CN112389227B

CN112389227B - Energy conversion device and vehicle

Info

Publication number: CN112389227B
Application number: CN201910755869.XA
Authority: CN
Inventors: 李吉成; 雷野; 谢飞跃; 张宇昕; 杨宁
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: CN112389227A

Abstract

The application provides an energy conversion device and vehicle, energy conversion device includes: the first end and the second end of each bridge arm of the reversible PWM rectifier are respectively connected in common to form a first bus end and a second bus end; a motor coil including a first winding unit and a second winding unit connected with the reversible PWM rectifier; a bidirectional bridge arm connected in parallel with the reversible PWM rectifier; when the device is applied to a vehicle, the alternating current charging and discharging circuit and the driving circuit can both multiplex the reversible PWM rectifier and the motor coil, and the problems of complex structure, low integration level, large size and high cost of the existing overall control circuit comprising the battery charging circuit and the motor driving circuit are solved.

Description

Energy conversion device and vehicle

Technical Field

The application belongs to the technical field of electronics, especially relates to an energy conversion device and 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 charging 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

The embodiment of the application provides an energy conversion device and a vehicle thereof, which can discharge electric equipment and receive the charge of power supply equipment.

The present application is achieved as an energy conversion apparatus, comprising:

the first ends of the bridge arms of the reversible PWM rectifier are connected together to form a first bus end, and the second ends of the bridge arms of the reversible PWM rectifier are connected together to form a second bus end;

the motor coil comprises a first winding unit and a second winding unit, and the reversible PWM rectifier is respectively connected with the first winding unit and the second winding unit;

a bidirectional bridge arm connected in parallel with the reversible PWM rectifier;

the charging and discharging connection end group comprises a first charging and discharging connection end, a second charging and discharging connection end and a third charging and discharging connection end, the first charging and discharging connection end is connected with the midpoint of the bidirectional bridge arm, the second charging and discharging connection end is connected with the first winding unit, and the third charging and discharging connection end is connected with the second winding unit;

the first end of the external alternating current port is connected with the first charging and discharging connection end, and the second end of the alternating current port is connected with the second charging and discharging connection end.

The present application further provides another object to provide a vehicle including the above energy conversion apparatus.

The application provides an energy conversion device and a vehicle, the energy conversion device comprises a reversible PWM rectifier, a motor coil, a bidirectional bridge arm and a charging and discharging connection end group, the energy conversion device can work in a driving mode, a heating mode, an alternating current charging mode and a discharging mode after being connected with an external alternating current port and an external battery, when the energy conversion device is in the driving mode, the external battery, the reversible PWM rectifier and the motor coil form a driving loop, when the energy conversion device is in the heating mode, the external battery, the reversible PWM rectifier and the motor coil form a heating loop, when the energy conversion device is in the alternating current charging mode, the external alternating current port forms an alternating current charging circuit with the external battery through the energy conversion device, when the energy conversion device is in the alternating current discharging mode, an external battery forms an alternating current discharging circuit with an external alternating current port through an energy conversion device, the output power of a motor is driven through a driving loop, the external battery is discharged or charged through an alternating current discharging circuit or an alternating current charging circuit, the charging of alternating current power supply equipment is received when the external battery power is insufficient, the charging is carried out on the alternating current power equipment when the external battery power is sufficient, and the reversible PWM rectifier and the motor are adopted in the driving loop, the heating loop, the direct current charging loop and the direct current discharging loop, so that the circuit structure is simplified, the integration level is also improved, 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 overall control circuit comprising the battery charging circuit and the motor driving circuit are solved.

Drawings

FIG. 1 is a schematic block diagram of an apparatus according to a first embodiment of the present disclosure;

FIG. 2 is a schematic block diagram of an apparatus according to the first embodiment of the present application;

FIG. 3 is a schematic block diagram of an apparatus according to a second embodiment of the present application;

FIG. 4 is a schematic diagram of another module structure of the apparatus according to the second embodiment of the present application;

FIG. 5 is a block diagram of an apparatus according to a third embodiment of the present disclosure;

FIG. 6 is a schematic diagram of another module structure of the apparatus according to the third embodiment of the present application;

FIG. 7 is a block diagram of an apparatus according to a fourth embodiment of the present disclosure;

FIG. 8 is a schematic diagram of another module structure of the apparatus according to the fourth embodiment of the present application;

FIG. 9 is a schematic block diagram of an apparatus according to a fourth embodiment of the present application;

FIG. 10 is a diagram illustrating a circuit structure of a device according to a fifth embodiment of the present application;

FIG. 11 is a schematic current flow diagram of an apparatus according to a fifth embodiment of the present application;

FIG. 12 is a schematic view of another current flow of the apparatus provided in the fifth embodiment of the present application;

FIG. 13 is a schematic illustration of a further current flow for an apparatus according to a fifth embodiment of the present application;

FIG. 14 is a schematic view of another current flow of the apparatus provided in the fifth embodiment of the present application;

FIG. 15 is a schematic illustration of yet another current flow for an apparatus according to a fifth embodiment of the present application;

FIG. 16 is a schematic illustration of yet another current flow for an apparatus according to a fifth embodiment of the present application;

FIG. 17 is a schematic illustration of yet another current flow for an apparatus according to a fifth embodiment of the present application;

FIG. 18 is a schematic view of another current flow direction of the device according to the fifth embodiment of the present application;

FIG. 19 is a diagram illustrating another exemplary circuit configuration of an apparatus according to a fifth embodiment of the present application;

FIG. 20 is a diagram illustrating another exemplary circuit structure of an apparatus according to a fifth embodiment of the present application;

FIG. 21 is a diagram illustrating another exemplary circuit structure of an apparatus according to a fifth embodiment of the present application;

FIG. 22 is a diagram illustrating a circuit structure of an apparatus according to a sixth embodiment of the present application;

FIG. 23 is a diagram illustrating another exemplary circuit configuration of an apparatus according to a sixth embodiment of the present application;

FIG. 24 is a diagram illustrating another exemplary circuit configuration of an apparatus according to a sixth embodiment of the present application;

FIG. 25 is a diagram illustrating another exemplary circuit configuration of an apparatus according to a sixth embodiment of the present application;

FIG. 26 is a diagram illustrating another exemplary circuit configuration of an apparatus according to a sixth embodiment of the present application;

FIG. 27 is a diagram illustrating another exemplary circuit configuration of an apparatus according to a sixth embodiment of the present application;

FIG. 28 is a diagram illustrating a circuit configuration of an apparatus according to a seventh embodiment of the present application;

FIG. 29 is a diagram illustrating another exemplary circuit configuration of an apparatus according to a seventh embodiment of the present application;

fig. 30 is a schematic block diagram of a vehicle according to an eighth 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.

An embodiment of the present application provides an energy conversion device, as shown in fig. 1, including a reversible PWM rectifier 11, a motor coil 12, a bidirectional bridge arm 13, and a charge/discharge connection terminal group 14.

Specifically, the first terminals of the respective legs of the reversible PWM rectifier 11 are connected together to form a first bus terminal, the second ends of the respective legs of the reversible PWM rectifier 11 are connected together to form a second bus terminal, the motor coil 12 includes a first winding unit N1 and a second winding unit N2, the reversible PWM rectifier 11 is respectively connected with the first winding unit N1 and the second winding unit N2, the bidirectional bridge arm 13 is connected with the reversible PWM rectifier in parallel, the charge-discharge connection end group 14 comprises a first charge-discharge connection end 141, a second charge-discharge connection end 142 and a third charge-discharge connection end 143, the first charge-discharge connection end 141 is connected with the midpoint of the bidirectional bridge arm 13, the second charge-discharge connection end 142 is connected with the first winding unit N1, the third charge-discharge connection end 143 is connected with the second winding unit N2, the first end of the external alternating current port 3 is connected with the first charge-discharge connection end 141, and the second end of the alternating current port 3 is connected with the second charge-discharge connection end 142.

It should be noted that "charge and discharge" in this embodiment refers to "charge" or "discharge", and therefore, the "charge and discharge connection terminal group" may be the "charge connection terminal group", or may be the "discharge connection terminal group", and the "charge and discharge circuit" may be the "charge circuit", or may be the "discharge circuit".

In some examples, the third charge/discharge connection terminal 143 may be connected to the second terminal of the ac port 3, or may be connected to the external dc port 4, and the external ac port 3 and the external dc port 4 may be connected to the second winding unit N2 through the third charge/discharge connection terminal 143, which is not limited herein.

The reversible PWM rectifier 11 can invert the current input from the external battery 2 or rectify the current output to the external battery according to the PWM control signal, the reversible PWM rectifier 11 comprises a multiphase bridge arm, the number of the bridge arms is configured according to the phase number of the motor coil 12, each phase of the inverter bridge arm comprises two power switch units, the power switch units can be of the types of transistors, IGBTs, MOS (metal oxide semiconductor) transistors, SiC and the like, 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 11 can be switched on and off according to the external control signal; the bidirectional bridge arm 13 comprises two power switches, the bidirectional bridge arm 13 can realize the conduction of different loops in the energy conversion device according to the control signal, and the bidirectional bridge arm 13 can be matched with each bridge arm in the reversible PWM rectifier to convert alternating current into direct current.

The midpoint of the bidirectional arm 13 refers to a point on a connection line of two power switches connected in series in the bidirectional arm 13, and the first charge/discharge connection terminal 141 is simultaneously connected to the two power switches in the bidirectional arm 13 through the point.

The first charge-discharge connection end 141 is an end point on a connection line led out from a midpoint of the bidirectional bridge arm 13, so that when the first charge-discharge connection end 141 is connected with an electric device or a power supply device, the electric device or the power supply device can be connected with the midpoint of the bidirectional bridge arm through the point, and meanwhile, the principles of the second charge-discharge connection end 142 and the third charge-discharge connection end 143 are the same as those of the first charge-discharge connection end, which is not described herein again.

It should be noted that switches may be disposed between the first charge/discharge port 141 and the midpoint of the bidirectional arm 13, between the second charge/discharge connection end 142 and the first winding unit N1, and between the third charge/discharge connection end 143 and the second winding unit N2, for controlling conduction states between the first charge/discharge port 141 and the midpoint of the bidirectional arm 13, between the second charge/discharge connection end 142 and the first winding unit N1, and between the third charge/discharge connection end 143 and the second winding unit N2.

In addition, in the present embodiment, an ac power supply apparatus or an ac electric apparatus can be connected through the ac port 3, ac power input from the ac power supply apparatus can be supplied to the energy conversion device through the ac port 3 by being connected to the ac power supply apparatus, and ac power output from the energy conversion device can be supplied to the ac electric apparatus through the ac port 3 by being connected to the ac electric apparatus.

In addition, in some examples, a contactor switch may be further disposed between the battery 2 and the motor coil 12, and when the contactor switch is closed, the battery 2, the reversible PWM rectifier 11, and the motor coil 12 may form a driving circuit.

Wherein the motor coil 12 comprises at least two sets of winding units, each set of m_xEach phase winding is used as a basic unit, the motor vector control adopted by each basic unit can independently control the motor to operate, and m_x≥2。

The first winding unit N1 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 is₁Each phase in the phase windingN of the winding₁One 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 from n₁In one connection point form T₁A neutral point, from T₁Neutral point lead-out J₁A neutral line of m wherein₁≥2，n₁≥T₁≥1，T₁≥J₁N is not less than 1₁，m₁，T₁，J₁Are all positive integers.

The second winding element N2 comprises 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 from n₂In one connection point form T₂A neutral point, from T₂Neutral point lead-out J₂A neutral line of m wherein₂≥2，M₁≥m₁+m₂，n₂≥T₂≥1，T₂≥J₂N is not less than 1₂，m₂，T₂，M₁，J₂Are all positive integers.

J₁The neutral line is connected with the second charge-discharge connection end 142, J₂The neutral line is connected to the third charge/discharge connection terminal 143.

The motor coil 12 includes at least two winding units, each winding unit includes a multi-phase coil, each phase coil includes N coil branches, first ends of the N coil branches in each phase coil are connected together to form a phase end point, second ends of the N coil branches in each phase coil are connected with second ends of the N coil branches in other phase coils in a one-to-one correspondence manner to form N connection points, where N is an integer greater than or equal to 1.

The first winding unit N1 may also be a coil branch of a neutral point formed by two or more connection points, the second winding unit N2 may also be a coil branch of a neutral point formed by two or more connection points, and the connection point forming the first winding unit N1 and the connection point forming the second winding unit N2 are different connection points, that is, the first winding unit N1 and the second winding unit N2 have different neutral points.

The first winding unit N1 includes at least two phase endpoints and at least one neutral point, and at least one neutral line is led out from at least one neutral point, and the first winding unit N1 is connected 142 with the second charge and discharge connection end through the at least one neutral line; the second winding unit N2 includes at least two phase terminals and at least one neutral point, and at least one neutral line is led out from at least one neutral point, the second winding unit is connected to the third charge-discharge connection terminal 143 through the at least one neutral line, and both the first winding unit N1 and the second winding unit N2 are connected to the reversible PWM rectifier 11 through the phase terminals.

In this embodiment, at least one neutral line may be led out from one neutral point, and one neutral line may also be led out from each of a plurality of neutral points, which is not limited herein.

It should be noted that the first winding unit N1 and the second winding unit N2 may be respectively located in the motor coils 12 of different motors, or may be located in the motor coil 12 of the same motor, that is, when the first winding unit N1 is located in the motor coil 12 of one motor, the second winding unit N2 may be located in the motor coil 12 of another motor; alternatively, the first winding unit N1 and the second winding unit N2 are in the motor coil 12 of the same motor.

The energy conversion device further comprises a control module, the control module is respectively connected with the reversible PWM rectifier 11 and the bidirectional bridge arm 13 and sends control signals to the reversible PWM rectifier 11 and the bidirectional bridge arm 13, the control module CAN comprise a vehicle control unit, a control circuit of the reversible PWM rectifier 11 and a BMS battery manager circuit, the vehicle control unit, the reversible PWM rectifier 11 and the BMS battery manager circuit are connected through CAN lines, and different modules in the control module control the on and off of power switches in the bidirectional bridge arm 13 and the reversible PWM rectifier 11 according to the acquired information so as to achieve the on of different current loops.

When the charging and discharging connection end group 14 of the energy conversion device is connected with the external ac port 3, the motor coil 12 and the bidirectional arm 13, and the reversible PWM rectifier 11 and the bidirectional arm 13 are connected with the external battery 2, the energy conversion device can work in a driving mode, a heating mode, an ac charging mode and an ac discharging mode:

when the energy conversion device works in a driving mode, the battery 2, the reversible PWM rectifier 11 and the motor coil 12 form a driving loop, the battery 2 supplies direct current to the reversible PWM rectifier 11, the reversible PWM rectifier 11 inverts the direct current into multi-phase alternating current, and the multi-phase alternating current is input into the motor coil 12 to drive the motor to run.

When the energy conversion device works in a heating mode, the battery 2, the reversible PWM rectifier 11 and the motor coil 12 form a heating loop, the battery 2 provides direct current to the reversible PWM rectifier 11, the reversible PWM rectifier 11 inverts the direct current into multi-phase current, the multi-phase current is input into the motor coil 12, the motor coil is electrified to heat the motor coil, a motor rotor can be in a static state or a rotating state or a back-and-forth rotating state or a swinging state of a small-range position, the battery discharges through a motor winding, and the motor winding generates heat to heat a cooling medium to heat the battery or other equipment. The heating process can be carried out simultaneously with a direct current charge-discharge loop or an alternating current charge-discharge loop; or the direct current charge-discharge circuit or the alternating current charge-discharge circuit and the driving circuit are simultaneously carried out.

Or when the energy conversion device works in a heating mode, the battery 2, the reversible PWM rectifier 11, the motor coil 12 and the switch module form a heating loop, the battery 2 provides direct current to the reversible PWM rectifier 11, the reversible PWM rectifier 11 and the switch module enable the direct current to flow from at least one set of windings of the motor to at least one other set of windings through the switch module, the motor coil 12 is electrified to enable the motor coil 12 to be heated, wherein the motor rotor can be in a static state or a rotating state or a back-and-forth rotating state or a swinging state of a small range position, the battery discharges through the motor winding, and the motor winding generates heat to heat a cooling medium to heat the battery or other equipment. The heating process can be carried out simultaneously with the direct current charging and discharging loop; or the direct current charging and discharging circuit and the driving circuit are simultaneously carried out.

When the motor is in power consumption heat production and heats the battery, the amplitude and the frequency of the charge-discharge ripple wave of the battery can be increased to enable the battery to produce heat quickly, and meanwhile, the purpose of heating the battery quickly can be achieved by combining the heat production of the motor and the heating of the cooling liquid.

When the energy conversion device works in an alternating current charging mode, the battery 2, the energy conversion device and the alternating current port 3 form an alternating current charging circuit, and the alternating current port 3 is connected with alternating current power supply equipment and provides an alternating current power supply for the alternating current charging circuit.

When the energy conversion device works in an alternating current discharge mode, the battery 2, the energy conversion device and the alternating current port 3 form an alternating current discharge circuit, the alternating current port 3 is connected with alternating current electric equipment, and the alternating current discharge circuit provides alternating current power for the alternating current electric equipment.

It should be noted that, in the present application, the "external battery" and the "external ac port" described in the present embodiment are "external" with respect to the energy conversion device, and are not "external" of the vehicle in which the energy conversion device is located, and meanwhile, the "external battery" and the "battery" mentioned in the present application are the same in meaning, and the "external ac port" and the "ac port" mentioned in the present application are the same in meaning.

In this embodiment, by using an energy conversion device including a reversible PWM rectifier 11, a motor coil 12, a bidirectional bridge arm 13, and a charge/discharge connection terminal group 14, the energy conversion device can be operated in a driving mode, an ac charging mode, and an ac discharging mode after being connected to an external ac port 3 and an external battery 2, when the energy conversion device is in the driving mode, the external battery 2, the reversible PWM rectifier 11, and the motor coil 12 form a driving loop, when the energy conversion device is in the ac charging mode, the external ac port 3 forms an ac charging circuit with the external battery 2 through the energy conversion device, when the energy conversion device is in the ac discharging mode, the external battery 2 forms an ac discharging circuit with the external ac port 3 through the energy conversion device, and the motor is driven to output power through the driving loop, discharge or receive charging to outside through exchange discharge circuit or exchange charging circuit, it is not enough to have realized receiving alternating current power supply equipment's when 2 electric quantities of battery outside charge to and discharge to exchanging electric equipment when 2 electric quantities of battery outside are sufficient, and drive circuit, all adopt reversible PWM rectifier 11 and motor coil 12 in exchange charge circuit and the exchange discharge circuit, thereby both simplified circuit structure, the integrated level has also been promoted, and then reach the purpose that volume reduction and cost reduction, the problem that current overall control circuit structure including 2 charging circuit of battery and motor drive circuit is complicated, the integrated level is low, bulky and with high costs has been solved.

Further, as an embodiment of the present application, as shown in fig. 2, a first end of the external battery 2 is connected to a first bus terminal of the reversible PWM rectifier 11, a second end of the battery 2 is connected to a second bus terminal of the reversible PWM rectifier 11, and the battery, the reversible PWM rectifier 11 and the motor coil 12 in the energy conversion device form a driving circuit.

