicle to a charging facility position or the situation that the vehicle is exhausted by the driver unconsciously can occur inevitably.

In order to avoid the problem that the experience of a vehicle user on the use of the pure electric vehicle is influenced, and even the use and popularization of the pure electric vehicle are influenced, it is necessary to develop a technology for charging the vehicle by using the mobile power supply equipment, and the requirement that the vehicle supplements electric energy to the vehicle under the condition that the electric quantity is exhausted or the electric quantity is low until the vehicle energy storage device does not output any more is met.

Disclosure of Invention

An object of the present application is to provide an energy conversion device and a vehicle, which can discharge power consumption equipment and receive charging of power supply equipment.

The present application is achieved in that in a first aspect there is provided an energy conversion device comprising a reversible PWM rectifier, a motor coil and a power switch module, the power switching module includes a first bidirectional leg and a second bidirectional leg, the reversible PWM rectifier, the first bidirectional leg, and the second bidirectional leg are connected in parallel, part of the coil branches or all the coil branches of the motor coil at least form a first winding unit and a second winding unit, the reversible PWM rectifier further connects the first winding unit and the second winding unit, the first winding unit is also led out of a first neutral wire and a second neutral wire, the second winding unit is also led out of a third neutral wire and a fourth neutral wire, a second neutral line of the first winding unit is connected with the first bidirectional bridge arm, and a fourth neutral line of the second winding unit is connected with the second bidirectional bridge arm;

an external direct current port forms a direct current charging circuit or a direct current discharging circuit with an external battery through the energy conversion device, and the external battery forms a driving loop with the reversible PWM rectifier and the motor coil in the energy conversion device; the first neutral line of the first winding unit, the fourth neutral line of the second winding unit, the first bidirectional bridge arm, the second bidirectional bridge arm and the reversible PWM rectifier are respectively connected with an external direct current port, and the reversible PWM rectifier, the first bidirectional bridge arm and the second bidirectional bridge arm are respectively connected with an external battery.

A second aspect of the present application provides a vehicle further including the energy conversion apparatus provided in the first aspect.

The application provides an energy conversion device and a vehicle, wherein the energy conversion device comprises a reversible PWM rectifier, a first winding unit, a second winding unit and a power switch module, so that the energy conversion device works in a driving mode, a heating mode, a charging mode and a discharging mode, when the energy conversion device works in the driving mode, an external battery, the reversible PWM rectifier, the first winding unit and the second winding unit form a driving loop or a heating loop, when the energy conversion device works in the charging mode, an external direct current port and the external battery form a direct current charging circuit through the energy conversion device, when the energy conversion device works in the discharging mode, the external direct current port and the external battery form a direct current discharging circuit through the energy conversion device, the motor is driven to output power through the driving loop, and the external discharging or receiving charging is carried out through the direct current discharging circuit or the direct current charging circuit, the charging of receiving direct current power supply equipment when the external battery electric quantity is insufficient is realized, the discharging is carried out on the direct current power utilization equipment when the external battery electric quantity is sufficient, the reversible PWM rectifier and the motor are respectively adopted in the driving loop, the direct current charging loop and the direct current discharging loop, and the power switch modules are respectively adopted in the direct current charging loop and the direct current discharging loop, so that the circuit structure is simplified, the integration level is improved, and the purposes of volume reduction and cost reduction are achieved, the problems of complex structure, low integration level, large volume and high cost of the existing overall control circuit comprising the battery charging circuit and the motor driving circuit are solved, in addition, a multi-phase coil branch is arranged in each phase coil in the motor coil, and a part of coil branches or all the coil branches in the multi-phase coil respectively form a first winding unit and a second winding unit, through the series connection method of the motor stator windings, the first winding unit and the second winding unit are connected in series in the direct-current charging and discharging circuit, and the first winding unit and the second winding unit are connected in series in the alternating-current charging and discharging circuit, so that the inductance in use is increased, the inductance of the motor windings can be fully utilized, the equivalent series inductance of the motor is increased, the functions of the motor are expanded, the existing functional devices are reduced, the cost of the whole vehicle is reduced, the cost is low, and the compatibility is good.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic structural diagram of an energy conversion device according to an embodiment of the present disclosure;

fig. 2 is another schematic structural diagram of an energy conversion device according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of an electric motor in an energy conversion device according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an electric motor in an energy conversion device according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of an electric motor in an energy conversion device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of an electric motor in an energy conversion device according to an embodiment of the present application;

fig. 7 is a circuit diagram of an energy conversion device according to an embodiment of the present application;

fig. 8 is another circuit diagram of an energy conversion device according to an embodiment of the present application;

fig. 9 is another circuit diagram of an energy conversion device according to an embodiment of the present application;

fig. 10 is another circuit diagram of an energy conversion device according to an embodiment of the present application;

fig. 11 is a schematic current flow diagram of an energy conversion device according to an embodiment of the present application;

fig. 12 is a schematic current flow diagram of an energy conversion device according to an embodiment of the present application;

fig. 13 is a schematic current flow diagram of an energy conversion device according to an embodiment of the present application;

fig. 14 is a schematic current flow diagram of an energy conversion device according to an embodiment of the present application;

fig. 15 is a schematic current flow diagram of an energy conversion device according to an embodiment of the present application;

fig. 16 is a schematic current flow diagram of an energy conversion device according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of an energy conversion device according to a second embodiment of the present application;

fig. 18 is a circuit diagram of an energy conversion device according to a second embodiment of the present application;

fig. 19 is another circuit diagram of an energy conversion device according to the second embodiment of the present application;

fig. 20 is a schematic structural diagram of an energy conversion device according to a third embodiment of the present application;

fig. 21 is a schematic structural diagram of an energy conversion device according to a fourth embodiment of the present application;

fig. 22 is a schematic structural diagram of a vehicle according to a fifth embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

In order to explain the technical means of the present application, the following description will be given by way of specific examples.

In one embodiment, an energy conversion device is provided, as shown in fig. 1, and includes a reversible PWM rectifier 102, a motor coil 103, and a power switch module 104, where the power switch module 104 includes a first bidirectional leg 141 and a second bidirectional leg 142, the reversible PWM rectifier 102, the first bidirectional leg 141, and the second bidirectional leg 142 are connected in parallel, a part of or all of the coil legs of the motor coil 103 at least constitute the first winding unit 131 and the second winding unit 132, the reversible PWM rectifier 102 is further connected to the first winding unit 131 and the second winding unit 132, the first winding unit 131 further leads out a first neutral line and a second neutral line, the second winding unit 132 further leads out a third neutral line and a fourth neutral line, the second neutral line of the first winding unit 131 is connected to the first bidirectional arm 141, and the fourth neutral line of the second winding unit 132 is connected to the second bidirectional arm 142;

an external direct current port 106 and an external battery 101 form a direct current charging circuit or a direct current discharging circuit through an energy conversion device, and the external battery 101 and a reversible PWM rectifier 102 and a motor coil 103 in the energy conversion device form a driving loop; the first neutral line of the first winding unit 131, the fourth neutral line of the second winding unit 132, the first bidirectional arm 141, the second bidirectional arm 142, and the reversible PWM rectifier 102 are connected to the external dc port 106, and the reversible PWM rectifier 102, the first bidirectional arm 141, and the second bidirectional arm 142 are connected to the external battery 101.

The reversible PWM rectifier 102 comprises a multi-phase bridge arm, the number of the bridge arms is configured according to the number of phases of the motor coil 103, each phase of inverter bridge arm comprises two power switch units, the power switch units can be of the types of devices such as transistors, IGBTs, MOSFET tubes and SiC tubes, the connection point of the two power switch units in the bridge arm is connected with one phase of coil in the motor, and the power switch units in the reversible PWM rectifier 102 can be switched on and off according to an external control signal; the power switch module 104 includes a first bidirectional bridge arm 141 and a second bidirectional bridge arm 142, each bidirectional bridge arm includes at least two power switch units, and the power switch module 104 can realize conduction of different loops in the energy conversion device according to the control signal; the external dc port 106 is used to connect a dc power supply device or a dc power device, and may receive a current output by the dc power supply device or output a current to the dc power device, and the external battery 101 may be a battery in the vehicle, such as a power battery.

Wherein part of the coil branches or all of the coil branches of motor coil 103 at least form a first winding unit 131 and a second winding unit 132, first winding unit 131 includes at least two phase endpoints and at least two neutral points, and wherein the two neutral points lead out a first neutral line and a second neutral line, respectively, second winding unit 132 includes at least two phase endpoints and at least two neutral points, and wherein the two neutral points lead out a third neutral line and a fourth neutral line, respectively, first winding unit 131 and second winding unit 132 have different phase endpoints, and first winding unit 131 and second winding unit 132 are both connected to reversible PWM rectifier 102 through phase endpoints, first winding unit 131 is connected to external dc port 106 through the first neutral line, first winding unit 131 is connected to first bidirectional bridge arm 141 through the second neutral line, second winding unit 132 is connected to external dc port 106 through the third neutral line, second winding section 132 is connected to second bidirectional arm 142 via a fourth neutral line, and it can be seen that first winding section 131 and second winding section 132 are connected to reversible PWM rectifier 102, respectively, and that when reversible PWM rectifier 102 is in an off state, when a current input from external dc port 106 flows through first winding section 131, flows from the first neutral line, and flows out from the second neutral line, coils connected in common to form a first neutral point and coils connected in common to form a second neutral point are connected in series, and similarly, a current input from external dc port 106 flows through second winding section 132, flows from the third neutral line, flows out from the fourth neutral line, and coils connected in common to form a third neutral point and coils connected in common to form a fourth neutral point are connected in series.

The energy conversion device further comprises a control module, the control module is respectively connected with the reversible PWM rectifier 102 and the power switch module 104 and sends control signals to the reversible PWM rectifier 102 and the power switch module 104, the control module CAN comprise a vehicle control unit, a control circuit of the reversible PWM rectifier 102 and a BMS battery manager circuit, the vehicle control unit, the reversible PWM rectifier 102 and the BMS battery manager circuit are connected through CAN lines, and different modules in the control module control the power switch module 104 and the power switch in the reversible PWM rectifier 102 to be switched on and off according to the acquired information so as to realize the conduction of different current loops.

The energy conversion device can work in a driving mode, a heating mode, a direct current charging mode and a direct current discharging mode:

when the energy conversion device works in a driving mode, the external battery 101, the reversible PWM rectifier 102 and the first winding unit 131 form a first driving loop, the external battery 101, the reversible PWM rectifier 102 and the second winding unit 132 form a second driving loop, the external battery 101, the reversible PWM rectifier 102, the first winding unit 131 and the second winding unit 132 form a third driving loop, the external battery 101 supplies direct current to the reversible PWM rectifier 102, the reversible PWM rectifier 102 inverts the direct current into three-phase alternating current, and the three-phase alternating current is input to the motor coil 103 to drive the motor to run.

When the energy conversion device works in a heating mode, the external battery 101, the reversible PWM rectifier 102 and the first winding unit 131 form a first heating loop, the external battery 101, the reversible PWM rectifier 102 and the second winding unit 132 form a second heating loop, the external battery 101, the reversible PWM rectifier 102, the first winding unit 131 and the second winding unit 132 form a third heating loop, the external battery 101 supplies direct current to the reversible PWM rectifier 102, and the reversible PWM rectifier 102 inverts the direct current into three-phase alternating current and inputs the three-phase alternating current into the motor coil 103 to drive the motor to run.

When the energy conversion device works in a direct current charging mode, the external direct current port 106, the energy conversion device and the external battery 101 form a direct current charging circuit, the external direct current port 106 is connected with direct current power supply equipment and provides direct current power for the direct current charging circuit, when the energy conversion device works in a direct current discharging mode, the external direct current port 106, the energy conversion device and the external battery 101 form a direct current discharging circuit, the external direct current port 106 is connected with direct current electric equipment, and the direct current discharging circuit provides direct current power for the direct current electric equipment.

The technical effect of the energy conversion device in the embodiment of the application is as follows: by adopting the energy conversion device comprising the reversible PWM rectifier 102, the first winding unit 131, the second winding unit 132 and the power switch module 104, the energy conversion device is enabled to work in a driving mode, a charging mode and a discharging mode, when the energy conversion device works in the driving mode, the external battery 101, the reversible PWM rectifier 102, the first winding unit 131 and the second winding unit 132 form a driving loop, when the energy conversion device works in the charging mode, the external direct current port 106 forms a direct current charging circuit with the external battery 101 through the energy conversion device, when the energy conversion device works in the discharging mode, the external direct current port 106 forms a direct current discharging circuit with the external battery 101 through the energy conversion device, the motor outputs power through the driving loop, the external discharging or receiving charging is carried out through the direct current discharging circuit or the direct current charging circuit, and the charging of the direct current power supply equipment is received when the external battery 101 is in insufficient electricity, and when the external battery 101 has sufficient electric quantity, discharging to the direct current electric equipment, and the driving loop, the direct current charging loop and the direct current discharging loop all adopt motor coils, thereby simplifying the circuit structure, improving the integration level, further achieving the purposes of volume reduction and cost reduction, solving the problems of complex structure, low integration level, large volume and high cost of the existing overall control circuit comprising the battery charging circuit and the motor driving circuit, in addition, a multiphase coil branch is arranged in each phase coil in the motor coil 103, and partial coil branches or all coil branches in the multiphase coil respectively form a first winding unit 131 and a second winding unit 132, through a motor stator winding series connection method, coils in the first winding unit 131 and the second winding unit 132 are connected in series in the direct current charging and discharging circuit, and the first winding unit 131 and the second winding unit 132 are connected in series in the alternating current charging and discharging circuit, the windings in the first winding unit 131 and the windings in the second winding unit 132 in the motor coil 103 are connected in series for use, the achieved inductance is the sum of the inductances of the first winding unit 131 and the second winding unit 132, the equivalent inductance when the motor coil is used is further increased, the charging and discharging current ripple is small, the loss is small, and the external radiation is small; the current of each phase winding of the motor is basically consistent and in the same phase, the synthesized magnetic field intensity generated by the first winding unit 131 is basically zero, the synthesized magnetic field intensity generated by the second winding unit 132 is basically zero, the synthesized magnetic field intensity generated by all windings of the motor is basically zero, the rotor of the motor has no risk of demagnetization, the motor has no torque output, the synthesized magnetic field intensity is basically zero, the iron loss of the motor is greatly reduced, and the efficiency during charging and discharging is improved; for direct current charging and discharging, two sets of windings are respectively connected in series to increase charging current, meanwhile, phase-staggered control can be adopted between the bridge arms connected with the two sets of windings, the equivalent inductance of the motor windings is further increased, charging and discharging current ripples are reduced, the inductance of the motor windings can be fully utilized, the equivalent series inductance of the motor is increased, the functions of the motor are expanded, existing functional devices are reduced, the cost of the whole vehicle is reduced, the cost is low, and the compatibility is good.

It should be noted that the lead wires of the motor winding and the power switch module 104 can also be integrated on the motor housing, so that the occurrence of the motor is reduced, the structure is simple, and the module can be cooled by the motor.

The circuit structure formed by the energy conversion device and the external battery 101, the power supply equipment or the electric equipment comprises the following embodiments:

in the first embodiment, the external dc port 106 forms a first dc charging circuit or a first dc discharging circuit with the external battery 101 via the first winding unit 131 and the first bidirectional arm 141 in the energy conversion device;

the external dc port 106 forms a second dc charging circuit or a second dc discharging circuit with the external battery 101 through the second winding unit 132 and the second bidirectional arm 142 in the energy conversion device.

