CN112224038A

CN112224038A - Energy conversion device, power system and vehicle

Info

Publication number: CN112224038A
Application number: CN201910582143.0A
Authority: CN
Inventors: 滕景翠; 刘宇; 梁树林; 王超
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2019-06-30
Filing date: 2019-06-30
Publication date: 2021-01-15
Anticipated expiration: 2039-06-30
Also published as: CN112224038B

Abstract

The application belongs to the technical field of electronics, and especially relates to an energy conversion device, a power system and a vehicle. In the application, by adopting the energy conversion device which comprises the motor coil, the bridge arm converter, the bidirectional bridge arm and the bidirectional DC module and integrates the driving and charging functions, the energy conversion device can work in a driving mode, a direct current charging mode, an alternating current charging mode and an emergency driving mode, so that the motor driving, the battery charging and the vehicle emergency of the vehicle can be realized by adopting the same system, especially, the direct current charging and the alternating current charging can be realized by adopting the same circuit topology, the multiplexing degree of components is high, the system integration degree is high, the structure is simple, the system cost is reduced, the system volume is reduced, and the problems that the overall circuit structure of the motor driving and charging system is complex, the integration degree is low, the size is large, the cost is high and the emergency requirement of the vehicle cannot be completed in the prior art are solved.

Description

Energy conversion device, power system and vehicle

Technical Field

The application belongs to the technical field of electronics, and especially relates to an energy conversion device, a power system and a vehicle.

Background

In recent years, with the development and rapid popularization of electric vehicles, motor control and battery charging of electric vehicles have become more and more important. At present, the motor drive and the battery charge of the existing electric automobile are separated independently, that is, the motor drive circuit and the battery charge circuit are two independent and unrelated circuits, the motor drive circuit is only used for motor drive and cannot be used for battery charge, and the battery charge circuit is only used for battery charge and cannot be used for motor drive.

However, although the above method can effectively ensure the normal operation of the motor driving and the battery charging of the vehicle, the above method has a complicated circuit structure, low integration level, large volume and high cost because the motor driving circuit and the battery charging circuit are independent and unrelated to each other; in addition, the power battery is of a high importance as a power source of the electric vehicle, and therefore, when the power battery is short of electricity, the emergency demand of the vehicle cannot be fulfilled.

In conclusion, the prior art has the problems that the overall circuit structure of the motor driving and charging system is complex, the integration level is low, the size is large, the cost is high, and the emergency requirement of the vehicle cannot be met.

Disclosure of Invention

The application aims to provide an energy conversion device, a power system and a vehicle, and aims to solve the problems that the overall circuit of a motor driving and charging system is complex in structure, low in integration level, large in size, high in cost and incapable of meeting the emergency requirement of the vehicle.

A first aspect of the present application provides an energy conversion device, including a motor coil, a bridge arm converter, a bidirectional bridge arm, and a bidirectional DC module;

the bridge arm converter is respectively connected with the motor coil, the bidirectional bridge arm and the bidirectional DC module, and the bidirectional bridge arm is connected with the bidirectional DC module;

the motor coil, the bridge arm converter and the bidirectional bridge arm are all connected with an external charging port, the bridge arm converter and the bidirectional DC module are all connected with an external power battery, and the bidirectional DC module is connected with an external storage battery;

the external charging port, the motor coil, the bridge arm converter and an external power battery form a direct current charging circuit, or the external charging port, the motor coil, the bridge arm converter, the bidirectional DC and the external power battery module form a direct current charging circuit so as to charge the external power battery;

the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm and the external power battery form an alternating current charging circuit, or the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit so as to charge the external power battery;

the external power battery, the bridge arm converter and the motor coil form a motor driving circuit to drive a motor comprising the motor coil;

the external storage battery, the bidirectional DC module, the bridge arm converter and the motor coil form an emergency driving circuit.

A second aspect of the present application provides a power system including the energy conversion apparatus provided in the first aspect and a control module, wherein the energy conversion apparatus includes:

a motor including a motor coil;

the motor control module comprises a bridge arm converter, the bridge arm converter is connected with one end of the motor coil, and the other end of the motor coil is connected with an external charging port; and the number of the first and second groups,

the vehicle-mounted charging module comprises a bidirectional bridge arm, the bidirectional bridge arm is connected with the bridge arm converter in parallel to form a first common end and a second common end, the first common end is connected with one end of an external power battery, the second common end is connected with the other end of the external power battery, and the external charging port is connected with the second common end and the midpoint of the bidirectional bridge arm;

a bidirectional DC module connected in parallel with the bridge arm converter and the bidirectional bridge arm and connected with the external power battery and the external storage battery;

the control module is used for controlling a direct current charging circuit formed by an external charging port, the motor coil, the bridge arm converter and an external power battery, or is used for controlling the direct current charging circuit formed by the external charging port, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery; the alternating current charging circuit is used for controlling an external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm and an external power battery to form an alternating current charging circuit, or the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit; the motor driving circuit is used for controlling the external power battery, the bridge arm converter and the motor coil to form; and the emergency driving circuit is used for controlling the external storage battery, the bidirectional DC module, the bridge arm converter and the motor coil to form an emergency driving circuit.