Specifically, the battery 2 forms a first driving loop together with the reversible PWM rectifier 11 and the first winding unit N1, the battery 2 forms a second driving loop together with the reversible PWM rectifier 11 and the second winding unit N2, the battery 2 forms a third driving loop together with the reversible PWM rectifier 11, the first winding unit N1 and the second winding unit N2, the battery 2 supplies direct current to the reversible PWM rectifier 11, the reversible PWM rectifier 11 inverts the direct current into three-phase alternating current, and inputs the three-phase alternating current into the motor coil 12 to drive the motor to operate.

In this embodiment, this energy conversion device can utilize multiple mode to drive, when one of them winding unit N1 damages, can also utilize other winding unit to drive, simultaneously, utilize two winding units to crisscross drive, can also improve the life of winding unit, can also utilize two winding units to drive simultaneously, can produce bigger drive power, promote the driveability, select different drive circuit according to different demands, effectively improved the flexibility that this energy conversion device used.

Further, as an embodiment of the present invention, as shown in fig. 2, the second end of the ac port 3 may be connected to a third charge/discharge connection terminal 143.

The alternating current port 3 and the battery 2 form a first alternating current charging circuit through the energy conversion device or the battery 2 and the alternating current port 3 form a first alternating current discharging circuit through the energy device, the alternating current port 3 and the battery 2 form a second alternating current charging circuit through the energy conversion device or the battery 2 and the alternating current port 3 form a second alternating current discharging circuit through the energy conversion device, the alternating current port 3 and the battery 2 form a third alternating current charging circuit through the energy conversion device or the battery 2 and the alternating current port 3 form a third alternating current discharging circuit through the energy conversion device, and the alternating current port 3 and the battery 2 form a fourth alternating current charging circuit through the energy conversion device or the battery 2 and the alternating current port 3 form a fourth alternating current discharging circuit through the energy conversion device and the alternating current port 3.

Further, as an embodiment of the present application, the ac power supply device, the first winding unit N1, the reversible PWM rectifier 11, the battery 2, and the bidirectional arm 13 form a first ac charging circuit;

or the alternating-current power supply device, the second winding unit N2, the reversible PWM rectifier 11, the battery 2, and the bidirectional arm 13 form a second alternating-current charging circuit;

alternatively, the ac power supply device, the bidirectional arm 13, the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11, and the battery 2 form a third ac charging circuit

Or the alternating-current power supply device, the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11, the battery 2, and the bidirectional arm 13 form a fourth alternating-current charging circuit;

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

The energy conversion device selects the first alternating current charging circuit or the second alternating current charging circuit or the third alternating current charging circuit or the fourth alternating current charging circuit to work according to an external control signal, namely the energy conversion device controls the bidirectional bridge arm 13 and/or the reversible PWM rectifier 11 to select the first alternating current charging circuit or the second alternating current charging circuit or the third alternating current charging circuit or the fourth alternating current charging circuit to work according to the external control signal, controls the bidirectional bridge arm 13 to be in a working state, and controls the working state of the reversible PWM rectifier 11 to select the first alternating current charging circuit or the second alternating current charging circuit or the third alternating current charging circuit or the fourth alternating current charging circuit.

In the ac charging circuit, the ac power supply device supplies ac power to the ac charging circuit.

The first ac charging circuit and the second ac charging circuit are different in that different winding units in the motor coil 12 and arms of the reversible PWM rectifier correspondingly connected to the winding units are used, the first ac charging circuit uses arms of the first winding unit N1 and the reversible PWM rectifier 11 correspondingly connected to the first winding unit N1, and the second ac charging circuit uses arms of the second winding unit N2 and the reversible PWM rectifier 11 correspondingly connected to the second winding unit N2. In addition, the third ac charging circuit can simultaneously utilize the first winding unit N1, the second winding unit N2, and the reversible PWM rectifier 11, as compared to the first ac charging circuit and the second ac charging circuit. Compared with the third alternating current charging circuit, the fourth alternating current charging circuit also needs to adopt two winding units, the third alternating current charging circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are mutually staggered for charging, and the fourth alternating current charging circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are synchronously controlled for charging.

In this embodiment, since the first ac charging circuit and the second ac charging circuit both use one winding unit connected in series with the ac power supply device, the winding of the motor can be used as an inductor, an external inductor is omitted, the quality and space of the controller are saved, high-power charging and discharging are realized, multi-dimensional multiplexing of the motor is realized, the integration level is high, and the third ac charging circuit and the fourth ac charging circuit are used for ac charging, the first winding unit N1 and the second winding unit N2 can be simultaneously used, and compared with the first ac charging circuit and the second ac charging circuit, the first winding unit N1 and the second winding unit N2 can be more fully used, and the equivalent inductance when the motor is used is increased.

Further, as an embodiment of the present application, when the energy conversion device selects the first ac charging circuit according to the external control signal, the ac power supply device, the first winding unit N1, the reversible PWM rectifier 11, and the bidirectional arm 13 form an ac charging energy storage circuit, and the ac power supply device, the first winding unit N1, the reversible PWM rectifier 11, the battery 2, and the bidirectional arm 13 form an ac charging energy release circuit. In the first ac charging circuit, the ac power supply device provides an ac power supply for the first ac charging circuit, the ac charging energy storage loop completes energy storage of the first winding unit N1, the ac charging energy release loop completes energy release of the first winding unit N1, so that the reversible PWM rectifier 11 and the bidirectional bridge arm 13 can output boosted dc power, and the ac power supply device, the first winding unit N1 and the reversible PWM rectifier 11 charge the battery 2 together through the energy storage energy release loop, thereby implementing a process in which the ac power supply device charges the battery 2 through the first ac charging circuit.

When the energy conversion device selects the second alternating current charging circuit according to the external control signal, the alternating current power supply device, the second winding unit N2, the reversible PWM rectifier 11 and the bidirectional bridge arm 13 form an alternating current energy storage loop, and the alternating current power supply device, the second winding unit N2, the reversible PWM rectifier 11, the battery 2 and the bidirectional bridge arm 13 form an alternating current energy storage and release loop. In the second ac charging circuit, the ac power supply device provides an ac power supply for the second ac charging circuit, the ac charging energy storage loop completes energy storage of the second winding unit N2, the ac charging energy release loop completes energy release of the second winding unit N2, so that the reversible PWM rectifier 11 and the bidirectional bridge arm 13 can output boosted dc power, and the ac power supply device, the second winding unit N2 and the reversible PWM rectifier 11 charge the battery 2 together through the energy storage energy release loop, thereby implementing a process in which the ac power supply device charges the battery 2 through the second ac charging circuit.

It should be noted that when any one of the first ac charging circuit and the second ac charging circuit is selected to operate, the same phase or wrong phase control may be adopted between the multi-phase bridge arms of the reversible PWM rectifier, the same phase control is to control the multi-phase bridge arms to be conducted at the same time, the wrong phase control is to control the multi-phase bridge arms to be conducted at wrong time, and the periods are kept consistent, when the same phase control is adopted, the current of each phase winding of the motor is basically consistent, and the resultant magnetic field strength generated by all windings of the same phase motor is basically zero, the rotor of the motor has no risk of demagnetization, the motor has no torque output, and the resultant magnetic field strength is basically zero, thereby greatly reducing the iron loss of the motor, improving the efficiency during charging and discharging, and the current during charging can be sampled by the phase current of the motor continuously; when the phase-staggered control is adopted, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered in a certain phase, the composite magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during charging by using a Hall.

When the energy conversion device selects the third alternating current charging circuit according to the external control signal, the alternating current power supply equipment, the first winding unit N1, the reversible PWM rectifier 11 and the bidirectional bridge arm 13 form an alternating current charging energy storage loop, and the alternating current power supply equipment, the second winding unit N2, the reversible PWM rectifier 11, the battery 2 and the bidirectional bridge arm 13 form an alternating current charging energy release loop; or the alternating-current power supply equipment, the second winding unit N2, the reversible PWM rectifier 11, and the bidirectional arm 13 form an alternating-current charging energy storage circuit, and the alternating-current power supply equipment, the first winding unit N1, the reversible PWM rectifier 11, the battery 2, and the bidirectional arm 13 form an alternating-current charging energy release circuit.

In the third ac charging circuit, the first winding unit N1 and the second winding unit N2 charge the battery 2 in an interleaved ac charging manner, the ac charging energy storage loop formed by the ac power supply device, the first winding unit N1, the reversible PWM rectifier 11, and the bidirectional bridge arm 13 completes energy storage of the first winding unit N1, the ac energy release loop formed by the ac power supply device, the first winding unit N1, the reversible PWM rectifier 11, the battery 2, and the bidirectional bridge arm 13 completes energy release of the first winding unit N1, so that the reversible PWM rectifier 11 and the bidirectional bridge arm 13 can output boosted dc power to charge the battery 2; the energy storage of the second winding unit N2 is completed by an alternating current charging energy storage loop formed by the alternating current power supply device, the second winding unit N2, the reversible PWM rectifier 11 and the bidirectional bridge arm 13, and the energy release of the second winding unit N2 is completed by an alternating current energy release loop formed by the alternating current power supply device, the second winding unit N2, the reversible PWM rectifier 11, the battery 2 and the bidirectional bridge arm 13, so that the reversible PWM rectifier 11 and the bidirectional bridge arm 13 can output boosted direct current to charge the battery 2. The alternating-current charging energy storage loop and the alternating-current charging energy release loop are performed in a staggered mode, and when the first winding unit N1 releases energy, the second winding unit N2 stores energy; when the first winding unit N1 stores energy, the second winding unit N2 releases energy and is controlled alternately to charge the battery 2.

For the third alternating current charging circuit, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered with a certain phase, the synthesized magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during charging by using a Hall.

When the energy conversion device selects the fourth alternating current charging circuit according to the external control signal, the alternating current power supply device, the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11 and the bidirectional bridge arm 13 form an alternating current charging energy storage loop, and the alternating current power supply device, the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11, the battery 2 and the bidirectional bridge arm 13 form an alternating current charging energy release loop. The alternating current power supply equipment provides an alternating current power supply for the fourth alternating current charging circuit, the alternating current charging energy storage loop finishes energy storage of the first winding unit N1 and the second winding unit N2, the alternating current charging energy release loop finishes energy release of the first winding unit N1 and the second winding unit N2, so that the reversible PWM rectifier 11 and the bidirectional bridge arm 13 can output boosted direct current, the alternating current power supply equipment, the first winding unit N1, the second winding unit N2 and the reversible PWM rectifier 11 charge the battery 2 together through the energy storage energy release loop, and the process that the alternating current power supply equipment charges the battery 2 through the fourth alternating current charging circuit is achieved.

For the fourth alternating current charging circuit, the first winding unit N1 of the motor and the second winding unit N2 of the motor adopt the same phase control, the current of each phase winding of the motor is basically consistent, the composite magnetic field intensity generated by all the windings of the same phase motor is basically zero, the rotor of the motor has no risk of demagnetization, the motor has no torque output, the composite magnetic field intensity is basically zero, the iron loss of the motor is greatly reduced, the charging efficiency is improved, because the same-phase control is adopted between the bridge arms of the first winding unit N1 of the motor and the same-phase control is adopted between the bridge arms of the second winding unit N2 of the motor, the equivalent inductance of the winding is smaller, but with a wrong phase control between the bridge arm connected to the first winding element N1 and the bridge arm connected to the second winding element N2, the defect that the equivalent inductance of the same-phase motor is small can be overcome, and the efficiency of charging can be improved by adopting an optimal control method to increase the equivalent inductance of the motor during charging.

In the embodiment, the alternating-current charging energy storage loop and the alternating-current charging energy release loop are formed in the alternating-current charging circuit, so that the reversible PWM rectifier 11 and the bidirectional bridge arm 13 can output boosted direct current, the charging power is improved, and the efficiency of charging the battery 2 is effectively improved.

Further, as an embodiment of the present application, when the ac port 3 is connected to the ac consumer, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the ac consumer, and the bidirectional arm 13 form a first ac discharge circuit;

or the battery 2, the reversible PWM rectifier 11, the second winding unit N2, the ac consumer, and the bidirectional arm 13 form a second ac discharge circuit;

alternatively, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, the ac electric device, and the bidirectional arm 13 form a third ac discharge circuit

Or the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, the ac electric equipment, and the fourth ac discharge circuit of the bidirectional arm 13;

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

The energy conversion device selects the first alternating current discharge circuit or the second alternating current discharge circuit or the third alternating current discharge circuit or the fourth alternating current discharge circuit to work according to an external control signal, namely the energy conversion device controls the bidirectional bridge arm 13 and/or the reversible PWM rectifier 11 to select the first alternating current discharge circuit or the second alternating current discharge circuit or the third alternating current discharge circuit or the fourth alternating current discharge circuit to work according to the external control signal, and controls the working states of the reversible PWM rectifier 11 and the bidirectional bridge arm 13 to select the first alternating current discharge circuit or the second alternating current discharge circuit or the third alternating current discharge circuit or the fourth alternating current discharge circuit.

The first ac discharge circuit and the second ac discharge circuit are different in that different winding units in the motor coil 12 and arms of the reversible PWM rectifier correspondingly connected to the winding units are used, the first ac discharge circuit uses arms of the first winding unit N1 and the reversible PWM rectifier 11 correspondingly connected to the first winding unit N1, and the second ac discharge circuit uses arms of the second winding unit N2 and the reversible PWM rectifier 11 correspondingly connected to the second winding unit N2. In addition, the third ac discharge circuit can simultaneously utilize the first winding unit N1, the second winding unit N2, and the reversible PWM rectifier 11, as compared to the first and second ac discharge circuits. Compared with the third alternating current discharge circuit, the fourth alternating current discharge circuit also needs to adopt two winding units, the third alternating current discharge circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are mutually staggered for charging, and the fourth alternating current discharge circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are synchronously controlled for discharging.

In this embodiment, because the first ac discharging circuit and the second ac discharging circuit both utilize a winding unit connected in series with the ac electric device, the equivalent inductance value when the motor winding is used as an inductor to use the motor can be used, the charging and discharging ripple of the winding unit is small, and the control mode is simple, and the external inductance is omitted, the controller quality is saved, the multi-dimensional multiplexing of the motor is realized, the integration level is high, and the third ac discharging circuit and the fourth ac discharging circuit are used for ac charging, the first winding unit N1 and the second winding unit N2 can be simultaneously utilized, compared with the first ac discharging circuit and the second ac discharging circuit, the first winding unit N1 and the second winding unit N2 can be more fully utilized, and the equivalent inductance value when the motor is used is increased.

Further, as an embodiment of the present application, when the energy conversion device selects the first ac discharge circuit according to the external control signal, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the ac consumer, and the bidirectional arm 13 form an ac discharge energy storage circuit, and the reversible PWM rectifier 11, the first winding unit N1, the ac consumer, and the bidirectional arm 13 form an ac discharge energy release circuit. In the first ac discharge circuit, the first ac discharge circuit provides an ac power supply for the ac electrical device, the ac charging energy storage loop completes energy storage of the first winding unit N1, and the ac charging energy release loop completes energy release of the first winding unit N1, so that the first winding unit N1 can output ac power after voltage reduction, and the battery 2, the reversible PWM rectifier 11 and the first winding unit N1 together charge the ac electrical device through the energy storage energy release loop, thereby realizing a process of supplying power to the ac electrical device through the first ac discharge circuit.

When the energy conversion device selects the second alternating current discharge circuit according to the external control signal, the battery 2, the reversible PWM rectifier 11, the second winding unit N2, the alternating current electric equipment, and the bidirectional arm 13 form an alternating current discharge energy storage circuit, and the reversible PWM rectifier 11, the second winding unit N2, the alternating current electric equipment, and the bidirectional arm 13 form an alternating current discharge energy release circuit. In the second ac discharge circuit, the second ac discharge circuit provides an ac power supply for the ac electric device, the ac charging energy storage loop completes energy storage of the second winding unit N2, and the ac charging energy release loop completes energy release of the second winding unit N2, so that the second winding unit N2 can output ac power after voltage reduction, and the battery 2, the reversible PWM rectifier 11 and the second winding unit N2 charge the ac electric device together through the energy storage energy release loop, thereby realizing a process of supplying power to the ac electric device through the second ac discharge circuit.

It should be noted that when any one of the first ac discharge circuit and the second ac discharge circuit is selected to operate, the same phase or wrong phase control may be adopted between the multiphase bridge arms of the reversible PWM rectifier, the same phase control is to control the multiphase bridge arms to conduct at the same time, the wrong phase control is to control the multiphase bridge arms to conduct at wrong time, and the periods are kept consistent, when the same phase control is adopted, the current of each phase winding of the motor is basically consistent, and the resultant magnetic field strength generated by all windings of the same phase motor is basically zero, the motor rotor has no risk of demagnetization, the motor has no torque output, the resultant magnetic field strength is basically zero, the iron loss of the motor is greatly reduced, the efficiency during charging and discharging is improved, and the current during discharging can be sampled by using the phase current of the motor continuously; when the phase-staggered control is adopted, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered in a certain phase, the synthesized magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during discharging by using a Hall.

When the energy conversion device selects the third alternating current discharge circuit according to the external control signal, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the alternating current electric equipment and the bidirectional bridge arm 13 form an alternating current discharge energy storage loop, and the reversible PWM rectifier 11, the second winding unit N2, the alternating current electric equipment and the bidirectional bridge arm 13 form an alternating current discharge energy release loop; or the battery 2, the reversible PWM rectifier 11, the second winding unit N2, the ac electric device, and the bidirectional arm 13 form an ac discharge energy storage circuit, and the reversible PWM rectifier 11, the first winding unit N1, the ac electric device, and the bidirectional arm 13 form an ac discharge energy release circuit.

In the third ac discharge circuit, the first winding unit N1 and the second winding unit N2 supply power to the ac electric device by using an interleaved ac charging manner, the ac discharge energy storage loop formed by the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the ac electric device and the bidirectional bridge arm 13 completes energy storage of the first winding unit N1, and the ac discharge energy release loop formed by the reversible PWM rectifier 11, the first winding unit N1, the ac electric device and the bidirectional bridge arm 13 completes energy release of the first winding unit N1, so that the first winding unit N1 can output a dc voltage reduced by the voltage reduction to supply power to the ac electric device; the battery 2, the reversible PWM rectifier 11, the second winding unit N2, the ac electric device, and the ac discharge energy storage loop formed by the bidirectional bridge arm 13 complete energy storage of the second winding unit N2, and the reversible PWM rectifier 11, the second winding unit N2, the ac electric device, and the ac discharge energy release loop formed by the bidirectional bridge arm 13 complete energy release of the second winding unit N2, so that the second winding unit N2 can output a dc current after voltage reduction to supply power to the ac power supply device. The alternating current discharge energy storage loop and the alternating current discharge energy release loop are performed in a staggered mode, and when the first winding unit N1 releases energy, the second winding unit N2 stores energy; when the first winding unit N1 stores energy, the second winding unit N2 releases energy, and the power supply process of the alternating current electric device is realized through alternate control.

For the third alternating current discharge circuit, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered with a certain phase, the synthesized magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during discharging by using a Hall.