In the dc charging mode, the external dc port 106 and the external battery 101 form a first dc charging circuit through the first winding unit 131 and the first bidirectional arm 141, the external dc port 106 is connected to the dc power supply device, the first winding unit 131 and the first bidirectional arm 141 form a first dc charging energy storage loop, the dc power supply device, the first winding unit 131, the first bidirectional arm 141 and the battery 101 form a first dc charging energy storage release loop, the dc charging circuit includes a first dc charging energy storage loop and a first dc charging energy storage release loop, during the operation of the first dc charging energy storage loop, the dc power supply device stores the electric energy in the first winding unit 131 by outputting the electric energy to the first dc charging energy storage loop, during the operation of the first dc charging energy storage release loop, the dc power supply device, The first winding unit 131 charges the external battery 101 through the first dc charging energy storage and release circuit, so that the process that the dc power supply device charges the external battery 101 through the first dc charging circuit is realized.

In the dc charging mode, the external dc port 106 and the external battery 101 form a second dc charging circuit through the second winding unit 132 and the second bidirectional bridge arm 142, the external dc port 106 is connected to the dc power supply device, the second winding unit 132 and the second bidirectional bridge arm 142 form a second dc charging energy storage loop, the dc power supply device, the second winding unit 132, the second bidirectional bridge arm 142 and the battery 101 form a second dc charging energy storage release loop, the dc charging circuit includes a second dc charging energy storage loop and a second dc charging energy storage release loop, during the operation of the second dc charging energy storage loop, the dc power supply device stores the electric energy in the second winding unit 132 by outputting the electric energy to the second dc charging energy storage loop, during the operation of the second dc charging energy storage release loop, the dc power supply device, The second winding unit 132 charges the external battery 101 through the second dc charging energy storage and release circuit, so that the process that the dc power supply device charges the external battery 101 through the second dc charging circuit is realized.

In the direct current discharge mode, the external battery 101, the first bidirectional arm 141, the first winding unit 131 and the external direct current port 106 form a first direct current discharge circuit, in the discharge mode, the external direct current port 106 is connected with a direct current electric device, the external battery 101 provides a direct current power supply for the direct current electric device through the direct current discharge circuit, the external battery 101, the first bidirectional arm 141, the first winding unit 131 and the direct current electric device form a first direct current discharge energy storage loop, the first bidirectional arm 141, the first winding unit 131 and the direct current electric device form a first direct current discharge energy storage and release loop, the first direct current discharge circuit comprises a first direct current discharge energy storage and release loop, in the working process of the first direct current discharge energy storage loop, the external battery 101 stores electric energy in the first winding unit 131 by outputting the electric energy to the first direct current discharge energy storage and release loop, in the working process of the first dc discharging energy storing and releasing circuit, the first winding unit 131 discharges for the dc power consuming device through the first dc discharging energy storing and releasing circuit, so that the process that the external battery 101 discharges for the dc power consuming device through the first dc discharging circuit is realized.

In the direct-current discharging mode, the external battery 101, the second bidirectional arm 142, the second winding unit 132 and the external direct-current port 106 form a second direct-current discharging circuit, in the discharging mode, the external direct-current port 106 is connected with the direct-current electric equipment, the external battery 101 provides direct-current power for the direct-current electric equipment through the second direct-current discharging circuit, the external battery 101, the second bidirectional arm 142, the second winding unit 132 and the direct-current electric equipment form a second direct-current discharging energy storage loop, the second bidirectional arm 142, the second winding unit 132 and the direct-current electric equipment form a second direct-current discharging energy storage and release loop, the second direct-current discharging circuit comprises a second direct-current discharging energy storage and release loop, and in the working process of the second direct-current discharging energy storage loop, the external battery 101 outputs electric energy to the second direct-current discharging energy storage loop and stores the electric energy in the second winding unit 132, in the working process of the second dc discharging energy storage and release circuit, the second winding unit 132 discharges the dc power device through the second dc discharging energy storage and release circuit, so that the process that the external battery 101 discharges the dc power device through the second dc discharging circuit is realized.

The first embodiment of the application has the technical effects that: the external dc port 106, the first winding unit 131, the second winding unit 132, the power switch module 104 and the external battery 101 form a charging circuit or a discharging circuit, so that the energy conversion device operates in a driving mode, a heating mode, a charging mode and a discharging mode in a time-sharing manner, when operating in the driving mode, the external battery 101, the reversible PWM rectifier 102, the first winding unit 131 and the second winding unit 132 form a driving loop, when operating in the charging mode, the external dc port 106, the first winding unit 131, the power switch module 104 and the external battery 101 form a first dc charging circuit, the external dc port 106, the second winding unit 132, the power switch module 104 and the external battery 101 form a second dc charging circuit, and when operating in the discharging mode, the external battery 101, the power switch module 104, the first winding unit 131, the power switch module 104, the external battery 101, the reversible PWM rectifier 102, the first winding unit 131 and the second winding unit 132 form a second dc charging circuit, The external direct current port 106 forms a first direct current discharging circuit, the external battery 101, the power switch module 104, the second winding unit 132 and the external direct current port 106 form a second direct current discharging circuit, the motor output power is driven through the driving circuit, the direct current power supply equipment is received and charged through the first direct current discharging circuit, the second direct current discharging circuit, the first direct current charging circuit and the second direct current charging circuit respectively, the charging of the direct current power supply equipment is received when the external battery 101 is insufficient in electric quantity, the discharging of the direct current power equipment is performed when the external battery 101 is sufficient in electric quantity, the first winding unit 131 and the second winding unit 132 are adopted in the driving circuit, the direct current charging circuit and the direct current discharging circuit, the power switch modules are adopted in the direct current charging circuit and the direct current discharging circuit, the circuit structure is simplified, and the integration level is improved, therefore, the purposes of volume reduction and cost reduction are achieved, and the problems of complex structure, low integration level, large volume and high cost of the existing control circuit are solved.

As a second embodiment, when the dc power supply equipment is connected to the external dc port 106, the dc power supply equipment forms a first dc charging circuit with the external battery 101 through the first winding unit 131 and the first bidirectional arm 141 in the energy conversion device; the dc power supply device forms a second dc charging circuit with the external battery 101 through the second winding unit 132 and the second bidirectional bridge arm 142 in the energy conversion device; the dc power supply device forms a third dc charging circuit with the external battery 101 through the first winding unit 131, the reversible PWM rectifier 102 and the energy conversion device; the direct current power supply equipment forms a fourth direct current charging circuit with the external battery 101 through the second winding unit 132, the reversible PWM rectifier 102 and the energy conversion device; the energy conversion device selects any one of the first direct current charging circuit, the second direct current charging circuit, the third direct current charging circuit and the fourth direct current charging circuit to work according to an external control signal; or, the energy conversion device selects any one of the first dc charging circuit and the second dc charging circuit, the first dc charging circuit and the fourth dc charging circuit, the second dc charging circuit and the third dc charging circuit, and the third dc charging circuit and the fourth dc charging circuit to operate simultaneously according to the external control signal, and the control of the bridge arm may adopt in-phase or out-of-phase control, for example: the module bridge arm between the first direct current charging circuit and the second direct current charging circuit can be staggered by 180 degrees for charging control, so that the equivalent inductance of the motor in use is further increased, and the charging and discharging current has small ripple, low loss and small external radiation.

The working process of the first dc charging circuit formed by the dc power supply device, the first winding unit 131, the first bidirectional bridge arm 141 and the external battery 101 and the working process of the second dc charging circuit formed by the dc power supply device, the second winding unit 132, the second bidirectional bridge arm 142 and the external battery 101 are please refer to the first embodiment, and are not described herein again.

In the dc charging mode, the dc power supply device, the first winding unit 131, the reversible PWM rectifier 102 and the external battery 101 form a third dc charging circuit, the dc power supply device, the first winding unit 131 and the reversible PWM rectifier 102 form a third dc charging energy storage loop, the dc power supply device, the first winding unit 131, the reversible PWM rectifier 102 and the external battery 101 form a third dc charging energy storage and release loop, the third dc charging circuit includes a third dc charging energy storage loop and a third dc charging energy storage and release loop, during the operation of the third dc energy storage loop, the dc power supply device outputs electric energy to the third dc energy storage loop to store the electric energy in the first winding unit 131, during the operation of the third dc charging energy storage and release loop, the dc power supply device and the first winding unit 131 charge the external battery 101 through the third dc charging energy storage and release loop together, the process that the direct current power supply equipment charges the external battery 101 through the third direct current charging circuit is realized.

In the dc charging mode, the dc power supply device, the second winding unit 132, the reversible PWM rectifier 102 and the external battery 101 form a fourth dc charging circuit, the dc power supply device, the second winding unit 132 and the reversible PWM rectifier 102 form a fourth dc charging energy storage loop, the dc power supply device, the second winding unit 132, the reversible PWM rectifier 102 and the external battery 101 form a fourth dc energy storage and release loop, the third dc charging circuit includes a fourth dc charging energy storage loop and a fourth dc energy storage and release loop, during the operation of the fourth dc energy storage loop, the dc power supply device outputs electric energy to the fourth dc energy storage loop to store the electric energy in the second winding unit 132, during the operation of the fourth dc energy storage and release loop, the dc power supply device and the second winding unit 132 charge the external battery 101 through the fourth dc energy storage and release loop together, the process that the direct current power supply device charges the external battery 101 through the fourth direct current charging circuit is realized.

Wherein, the energy conversion device selects any one of the first DC charging circuit, the second DC charging circuit, the third DC charging circuit and the fourth DC charging circuit to work according to the external control signal, which means that the energy conversion device realizes the single selection of one DC charging circuit to work by controlling the power switch module 104 and the reversible PWM rectifier 102 according to the external control signal, the energy conversion device can also select two DC charging circuits to work simultaneously according to the external control signal, when the power switch module 104 is controlled to be in the working state and the reversible PWM rectifier 102 is controlled to be in the non-working state, the selection of the first DC charging circuit and/or the second DC charging circuit to work is realized, when the power switch module 104 is controlled to be in the non-working state and the reversible PWM rectifier 102 is controlled to be in the working state, the selection of the third DC charging circuit and/or the fourth DC charging circuit to work is realized, when the power switch module 104 and the reversible PWM rectifier 102 are controlled to be in the working state, the first dc charging circuit and the fourth dc charging circuit are selected to work, and when the power switch module 104 and the reversible PWM rectifier 102 are controlled to be in the working state, the second dc charging circuit and the third dc charging circuit are selected to work.

The second embodiment of the application has the technical effects that: when an external charging port is connected with a direct current power supply device, the direct current power supply device forms a first direct current charging circuit with the external battery 101 through a first winding unit 131 and a power switch module 104 in the energy conversion device; the dc power supply device forms a second dc charging circuit with the external battery 101 through the second winding unit 132 and the power switch module 104 in the energy conversion device; the dc power supply device forms a third dc charging circuit with the external battery 101 through the first winding unit 131, the reversible PWM rectifier 102 and the energy conversion device; the direct current power supply equipment forms a fourth direct current charging circuit with the external battery 101 through the second winding unit 132, the reversible PWM rectifier 102 and the energy conversion device; the direct current charging circuit or the two direct current charging circuits can be selected to work simultaneously according to different requirements, wherein the first direct current charging circuit and the third direct current charging circuit cannot work simultaneously, the second direct current charging circuit and the fourth direct current charging circuit cannot work simultaneously, especially when the two direct current charging circuits work simultaneously, the charging current of the direct current charging equipment can be increased, and the control of the bridge arm can adopt the same phase or wrong phase control, for example: the module bridge arm between the first direct current charging circuit and the second direct current charging circuit can be staggered by 180 degrees for charging control, so that the equivalent inductance of the motor in use is further increased, the charging and discharging current ripple is small, the loss is small, the external radiation is small, the charging efficiency is high, and the battery 101 can be rapidly charged.

Further, in the second embodiment, the energy conversion device controls any one of the first dc charging circuit and the second dc charging circuit, the first dc charging circuit and the fourth dc charging circuit, the second dc charging circuit and the third dc charging circuit, and the third dc charging circuit and the fourth dc charging circuit to operate simultaneously according to the phase error of the external control signal.

Wherein, the energy conversion device controls the first DC charging circuit and the second DC charging circuit according to the phase error of the external control signal, which means that two groups of conducting signals with different phases are output to the power switch module 104 in the first DC charging circuit and the second DC charging circuit, so that the first DC charging circuit and the second DC charging circuit are in different conducting states, for example, the power switch module 104 is controlled to make the second DC charging circuit in the charging stage when the first DC charging circuit is in the charging energy storage stage, and to make the second DC charging circuit in the charging energy storage stage when the first DC charging circuit is in the charging energy storage stage, and similarly, when the first DC charging circuit and the fourth DC charging circuit, and the second DC charging circuit and the third DC charging circuit are simultaneously operated, the two charging circuits are also in different working stages, the wrong phase control of two charging circuits working simultaneously is realized.

In this embodiment, through establishing ties two sets of windings of motor respectively between power switch module 104 and direct current mouth 106 electric capacity to equivalent inductance when increasing the motor and using, two direct current charging circuit of simultaneous working can also can mistake phase control by same phase control, and wherein mistake phase control can further increase the inductance of motor winding equivalent inductance, reach equivalent inductance when further having increased the motor and using, and the charging and discharging current ripple is little, and the loss is little, and external radiation is little.

As a third embodiment, when a dc power device is connected to the external dc port 106, the external battery 101 forms a first dc discharge circuit with the dc power device via the first bidirectional arm 141 and the first winding unit 131 in the energy conversion device; the external battery 101 forms a second dc discharge circuit with the dc consumer through the second bidirectional arm 142, the second winding unit 132, and the energy conversion device; the external battery 101 forms a third dc discharge circuit through the reversible PWM rectifier 102, the first winding unit 131 and the dc power consuming device in the energy conversion device; the external battery 101 forms a fourth direct current discharge circuit through the reversible PWM rectifier 102, the second winding unit 132 and the direct current electric equipment in the energy conversion device; the energy conversion device selects any one of the first direct current discharge circuit, the second direct current discharge circuit, the third direct current discharge circuit and the fourth direct current discharge circuit to work according to an external control signal; or the energy conversion device selects any one group of the first direct current discharge circuit and the second direct current discharge circuit, the first direct current discharge circuit and the fourth direct current discharge circuit, the second direct current discharge circuit and the third direct current discharge circuit, and the third direct current discharge circuit and the fourth direct current discharge circuit to work simultaneously according to the external control signal.

For the working process of the first discharging circuit formed by the external battery 101, the power switch module 104, the first winding unit 131 and the dc power consuming device, and the second discharging circuit formed by the power switch module 104, the second winding unit 132 and the dc power consuming device, please refer to the first embodiment, which is not described herein again.

In the dc discharge mode, the external battery 101, the reversible PWM rectifier 102, the first winding unit 131, and the dc power device form a third dc discharge circuit, the external battery 101, the reversible PWM rectifier 102, the first winding unit 131, and the dc power device form a third dc energy storage loop, the reversible PWM rectifier 102, the first winding unit 131, and the dc power device form a third dc energy storage and release loop, the third dc discharge circuit includes a third dc energy storage loop and a third dc energy storage and release loop, during the operation of the third dc energy storage loop, the external battery 101 outputs electric energy to the third dc energy storage loop to store the electric energy in the first winding unit 131 and discharge the dc power device at the same time, during the operation of the third dc energy storage and release loop, the first winding unit 131 discharges the dc power device through the third dc energy storage and release loop, the process that the external battery 101 discharges the direct-current electric equipment through the third direct-current discharge circuit is realized.