A third aspect of the present application is to provide an energy conversion apparatus comprising:

the charging connection end group comprises a first charging connection end, a second charging connection end and a third charging connection end;

one end of the motor coil is connected with the first charging connecting end;

the bridge arm converter is respectively connected with the other end of the motor coil and the second charging connecting end;

a bidirectional bridge arm connected in parallel with the bridge arm converter, the bidirectional bridge arm being connected to the third charging connection end;

a bidirectional DC module connected in parallel with the bidirectional leg;

the first energy storage connecting end group comprises a first energy storage connecting end and a second energy storage connecting end, the first energy storage connecting end is respectively connected with one end of the bidirectional DC module and the bridge arm converter, and the second energy storage connecting end is respectively connected with the other end of the bidirectional DC module and the bridge arm converter;

and the second energy storage connecting terminal group comprises a third energy storage connecting terminal and a fourth energy storage connecting terminal, the third energy storage connecting terminal is connected with one end of the bidirectional DC module, and the fourth energy storage connecting terminal is connected with the other end of the bidirectional DC module.

A fourth aspect of the present application provides a power system including the energy conversion apparatus provided in the third aspect and a control module, wherein the energy conversion apparatus includes:

the vehicle-mounted charging module comprises a bidirectional bridge arm and a charging connection end group, the charging connection end group comprises a first charging connection end, a second charging connection end and a third charging connection end, and the bidirectional bridge arm is connected with the third charging connection end;

the motor comprises a motor coil, and the motor coil is connected with the first charging connecting end;

the motor control module comprises a bridge arm converter which is respectively connected with the other end of the motor coil and the second charging connecting end, and the bridge arm converter is connected with a bidirectional bridge arm in parallel;

a bidirectional DC module connected with the bidirectional bridge arm;

a second set of energy storage connections including a third energy storage connection connected to one end of the bi-directional DC module and a fourth energy storage connection connected to the other end of the bi-directional DC module;

the control module is used for the charging connection end group, the motor coil, the bridge arm converter and the first energy storage connection end group to form a direct current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional DC module and the first energy storage connection end group to form a direct current charging circuit; the control circuit is used for controlling the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm and the first energy storage connection end group to form an alternating current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the first energy storage connection end group to form an alternating current charging circuit, the control circuit is used for controlling the first energy storage connection end group, the bridge arm converter and the motor coil to form a motor driving circuit, and the control circuit is used for controlling the second energy storage connection end group, the bidirectional DC module, the bridge arm converter and the motor coil to form an emergency driving circuit.

A fifth aspect of the present application is to provide a vehicle including the power system provided in the second aspect or the power system provided in the fourth aspect.

In the application, by adopting the energy conversion device which comprises the motor coil, the bridge arm converter, the bidirectional bridge arm and the bidirectional DC module and integrates the driving and charging functions, the energy conversion device can work in a driving mode, a direct current charging mode, an alternating current charging mode and an emergency mode, so that the motor driving, the battery charging and the vehicle emergency of a vehicle can be realized by adopting the same system, especially, the direct current charging and the alternating current charging can be realized by adopting the same circuit topology, the multiplexing degree of components is high, the system integration degree is high, the structure is simple, the system cost is reduced, the system volume is reduced, and the problems that the overall circuit structure of the motor driving and charging system in the prior art is complex, the integration degree is low, the size is large, the cost is high, and the emergency requirement of the vehicle cannot be finished are solved.

Drawings

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

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

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

fig. 4 is a schematic circuit diagram of an energy conversion device according to a fourth embodiment of the present application;

fig. 5 is a schematic circuit diagram of an energy conversion device according to a fourth embodiment of the present application;

fig. 6 is a schematic block diagram of an energy conversion device according to a fifth embodiment of the present application;

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

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

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

fig. 10 is a schematic timing diagram illustrating operation of a bridge arm converter in the energy conversion device shown in fig. 1 to 9 according to the present application;

FIG. 11 is a schematic block diagram of a powertrain provided in an eighth embodiment of the present application;

FIG. 12 is a schematic block diagram of a powertrain provided in a ninth embodiment of the present application;

FIG. 13 is a schematic illustration of a powertrain provided in a tenth embodiment of the present application;

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

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

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

fig. 17 is a schematic circuit diagram of an energy conversion device according to a fourteenth 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 will be further described in detail 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.