When the energy conversion device selects the fourth ac discharge circuit according to the external control signal, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, the ac consumer, and the bidirectional arm 13 form an ac discharge energy storage circuit, and the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, the ac consumer, and the bidirectional arm 13 form an ac discharge energy release circuit. In the fourth ac discharge circuit, the fourth ac discharge circuit provides an ac power supply for the ac electric device, the ac charging energy storage loop completes energy storage of the first winding unit N1 and the second winding unit N2, the ac charging energy release loop completes energy release of the first winding unit N1 and the second winding unit N2, so that the first winding unit N1 and the second winding unit N2 can output ac power after voltage reduction, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, and the second winding unit N2 together charge the ac electric device through the energy storage energy release loop, and a process of supplying power to the ac electric device through the fourth ac discharge circuit is achieved.

For the fourth alternating current discharge circuit, the first winding unit N1 of the motor and the second winding unit N2 of the motor adopt the same phase control, the current of each phase winding of the motor is basically consistent, the synthesized magnetic field intensity generated by all the windings of the same phase 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 discharge is improved, because the same-phase control is adopted between the bridge arms of the first winding unit N1 of the motor and the same-phase control is adopted between the bridge arms of the second winding unit N2 of the motor, the equivalent inductance of the winding is smaller, but with a wrong phase control between the bridge arm connected to the first winding element N1 and the bridge arm connected to the second winding element N2, the defect of small equivalent inductance of the same-phase motor can be overcome, and the optimal control method is adopted, so that the equivalent inductance of the motor during discharging is increased, and the efficiency of discharging is improved.

In the present embodiment, an ac discharge energy storage circuit and an ac discharge energy release circuit are formed in the ac discharge circuit, so that the motor coil 12 can output the ac power that is stepped down to meet the requirement of the ac consumer for charging power.

Further, as an embodiment of the present application, as shown in fig. 3, the energy conversion apparatus further includes a switch module 15, and the charge and discharge connection terminal group 14 further includes a fourth charge and discharge connection terminal 144.

Specifically, the switch module 15 is connected between the second charge-discharge connection end 142 and the third charge-discharge connection end 143, and the fourth charge-discharge connection end 144 is connected to the second bus end of the reversible PWM rectifier.

In this embodiment, when the external dc port 4 is connected to the fourth charging/discharging connection terminal 144 and the third charging/discharging connection terminal 143, the dc power supply device is connected to the dc port 4, the dc power supply device and the energy conversion device form a dc charging circuit with the battery 2, the dc power device is connected to the dc port 4, the dc power device and the energy conversion device form a dc discharging circuit with the battery 2, and different power sources can be used for charging, so that the flexibility of the energy conversion device is improved, the application scenarios of the energy conversion device are increased, and meanwhile, by using the switch module 15 in the energy conversion device, the switch module 15 can control the conduction state between the second charging/discharging connection terminal 142 and the third charging/discharging connection terminal 143, so as to switch the first ac charging circuit, the first ac discharging circuit, and the third ac charging/discharging circuit, The energy conversion device comprises a third alternating current discharge circuit, a fourth alternating current charging circuit and a direct current charge and discharge circuit, wherein a switch module 15 is applied to the direct current charging circuit, the third alternating current discharge circuit, the fourth alternating current charging circuit and the direct current charge and discharge circuit, so that the number of used switches is effectively reduced, and the wiring space in the energy conversion device is also saved.

It should be noted that, in some examples, when the switch module 15 is in the off state, and the first charge-discharge connection terminal 141 and the second charge-discharge connection terminal 142 are respectively connected to the first end and the second end of the ac port 3 in a one-to-one correspondence manner, the third charge-discharge connection terminal 143 and the fourth charge-discharge connection terminal 144 are respectively connected to the first end and the second end of the dc port 4 in a one-to-one correspondence manner, the ac port 3 is connected to the ac power supply device, and the dc port 4 is connected to the dc power supply device, the first ac charging circuit and the second dc charging circuit can be performed simultaneously, so that the compatibility of the energy conversion device to the charging power supply is effectively improved, and diversified charging is implemented.

In other examples, when the switch module 15 is in the off state, and the first charge-discharge connection terminal 141 and the second charge-discharge connection terminal 142 are respectively connected to the first end and the second end of the ac port 3 in a one-to-one correspondence manner, the third charge-discharge connection terminal 143 and the fourth charge-discharge connection terminal 144 are respectively connected to the first end and the second end of the dc port 4 in a one-to-one correspondence manner, the ac port 3 is connected to an ac discharge device, and the dc port 4 is connected to a dc discharge device, the first ac discharge circuit and the second dc discharge circuit can be simultaneously performed, or the dc port 4 is dc charged and the ac port 3 is ac discharged; or the direct current port 4 discharges the direct current and the alternating current port 3 charges the alternating current, so that the compatibility of a discharging power supply of the battery 2 through the energy conversion device is effectively improved, and diversified discharging is realized.

In this embodiment, the energy conversion device is connected to the dc port 4 and the battery 2, so that the energy conversion device can be operated in a driving mode, an ac charging mode, an ac discharging mode, a dc charging mode, and a dc discharging mode at different times, and when a part of components in the energy conversion device are damaged, other components can be used to operate, thereby effectively improving the fault tolerance of the energy conversion device and the flexibility of using the energy conversion device, and meanwhile, in the driving mode, the ac charging mode, the ac discharging mode, the dc charging mode, and the dc discharging mode, the reversible PWM rectifier 11 and the motor coil 12 are all used, thereby simplifying the circuit structure, improving the integration level, and further achieving the purposes of volume reduction and cost reduction.

Further, as an embodiment of the present application, as shown in fig. 4, an external dc port 4 is connected to the energy conversion device.

Specifically, a first end of the ac port 3 is connected to the first charge-discharge connection terminal 141, a second end of the ac port 3 is connected to the second charge-discharge connection terminal 142, a second end of the ac port 3 is connected to the third charge-discharge connection terminal 143 through the switch module 15, a first end of the dc port 4 is connected to the third charge-discharge connection terminal 143, a first end of the dc port 4 is connected to the second charge-discharge connection terminal 142 through the switch module 15, and a second end of the dc port 4 is connected to the fourth charge-discharge connection terminal 144.

In the present embodiment, the ac port 3 and the battery 2 form an ac charging circuit through the energy conversion device or the battery 2 and the ac port 3 form an ac discharging circuit through the energy conversion device, the dc port 4 and the battery 2 form a first dc charging circuit through the first winding unit N1 and the reversible PWM rectifier 11 in the energy conversion device or the battery 2 and the reversible PWM rectifier 11 and the dc port 4 form a first dc discharging circuit through the first winding unit N1 and the reversible PWM rectifier 11 in the energy conversion device, the dc port 4 and the battery 2 form a second dc charging circuit through the second winding unit N2 and the reversible PWM rectifier 11 in the energy conversion device or the battery 2 and the reversible PWM rectifier 11 in the energy conversion device form a second dc discharging circuit through the second winding unit N2, the reversible PWM rectifier 11 and the dc port 4 in the energy conversion device, and the dc port 4 and the dc port N1, the second winding unit N2 in the energy conversion device, The reversible PWM rectifier 11 and the battery 2 form a third dc charging circuit or a fourth dc charging circuit, and the battery 2 forms a third dc discharging circuit or a fourth dc discharging circuit through the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2 and the dc port 4 in the energy conversion device.

It should be noted that a switch may be further disposed between the fourth charge-discharge terminal 144 and the second bus terminal of the reversible PWM rectifier 11, for controlling a conduction state between the fourth charge-discharge terminal 144 and the second bus terminal of the reversible PWM rectifier 11.

Further, as an embodiment of the present application, when the dc port 4 is connected to the dc power supply apparatus, the dc power supply apparatus forms a first dc charging circuit with the battery 2 through the first winding unit N1, the reversible PWM rectifier 11 and the energy conversion device;

or, the dc power supply device forms a second dc charging circuit with the battery 2 through the second winding unit N2, the reversible PWM rectifier 11 in the energy conversion device;

or, the dc power supply device forms a third dc charging circuit through the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 in the energy conversion device;

or, the dc power supply device forms a fourth dc charging circuit through the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 in 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.

The energy conversion device selects the first direct current charging circuit, the second direct current charging circuit, the third direct current charging circuit or the fourth direct current charging circuit to work according to the external control signal, which means that 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 or the fourth direct current charging circuit to work by controlling the switch module 15 and/or the reversible PWM rectifier 11 according to the external control signal.

The first dc charging circuit and the second dc charging circuit are different in that different winding units in the motor coil 12 and arms of the reversible PWM rectifier correspondingly connected to the winding units are used, the first dc charging circuit uses arms of the first winding unit N1 and the reversible PWM rectifier 11 correspondingly connected to the first winding unit N1, and the second dc charging circuit uses arms of the second winding unit N2 and the reversible PWM rectifier 11 correspondingly connected to the second winding unit N2. In addition, compared with the first dc charging circuit and the second dc charging circuit, the third dc charging circuit can utilize the first winding unit N1, the second winding unit N2 and the reversible PWM rectifier 11 at the same time, so that the inductance generated by the motor coil 12 is larger, and the effect of small current ripple is more significant. Compared with the third direct current charging circuit, the fourth direct current charging circuit also needs to adopt two winding units, the third direct current charging circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are mutually staggered to charge, and the fourth direct current charging circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are synchronously controlled to charge.

In this embodiment, since the first dc charging circuit and the second dc charging circuit both use one winding unit connected in series with the dc power supply device, the winding of the motor can serve as an inductor, which saves external inductance, saves controller quality, realizes multi-dimensional multiplexing of the motor, and has high integration level, and the third dc charging circuit and the fourth dc charging circuit are used for dc charging, and the first winding unit N1 and the second winding unit N2 can be simultaneously used, so that compared with the first dc charging circuit and the second dc charging circuit, the first winding unit N1 and the second winding unit N2 can be more fully used, and equivalent inductance when the motor is used is increased.

Further, as an embodiment of the present application, when the dc port 4 forms a first dc charging circuit with the battery 2 through the first winding unit N1, the reversible PWM rectifier 11 and the energy conversion device, the dc power supply device, the first winding unit N1 and the reversible PWM rectifier 11 form a dc charging energy storage loop, and the dc power supply device, the first winding unit N1, the reversible PWM rectifier 11 and the battery 2 form a dc charging energy release loop. In the first dc charging circuit, the dc power supply device provides a dc power supply for the first dc charging circuit, the dc charging energy storage loop completes energy storage of the first winding unit N1, the dc charging energy release loop completes energy release of the first winding unit N1, so that the reversible PWM rectifier 11 can output boosted dc power, and the dc power supply device, the first winding unit N1 and the reversible PWM rectifier 11 charge the battery 2 together through the energy storage energy release loop, thereby implementing a process of charging the battery 2 by the dc power supply device through the first dc charging circuit.

When the dc port 4 forms a second dc charging circuit with the battery 2 through the second winding unit N2, the reversible PWM rectifier 11 and the energy conversion device, the dc power supply device, the second winding unit N2 and the reversible PWM rectifier 11 form a dc charging energy storage loop, and the dc power supply device, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 form a dc charging energy release loop. In the second dc charging circuit, the dc power supply device provides a dc power supply for the second dc charging circuit, the dc charging energy storage loop completes energy storage of the second winding unit N2, the dc charging energy release loop completes energy release of the second winding unit N2, so that the reversible PWM rectifier 11 can output boosted dc power, and the dc power supply device, the second winding unit N2 and the reversible PWM rectifier 11 charge the battery 2 together through the energy storage energy release loop, thereby implementing a process of charging the battery 2 by the dc power supply device through the second dc charging circuit.

It should be noted that when any one of the first dc charging circuit and the second dc charging circuit is selected to work, the same phase or wrong phase control may be adopted between the multi-phase bridge arms of the reversible PWM rectifier, the same phase control is to control the multi-phase bridge arms to be conducted at the same time, the wrong phase control is to control the multi-phase bridge arms to be conducted at wrong time, and the periods are kept consistent, when the same phase control is adopted, the current of each phase winding of the motor is basically consistent, and the resultant magnetic field strength generated by all windings of the same phase motor is basically zero, the motor rotor has no risk of demagnetization, the motor has no torque output, the resultant magnetic field strength is basically zero, the iron loss of the motor is greatly reduced, the efficiency during charging and discharging is improved, and the phase current of the motor can be continuously used to sample the current during hall sampling charging; when the phase-staggered control is adopted, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered in a certain phase, the composite magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during charging by using a Hall.

When the dc port 4 forms a third dc charging circuit through the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 in the energy conversion device, the dc power supply device, the first winding unit N1 and the reversible PWM rectifier 11 form a dc charging energy storage loop, and the dc power supply device, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 form a dc charging energy release loop; or the dc power supply device, the second winding unit N2, and the reversible PWM rectifier 11 form a dc charging energy storage loop, and the dc power supply device, the first winding unit N1, the reversible PWM rectifier 11, and the battery 2 form a dc charging energy release loop.

In the third dc charging circuit, the first winding unit N1 and the second winding unit N2 charge the battery 2 in an interleaved dc charging manner, the dc power supply device, the first winding unit N1 and the reversible PWM rectifier 11 form a dc charging energy storage loop to store energy in the first winding unit N1, the dc power supply device, the second winding unit N2 and the reversible PWM rectifier 11 form a dc charging energy storage loop to release energy in the first winding unit N1, so that the reversible PWM rectifier 11 outputs boosted dc power to charge the battery 2, the dc power supply device, the first winding unit N1 and the reversible PWM rectifier 11 form a dc charging energy storage loop to store energy in the second winding unit N2, the dc power supply device, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 form a dc charging energy release loop to release energy in the second winding unit N2, so that the reversible PWM rectifier 11 outputs a boosted dc power to charge the battery 2. The direct current charging energy storage loop and the direct current charging energy release loop are performed in an interlaced mode, and when the first winding unit N1 releases energy, the second winding unit N2 stores energy; when the first winding unit N1 stores energy, the second winding unit N2 releases energy and is controlled alternately to charge the battery 2.

For the third direct current charging circuit, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered with a certain phase, the composite magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during charging by using a Hall.

When the dc port 4 forms a fourth dc charging circuit through the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 in the energy conversion device, the dc power supply device, the first winding unit N1, the second winding unit N2 and the reversible PWM rectifier 11 form a dc charging energy storage loop, and the dc power supply device, the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11 and the battery 2 form a dc charging energy release loop. In the fourth dc charging circuit, the dc power supply device provides a dc power supply for the third dc charging circuit, the dc charging energy storage loop completes energy storage of the first winding unit N1 and the second winding unit N2, the dc charging energy release loop completes energy release of the first winding unit N1 and the second winding unit N2, so that the reversible PWM rectifier 11 can output boosted dc power, and the dc power supply device, the first winding unit N1, the second winding unit N2, and the reversible PWM rectifier 11 charge the battery 2 through the energy storage energy release loop together, thereby implementing a process of charging the battery 2 by the dc power supply device through the fourth dc charging circuit.

For the above-mentioned fourth direct current charging circuit, adopt same phase control between the bridge arm that first winding unit N1 connects, adopt same phase control between the bridge arm that second winding unit N2 connects, adopt wrong phase control between the bridge arm that first winding unit N1 connects and the bridge arm that second winding unit N2 connects simultaneously, the effect is: the first winding unit N1 of the motor and the second winding unit N2 of the motor adopt the same phase control, the current of each phase winding of the motor is basically consistent, the composite magnetic field intensity generated by all the windings of the same phase motor is basically zero, the rotor of the motor has no risk of demagnetization, the motor has no torque output, the composite magnetic field intensity is basically zero, the iron loss of the motor is greatly reduced, the charging efficiency is improved, because the same-phase control is adopted between the bridge arms of the first winding unit N1 of the motor and the same-phase control is adopted between the bridge arms of the second winding unit N2 of the motor, the equivalent inductance of the winding is smaller, but with a wrong phase control between the bridge arm connected to the first winding element N1 and the bridge arm connected to the second winding element N2, the defect that the equivalent inductance of the same-phase motor is small can be overcome, and the efficiency of charging can be improved by adopting an optimal control method to increase the equivalent inductance of the motor during charging.

In this embodiment, a dc charging energy storage loop and a dc charging energy release loop are formed in the dc charging circuit, so that the reversible PWM rectifier 11 can output boosted dc power, thereby improving charging power and effectively improving the charging efficiency of the battery 2.

Further, as an embodiment of the present application, when the dc port 4 is connected to a dc electric device, the battery 2 forms a first dc discharge circuit with the dc electric device through the reversible PWM rectifier 11, the first winding unit N1 in the energy conversion device;

or, the battery 2 forms a second dc discharge circuit with the dc electric device through the reversible PWM rectifier 11, the second winding unit N2 in the energy conversion device;

or, the battery 2 forms a third dc discharge circuit with the dc electric device through the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2 in the energy conversion device;

or, the battery 2 forms a fourth dc discharge circuit with the dc electric device through the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2 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.

The energy conversion device selects the first direct current discharge circuit, the second direct current discharge circuit, the third direct current discharge circuit or the fourth direct current discharge circuit to work according to an external control signal, namely the energy conversion device selects the first direct current discharge circuit, the second direct current discharge circuit, the third direct current discharge circuit or the fourth direct current discharge circuit to work through controlling the switch module 15 and the reversible PWM rectifier 11 according to the external control signal.

The first dc discharge circuit and the second dc discharge circuit are different in that different winding units in the motor coil 12 and arms of the reversible PWM rectifier correspondingly connected to the winding units are used, the first dc discharge circuit uses arms of the first winding unit N1 and the reversible PWM rectifier 11 correspondingly connected to the first winding unit N1, and the second dc discharge circuit uses arms of the second winding unit N2 and the reversible PWM rectifier 11 correspondingly connected to the second winding unit N2. In addition, compared with the first direct current discharge circuit and the second direct current discharge circuit, the third direct current discharge circuit can utilize the first winding unit N1, the second winding unit N2 and the reversible PWM rectifier 11 at the same time, so that the inductance generated by the motor coil 12 is larger, and the voltage reduction effect is more obvious. Compared with the third direct current discharge circuit, the fourth direct current discharge circuit also needs to adopt two winding units, the third direct current discharge circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are mutually staggered to charge, and the fourth direct current discharge circuit adopts a mode that the first winding unit N1 and the second winding unit N2 are synchronously controlled to charge.

In this embodiment, because the first dc discharge circuit and the second dc discharge circuit both utilize a winding unit connected in series with the dc power consuming device, equivalent inductance when using the motor can be increased, the charging and discharging ripple of the winding unit is small, and the control method is simple, and external inductance is omitted, the controller quality is saved, multi-dimensional multiplexing of the motor is realized, and the integration level is high, and the third dc discharge circuit and the fourth dc discharge circuit are used for dc charging, and the first winding unit N1 and the second winding unit N2 can be simultaneously utilized, compared with the first dc discharge circuit and the second dc discharge circuit, the first winding unit N1 and the second winding unit N2 can be more fully utilized, and equivalent inductance when using the motor is increased.

