CN112224056B

CN112224056B - Vehicle and energy conversion device thereof

Info

Publication number: CN112224056B
Application number: CN201910582139.4A
Authority: CN
Inventors: 潘华; 谢飞跃; 张宇昕; 王宁; 雷野
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-06-30
Filing date: 2019-06-30
Publication date: 2022-12-09
Anticipated expiration: 2039-06-30
Also published as: CN112224056A

Abstract

The disclosure belongs to the technical field of electronics, and provides a vehicle and an energy conversion device thereof. The energy conversion device comprises a motor coil and a bridge arm converter, wherein a first neutral line and a second neutral line are led out of the motor coil, the first neutral line and the second neutral line are respectively connected with a first external charging port and a second external charging port, and the bridge arm converter is connected with the motor coil, an external battery, the first external charging port and the second external charging port. According to the power battery charging circuit, the energy conversion device comprising the motor coil and the bridge arm converter is adopted, so that the motor coil can be led out of the first neutral line and the second neutral line, the first neutral line and the second neutral line are connected with different external charging ports, and then the charging of an external battery by adopting a plurality of sets of motor coils is realized, the applicability of the existing power battery charging circuit is improved, the cost is reduced, and the circuit structure is simple, the integration level is high, and the overcurrent capacity is strong.

Description

Vehicle and energy conversion device thereof

Technical Field

The disclosure belongs to the technical field of electronics, and particularly relates to a vehicle and an energy conversion device thereof.

Background

With the development and rapid popularization of electric vehicles, the charging technology of the power battery of the electric vehicle becomes more and more important, and the charging technology needs to meet the requirements of different users, the adaptability to different power batteries and different charging piles, and the compatibility.

Currently, the conventional power battery charging is generally divided into direct charging and boost charging. When the voltage of the battery pack is lower, direct charging is adopted, namely the positive electrode and the negative electrode of the charging pile are directly connected with the positive bus and the negative bus of the power battery through a contactor or a relay to directly charge the battery, and a voltage boosting or reducing circuit is not arranged in the middle; when battery package voltage ratio was higher, when the highest output voltage who fills electric pile was less than battery package voltage promptly, then adopt to step up and charge, the output voltage who fills electric pile through being equipped with powerful boost circuit promptly steps up the back and charges to the battery package, so will lead to circuit cost to increase.

In order to solve the above problems, in the prior art, a boost circuit composed of a motor and a motor controller is mainly used to complete charging of a power battery. However, although the method can effectively solve the problem of high circuit cost when the power battery is charged in a boosting mode, the method can only realize single-set charging by a single set of motor, and the applicability of the circuit is reduced.

In summary, the conventional power battery charging circuit has a problem of low applicability.

Disclosure of Invention

The present disclosure provides a vehicle and an energy conversion device thereof, which aim to solve the problem of high cost of the existing power battery charging circuit.

The present disclosure is achieved in this way, and a first aspect of the present disclosure provides an energy conversion apparatus including:

a motor coil having one end from which a first neutral line and a second neutral line are drawn, and connected to a first end of a first external charging port through the first neutral line, and connected to a first end of a second external charging port through the second neutral line;

the bridge arm converter is connected with an external battery, the first external charging port and the second external charging port, the bridge arm converter comprises a first-phase bridge arm, a second-phase bridge arm and a third-phase bridge arm which are connected in parallel, and the other end of the motor coil is connected with the first-phase bridge arm, the second-phase bridge arm and the third-phase bridge arm;

the external battery drives the motor through the energy conversion device; the first external charging port and/or the second external charging port are/is externally connected with a power supply, and the external battery is charged through an energy conversion device.

A second aspect of the present disclosure is to provide an energy conversion apparatus, including:

the bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm which are connected in parallel, and the other end of the motor coil is connected with the first phase bridge arm, the second phase bridge arm and the third phase bridge arm; and

a bidirectional bridge arm connected in parallel with the bridge arm converter across an external battery, the bidirectional bridge arm further connected to a second end of the first external charging port and a second end of the second external charging port,

the external battery drives the motor through the energy conversion device, the first external charging port and/or the second external charging port are/is externally connected with a power supply, and the external battery is charged through the energy conversion device.

A third aspect of the present disclosure is also to provide an energy conversion apparatus, including:

a motor coil having a first neutral line and a second neutral line drawn out from one end thereof, and connected to a first end of a first external charging port through the first neutral line, and connected to a first end of a second external charging port through the second neutral line;

the bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm which are connected in parallel, the other end of the motor coil is connected with the first phase bridge arm, the second phase bridge arm and the third phase bridge arm, and the bridge arm converter is also connected with a second end of the first external charging port; and

a bidirectional bridge arm connected in parallel with the bridge arm converter at both ends of an external battery and connected with a second end of the second external charging port;

A fourth aspect of the present disclosure is to provide an energy conversion apparatus, including:

the motor coil is provided with a first neutral line and a second neutral line which are led out from one end of the motor coil, and the first neutral line and the second neutral line are not connected together;

the bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, wherein the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are connected in parallel to form a first current collecting end and a second current collecting end, and the other end of the motor coil is connected with the middle points of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm.

A fifth aspect of the present disclosure is to provide an energy conversion apparatus, comprising:

a motor coil, one end of which leads out a first neutral line and a second neutral line, the first neutral line and the second neutral line being disconnected;

the bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, wherein the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are connected in parallel to form a first current collecting end and a second current collecting end, and the other end of the motor coil is connected with the middle points of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm;

and the bidirectional bridge arm is connected with the bridge arm converter in parallel, and a charging connecting end is led out from the midpoint of the bidirectional bridge arm.

A sixth aspect of the present disclosure is to provide a vehicle including the energy conversion apparatus of any one of the first, second, third, fourth, and fifth aspects described above.

In the disclosure, by adopting the energy conversion device comprising the motor coil and the bridge arm converter, the motor coil can lead out a first neutral line and a second neutral line, and the first neutral line and the second neutral line are connected with different external charging ports, so that the external battery is charged by adopting a plurality of sets of motor coils, the applicability of the existing power battery charging circuit is improved, the cost is reduced, the circuit structure is simple, the integration level is high, the overcurrent capacity is strong, and the problem of low applicability of the existing power battery charging circuit is solved.

Drawings

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

fig. 2 is a schematic block diagram of an energy conversion device according to a second embodiment of the present disclosure;

fig. 3 is a schematic circuit diagram of an energy conversion device according to a third embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a first current path of the energy conversion device of FIGS. 1-3 during operation;