Implementations of the present application are described in detail below with reference to the following detailed drawings:

fig. 1 shows a module structure of an energy conversion device provided in a first embodiment of the present application, and for convenience of description, only the parts related to the present embodiment are shown, and detailed description is as follows:

as shown in fig. 1, the energy conversion device provided by the embodiment of the present application includes a motor coil 11, an arm converter 12, a bidirectional arm 13, and a bidirectional DC module 15.

The bridge arm converter 12 is respectively connected with the motor coil 11, the bidirectional bridge arm 13 and the bidirectional DC module 15, and the bidirectional bridge arm 13 is connected with the bidirectional DC module 15;

the motor coil 11, the arm converter 12, and the bidirectional arm 13 are all connected to the external charging port 10, the arm converter 12 and the bidirectional DC module 15 are all connected to the external power battery 200, and the bidirectional DC module 15 is connected to the external storage battery 300.

Specifically, the external charging port 10, the motor coil 11, the bridge arm converter 12 and the external power battery 200 form a direct current charging circuit, or the external charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15 and the external power battery 200 form a direct current charging circuit to charge the external power battery 200;

the external charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13 and the external power battery 200 form an alternating current charging circuit, or the external charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13, the bidirectional DC module 15 and the external power battery 200 form an alternating current charging circuit to charge the external power battery 200;

the external power battery 200, the bridge arm inverter 12, and the motor coil 11 form a motor driving circuit to drive the motor including the motor coil 11;

the external battery 300, the bidirectional DC module 15, the arm converter 12, and the motor coil 11 form an emergency drive circuit.

In specific implementation, when the energy conversion device is used for dc charging or ac charging, the energy conversion device may be connected to an external dc power supply or an external ac power supply through the charging port 10, the dc power supply may be a dc power obtained by rectifying the external ac power supply through the charging port, or a dc power input by the external dc power supply through the charging port, the ac power supply may be an ac power obtained by inverting the external dc power supply through the charging port, or an ac power input by the external ac power supply through the charging port, which is not limited herein.

In addition, it should be noted that, in the specific operation, the energy conversion device may be operated not only in the ac charging mode, the dc charging mode, the motor driving mode, the emergency driving mode, and the like, but also in the dc discharging mode, the ac discharging mode, the driving discharging mode, the ac emergency discharging mode, the dc emergency discharging mode, and the like, and the various operation modes of the energy conversion device will be described in detail later.

In addition, in the present application, "external battery" and "external charging 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.

In this embodiment, by using the energy conversion device integrating the driving and charging functions, which includes the motor coil, the bridge arm converter, the bidirectional bridge arm, and the bidirectional DC module, the energy conversion device can operate in the driving mode, the DC charging mode, the ac charging mode, and the emergency driving mode, so as to implement the motor driving, the battery charging, and the vehicle emergency using the same system, and in particular, the DC charging and the ac charging can be implemented using the same circuit topology, the multiplexing degree of components is high, the system integration level is high, and the structure is simple, thereby reducing the system cost, reducing the system volume, and solving the problems that the overall circuit structure of the motor driving and charging system in the prior art is complex, the integration level is low, the size is large, the cost is high, and the emergency demand of the vehicle cannot be fulfilled.

In addition, because the charging power difference distance between current alternating current charging system and direct current charging system is great between the two, consequently two charging system's circuit topology difference is great, general two systems independent settings, multiplexing degree is lower, and the commonality of the energy conversion device that this application shows is strong, it is no matter to face direct current charging station or alternating current charging station, this energy conversion device all can charge, the system cost has been reduced, the system volume has been reduced, the problem that current alternating current charging system and direct current charging system overall structure are complicated has been solved, multiplexing degree is low.

Further, the bridge arm converter 12 can realize bidirectional current conversion, and when the energy conversion device works in a driving mode, the bridge arm converter 12 serves as a three-phase inversion function to realize the function of the motor controller. When the energy conversion device operates in the ac charging mode, the bridge arm converter 12 performs rectification and power correction functions, and when the energy conversion device operates in the dc charging mode, the bridge arm converter 12 performs a dc boosting function.

In the related art, an alternating current charging module is required for realizing alternating current charging, a direct current charging module is required for realizing direct current charging, an inverter module is required for realizing motor driving, and none of the related technologies integrates the three functions into one module, so that the circuit structure is complex, the integration level is low, the size is large, and the cost is high. The three functions are creatively integrated in the same circuit, the function multiplexing of a plurality of components is realized, and after the functions are integrated, the split type product with mutually independent current charging module, alternating current charging module and inversion module is compared.