Further, as an embodiment of the present application, when the battery 2 forms a first dc discharge circuit with the dc power consuming device through the reversible PWM rectifier 11, the first winding unit N1, and the energy conversion device, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, and the dc power consuming device form a dc discharge energy storage circuit, and the reversible PWM rectifier 11, the first winding unit N1, and the dc power consuming device form a dc discharge energy release circuit. In the first dc discharging circuit, the first dc discharging circuit provides a dc power supply for the dc power device, the dc charging energy storage loop completes energy storage of the first winding unit N1, the dc charging energy release loop completes energy release of the first winding unit N1, so that the first winding unit N1 can output dc power after voltage reduction, the battery 2, the reversible PWM rectifier 11 and the first winding unit N1 are charged for the dc power device together through the energy storage energy release loop, and a process of supplying power to the dc power device through the first dc discharging circuit by the dc power device is realized. In the second dc discharge circuit, the second dc discharge circuit provides a dc power supply for the dc electrical equipment, the dc charging energy storage loop completes energy storage of the second winding unit N2, and the dc charging energy release loop completes energy release of the second winding unit N2, so that the second winding unit N2 can output dc power after voltage reduction, the battery 2, the reversible PWM rectifier 11 and the second winding unit N2 are charged for the dc electrical equipment together through the energy storage energy release loop, thereby realizing a process of supplying power to the dc electrical equipment through the second dc discharge circuit by the dc electrical equipment.

When the battery 2 forms a second dc discharge circuit with the dc electric device through the reversible PWM rectifier 11, the second winding unit N2, and the energy conversion device, the battery 2, the reversible PWM rectifier 11, the second winding unit N2, and the dc electric device form a dc discharge energy storage circuit, and the reversible PWM rectifier 11, the second winding unit N2, and the dc electric device form a dc discharge energy release circuit.

When the battery 2 forms a third direct current discharge circuit through the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11 and the direct current electric equipment in the energy conversion device, the battery 2, the reversible PWM rectifier 11, the first winding unit N1 and the direct current electric equipment form a direct current discharge energy storage loop, and the reversible PWM rectifier 11, the second winding unit N2 and the direct current electric equipment form a direct current discharge energy release loop; or, the battery 2, the reversible PWM rectifier 11, the second winding unit N2, and the dc power consuming device form a dc discharge energy storage loop, and the reversible PWM rectifier 11, the first winding unit N1, and the dc power consuming device form a dc discharge energy release loop.

It should be noted that when any one of the first direct current discharge circuit and the second direct current discharge circuit is selected to work, the same phase or wrong phase control can be adopted between the multi-phase bridge arms of the reversible PWM rectifier, the same phase control means controlling the multi-phase bridge arms to be conducted simultaneously, the wrong phase control means controlling the multi-phase bridge arms to be conducted in a wrong time, and keeping the periods consistent, when the same phase control is adopted, the current of each phase winding of the motor is basically consistent, the synthesized magnetic field intensity generated by all windings of the same phase motor is basically zero, the motor rotor 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 the current during Hall sampling discharging can be continuously used for sampling the current of the motor; when the phase-staggered control is adopted, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered in a certain phase, the synthesized magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during discharging by using a Hall.

In the third dc discharge circuit, the first winding unit N1 and the second winding unit N2 supply power to the dc power consuming device by using an interleaved dc discharge manner, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, and the dc power consuming device form a dc discharge energy storage loop to complete the energy storage process of the first winding unit N1, the reversible PWM rectifier 11, the first winding unit N1, and the dc power consuming device form a dc discharge energy release loop to complete the energy release process of the first winding unit N1, so that the first winding unit N1 outputs the dc power after voltage reduction to supply power to the dc power consuming device, the battery 2, the reversible PWM rectifier 11, the second winding unit N2, and the dc power consuming device form a dc discharge energy storage loop to complete the energy storage process of the second winding unit N2, the reversible PWM rectifier 11, the second winding unit N2, and the dc power consuming device form a dc discharge energy release winding loop to complete the energy release process of the second winding unit N2, so that the first winding unit N1 outputs the dc power after voltage reduction to supply the dc power consumption device. The direct-current discharge energy storage loop and the direct-current discharge energy release loop are performed in a staggered mode, and when the first winding unit N1 releases energy, the second winding unit N2 stores energy; when the first winding unit N1 stores energy, the second winding unit N2 releases energy, and the power supply process to the dc electric device is realized through alternate control.

For the third direct current discharge circuit, the equivalent inductance of the motor during charging and discharging can be further increased, the current of each phase winding of the motor is basically consistent, the phase windings of the motor are staggered with a certain phase, the composite magnetic field intensity generated by all the windings of the motor is not zero, a high-frequency rotating magnetic field exists in the motor, and the phase current of the motor can be continuously used for sampling the current during discharging by using a Hall.

When the battery 2 forms a fourth dc discharge circuit with the dc power consuming device through the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, and the energy conversion device, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, and the dc power consuming device form a dc discharge energy storage loop, and the reversible PWM rectifier 11, the first winding unit N1, the second winding unit N2, and the dc power consuming device form a dc discharge energy release loop. In the fourth dc discharge circuit, the fourth dc discharge circuit provides a dc power supply for the dc electrical device, the dc charging energy storage loop completes energy storage of the first winding unit N1 and the second winding unit N2, and the dc charging energy release loop completes energy release of the first winding unit N1 and the second winding unit N2, so that the first winding unit N1 and the second winding unit N2 can output dc power after voltage reduction, and the battery 2, the reversible PWM rectifier 11, the first winding unit N1, and the second winding unit N2 together charge the dc electrical device through the energy storage energy release loop, thereby implementing a process of supplying power to the dc electrical device through the fourth dc discharge circuit.

For the fourth direct current discharge circuit, the first winding unit N1 of the motor and the second winding unit N2 of the motor adopt the same phase control, the current of each phase winding of the motor is basically consistent, the resultant magnetic field intensity generated by all the windings of the same phase motor is basically zero, the rotor of the motor has no risk of demagnetization, the motor has no torque output, the resultant magnetic field intensity is basically zero, the iron loss of the motor is greatly reduced, the efficiency during discharge is improved, because the same-phase control is adopted between the bridge arms of the first winding unit N1 of the motor and the same-phase control is adopted between the bridge arms of the second winding unit N2 of the motor, the equivalent inductance of the winding is smaller, but with a wrong phase control between the bridge arm connected to the first winding element N1 and the bridge arm connected to the second winding element N2, the defect of small equivalent inductance of the same-phase motor can be overcome, and the optimal control method is adopted, so that the equivalent inductance of the motor during discharging is increased, and the efficiency of discharging is improved.

In the present embodiment, when the dc port 4 is connected to the dc power consuming device, the first winding unit N1, the reversible PWM rectifier 11, and the battery 2 form a first dc discharging circuit, and the dc power consuming device, the second winding unit N2, the reversible PWM rectifier 11, and the battery 2 form a second dc discharging circuit; the dc power device, the first winding unit N1, the second winding unit N2, the reversible PWM rectifier 11, and the battery 2 form a third dc discharge circuit, and the first dc discharge circuit, the second dc discharge circuit, or the third dc discharge circuit may be selected according to different requirements.

In the present embodiment, a dc discharge energy storage loop and a dc discharge energy release loop are formed in the dc discharge circuit, so that the motor coil 12 can output a dc power with voltage reduced, so as to meet the requirement of the dc power device on the charging power.

Further, as an embodiment of the present application, as shown in fig. 5, the charge and discharge connection terminal group 14 in the energy conversion device further includes a fourth charge and discharge connection terminal 144, and the fourth charge and discharge connection terminal 144 is connected to the second bus terminal of the reversible PWM rectifier.

In some examples, the first charge and discharge connection terminal 141 is connected to a first end of the ac port 3, the second charge and discharge connection terminal 142 is connected to a second end of the ac port 3, the third charge and discharge connection terminal 143 is connected to a first end of the dc port 4, the fourth charge and discharge connection terminal is connected to a second end of the dc port 4, when the AC port 3 is connected with the AC power supply equipment, the AC power supply equipment and the battery 2 form an AC charging circuit through the energy conversion device, when the AC port 3 is connected with the AC electric equipment, the AC electric equipment and the battery 2 form an AC discharge circuit through the energy conversion device, when the direct current port 4 is connected with the direct current supply equipment, the direct current supply equipment and the battery 2 form a direct current charging circuit through the energy conversion device, when the dc port 4 is connected to a dc consumer, the dc consumer forms a dc discharge circuit with the battery 2 via the energy conversion device.

In other examples, the first end of the dc port 4 may be connected to the second charge/discharge connection terminal 142, the third charge/discharge connection terminal 143, the second charge/discharge connection terminal 142 and the third charge/discharge connection terminal 143, when the first end of the dc port 4 may be connected to the second charge-discharge connection terminal 142, the dc port 4 and the first winding unit N1 may form a dc charging circuit or a dc discharging circuit, when the first end of the dc port 4, the third charge-discharge connection terminal N2 and the reversible PWM rectifier 11 are connected, the dc port 4 and the second winding unit N2 and the reversible PWM rectifier 11 may form a dc charging circuit or a dc discharging circuit, when the dc port 4 is connected to the second charge-discharge connection terminal 142 and the third charge-discharge connection terminal 143, the dc port 4, the second charge-discharge connection terminal 142, the third charge-discharge connection terminal 143, and the reversible PWM rectifier 11 form a dc charging circuit or a dc discharging circuit.

It should be noted that the first winding unit N1, the second winding unit N2, and the third winding unit N3 are independent of each other, and may be respectively located in the motor coils 12 of different motors, or may be located in the motor coil 12 of the same motor, for example, when the first winding unit N1 is located in the motor coil 12 of one motor, the second winding unit N2 and the third winding unit N3 may be located in the motor coil 12 of another motor; alternatively, the first winding unit N1, the second winding unit N2 and the third winding unit N3 are in the motor coil 12 of the same motor.

In the present embodiment, by leading out the fourth charging/discharging connection terminal 144 in the energy conversion device, the device can be used to perform charging and/or discharging simultaneously with the dc port 4 and the ac port 3, or the dc port 4 is dc-charged and the ac port 3 is ac-discharged; or the direct current port 4 is subjected to direct current discharge, and the alternating current port 3 is subjected to alternating current charging, so that the application scenes of the energy conversion device are increased, and the flexibility of using the energy conversion device is improved.

Further, as an embodiment of the present application, when the first charge-discharge connection terminal 141 is connected to the first end of the ac port 3, the second charge-discharge connection terminal 142 is connected to the second end of the ac port 3, the third charge-discharge connection terminal 143 is connected to the first end of the dc port 4, the fourth charge-discharge connection terminal is connected to the second end of the dc port 4, the ac port 3 is connected to the ac power supply equipment, and the dc port 4 is connected to the dc power supply equipment, the ac port 3 forms a first ac charging circuit with the battery 2 through the bidirectional arm 13, the first winding unit N1, the reversible PWM rectifier 11, and the energy conversion device, and/or the dc port 4 forms a second dc charging circuit with the battery 2 through the second winding unit N2, the reversible PWM rectifier 11, and the energy conversion device.

When the first charge-discharge connection end 141 is connected to the first end of the ac port 3, the second charge-discharge connection end 142 is connected to the second end of the ac port 3, the third charge-discharge connection end 143 is connected to the first end of the dc port 4, the fourth charge-discharge connection end is connected to the second end of the dc port 4, the ac port 3 is connected to the ac consumer, and the dc port 4 is connected to the dc consumer, the ac port 3 forms a first ac discharge circuit with the battery 2 through the bidirectional bridge arm 13, the first winding unit N1, and the reversible PWM rectifier 11 in the energy conversion device, and/or the dc port 4 forms a second dc discharge circuit with the battery 2 through the second winding unit N2, the reversible PWM rectifier 11 in the energy conversion device.

It should be noted that when one of the ac 3 and dc 3 ports is connected to an electric device and the other is connected to a power supply device, the battery 2 can be charged and discharged by the energy conversion device.

In this embodiment, the energy conversion device is connected to the battery 2, the ac port 3, and the dc port 4, and dc charging or dc discharging and/or ac discharging or ac charging are performed by the energy conversion device, so that the application scenarios of the energy conversion device are increased, the flexibility of using the energy conversion device is improved, and meanwhile, the reversible PWM rectifier 11 and the motor coil 12 are adopted in the driving mode, the ac charging mode, the ac discharging mode, the dc charging mode, and the dc discharging mode, thereby simplifying the circuit structure, and improving the integration level, and further achieving the purposes of volume reduction and cost reduction.

Further, as an embodiment of the present application, the ac port 3 forms a heating circuit with the battery 2 through an energy conversion device; or the direct current port 4 and the battery 2 form a heating circuit through an energy conversion device; or the alternating current port 3 and the direct current port 4 form a heating circuit with the battery 2 through the energy conversion device; alternatively, the battery 2 and the energy conversion means form a heating circuit.

When the direct current port 4 is connected with the direct current power supply equipment, the motor coil 12, the reversible PWM rectifier 11 and the energy storage module form a heating circuit, when the heating mode of the heating circuit is that the direct current power supply equipment outputs current to the energy conversion device, the current flows through the motor coil 12 to enable the motor coil 12 to consume power to generate heat, and the generated heat can be used for heating the battery 2 or the seat waiting heating equipment.

When the ac port 3 is connected to an ac power supply device, the motor coil 12, the bidirectional bridge arm 13, the reversible PWM rectifier 11, and the energy storage module form a heating circuit, and when the ac power supply device outputs current to the energy conversion device, the current flows through the motor coil 12 to consume power of the motor coil 12 to generate heat, and the generated heat may be used to heat the battery 2 or a seat waiting heating device.

When the direct current port 4 is connected with direct current electric equipment, the motor coil 12, the reversible PWM rectifier 11, the bidirectional bridge arm 13 and the energy storage module form a heating circuit, when the battery 2 outputs current to the energy conversion device, the current flows through the motor coil 12 to enable the motor coil 12 to consume power and generate heat, and the generated heat can be used for heating the battery 2 or the seat to wait for heating the equipment.

When the alternating current port 3 is connected with alternating current electric equipment, the motor coil 12, the reversible PWM rectifier 11, the bidirectional bridge arm 13 and the energy storage module form a heating circuit, the heating mode of the heating circuit is that the battery 2 outputs current to the energy conversion device, meanwhile, the motor coil 12 actively injects current, so that the motor coil 12 consumes power to generate heat, and the generated heat can be used for heating the battery 2 or the seat to wait for heating equipment.

In this embodiment, the dc power supply device is connected through the dc port 4, or the dc power device is connected through the dc port 4, and the ac power supply device is connected through the ac port 3, or the ac power device is connected through the ac port 3, or the dc power device is connected through the dc port 4 and the ac power device is connected through the ac port 3, and the power is taken from the dc power device or the ac power device, so that the motor coil 12 consumes power and generates heat, and the medium in the cooling circuit passing through the motor coil 12 is heated, so that the heated medium heats other modules when flowing through other modules through the cooling circuit.

Further, as an embodiment of the present application, when the ac port 3 forms a heating circuit with the battery 2 through the energy conversion device, the reversible PWM rectifier makes the ac charging circuit and the heating circuit cooperate with each other, or makes the driving circuit and the heating circuit cooperate with each other, or makes the ac charging circuit, the heating circuit, and the driving circuit cooperate with each other, and makes the ac discharging circuit and the heating circuit cooperate with each other, or makes the ac discharging circuit, the heating circuit, and the driving circuit cooperate with each other, in accordance with an external control signal.

When the dc port 4 forms a heating circuit with the battery 2 through the energy conversion device, the reversible PWM rectifier makes the dc charging circuit and the heating circuit cooperate with each other, or makes the driving circuit and the heating circuit cooperate with each other, or makes the dc charging circuit, the heating circuit, and the driving circuit cooperate with each other, makes the dc discharging circuit and the heating circuit cooperate with each other, or makes the dc discharging circuit, the heating circuit, and the driving circuit cooperate with each other, according to an external control signal.

When the AC port 3 and the DC port 4 form a heating circuit with the battery 2 via the energy conversion device, the reversible PWM rectifier cooperates the DC charging circuit, the AC charging circuit, and the heating circuit, or cooperates the driving circuit and the heating circuit, or cooperates the DC charging circuit, the AC charging circuit, the heating circuit, and the driving circuit, cooperates the DC discharging circuit, the AC charging circuit, and the heating circuit, or cooperates the DC discharging circuit, the AC charging circuit, the heating circuit, and the driving circuit, or cooperates the DC charging circuit, the AC discharging circuit, and the heating circuit, or cooperates the DC charging circuit, the AC discharging circuit, the heating circuit, and the driving circuit, cooperates the DC discharging circuit, the AC discharging circuit, and the heating circuit, or cooperates the DC discharging circuit, The alternating current discharge circuit heating circuit and the driving circuit work cooperatively.

When the battery and the energy conversion device form a heating circuit, the reversible PWM rectifier enables the driving circuit and the heating circuit to work cooperatively according to an external control signal.

In this embodiment, a plurality of heating circuits can be formed by using the energy conversion device, so that different heating circuits can be selected for heating under different conditions, application scenarios of the energy conversion device are increased, and functions of the energy conversion device are more comprehensive.

Further, as an embodiment of the present application, as shown in fig. 7, the energy conversion apparatus further includes a first capacitor C1 and/or a second capacitor.

Specifically, the first capacitor C1 is connected between the first bus end of the reversible PWM rectifier and the second bus end of the reversible PWM rectifier, and the second capacitor C2 is connected between the third charge-discharge connection terminal 141 and the fourth charge-discharge connection terminal 142.

In the present embodiment, the first capacitor C1 is disposed in the energy conversion device, so that the dc voltage output by the reversible PWM rectifier 11 and the dc voltage output by the battery 2 can be filtered, and the voltage output by the reversible PWM rectifier 11 can be stored to complete charging of the battery 2, thereby effectively reducing interference of other noise waves to the charging circuit, the discharging circuit, and the driving circuit. By providing the second capacitor C2 in the energy conversion device, the dc voltage input to the dc port 4 can be filtered, and the dc voltage input to the dc port 4 can be filtered, thereby reducing interference of other noise to the charging circuit or the discharging circuit.

Further, as an embodiment of the present application, as shown in fig. 8, the energy conversion apparatus further includes a first inductor L1 and/or a second inductor L2 and/or a third inductor L3.

Specifically, the first inductor L1 is connected between the midpoint of the bidirectional arm 13 and the first charge/discharge connection terminal 141. The second inductor L2 is connected between the first winding unit N1 and the second charge/discharge connection terminal 142. The third inductor L3 is connected between the second winding unit N2 and the third charge-discharge connection terminal 143.

In this embodiment, by providing the first inductor L1, the second inductor L2, and the third inductor L3 in the energy conversion device, the inductance in the ac charging circuit can be increased, the stored energy is more, the released energy is more, the boosting process in the ac charging circuit is facilitated, and the dc voltage output by the reversible PWM rectifier 11 and the bidirectional bridge arm 13 is increased.

It should be noted that when the second inductor L2 is applied to the first dc charging circuit, the third dc charging circuit or the fourth dc charging circuit, the dc voltage output by the reversible PWM rectifier 11 can be increased, and when the third inductor L3 is applied to the second dc charging circuit, the third dc charging circuit or the fourth dc charging circuit, the dc voltage output by the reversible PWM rectifier 11 can be increased.

Further, as an embodiment of the present application, as shown in fig. 9, the energy conversion apparatus further includes a pre-charging arm 16.

Specifically, the pre-charge arm 16 includes a pre-charge switch K2 and a pre-charge resistor R connected in series, and the pre-charge arm 16 is connected in series with the second bus terminal of the reversible PWM rectifier 11.