FIG. 5 is a schematic diagram of a second current path during operation of the energy conversion device shown in FIGS. 1-3;

fig. 6 is a timing diagram illustrating a bridge arm converter in an energy conversion apparatus according to a third embodiment of the disclosure when the bridge arm converter operates in a three-phase sequential control manner;

fig. 7 is a timing diagram illustrating a bridge arm converter in an energy conversion apparatus according to a third embodiment of the disclosure when the bridge arm converter operates in a three-phase interleaved control mode;

fig. 8 is a schematic block diagram of an energy conversion device according to a fourth embodiment of the present disclosure;

fig. 9 is a schematic block diagram of an energy conversion device according to a fifth embodiment of the present disclosure;

fig. 10 is a schematic circuit diagram of an energy conversion device according to a fourth embodiment or a fifth embodiment of the present disclosure;

fig. 11 is a schematic diagram of a first current path when the energy conversion device provided by the fourth or fifth embodiment of the present disclosure is in operation;

fig. 12 is a schematic diagram of a second current path when the energy conversion device provided by the fourth or fifth embodiment of the disclosure is in operation;

fig. 13 is a schematic block diagram of an energy conversion device according to a sixth embodiment of the present disclosure;

fig. 14 is a schematic circuit configuration diagram of the energy conversion device shown in fig. 13;

fig. 15 is a schematic circuit configuration diagram of the energy conversion device shown in fig. 9;

fig. 16 is a schematic diagram of another circuit configuration of the energy conversion device shown in fig. 13;

fig. 17 is a schematic block diagram of an energy conversion device according to a seventh embodiment of the present disclosure;

fig. 18 is a schematic block diagram of an energy conversion device according to an eighth embodiment of the present disclosure;

fig. 19 is a schematic circuit configuration diagram of the energy conversion device shown in fig. 17 or 18;

fig. 20 is a schematic circuit configuration diagram of an energy conversion device according to a ninth embodiment of the present disclosure;

fig. 21 is a schematic circuit diagram of an energy conversion device according to a tenth embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more clearly understood, the present disclosure is further described in 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 disclosure and are not intended to limit the disclosure.

Implementations of the present disclosure are described in detail below with reference to the specific figures:

fig. 1 illustrates a module structure of an energy conversion apparatus 100 provided in an embodiment of the present disclosure, and for convenience of description, only the portions related to the embodiment are illustrated, and the details are as follows:

as shown in fig. 1, an energy conversion apparatus 100 provided by the embodiment of the present disclosure includes:

a motor coil 11 having one end from which a first neutral line and a second neutral line are drawn, and connected to a first end of the first external charging port 101 through the first neutral line, and connected to the second external charging port 102 through the second neutral line;

a bridge arm converter 12 connected to an external battery 200, a first external charging port 101, and a second external charging port 102, wherein the bridge arm converter 12 includes a first phase bridge arm a, a second phase bridge arm B, and a third phase bridge arm C connected in parallel, and the other end of the motor coil 11 is connected to the first phase bridge arm a, the second phase bridge arm B, and the third phase bridge arm C;

the external battery 200 drives the motor through the energy conversion device 100; the first external charging port 101 and/or the second external charging port 102 are externally connected to a power source, and the external battery 200 is charged through the energy conversion device 100.

In specific implementation, the first external charging port 101 and the second external charging port 102 in the energy conversion apparatus 100 are both dc charging ports, that is, the energy conversion apparatus 100 is configured to be used for dc charging, the energy conversion apparatus 100 may be connected to an external dc power source through the first external charging port 101 or the second external charging port 102, or through the first external charging port 101 and the second external charging port 102, the dc power source may be a dc power obtained by rectifying an external ac power source through the charging ports, or a dc power input by the external dc power source through the charging ports, and the present disclosure is not limited specifically.

In view of the above, when the energy conversion apparatus 100 operates in the dc charging mode, the energy conversion apparatus can perform dual dc time-sharing charging, and the detailed description of the dual dc time-sharing charging process will be focused on in this disclosure, and specific reference may be made to the following related description, which is not repeated herein; it should be noted that, in the embodiment of the present disclosure, the energy conversion apparatus 100 may also operate in an ac charging mode, which will be described in detail later and will not be described herein again.

In addition, in the present disclosure, "external battery" and "external charging port" described in the present embodiment are "external" with respect to the energy conversion apparatus 100, and are not "external" of the vehicle in which the energy conversion apparatus 100 is located.

In this embodiment, by using the energy conversion device 100 including the motor coil 11 and the bridge arm converter 12, the motor coil 11 can lead out a first neutral line and a second neutral line, and the first neutral line and the second neutral line are connected to different external charging ports, so as to implement dc charging of an external battery by using multiple sets of motor coils, thereby improving the applicability of the existing power battery charging circuit, reducing the cost, and having a simple circuit structure, high integration level and strong overcurrent capability, thereby solving the problem of low applicability of the existing power battery charging circuit.

Further, as an embodiment of the present disclosure, as shown in fig. 1, the bridge arm converter 12 includes a first bus terminal and a second bus terminal, the first bus terminal is connected to a first terminal of the external battery 200, the second bus terminal is connected to the other terminal of the external battery 200, and a second terminal of the first external charging port 101 and a second terminal of the second external charging port are connected to a second bus terminal of the bridge arm converter 12.

Further, as an embodiment of the present disclosure, as shown in fig. 3, the first phase bridge arm a includes a first power switch VT1 and a second power switch VT2 connected in series, and first middle points of the first power switch VT1 and the second power switch VT2 are connected to the first phase coil of the motor coil 11;

the second phase bridge arm B comprises a third power switch VT3 and a fourth power switch VT4 which are connected in series, and second middle points of the third power switch VT3 and the fourth power switch VT4 are connected with a second phase coil of the motor coil 11;

the third phase bridge arm C comprises a fifth power switch VT5 and a sixth power switch VT6 which are connected in series, and third middle points of the fifth power switch VT5 and the sixth power switch VT6 are connected with a third phase coil of the motor coil 11;

the first end of the first power switch VT1, the first end of the third power switch VT3 and the first end of the fifth power switch VT5 are connected together to form a first bus end of the bridge arm converter 12; a second end of the second power switch VT2, a second end of the fourth power switch VT4, and a second end of the sixth power switch VT6 are connected together to form a second bus end of the bridge arm converter 12.

In addition, as shown in fig. 3, the first-phase bridge arm a further includes a first upper bridge diode VD1 and a second lower bridge diode VD2, the second-phase bridge arm B includes a third upper bridge diode VD3 and a fourth lower bridge diode VD4, and the third-phase bridge arm C includes a fifth upper bridge diode VD5 and a sixth lower bridge diode VD6, and specific connection relationships thereof can be referred to fig. 3, which is not described herein again.

In addition, as shown in fig. 3, in the embodiment of the present disclosure, the plurality of switch units included in the bridge arm converter 12 may be implemented by devices capable of performing switching operations, such as a power Transistor, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), and other switch devices.

Further, as an embodiment of the present disclosure, as shown in fig. 3, the energy conversion apparatus 100 further includes a capacitor C1, and the capacitor C1 is connected between the first bus terminal and the second bus terminal.

In specific implementation, when the energy conversion apparatus 100 operates in the dc charging mode, the first capacitor C1 filters the voltage output by the bridge arm converter 12 during the dc charging of the external battery 200, and stores energy according to the voltage output by the bridge arm converter 12, so as to complete the dc charging of the external battery 200.

In this embodiment, the first capacitor C1 is arranged in the energy conversion device 100, so that the first capacitor C1 filters the voltage output by the bridge arm converter 12, and can store energy according to the voltage output by the bridge arm converter 12 to complete the dc charging of the external battery 200, thereby ensuring that the energy conversion device 100 has a normal charging function and other noise waves do not interfere with the charging process; in addition, when the energy conversion apparatus 100 operates in the motor driving mode, the first capacitor C1 may serve as a capacitor of a motor controller, so that the first capacitor C1 may serve as a PFC capacitor and may also serve as a capacitor of the motor controller for multiplexing, thereby improving the utilization rate of electronic components in the energy conversion apparatus 100 and simplifying the structure of the energy conversion apparatus.