In the dc discharge mode, the external battery 101, the reversible PWM rectifier 102, the second winding unit 132, and the dc power device form a fourth dc discharge circuit, the external battery 101, the reversible PWM rectifier 102, the second winding unit 132, and the dc power device form a fourth dc energy storage loop, the reversible PWM rectifier 102, the second winding unit 132, and the dc power device form a fourth dc energy storage release loop, the fourth dc discharge circuit includes a fourth dc energy storage loop and a fourth dc energy storage release loop, during the operation of the fourth dc energy storage loop, the external battery 101 outputs electric energy to the fourth dc energy storage loop to store the electric energy in the second winding unit 132 and discharge the dc power device, during the operation of the fourth dc energy storage release loop, the second winding unit 132 discharges the dc power device through the fourth dc energy storage release loop, the process that the external battery 101 discharges the direct-current electric equipment through the fourth direct-current discharge circuit is realized.

Wherein, the energy conversion device selects any one of the first DC discharge circuit, the second DC discharge circuit, the third DC discharge circuit and the fourth DC discharge circuit to work according to the external control signal, which means that the energy conversion device realizes the independent selection of one DC discharge circuit to work by controlling the power switch module 104 and the reversible PWM rectifier 102 according to the external control signal, the energy conversion device can also select two DC discharge circuits to work simultaneously according to the external control signal, when the power switch module 104 is controlled to be in the working state and the reversible PWM rectifier 102 is controlled to be in the non-working state, the selection of the first DC discharge circuit and/or the second DC discharge circuit to work is realized, when the power switch module 104 is controlled to be in the non-working state and the reversible PWM rectifier 102 is controlled to be in the working state, the selection of the third DC discharge circuit and/or the fourth DC discharge circuit to work is realized, when the power switch module 104 and the reversible PWM rectifier 102 are controlled to be in the working state, the first dc discharge circuit and the fourth dc discharge circuit are selected to work, and when the power switch module 104 and the reversible PWM rectifier 102 are controlled to be in the working state, the second dc discharge circuit and the third dc discharge circuit are selected to work.

The third embodiment of the present application has the technical effects that: when the external dc port 106 is connected to the dc power consuming device, the external battery 101 forms a first dc discharge circuit with the dc power consuming device through the power switch module 104 and the first winding unit 131 in the energy conversion device; the external battery 101 forms a second direct-current discharge circuit through the power switch module 104, the second winding unit 132 and the direct-current electric equipment in the energy conversion device; the external battery 101 forms a third dc discharge circuit through the reversible PWM rectifier 102, the first winding unit 131 and the dc power consuming device in the energy conversion device; the external battery 101 forms a fourth dc discharge circuit with the dc power consuming device through the reversible PWM rectifier 102 and the second winding unit 132 in the energy conversion device, and one dc discharge circuit or two dc discharge circuits can be selected to operate simultaneously according to different requirements, where the first dc discharge circuit and the third dc discharge circuit cannot operate simultaneously, the second dc discharge circuit and the fourth dc discharge circuit cannot operate simultaneously, and especially when the two dc discharge circuits operate simultaneously, the discharge current and the discharge efficiency of the dc power consuming device can be increased, thereby realizing rapid charging of the dc power consuming device.

As a fourth embodiment, as shown in fig. 2, the energy conversion device further includes a first switch module 108, and the third neutral line of the second winding unit 132 is connected to the first winding unit 131 and the external dc port 106 through the first switch module 108.

When the first switching module 108 is in the off state, the external ac port 107 forms an ac charging circuit or an ac discharging circuit with the external battery 101 through the energy conversion device, wherein the first neutral line of the first winding unit 131 and the third neutral line of the second winding unit 132 are respectively connected to the external ac port 107.

The external ac port 107 forms an ac charging circuit or an ac discharging circuit via the first winding unit 131, the first bidirectional arm 141, the second winding unit 132, the second bidirectional arm 142, and the external battery 101 in the energy conversion device.

In an alternating current charging mode, an external alternating current port 107, a second winding unit 132, a second bidirectional bridge arm 142, a first winding unit 131, a first bidirectional bridge arm 141 and an external battery 101 form an alternating current charging circuit, in the charging mode, an external charging port is connected with an alternating current power supply device to provide alternating current power for the alternating current charging circuit, the alternating current power supply device, the second winding unit 132, the second bidirectional bridge arm 142, the first bidirectional bridge arm 141 and the first winding unit 131 form an alternating current charging energy storage loop, the alternating current power supply device, the second winding unit 132, the second bidirectional bridge arm 142, the external battery 101, the first bidirectional bridge arm 141 and the first winding unit 131 form an alternating current charging energy storage and release loop, the alternating current charging circuit comprises an alternating current charging energy storage loop and an alternating current charging energy storage and release loop, and in the working process of the alternating current charging energy storage loop, the alternating current power supply device outputs electric energy to the alternating current charging energy storage loop to store the electric energy in the first winding unit 131 And in the second winding unit 132, in the working process of the ac charging energy storage release circuit, the ac power supply device, the first winding unit 131 and the second winding unit 132 charge the external battery 101 through the charging circuit together, so that the process that the ac power supply device charges the external battery 101 through the ac charging circuit is realized.

In the alternating current discharge mode, an external battery 101, a second bidirectional arm 142, a second winding unit 132, a first winding unit 131 of a first bidirectional arm 141 and an external direct current port 106 form an alternating current discharge circuit, in the discharge mode, the external direct current port 106 is connected with an alternating current electric device, the external battery 101 supplies alternating current power to the alternating current electric device through the alternating current discharge circuit, the external battery 101, the second bidirectional arm 142, the second winding unit 132, the alternating current electric device, the first winding unit 131 and the first bidirectional arm 141 form an energy storage loop, the second bidirectional arm 142, the second winding unit 132, the alternating current electric device, the first winding unit 131 and the first bidirectional arm 141 form a discharge loop, the alternating current discharge circuit comprises an energy storage loop and a discharge loop, in the working process of the energy storage loop, the external battery 101 outputs electric energy through the energy storage loop to store the electric energy in the motor coil 103, during the operation of the discharge circuit, the motor coil 103 discharges the ac electric device, and the process of discharging the ac electric device from the external battery 101 through the ac discharge circuit is realized.

The fourth embodiment of the present application has the technical effects that: when an external ac port 107 is connected to an ac power supply device, an ac charging circuit is formed by the external ac port 107, the second winding unit 132, the second bidirectional arm 142, the first winding unit 131, the first bidirectional arm 141 and the external battery 101, and when an external charging port is connected to an ac power consumption device, an ac discharging circuit is formed by the external battery 101, the second bidirectional arm 142, the second winding unit 132, the first winding unit 131 of the first bidirectional arm 141 and the ac power consumption device, so that dc charging, dc discharging, ac charging or ac discharging can be selected according to different modules connected to the external charging port, the charging and discharging functions of the energy conversion device are increased, and the first switching module can be controlled to disconnect the electrical connection between the first winding unit and the second winding unit, that is, isolation is realized.

As a fifth embodiment, the external dc port 106 forms a heating circuit with the external battery 101 through the energy conversion device;

alternatively, the external ac port 107 forms a heating circuit with the external battery 101 via the energy conversion device;

alternatively, the external battery 101 forms a heating circuit with the external dc port 106 through the energy conversion device;

alternatively, the external battery 101 forms a heating circuit with the external ac port 107 via the energy conversion device.

When the external dc port 106 is connected to the dc power supply device, the first winding unit 131, and the first bidirectional arm 141 form a first heating circuit, the dc power supply device, the second winding unit 132, and the second bidirectional arm 142 form a second heating circuit, the dc power supply device, the first winding unit 131, and the reversible PWM rectifier 102 form a third heating circuit, and the dc power supply device, the second winding unit 132, and the reversible PWM rectifier 102 form a fourth heating circuit, where the heating mode of the heating circuit is that when the dc power supply device outputs current to the energy conversion device, the current flows through the motor coil 103, so that the motor coil 103 consumes power and generates heat.

When the external ac port 107 is connected to the ac power supply device, the second winding unit 132, the second bidirectional arm 142, the first winding unit 131, and the first bidirectional arm 141 form a heating circuit in such a manner that when the ac power supply device outputs a current to the energy conversion device, the current flows through the motor coil 103, and the motor coil 103 consumes power and generates heat.

When the external dc port 106 is connected to the dc power consumption device, the external battery 101, the first bidirectional arm 141, the first winding unit 131, and the dc power consumption device form a first heating circuit; the external battery 101, the second bidirectional arm 142, the second winding unit 132, and the dc power consuming device form a second heating circuit; the external battery 101, the reversible PWM rectifier 102, the first winding unit 131, and the dc power consuming device form a third heating circuit; the external battery 101, the reversible PWM rectifier 102, the second winding unit 132 and the dc power consuming device form a fourth heating circuit; the heating circuit is heated in such a manner that when an external battery outputs a current to the energy conversion device, the current flows through the motor coil 103, and the motor coil 103 consumes power to generate heat.

When the external battery 101 is connected to the ac consumer, the external battery, the second winding unit 132, the second bidirectional arm 142, the first winding unit 131, the first bidirectional arm 141, and the ac consumer form a heating circuit in such a manner that when the external battery outputs a current to the energy conversion device, the current flows through the motor coil 103, and the motor coil 103 consumes power and generates heat.

The technical effects of the fifth embodiment of the application are as follows: the direct current power supply device is connected through the direct current port 106 or the alternating current power supply device is connected through the alternating current port 107, and power is taken from the direct current power supply device or the alternating current power supply device to enable the motor coil 103 to consume power and generate heat, so that a medium in a cooling loop flowing through the motor coil 103 is heated, and the heated medium heats other modules when flowing through the other modules through the cooling loop.

As a sixth embodiment, the reversible PWM rectifier 102 operates the dc charging circuit and the heating circuit in cooperation, or operates the driving circuit and the heating circuit in cooperation, or operates the dc charging circuit, the heating circuit, and the driving circuit in cooperation, or operates the dc discharging circuit and the heating circuit in cooperation, or operates the dc discharging circuit, the heating circuit, and the driving circuit in cooperation, or operates the ac charging circuit and the heating circuit in cooperation, or operates the ac charging circuit, the heating circuit, and the driving circuit in cooperation, or operates the ac discharging circuit and the heating circuit in cooperation, or operates the ac discharging circuit, the heating circuit, and the driving circuit in cooperation, in accordance with an external control signal.

As an embodiment, as shown in FIG. 3, the reversible PWM rectifier 102 includes M₁A road bridge arm;

the first winding unit 131 comprises a set of m₁Phase winding, m₁Each of the phase windings includes n₁A coil branch of n for each phase winding₁The coil branches are connected together to form a phase terminal m₁Phase end point and M of phase winding₁M in road bridge arm₁The middle points of each path of bridge arm of the path bridge arms are connected in one-to-one correspondence, and m is₁N of each of the phase windings₁One of the coil branches is also respectively connected with n of other phase windings₁One of the coil branches is connected to form n₁A connection point, n₁A connection point forming T₁A neutral point, T₁Each neutral point leads out a first neutral line and a second neutral line, where n₁≥2，m₁≥1，T₁≥2，M₁＝m₁And n is₁，m₁，T₁，M₁Are all integers;

the second winding unit 132 includes a set of m₂Phase winding, m₂Each of the phase windings includes n₂A coil branch of n for each phase winding₂The coil branches are connected together to form a phase terminal m₂Phase end point and M of phase winding₁M in road bridge arm₂The middle points of each path of bridge arm of the path bridge arms are connected in one-to-one correspondence, and m is₂N of each of the phase windings₂One of the coil branches is also respectively connected with n of other phase windings₂One of the coil branches is connected to form n₂A connection point, n₂A connection point forming T₂A neutral point, T₂Each neutral point leads out a third neutral line and a fourth neutral line, where n₂≥2，m₂≥1，M₁≥m₁+m₂，T₂N is not less than 2 and₂，m₂，M₁，T₂are all integers.

A first neutral line connects the first terminal of the dc port 106, the first terminal of the ac port 107 and the first terminal of the first switch module, a second neutral line connects the power switch module 104, a third neutral line connects the second terminal of the switch module and the second terminal of the ac port 107, and a fourth neutral line connects the power switch module 104.

The first winding unit 131 and the second winding unit 132 may include coil branches connected to form independent neutral points or coil branches connected to form non-independent neutral points, the independent neutral point refers to a neutral point formed by one connection point, the non-independent neutral points refer to neutral points formed by at least two connection points being connected in common, and the series connection between the first winding unit 131 and the second winding unit 132 through the switch module may be a series connection between neutral lines led out by two independent neutral points, a series connection between neutral lines led out by two non-independent neutral points, or a series connection between a neutral line led out by an independent neutral point and a neutral line led out by a non-independent neutral point.

The technical effects of the embodiment are as follows: by setting different structures of the coil branches formed in the first winding unit 131 and the second winding unit 132, the equivalent phase inductance of the motor is different, and the current flowing in the motor is different, so that the required charging power and inductance can be obtained, and the charging power and the charging and discharging performance can be improved.

When m is shown in FIG. 4₁＝m₂＝3，M₁＝6，n₁When 2, the first winding unit 131 forms 2 connection points, the 2 connection points form a first neutral line and a second neutral line, respectively, the second winding unit 132 forms 2 connection points, the 2 connection points form a third neutral line and a fourth neutral line, respectively, and the second neutral line and the third neutral line are connected by a switch K8.

When m is₁＝m₂＝3，M₁＝6，n₁When the number of the first winding unit 131 is 4, the 4 connection points form a first neutral line and a second neutral line, respectively, and the second winding forms a second windingThe group unit 132 forms 4 connection points, and the 4 connection points respectively form a third neutral line and a fourth neutral line, which are connected by a switch K8, as shown in fig. 5, the first neutral line, the second neutral line, the third neutral line and the fourth neutral line are drawn from an independent neutral point formed by one connection point, and as shown in fig. 6, the first neutral line, the second neutral line, the third neutral line and the fourth neutral line are drawn from a dependent neutral point formed by two connection points.

As an embodiment of the connection relationship of the internal modules of the energy conversion device, as shown in fig. 2, in the reversible PWM rectifier 102, the first ends of each of the bridge arms are connected together to form a first bus end, and the second ends of each of the bridge arms are connected together to form a second bus end;

power switch module 104 includes a first bidirectional arm 141 and a second bidirectional arm 142, a first end of first bidirectional arm 141 is connected to a first end of second bidirectional arm 142, a positive end of battery 101, and a first bus end, a second end of first bidirectional arm 141 is connected to a second end of second bidirectional arm 142, a negative end of battery 101, and a second bus end, a third end of first bidirectional arm 141 is connected to a second neutral line, and a third end of second bidirectional arm 142 is connected to a fourth neutral line.