In some examples, a switch may be disposed between the first terminal of the battery 2 and the first bus terminal of the reversible PWM rectifier 11, and between the second terminal of the battery 2 and the second bus terminal of the reversible PWM rectifier 11, for controlling a conduction state between the first terminal of the battery 2 and the first bus terminal of the reversible PWM rectifier 11, and between the second terminal of the battery 2 and the second bus terminal of the reversible PWM rectifier 11. In addition, the switches between the first end of the battery 2 and the first bus end of the reversible PWM rectifier 11 and between the second end of the battery 2 and the second bus end of the reversible PWM rectifier 11 can cooperate with the pre-charging bridge arm 16 to realize the pre-charging function.

In the present embodiment, taking the application of the pre-charging arm 16 to the energy conversion device shown in fig. 16 as an example, the switch K2 and the resistor R in the energy conversion device form the pre-charging arm 16, before the battery 2 is charged, the switch K1 is opened, the switch K2 and the switch K3 are closed, after the pre-charging is completed, the switch K1 is closed, the switch K2 is opened, and the reversible PWM rectifier 11 provides power to the battery 2 again. The pre-charging is performed through the R, so that the impact of current on the battery 2 is reduced, the circuit is protected, and the failure rate of the energy conversion device is reduced.

Further, as an embodiment of the present application, the bidirectional leg 13 includes a thirteenth power switching unit and a fourteenth power switching unit connected in series.

Specifically, a first end of the thirteenth power switch unit is connected to the first bus end of the reversible PWM rectifier 11, a second end of the thirteenth power switch unit is connected to the first end of the fourteenth power switch unit, a second end of the fourteenth power switch unit is connected to the second bus end of the reversible PWM rectifier 11, and a midpoint formed by connecting the second end of the thirteenth power switch unit and the first end of the fourteenth power switch unit together is connected to the first charge-discharge connection end 141.

In this embodiment, by switching the conduction states of the thirteenth power switch unit and the fourteenth power switch unit, the bidirectional arm 13 can be matched with each arm in the reversible PWM rectifier 11, and each arm in the reversible PWM rectifier 11 and the bidirectional arm 13 form a rectifier bridge to convert the ac power into the dc power to charge the battery 2.

Further, as an embodiment of the present application, the reversible PWM rectifier 11 includes a set of M₁Road bridge arm, a set of M₁The first ends of each of the plurality of arms are connected together to form a first bus end of the reversible PWM rectifier 11, and a group M of the first bus ends₁The second ends of each of the plurality of legs are connected together to form a second bus end of the reversible PWM rectifier 11.

The first winding unit N1 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 branchesThe coil branches are also respectively connected with n in other phase windings₁One of the coil branches is connected to form n₁A connection point from n₁In one connection point form T₁A neutral point, from T₁Neutral point lead-out J₁A neutral line of m wherein₁≥2，n₁≥T₁≥1，T₁≥J₁N is not less than 1₁，m₁，T₁，J₁Are all positive integers.

The second winding element N2 comprises 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 T₂A connection point from T₂In each connection point form n₂A neutral point, from n₂Neutral point lead-out J₂A neutral line of m wherein₂≥2，M₁≥m₁+m₂，n₂≥T₂≥1，T₂≥J₂N is not less than 1₂，m₂，M₁，J₂Are all positive integers.

Wherein, J₁The neutral line is connected with the second charge-discharge connection end 142, J₂The neutral line is connected to the third charge/discharge connection terminal 143.

It should be noted that, in the present embodiment, n₁≥T₁≥1，T₁≥J₁≥1

In this embodiment, different coil branches formed in the first winding unit N1 and the second winding unit N2 are provided, so that the equivalent phase inductance of the motor is different and the current flows in the motor are different, the required charging power and inductance can be obtained, and the charging power and the charging and discharging performance are improved.

It should be noted that in some examples, switches may be disposed between the first charge and discharge port 141 and the midpoint of the bidirectional bridge arm 13, between the second charge and discharge connection end 142 and the first winding unit N1, between the third charge and discharge connection end 143 and the second winding unit N2, and between the fourth charge and discharge connection end 144 and the second bus end of the reversible PWM rectifier 11, for controlling conduction states between the first charge and discharge port 141 and the midpoint of the bidirectional bridge arm 13, between the second charge and discharge connection end 142 and the first winding unit N1, between the third charge and discharge connection end 143 and the second winding unit N2, and between the fourth charge and discharge connection end 144 and the second bus end of the reversible PWM rectifier 11, so as to switch the working state of the energy conversion device.

In addition, in some examples, a contactor switch is further disposed between the battery 2 and the motor coil 12, and when the contactor switch is closed, the battery 2, the reversible PWM rectifier 11, and the motor coil 12 may form a driving circuit.

In order to clearly understand the contents of the present invention, the following describes the present invention with some specific circuit structure examples:

as shown in fig. 10, which is an exemplary diagram of a first circuit structure of the present technical solution, the energy conversion device includes a reversible PWM rectifier 11, a motor coil 12, a bidirectional bridge arm 13, and a pre-charging bridge arm 16.

Specifically, the motor coil 12 includes a first winding unit N1 and a second winding unit N2, in which case, the first winding unit N1 includes a set of three-phase windings (a, B, C), each of which includes two coil branches (a1, B1, C1, a2, B2, C2), first ends of the coil branches in each of the phase windings are connected together to form a phase end (in which case, three phase ends are formed), a second end of one of the three-phase windings is connected together with second ends of the coil branches in the other two-phase windings to form two neutral points (N1 and N2, respectively), a first neutral line is led out from one of the two neutral points (in which, N1 and also N2 are provided), the first neutral line is connected to the second end of the ac port 3 through a switch K5, and the second winding unit N2 includes a set of three-phase windings (a fourth phase winding U), A fifth phase winding V and a sixth phase winding W), each phase winding including two coil branches (U1, V1, W1, U2, V2, W2), the first ends of the coil branches in each phase winding being connected together to form a phase end point (at this time, three phase end points are formed), the second end of one coil branch in the three-phase winding being connected together with the second ends of the coil branches in the other two-phase windings to form two neutral points (N3 and N4, respectively), a second neutral line being drawn from one neutral point (N3, or N4, at this time) of the two neutral points, the second neutral line being connected to the second end of the ac port 3 through a switch K6, the reversible PWM rectifier 11 including a set of 6 legs, the three legs in the set of 6 legs being connected to the three phase end points of the first winding unit N1, the three legs in the set of 6 legs being connected to the three phase end points of the second winding unit N2, one by one, the first ends of the arms in the group of 6 arms are connected together to form a first bus end of the reversible PWM rectifier 11, the second ends of the arms in the group of 6 arms are connected together to form a second bus end of the reversible PWM rectifier 11, the first bus end of the reversible PWM rectifier 11 is connected with the first end (positive electrode at this time) of the battery 2 through a switch K1, the pre-charging arm 16 is connected with a switch K1 in parallel, the second bus end of the reversible PWM rectifier 11 is connected with the second end (negative electrode at this time) of the battery 2 through a switch K3, a first capacitor C1 is connected between the first bus end of the reversible PWM rectifier 11 and the second bus end of the reversible PWM rectifier 11, the bidirectional arm 13 comprises a thirteenth power switch unit and a fourteenth power switch unit, the first end of the thirteenth power switch unit is connected with the first bus end of the reversible PWM rectifier 11, and the second end of the fourteenth power switch unit is connected with the second bus end of the reversible PWM rectifier 11, the thirteenth power switch unit and the fourteenth power switch unit are connected together to form a midpoint, and the midpoint is connected to the first end of the ac port 3 through a switch K4.

The group of 6-path bridge arms specifically comprises a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch unit, a sixth power switch unit, a seventh power switch unit, an eighth power switch unit, a ninth power switch unit, a tenth power switch unit, an eleventh power switch unit and a twelfth power switch unit, wherein the midpoints of the first power switch unit and the second power switch unit, the midpoints of the third power switch unit and the fourth power switch unit, and the midpoints of the fifth power switch unit and the sixth power switch unit are respectively connected with three phase end points of the first winding unit N1 in a one-to-one correspondence manner, and the midpoints of the seventh power switch unit and the eighth power switch unit, the ninth power switch unit and the tenth power switch unit, and the eleventh power switch unit and the twelfth power switch unit are respectively connected with three phase end points of the second winding unit N2 The first power switch units are connected in a one-to-one correspondence manner, each first power switch unit comprises a first upper bridge arm VT1 and a first upper bridge diode VD1, each second power switch unit comprises a second lower bridge arm VT2 and a second lower bridge diode VD2, each third power switch unit comprises a third upper bridge arm VT3 and a third upper bridge diode VD3, each fourth power switch unit comprises a fourth lower bridge arm VT4 and a fourth lower bridge diode VD4, each fifth power switch unit comprises a fifth upper bridge arm VT5 and a fifth upper bridge diode 58VD 26, each sixth power switch unit comprises a sixth lower bridge arm VT6 and a sixth lower bridge diode VD6, each seventh power switch unit comprises a seventh upper bridge arm VT7 and a seventh upper bridge diode VD7, each eighth power switch unit comprises an eighth lower bridge arm VT8 and an eighth lower bridge diode VD8, each ninth power switch unit comprises a ninth upper bridge arm VT6 and a ninth upper bridge diode VD9, each tenth power switch unit comprises a tenth lower bridge arm VT10 and a tenth lower bridge diode VD10, the eleventh power switching unit comprises an eleventh upper bridge arm VT11 and an eleventh upper bridge diode VD11, the twelfth power switching unit comprises a twelfth lower bridge arm VT12 and a twelfth lower bridge diode VD12, the thirteenth power switching unit comprises a thirteenth upper bridge arm VT13 and a thirteenth upper bridge diode VD13, and the fourteenth power switching unit comprises a fourteenth lower bridge arm VT14 and a fourteenth lower bridge diode VD 14.

When the ac port 3 of the energy conversion device is connected to the ac power supply equipment, the ac power supply equipment performs ac charging on the energy conversion device, and the implementation process is as follows:

when the energy conversion device is in the first driving circuit, the switch K2, the switch K4, the switch K5 and the switch K6 are disconnected, the switch K1 and the switch K3 are closed, direct current output by the battery 2 is converted into three-phase alternating current through a three-phase bridge arm connected with the first winding unit N1, and the three-phase alternating current is output to the first phase winding A, the second phase winding B and the third phase winding C in the first winding unit N1 to form a first driving circuit, so that the driving process of the motor is realized.

When the energy conversion device is in a second driving loop, the switch K2, the switch K4, the switch K5 and the switch K6 are disconnected, the switch K1 and the switch K3 are closed, direct current output by the battery 2 is converted into three-phase alternating current through a three-phase bridge arm connected with the second winding unit N2, and the three-phase alternating current is output to a fourth-phase winding U, a fifth-phase winding V and a sixth-phase winding W in the second winding unit N2 to form a second driving loop, so that the driving process of the motor is realized.

When the energy conversion device is in a third driving circuit, the switch K2, the switch K4, the switch K5 and the switch K6 are disconnected, the switch K1 and the switch K3 are closed, the direct current output by the battery 2 is inverted into a multi-phase alternating current through a three-phase bridge arm connected with the first winding unit N1 and a three-phase bridge arm connected with the second winding unit N2, and is output to the first phase winding a, the second phase winding B, the third phase winding C in the first winding unit N1 and the fourth phase winding U, the fifth phase winding V and the sixth phase winding W in the second winding unit N2 to form a third driving circuit, so that the driving process of the motor is realized.

When the energy conversion device is in the first alternating current charging circuit, the alternating current port 3 is connected with alternating current power supply equipment, a pre-charging switch K2 and a switch K3 are controlled to be closed, pre-charging of a first capacitor C1 is completed through a pre-charging resistor R, after the pre-charging is completed, a switch K1 is closed, a pre-charging switch K2 is disconnected, a switch K4 and a switch K5 are closed, the alternating current power supply equipment outputs alternating current, the conducting states of a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch unit and a sixth power switch unit are switched, so that the bidirectional bridge arm 13, the first power switch unit and the second power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the third power switch unit and the fourth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the fifth power switch unit and the sixth power switch unit form a rectifying full bridge, the three rectifying full bridges are used for converting alternating current into direct current, meanwhile, an alternating current power supply device, the first winding unit N1, the reversible PWM rectifier 11 and the bidirectional bridge arm 13 form an alternating current charging energy storage loop, the alternating current power supply device, the first winding unit N1, the reversible PWM rectifier 11, the battery 2 and the bidirectional bridge arm 13 form an alternating current charging energy release loop, and the first power switch unit, the third power switch unit and the fifth power switch unit output boosted direct current to charge the battery 2.

When the energy conversion device is in the second alternating current charging circuit, the alternating current port 3 is connected with alternating current power supply equipment, a pre-charging switch K2 and a switch K3 are controlled to be closed, pre-charging of a first capacitor C1 is completed through a pre-charging resistor R, after the pre-charging is completed, a switch K1 is closed, a pre-charging switch K2 is disconnected, a switch K4 and a switch K6 are closed, the alternating current power supply equipment outputs alternating current, and the conduction states of a seventh power switch unit, an eighth power switch unit, a ninth power switch unit, a tenth power switch unit, an eleventh power switch unit and a twelfth power switch unit are switched, so that the bidirectional bridge arm 13, the seventh power switch unit and the eighth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the ninth power switch unit and the tenth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the eleventh power switch unit and the twelfth power switch unit form a rectifying full bridge, the three rectifying full bridges are used for converting alternating current into direct current, meanwhile, an alternating current power supply device, the second winding unit N2, the reversible PWM rectifier 11 and the bidirectional bridge arm 13 form an alternating current charging energy storage loop, the alternating current power supply device, the second winding unit N2, the reversible PWM rectifier 11, the battery 2 and the bidirectional bridge arm 13 form an alternating current charging energy release loop, and the seventh power switch unit, the ninth power switch unit and the eleventh power switch unit output boosted direct current to charge the battery 2.

When the energy conversion device is in the third ac charging circuit, the ac port 3 is connected to the ac power supply apparatus, the precharge switch K2 and the switch K3 are controlled to be closed, the precharge of the first capacitor C1 is completed through the precharge resistor R, after the precharge is completed, the switch K1 is closed, the precharge switch K2 is opened, the switch K4, the switch K5 and the switch K6 are closed, the ac power supply apparatus outputs ac power, and the conduction states of the first power switch unit, the second power switch unit, the third power switch unit, the fourth power switch unit, the fifth power switch unit, the sixth power switch unit, the seventh power switch unit, the eighth power switch unit, the ninth power switch unit, the tenth power switch unit, the eleventh power switch unit and the twelfth power switch unit are switched, so that the bidirectional bridge arm 13, the first power switch unit and the second power switch unit form a rectification full bridge, the bidirectional bridge arm 13, the third power switch unit and the fourth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the fifth power switch unit and the sixth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the seventh power switch unit and the eighth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the ninth power switch unit and the tenth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the eleventh power switch unit and the twelfth power switch unit form a rectifying full bridge, the six rectifying full bridges are used for converting alternating current into direct current, meanwhile, an alternating current charging energy storage loop formed by the alternating current power supply equipment, the first winding unit N1, the second power switch unit, the fourth power switch unit, the sixth power switch unit and the bidirectional bridge arm 13 completes energy storage of the first winding unit N1, an alternating current energy release loop formed by the alternating current power supply equipment, the first winding unit N1, the first power switch unit, the third power switch unit, the fifth power switch unit, the battery 2 and the bidirectional bridge arm 13 completes energy release of the first winding unit N1, an alternating current energy charging energy storage loop formed by the alternating current power supply equipment, the second winding unit N2, the eighth power switch unit, the tenth power switch unit, the twelfth power switch unit and the bidirectional bridge arm 13 completes energy storage of the second winding unit N2, an alternating current energy release loop formed by the alternating current power supply equipment, the second winding unit N2, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the battery 2 and the bidirectional bridge arm 13 completes energy release of the second winding unit N2, and the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, The eleventh power switching unit outputs the boosted dc power to charge the battery 2.

When the energy conversion device is in the fourth ac charging circuit, the ac port 3 is connected to the ac power supply apparatus, the precharge switch K2 and the switch K3 are controlled to be closed, the precharge of the first capacitor C1 is completed through the precharge resistor R, after the precharge is completed, the switch K1 is closed, the precharge switch K2 is opened, the switch K4, the switch K5 and the switch K6 are closed, the ac power supply apparatus outputs ac power, and the conduction states of the first power switch unit, the second power switch unit, the third power switch unit, the fourth power switch unit, the fifth power switch unit, the sixth power switch unit, the seventh power switch unit, the eighth power switch unit, the ninth power switch unit, the tenth power switch unit, the eleventh power switch unit and the twelfth power switch unit are switched, so that the bidirectional bridge arm 13, the first power switch unit and the second power switch unit form a rectification full bridge, the bidirectional bridge arm 13, the third power switch unit and the fourth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the fifth power switch unit and the sixth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the seventh power switch unit and the eighth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the ninth power switch unit and the tenth power switch unit form a rectifying full bridge, the bidirectional bridge arm 13, the eleventh power switch unit and the twelfth power switch unit form a rectifying full bridge, alternating current is converted into direct current by using the six rectifying full bridges, and meanwhile, the alternating current power supply equipment, the first winding unit N1, the second winding unit N2, the second power switch unit, the fourth power switch unit, the sixth power switch unit, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit, The fourteenth power switch unit forms an alternating current charging energy storage loop to complete energy storage of the first winding unit N1 and the second winding unit N2, the alternating current power supply device, the first winding unit N1, the second winding unit N2, the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the battery 2 and the thirteenth power switch unit form an alternating current charging energy release loop, the first winding unit N1 and the second winding unit N2 complete energy release, and the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit and the eleventh power switch unit output boosted direct current to charge the battery 2.

In some examples, the power switch control scheme for the reversible PWM11 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.

For the third alternating current charging circuit and the fourth alternating current charging circuit, the two sets of windings work simultaneously, the same phase control or the wrong phase control can be adopted between the bridge arms connected with each set of winding units, and the wrong phase control mode or the same phase control can also be adopted between each set of windings. For example, control method 1: adopt same phase control between the bridge arm that first winding unit N1 is connected, adopt same phase control between the bridge arm that second winding unit N2 is connected, adopt wrong phase control between the bridge arm that first winding unit N1 is connected and the bridge arm that second winding unit N2 is connected simultaneously, the effect is: the same phase control is adopted by the first winding unit N1 of the motor and the second winding unit N2 of the motor, the current of each phase winding of the motor is basically consistent, the synthesized magnetic field intensity generated by all windings of the same phase 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 consumption of the motor is greatly reduced, and the efficiency during charging and discharging is improved, because the same phase control is adopted between the bridge arms of the first winding unit N1 of the motor and the same phase control is adopted between the bridge arms of the second winding unit N2 of the motor, the equivalent inductance of the windings is smaller, but the wrong phase control is adopted between the bridge arm connected with the first winding unit N1 and the bridge arm connected with the second winding unit N2, the defect that the equivalent inductance of the same phase motor between each set of windings is small can be compensated, preferably, the control method is adopted, namely the equivalent inductance during charging and discharging of the motor is increased, and the efficiency during charging and discharging is improved, or for example, in the control method 2, the phase error control is adopted between the bridge arms connected with the first winding unit N1, the phase error control is adopted between the bridge arms connected with the second winding unit N2, and the phase control is adopted between the bridge arm connected with the first winding unit N1 and the bridge arm connected with the second winding unit N2 at the same time, so that the effects are that: the inductance of the winding is improved to the maximum extent, and the ripple of charge and discharge is reduced, so that the defects are as follows: there is a fluctuating magnetic field and a fluctuating torque, and the motor iron loss increases, reducing the efficiency during charging and discharging.