Further, as an embodiment of the present disclosure, as shown in fig. 2, the motor coil 11 includes a first coil unit 111 and a second coil unit 112, the first coil unit 111 draws out at least one first neutral wire and is connected to the first external charging port 101 through the first neutral wire, and the second coil unit 112 draws out at least one second neutral wire and is connected to the second external charging port 102 through the second neutral wire.

In specific implementation, one first neutral line may be led out from the first coil unit 111, or a plurality of first neutral lines may be led out from the first coil unit 111, and when a plurality of first neutral lines are led out from the first coil unit 111, the plurality of first neutral lines may be connected to the first external charging port 101 one by one, or may be connected to the first external charging port 101 after being connected in common, in fig. 2, a plurality of first neutral lines are led out from the first coil unit 111, and the plurality of first neutral lines are connected to the first external charging port 101 after being connected in common.

Similarly, one second neutral line may be drawn out of the second coil unit 112, or a plurality of second neutral lines may be drawn out, and when a plurality of second neutral lines are drawn out of the second coil unit 112, the plurality of second neutral lines may be connected to the second external charging port 101 one by one, or may be connected to the second external charging port 101 after being connected in common, and fig. 2 illustrates an example in which a plurality of second neutral lines are drawn out of the second coil unit 112, and the plurality of second neutral lines are connected to the second external charging port 101 after being connected in common.

In this embodiment, the first coil unit and the second coil unit are used to form the motor coil, so that when the energy conversion device 100 is charged by direct current, corresponding direct current charging can be performed through two sets of coil units, and then charging of an external battery by using multiple sets of motor coils is realized, thereby improving the applicability of the existing power battery charging circuit, reducing the cost, and having a simple circuit structure, high integration level, and strong overcurrent capability.

Further, as an embodiment of the present disclosure, as shown in fig. 2, the first coil unit 111 includes N first sub-coil units 111a, the N first sub-coil units 111a lead out at least one first neutral wire, the second coil unit 112 includes M second sub-coil units 112a, the M second sub-coil units 112a lead out at least one second neutral wire; wherein N is an integer not less than 1, and M is an integer not less than 1.

In a specific implementation, at least one first neutral line is led out from the outgoing lines of the first ends of the N first sub-coil units 111a, that is, one line is led out from the first ends of the N first sub-coil units 111a, and the outgoing lines of the first ends of each first sub-coil unit 111a are connected in common to form one first neutral line, or one first neutral line is led out from the first ends of the N first sub-coil units 111a, or one line is led out from the first ends of the N first sub-coil units 111a, so as to form N first neutral lines.

Similarly, at least one second neutral line is led out from the lead-out lines of the second ends of the M second sub-coil units 112a, that is, the second ends of the M second sub-coil units 112a are all led out one line, and the lead-out lines of the second ends of each second sub-coil unit 112a are connected in common to form one second neutral line, or the second ends of the M second sub-coil units 112a are connected in common to be led out one second neutral line, or the second ends of the M second sub-coil units 112a are all led out one line, so as to form M second neutral lines.

In the present embodiment, by providing the first coil unit 111 including a plurality of first sub-coil units 111a and the second coil unit 112 including a plurality of second sub-coil units 112a in the motor coil 11, the motor coil 11 includes a plurality of neutral points, and for each neutral point being a common point of the three-phase motor, the plurality of neutral points means that the motor coil 11 includes a plurality of three-phase inductances, which will enable the motor coil 11 to not only cooperate with other modules in the energy conversion apparatus 100 to perform the driving and charging functions, but also enable the charging with a large current and a large power.

Further, as an embodiment of the present disclosure, a value of N is greater than a value of M.

In this embodiment, different values of N and M are selected, so that on the premise that voltages and currents passing through the two coil units are the same, the overcurrent capacity and the anti-ripple capacity of the first coil unit and the second coil unit are different, and the more the number of the coils is, the smaller the equivalent inductance is, the stronger the overcurrent capacity is, the fewer the number of the coils is, the larger the equivalent inductance is, and the stronger the anti-ripple capacity is, so that different charging loops can be selected according to different requirements.

In addition, when the energy conversion device operates in a heating mode, that is, the heating energy source provides heating energy, and the bridge arm converter 12 performs corresponding switching under the action of the external control module, so that the motor including the motor coil 11 generates heat according to the heating energy to heat the coolant flowing through the power battery, because the heating requirements of the power battery under different working conditions are different, different heating requirements can be met by selecting the number of coil units in the motor coil 11 in the energy conversion device, for example, the number of coil units selected when the heat required by the power battery is larger, that is, the number of coil units selected when the power battery is cold started is increased, and the number of coil units selected when the heat required by the power battery is smaller is correspondingly reduced, compared with the prior art in which the heating power can be effectively adjusted only by using one set of motor coils, and the flexibility is high.

The specific process operation of the energy conversion apparatus 100 provided by the present disclosure when operating in single dc charging and dual dc time-sharing charging is described below by taking the circuit shown in fig. 3 as an example, which is detailed as follows:

first, it should be noted that, in the embodiment of the present disclosure, corresponding switch-on circuits are respectively disposed inside the first external charging port 101 and the second external charging port 101, and the switch-on circuits are used for gating corresponding dc circuits, and specific structures and principles of the switch-on circuits may refer to the existing switch circuits, which are not described herein again; in addition, the first external charging port 101 and the second external charging port 101 in fig. 3 are described by taking a dc charging port as an example, and in fig. 3, three first sub-coil units 111a are taken as an example in the number of the first coil units 111, and one second sub-coil unit 112a is taken as an example in the number of the second coil units 112.

Next, the energy conversion device 100 provided in the embodiment of the present disclosure may also operate in a driving mode, when the energy conversion device 100 operates in the driving mode, the switch-on circuits inside the first external charging port 101 and the second external charging port 102 are in an off state, so as to prevent the external charging port from being electrified during the vehicle driving process, and at this time, the interface circuit of the external battery 200, that is, the connection circuit 13, is in an on state, the battery external 200 supplies power to the arm converter 12, and the arm converter 12 operates according to the power supply of the external battery 200 to drive the three-phase coil of the motor coil 11, so as to convert the electric energy of the battery 200 into the mechanical energy of the motor, thereby implementing the driving function.

Further, when the energy conversion device 100 operates in the DC charging mode, taking the energy conversion device 100 operates in the single DC charging mode as an example, the switch-on circuit inside the first external charging port 101 is in a conducting state, the switch-on circuit inside the second external charging port 102 is in a disconnecting state, at this time, the external DC charging pile outputs a DC power to the motor coil 11 through the first external charging port 101, and the DC power is charged to the external battery 200 under a DC boost circuit formed by the inductance of the motor coil 11 and the three-phase bridge arm of the bridge arm converter 12, thereby implementing the DC boost charging function of the energy conversion device 100; or the switch-on circuit inside the second external charging port 102 is in a conducting state, the switch-on circuit inside the first external charging port 101 is in a disconnecting state, at this time, the external DC charging pile outputs a direct current to the motor coil 11 through the second external charging port 102, and the direct current charges the external battery 200 under a DC boost circuit formed by the inductance of the motor coil 11 and the three-phase arm of the arm converter 12, thereby implementing the function of DC boost charging of the energy conversion device 100.