Further, the motor coil 11, the bridge arm converter 12 and the bidirectional bridge arm 13 realize function multiplexing. In the motor driving circuit, a motor coil 11 is used for generating induced electromotive force after being electrified, and a bridge arm converter 12 is used for realizing a three-phase inversion function; in the ac charging circuit, the motor coil 11 functions as an inductor in the PFC circuit, the leg converter 12 functions as one leg in the PFC circuit, and the bidirectional leg 13 functions as the other leg in the PFC circuit; in the direct current charging circuit, the motor coil 11 functions as a boost inductor in the boost DC on the one hand and reduces ripple in the circuit on the other hand, and the arm converter 12 functions as an arm in the boost DC.

In addition, in the prior art, the alternating current charging system and the direct current charging system are independently arranged, the multiplexing degree is low, the two systems are large in size and high in cost, the energy conversion device can realize the alternating current charging function and the direct current charging function, and the function multiplexing is realized, namely, the motor coil and the bridge arm converter participate in alternating current charging and direct current charging, the multiplexing of components is realized, and the problems of complex structure, low multiplexing degree, high cost and large size in the prior art are solved through the function multiplexing and the component multiplexing.

Further, since a household socket is generally used for ac charging, a power of a commonly used ac power source is generally seven kilowatts (kW), and a professional charging pile is generally used for dc charging, a power of the professional charging pile is generally 60kW to 150kW, and a rapid dc charging pile larger than 100kW is a development trend, and in addition, a power of a motor driving is generally about 100kW, it can be known from the above description that power levels of a vehicle in three cases of motor driving, dc charging, and ac charging are greatly different, and the power difference is very important for selecting a switching tube.

For the switching tubes, since the high-power switching tube is more expensive than the low-power switching tube, based on the consideration of different powers required when the energy conversion device works in the motor driving mode, the direct-current charging mode and the alternating-current charging mode, the type of the switching tube in the bridge arm converter 12 is different from that of the switching tube in the bidirectional bridge arm 13, that is, the bidirectional bridge arm 13 and the bridge arm converter 12 use switching tubes with different power levels, in one embodiment, the power level of the switching tube used by the bridge arm converter 12 is greater than that of the switching tube used by the bidirectional bridge arm 13. For example: among the same type of switching tubes, the bridge arm converter 12 adopts a high-current-level MOSFET switching tube, and the bidirectional bridge arm 13 adopts a low-current-level MOSFET switching tube; or for example: among the different types of switching tubes, the bridge arm converter 12 adopts a high-power IGT switching tube, and the bidirectional bridge arm 13 adopts a low-power MOSFET switching tube. Specifically, in the present embodiment, since the high-power modes such as the dc charging and the motor driving are all used for the bridge arm converter 12, the bridge arm converter 12 in the present embodiment is implemented by using a high-power IGT switching tube or a high-current MOSFET switching tube, and since the bidirectional bridge arm 13 mainly works during the ac charging, the bidirectional bridge arm 13 can be implemented by using a low-power MOSFET, so that the circuit cost can be reduced while the energy conversion device is ensured to work effectively.

On the other hand, when ac charging is performed, the switching frequency required by the bidirectional arm 13 is high (for example, 60kHz), so that it is necessary to use a MOSFET switching tube or a silicon carbide MOSFET switching tube that can realize high-frequency operation, and since the arm converter 121 has a three-phase arm and its operation mode is three-phase interleaved control, the frequency required by the switching tube of the arm converter 12 is low, so that the switching tube type in the arm converter 12 is different from the switching tube type in the bidirectional arm 13, for example: the switching tube type in the bridge arm converter 12 is an IGT switching tube with high efficiency in low-frequency operation.

In addition, when the energy conversion device operates in an ac charging mode or a dc charging mode, the three-phase interleaved control operation mode adopted by the bridge arm converter 12 can reduce the dc-side ripple and increase the charging power when the energy conversion device is charging.

When the energy conversion device is used for testing the alternating current and direct current charging performance, the inventor proposes a design concept of improving the overall inductance of the energy conversion device to improve the charging efficiency, and finds that improving the inductance of a motor coil is one of feasible ways by researching the structure of the motor.

Further, as an embodiment of the present application, as shown in fig. 2, the motor coil 11 includes three-phase windings, each phase winding includes N coil branches, and first ends of the N coil branches in each phase winding are connected to the bridge arm converter 12 after being connected in common, second ends of the N coil branches in each phase winding are connected to second ends of the N coil branches in the other two-phase windings in a one-to-one correspondence manner to form N neutral points, and the charging port 10 is connected to M neutral points; where N is an integer greater than 1 and preferably 4, and M is a positive integer less than N.