For example, for the third ac charging circuit, when the same phase control is used between the arms connected to the first winding unit N1, the same phase control is used between the arms connected to the second winding unit N2, and the phase control is used between the arms connected to the first winding unit N1 and the phase control is staggered between the arms connected to the second winding unit N2, the arms in the two winding units operate in the same phase, and the phase control may be staggered between the two windings, specifically, as shown in fig. 11, when the third ac charging circuit is in ac staggered charging in the positive half cycle, and the first winding unit N1 stores energy, the current flow direction when the second winding unit N2 releases energy is: the second lower bridge arm VT2, the fourth lower bridge arm VT4 and the sixth lower bridge arm VT6 are controlled to be conducted, the first upper bridge arm VT1, the third upper bridge arm VT3 and the fifth upper bridge arm VT5 are controlled to be turned off, the seventh upper bridge arm VT7, the ninth upper bridge arm VT9 and the eleventh upper bridge arm VT11 are controlled to be conducted, the eighth lower bridge arm VT8, the tenth lower bridge arm VT10 and the twelfth lower bridge arm VT12 are controlled to be turned off, and the current flows to: alternating current port 3 → switch K5 → first neutral → first winding unit N1 → second lower arm VT2, fourth lower arm VT4, sixth lower arm VT6 → fourteenth lower bridge diode VD14 → switch K4 → alternating current port 3; ac port 3 → switch K6 → second neutral wire → second winding unit N2 → seventh upper bridge diode VD7, ninth upper bridge diode VD9, eleventh upper bridge diode VD11 → switch K1 → battery → switch K3 → fourteenth lower bridge diode VD14 → switch K4 → ac port 3.

As shown in fig. 12, when the third ac charging circuit is in the positive half-cycle ac interleaved charging mode, and the first winding unit N1 is de-energized, the current flowing direction when the second winding unit N2 is storing energy is: the second lower bridge arm VT2, the fourth lower bridge arm VT4 and the sixth lower bridge arm VT6 are turned off, the first upper bridge arm VT1, the third upper bridge arm VT3 and the fifth upper bridge arm VT5 are turned on, the seventh upper bridge arm VT7, the ninth upper bridge arm VT9 and the eleventh upper bridge arm VT11 are controlled to be turned off, the eighth lower bridge arm VT8, the tenth lower bridge arm VT10 and the twelfth lower bridge arm VT12 are controlled to be turned on, and the current flows to: ac port 3 → switch K5 → first neutral wire → first winding unit N1 → first upper bridge diode VD1, third upper bridge diode VD3, fifth upper bridge diode VD5 → switch K1 → battery → switch K3 → fourteenth lower bridge diode VD14 → switch K4 → ac port 3; alternating current port 3 → switch K6 → second neutral wire → second winding unit N2 → eighth lower arm VT8, tenth lower arm VT10, twelfth lower arm VT12 → fourteenth lower bridge diode VD14 → switch K4 → alternating current port 3.

Fig. 13 shows the current flow when the third ac charging circuit is in the negative half-cycle ac interleaved charging mode, and the first winding unit N1 stores energy, and the second winding unit N2 releases energy, and fig. 14 shows the current flow when the third ac charging circuit is in the negative half-cycle ac interleaved charging mode, and the first winding unit N1 releases energy, and the second winding unit N2 stores energy, which is similar to the control process of the positive half-cycle ac interleaved charging mode of the third ac charging circuit, and will not be described herein again.

When the energy conversion device is positioned in the first alternating current discharge circuit, the alternating current port 3 is connected with alternating current electric equipment, a pre-charging switch K2 and a switch K3 are controlled to be closed, pre-charging of a first capacitor C1 is completed through a pre-charging resistor R, after the pre-charging is completed, a switch K1 is closed, a pre-charging switch K2 is disconnected, a switch K4 and a switch K5 are closed, the battery 2 outputs alternating current, the conducting states of a first power switch unit, a second power switch unit, a third power switch unit, a fourth power switch unit, a fifth power switch unit and a sixth power switch unit are switched, so that the bidirectional bridge arm 13, the first power switch unit and the second power switch unit form an inversion full bridge, the bidirectional bridge arm 13, the third power switch unit and the fourth power switch unit form an inversion full bridge, the bidirectional bridge arm 13, the fifth power switch unit and the sixth power switch unit form an inversion full bridge, the three inverter full bridges are utilized to convert direct current into alternating current, meanwhile, the battery 2, the reversible PWM rectifier 11, the first winding unit N1, the alternating current electric equipment and the bidirectional bridge arm 13 form an alternating current discharging energy storage loop, the first winding unit N1, the alternating current electric equipment, the bidirectional bridge arm 13 and the reversible PWM rectifier 11 form an alternating current discharging energy release loop, and the first winding unit N1 outputs the alternating current subjected to voltage reduction to supply power to the alternating current electric equipment.

When the energy conversion device is located in the second alternating current discharge circuit, the alternating current port 3 is connected with alternating current electric equipment, a pre-charge switch K2 and a switch K3 are controlled to be closed, pre-charge of a first capacitor C1 is completed through a pre-charge resistor R, after the pre-charge is completed, a switch K1 is closed, a pre-charge switch K2 is disconnected, a switch K4 and a switch K6 are closed, the battery 2 outputs alternating current, the conduction states of a seventh power switch unit, an eighth power switch unit, a ninth power switch unit, a tenth power switch unit, an eleventh power switch unit and a twelfth power switch unit are switched, so that the bidirectional bridge arm 13, the seventh power switch unit and the eighth power switch unit form an inversion full bridge, the bidirectional bridge arm 13, the ninth power switch unit and the tenth power switch unit form an inversion full bridge, the bidirectional bridge arm 13, the eleventh power switch unit and the twelfth power switch unit form an inversion full bridge, the three inverter full bridges are utilized to convert direct current into alternating current, meanwhile, the battery 2, the reversible PWM rectifier 11, the second winding unit N2, the alternating current electric equipment and the bidirectional bridge arm 13 form an alternating current discharging energy storage loop, the second winding unit N2, the alternating current electric equipment, the bidirectional bridge arm 13 and the reversible PWM rectifier 11 form an alternating current discharging energy release loop, and the second winding unit N2 outputs the alternating current subjected to voltage reduction to supply power to the alternating current electric equipment.

When the energy conversion device is in the third ac discharge circuit, the ac port 3 is connected to the ac electric device, the precharge switch K2 and the switch K3 are controlled to be closed, the first capacitor C1 is precharged through the precharge resistor R, after the precharge is completed, the switch K1 is closed, the precharge switch K2 is opened, the switch K4, the switch K5 and the switch K6 are closed, the ac electric device outputs ac power, and the conduction states of the first power switch unit, the second power switch unit, the third power switch unit, the fourth power switch unit, the fifth power switch unit, the sixth power switch unit, the seventh power switch unit, the eighth power switch unit, the ninth power switch unit, the tenth power switch unit, the eleventh power switch unit and the twelfth power switch unit are switched, so that the bidirectional bridge arm 13, the first power switch unit and the second power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the third power switch unit and the fourth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the fifth power switch unit and the sixth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the seventh power switch unit and the eighth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the ninth power switch unit and the tenth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the eleventh power switch unit and the twelfth power switch unit form an inverter full bridge, the six inverter full bridges are used for converting direct current into alternating current, and meanwhile, an alternating current discharge energy storage loop formed by the battery 2, the first power switch unit, the third power switch unit, the fifth power switch unit, the first winding unit N1, alternating current electric equipment and the bidirectional bridge arm 13 completes energy storage of the first winding unit N1, the second power switch unit, the fourth power switch unit, the sixth power switch unit, the first winding unit N1, the ac electric equipment, and the ac discharge energy release loop formed by the bidirectional bridge arm 13 complete the energy release of the first winding unit N1, the battery 2, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the second winding unit N2, the ac electric equipment, and the ac discharge energy storage loop formed by the bidirectional bridge arm 13 complete the energy storage of the second winding unit N2, the eighth power switch unit, the tenth power switch unit, the twelfth power switch unit, the second winding unit N2, the ac electric equipment, and the ac discharge energy release loop formed by the bidirectional bridge arm 13 complete the energy release of the second winding unit N2, and the first winding unit N1 and the second winding unit N2 output the dc power which is subjected to voltage reduction to supply power to the ac electric equipment.

When the energy conversion device is located in the fourth ac discharge circuit, the ac port 3 is connected to the ac electric device, the precharge switch K2 and the switch K3 are controlled to be closed, the first capacitor C1 is precharged through the precharge resistor R, after the precharge is completed, the switch K1 is closed, the precharge switch K2 is opened, the switch K4, the switch K5 and the switch K6 are closed, the ac electric device outputs ac power, and the conduction states of the first power switch unit, the second power switch unit, the third power switch unit, the fourth power switch unit, the fifth power switch unit, the sixth power switch unit, the seventh power switch unit, the eighth power switch unit, the ninth power switch unit, the tenth power switch unit, the eleventh power switch unit and the twelfth power switch unit are switched, so that the bidirectional bridge arm 13, the first power switch unit and the second power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the third power switch unit and the fourth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the fifth power switch unit and the sixth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the seventh power switch unit and the eighth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the ninth power switch unit and the tenth power switch unit form an inverter full bridge, the bidirectional bridge arm 13, the eleventh power switch unit and the twelfth power switch unit form an inverter full bridge, the six inverter full bridges are used for converting direct current into alternating current, and meanwhile, the battery 2, the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the first winding unit N1 and the second winding unit N2, The energy storage of the first winding unit N1 and the second winding unit N2 is completed by an alternating current discharge energy storage loop formed by the alternating current electric equipment and the bidirectional bridge arm 13, the energy release of the first winding unit N1 and the second winding unit N2 is completed by an alternating current discharge energy release loop formed by the second power switch unit, the fourth power switch unit, the sixth power switch unit, the eighth power switch unit, the tenth power switch unit, the twelfth power switch unit, the first winding unit N1, the second winding unit N2, the alternating current electric equipment and the bidirectional bridge arm 13, and the direct current after voltage reduction is output by the first winding unit N1 and the second winding unit N2 to supply power to the alternating current electric equipment.

For the third ac discharge circuit, when the same phase control is used between the arms connected to the first winding unit N1, the same phase control is used between the arms connected to the second winding unit N2, and the phase error control is used between the arm connected to the first winding unit N1 and the arm connected to the second winding unit N2, the two sets of windings work simultaneously, and the two sets of windings can use the phase error control mode, specifically, as shown in fig. 15, when the third ac discharge circuit is in the positive half cycle ac cross discharge, and the first winding unit N1 releases energy, the current flow direction when the second winding unit N2 stores energy is: the second lower bridge arm VT2, the fourth lower bridge arm VT4 and the sixth lower bridge arm VT6 are controlled to be conducted, the first upper bridge arm VT1, the third upper bridge arm VT3 and the fifth upper bridge arm VT5 are controlled to be turned off, the seventh upper bridge arm VT7, the ninth upper bridge arm VT9 and the eleventh upper bridge arm VT11 are controlled to be conducted, the eighth lower bridge arm VT8, the tenth lower bridge arm VT10 and the twelfth lower bridge arm VT12 are controlled to be turned off, and the current flows to: the first winding unit N1 → the first neutral line → the switch K5 → the ac port 3 → the fourteenth lower bridge arm VT14 → the second lower bridge diode VD2, the fourth lower bridge diode VD4, the sixth lower bridge diode VD6 → the first winding unit N1; the positive pole of the battery → the switch K1 → the seventh upper bridge arm VT7, the ninth upper bridge arm VT9, the eleventh upper bridge arm VT11 → the second winding unit N2 → the second neutral line → the switch K6 → the alternating current port 3 → the fourteenth lower bridge arm VT14 → the switch K3 → the negative pole of the battery.

As shown in fig. 16, when the third ac discharging circuit is in the positive half-cycle ac staggered discharge, and the first winding unit N1 stores energy, the current flow when the second winding unit N2 releases energy is: the second lower bridge arm VT2, the fourth lower bridge arm VT4 and the sixth lower bridge arm VT6 are controlled to be turned off, the first upper bridge arm VT1, the third upper bridge arm VT3 and the fifth upper bridge arm VT5 are controlled to be turned on, the seventh upper bridge arm VT7, the ninth upper bridge arm VT9 and the eleventh upper bridge arm VT11 are controlled to be turned off, the eighth lower bridge arm VT8, the tenth lower bridge arm VT10 and the twelfth lower bridge arm VT12 are controlled to be turned on, and the current flows to: the positive pole of the battery → the switch K1 → the first upper bridge arm VT1, the third upper bridge arm VT3, the fifth upper bridge arm VT5 → the first winding unit N1 → the first neutral line → the switch K5 → the AC port 3 → the switch K4 → the fourteenth lower bridge arm VT14 → the switch K3 → the negative pole of the battery; the second winding unit N2 → the second neutral line → the switch K6 → the ac port 3 → the switch K4 → the fourteenth lower arm VT14 → the eighth lower arm diode VD8, the first upper arm diode, the tenth lower arm diode VD10, the first upper arm diode, the twelfth lower arm diode VD12 → the second winding unit N2.

Fig. 17 shows the current flow direction when the third ac discharging circuit is in the negative half-cycle ac interleaved discharge, and the first winding unit N1 is discharged and the second winding unit N2 is charged, and fig. 18 shows the current flow direction when the third ac discharging circuit is in the negative half-cycle ac interleaved charge, and the first winding unit N1 is charged and the second winding unit N2 is discharged, which is similar to the control process of the positive half-cycle ac interleaved charge of the third ac discharging circuit, and will not be described herein again.

As shown in fig. 19, a second exemplary circuit structure diagram of the present technical solution is different from the first exemplary circuit structure diagram in that a first inductor L1 is disposed between a midpoint of the bidirectional bridge arm 13 and the first charge/discharge connection terminal 141 (the first end of the ac port 3), and by disposing the first inductor L1, an inductance of a charging circuit of any one of the first ac charge/discharge circuit, the second ac charge/discharge circuit, the third ac charge/discharge circuit, and the fourth ac charge/discharge circuit can be increased, which is beneficial to enhancing a boosting effect, increasing a charging power, and enhancing a charging efficiency.

As shown in fig. 20, a third circuit structure example of the present technical solution is different from the first circuit structure example in that a coil branch of a first winding unit N1 in a motor coil 12 is connected together to lead out a neutral line, and a coil branch of a second winding unit N2 is connected together to lead out a neutral line, so that a first ac charging circuit, a second ac charging circuit, and a third ac charging circuit can be implemented, and meanwhile, specific working principles of the first ac charging and discharging circuit, the second ac charging and discharging circuit, the third ac charging and discharging circuit, and the fourth ac charging and discharging circuit have been described in detail in the description of the first circuit structure example, and are not repeated herein.

As shown in fig. 21, a fourth exemplary circuit structure according to the present invention is different from the first exemplary circuit structure in that a second inductor L2 is disposed between the first winding unit N1 and the second charge/discharge connection terminal 142 (the second terminal of the ac port 3), and a third inductor L3 is disposed between the second winding unit N1 and the third charge/discharge connection terminal (the third terminal of the ac port), and by implementing this embodiment, the inductance of any one of the first ac charge/discharge circuit, the second ac charge/discharge circuit, the third ac charge/discharge circuit, and the fourth ac charge/discharge circuit can be increased, which is favorable for increasing the boosting effect, increasing the charging power, and increasing the charging efficiency, and the specific working principles of the first ac charge/discharge circuit, the second ac charge/discharge circuit, the third ac charge/discharge circuit, and the fourth ac charge/discharge circuit have been described in detail in the description of the first exemplary circuit structure, and will not be described in detail herein.

As shown in fig. 22, which is a diagram of a fifth circuit configuration example of the present technical solution, it can be known that the energy conversion apparatus further includes a switch module 15 (here, a switch K10), and the dc port 4 can be dc charged through the energy conversion apparatus.

When the energy conversion device is in a first direct current charging mode, the direct current port 4 is connected with direct current power supply equipment, a precharge switch K2 and a switch K3 are controlled to be closed, a switch K4, a switch K9, a switch K6, a switch K10, a switch K8 and a switch K7 are controlled to be opened, precharge of a first capacitor C1 is completed through a precharge resistor R, after the precharge is completed, a switch K1 is closed, the precharge switch K2 is opened, the direct current power supply equipment outputs direct current, a switch K6 is controlled to be closed, a second winding unit N2 is controlled to precharge a capacitor C2, after the precharge is completed, the switch K6 is opened, the switch K10 and the switch K7 are closed, a first power switch unit, a third power switch unit, a fifth power switch unit are opened, a second power switch unit, a fourth power switch unit and a sixth power switch unit are closed, direct current electric equipment, the first winding unit N1 and the second power switch unit form a direct current energy storage charging loop, the direct current electric equipment, the first winding unit N1 and the fourth power switch unit form a direct current charging energy storage loop, the direct current electric equipment, the first winding unit N1 and the sixth power switch unit form a direct current charging energy storage loop, then the first power switch unit, the third power switch unit and the fifth power switch unit are closed, the second power switch unit, the fourth power switch unit and the sixth power switch unit are opened, the direct current electric equipment, the first winding unit N1, the first power switch unit and the battery 2 form a direct current charging energy release loop, the direct current electric equipment, the first winding unit N1, the third power switch unit and the battery 2 form a direct current charging energy release loop, the direct current electric equipment 4, the first winding unit N1, the fifth power switch unit and the battery 2 form a direct current charging energy release loop, the first power switch unit, the third power switch unit, the direct current electric equipment, the first winding unit N1, the fourth power switch unit form a direct current charging energy storage loop, the direct current electric equipment, the first winding unit N1 and the sixth power switch unit form a direct current charging energy release loop, and the direct current charging energy release loop, The fifth power switch unit outputs boosted direct current, and the boosted direct current is filtered by the first capacitor C1 to charge the battery 2.

When the energy conversion device is in a second direct-current charging mode, the direct-current port 4 is connected with direct-current power supply equipment, a precharge switch K2 and a switch K3 are controlled to be closed, a switch K4, a switch K9, a switch K6, a switch K10, a switch K8 and a switch K7 are controlled to be opened, precharge of a first capacitor C1 is completed through a precharge resistor R, after precharge is completed, a switch K1 is closed, the precharge switch K2 is opened, the direct-current power supply equipment outputs direct current, a switch K6 is controlled to be closed, a second winding unit bridge arm is controlled to precharge the capacitor C2, after precharge is completed, the switches K8 and K7 are closed, a seventh power switch unit, a ninth power switch unit, an eleventh power switch unit, an eighth power switch unit, a tenth power switch unit and a twelfth power switch unit are closed, the direct-current port 4, a second winding unit N2 and an eighth power switch unit form a direct-current charging energy storage loop, and the direct-current port 4, the switch K3, the switch is connected with a second direct-current charging energy storage loop, and the direct-current power switching unit is connected with a second direct-current power supply equipment, The second winding unit N2 and the tenth power switch unit form a dc charging energy storage loop, the dc port 4, the second winding unit N2 and the twelfth power switch unit form a dc charging energy storage loop, then the seventh power switch unit, the ninth power switch unit and the eleventh power switch unit are turned on, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit are turned off, the dc power device, the second winding unit N2, the seventh power switch unit and the battery 2 form a dc discharging energy release loop, the dc power device, the second winding unit N2, the ninth power switch unit and the battery 2 form a dc discharging energy release loop, the dc power device, the second winding unit N2, the eleventh power switch unit and the battery 2 form a dc discharging energy release loop, the seventh power switch unit, the ninth power switch unit and the eleventh power switch unit output boosted dc power, the battery 2 is charged through the filtering process of the first capacitor C1.