Specifically, in the direct current charging process, the bridge arm converters 12 may control duty ratios of power switch units in respective bridge arms according to an instruction of a Battery Manager (BMS) to realize matching of input and output voltages, and further complete a core boost control function, that is, the bridge arm converters 12 may control on or off of the power switch units in their own bridge arms, so that the energy storage process of the DC charging pile on the motor coil 11 and the discharging process of the DC charging pile and the motor coil 11 on the external battery 200 are performed alternately, so as to charge the external battery 200 after boosting the direct current of the DC charging pile.

As described above, when the energy conversion device 100 operates in the dc charging mode, the upper arm switching tubes and the lower arm switching tubes of the arm converter 12 are alternately turned on at the same time, and are turned on in the same phase or turned off in different phases, and taking the synchronization of the phases, i.e., VT1, VT3, VT5, VD2, VD4, and VD6 as an example, the current flow direction of the energy conversion device 100 is alternately performed in two modes, i.e., a mode and a mode. Wherein, a is the motor inductance energy storage stage, and the current flow direction of the energy conversion device 100 at this time is: an external power supply positive electrode → the first external charging port 101 → the motor winding → VT2, VT4, VT6 → the first external charging port 101 → the external power supply negative electrode, as shown in fig. 4 specifically; b is a motor inductance follow current stage, and the current flow direction of the energy conversion device 100 at this time is: external power supply positive pole → first external charging port 101 → motor winding → VT1, VT3, VT5 → capacitor C1 positive pole → capacitor C1 negative pole → first external charging port 101 → external power supply negative pole, as shown in fig. 5.

The above-described implementation will describe the operation of the arm converter 12 by taking the example of synchronous control of the power cells in the three-phase arms of the arm converter 12, for example, a control method of a three-phase sequential switch shown in fig. 6. In other embodiments of the present disclosure, a three-phase-staggered control method may also be adopted, that is, the control method is used to control the operation of the bridge arm converter 12 in a three-phase-staggered control manner as shown in fig. 7, so as to weaken the mutual inductance effect between three phases inside the motor, and suppress the reduction of inductance of each phase, thereby further enabling the three-phase current ripples to counteract each other, and effectively improving the waveform of the charging current.

Specifically, when the three-phase-staggered control method is adopted to control the operation of the bridge arm converter 12, the operation process of the bridge arm converter 12 is as follows:

specifically, when the bridge arm converter 12 works, as can be known from the working timing diagram shown in fig. 7, the control signal PWM1 controls on/off of the first power switch VT1 and the second power switch VT2 in the first phase bridge arm a in the bridge arm converter 12, and controls the first power switch VT1 to be on and the second power switch VT2 to be off when the control signal PWM1 is at a high level, and controls the second power switch VT2 to be on and the first power switch VT1 to be off when the control signal PWM1 is at a low level; after a preset phase difference with the control signal PWM1, the control signal PWM2 controls the on/off of the third power switch VT3 and the fourth power switch VT4 in the second phase bridge arm B of the bridge arm converter 12, and controls the third power switch VT3 to be turned on and the fourth power switch VT4 to be turned off at the high level of the control signal PWM2, and controls the fourth power switch VT4 to be turned on and the third power switch VT3 to be turned off at the low level of the control signal PWM 2; and after a preset phase difference with the control signal PWM2, the control signal PWM3 controls on/off of a fifth power switch VT5 and a sixth power switch VT6 in a third phase bridge arm C in the bridge arm converter 12, controls the fifth power switch VT5 to be turned on and the sixth power switch VT6 to be turned off when the control signal PWM3 is at a high level, and controls the sixth power switch VT6 to be turned on and the fifth power switch VT5 to be turned off when the control signal PWM3 is at a low level, thereby realizing three-phase staggered control of the bridge arm controller 120.

In this embodiment, a three-phase interleaved control operation mode is adopted to control a three-phase bridge arm of the bridge arm converter 12, so that when the energy conversion device 100 is charged, an equivalent inductance value is effectively increased, further, the charging power is increased, and an additional inductance does not need to be added between the motor coil 11 and a charging port in the energy conversion device 100, further, the number of electronic components in the energy conversion device 100 is reduced, and the cost of the energy conversion device 100 is reduced.

It should be noted that, the above-mentioned process is to describe the specific principle of the energy conversion device 100 by taking the case that the energy conversion device 100 works in the single-dc charging mode as an example, because the two dc circuits of the energy conversion device 100 have the same structure, and the difference is only that the two dc charging circuits need to be performed in time-sharing mode, i.e., in different time periods, the specific process of the energy conversion device 100 working in the double-dc time-sharing mode can be described with reference to fig. 3 to 7, and is not repeated here; in addition, the energy conversion device 100 can select a corresponding charging loop according to the power level of the charging pile, so that the charging efficiency is improved, and the electric charge is saved.

Further, another energy conversion apparatus 400 is provided in the embodiments of the present disclosure, as shown in fig. 8, where the energy conversion apparatus 400 includes:

a motor coil 11 having one end from which a first neutral line and a second neutral line are drawn, and connected to a first end of the first external charging port 101 through the first neutral line, and connected to a first end of the second external charging port 102 through the second neutral line;

the bridge arm converter 12 comprises a first phase bridge arm A, a second phase bridge arm B and a third phase bridge arm B which are connected in parallel, and the other end of the motor coil 11 is connected with the first phase bridge arm A, the second phase bridge arm B and the third phase bridge arm C; and

a bidirectional arm 13 connected in parallel with the arm converter 12 across the external battery 200, the bidirectional arm 13 further connected to a second terminal of the first external charging port 101 and a second terminal of the second external charging port 102,

the external battery 200 drives the motor through the energy conversion device, and the first external charging port 101 and/or the second external charging port 102 are externally connected with a power supply and charge the external battery 200 through the energy conversion device.

In specific implementation, the first external charging port 101 and the second external charging port in the energy conversion apparatus 400 are both ac charging ports, that is, the energy conversion apparatus 400 is used for ac charging, the energy conversion apparatus 400 may be connected to an external ac power source through the first external charging port 101 or the second external charging port 102, or the first external charging port 101 and the second external charging port 102, the ac power source may be an ac power obtained by inverting an external dc power source through the charging ports, or an ac power input by the external ac power source through the charging ports, and this is not limited specifically here.

As mentioned above, when the energy conversion apparatus 400 operates in the ac charging mode, the energy conversion apparatus can perform dual ac current synchronous charging and dual ac current simultaneous charging, which is specifically referred to the following related description and is not described herein again; it should be noted that, in the embodiment of the present disclosure, the energy conversion apparatus 400 may also operate in an ac/dc charging mode, that is, may perform both ac charging and dc charging, and details will be described later and will not be described herein again.

In addition, in the present disclosure, "external battery" and "external charging port" described in the present embodiment are "external" with respect to the energy conversion apparatus 400, and are not "external" of the vehicle in which the energy conversion apparatus 400 is located.

In this embodiment, by using the energy conversion device 400 including the motor coil 11, the bridge arm converter 12, and the bidirectional bridge arm 13, the motor coil 11 can lead out a first neutral line and a second neutral line, and the first neutral line and the second neutral line are connected to different external charging ports, so as to implement ac charging of an external battery by using multiple sets of motor coils, thereby improving the applicability of the existing power battery charging circuit, reducing the cost, and having a simple circuit structure, a high integration level, and a strong overcurrent capability, thereby solving the problem of low applicability of the existing power battery charging circuit.