Specifically, in fig. 2, a specific structure of the motor coil 11 of the present application is described by taking an example where M is 2 and N is 4, that is, two neutral points among four neutral points are connected to the charging port 10; in the present embodiment, the number of coil branches included in each phase winding of the motor coil 11 is described by taking 4 as an example, and the number of coil branches is not limited to a specific number.

The three-phase winding of the motor coil 11 will be described in detail below by way of specific examples, as follows:

specifically, as shown in fig. 2, the motor coil 11 includes a U-phase winding, a V-phase winding, and a W-phase winding, and each of the U-phase winding, the V-phase winding, and the W-phase winding includes N coil branches.

Further, as shown in fig. 2, first ends of N coil branches in the U-phase winding are connected to a first phase bridge arm of the bridge arm converter 12 after being connected in common, first ends of N coil branches in the V-phase winding are connected to a second phase bridge arm of the bridge arm converter 12 after being connected in common, first ends of N coil branches in the W-phase winding are connected to a third phase bridge arm of the bridge arm converter 12 after being connected in common, and second ends of N coil branches of each of the U-phase winding, the V-phase winding and the W-phase winding are connected to second ends of N coil branches in the other two-phase windings in one-to-one correspondence, so as to form N neutral points N1, N2 and N3., and the N neutral points can be directly connected to the charging port 10 or can be connected to the charging port 10 through other connecting circuits, in this embodiment, M neutral points of the N neutral points are directly connected to the charging port 10, and the connection circuit will be described in detail later, and will not be described in detail here.

In this embodiment, compare all neutral points of motor coil and all be connected with the mouth that charges, in this embodiment, be connected partial neutral point with the mouth that charges, lead to parallelly connected motor coil to reduce, motor coil's equivalent inductance increases, and energy conversion device's whole inductance increases to charging efficiency has been promoted.

In another embodiment, the inventor comprehensively considers the factors of charging power and charging efficiency, the charging power is positively correlated with the overcurrent capacity of the motor coils, and the more the motor coils are connected in parallel, the stronger the overcurrent capacity is; the charging efficiency is negatively related to the inductance of the motor coil, and the fewer the motor coils are connected in parallel, the greater the inductance of the motor coil is. This embodiment is through adopting every phase winding all to include the motor coil 11 of N coil branch road for this energy conversion device can realize direct current charging or alternating current charging under the different power through the inductance value that changes motor coil 11, and then realizes the purpose of this energy conversion device's charging power accessible inductance value regulation.

Further, as an embodiment of the present application, as shown in fig. 3, the energy conversion apparatus further includes a neutral switch 130. The neutral point switch 130 is used to control M neutral points of the N neutral points of the motor coil 11 to be connected to the charging port 10.

In specific implementation, the neutral point switch 130 may be implemented by N single-pole single-throw switches, or may be implemented by a plurality of single-pole double-throw switches. When the neutral point switch 130 is implemented by N single-pole single-throw switches, first ends of the N single-pole single-throw switches are connected to N neutral points of the motor coil 11 in a one-to-one correspondence, and second ends of the N single-pole single-throw switches are connected to the charging port 10. When the neutral point switch 10 is implemented by using a plurality of single-pole double-throw switches, the moving ends of the plurality of single-pole double-throw switches are all connected with the charging port 10, and the two fixed ends of each single-pole double-throw switch are correspondingly connected with two neutral points in the motor coil 11 one by one according to requirements. In addition, the neutral point switch 10 can also be implemented by a single-pole multi-throw switch, a moving end of the single-pole multi-throw switch is connected with the charging port 10, and each stationary end of the single-pole multi-throw switch is respectively connected with the neutral point in the motor coil 11 in a one-to-one correspondence manner according to requirements.

In the present embodiment, a neutral point switch 130 is added to the energy conversion apparatus, and the neutral point switch is selectively turned on and off, so that the neutral point switch 130 connects the charging port 10 with M neutral points of N neutral points of the motor coil 11, and further, the energy conversion apparatus is convenient to turn on or off the switches of the neutral point switch 130 as required, so that different numbers of coil branches are selected from three-phase windings of the motor coil 11, thereby realizing adjustment of the charging power.

Further, as an embodiment of the present application, as shown in fig. 4, the energy conversion apparatus further includes a switch module 14.

One end of the switch module 14 is connected to the charging port 10, and the other end is connected to the motor coil 11, the bridge arm converter 12, and the bidirectional bridge arm 13, respectively.

In this embodiment, the switch module 14 is added to the energy conversion device, so that the switch module 14 can facilitate the energy conversion device to switch among the driving mode, the dc charging mode and the ac charging mode, thereby effectively preventing the energy conversion device from failing due to the failure of the energy conversion device in accurate mode switching, and improving the reliability of the energy conversion device.