When the energy conversion device is in a third direct-current charging mode, the direct-current port 4 is connected with direct-current power supply equipment, the precharge switch K2 and the switch K3 are controlled to be closed, the switch K4, the switch K9, the switch K6, the switch K10, the switch K8 and the switch K7 are controlled to be opened, the precharge of the first capacitor C1 is completed through the precharge resistor R, the switch K1 is closed after the precharge is completed, the precharge switch K2 is opened, the direct-current power supply equipment outputs direct current, the switch K6 is controlled to be closed, the second winding unit bridge arm is controlled to precharge the capacitor C2, the switch K10, the switch K8 and the switch K7 are closed after the precharge is completed, and the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the second power switch unit, the fourth power switch unit, the sixth power switch unit, the eighth power switch unit, The conduction states of the tenth power switch unit and the twelfth power switch unit, the direct current power supply device, the first winding unit N1, the second power switch unit and the fourth power switch unit form a direct current charging energy storage loop to complete energy storage of the first winding unit N1, the direct current power supply device, the second winding unit N2, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit form a direct current charging energy storage loop to complete energy storage of the second winding unit N2, the direct current power supply device, the first winding unit N1, the second power switch unit, the first power switch unit, the third power switch unit, the fifth power switch unit and the battery 2 form a direct current charging energy release loop, the second power switch unit, the fourth power switch unit and the sixth power switch unit output boosted direct current to charge the battery 2, the direct current power supply device, the power supply device, The second winding unit N2, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, and the battery 2 form a dc charging energy release circuit, and the eighth power switch unit, the tenth power switch unit, and the twelfth power switch unit output boosted dc power to charge the battery 2, where at a certain time: the direct-current power supply equipment, the first winding unit N1, the second power switch unit and the fourth power switch unit form a direct-current charging energy storage loop, and the direct-current power supply equipment, the second winding unit N2, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit and the battery 2 form a direct-current charging energy release loop; at another time: the direct-current power supply device, the first winding unit N1, the second power switch unit, the first power switch unit, the third power switch unit, the fifth power switch unit and the battery 2 form a direct-current charging energy release loop, and the direct-current power supply device, the second winding unit N2, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit form a direct-current charging energy storage loop.

When the energy conversion device is in a fourth direct-current charging mode, the direct-current port 4 is connected with direct-current power supply equipment, the precharge switch K2 and the switch K3 are controlled to be closed, the switch K4, the switch K9, the switch K6, the switch K10, the switch K8 and the switch K7 are controlled to be opened, the precharge of the first capacitor C1 is completed through the precharge resistor R, the switch K1 is closed after the precharge is completed, the precharge switch K2 is opened, the direct-current power supply equipment outputs direct current, the switch K6 is controlled to be closed, the second winding unit bridge arm is controlled to precharge the capacitor C2, the switch K10, the switch K8 and the switch K7 are closed after the precharge is completed, and the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the second power switch unit, the fourth power switch unit, the sixth power switch unit and the eighth power switch unit, The tenth power switch unit and the twelfth power switch unit are closed, the direct-current electric equipment, the first winding unit N1 and the second power switch unit form a direct-current charging energy storage loop, the direct-current electric equipment, the first winding unit N1 and the fourth power switch unit form a direct-current charging energy storage loop, the direct-current electric equipment, the first winding unit N1 and the sixth power switch unit form a direct-current charging energy storage loop, the direct-current electric equipment, the second winding unit N2 and the eighth power switch unit form a direct-current charging energy storage loop, the direct-current electric equipment, the second winding unit N2 and the tenth power switch unit form a direct-current charging energy storage loop, the direct-current electric equipment, the second winding unit N2 and the twelfth power switch unit form a direct-current charging energy storage loop, and then the first power switch unit, the third power switch unit, the fifth power switch unit, the second winding unit, the third power switch unit, the fourth power switch, The second power switch unit, the fourth power switch unit and the sixth power switch unit are disconnected, the direct-current electric equipment, the first winding unit N1, the first power switch unit and the battery 2 form a direct-current charging energy release loop, the direct-current electric equipment, the first winding unit N1, the third power switch unit and the battery 2 form a direct-current charging energy release loop, the direct-current electric equipment, the first winding unit N1, the fifth power switch unit and the battery 2 form a direct-current charging energy release loop, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit are disconnected, the direct-current electric equipment, the second winding unit N2, the seventh power switch unit and the battery 2 form a direct-current discharging energy release loop, the direct-current electric equipment, the second winding unit N2, the ninth power switch unit, the fifth power switch unit and the battery 2 form a direct-current discharging energy release loop, The battery 2 forms a direct current discharging energy release loop, the direct current electric equipment, the second winding unit N2, the eleventh power switch unit and the battery 2 form a direct current discharging energy release loop, the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit and the eleventh power switch unit are disconnected to output boosted direct current, and the boosted direct current is filtered by the first capacitor C1 to charge the battery 2.

When the energy conversion device is in a first direct current discharge mode, the direct current port 4 is connected with direct current electric equipment, a pre-charging switch K2 and a switch K3 are controlled to be closed, a switch K4, a switch K9, a switch K6, a switch K10, a switch K8 and a switch K7 are controlled to be opened, pre-charging of a first capacitor C1 is completed through a pre-charging resistor R, after pre-charging is completed, a switch K1 is closed, the pre-charging switch K2 is opened, the direct current electric equipment outputs direct current, a switch K6 is controlled to be closed, a second winding unit bridge arm is controlled to pre-charge the capacitor C2, after pre-charging is completed, the switch K6 is opened, the switch K10 and the switch K7 are closed, the battery 2 outputs direct current, a first power switch unit, a third power switch unit, a fifth power switch unit, a second power switch unit, a fourth power switch unit and a sixth power switch unit are opened, the battery 2, the first power switch unit, the first winding unit N1, The direct current electric equipment forms a direct current charging energy storage loop, the battery 2, the third power switch unit, the first winding unit N1 and the direct current electric equipment form a direct current charging energy storage loop, the battery 2, the fifth power switch unit, the first winding unit N1 and the direct current electric equipment form a direct current charging energy storage loop, then the first power switch unit, the third power switch unit, the fifth power switch unit are disconnected, the second power switch unit, the fourth power switch unit and the sixth power switch unit are closed, the first power switch unit, the first winding unit N1 and the direct current electric equipment form a direct current discharging energy release loop, the third power switch unit, the first winding unit N1 and the direct current electric equipment form a direct current discharging energy release loop, the fifth power switch unit, the first winding unit N1 and the direct current electric equipment form a discharging energy release loop, the first winding unit N1 outputs direct current after voltage reduction, the battery 2 is charged through the filtering process of the first capacitor C1.

When the energy conversion device is in the second direct current discharge mode, the direct current port 4 is connected with direct current electric equipment, the precharge switch K2 and the switch K3 are controlled to be closed, the switch K4, the switch K9, the switch K6, the switch K10, the switch K8 and the switch K7 are controlled to be opened, the precharge of the first capacitor C1 is completed through the precharge resistor R, the switch K1 is closed after the precharge is completed, the precharge switch K2 is opened, the battery 2 outputs direct current, the switch K6 is controlled to be closed, the second winding unit bridge arm is controlled to precharge the capacitor C2, the switch K8 and the switch K7 are closed after the precharge is completed, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit are closed, the battery 2, the seventh power switch unit, the second winding unit N2, The direct-current electric equipment forms a direct-current charging energy storage loop, the battery 2, the ninth power switch unit, the second winding unit N2 and the direct-current electric equipment form a direct-current charging energy storage loop, the battery 2, the eleventh power switch unit, the second winding unit N2 and the direct-current electric equipment form a direct-current charging energy storage loop, then the seventh power switch unit, the ninth power switch unit and the eleventh power switch unit are closed, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit are opened, the eighth power switch unit, the second winding unit N2 and the direct-current electric equipment form a direct-current discharging energy release loop, the tenth power switch unit, the second winding unit N2 and the direct-current electric equipment form a direct-current discharging energy release loop, the twelfth power switch unit, the second winding unit N2 and the direct-current electric equipment form a direct-current discharging energy release loop, the second winding unit N2 outputs the dc power after voltage reduction, and charges the battery 2 after filtering processing by the first capacitor C1.

When the energy conversion device is in a third direct current discharge mode, the pre-charging switch K2 and the switch K3 are controlled to be closed, the switch K4, the switch K9, the switch K6, the switch K10, the switch K8 and the switch K7 are controlled to be opened, the pre-charging of the first capacitor C1 is completed through the pre-charging resistor R, after the pre-charging is completed, the switch K1 is closed, the pre-charging switch K2 is opened, the battery 2 outputs direct current, the switch K6 is controlled to be closed, the second winding unit bridge arm is controlled to pre-charge the capacitor C2, after the pre-charging is completed, the switch K10, the switch K8 and the switch K7 are closed, the first power switch unit, the third power switch unit, the fifth power switch unit, the second power switch unit, the fourth power switch unit and the sixth power switch unit are opened, the battery 2, the first power switch unit, the first winding unit N1 and direct current electric equipment form a direct current charging energy storage loop, and the battery 2, the third power switch unit, the first winding unit N1 and the first winding unit, The direct-current electric equipment forms a direct-current charging energy storage loop, the battery 2, the fifth power switch unit, the first winding unit N1 and the direct-current electric equipment form a direct-current charging energy storage loop, then the first power switch unit, the third power switch unit, the fifth power switch unit are disconnected, the second power switch unit, the fourth power switch unit and the sixth power switch unit are closed, the first power switch unit, the first winding unit N1 and the direct-current electric equipment form a direct-current discharging energy release loop, the third power switch unit, the first winding unit N1 and the direct-current electric equipment form a direct-current discharging energy release loop, the fifth power switch unit, the first winding unit N1 and the direct-current electric equipment form a direct-current discharging energy release loop, the first winding unit N1 outputs the direct current subjected to voltage reduction to charge the battery 2, the seventh power switch unit, the ninth power switch unit, the fifth power switch unit, the third power switch unit, the fifth power switch unit, the direct-current switch unit, the fifth power switch unit, the fourth power switch unit, the sixth power switch unit, the fourth power switch unit, the fifth power switch unit, the fourth power switch unit, the direct-current electric equipment, the fourth power switch unit, the direct-current electric equipment, the fifth power switch unit, the fifth power switch unit, the direct-current electric equipment, the fifth power unit, the direct-current electric equipment, the direct, The eleventh power switch unit is turned off, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit are turned on, the battery 2, the seventh power switch unit, the second winding unit N2 and the DC electric equipment form a DC charging energy storage loop, the battery 2, the ninth power switch unit, the second winding unit N2 and the DC electric equipment form a DC charging energy storage loop, the battery 2, the eleventh power switch unit, the second winding unit N2 and the DC electric equipment form a DC charging energy storage loop, then the seventh power switch unit, the ninth power switch unit and the eleventh power switch unit are turned on, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit are turned off, the eighth power switch unit, the second winding unit N2 and the DC electric equipment form a DC discharging energy release loop, and the tenth power switch unit, The second winding unit N2 and the dc power consuming device form a dc discharging energy release loop, the twelfth power switch unit, the second winding unit N2 and the dc power consuming device form a dc discharging energy release loop, and the second winding unit N2 outputs the dc power after voltage reduction to charge the battery 2.

When the energy conversion device is in a third direct current discharge mode, the pre-charging switch K2 and the switch K3 are controlled to be closed, the switch K4, the switch K9, the switch K6, the switch K10, the switch K8 and the switch K7 are controlled to be opened, the pre-charging of the first capacitor C1 is completed through the pre-charging resistor R, after the pre-charging is completed, the switch K1 is closed, the pre-charging switch K2 is opened, the battery 2 outputs direct current, the switch K6 is controlled to be closed, the bridge arm of the second winding unit is controlled to pre-charge the capacitor C2, after the pre-charging is completed, the switch K10, the switch K8 and the switch K7 are closed, and the conduction states of the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the second power switch unit, the fourth power switch unit, the sixth power switch unit, the eighth power switch unit, the tenth power switch unit and the twelfth power switch unit are switched, the battery 2, the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, the eleventh power switch unit, the first winding unit N1, the second winding unit N2 and the dc electric equipment form a dc discharge energy storage loop, the second power switch unit, the fourth power switch unit, the sixth power switch unit, the eighth power switch unit, the tenth power switch unit, the twelfth power switch unit, the first winding unit N1, the second winding unit N2 and the dc electric equipment form a dc discharge energy release loop, and the first winding unit N1 and the second winding unit N2 output the stepped-down dc power to supply power to the dc electric equipment, wherein the dc discharge energy release loop is formed by the battery, the first power switch unit, the third power switch unit, the fifth power switch unit, the seventh power switch unit, the ninth power switch unit, the first winding unit N1, the second winding unit N2 and the dc electric equipment. At a certain moment, the battery 2, the first power switch unit, the first winding unit N1 and the dc electric equipment form a dc charging energy storage loop, the battery 2, the third power switch unit, the first winding unit N1 and the dc electric equipment form a dc charging energy storage loop, the battery 2, the fifth power switch unit, the first winding unit N1 and the dc electric equipment form a dc charging energy storage loop, the eighth power switch unit, the second winding unit N2 and the dc electric equipment form a dc discharging energy release loop, the tenth power switch unit, the second winding unit N2 and the dc electric equipment form a dc discharging energy release loop, and the twelfth power switch unit, the second winding unit N2 and the dc electric equipment form a dc discharging energy release loop; at another time: the battery 2, the seventh power switch unit, the second winding unit N2 and the dc electric device form a dc charging energy storage loop, the battery 2, the ninth power switch unit, the second winding unit N2 and the dc electric device form a dc charging energy storage loop, the battery 2, the eleventh power switch unit, the second winding unit N2 and the dc electric device form a dc charging energy storage loop, the first power switch unit, the first winding unit N1 and the dc electric device form a dc discharging energy release loop, the third power switch unit, the first winding unit N1 and the dc electric device form a dc discharging energy release loop, and the fifth power switch unit, the first winding unit N1 and the dc electric device form a dc discharging energy release loop.

In the technical solution shown in the fifth exemplary circuit configuration, the first ac charging circuit and the second dc charging circuit may be performed simultaneously, or the first ac discharging circuit and the second dc discharging circuit may be performed simultaneously, or any one of the first dc charging/discharging circuit, the second dc charging/discharging circuit, the third dc charging/discharging circuit, the fourth dc charging/discharging circuit, the first ac charging/discharging circuit, the second ac charging/discharging circuit, the third ac discharging/charging circuit, and the fourth ac charging/discharging circuit may be selected.

As shown in fig. 23, a sixth exemplary circuit structure of the present invention is different from the fifth exemplary circuit structure in that a second inductor L2 is disposed between the first winding unit N1 and the second charge/discharge connection terminal 142 (the second terminal of the ac port 3 and the first terminal of the dc port), a third inductor L3 is disposed between the second winding unit N2 and the third charge/discharge connection terminal 143 (the second terminal of the ac port 3 and the first terminal of the dc port 4), through setting up second inductance L2 and third inductance L3, can effectively promote the charging circuit of arbitrary one in first direct current charging circuit, the second direct current charging circuit, third direct current charging circuit, fourth alternating current charging circuit, first alternating current charging circuit, second alternating current charging circuit, third alternating current charging circuit, the fourth alternating current charging circuit and boost, reduce the charge-discharge ripple.

As shown in fig. 24, which is an exemplary diagram of a seventh circuit structure of the present disclosure, the difference between the exemplary diagram of the seventh circuit structure and the exemplary diagram of the fifth circuit structure is that a second inductor L2 is disposed between the first winding unit N1 and the second charge-discharge connection terminal 142 (the second terminal of the ac port 3, the first terminal of the dc port), and by disposing the second inductor L2, the charging circuit of any one of the first dc charging circuit, the third dc charging circuit, the first ac charging circuit, the third ac charging circuit, and the fourth ac charging circuit can be effectively boosted to reduce charge-discharge ripple.

As shown in fig. 25, an eighth exemplary circuit structure of the present disclosure is different from the fifth exemplary circuit structure in that a switch module 15 is not disposed between the second charge/discharge connection terminal 142 (the second terminal of the ac port 3, the first terminal of the dc port) and the third charge/discharge connection terminal 143 (the second terminal of the ac port 3, the first terminal of the dc port 4), and at this time, the first dc charging circuit and/or the third ac charging circuit can be selected to charge the battery 2 or the first dc discharging circuit and/or the third ac discharging circuit can be selected to discharge the battery 2 by switching a switch in the energy conversion apparatus.

As shown in fig. 26, which is a ninth circuit structure example of the present technical solution, the ninth circuit structure example differs from the eighth circuit structure example in that a first inductor L1 is disposed between a midpoint of the bidirectional bridge arm 13 and the first charge-discharge connection terminal 141 (a first end of the ac port 3), a third inductor L3 is disposed between the second winding unit N2 and the third charge-discharge connection terminal 143 (a first end of the dc port 4), and by disposing the first inductor L1 and the third inductor L3, the second dc charging circuit and/or the first ac charging circuit can be effectively boosted to reduce charge-discharge ripples.

As shown in fig. 27, which is a tenth exemplary circuit structure of the present technical solution, the tenth exemplary circuit structure differs from the eighth exemplary circuit structure in that a second inductor L2 is disposed between the first winding unit N1 and the second charge-discharge connection terminal 142 (the second terminal of the ac port 3), a third inductor L3 is disposed between the second winding unit N2 and the third charge-discharge connection terminal 143 (the first terminal of the dc port 4), and by disposing the second inductor L2 and the third inductor L3, the second dc charging circuit and/or the first ac charging circuit can be effectively boosted to reduce charge-discharge ripples.

When m is shown in FIG. 28₁＝m₂＝3，M＝6，n₁＝n₂In the case of the motor coil 11 of fig. 2, the first winding unit N1 forms 2 connection points, the first neutral line is drawn from one of the 2 connection points, the second winding unit N2 forms 2 connection points, and the second neutral line is drawn from one of the 2 connection points, so that the charging is performed by using one coil branch of the three-phase winding, and the driving is performed by using two coil branches of the three-phase winding, as shown in fig. 29, when m is m, the motor coil 11 is driven₁＝m₂＝3，M＝6，n₁＝n₂When 2, the first winding unit N1 forms 2 connection points, the seventh neutral line is led out after the 2 connection points are connected in common, the second winding unit N2 forms 2 connection points, and the eighth neutral line is led out after the 2 connection points are connected in common, so that two coil branches in the three-phase winding are utilized when charging and driving are carried out, different schemes can be applied to different scenes by the energy conversion device, and the use flexibility of the energy conversion device is improved.