For the power switch module 104, the first bidirectional bridge arm 141 includes a thirteenth power switch unit and a fourteenth power switch unit, an input end of the thirteenth power switch unit is the first end of the power switch module 104, an output end of the fourteenth power switch unit is the second end of the power switch module 104, and an output end of the thirteenth power switch unit and an input end of the fourteenth power switch unit are connected in common and form a third end of the power switch module 104;

the second bidirectional bridge arm 142 includes a fifteenth power switch unit and a sixteenth power switch unit, an input end of the fifteenth power switch unit is the first end of the power switch module 104, an output end of the sixteenth power switch unit is the second end of the power switch module 104, and an output end of the fifteenth power switch unit and an input end of the sixteenth power switch unit are connected in common and form a third end of the power switch module 104.

Wherein, the thirteenth power switch unit, the fourteenth power switch unit, the fifteenth power switch unit, the sixteenth power switch unit, the IGBT, the MOSFET and the SiC tube, and the like, the two power switch units form a phase bridge arm, the thirteenth power switching unit or the fourteenth power switching unit may be turned on or off by the control module outputting PWM signals to the thirteenth power switching unit and the fourteenth power switching unit, the thirteenth power switching unit, the fourteenth power switching unit, the fifteenth power switching unit, and the sixteenth power switching unit may be controlled, the internal winding coil of the first winding unit 131 and the internal winding coil of the second winding unit 132 in the motor coil 103 may be formed in a series structure, further, the first winding unit 131 and the second winding unit 132 form a charge/discharge circuit with the power switch module 104 and the external battery 101.

The technical effects of the embodiment are as follows: the power switch module 104 is provided with a thirteen power switch unit, a fourteenth power switch unit, a fifteenth power switch unit and a sixteenth power switch unit, and the thirteen power switch unit, the fourteenth power switch unit, the fifteenth power switch unit and the sixteenth power switch unit, the external battery 101, the motor coil 103 and the charging port are controlled to form an alternating current charging and discharging loop and a direct current charging and discharging loop, so that the power supply equipment performs alternating current charging or direct current charging on the power battery 101 through the charging and discharging loop, the external battery 101 performs alternating current discharging or direct current discharging on the power equipment through the charging and discharging loop, and when performing alternating current charging and discharging, the first winding unit 131 and the second winding unit 132 enable the winding coils inside the motor to be simultaneously used in series through the first neutral wire, the second neutral wire, the third neutral wire and the fourth neutral wire, the inductance is increased, the charging and discharging current ripples are small, the loss is small, and the external radiation is small; the current of each phase winding of the motor is basically consistent and in the same phase, the synthesized magnetic field intensity generated by the first winding unit 131 is basically zero and the synthesized magnetic field intensity generated by the second winding unit 132 is basically zero, the synthesized magnetic field intensity generated by all windings of the motor is basically zero, the rotor of the motor has no risk of demagnetization, the motor has no torque output, the synthesized magnetic field intensity is basically zero, the iron loss of the motor is greatly reduced, the efficiency during charging and discharging is improved, and meanwhile, because the phase current of the motor cannot be sampled by the Hall sensor, a current Hall sensor needs to be added on a neutral line led out from any one of the motors.

Fig. 7 is a circuit diagram of an energy conversion device provided in this embodiment, the energy conversion device includes a reversible PWM rectifier 102, a motor coil 103, a power switch module 104, a switch K1, a switch K2, a resistor R, a switch K3, and a capacitor C1, a positive electrode of an external battery 101 is connected to a first end of the switch K1 and a first end of the switch K2, a second end of the switch K2 is connected to a first end of the resistor R, a second end of the switch K1 and a second end of the resistor R are connected to a first end of the capacitor C1, a negative electrode of the battery 101 is connected to a first end of the switch K3, a second end of the switch K3 is connected to a second end of the capacitor C1, the reversible PWM rectifier 102 includes a six-phase bridge arm, the first-phase bridge arm includes a first power switch unit and a second power switch unit connected in series, the second-phase bridge arm includes a third power switch unit and a fourth power switch unit connected in series, the third-phase bridge arm includes a fifth power switch unit and a sixth power switch unit connected in series, the fourth phase bridge arm comprises a seventh power switch unit and an eighth power switch unit which are connected in series, the fifth phase bridge arm comprises a ninth power switch unit and a tenth power switch unit which are connected in series, the sixth phase bridge arm comprises an eleventh power switch unit and a twelfth power switch unit which are connected in series, the input end of the first power switch unit, the input end of the third power switch unit, the input end of the fifth power switch unit, the input end of the seventh power switch unit, the input end of the ninth power switch unit and the input end of the eleventh power switch unit are connected to the first end of a capacitor C1 in common and form a first junction end, the output end of the second power switch unit, the output end of the fourth power switch unit, the output end of the sixth power switch unit, the output end of the eighth power switch unit, the output end of the tenth power switch unit and the output end of the twelfth power switch unit are connected to the second end of a capacitor C1 in common and form a second junction end, the first power switch unit comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the seventh power switch unit comprises a seventh upper bridge arm VT7 and a seventh upper bridge diode VD7, the eighth power switch unit comprises an eighth lower bridge arm VT8 and an eighth lower bridge diode VD8, the ninth power switch unit comprises a ninth upper bridge arm VT9 and a ninth upper bridge diode VD9, the tenth power switch unit comprises a tenth lower bridge arm VT10 and a tenth lower bridge diode VD10, the eleventh power switch unit comprises an eleventh upper bridge arm VT11 and an eleventh upper bridge diode VD11, the twelfth power switch unit comprises a twelfth lower bridge arm VT12 and a twelfth lower bridge diode VD12, the power switch module 104 comprises a thirteenth power switch unit, a fourteenth power switch unit, a fifteenth power switch unit and a sixteenth power switch unit, the thirteenth power switch unit comprises a thirteenth upper bridge arm VT13 and a fourteenth upper bridge diode VD13, the fourteenth power switch unit comprises a fourteenth lower bridge arm VT14 and a fourteenth lower bridge diode VD14, the thirteenth power switch unit comprises a thirteenth upper bridge arm VT13 and a fourteenth upper bridge diode VD13, the fifteenth power switch unit comprises a fifteenth upper bridge arm VT15 and a fifteenth upper bridge diode VD15, the sixteenth power switch unit comprises a sixteenth lower bridge arm VT16 and a sixteenth lower bridge diode VD16, and the input end of the thirteenth power switch unit and the input end of the fifteenth power switch unit are respectively connected to the first bus end The input end of the fourteenth power switch unit and the input end of the sixteenth power switch unit are respectively connected with the second bus terminal, the first winding unit 131 comprises a set of three-phase windings, each phase winding comprises two coils, a coil U1 and a coil U2 in the first phase coil are connected with a midpoint U of the fourth phase bridge arm in a common manner, a coil V1 and a coil V2 in the second phase coil are connected with a midpoint V of the fifth phase bridge arm in a common manner, a coil W1 and a coil W2 in the third phase coil are connected with a midpoint W of the sixth phase bridge arm in a common manner, a coil U2, a coil V2 and a coil W2 are connected in a common manner to form a first connection point n1, a first connection point n1 forms a first independent neutral point, a coil U1, a coil V1 and a coil W1 are connected in a common manner to form a second connection point n2, a second connection point n2 forms a second independent neutral point, a set of three-phase windings 132, each phase winding comprises two coils, a coil a1 and a coil a2 in a common manner, the coil B1 and the coil B2 in the second-phase coil are connected to the midpoint B of the second-phase bridge arm in common, the coil C1 and the coil C2 in the third-phase coil are connected to the midpoint C of the third-phase bridge arm in common, the coil A1, the coil B1 and the coil C1 are connected in common to form a fourth connection point n4, the fourth connection point n4 forms a fourth independent neutral point, the coil A2, the coil B2 and the coil C2 are connected in common to form a third connection point n3, the third connection point n3 forms a third independent neutral point, the first independent neutral point leads out a first neutral line, the second independent neutral point leads out a second neutral line, the third independent neutral point leads out a third neutral line, the fourth independent neutral point leads out a fourth neutral line, the energy conversion module further comprises a switch K4, a switch K5, a switch K6, a switch K8 and a capacitor C2, and the first end and the second end of the external DC port 106 are connected to the first end of the switch K6 and the second end of the switch K599 and the switch K6 respectively, A first terminal of the capacitor C2, a first terminal of the switch K8, a second terminal of the switch K8 is connected to the third neutral line, a second terminal of the switch K4 is connected to the first neutral line, and a second terminal of the switch K5 is connected to a second terminal of the capacitor C2 and a second bus terminal of the reversible PWM rectifier 102.

As shown in fig. 8, the switch K8 may be disposed between the first neutral line and the third neutral line, and one end of the switch K8 is connected to the first neutral line and the first end of the switch K4, and the other end is connected to the third neutral line, unlike the position at which the switch K8 is disposed in fig. 7.

As an embodiment, as shown in fig. 9, based on fig. 8, the energy conversion device further includes a switch K7 and a switch K9, wherein a first end of the external ac port 107 is connected to the first neutral line through the switch K9 and a first end of the switch K4, and a second end of the external ac port 107 is connected to the second neutral line through the switch K7.

As an embodiment, as shown in fig. 10, based on fig. 7, the energy conversion device further includes a switch K7 and a switch K9, wherein a first end of the external ac port 107 is connected to the first neutral line and a first end of the switch K4 through the switch K9, and a second end of the external ac port 107 is connected to the second neutral line and a first end of the switch K8 through the switch K7.

In one embodiment, the external battery 101 and the energy conversion device may be connected by a switch module, the switch module includes a first switch, a second switch, a resistor, and a third switch, a first end of the first switch is connected to a first end of the second switch and constitutes a first end of the first switch module, a second end of the second switch is connected to a first end of the resistor, a second end of the resistor is connected to a second end of the first switch and constitutes a third end of the first switch module, a first end of the third switch is a second end of the first switch module, and a second end of the third switch is a fourth end of the first switch module.

As shown in fig. 10, the first switch may be a switch K1, the second switch may be a switch K2, the third switch may be a switch K3, and the resistor may be a resistor R.

This embodiment has increased a branch road, is equipped with second switch and resistance on this branch road, and this branch road is used for realizing that power battery 101 charges in advance to first energy storage module, switches on the second switch earlier promptly and makes power battery 101 charge to first energy storage module, owing to set up resistance, can control the electric current size of precharging, controls second switch disconnection and first switch and switches on again after the completion of precharging.

The technical effects of the embodiment are as follows: through set up the branch road that is used for carrying on precharging in first switch module, realized the control to the charging current of power battery 101 output to first energy storage module, promoted the charging safety nature of rechargeable battery 101 and first energy storage module in the charging process.

The power switch control mode for the reversible PWM rectifier 102 may be any one or a combination of the following: if at least one bridge arm in the inverter is selected for control, the control is flexible and simple.

The optimal synchronous control mode of the bridge arm of the selection controller is synchronously switched on and switched off, so that the current of the motor is increased simultaneously when the motor is switched on and reduced simultaneously when the motor is switched off, the current of the motor tends to be equal at any moment, the resultant magnetomotive force of the motor tends to be zero, the magnetic field of the stator tends to be zero, and the motor basically has no torque. When the inductance of motor itself does not satisfy the ripple requirement, can adopt controller phase control of staggering, 360/motor phase counts are regarded as to the angle of staggering, for example the three-phase staggers about 120 phase control, and the positive and negative ripple of three-phase coil superposes each other like this, offsets each other to can make total ripple greatly reduced, for example two-phase staggers about 180 phase control, and the positive and negative ripple of two-phase coil superposes each other like this, offsets each other, thereby can make total ripple greatly reduced.

The control method for the three-phase bridge arm in the reversible PWM rectifier 102 may be any one or a combination of the following: if any one or any two of A, B, C three-phase bridge arms and three bridge arms can be realized, 7 control heating modes are realized, and the method is flexible and simple. The switching of the bridge arms can be beneficial to realizing the large, medium and small selection of heating power, 1, any phase of bridge arm power switch can be selected for control, and three phase bridge arms can be switched in turn, for example, an A phase of bridge arm works alone first, a first power switch unit and a fourth power switch unit are controlled to heat for a period of time, then a B phase of bridge arm works alone, a third power switch unit and a sixth power switch unit are controlled to heat for the same period of time, then a C phase of bridge arm works alone, a fifth power switch unit and a second power switch unit are controlled to heat for the same period of time, and then the A phase of bridge arm works, so that the three phase inverter and a three phase coil are circulated to be electrified and heated in turn; 2. any two-phase bridge arm power switches can be selected for control, and three-phase bridge arms can be switched in turn, for example, an AB-phase bridge arm works first, a first power switch unit, a fourth power switch unit, a third power switch unit and a sixth power switch unit are controlled to heat for a period of time, then a BC-phase bridge arm works, a third power switch unit, a sixth power switch unit and a second power switch unit are controlled to heat for the same time, then a CA-phase bridge arm works, a fifth power switch unit, a second power switch unit, a first power switch unit and a fourth power switch unit are controlled to heat for the same time, and then the AB-phase bridge arm works, and the steps are cycled to realize a three-phase inverter; 3. preferably, the three-phase bridge arm power switches can be selected to be controlled simultaneously, namely, the three-phase upper bridge arm is switched on simultaneously, and the three-phase lower bridge arm is switched off simultaneously; the three-phase upper bridge arm is turned off at the same time, the three-phase lower bridge arm is turned on at the same time, the three-phase power bridge arm is equivalent to a single DC/DC, three-phase currents are balanced due to theoretical balance of a three-phase loop, the three-phase inverter and the three-phase coil are heated and balanced, the three-phase currents are basically direct currents and have basically consistent average values, and due to symmetry of three-phase windings, three-phase synthetic magnetomotive force in the motor is basically zero, a stator magnetic field is basically zero, the motor basically has no torque, and therefore stress of a transmission system is greatly reduced.