Further, as an embodiment of the present application, as shown in fig. 4, the charging port 10 includes a dc charging port 101 and an ac charging port 102; the switch module 14 includes a first switch unit 141 and a second switch unit 142.

The direct-current charging port 101, the first switching unit 141, the motor coil 11, the arm converter 12 and the external power battery 200 form a direct-current charging circuit; or the DC charging port 101, the first switching unit 141, the motor coil 11, the arm converter 12, the bidirectional DC module 15, and the external power battery 200 form a DC charging circuit;

the ac charging port 102, the second switching unit 142, the motor coil 11, the arm converter 12, the bidirectional arm 13, and the external power battery 200 form an ac charging circuit; or the ac charging port 102, the second switching unit 142, the motor coil 11, the arm converter 12, the bidirectional arm 13, the bidirectional DC module, and the external power battery 200 form an ac charging circuit;

the external storage battery 300, the bidirectional DC module 15, the bidirectional arm 13, the arm converter 12, the motor coil 11, the second switching unit 142, and the ac charging port 102 form an ac emergency discharging circuit; or the external storage battery 300, the bidirectional DC module 15, the arm converter 12, the motor coil 11, the first switching unit 141, and the DC charging port 101 form a DC emergency discharging circuit.

In this embodiment, by using the charging port 10 formed by the dc charging port 101 and the ac charging port 102 and using the switch module 14 formed by the first switch unit 141 and the second switch unit 142, when the energy conversion device operates in the dc charging mode and the ac charging mode, the energy conversion device has charging circuits corresponding to different modes, so that the dc charging circuit and the ac charging circuit do not interfere with each other, and the circuit has high reliability and high stability.

Further, as an embodiment of the present application, as shown in fig. 4, the first switching unit 141 includes a first switch K1 and a second switch K2, one end of the first switch K1 is connected to the dc charging port 101, and the other end is connected to the motor coil 11; one end of the second switch K2 is connected to the dc charging port 101, and the other end is connected to the bridge arm converter 12; the second switch unit 142 includes a third switch K3 and a fourth switch K4, one end of the third switch K3 is connected to the ac charging port 102, the other end is connected to the motor coil 11, one end of the fourth switch K4 is connected to the ac charging port 102, the other end is connected to the bidirectional arm 13, and specifically, is connected to a midpoint of the bidirectional arm 13.

Specifically, referring to fig. 4 again, in this embodiment, in an implementation, the first switch K1, the second switch K2, the third switch K3, and the fourth switch K4 are implemented by single-pole single-throw switches, a first end of the first switch K1 and a first end of the second switch K2 are connected to the dc charging port 101, a second end of the first switch K1 is connected to the neutral point of the motor coil 11, and a second end of the second switch K2 is connected to the negative end of the bridge arm inverter 12. Similarly, a first terminal of the third switch K3 and a first terminal of the fourth switch K4 are connected to the ac charging port 102, a second terminal of the third switch K3 is connected to the neutral point of the motor coil 11, and a second terminal of the fourth switch K4 is connected to the midpoint of the bidirectional arm 13.

In specific implementation, when the energy conversion device works in the driving mode, the first switch K1, the second switch K2, the third switch K3 and the fourth switch K4 are all turned off, and at this time, the battery 200, the bridge arm converter 12 and the motor coil 11 form a motor driving loop; when the energy conversion device works in a direct-current charging mode, the first switch K1 and the second switch K2 are closed, the third switch K3 and the fourth switch K4 are opened, and at the moment, the direct-current charging port 101, the first switch K1, the second switch K2, the motor coil 11, the bridge arm converter 12 and the external power battery 200 form a direct-current charging loop, or the direct-current charging port 101, the first switch K1, the second switch K2, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15 and the external power battery 200 form a direct-current charging loop; when the energy conversion device works in an alternating current charging mode, the third switch K3 and the fourth switch K4 are closed, the first switch K1 and the second switch K2 are opened, and at the moment, the alternating current charging port 102, the third switch K3, the fourth switch K4, the motor coil 11, the arm converter 12, the bidirectional arm 13 and the battery 200 form an alternating current charging circuit, or the alternating current charging port 102, the third switch K3, the fourth switch K4, the motor coil 11, the arm converter 12, the bidirectional arm 13, the bidirectional DC module and the external power battery 200 form an alternating current charging circuit.

Further, as an embodiment of the present application, as shown in fig. 5, the charging port 10 includes an ac/dc charging port 103, and the switch module 14 includes a third switch unit 143 and a fourth switch unit 144.