Further, as an embodiment of the present disclosure, as shown in fig. 9, the bridge arm converter 12 includes a first bus terminal connected to one end of the external battery 200 and a second bus terminal connected to the other end of the external battery 200;

the bidirectional leg 13 includes a fourth-phase leg, and the second end of the first external charging port 101 and the second end of the second external charging port 102 are both connected to the midpoint of the fourth-phase leg.

Further, as an embodiment of the present disclosure, as shown in fig. 13, the bridge arm converter 12 includes a first bus terminal connected to one end of the external battery 200 and a second bus terminal connected to the other end of the external battery 200;

the bidirectional bridge arm 13 includes a fourth-phase bridge arm and a fifth-phase bridge arm, the second end of the first external charging port 101 is connected to the midpoint of the fourth-phase bridge arm, and the second end of the second external charging port 102 is connected to the midpoint of the fifth-phase bridge arm.

In this embodiment, by providing two bidirectional bridge arms in the energy conversion apparatus 400, when the energy conversion apparatus 400 performs double-ac-current-sharing charging, any one bidirectional bridge arm can be selectively used, so that the service lives of the switching devices in the bidirectional bridge arm 13 can be effectively balanced, and the service life of the energy conversion apparatus 400 can be further prolonged.

Further, as an embodiment of the present disclosure, as shown in fig. 10, a specific circuit structure of the bridge arm converter 12 in this embodiment is the same as the circuit structure of the bridge arm converter 12 in the energy conversion device 100 shown in fig. 3, so that the specific circuit structure of the bridge arm converter 12 in the energy conversion device 400 may refer to fig. 3 for description, and is not repeated here.

Further, as an embodiment of the present disclosure, as shown in fig. 10, the fourth phase leg includes:

a seventh power switch Q1 and an eighth power switch Q2 connected in series, wherein a fourth midpoint of the seventh power switch Q1 and the eighth power switch Q2 is connected to the second end of the first external charging port '0' and the second end of the second external charging port 102;

the first end of the seventh power switch Q1 is a third bus end of the bidirectional bridge arm 13; the second end of the eighth power switch Q2 is a fourth bus end of the bidirectional bridge arm 13; the third bus terminal is connected to one end of the external battery 200, and the fourth bus terminal is connected to the other end of the external battery 200.

Further, as an embodiment of the present disclosure, as shown in fig. 14, the fifth phase leg includes:

a ninth power switch Q3 and a tenth power switch Q4 connected in series, and a fifth midpoint of the ninth power switch Q3 and the tenth power switch Q4 is connected to the second end of the second external charging port 102;

a first end of the ninth power switch Q3 is a fifth bus end of the bidirectional bridge arm 13; the second end of the tenth power switch Q4 is a sixth bus end of the bidirectional bridge arm 13; the fifth bus terminal is connected to one end of the external battery 200, and the sixth bus terminal is connected to the other end of the external battery 200.

As shown in fig. 14, in the embodiment of the present disclosure, the plurality of switching elements included in the bidirectional bridge arm 13 may be implemented by devices capable of performing switching operations, such as switching devices, for example, a power Transistor, a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), an Insulated Gate Bipolar Transistor (IGBT), and the like.

Further, as an embodiment of the present disclosure, as shown in fig. 9, the energy conversion apparatus 400 further includes a capacitor C1, and the capacitor C1 is connected between the first bus terminal and the second bus terminal.

In specific implementation, when the energy conversion apparatus 400 operates in the ac charging mode, in addition to filtering the voltage output by the bidirectional arm 13, the first capacitor C1 may store energy according to the voltage output by the bidirectional arm 13 during the ac charging process of the external battery 200, so as to complete the ac charging of the external battery 200.

In this embodiment, by arranging the capacitor C1 in the energy conversion device 400, the capacitor C1 can store energy according to the voltage output by the bidirectional bridge arm 13 while filtering the voltage output by the bidirectional bridge arm 13, so as to complete ac charging of the external battery 200, thereby ensuring a normal charging function of the energy conversion device 400 and ensuring that other noise waves do not interfere with the charging process; in addition, when the energy conversion apparatus 400 operates in the motor driving mode, the capacitor C1 may serve as a capacitor of a motor controller, so that the capacitor C1 may serve as a PFC capacitor and also serve as a capacitor of the motor controller for multiplexing, thereby improving the utilization rate of electronic components in the energy conversion apparatus 400 and simplifying the structure of the energy conversion apparatus.

In light of the above, it should be noted that the specific structure of the motor coil 11 in the energy conversion apparatus 400 disclosed in this embodiment is the same as the motor coil 11 in the energy conversion apparatus 100 shown in fig. 1 to 3, and therefore, details are not repeated here with respect to the specific structure and the operation principle of the motor coil 11 in the energy conversion apparatus 400 and the motor coil 11 in the energy conversion apparatus 100 shown in fig. 1 to 3.

The specific operation of the energy conversion device 100 provided by the present disclosure in the ac charging process is described below by taking the circuit shown in fig. 10 as an example, and the following details are described below:

first, it should be noted that, in the embodiment of the present disclosure, corresponding switch-on circuits are provided in both the first external charging port 101 and the second external charging port 101, and the switch-on circuits are used for gating corresponding dc circuits, and specific structures and principles of the switch-on circuits may refer to existing switch circuits, which are not described herein again; further, in the present embodiment, in the energy conversion apparatus 400 shown in fig. 10, the first external charging port 101 and the second external charging port 102 are each explained taking as an example an ac charging port, and in fig. 10, the number of first sub-coil units 111a included in the first coil unit 111 is taken as an example of three, and the number of second sub-coil units 112a included in the second coil unit 112 is taken as an example of one.

Next, the energy conversion apparatus 400 provided in the embodiment of the disclosure can also operate in the driving mode, and the specific operating principle in the driving mode is described with reference to fig. 3, which is not described again here.

Further, when the energy conversion device 400 operates in the ac charging mode, taking the energy conversion device 400 operates in the single ac charging mode as an example, the switch-on circuit inside the first external charging port 101 is in the off state, so as to prevent the first external charging port 101 from being charged during ac charging. In addition, the switch-on circuit inside the second external charging port 102 is in a conducting state, at this time, the three-phase winding of the motor coil 11 plays a role of inductance, and the three-phase bridge arm of the bridge arm converter 12 and the bridge arm of the three-phase bridge arm 13 complete the switching function, so that the motor coil 11, the bridge arm converter 12 and the three-phase bridge arm 13 form a PFC topology structure, and the PFC topology structure circuit can charge the battery 200 according to the alternating current provided by the alternating current charging pile, thereby implementing the alternating current charging function of the energy conversion device 400.

Specifically, during the ac charging process, the bridge arm converter 12 and the three-phase bridge arm 13 control the duty ratio of each power switch unit according to the command sent from the BMS, so as to complete the ac charging function. Firstly, an ABC three-phase bridge arm of the bridge arm converter 12 is subjected to high-frequency switching control, voltage waveforms with good sine degree are inverted, the charging current quality is improved, meanwhile, the three-phase bridge arm of the bridge arm converter 12 can also adopt a phase-staggered control method, so that the mutual inductance effect among three phases in the motor is weakened, the reduction of inductance of each phase is inhibited, the mutual offset effect of three-phase current ripples is realized, and the waveform of the charging current is effectively improved; the bridge arm of the three-phase bridge arm 13 is a power frequency switching frequency and is responsible for switching at a zero crossing point of the power frequency, so that the output voltage of the ABC three-phase bridge arm of the bridge arm converter 12 is changed into positive and negative, and the effect of periodical conversion along with the AC input is realized; it should be noted that, in this embodiment, the phase-error control manner of the bridge arm converter 12 is the same as the phase-error control manner of the bridge arm converter 12 during the dc charging process of the energy conversion apparatus 100, so the specific phase-error control manner of the bridge arm converter 12 can refer to the related description of the specific working manner of the bridge arm converter 12 during the dc charging process, and is not described herein again.