The following describes the technical solution of the embodiment of the present application in detail through a specific circuit structure:

as shown in fig. 11, the energy conversion apparatus includes a reversible PWM rectifier 102, a motor coil 103, a power switch module 104, a switch K1, a switch K2, a resistor R, a switch K3, and a capacitor C1, wherein a positive electrode of a battery 101 is connected to a first end of the switch K1 and a first end of the switch K2, a second end of the switch K2 is connected to a first end of the resistor R, a second end of the switch K1 and a second end of the resistor R are connected to a first end of the capacitor C1, a negative electrode of the battery 101 is connected to a first end of the switch K3, a second end of the switch K3 is connected to a second end of the capacitor C1, the reversible PWM rectifier 102 includes a six-phase bridge arm, the first-phase bridge arm includes a first power switch unit and a second power switch unit connected in series, the second-phase bridge arm includes a third power switch unit and a fourth power switch unit connected in series, the third-phase bridge arm includes a fifth power switch unit and a sixth power switch unit connected in series, the fourth phase bridge arm comprises a seventh power switch unit and an eighth power switch unit which are connected in series, the fifth phase bridge arm comprises a ninth power switch unit and a tenth power switch unit which are connected in series, the fourth phase bridge arm comprises an eleventh power switch unit and a twelfth power switch unit which are connected in series, the input end of the first power switch unit, the input end of the third power switch unit, the input end of the fifth power switch unit, the input end of the seventh power switch unit, the input end of the ninth power switch unit and the input end of the eleventh power switch unit are connected to the first end of a capacitor C1 in common and form a first junction end, the output end of the second power switch unit, the output end of the fourth power switch unit, the output end of the sixth power switch unit, the output end of the eighth power switch unit, the output end of the tenth power switch unit and the output end of the twelfth power switch unit are connected to the second end of a capacitor C1 in common and form a second junction end, the first power switch unit comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the seventh power switch unit comprises a seventh upper bridge arm VT7 and a seventh upper bridge diode VD7, the eighth power switch unit comprises an eighth lower bridge arm VT8 and an eighth lower bridge diode VD8, the ninth power switch unit comprises a ninth upper bridge arm VT9 and a ninth upper bridge diode VD9, the tenth power switch unit comprises a tenth lower bridge arm VT10 and a tenth lower bridge diode VD10, the eleventh power switch unit comprises an eleventh upper bridge arm VT11 and an eleventh upper bridge diode VD11, the twelfth power switch unit comprises a twelfth lower bridge arm VT12 and a twelfth lower bridge diode VD12, the power switch module 104 comprises a thirteenth power switch unit and a thirteenth power switch unit connected in series, the thirteenth power switch unit comprises a thirteenth upper bridge arm VT13 and a thirteenth upper bridge diode VD13, the fourteenth power switch unit comprises a fourteenth lower bridge arm VT14 and a fourteenth lower bridge diode VD14, an input end of the thirteenth power switch unit and an input end of the fifteenth power switch unit are connected to a first current sink, an output end of the fourteenth power switch unit and an output end of the sixteenth power switch unit are connected to a second current sink, the first winding unit 131 comprises a set of three-phase windings, each phase winding comprises two coils, the coils U1 in the first phase coil, a coil, Coil U2 is connected to a midpoint U of a fourth phase arm in common, coil V1 and coil V2 in the second phase coil are connected to a midpoint V of a fifth phase arm in common, coil W1 and coil W2 in the third phase coil are connected to a midpoint W of a sixth phase arm in common, coil U2, coil V2 and coil W2 are connected in common to form a first connecting point n1, first connecting point n1 forms a first independent neutral point, coil U1, coil V1 and coil W1 are connected in common to form a second connecting point n2, second connecting point n2 forms a second independent neutral point, second winding unit 132 is provided with a set of three-phase windings, each phase winding comprises two coils, coil A1 and coil A2 in the first phase coil are connected to a midpoint A of the first phase arm in common, coil B1 and coil B2 in the second phase coil are connected to a midpoint B of the second phase arm in common, coil C1 and coil C2 in the third phase coil are connected to a third phase arm in common, coil C1 and coil C867 and coil B4 and coil C8672 in common to form a midpoint 4, the fourth connection point n4 forms a fourth independent neutral point, the coil a2, the coil B2 and the coil C2 are connected together to form a third connection point n3, the third connection point n3 forms a third independent neutral point, a first neutral line is led out of the first independent neutral point, the energy conversion module further comprises a switch K4, a switch K5, a switch K6, a switch K8 and a capacitor C2, the first end and the second end of the external dc port 106 are connected to the first end of the switch K5 and the first end of the switch K6 respectively, the second end of the switch K6 is connected to the first end of the switch K4, the first end of the switch K8 and the first end of the capacitor C2, the second end of the switch K4 is connected to the first neutral line, the second end of the switch K8 is connected to the third neutral line, the second end of the switch K5 is connected to the second end of the capacitor C2 and the second sink terminal of the reversible rectifier 102, the energy conversion device further comprises a switch K7 and a first end of the switch K9, the first end of the external switch K9 and the first end of the switch K4, the second terminal of the external ac port 107 is connected to the second neutral line and the first terminal of the switch K8 via the switch K7.

When the energy conversion device is connected to the dc power supply device through the external dc port 106, the dc power supply device charges the energy conversion device with dc power, and the implementation process is as follows:

as shown in fig. 11, the switch K2 and the switch K3 are controlled to be turned on to precharge the first capacitor C1, the switch K4 is kept turned off, the switch K5 is turned off, the switch K6 is turned off, the switch K2 is controlled to be turned off after the switch K1 is controlled to be turned on after the precharge is completed, the switch K4 is controlled to be turned on after the target voltage range value sent by the battery 101 manager is received, the capacitor C2 is subjected to precharge control, the controller determines that the voltage sample U on the capacitor C2 is precharged within the sent target value range, the switch K5, the switch K6 and the switch K8 are controlled to be turned on, the charging pile determines that the voltage sample U on the capacitor C2 is normally discharged within the sent target value range, otherwise, all the switches are turned off, and the charging and discharging are stopped.

As shown in fig. 11, all power switch units of the reversible PWM rectifier 102 are controlled to be in an off state, and the thirteenth upper arm VT13 and the fourteenth lower arm VT14 in the power switch module 104 are controlled to be turned off, and the dc power supply device, the switch K6, the switch K4, the first winding unit 131 (the coil U2, the coil V2, the coil W2, the coil U1, the coil V1, and the coil W1), the thirteenth upper arm diode VD13, the switch K1, the external battery 101, the switch K3, and the switch K5 form a first dc charging energy storage and release circuit; the fifteenth upper bridge arm VT15 and the sixteenth lower bridge arm VT16 in the power switch module 104 are controlled to be turned off, the dc supply device, the switch K6, the switch K8, the second winding unit 132 (the coil a1, the coil B1, the coil C1, the coil a2, the coil B2, the coil C2), the sixteenth lower bridge arm VT16, and the switch K5 form a second dc charging energy storage loop, at this time, the dc supply device releases energy storage of the first winding unit 131 (the coil U2, the coil V2, the coil W2, the coil U1, the coil V1, and the coil W1) to charge the battery 101, and the dc supply device stores energy storage of the second winding unit 132 (the coil a1, the coil B1, the coil C1, the coil a2, the coil B2, and the coil C2).

As shown in fig. 12, all power switch units of the reversible PWM rectifier 102 are controlled to be in an off state, and the thirteenth upper arm VT13 and the fourteenth lower arm VT14 in the switch module are controlled to be off, and the fourteenth lower arm VT14 in the switch module is controlled to be on, so that the dc power supply device, the switch K6, the switch K4, the first winding unit 131 (the coil U2, the coil V2, the coil W2 and the coil U1, the coil V1 and the coil W1), the fourteenth lower arm VT14 and the switch K5 form a first dc charging energy storage loop, the dc power supply device, the switch K6, the second winding unit 132 (the coil a 6, the coil B6, the coil C6 and the coil a 6, the coil B6, the coil C6), the fifteenth upper bridge diode VD6, the switch K6, the external battery 101 and the switch K6 form a second dc charging energy storage release loop, and at this time, the dc power supply device performs energy storage on the second winding unit 132 (the coil U6, the coil V6, the dc power supply device and the first winding unit 131 (coil a1, coil B1, coil C1, and coil a2, coil B2, and coil C2) charge the external battery 101.

The alternating conduction of the thirteenth upper bridge arm VT13 and the fourteenth lower bridge arm VT14 is controlled to enable the first direct current charging energy storage loop and the first direct current charging energy storage release loop to alternately supply power to an external battery 101 through the direct current power supply equipment, the alternating conduction of the fifteenth upper bridge arm VT15 and the sixteenth lower bridge arm VT15 is controlled to enable the second direct current charging energy storage loop and the second direct current charging energy storage release loop to alternately supply power to the external battery 101 through the direct current power supply equipment, the first direct current charging energy storage loop and the second direct current charging energy storage release loop are enabled to simultaneously work through the staggered phase control, and then the second direct current charging energy storage loop and the first direct current charging energy storage release loop are enabled to simultaneously work.

When the ac port 107 of the energy conversion device is connected to the ac power supply equipment, the ac power supply equipment performs ac discharge on the energy conversion device, which is implemented as follows:

and controlling the second switch K2 and the third switch K3 to be conducted to precharge the first capacitor C1, keeping the fourth switch K4 and the fifth switch K5 disconnected, controlling the second switch K2 to disconnect the first switch K1 from being conducted after the precharging is finished, detecting whether the voltage and the frequency of an alternating current charging port outside the seventh switch K7 and the ninth switch K9 are in a specified range after the battery 101 manager detects that the alternating current power grid or equipment is connected, closing the seventh switch K7 and the ninth switch K9 in the range, otherwise, disconnecting all the switches, and stopping charging and discharging.

The unipolar control alternating current discharge of the energy conversion device by the alternating current power supply equipment comprises the following processes:

as shown in fig. 13, the energy storage process of the ac power supply device for the positive half cycle of the energy conversion device is as follows: when detecting that the grid voltage at the ac charging port is positive at the switch K7 and negative at the switch K9, controlling all power switch units and the switch K8 of the reversible PWM rectifier 102 to be in an off state, and controlling the thirteenth upper bridge arm VT13, the fourteenth lower bridge arm VT14, the fifteenth upper bridge arm VT15, and the sixteenth lower bridge arm VT16 in the power switch module 104 to be turned off, the current flows: alternating current power supply equipment, a switch K7, a second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2 and coil C2), a sixteenth lower arm VT16, a fourteenth lower bridge diode VD14, a first winding unit 131 (coil U2, coil V2, coil W2 and coil U1, coil V1 and coil W1), and a switch K9 flow back to the alternating current power supply equipment, and the alternating current power supply equipment performs forward energy storage on the first winding unit 131 (coil a1, coil B1 and coil C1) and the second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2 and coil C2).

As shown in fig. 14, the energy storage releasing process of the ac power supply device for the positive half period of the energy conversion device is as follows: all power switch units and a switch K8 of the reversible PWM rectifier 102 are controlled to be in an off state, and a thirteenth upper bridge arm VT13, a fourteenth lower bridge arm VT14, a fifteenth upper bridge arm VT15 and a sixteenth lower bridge arm VT16 in the power switch module 104 are controlled to be off, so that the current flows to: an ac power supply device, a switch K7, a second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2, coil C2), a fifteenth upper bridge diode VD15, a switch K1, an external battery 101, a fourteenth lower bridge diode VD14, a first winding unit 131 (coil U2, coil V2, coil W2 and coil U1, coil V1, coil W1), a switch K9 flowing back to the ac power supply device, the first winding unit 131 (coil U2, coil V2, coil W2 and coil U1, coil V1, coil W1) and the second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2, coil C2) discharging stored energy from the external forward battery 101.

As shown in fig. 15, in the process of storing energy in the negative half-cycle of the energy conversion device by the ac power supply device, when it is detected that the grid voltage at the ac charging port is positive in the switch K9 and negative in the switch K7, all the power switch units and the switch K8 of the reversible PWM rectifier 102 are controlled to be in the off state, the thirteenth upper leg VT13, the fourteenth lower leg VT14, the fifteenth upper leg VT15, and the sixteenth lower leg VT16 in the power switch module 104 are controlled to be off, and the current flows: alternating current power supply equipment, a switch K9, a first winding unit 131 (coil U2, coil V2, coil W2 and coil U1, coil V1 and coil W1), a thirteenth upper bridge diode VD13, a fifteenth upper bridge arm VT15, a second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2 and coil C2), a switch K7, and a current flows back to the alternating current power supply equipment, and the alternating current power supply equipment performs negative energy storage on the first winding unit 131 (coil U2, coil V2, coil W2 and coil U1, coil V1 and coil W1) and the second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2 and coil C2).

As shown in fig. 16, the ac power supply apparatus releases the stored energy in the negative half cycle of the energy conversion device: all power switch units and a switch K8 of the reversible PWM rectifier 102 are controlled to be in an off state, and a thirteenth upper bridge arm VT13, a fourteenth lower bridge arm VT14, a fifteenth upper bridge arm VT15 and a sixteenth lower bridge arm VT16 in the power switch module 104 are controlled to be off, so that the current flows to: an ac power supply device, a switch K9, the first winding unit 131 (coil U2, coil V2, coil W2 and coil U1, coil V1, coil W1), a thirteenth upper bridge diode VD13, switch K1, the external battery 101, a sixteenth lower bridge diode VD16, the second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2, coil C2), and switch K7 flow back to the ac power supply device, and the ac power supply device, the first winding unit 131 (coil U2, coil V2, coil W2 and coil U1, coil V1, coil W1), and the second winding unit 132 (coil a1, coil B1, coil C1 and coil a2, coil B2, coil C2) perform negative energy storage release on the external battery 101.

A second embodiment of the present invention provides an energy conversion device, as shown in fig. 17, including a reversible PWM rectifier 102, a motor coil 103, and a power switch module 104, where the power switch module 104 includes a first bidirectional bridge arm 141, a second bidirectional bridge arm 142, and a third bidirectional bridge arm 143, the reversible PWM rectifier 102, the first bidirectional bridge arm 141, the second bidirectional bridge arm 142, and the third bidirectional bridge arm 143 are connected in parallel, the motor coil 103 includes a first winding unit 131, a second winding unit 132, and a third winding unit 133, a first neutral line and a second neutral line are further led out from the first winding unit 131, a third neutral line and a fourth neutral line are further led out from the second winding unit 132, a fifth neutral line and a sixth neutral line are further led out from the third winding unit 133, a second neutral line of the first winding unit 131 is connected to the first bidirectional bridge arm 141, a fourth neutral line of the second winding unit 133 is connected to the second bidirectional bridge arm 142, a sixth neutral line of the third winding unit 133 is connected to the third bidirectional leg 143;

an external direct current port 106 and an external battery 101 form a direct current charging circuit or a direct current discharging circuit through an energy conversion device, and the external battery 101 and a reversible PWM rectifier 102 and a motor coil in the energy conversion device form a driving loop 103; the first neutral line of the first winding unit 131, the third neutral line of the second winding unit 132, the fifth neutral line of the third winding unit 133, the first bidirectional arm 141, the second bidirectional arm 142, the third bidirectional arm 143, and the reversible PWM rectifier 102 are respectively connected to an external dc port 106, and the reversible PWM rectifier 102, the first bidirectional arm 141, the second bidirectional arm 142, and the third bidirectional arm 143 are respectively connected to an external battery 101.

In one embodiment, the multi-phase arms of the reversible PWM rectifier 102 are connected in parallel to form a first bus terminal and a second bus terminal, and the first bidirectional arm 141, the second bidirectional arm 142, and the third bidirectional arm 143 are connected in parallel to form a third bus terminal and a fourth bus terminal;

the second neutral line is connected to a midpoint of the first bidirectional leg 141, the first neutral line is connected to a first end of the external dc port 106, the fourth neutral line is connected to a midpoint of the second bidirectional leg 142, the third neutral line is connected to a first end of the external dc port 106, the sixth neutral line is connected to a midpoint of the third bidirectional leg 143, the fifth neutral line is connected to a first end of the external dc port 106, the third bus end is connected to the first bus end, and the fourth bus end is connected to the second bus end and a second end of the dc port.

In one embodiment, an external three-phase ac port connects the first neutral line, the third neutral line, and the fifth neutral line.