One end of the third switching unit 143 is connected to the ac/dc charging port 103, the other end is connected to the motor coil 11, one end of the fourth switching unit 144 is connected to the ac/dc charging port 103, and the other end of the fourth switching unit 144 is connected to the bridge arm converter 12 or the bidirectional bridge arm 13.

In a specific implementation, a first end of the third switching unit 143 is connected to the ac/dc charging port 103, a second end of the third switching unit 143 is connected to the neutral point of the motor coil 11, one end of the fourth switching unit 144 is connected to the ac/dc charging port 103, and the other end of the fourth switching unit is selectively connected to the negative end of the bridge arm converter 12 or the midpoint of the bidirectional bridge arm 13.

Further, when the fourth switching unit 144 is connected to the bridge arm converter 12, the ac/dc charging port 103, the third switching unit 143, the fourth switching unit 144, the motor coil 11, the bridge arm converter 12, and the external power battery 200 form a dc charging circuit; or the ac/DC charging port 103, the third switching unit 143, the fourth switching unit 144, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15, and the external power battery 200 form a DC charging circuit;

when the fourth switching unit 144 is connected to the bidirectional bridge arm 13, the ac/dc charging port 103, the third switching unit 143, the fourth switching unit 144, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13, and the external power battery 200 form an ac charging circuit; or the ac/DC charging port 103, the third switching unit 143, the fourth switching unit 144, the motor coil 11, the arm converter 12, the bidirectional arm 13, the bidirectional DC module 15, and the external power battery 200 form an ac charging circuit.

In this embodiment, by using the charging port 10 formed by the ac/dc charging port 103 and the switch module 14 formed by the third switch unit 143 and the fourth switch unit 144, when the energy conversion device operates in the dc charging mode or the ac charging mode, both an external ac power source and an external dc power source can provide charging energy to the energy conversion device through the ac/dc charging port 10, and the fourth switch unit 144 enables the energy conversion device to have dc charging circuits or ac charging circuits corresponding to different modes, so that the dc charging circuits and the ac charging circuits do not interfere with each other, and the circuit reliability, stability and circuit integration are high.

Further, as an embodiment of the present application, as shown in fig. 5, the third switching unit 143 includes a fifth switch K5, one end of the fifth switch K5 is connected to the ac/dc charging port 103, and the other end is connected to the neutral point of the motor coil 11. The fourth switch unit 144 includes a single-pole double-throw switch K6, the single-pole double-throw switch K6 includes a moving end and two immobile ends, the moving end is connected with the ac/dc charging port 103, one immobile end is connected with the bridge arm converter 12, and the other immobile end is connected with the midpoint of the bidirectional bridge arm 13; alternatively, the fourth switching unit 144 includes two switches, one end of one switch is connected to the ac/dc charging port 103, and the other end is connected to the bridge arm converter 12; one end of the other switch is connected with the alternating current/direct current charging port 103, and the other end is connected with the bidirectional bridge arm 13.

It should be noted that fig. 5 illustrates that the fourth switch unit 144 is implemented by using a single-pole double-throw switch K6, and when the fourth switch unit 144 is implemented by using two single-pole single-throw switches, first ends of the two single-pole single-throw switches are both connected to the ac/dc charging port, a second end of the first single-pole single-throw switch is connected to the negative end of the bridge arm converter 12, and a second end of the second single-pole single-throw switch is connected to the midpoint of the bidirectional bridge arm 13.

In addition, in practical implementation, when the energy conversion device operates in the driving mode, the fifth switch K5 and the single-pole double-throw switch are both turned off, and at this time, the battery 200, the bridge arm inverter 12 and the motor coil 11 form a motor driving circuit; when the energy conversion device works in a direct current charging mode, the fifth switch K5 is closed, and the first fixed end of the single-pole double-throw switch K6 is closed, at this time, the alternating current/direct current charging port 103, the fifth switch K5, the single-pole double-throw switch K6, the motor coil 11, the bridge arm converter 12 and the external power battery 200 form a direct current charging loop; when the first fixed end of the fifth switch K5 and the single-pole double-throw switch K6 is closed, the alternating current/direct current charging port 103, the fifth switch K5, the sixth switch K6, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15 and the external power battery 200 form a direct current charging circuit;

when the fifth switch K5 is closed and the other stationary end of the sixth switch K6 is closed, the ac/DC charging port 103, the fifth switch K5, the sixth switch K6, the motor coil 11, the arm converter 12, the bidirectional arm 13, and the external power battery 200 form an ac charging circuit, or the ac/DC charging port 103, the fifth switch K5, the sixth switch K6, the motor coil 11, the arm converter 12, the bidirectional arm 13, the bidirectional DC module 15, and the external power battery 200 form an ac charging circuit.