As mentioned above, when the energy conversion device 400 operates in the ac charging mode, the upper arm switching tubes and the lower arm switching tubes of the arm converter 12 are alternately turned on, and are turned on in the same phase or turned on in a phase staggered from each other, and the switching tubes Q1 and Q2 are matched with the upper arm switching tubes and the lower arm switching tubes at a certain frequency.

Specifically, taking the phase synchronization as an example (VT 1, VT3, VT5 synchronization, VD2, VD4, VD6 synchronization), the current flow direction of the energy conversion device 400 during the ac charging process is alternated in the following four flow directions (1), (2), (3), and (4) (as shown in fig. 11 and 12):

wherein, (1) the positive half cycle motor inductance energy storage: the positive pole of the power battery → VT1, VT3, VT5 → the winding of the alternating current motor → the N line of the motor → the alternating current charging port → Q2 → the negative pole of the power battery;

(2) Positive half cycle motor inductance follow current: alternating current motor winding → motor N line → alternating current charging port → Q1 → VT1, VT3, VT5 → alternating current motor winding;

(3) And (3) storing energy by using a negative half-cycle motor inductor: the positive pole of the power battery → Q1 → the alternating current charging port → the N line of the motor → the winding of the alternating current motor → VT2, VT4 and VT6 → the negative pole of the power battery;

(4) Negative half cycle motor inductance follow current: ac motor windings → VT2, VT4, VT6 → Q2 → ac motor windings.

In this embodiment, in the ac charging process, the live line and the zero line of the ac charging pile are connected to the vehicle through the ac charging port, the live line is connected to the neutral line of the second coil unit of the motor coil, and the zero line is connected to the bridge arm of the three-phase bridge arm 13, so that when the neutral line of the second coil unit is led out as a single central point, there is no parallel effect, that is, the inductance from the second neutral line to the three phases is greater than the inductance from the first neutral line to the three-phase inductance of the first coil unit, so that the current quality during ac charging can be effectively improved, and at the same time, the loss is reduced, and the charging efficiency is improved; in addition, in the present embodiment, the energy conversion apparatus 400 can perform dc charging and ac charging respectively in different periods.

It should be noted that, the implementation process described above is a single ac charging process of the energy conversion apparatus 400, taking the example that the first external charging port 101 in fig. 10 is turned off and the second external charging port 102 is turned on, so it can be seen that, when the first external charging port 101 in fig. 10 is turned on and the second external charging port 102 is turned off, the energy conversion apparatus 400 can also operate in the single ac charging mode, and the principle thereof is similar to that of the aforementioned single ac charging process, and is not described herein again, and in addition, the two single ac modes are performed in different time periods.

Further, when the specific circuit structure of the energy conversion apparatus 400 is the circuit shown in fig. 14, the energy conversion apparatus 400 can simultaneously operate in the dual ac mode, and the operation process of any ac mode in which the energy conversion apparatus 400 operates in the dual ac mode is the same as the single ac charging process described in fig. 10, which can be specifically described with reference to fig. 10 and is not repeated herein; it should be noted that, when the energy conversion apparatus 400 performs ac-ac simultaneously, the parameters of the two external ac charging piles are consistent.

In addition, the specific circuit structure shown in fig. 10 and 14 not only enables the energy conversion device 400 to operate in the single ac charging mode and the dual ac charging mode, but also enables the energy conversion device to operate in the single dc charging mode and the dual dc charging mode, as shown in fig. 15 and 16, it is only necessary to implement the first external charging port 101 and the second external charging port 102 by using ac/dc charging ports, which refer to charging ports that can be connected to both the ac charging post and the dc charging post; when the energy conversion device 400 shown in fig. 15 or fig. 16 operates in the dc charging process, the specific current flow direction thereof can be described with reference to fig. 3, which is different from the energy conversion device 100 provided in fig. 3 only in that the current can return to the negative pole of the charging pile through the switching tube Q2; when the energy conversion apparatus 400 shown in fig. 15 or fig. 16 operates in the ac charging process, the specific current flow direction thereof can be described with reference to fig. 10, and is not described again here.

In this embodiment, the first external charging port 101 and the second external charging port 102 are disposed in the energy conversion apparatus 400, so that the energy conversion apparatus 400 can complete dual dc charging, dual ac charging, and dual ac charging at the same time, or at different times, so that when any one of the first external charging port 101 and the second external charging port 102 fails, the energy conversion apparatus 100 can complete dc or ac charging through the other one, thereby improving reliability of the energy conversion apparatus 400, and in case that both the two charging ports can work, effectively improving charging efficiency of the energy conversion apparatus 400 when working in the charging mode, and further effectively shortening charging time; in addition, when the energy conversion device 400 realizes the alternating current-direct current integrated charging, the cost and the space can be effectively saved, and the requirements of the vehicle on the direct current charging and the alternating current charging can be met.

In addition, the energy conversion apparatus 400 disclosed in the present embodiment can also operate in a discharge mode, which includes, but is not limited to, a dc discharge, an ac discharge, or an ac/dc discharge. Specifically, when the energy conversion apparatus 400 operates in the discharging mode, the specific discharging process is opposite to the process when the energy conversion apparatus operates in the charging mode, and therefore, the discharging process of the energy conversion apparatus 400 can refer to the related description of the charging process, and is not described herein again.

Further, as an embodiment of the present application, as shown in fig. 17, another energy conversion apparatus 500 provided by the embodiment of the present disclosure includes:

a motor coil 11 having a first neutral line and a second neutral line drawn out at one end thereof, and connected to a first end of the first external charging port 101 via the first neutral line, and connected to a first end of the second external charging port 102 via the second neutral line;

the bridge arm converter 12 comprises a first phase bridge arm A, a second phase bridge arm B and a third phase bridge arm C which are connected in parallel, the other end of the motor coil 11 is connected with the first phase bridge arm A, the second phase bridge arm B and the third phase bridge arm C, and the bridge arm converter 12 is further connected with a second end of the first external charging port 101; and

a bidirectional arm 13 connected in parallel with the arm converter 12 to both ends of the external battery 200 and connected to a second end of the second external charging port 102;

In this embodiment, the first external charging port 101 is a dc charging port, and the second external charging port 102 is an ac charging port.

Further, as an embodiment of the present disclosure, as shown in fig. 18, the bridge arm converter 12 includes a first bus terminal connected to one end of the external battery 200 and a second bus terminal connected to the other end of the external battery 200 and a second end of the first external charging port 101;

the bidirectional leg 13 includes a fourth-phase leg, and the second end of the second external charging port 102 is connected to the midpoint of the fourth-phase leg.