In the embodiment, by using the energy conversion device including the reversible PWM rectifier 11, the motor coil 12, the bidirectional bridge arm 13, the charge/discharge connection terminal group 14, and the switch module 15, after the energy conversion device is connected to the external ac port 3 and the external battery 2, the energy conversion device can be selectively operated in any one of the first dc charge/discharge circuit, the second dc charge/discharge circuit, the third dc charge/discharge circuit, the fourth dc charge/discharge circuit, the first ac charge/discharge circuit, the second ac charge/discharge circuit, the third ac charge/discharge current, the fourth ac charge/discharge circuit, the first drive circuit, the second drive circuit, and the third drive circuit, and by implementing the switch module 15, the energy conversion device can be simultaneously dc charged and ac charged, and can be simultaneously dc discharged and ac discharged, the charging and discharging can be simultaneously carried out, and meanwhile, the reversible PWM rectifier 11 and the motor coil 12 are adopted in the circuits, so that the circuit structure is simplified, the integration level is improved, the purposes of volume reduction and cost reduction are achieved, and the problems that the existing overall control circuit comprising the battery 2 charging circuit and the motor driving circuit is complex in structure, low in integration level, large in size and high in cost are solved. In addition, a multi-phase coil branch is arranged in each phase coil in the motor coil 11, and a part of coil branches or all the coil branches in the multi-phase coil respectively form a first winding unit N1 and a second winding unit N2, so that the inductance in use is increased, the winding inductance of the motor 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.

In another embodiment of the present application, a vehicle is provided, and an electric vehicle further includes the energy conversion device provided in the above embodiment.

As shown in fig. 30, 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, comprising:

the first end of an external alternating current port is connected with the first charging and discharging connection end, and the second end of the alternating current port is connected with the second charging and discharging connection end.

2. The energy conversion device of claim 1, wherein a first terminal of an external battery is connected to a first bus of the reversible PWM rectifier, a second terminal of the battery is connected to a second bus of the reversible PWM rectifier, and the battery, the reversible PWM rectifier and the motor coil in the energy conversion device form a driving circuit.

3. The energy conversion device of claim 2, wherein the second end of the ac port is further connected to the third charge-discharge connection;

the alternating current port and the battery form a first alternating current charging circuit through the energy conversion device or the battery and the alternating current port form a first alternating current discharging circuit through the energy conversion device, the alternating current port and the battery form a second alternating current charging circuit through the energy conversion device or the battery and the alternating current port form a second alternating current discharging circuit through the energy conversion device, the alternating current port and the battery form a third alternating current charging circuit through the energy conversion device or the battery and the alternating current port form a third alternating current discharging circuit through the energy conversion device, and the alternating current port and the battery form a fourth alternating current charging circuit through the energy conversion device or the battery and the alternating current port form a fourth alternating current discharging circuit through the energy conversion device.

4. The energy conversion device according to claim 3, wherein when an ac power supply device is connected to the ac port, the ac power supply device, the first winding unit, the reversible PWM rectifier, the battery, and the bidirectional bridge arm form a first ac charging circuit;

or the alternating current power supply equipment, the second winding unit, the reversible PWM rectifier, the battery and the bidirectional bridge arm form a second alternating current charging circuit;

or, the alternating-current power supply equipment, the bidirectional bridge arm, the first winding unit, the second winding unit, the reversible PWM rectifier and the battery form a third alternating-current charging circuit

Or the alternating current power supply device, the first winding unit, the second winding unit, the reversible PWM rectifier, the battery, and the bidirectional bridge arm form a fourth alternating current charging circuit;

5. The energy conversion device according to claim 4, wherein when the energy conversion device selects the first ac charging circuit according to an external control signal, the ac power supply device, the first winding unit, the reversible PWM rectifier, and the bidirectional bridge arm form an ac charging energy storage loop, and the ac power supply device, the first winding unit, the reversible PWM rectifier, the battery, and the bidirectional bridge arm form an ac charging energy release loop;

when the energy conversion device selects the second alternating current charging circuit according to an external control signal, the alternating current power supply equipment, the second winding unit, the reversible PWM rectifier and the bidirectional bridge arm form an alternating current energy storage loop, and the alternating current power supply equipment, the second winding unit, the reversible PWM rectifier, the battery and the bidirectional bridge arm form an alternating current charging energy release loop;

when the energy conversion device selects the third alternating current charging circuit according to an external control signal, the alternating current power supply equipment, the first winding unit, the reversible PWM rectifier and the bidirectional bridge arm form an alternating current charging energy storage loop, and the alternating current power supply equipment, the second winding unit, the reversible PWM rectifier, the battery and the bidirectional bridge arm form an alternating current charging energy release loop; or the alternating current power supply equipment, the second winding unit, the reversible PWM rectifier and the bidirectional bridge arm form an alternating current charging energy storage loop, and the alternating current power supply equipment, the first winding unit, the reversible PWM rectifier, the battery and the bidirectional bridge arm form an alternating current charging energy release loop;

when the energy conversion device selects the fourth alternating current charging circuit according to an external control signal, the alternating current power supply equipment, the first winding unit, the second winding unit, the reversible PWM rectifier and the bidirectional bridge arm form an alternating current charging energy storage loop, and the alternating current power supply equipment, the first winding unit, the second winding unit, the reversible PWM rectifier, the battery and the bidirectional bridge arm form an alternating current charging energy release loop.

6. The energy conversion device according to claim 3, wherein when an ac consumer is connected to the ac port, the battery, the reversible PWM rectifier, the first winding unit, the ac consumer, and the bidirectional leg form a first ac discharge circuit;

or the battery, the reversible PWM rectifier, the second winding unit, the AC electric equipment and the bidirectional bridge arm form a second AC discharging circuit;

or the battery, the reversible PWM rectifier, the first winding unit, the second winding unit, the AC electric equipment and the bidirectional bridge arm form a third AC discharge circuit

Or the battery, the reversible PWM rectifier, the first winding unit, the second winding unit, the ac consumer, and the bidirectional bridge arm form a fourth ac discharge circuit;

7. The energy conversion device according to claim 6, wherein when the energy conversion device selects the first ac discharge circuit according to an external control signal, the battery, the reversible PWM rectifier, the first winding unit, the ac electric device, and the bidirectional arm form an ac discharge energy storage circuit, and the reversible PWM rectifier, the first winding unit, the ac electric device, and the bidirectional arm form an ac discharge energy release circuit;

when the energy conversion device selects the second alternating current discharge circuit according to an external control signal, the battery, the reversible PWM rectifier, the second winding unit, the alternating current electric equipment and the bidirectional bridge arm form an alternating current discharge energy storage loop, and the reversible PWM rectifier, the second winding unit, the alternating current electric equipment and the bidirectional bridge arm form an alternating current discharge energy release loop;

when the energy conversion device selects the third alternating current discharge circuit according to an external control signal, the battery, the reversible PWM rectifier, the first winding unit, the alternating current electric equipment and the bidirectional bridge arm form an alternating current discharge energy storage loop, and the reversible PWM rectifier, the second winding unit, the alternating current electric equipment and the bidirectional bridge arm form an alternating current discharge energy release loop; or the battery, the reversible PWM rectifier, the second winding unit, the ac electric device, and the bidirectional bridge arm form an ac discharge energy storage circuit, and the reversible PWM rectifier, the first winding unit, the ac electric device, and the bidirectional bridge arm form an ac discharge energy release circuit;

when the energy conversion device selects the fourth alternating current discharge circuit according to an external control signal, the battery, the reversible PWM rectifier, the first winding unit, the second winding unit, the alternating current electric equipment and the bidirectional bridge arm form an alternating current discharge energy storage loop, and the reversible PWM rectifier, the first winding unit, the second winding unit, the alternating current electric equipment and the bidirectional bridge arm form an alternating current discharge energy release loop.

8. The energy conversion device according to claim 1, further comprising a switch module, wherein the charge/discharge connection terminal group further includes a fourth charge/discharge connection terminal, the fourth charge/discharge connection terminal is connected to the second bus terminal of the reversible PWM rectifier, the switch module is connected between the second charge/discharge connection terminal and the third charge/discharge connection terminal, and the switch module is configured to control a conduction state between the second charge/discharge connection terminal and the third charge/discharge connection terminal.

9. The energy conversion device according to claim 8, wherein a first end of an external dc port is connected to the third charge-discharge connection terminal, the first end of the dc port is connected to the second charge-discharge connection terminal through the switch module, and a second end of the dc port is connected to the fourth charge-discharge connection terminal;

the alternating current port forms an alternating current charging circuit with a battery through the energy conversion device or the battery forms an alternating current discharging circuit with the alternating current port through the energy conversion device, the direct current port forms a first direct current charging circuit with the battery through the first winding unit, the reversible PWM rectifier and the battery in the energy conversion device or the battery forms a first direct current discharging circuit through the first winding unit, the reversible PWM rectifier and the direct current port in the energy conversion device, the direct current port forms a second direct current charging circuit with the battery through the second winding unit, the reversible PWM rectifier and the second winding unit in the energy conversion device or the battery forms a second direct current discharging circuit through the second winding unit, the reversible PWM rectifier and the direct current port in the energy conversion device, and the direct current port passes through the first winding unit, the reversible PWM rectifier and the direct current port in the energy conversion device, The second winding unit, the reversible PWM rectifier and the battery form a third direct current charging circuit or a fourth direct current charging circuit, and the battery forms a third direct current discharging circuit or a fourth direct current discharging circuit through the reversible PWM rectifier, the first winding unit, the second winding unit and the direct current port in the energy conversion device.

10. The energy conversion device according to claim 9, wherein when a dc power supply device is connected to the dc port, the dc power supply device forms a first dc charging circuit with the battery through the first winding unit, the reversible PWM rectifier and the battery in the energy conversion device;

or, the dc power supply device forms a second dc charging circuit with the battery through the second winding unit, the reversible PWM rectifier and the energy conversion device;

or, the dc power supply device forms a third dc charging circuit with the battery through the first winding unit, the second winding unit, the reversible PWM rectifier and the energy conversion device;

or, the dc power supply device forms a fourth dc charging circuit with the battery through the first winding unit, the second winding unit, the reversible PWM rectifier and the battery in the energy conversion device;

11. The energy conversion device according to claim 10, wherein when the dc port forms a first dc charging circuit with the battery through the first winding unit, the reversible PWM rectifier and the energy conversion device, the dc power supply device, the first winding unit and the reversible PWM rectifier form a dc charging energy storage loop, and the dc power supply device, the first winding unit, the reversible PWM rectifier and the battery form a dc charging energy release loop;

when the direct current port forms a second direct current charging circuit through the second winding unit, the reversible PWM rectifier and the battery in the energy conversion device, the direct current power supply device, the second winding unit and the reversible PWM rectifier form a direct current charging energy storage loop, and the direct current power supply device, the second winding unit, the reversible PWM rectifier and the battery form a direct current charging energy release loop;

when the direct current port forms a third direct current charging circuit through the first winding unit, the second winding unit, the reversible PWM rectifier and the battery in the energy conversion device, the direct current power supply device, the first winding unit and the reversible PWM rectifier form a direct current charging energy storage loop, and the direct current power supply device, the second winding unit, the reversible PWM rectifier and the battery form a direct current charging energy release loop; or the direct current power supply device, the second winding unit and the reversible PWM rectifier form a direct current charging energy storage loop, and the direct current power supply device, the first winding unit, the reversible PWM rectifier and the battery form a direct current charging energy release loop;

when the dc port forms a fourth dc charging circuit with the battery through the first winding unit, the second winding unit, the reversible PWM rectifier and the battery in the energy conversion device, the dc power supply device, the first winding unit, the second winding unit and the reversible PWM rectifier form a dc charging energy storage loop, and the dc power supply device, the first winding unit, the second winding unit, the reversible PWM rectifier and the battery form a dc charging energy release loop.

12. The energy conversion device according to claim 9, wherein when the dc port is connected to a dc consumer, the battery forms a first dc discharge circuit with the dc consumer through the reversible PWM rectifier, the first winding unit, and the dc consumer in the energy conversion device;

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

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

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

13. The energy conversion device according to claim 12, wherein when the battery forms a first dc discharge circuit through the reversible PWM rectifier, the first winding unit, and the dc electric device in the energy conversion device, the battery, the reversible PWM rectifier, the first winding unit, and the dc electric device form a dc discharge energy storage loop, and the reversible PWM rectifier, the first winding unit, and the dc electric device form a dc discharge energy release loop;

when the battery forms a second direct current discharge circuit through the reversible PWM rectifier, the second winding unit and the direct current electric equipment in the energy conversion device, the battery, the reversible PWM rectifier, the second winding unit and the direct current electric equipment form a direct current discharge energy storage loop, and the reversible PWM rectifier, the second winding unit and the direct current electric equipment form a direct current discharge energy release loop;

when the battery passes through the reversible PWM rectifier, the first winding unit, the second winding unit, the reversible PWM rectifier and the DC power equipment in the energy conversion device to form a third DC discharge circuit, the battery, the reversible PWM rectifier, the first winding unit and the DC power equipment form a DC discharge energy storage loop, and the reversible PWM rectifier, the second winding unit and the DC power equipment form a DC discharge energy release loop; or the battery, the reversible PWM rectifier, the second winding unit, and the dc power consumption device form a dc discharge energy storage loop, and the reversible PWM rectifier, the first winding unit, and the dc power consumption device form a dc discharge energy release loop;

when the battery forms a fourth direct-current discharge circuit through the reversible PWM rectifier, the first winding unit, the second winding unit and the direct-current electric equipment in the energy conversion device, the battery, the reversible PWM rectifier, the first winding unit, the second winding unit and the direct-current electric equipment form a direct-current discharge energy storage loop, and the reversible PWM rectifier, the first winding unit, the second winding unit and the direct-current electric equipment form a direct-current discharge energy release loop.

14. The energy conversion device according to claim 1, wherein the charge and discharge connection terminal group further includes a fourth charge and discharge connection terminal, and the fourth charge and discharge connection terminal is connected to the second bus terminal of the reversible PWM rectifier.

15. The energy conversion device according to claim 14, wherein the external ac port, the energy conversion device, and the battery form a first ac charging circuit or a first ac discharging circuit, and/or the external dc port, the energy conversion device, and the battery form a second dc charging circuit or a second dc discharging circuit; the first end of the alternating current port is connected with the first charging and discharging connection end, the second end of the alternating current port is connected with the second charging and discharging connection end, the first end of the direct current port is connected with the third charging and discharging connection end, and the second end of the direct current port is connected with the fourth charging and discharging connection end.

16. The energy conversion device of claim 9, wherein the ac port forms a heating circuit with the battery through the energy conversion device;

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

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

alternatively, the battery and the energy conversion device form a heating circuit.

17. The energy conversion device according to claim 16, wherein when the ac port forms a heating circuit with an external battery through the energy conversion device, the reversible PWM rectifier causes the ac charging circuit and the heating circuit to cooperate, or causes a driving circuit and the heating circuit to cooperate, or causes the ac charging circuit, the heating circuit, and the driving circuit to cooperate, causes the ac discharging circuit and the heating circuit to cooperate, or causes the ac discharging circuit, the heating circuit, and the driving circuit to cooperate, in accordance with an external control signal;

when the direct current port forms a heating circuit with an external battery through the energy conversion device, the reversible PWM rectifier enables the direct current charging circuit and the heating circuit to work cooperatively according to an external control signal, or enables a driving circuit and the heating circuit to work cooperatively, or enables the direct current charging circuit, the heating circuit and the driving circuit to work cooperatively, enables the direct current discharging circuit and the heating circuit to work cooperatively, or enables the direct current discharging circuit, the heating circuit and the driving circuit to work cooperatively;

when the ac port and the dc port form a heating circuit with the battery through the energy conversion device, the reversible PWM rectifier may cooperate the dc charging circuit, the ac charging circuit, and the heating circuit, or cooperate the driving circuit, and the heating circuit, or cooperate the dc charging circuit, the ac charging circuit, and the heating circuit, or cooperate the dc discharging circuit, the ac charging circuit, and the heating circuit, or cooperate the dc charging circuit, the ac discharging circuit, the heating circuit, or the dc charging circuit, the heating circuit, or the dc charging circuit, the heating circuit, or the heating circuit, or the heating circuit, or the heating circuit, or the heating circuit, the charging circuit, the heating circuit, the charging, The heating circuit and the driving circuit work cooperatively, so that the direct current discharge circuit, the alternating current discharge circuit and the heating circuit work cooperatively, or the direct current discharge circuit, the alternating current discharge circuit, the heating circuit and the driving circuit work cooperatively;

18. The energy conversion device of claim 9, further comprising:

a first capacitor connected between a first bus of the reversible PWM rectifier and a second bus of the reversible PWM rectifier;

and/or the second capacitor is connected between the third charge-discharge connection end and the fourth charge-discharge connection end.

19. The energy conversion device of claim 9, further comprising:

the first inductor is connected between the midpoint of the bidirectional bridge arm and the first charge-discharge connection end;

and/or the second inductor is connected between the first winding unit and the second charging and discharging connection end;

and/or the third inductor is connected between the second winding unit and the third charging and discharging connection end.

20. The energy conversion device of claim 1, further comprising a pre-charge leg comprising a pre-charge switch and a pre-charge resistor connected in series, the pre-charge leg connected in series with the first bus terminal of the reversible PWM rectifier.

21. The energy conversion device according to claim 1, wherein the bidirectional bridge arm includes a thirteenth power switch unit and a fourteenth power switch unit connected in series, a first end of the thirteenth power switch unit is connected to the first bus end of the reversible PWM rectifier, a second end of the fourteenth power switch unit is connected to the second bus end of the reversible PWM rectifier, and a midpoint formed by the thirteenth power switch unit and the fourteenth power switch unit being connected together is connected to the first charge-discharge connection terminal.

22. The energy conversion device of claim 8, wherein the reversible PWM rectifier comprises a set of M₁Road bridge arm, said one group M₁The first ends of each of the bridge arms are connected together to form a first bus end of the reversible PWM rectifier, and the group of M bridge arms₁The second ends of each of the bridge arms are connected in common to form a second bus end of the reversible PWM rectifier;

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 from n₁In one connection point form T₁A neutral point from T₁Neutral point lead-out J₁A neutral line of which n is₁≥T₁≥1，T₁≥J₁N is not less than 1₁，m₁，T₁，J₁Are all positive 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 wire in each coil branchThe coil branches are also respectively connected with n in other phase windings₂One of the coil branches is connected to form n₂A connection point from n₂In one connection point form T₂A neutral point from T₂Neutral point lead-out J₂A neutral line of m wherein₂≥2，M₁≥m₁+m₂，n₂≥T₂≥1，T₂≥J₂N is not less than 1₂，m₂，T₂，M₁，J₂Are all positive integers;

said J₁The neutral line is connected with the second charge-discharge connection end, and J₂The strip neutral line is connected with the third charge-discharge connection end;

all the phase windings of each set are used as a basic unit, and the motor vector control adopted by each basic unit can independently control the motor to run.

23. A vehicle characterized by further comprising the energy conversion apparatus of any one of claims 1 to 22.