For the motor coil 103 and the reversible PWM rectifier 102, in particular, the reversible PWM rectifier 102 includes M₁A road bridge arm;

the first winding unit 131 comprises a set of m₁Phase winding, m₁Each of the phase windings includes n₁A coil branch of n for each phase winding₁The coil branches are connected together to form a phase terminal point, m₁Phase end point of phase winding and M₁M in road bridge arm₁The middle points of each path of bridge arm of the path bridge arms are connected in one-to-one correspondence, and m is₁N of each of the phase windings₁One of the coil branches is also respectively connected with n of other phase windings₁One of the coil branches is connected to form n₁A connection point, n₁A connection point forming T₁A neutral point, T₁Each neutral point leads out a first neutral line and a second neutral line, where n₁≥2，m₁≥1，T₁N is not less than 2 and₁，m₁，T₁are all integers;

the second winding unit 132 includes a set of m₂Phase winding, m₂Each of the phase windings includes n₂A coil branch of n for each phase winding₂The coil branches are connected together to form a phase terminal m₂Phase end point and M of phase winding₁M in road bridge arm₂The middle points of each path of bridge arm of the path bridge arms are connected in one-to-one correspondence, and m is₂N of each of the phase windings₂One of the coil branches is also respectively connected with n of other phase windings₂One of the coil branches is connected to form n₂A connection point, n₂A connection point forming T₂A neutral point, T₂Each neutral point leads out a third neutral line and a fourth neutral line, where n₂≥2，m₂≥1，T₂N is not less than 2₂，m₂，T₂Are all integers;

third stepThe winding unit comprises a set of m₃Phase winding, m₃Each of the phase windings includes n₃A coil branch of n for each phase winding₃The coil branches are connected together to form a phase terminal point, m₃Phase end point of phase winding and M₁M in road bridge arm₃The middle points of each path of bridge arm of the path bridge arms are connected in one-to-one correspondence, and m is₃N of each of the phase windings₃One of the coil branches is also respectively connected with n of other phase windings₃One of the coil branches is connected to form n₃A connection point, n₃A connection point forming T₃A neutral point, said T₃Each neutral point leads out a fifth neutral line and a sixth neutral line, where n₃≥2，m₃≥1，T₃≥2，M₁≥m₁+m₂+m₃And n is₃，m₃，T₃，M₃Are all integers.

as shown in fig. 18, the energy conversion apparatus includes a reversible PWM rectifier 102, a motor coil 103, a power switch module 104, a switch K1, a switch K2, a resistor R, a switch K3, and a capacitor C1, wherein a positive electrode of a battery 101 is connected to a first end of the switch K1 and a first end of the switch K2, a second end of the switch K2 is connected to a first end of the resistor R, a second end of the switch K1 and a second end of the resistor R are connected to a first end of the capacitor C1, a negative electrode of the battery 101 is connected to a first end of the switch K3, a second end of the switch K3 is connected to a second end of the capacitor C1, the reversible PWM rectifier 102 includes a nine-phase bridge arm, the first-phase bridge arm includes a first power switch unit and a second power switch unit connected in series, the second-phase bridge arm includes a third power switch unit and a fourth power switch unit connected in series, the third-phase bridge arm includes a fifth power switch unit and a sixth power switch unit connected in series, the fourth phase bridge arm comprises a seventh power switch unit and an eighth power switch unit which are connected in series, the fifth phase bridge arm comprises a ninth power switch unit and a tenth power switch unit which are connected in series, the sixth phase bridge arm comprises an eleventh power switch unit and a twelfth power switch unit which are connected in series, the seventh phase bridge arm comprises a twenty-first power switch unit and a twenty-second power switch unit which are connected in series, the eighth phase bridge arm comprises a twenty-third power switch unit and a twenty-fourth power switch unit which are connected in series, the ninth phase bridge arm comprises a twenty-fifth power switch unit and a twenty-sixth power switch unit which are connected in series, the input end of the first power switch unit, the input end of the third power switch unit, the input end of the fifth power switch unit, the input end of the seventh power switch unit and the input end of the ninth power switch unit, An input end of an eleventh power switch unit, an input end of a twenty-first power switch unit, an input end of a twenty-third power switch unit, an input end of a twenty-fifth power switch unit, an output end of a second power switch unit, an output end of a fourth power switch unit, an output end of a sixth power switch unit, an output end of an eighth power switch unit, an output end of a tenth power switch unit, an output end of a twelfth power switch unit, an output end of a twenty-second power switch unit, an output end of a twenty-fourth power switch unit, and an output end of a twenty-sixth power switch unit are commonly connected to a second end of a capacitor C2 and form a second sink end, the first power switch unit comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, the second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, the third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, the fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, the fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode VD5, the sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, the seventh power switch unit comprises a seventh upper bridge arm VT7 and a seventh upper bridge diode VD7, the eighth power switch unit comprises an eighth lower bridge arm VT8 and an eighth lower bridge diode VD8, the ninth power switch unit comprises a ninth upper bridge arm VT9 and a ninth upper bridge diode VT9, the tenth power switch unit comprises a tenth lower bridge arm VT10 and a tenth lower bridge diode VD10, the eleventh power switch unit comprises an eleventh upper bridge arm VT11 and an eleventh upper bridge diode VD11, the twelfth power switch unit comprises a twelfth lower bridge arm VT12 and a twelfth lower bridge diode VD12, the twenty-first power switching unit comprises a twenty-first upper bridge arm VT21 and a twenty-first upper bridge diode VD21, the twenty-second power switching unit comprises a twenty-second lower bridge arm VT22 and a twenty-second lower bridge diode VD22, the twenty-third power switching unit comprises a twenty-third upper bridge arm VT23 and a twenty-third upper bridge diode VD23, the twenty-fourth power switching unit comprises a twenty-fourth lower bridge arm VT24 and a twenty-fourth lower bridge diode VD24, the twenty-fifth power switching unit comprises a twenty-fifth upper bridge arm VT25 and a twenty-fifth upper bridge diode VD25, the twenty-sixth power switching unit comprises a twenty-sixth lower bridge arm VT26 and a twenty-sixth lower bridge diode VD26, the first bidirectional bridge arm 141 comprises a thirteenth power switching unit and a fourteenth power switching unit connected in series, the second bidirectional bridge arm 142 comprises a fifteenth power switching unit and a sixteenth power switching unit connected in series, the third bidirectional bridge arm 143 includes a seventeenth power switch unit and an eighteenth power switch unit connected in series, the thirteenth power switch unit includes a thirteenth upper bridge arm VT13 and a thirteenth upper bridge diode VD13, the fourteenth power switch unit includes a fourteenth lower bridge arm VT14 and a fourteenth lower bridge diode VD14, the fifteenth power switch unit includes a fifteenth upper bridge arm VT15 and a fifteenth upper bridge diode VD15, the sixteenth power switch unit includes a sixteenth lower bridge arm VT16 and a sixteenth lower bridge diode VD16, the seventeenth power switch unit includes a seventeenth upper bridge arm VT17 and a seventeenth upper bridge diode VD17, the eighteenth power switch unit includes an eighteenth lower bridge arm VT18 and an eighteenth lower bridge diode 18, an input terminal of the thirteenth power switch unit, an input terminal of the fifteenth power switch unit, and an input terminal of the seventeenth power switch unit are connected to the first current sink, the output end of the fourteenth power switch unit, the output end of the sixteenth power switch unit and the output end of the eighteenth power switch unit are connected with the second bus end, the first winding unit 131 comprises a set of three-phase windings, each phase of winding comprises two coils, a coil U1 and a coil U2 in the first phase of coil are connected with a midpoint U of the fourth phase of bridge arm in a sharing manner, a coil V1 and a coil V2 in the second phase of coil are connected with a midpoint V of the fifth phase of bridge arm in a sharing manner, a coil W1 and a coil W2 in the third phase of coil are connected with a midpoint W of the sixth phase of bridge arm in a sharing manner, a coil U2, a coil V2 and a coil W2 are connected in a sharing manner to form a first connecting point n1, a first connecting point n1 forms a first independent neutral point, a first neutral line is led out from the first independent neutral point, a coil U1, a coil V1 and a coil W1 form a second connecting point n2, a second connecting point n2 forms a second independent neutral point, a second neutral line is led out from the second independent neutral point, the second winding unit 132 comprises a set of three-phase windings, each phase winding comprises two coils, a coil a1 and a coil a2 in the first phase coil are connected to the midpoint a of the first phase bridge arm in a sharing manner, a coil B1 and a coil B2 in the second phase coil are connected to the midpoint B of the second phase bridge arm in a sharing manner, a coil C1 and a coil C2 in the third phase coil are connected to the midpoint C of the third phase bridge arm in a sharing manner, a coil a1, a coil B1 and a coil C1 in a sharing manner form a fourth connection point n4, a fourth connection point n4 in a sharing manner forms a fourth independent neutral point, a fourth neutral line is led out from the fourth independent neutral point, a coil a2, a coil B2 and a coil C2 in a sharing manner form a third connection point n3, a third connection point n3 in a sharing manner forms a third independent neutral point, a third neutral line is led out from the third independent neutral point, the third winding unit 133 comprises a set of three-phase windings, each phase winding comprises two coils, a coil X1 and a coil X2 in the first phase coil in a sharing manner, the coil Y1 and the coil Y2 in the second phase coil are connected to the midpoint Y of the second phase bridge arm in common, the coil Z1 and the coil Z2 in the third phase coil are connected to the midpoint Z of the third phase bridge arm in common, the coil X1, the coil Y1 and the coil Z1 are connected in common to form a fifth connection point n5, the fifth connection point n5 forms a fifth independent neutral point, a fifth neutral line is led out from the fifth independent neutral point, the coil X2, the coil Y2 and the coil Z2 are connected in common to form a sixth connection point n6, the sixth connection point forms a sixth independent neutral point, a sixth neutral line is led out from the sixth independent neutral point, the energy conversion module further comprises a switch K4, a switch K5, a switch K6, a switch K9, a switch K8 and a capacitor C2, a first end of the external direct current port 106 is respectively connected with a first end of the switch K4, a first end of the switch K5, a first end of the switch K6, a first end of the switch K6867, a second end of the switch K4 and a second end of the neutral line of the switch K5, the second end of the switch K6 is connected to the fifth neutral line, the second end of the external dc port 106 is connected to the first end of the switch K8, the second end of the switch K8 is connected to the second end of the capacitor C2 and the second end of the reversible PWM rectifier 102, the energy conversion device further includes a switch K9, a switch K10 and a switch K11, the first end of the external three-phase ac port 108 is connected to the fifth neutral line and the second end of the switch K6 through the switch K9, the second end of the external ac port 108 is connected to the first neutral line and the second end of the switch K5 through the switch K10, and the third end of the external ac port 108 is connected to the third neutral line and the second end of the switch K4 through the switch K11.

When the L-th end of the three-phase junction port 108 is in a positive half period of the power grid voltage (L belongs to {1, 2, 3}), controlling the lower bridge arms of all power switch units connected with the winding units through which the L-th end of the three-phase junction port passes to be synchronously switched on, synchronously switching off the upper bridge arms, reserving dead time, and storing energy in the winding units connected with the L-th end of the three-phase junction port; and controlling the lower bridge arms of all the power switch units connected with the winding units to be synchronously turned off, the upper bridge arms to be synchronously turned on, and the winding units connected with the L-th ends of the three-phase AC ports to store energy and release the energy, so that the electric quantity flows from the L-th ends of the three-phase AC ports to the batteries, flows back to the three-phase AC ports from other bridge arms, and flows back to the power grid from other ports of the three-phase AC ports. For example, when the second end of the three-phase junction connected with the first winding unit is positioned in a positive half period of the grid voltage, the first power switch unit, the third power switch unit and the fifth power switch unit connected with the first winding unit are controlled to be synchronously turned off, the second power switch unit, the fourth power switch unit and the sixth power switch unit are synchronously turned on, dead time is reserved, and energy is stored in the coil of the first winding unit; and controlling the first power switch unit, the third power switch unit and the fifth power switch unit which are connected with the first winding unit to be synchronously switched on, and synchronously switching off the second power switch unit, the fourth power switch unit and the sixth power switch unit to store energy and release the coil of the first winding unit, so that electric energy is transferred to the battery from the power grid.

Further, as an embodiment, as shown in fig. 19, the energy conversion device further includes a pre-charging isolation module, a first end and a second end of the pre-charging isolation module are respectively connected to the positive electrode and the negative electrode of the external battery 101, a third end of the pre-charging isolation module is connected to the pre-charging module, a fourth end and a fifth end of the pre-charging isolation module are respectively connected to the first end of the power switch module 104 and the second end of the dc port 105, and the pre-charging isolation module is further connected to the low-voltage battery charging and discharging module.

The pre-charging isolation module is connected with an external battery 101, and can be used for pre-charging the energy storage module in the reversible PWM rectifier 102 by the external battery 101 and also can be used for charging the energy storage module in the pre-charging isolation module, and the pre-charging of the energy storage module in the reversible PWM rectifier 102 and the pre-charging of the energy storage module in the pre-charging isolation module can be respectively controlled to pre-charge without sequence requirements, and preferably without simultaneous charging; the low-voltage storage battery 101 is charged and discharged by the pre-charging isolation module through the low-voltage storage battery 101 charging and discharging module, and the pre-charging isolation module is further connected between the external battery 101 and the alternating current port 106 to isolate the external battery 101 from the alternating current port 106.

Specifically, a first end and a second end of the first switch module are respectively connected with an anode and a cathode of the external battery 101, a third end and a fourth end of the first switch module are respectively connected with a first end and a second end of the first energy storage module, the first switch module comprises a first switch, a second switch, a resistor and a third switch, the first end of the first switch is connected with the first end of the second switch and forms the first end of the first switch module, the second end of the second switch is connected with the first end of the resistor, the second end of the resistor is connected with the second end of the first switch and forms the third end of the first switch module, the first end of the third switch is the second end of the first switch module, and the second end of the third switch is the fourth end of the first switch module.

This embodiment has increased a branch road, is equipped with second switch and resistance on this branch road, and this branch road is used for realizing that outside battery 101 charges in advance to first energy storage module, switches on the second switch earlier promptly and makes outside battery 101 charge to first energy storage module, owing to set up resistance, can control the electric current size of precharging, controls the second switch disconnection again after first switch switches on after the precharge is accomplished.

The technical effects of the embodiment are as follows: through set up the branch road that is used for carrying on precharging in first switch module, realized exporting the control to the charging current of first energy storage module to outside battery 101, reduce the impact current when the energy storage module is electrified, promoted the safety of charging and the life of first energy storage module of outside battery 101 and first energy storage module in the charging process.

Specifically, the pre-charging isolation module comprises a fourth switch module, a third energy storage device, a first two-phase bridge, a tenth switch device, a transformer and a second two-phase bridge, wherein the first two-phase bridge comprises a first bridge arm and a second bridge arm, the first bridge arm and the second bridge arm are connected in parallel and form a first junction end and a second junction end, the second two-phase bridge comprises a third bridge arm and a fourth bridge arm, and the third bridge arm and the fourth bridge arm are connected in parallel and form a third junction end and a fourth junction end;

a first end and a second end of the fourth switch module are respectively a first end and a second end of the pre-charging isolation module, a third end of the fourth switch module is connected with a first end of the third energy storage device, a first end of the thirteenth switch device and a first bus end of the first two-phase bridge, a fourth end of the fourth switch module is connected with a second end of the third energy storage device and a second bus end of the first two-phase bridge, a midpoint of the first bridge arm and a midpoint of the second bridge arm are respectively connected with a first end and a second end of a first primary coil of the transformer, a first end and a second end of a secondary coil of the transformer are respectively connected with a midpoint of the third bridge arm and a midpoint of the fourth bridge arm, a second end of the tenth switch device is a third end of the pre-charging isolation module, and a third bus end is a fourth end of the pre-charging isolation module, the fourth junction is a fifth end of the pre-charge isolation module.

The energy conversion device also comprises a low-voltage storage battery charging module, and the low-voltage storage battery charging module is connected with the second primary coil of the transformer;

the external battery, the pre-charge isolation module, and the low-voltage secondary battery form a discharge circuit.