Further, as an embodiment of the present disclosure, as shown in fig. 19, the first phase bridge arm a includes a first power switch VT1 and a second power switch VT2 connected in series, and a first midpoint of the first power switch VT1 and a first midpoint of the second power switch VT2 are connected to the first phase coil of the motor coil 11;

Further, as an embodiment of the present disclosure, as shown in fig. 19, the fourth phase leg includes:

a seventh power switch Q1 and an eighth power switch Q2 connected in series, wherein a fourth midpoint of the seventh power switch Q1 and the eighth power switch Q2 is connected to the second end of the second external charging port 102;

Further, as an embodiment of the present disclosure, the energy conversion apparatus 500 further includes a capacitor C1 connected between the first bus terminal and the second bus terminal.

Further, as an embodiment of the present disclosure, as shown in fig. 19, a specific structure of the motor coil 11 in the energy conversion apparatus 500 provided in this embodiment is the same as the structure of the motor coil 11 in the energy conversion apparatus 100 and the energy conversion apparatus 400, and specific reference may be made to the description of the energy conversion apparatus 100 and the energy conversion apparatus 400, which is not repeated herein; in the circuit configuration shown in fig. 19, the first external charging port 101 will be described by taking a dc charging port as an example, and the second external charging port 102 will be described by taking an ac charging port as an example.

It should be noted that, in this embodiment, when the energy conversion apparatus 500 operates in the dc charging mode, the specific operation process is the same as the dc operation mode of the energy conversion apparatus 100, so the specific process can refer to the foregoing related description, and is not repeated herein; when the energy conversion apparatus 500 works in the dc charging mode, the specific working process thereof is the same as the ac working mode of the energy conversion apparatus 400, and thus the detailed process can refer to the foregoing description, and will not be described herein again.

Further, as shown in fig. 20, an energy conversion device 600 provided by the embodiment of the present disclosure includes a motor coil 11, one end of which leads out a first neutral line and a second neutral line, and the first neutral line and the second neutral line are not connected together;

the bridge arm converter 12 comprises a first phase bridge arm A, a second phase bridge arm B and a third phase bridge arm C, the first phase bridge arm A, the second phase bridge arm B and the third phase bridge arm C are connected in parallel to form a first current collecting end S1 and a second current collecting end S2, and the other end of the motor coil 11 is connected with the middle points of the first phase bridge arm A, the second phase bridge arm B and the third phase bridge arm C.

Further, the energy conversion device 600 further includes a charging connection terminal set 14, and the charging connection terminal set 14 includes a first charging connection terminal 141, a second charging connection terminal 142, and a third charging connection terminal 143. Specifically, the first charging connection terminal 141 is connected to one end of the motor coil 11, the second charging connection terminal 142 is also connected to one end of the motor coil 11, and the third charging connection terminal 143 is connected to the second bus terminal S2 of the bridge arm converter 12.

In specific implementation, the charging connection terminal group 14 is connected to the first external charging port 101 and the second external charging port 102, and the charging connection terminal group 14 employs one of a connection line, a connector, or a connection interface.

It should be noted that in this embodiment, specific structures of the bridge arm converter 12 and the motor coil 11 may refer to related descriptions of the bridge arm converter 12 and the motor coil 11 in the energy conversion device 100, and are not described herein again.

Further, as shown in fig. 21, an energy conversion device 700 provided by the embodiment of the present disclosure includes a motor coil 11, one end of which leads out a first neutral line and a second neutral line, and the first neutral line and the second neutral line are not connected together;

the bridge arm converter 12 comprises a first phase bridge arm A, a second phase bridge arm B and a third phase bridge arm C, the first phase bridge arm A, the second phase bridge arm B and the third phase bridge arm C are connected in parallel to form a first current collecting end S1 and a second current collecting end S2, and the other end of the motor coil 11 is connected with the middle points of the first phase bridge arm A, the second phase bridge arm B and the third phase bridge arm C;

and the bidirectional bridge arm 13 is connected with the bridge arm converter 12 in parallel, and a charging connecting end S3 is led out from the midpoint of the bidirectional bridge arm.

Further, the energy conversion device 600 further includes a charging connection terminal set 14, and the charging connection terminal set 14 includes a first charging connection terminal 141, a second charging connection terminal 142, a third charging connection terminal 143, and a fourth charging connection terminal 144. Specifically, the first charging connection terminal 141 is connected to one end of the motor coil 11, the second charging connection terminal 142 is also connected to one end of the motor coil 11, the third charging connection terminal 143 is connected to the second bus terminal S2 of the bridge arm converter 12, and the fourth charging connection terminal 144 is connected to the charging connection terminal S3 led out from the bidirectional bridge arm 13.

In specific implementation, the charging connection terminal set 14 is connected to the first external charging port 101 and the second external charging port 102, and the charging connection terminal set 14 adopts one of a connection line, a connector, or a connection interface.

It should be noted that in this embodiment, specific structures of the arm converter 12, the motor coil 11 and the bidirectional arm 13 can refer to the description of the arm converter 12, the motor coil 11 and the bidirectional arm 13 in the energy conversion device 500, and are not described herein again.

Further, the present disclosure also provides a vehicle including an energy conversion device; it should be noted that, since the energy conversion device in the vehicle provided by the embodiment of the present disclosure is the same as the energy conversion device shown in fig. 1 to 21, reference may be made to the foregoing detailed description about fig. 1 to 21 for a specific working principle of the energy conversion device 100 in the vehicle provided by the embodiment of the present disclosure, and details are not repeated here.

In the disclosure, by adopting an energy conversion device comprising a motor coil and a bridge arm converter in a vehicle, the motor coil can lead out a first neutral line and a second neutral line, and the first neutral line and the second neutral line are connected with different external charging ports, so that a plurality of sets of motor coils are adopted to charge an external battery, the applicability of the existing power battery charging circuit is improved, the cost is reduced, and the circuit structure is simple, the integration level is high, and the overcurrent capability is strong.

The above description is meant to be illustrative of the preferred embodiments of the present disclosure and not to be construed as limiting the disclosure, and any modifications, equivalents, improvements, etc. that fall within the spirit and scope of the present disclosure are intended to be included therein.

Claims

1. An energy conversion device, comprising:

the external battery drives the motor through the energy conversion device; the first external charging port and/or the second external charging port are/is externally connected with a power supply and charge the external battery through an energy conversion device;

the bridge arm converter comprises a first bus end and a second bus end, the first bus end is connected with one end of the external battery, the second bus end is connected with the other end of the external battery, and the second end of the first external charging port and the second end of the second external charging port are connected together and then connected with the second bus end of the bridge arm converter.

2. The energy conversion device of claim 1, wherein the first external charging port and the second external charging port are both dc charging ports.

3. The energy conversion device of claim 1, wherein the first phase leg comprises a first power switch and a second power switch connected in series, a first midpoint of the first power switch and the second power switch being connected to a first phase coil of the motor coil;

the second phase bridge arm comprises a third power switch and a fourth power switch which are connected in series, and second middle points of the third power switch and the fourth power switch are connected with a second phase coil of the motor coil;

the third phase bridge arm comprises a fifth power switch and a sixth power switch which are connected in series, and third middle points of the fifth power switch and the sixth power switch are connected with a third phase coil of the motor coil;

a first end of the first power switch, a first end of the third power switch and a first end of the fifth power switch are connected together to form a first bus end of the bridge arm converter; and a second end of the second power switch, a second end of the fourth power switch and a second end of the sixth power switch are connected in common to form a second bus end of the bridge arm converter.

4. The energy conversion device of claim 3, further comprising:

a capacitor connected between the first bus terminal and the second bus terminal.

5. The energy conversion apparatus according to any one of claims 1 to 4, wherein the motor coil includes a first coil unit that leads out at least one first neutral wire and is connected to the first external charging port through the first neutral wire, and a second coil unit that leads out at least one second neutral wire and is connected to the second external charging port through the second neutral wire.

6. The energy conversion apparatus according to claim 5, wherein the first coil unit includes N first sub-coil units that lead out at least one first neutral line, the second coil unit includes M second sub-coil units that lead out at least one second neutral line; wherein N is an integer of not less than 1, and M is an integer of not less than 1.

7. The energy conversion device of claim 6, wherein the value of N is greater than the value of M.

8. An energy conversion device, comprising:

the external battery drives the motor through the energy conversion device, the first external charging port and/or the second external charging port are/is externally connected with a power supply, and the external battery is charged through the energy conversion device;

the bridge arm converter comprises a first bus end and a second bus end, the first bus end is connected with one end of the external battery, and the second bus end is connected with the other end of the external battery;

the bidirectional bridge arm comprises a fourth-phase bridge arm, and the second end of the first external charging port and the second end of the second external charging port are both connected with the midpoint of the fourth-phase bridge arm.

9. The energy conversion device of claim 8, wherein the first external charging port and the second external charging port are both ac charging ports.

10. The energy conversion device of claim 8, wherein the first external charging port and the second external charging port are both ac and dc charging ports.

11. The energy conversion device according to claim 9 or 10, wherein the bridge arm converter includes a first bus terminal connected to one end of the external battery and a second bus terminal connected to the other end of the external battery;

the bidirectional bridge arm comprises a fourth-phase bridge arm and a fifth-phase bridge arm, the second end of the first external charging port is connected with the midpoint of the fourth-phase bridge arm, and the second end of the second external charging port is connected with the midpoint of the fifth-phase bridge arm.

12. The energy conversion device of claim 8, wherein the first phase leg comprises a first power switch and a second power switch connected in series, a first midpoint of the first power switch and the second power switch being connected to a first phase coil of the motor coils;

a first end of the first power switch, a first end of the third power switch and a first end of the fifth power switch are connected in common to form a first bus end of the bridge arm converter; and a second end of the second power switch, a second end of the fourth power switch and a second end of the sixth power switch are connected in common to form a second bus end of the bridge arm converter.

13. The energy conversion device of claim 12, wherein the fourth phase leg comprises:

a seventh power switch and an eighth power switch connected in series, fourth midpoints of the seventh power switch and the eighth power switch being connected to the second end of the first external charging port and the second end of the second external charging port;

the first end of the seventh power switch is a third bus end of the bidirectional bridge arm; a second end of the eighth power switch is a fourth bus end of the bidirectional bridge arm; the third bus end is connected with one end of the external battery, and the fourth bus end is connected with the other end of the external battery.

14. The energy conversion device of claim 11, wherein the fourth phase leg comprises:

a seventh power switch and an eighth power switch connected in series, fourth midpoints of the seventh power switch and the eighth power switch being connected to a second end of the first external charging port;

the first end of the seventh power switch is a third bus end of the bidirectional bridge arm; a second end of the eighth power switch is a fourth bus end of the bidirectional bridge arm; the third bus end is connected with one end of the external battery, and the fourth bus end is connected with the other end of the external battery;

the fifth phase leg includes:

a ninth power switch and a tenth power switch connected in series, fifth midpoints of the ninth power switch and the tenth power switch being connected to a second end of the second external charging port;

the first end of the ninth power switch is a fifth junction end of the bidirectional bridge arm; a second end of the tenth power switch is a sixth bus end of the bidirectional bridge arm; the fifth junction is connected with one end of the external battery, and the sixth junction is connected with the other end of the external battery.

15. The energy conversion device of claim 14, further comprising:

16. The energy conversion apparatus according to any one of claims 8 to 10 and 12 to 15, wherein the motor coil includes a first coil unit and a second coil unit, the first coil unit drawing at least one first neutral wire and being connected to the first external charging port through the first neutral wire, the second coil unit drawing at least one second neutral wire and being connected to the second external charging port through the second neutral wire.

17. The energy conversion apparatus according to claim 16, wherein the first coil unit includes N first sub-coil units that lead out at least one first neutral line, the second coil unit includes M second sub-coil units that lead out at least one second neutral line; wherein N is an integer not less than 1, and M is an integer not less than 1.

18. The energy conversion device of claim 17, wherein the value of N is greater than the value of M.

19. An energy conversion device, comprising:

the bridge arm converter comprises a first bus end and a second bus end, the first bus end is connected with one end of the external battery, and the second bus end is connected with the other end of the external battery and the second end of the first external charging port;

the bidirectional bridge arm comprises a fourth-phase bridge arm, and the second end of the second external charging port is connected with the midpoint of the fourth-phase bridge arm.

20. The energy conversion device of claim 19, wherein the first external charging port is a dc charging port and the second external charging port is an ac charging port.

21. The energy conversion device of claim 20, wherein the first phase leg comprises a first power switch and a second power switch connected in series, a first midpoint of the first power switch and the second power switch being connected to a first phase coil of the motor coil;

22. The energy conversion device of claim 21, wherein the fourth phase leg comprises:

a seventh power switch and an eighth power switch connected in series, fourth midpoints of the seventh power switch and the eighth power switch being connected to a second end of the second external charging port;

23. The energy conversion device according to any one of claims 19 to 22, further comprising:

24. The energy conversion apparatus according to claim 19, wherein the motor coil includes a first coil unit that draws out at least one first neutral wire and is connected to the first external charging port through the first neutral wire, and a second coil unit that draws out at least one second neutral wire and is connected to the second external charging port through the second neutral wire.

25. The energy conversion apparatus according to claim 24, wherein the first coil unit includes N first sub-coil units that lead out at least one first neutral line, the second coil unit includes M second sub-coil units that lead out at least one second neutral line; wherein N is an integer not less than 1, and M is an integer not less than 1.

26. The energy conversion device of claim 25, wherein the value of N is greater than the value of M.

27. An energy conversion device, comprising:

the bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, wherein the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are connected in parallel to form a first current collecting end and a second current collecting end, and the other end of the motor coil is connected with the middle points of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm; the first bus end is connected with one end of an external battery, the second bus end is connected with the other end of the external battery, and the second end of the first external charging port and the second end of the second external charging port are connected with the second bus end of the bridge arm converter after being connected together.

28. An energy conversion device, comprising:

the bridge arm converter comprises a first phase bridge arm, a second phase bridge arm and a third phase bridge arm, wherein the first phase bridge arm, the second phase bridge arm and the third phase bridge arm are connected in parallel to form a first current collecting end and a second current collecting end, and the other end of the motor coil is connected with the middle points of the first phase bridge arm, the second phase bridge arm and the third phase bridge arm; the first bus end is connected with one end of an external battery, the second bus end is connected with the other end of the external battery, and the second end of the first external charging port and the second end of the second external charging port are connected with the second bus end of the bridge arm converter after being connected together;

29. A vehicle comprising an energy conversion device according to any one of claims 1 to 7, or comprising an energy conversion device according to any one of claims 8 to 18, or comprising an energy conversion device according to any one of claims 19 to 26, or comprising an energy conversion device according to claim 27, or comprising an energy conversion device according to claim 28.