As shown in fig. 19, the fourth switch module includes a switch K12 and a switch K14, the first two-phase bridge includes a first bridge arm and a second bridge arm, the first bridge arm includes a fifteenth power switch unit and a sixteenth power switch unit connected in series, the fifteenth power switch unit includes a fifteenth upper bridge arm VT15 and a fifteenth upper bridge diode VD15, the sixteenth power switch unit includes a sixteenth lower bridge arm VT16 and a sixteenth lower bridge diode VD16, the second bridge arm includes a seventeenth power switch unit and an eighteenth power switch unit connected in series, the seventeenth power switch unit includes a seventeenth upper bridge arm VT17 and a seventeenth upper bridge diode VD17, the eighteenth power switch unit includes an eighteenth lower bridge arm VT18 and an eighteenth lower bridge diode VD18, an input end of the fifteenth upper bridge arm VT15 and an input end of the seventeenth upper bridge arm VT17 form a first bus end and are connected to a second end of the capacitor C3, the first bus end is connected with a switch K2 through a switch K13, the first bus end is also connected with the anode of a battery through a switch K12, the output end of a sixteenth lower bridge arm VT16 and the output end of an eighteenth lower bridge diode VD18 form a second bus end and are connected with the second end of a capacitor C3, the second bus end is connected with the cathode of the battery through a switch K14, the output end of a fifteenth upper bridge arm VT15 and the input end of the sixteenth lower bridge arm VT16 are connected as the midpoint of the first bridge arm and are connected with the first end of a primary coil of a transformer through an inductor L3, the output end of a seventeenth upper bridge arm VT17 and the input end of an eighteenth lower bridge arm VT18 are connected as the midpoint of the second bridge arm and are connected with the second end of the primary coil of the transformer through a capacitor C4, the second two-phase bridge comprises a third bridge arm and a fourth bridge arm, the third bridge arm comprises a nineteenth power switch unit and a twentieth power switch unit which are connected in series, the nineteenth upper bridge arm 19 and the nineteenth upper bridge diode VD19, the twentieth power switch unit comprises a twentieth lower bridge arm VT20 and a twentieth lower bridge diode VD20, the fourth bridge arm comprises a twenty-first power switch unit and a twenty-second power switch unit which are connected in series, the twenty-first power switch unit comprises a twenty-first upper bridge arm VT21 and a twenty-first upper bridge diode VD21, the twenty-second power switch unit comprises a twenty-second lower bridge arm VT22 and a twenty-second lower bridge diode VD22, the input end of the nineteenth upper bridge arm VT19 and the input end of the twenty-upper bridge arm VT20 are connected to the first sink end of the reversible PWM rectifier in common, the output end of the nineteenth lower bridge arm VT19 and the output end of the twentieth lower bridge diode VD20 are connected to the first neutral line of the motor coil in common, the output end of the nineteenth upper bridge arm VT19 and the input end of the twenty-lower bridge arm VT20 are connected to the midpoint of the third bridge arm and connected to the first end of the secondary coil of the transformer through an inductor L5, the output end of the twenty-first upper bridge arm VT21 and the input end of the twenty-second lower bridge arm VT22 are connected as the midpoint of the fourth bridge arm and connected with the second end of the secondary coil of the transformer through a capacitor C5.

When the capacitor C1 is charged, the switches K2 and K3 are controlled to be turned on, the switch K1 is turned off, the current output by the external battery forms a pre-charging circuit through the switch K2, the resistor R, the capacitor C1 and the switch K3, the current output by the external battery 101 is pre-charged to the capacitor C1 through the resistor R, the switch K2 is controlled to be turned off after the pre-charging is finished, the switch K1 is controlled to be turned on, and the current output by the external battery forms a charging circuit through the switch K1, the capacitor C1 and the switch K3.

When the capacitor C3 is charged, the switch K13 and the switch K14 are controlled to be switched on, the switch K1, the switch K2 and the switch K3 are switched off, current output by an external battery forms a pre-charging loop through the resistor R, the switch K13, the capacitor C3 and the switch K14, the capacitor C3 is pre-charged, and the low-voltage storage battery F can be charged through the transformer and the low-voltage storage battery charging module after the capacitor C3 is pre-charged.

The technical effects of the embodiment are as follows: through setting the switch K13 in the pre-charging isolation module, the external battery 101 can pre-charge the capacitor C1 in the reversible PWM rectifier 102, and the switch K13 can be controlled to pre-charge the capacitor C3 in the pre-charging isolation module by the external battery 101, so that the external battery 101 charges the low-voltage battery through the pre-charging isolation module, and the isolation between the external battery 101 and the ac port 106 is realized through setting the transformer.

An embodiment of the present invention provides an energy conversion apparatus, as shown in fig. 20, including:

an energy storage connection terminal set 201 comprising a first energy storage connection terminal and a second energy storage connection terminal;

the reversible PWM rectifier 102 includes multiple bridge arms, the multiple bridge arms are connected in parallel to form a first bus end and a second bus end, the first bus end is connected to the first energy storage connection end, and the second bus end is connected to the second energy storage connection end;

a power switch module 104 comprising a first bidirectional leg 141 and a second bidirectional leg 142, the first bidirectional leg 141 comprising a first end, a second end, and a third end, the second bidirectional leg 142 comprising a first end, a second end, and a third end, the first end of the first bidirectional leg 141 and the first end of the second bidirectional leg 142 being commonly connected and connected to the first energy storage connection end and the first bus end, the second end of the first bidirectional leg and the second end of the second bidirectional leg being commonly connected and connected to the second energy storage connection end and the second bus end;

the motor coil 103 comprises a first winding unit 131 and a second winding unit 132, the first winding unit 131 comprises a first group of phase end points, a first neutral line and a second neutral line, the second winding unit 132 comprises a second group of phase end points, a third neutral line and a fourth neutral line, the first group of phase end points and the second group of phase end points are respectively connected with the multiple bridge arms, one phase end point is connected with the middle point of one bridge arm, the second neutral line of the first winding unit is connected with the third end of the first bidirectional bridge arm, and the fourth neutral line of the second winding unit is connected with the third end of the second bidirectional bridge arm;

a charging or discharging connection set 202 comprising a first charging or discharging connection terminal connecting the first neutral line and the third neutral line and a second charging or discharging connection terminal connecting the second energy storage connection terminal, the second bus bar terminal and the second terminal of the power switch module.

The energy storage connection terminal set 201 is used to connect to an external battery, and the charging or discharging connection terminal set 202 is used to connect to an external charging port.

An embodiment of the present invention provides an energy conversion apparatus, as shown in fig. 21, including:

a power switch module 104 comprising a first bidirectional leg 141, a second bidirectional leg 142, and a third bidirectional leg 143, said first bidirectional leg 141 comprising a first end, a second end, and a third end, said second bidirectional leg 142 comprising a first end, a second end, and a third end, said third bidirectional leg 143 comprising a first end, a second end, and a third end, said first end of said first bidirectional leg 141, said first end of said second bidirectional leg 142, and said first end of said third bidirectional leg 143 being commonly connected to connect said first energy storage connection terminal and said first bus terminal, said second end of said first bidirectional leg 141, said second end of said second bidirectional leg 142, and said second end of said third bidirectional leg 143 being commonly connected to connect said second energy storage connection terminal and said second bus terminal;

a motor coil 103 including a first winding unit 131, a second winding unit 132, and a third winding unit 133, the first winding element 131 comprises a first set of phase terminals, a first neutral and a second neutral, the second winding element 132 includes a second set of phase terminals, a third neutral and a fourth neutral, the third winding unit 133 includes a third group of phase terminals, a fifth neutral line and a sixth neutral line, the first group of phase end points, the second group of phase end points and the third group of phase end points are respectively connected with the multiple bridge arms, one phase end point is connected with the middle point of one bridge arm, the second neutral line of first winding unit 131 is connected to the third end of the first bidirectional bridge arm, the fourth neutral line of the second winding unit 132 is connected to the third end of the second bidirectional bridge arm, a sixth neutral line of the third winding unit 133 is connected to the third end of the third bidirectional leg;

and the charging or discharging connection end group 202 comprises a first charging or discharging connection end and a second charging or discharging connection end, the first charging or discharging connection end is connected with the first neutral line, the third neutral line and the fifth neutral line, and the second charging or discharging connection end is connected with the second energy storage connection end, the second bus end, the second end of the first bidirectional bridge arm, the second end of the second bidirectional bridge arm and the second end of the third bidirectional bridge arm.

An embodiment of the present application provides a vehicle, which further includes the energy conversion device provided in any one of the first to fourth embodiments.

As shown in fig. 22, the heating and cooling circuit of the battery pack includes the following circuits: a motor drive system cooling loop, a battery cooling system loop, and an air conditioning system cooling loop. The battery cooling system loop is fused with the air-conditioning cooling system through the heat exchange plate; and the battery cooling system loop is communicated with the motor driving system cooling loop through the four-way valve. The motor drive system cooling circuit connects and disconnects the radiator by switching of the three-way valve. The motor driving system cooling loop and the battery cooling system loop are switched through the valve body, the flow direction of cooling liquid in the pipeline is changed, the flow direction of the cooling liquid heated by the motor driving system is enabled to flow to the battery cooling system, and heat is transferred from the motor driving system to the battery cooling; when the motor driving system is in a non-heating mode, the cooling liquid of the motor driving system flows through a loop A and the cooling liquid of the battery cooling system flows through a loop C by switching the three-way valve and the four-way valve; the motor is in a heating mode, the cooling liquid of the motor driving system flows through a loop B by switching the three-way valve and the four-way valve, and the purpose that the cooling liquid heated by the motor driving system flows to the battery pack cooling loop to heat the battery is achieved.

The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. An energy conversion device is characterized by comprising a reversible PWM rectifier, a motor coil and a power switch module, the power switching module includes a first bidirectional leg and a second bidirectional leg, the reversible PWM rectifier, the first bidirectional leg, and the second bidirectional leg are connected in parallel, part of the coil branches or all the coil branches of the motor coil at least form a first winding unit and a second winding unit, the reversible PWM rectifier further connects the first winding unit and the second winding unit, the first winding unit is also led out of a first neutral wire and a second neutral wire, the second winding unit is also led out of a third neutral wire and a fourth neutral wire, a second neutral line of the first winding unit is connected with the first bidirectional bridge arm, and a fourth neutral line of the second winding unit is connected with the second bidirectional bridge arm;

an external direct current port forms a direct current charging circuit or a direct current discharging circuit with an external battery through the energy conversion device, and the external battery forms a driving loop with the reversible PWM rectifier and the motor coil in the energy conversion device; the first neutral line of the first winding unit, the third neutral line of the second winding unit, the first bidirectional bridge arm, the second bidirectional bridge arm and the reversible PWM rectifier are respectively connected with an external direct current port, and the reversible PWM rectifier, the first bidirectional bridge arm and the second bidirectional bridge arm are respectively connected with an external battery.

2. The energy conversion device according to claim 1, further comprising a first switch module, wherein the third neutral wire of the second winding unit connects the first winding unit and the external dc port through the first switch module.

3. The energy conversion device according to claim 1, wherein an external dc port forms a first dc charging circuit or a first dc discharging circuit with an external battery through the first winding unit and the first bidirectional leg in the energy conversion device;

an external direct current port forms a second direct current charging circuit or a second direct current discharging circuit with an external battery through the second winding unit and the second bidirectional bridge arm in the energy conversion device.

4. The energy conversion device according to claim 3, wherein when a dc power supply device is connected to the external dc port, the dc power supply device, the first winding unit, and the first bidirectional arm form a first dc charging energy storage loop, the dc power supply device, the first winding unit, the first bidirectional arm, and the external battery form a first dc charging follow current loop, the dc power supply device, the second winding unit, and the second bidirectional arm form a second dc charging energy storage loop, and the dc power supply device, the second winding unit, the second bidirectional arm, and the external battery form a second dc charging follow current loop;

or, when the external dc port is connected to a dc power consumption device, the external battery, the first bidirectional arm, the first winding unit, and the dc power consumption device form a first dc discharge energy storage loop, and the first bidirectional arm, the first winding unit, and the dc power consumption device form a first dc discharge follow current loop; the external battery, the second bidirectional bridge arm, the second winding unit and the direct-current electric equipment form a second direct-current discharging energy storage loop, and the second bidirectional bridge arm, the second winding unit and the direct-current electric equipment form a second direct-current discharging follow current loop.

5. The energy conversion device according to claim 1, wherein when an external dc port is connected to a dc power supply device, the dc power supply device forms a first dc charging circuit with an external battery through the first winding unit and the first bidirectional leg in the energy conversion device;

the direct current power supply equipment forms a second direct current charging circuit with an external battery through the second winding unit and the second bidirectional bridge arm in the energy conversion device;

the direct current power supply equipment forms a third direct current charging circuit with an external battery through the first winding unit in the energy conversion device, the reversible PWM rectifier and the external battery;

the direct current power supply equipment forms a fourth direct current charging circuit with an external battery through the second winding unit in the energy conversion device, the reversible PWM rectifier and the external battery;

the energy conversion device selects any one of the first direct current charging circuit, the second direct current charging circuit, the third direct current charging circuit and the fourth direct current charging circuit to work according to an external control signal;

or, the energy conversion device selects any one of the first direct current charging circuit and the second direct current charging circuit, the first direct current charging circuit and the fourth direct current charging circuit, the second direct current charging circuit and the third direct current charging circuit, and the third direct current charging circuit and the fourth direct current charging circuit to work simultaneously according to an external control signal.

6. The energy conversion device according to claim 5, wherein the energy conversion device controls any one of the first DC charging circuit and the second DC charging circuit, the first DC charging circuit and the fourth DC charging circuit, the second DC charging circuit and the third DC charging circuit, the third DC charging circuit and the fourth DC charging circuit to operate simultaneously according to the phase error of the external control signal.

7. The energy conversion device according to claim 1, wherein when an external dc port is connected to a dc power consuming device, the external battery forms a first dc discharge circuit with the dc power consuming device through the first bidirectional arm, the first winding unit, and the first winding unit in the energy conversion device;

the external battery forms a second direct-current discharge circuit through the second bidirectional bridge arm, the second winding unit and the direct-current electric equipment in the energy conversion device;

the external battery forms a third direct current discharge circuit through a reversible PWM rectifier in the energy conversion device, the first winding unit and the direct current electric equipment;

the external battery forms a fourth direct current discharge circuit through a reversible PWM rectifier in the energy conversion device, the second winding unit and the direct current electric equipment;

the energy conversion device selects any one of the first direct current discharge circuit, the second direct current discharge circuit, the third direct current discharge circuit and the fourth direct current discharge circuit to work according to an external control signal;

or, the energy conversion device selects any one group of the first direct current discharge circuit and the second direct current discharge circuit, the first direct current discharge circuit and the fourth direct current discharge circuit, the second direct current discharge circuit and the third direct current discharge circuit, and the third direct current discharge circuit and the fourth direct current discharge circuit to work simultaneously according to an external control signal.

8. The energy conversion device according to claim 7, wherein the energy conversion device controls any one of the first and second dc discharge circuits, the first and fourth dc discharge circuits, the second and third dc discharge circuits, the third and fourth dc discharge circuits to operate simultaneously according to an external control signal.

9. The energy conversion device according to claim 2, wherein when the first switch module is in the off state, an external ac port forms an ac charging circuit or an ac discharging circuit with an external battery through the energy conversion device, and wherein the first neutral line of the first winding unit and the third neutral line of the second winding unit are respectively connected to the external ac port.

10. The energy conversion device of claim 9, wherein an external ac port forms an ac charging circuit or an ac discharging circuit through the first winding unit, the first bidirectional leg, the second winding unit, the second bidirectional leg, and an external battery in the energy conversion device.

11. The energy conversion device according to claim 10, wherein when an ac power supply device is connected to the external ac port, the ac power supply device, the second winding unit, the second bidirectional arm, the first winding unit, and the first bidirectional arm form an ac charging energy storage loop, and the ac power supply device, the second winding unit, the second bidirectional arm, the external battery, the first bidirectional arm, and the first winding unit form an ac charging energy storage release loop.

12. The energy conversion device of claim 9, wherein an external dc port forms a heating circuit with an external battery through the energy conversion device;

or an external alternating current port forms a heating circuit with an external battery through the energy conversion device;

or an external battery and an external direct current port form a heating circuit through the energy conversion device;

alternatively, an external battery forms a heating circuit with an external ac port via the energy conversion device.

13. The energy conversion device of claim 12, wherein said reversible PWM rectifier causes said DC charging circuit and said heating circuit to cooperate in accordance with an external control signal, or the drive circuit and the heating circuit are cooperatively operated, or the DC charging circuit, the heating circuit and the drive circuit are cooperatively operated, or the DC discharge circuit and the heating circuit are cooperated to work, or the DC discharge circuit, the heating circuit and the driving circuit are cooperated to work, or the alternating current charging circuit and the heating circuit are caused to cooperate, or the alternating current charging circuit, the heating circuit and the drive circuit are caused to cooperate, or causing the ac discharge circuit and the heating circuit to cooperate, or causing the ac discharge circuit, the heating circuit, and the drive circuit to cooperate.

14. The energy conversion device of claim 9, wherein the reversible PWM rectifier comprises M₁A road bridge arm;

the first winding unit comprises a set of m₁A phase winding of m₁Each of the phase windings includes n₁A coil branch of n for each phase winding₁The coil branches are connected together to form a phase terminal point, m₁Phase end point of phase winding and M₁M in road bridge arm₁The middle points of each path of bridge arm of the path bridge arms are connected in a one-to-one correspondence manner, and m is₁N of each of the phase windings₁One of the coil branches is also respectively connected with n of other phase windings₁One of the coil branches is connected to form n₁A connection point, said n₁A connection point forming T₁A neutral point, said T₁Each neutral point leads out a first neutral line and a second neutral line, where n₁≥2，m₁≥1，T₁N is not less than 2 and₁，m₁，T₁are all integers;

the second winding unit comprises a set of m₂A phase winding of m₂Each of the phase windings includes n₂A coil branch of n for each phase winding₂The coil branches are connected together to form a phase terminal point, m₂Phase end point of phase winding and M₁M in road bridge arm₂The middle points of each path of bridge arm of the path bridge arms are connected in a one-to-one correspondence manner, and m is₂N of each of the phase windings₂One of the coil branches is also respectively connected with n of other phase windings₂One of the coil branches is connected to form n₂A connection point, said n₂A connection point forming T₂A neutral point, said T₂Each neutral point leads out a third neutral line and a fourth neutral line, where n₂≥2，m₂≥1，M₁≥m₁+m₂，T₂N is not less than 2₂，m₂，M₁，T₂Are all integers.

15. The energy conversion device of claim 14, wherein the first neutral line connects the first end of the external dc port, the first end of the external ac port, and the first end of the first switch module, the second neutral line connects the power switch module, the third neutral line connects the second end of the switch module and the second end of the external ac port, and the fourth neutral line connects the power switch module.

16. The energy conversion device of claim 15, wherein when m is₁＝m₂＝3，M₁＝6，n₁When 2, the first winding unit forms 2 connection points, and the 2 connection points lead out a first neutral line and a second neutral line respectively, soThe second winding unit forms 2 connection points, and the 2 connection points lead out a third neutral line and a fourth neutral line respectively.

17. The energy conversion device of claim 15, wherein when m is₁＝m₂＝3，M₁＝9，n₁When the number of the connection points is 4, the first winding unit forms 4 connection points, 2 of the 4 connection points lead out a first neutral line and a second neutral line respectively, the second winding unit forms 4 connection points, and 2 of the 4 connection points lead out a third neutral line and a fourth neutral line respectively.

18. The energy conversion device of claim 14, wherein the reversible PWM rectifier comprises M₁A first bus end and M formed by connecting the first ends of each of the road bridge arms together₁The second ends of each of the road bridge arms are connected together to form a second junction end;

the first end of the first bidirectional bridge arm is connected with the first end of the second bidirectional bridge arm, the positive end of the external battery and the first bus end, the second end of the first bidirectional bridge arm is connected with the second end of the second bidirectional bridge arm, the negative end of the external battery and the second bus end, the third end of the first bidirectional bridge arm is connected with the second neutral line, and the third end of the second bidirectional bridge arm is connected with the fourth neutral line.

19. The energy conversion device according to claim 18, wherein the first bidirectional leg comprises a thirteenth power switch unit and a fourteenth power switch unit, an input end of the thirteenth power switch unit is a first end of the power switch module, an output end of the fourteenth power switch unit is a second end of the power switch module, and an output end of the thirteenth power switch unit is connected with an input end of the fourteenth power switch unit in common and forms a third end of the power switch module;

the second bidirectional bridge arm comprises a fifteenth power switch unit and a sixteenth power switch unit, wherein the input end of the fifteenth power switch unit is the first end of the power switch module, the output end of the sixteenth power switch unit is the second end of the power switch module, and the output end of the fifteenth power switch unit and the input end of the sixteenth power switch unit are connected in common to form a third end of the power switch module.

20. An energy conversion device is characterized by comprising a reversible PWM rectifier, a motor coil and a power switch module, the power switch module includes a first bidirectional leg, a second bidirectional leg, and a third bidirectional leg, the reversible PWM rectifier, the first bidirectional leg, the second bidirectional leg, and the third bidirectional leg are connected in parallel, the motor coil comprises a first winding unit, a second winding unit and a third winding unit, a first neutral wire and a second neutral wire are led out of the first winding unit, a third neutral wire and a fourth neutral wire are led out of the second winding unit, a fifth neutral wire and a sixth neutral wire are led out of the third winding unit, a second neutral line of the first winding unit is connected with the first bidirectional bridge arm, a fourth neutral line of the second winding unit is connected with the second bidirectional bridge arm, and a sixth neutral line of the third winding unit is connected with the third bidirectional bridge arm;

an external direct current port forms a direct current charging circuit or a direct current discharging circuit with an external battery through the energy conversion device, and the external battery forms a driving loop with the reversible PWM rectifier and the motor coil in the energy conversion device; the first neutral line of the first winding unit, the third neutral line of the second winding unit, the fifth neutral line of the third winding unit, the first bidirectional bridge arm, the second bidirectional bridge arm, the third bidirectional bridge arm and the reversible PWM rectifier are respectively connected with an external direct current port, and the reversible PWM rectifier, the first bidirectional bridge arm, the second bidirectional bridge arm and the third bidirectional bridge arm are respectively connected with an external battery.

21. The energy conversion device of claim 20, wherein the multi-phase legs of the reversible PWM rectifier are connected in parallel to form a first bus terminal and a second bus terminal, and wherein the first bidirectional leg, the second bidirectional leg, and the third bidirectional leg are connected in parallel to form a third bus terminal and a fourth bus terminal;

the second neutral line is connected with a midpoint of the first bidirectional bridge arm, the first neutral line is connected with a first end of the external direct current port, the fourth neutral line is connected with a midpoint of the second bidirectional bridge arm, the third neutral line is connected with a first end of the external direct current port, the sixth neutral line is connected with a midpoint of the third bidirectional bridge arm, the fifth neutral line is connected with a first end of the external direct current port, the third confluence end is connected with the first confluence end, and the fourth confluence end is connected with the second confluence end and a second end of the external direct current port.

22. The energy conversion device of claim 21, wherein an external ac port connects said first neutral conductor, said third neutral conductor, and said fifth neutral conductor.

23. The energy conversion device of claim 22, wherein the reversible PWM rectifier comprises M₁A road bridge arm;

the first winding unit comprises a set of m₁A phase winding of m₁Each of the phase windings includes n₁A coil branch of n for each phase winding₁The coil branches are connected together to form a phase terminal point, m₁Phase end point of phase winding and M₁M in road bridge arm₁The middle points of each path of bridge arm of the path bridge arms are connected in a one-to-one correspondence manner, and m is₁N of each of the phase windings₁One of the coil branches is also respectively connected with n of other phase windings₁One of the coil branches is connected to form n₁A connection point, said n₁A connection point forming T₁A neutral point, thereforT is₁Each neutral point leads out a first neutral line and a second neutral line, where n₁≥2，m₁≥1，T₁N is not less than 2 and₁，m₁，T₁are all integers;

the second winding unit comprises a set of m₂A phase winding of m₂Each of the phase windings includes n₂A coil branch of n for each phase winding₂The coil branches are connected together to form a phase terminal point, m₂Phase end point of phase winding and M₁M in road bridge arm₂The middle points of each path of bridge arm of the path bridge arms are connected in a one-to-one correspondence manner, and m is₂N of each of the phase windings₂One of the coil branches is also respectively connected with n of other phase windings₂One of the coil branches is connected to form n₂A connection point, said n₂A connection point forming T₂A neutral point, said T₂Each neutral point leads out a third neutral line and a fourth neutral line, where n₂≥2，m₂≥1，T₂N is not less than 2₂，m₂，T₂Are all integers;

the third winding unit comprises a set of m₃A phase winding of m₃Each of the phase windings includes n₃A coil branch of n for each phase winding₃The coil branches are connected together to form a phase terminal point, m₃Phase end point of phase winding and M₁M in road bridge arm₃The middle points of each path of bridge arm of the path bridge arms are connected in a one-to-one correspondence manner, and m is₃N of each of the phase windings₃One of the coil branches is also respectively connected with n of other phase windings₃One of the coil branches is connected to form n₃A connection point, said n₃A connection point forming T₃A neutral point, said T₃Each neutral point leads out a fifth neutral line and a sixth neutral line, where n₃≥2，m₃≥1，T₃≥2，M₁≥m₁+m₂+m₃And n is₃，m₃，T₃，M₃Are all integers.

24. The energy conversion device according to claim 23, further comprising a first switching module and a first energy storage module, wherein the first switching module comprises a first switching device and a pre-charging module, the first energy storage module is connected in parallel with the reversible PWM rectifier, and the external battery is connected to the first energy storage module through the first switching device in the first switching module and the pre-charging module.

25. The energy conversion device according to claim 24, further comprising a pre-charging isolation module, wherein the first terminal and the second terminal of the pre-charging isolation module are respectively connected to the positive electrode and the negative electrode of the external battery, the third terminal of the pre-charging isolation module is connected to the pre-charging module, and the fourth terminal and the fifth terminal of the pre-charging isolation module are respectively connected to the first terminal of the power switch module and the first terminal of the external dc port.

26. The energy conversion apparatus according to claim 25, wherein the pre-charge isolation module comprises a fourth switching module, a third energy storage device, a first two-phase bridge, a tenth switching device, a transformer, and a second two-phase bridge, wherein the first two-phase bridge comprises a first leg and a second leg, the first leg and the second leg are connected in parallel and form a first junction and a second junction, the second two-phase bridge comprises a third leg and a fourth leg, and the third leg and the fourth leg are connected in parallel and form a third junction and a fourth junction;

27. The energy conversion device of claim 26, further comprising a low voltage battery charging module coupled to the second primary winding of the transformer;

the external battery, the pre-charge isolation module, and the low-voltage secondary battery form a charging circuit or a discharging circuit.

28. An energy conversion device, comprising:

an energy storage connection terminal set comprising a first energy storage connection terminal and a second energy storage connection terminal;

the reversible PWM rectifier comprises a plurality of bridge arms, the plurality of bridge arms are connected in parallel to form a first bus end and a second bus end, the first bus end is connected with the first energy storage connecting end, and the second bus end is connected with the second energy storage connecting end;

a power switch module, which includes a first bidirectional bridge arm and a second bidirectional bridge arm, wherein the first bidirectional bridge arm includes a first end, a second end and a third end, the second bidirectional bridge arm includes a first end, a second end and a third end, the first end of the first bidirectional bridge arm and the first end of the second bidirectional bridge arm are connected in common and are connected to the first energy storage connection end and the first bus end, and the second end of the first bidirectional bridge arm and the second end of the second bidirectional bridge arm are connected in common and are connected to the second energy storage connection end and the second bus end;

the motor coil comprises a first winding unit and a second winding unit, the first winding unit comprises a first group of phase end points, a first neutral line and a second neutral line, the second winding unit comprises a second group of phase end points, a third neutral line and a fourth neutral line, the first group of phase end points and the second group of phase end points are respectively connected with the multiple bridge arms, one phase end point is connected with the middle point of one bridge arm, the second neutral line of the first winding unit is connected with the third end of the first bidirectional bridge arm, and the fourth neutral line of the second winding unit is connected with the third end of the second bidirectional bridge arm;

and the charging or discharging connection end group comprises a first charging or discharging connection end and a second charging or discharging connection end, the first charging or discharging connection end is connected with the first neutral line and the third neutral line, and the second charging or discharging connection end is connected with the second energy storage connection end, the second bus bar end and the second end of the power switch module.

29. An energy conversion device, comprising:

a power switch module, which includes a first bidirectional bridge arm, a second bidirectional bridge arm, and a third bidirectional bridge arm, where the first bidirectional bridge arm includes a first end, a second end, and a third end, the second bidirectional bridge arm includes a first end, a second end, and a third end, the third bidirectional bridge arm includes a first end, a second end, and a third end, the first end of the first bidirectional bridge arm, the first end of the second bidirectional bridge arm, and the first end of the third bidirectional bridge arm are all connected to connect the first energy storage connection end and the first bus end, and the second end of the first bidirectional bridge arm, the second end of the second bidirectional bridge arm, and the second end of the third bidirectional bridge arm are all connected to connect the second energy storage connection end and the second bus end;

a motor coil including a first winding unit including a first set of phase end points, a first neutral line and a second neutral line, the second winding unit comprising a second set of phase end points, a third neutral line and a fourth neutral line, the third winding unit comprising a third set of phase end points, a fifth neutral line and a sixth neutral line, the first group of phase end points, the second group of phase end points and the third group of phase end points are respectively connected with the multiple bridge arms, one phase end point is connected with the middle point of one bridge arm, a second neutral line of the first winding unit is connected with a third end of the first bidirectional bridge arm, a fourth neutral line of the second winding unit is connected with a third end of the second bidirectional bridge arm, and a sixth neutral line of the third winding unit is connected with a third end of the third bidirectional bridge arm;

and the charging or discharging connection end group comprises a first charging or discharging connection end and a second charging or discharging connection end, the first charging or discharging connection end is connected with the first neutral line, the third neutral line and the fifth neutral line, and the second charging or discharging connection end is connected with the second energy storage connection end, the second junction end, the second end of the first bidirectional bridge arm, the second end of the second bidirectional bridge arm and the second end of the third bidirectional bridge arm.

30. A vehicle characterized by further comprising an energy conversion device according to any one of claims 1 to 29.