In this embodiment, the switch K5 and the single-pole double-throw switch K6 are adopted, so that the switch K5 and the single-pole double-throw switch K6 can replace the first switch K1 to the fourth switch K4 in another embodiment, and further, when switching among the driving mode, the direct-current charging mode and the alternating-current charging mode is realized, electronic components used by the switch module 14 are reduced, so that the number of electronic components of the energy conversion device is reduced, the cost of the energy conversion device is reduced, and meanwhile, the circuit structure is simpler.

Further, as an embodiment of the present application, as shown in fig. 7 or fig. 8, the energy conversion device further includes a first capacitor C1, and the first capacitor C1 is connected in parallel with the bidirectional bridge arm 13.

Specifically, as shown in fig. 8, first capacitor C1 is connected in parallel with bridge arm converter 12 and bidirectional bridge arm 13.

Specifically, when the energy conversion device operates in the dc charging mode or the ac charging mode, the first capacitor C1 filters the voltage output by the bridge arm converter 12 or the bridge arm converter 12 and the bidirectional bridge arm 13 during the dc charging process or the ac charging process of the battery 200, and stores energy according to the voltage output by the bridge arm converter 12 or the bridge arm converter 12 and the bidirectional bridge arm 13, so as to complete the dc charging or the ac charging of the battery 200.

In this embodiment, the first capacitor C1 is arranged in the energy conversion device, so that the first capacitor C1 can filter the voltage output by the bridge arm converter 12 or the bridge arm converter 12 and the bidirectional bridge arm 13, and can store energy according to the voltage output by the bridge arm converter 12 or the bridge arm converter 12 and the bidirectional bridge arm 13 to complete the dc charging or ac charging of the battery 200, thereby ensuring that the normal charging function of the energy conversion device is ensured, and other noise waves can not interfere with the charging process; in addition, when the energy conversion device works in the motor driving mode, the capacitor C1 can be used as a capacitor of a motor controller, so that the capacitor C1 can be used as a PFC capacitor and can also be used as a capacitor of the motor controller for multiplexing, the utilization rate of electronic elements in the energy conversion device is improved, and the structure of the energy conversion device is simplified.

Further, as an embodiment of the present application, as shown in fig. 6, the switch module further includes a fifth switch unit 145, where one end of the fifth switch unit 145 is connected to the external power battery 200, and the other end is connected between the bidirectional arm 13 and the bidirectional DC module 15.

In the present embodiment, by adding the fifth switching unit 145 to the switching module and connecting the battery 200 to the bidirectional arm 13 and the bidirectional DC module 15 through the fifth switching unit 14, when the front-end circuit of the energy conversion device fails (for example, when any one of the switching module 14, the motor coil 11, the arm converter 12, and the bidirectional arm 13 fails), the damage of the external power battery 200 can be avoided by controlling the fifth switching unit 145, and the service life of the external power battery 200 is improved.

Further, as an embodiment of the present application, as shown in fig. 7, the fifth switching unit 145 includes a switch K7 and a switch K8. The first end of the switch K7 is connected with the positive electrode of the external power battery 200, the first end of the switch K8 is connected with the negative electrode of the external power battery 200, the second end of the switch K7 is connected with the first direct current end of the bidirectional DC module 15 and the positive end of the bidirectional bridge arm 13, and the second end of the switch K8 is connected with the first direct current end of the bidirectional DC module 15 and the negative end of the bidirectional bridge arm 13.

Further, as an embodiment of the present application, as shown in fig. 6, the switch module 14 further includes a sixth switch unit 146, one end of the sixth switch unit 146 is connected to the bidirectional DC module 15, and the other end is connected to the external power battery 200.

In this embodiment, the sixth switching unit 146 is additionally arranged in the switching module 14, so that the bidirectional DC module 15 and the sixth switching unit 146, the charging port 10, the motor coil 11 and the bidirectional DC module 15 in the energy conversion device form an additional ac or DC charging circuit, thereby enriching the ac/DC charging mode of the energy conversion device, and when the energy conversion device is performing DC charging, not only isolated DC charging but also non-isolated DC charging can be performed, and further the charging process of the energy conversion device can be multi-scheme redundant, thereby improving the safety of the energy conversion device in the ac charging process.

Further, as an embodiment of the present application, as shown in fig. 7, the sixth switching unit 146 includes a switch K9 and a switch K10. Wherein, the first terminal of the switch K9 is connected with the positive pole of the external power battery 200, the first terminal of the switch K10 is connected with the negative pole of the external power battery 200, the second terminal of the switch K9 is connected with the second direct current terminal of the bidirectional DC module 15, and the second terminal of the switch K10 is connected with the second direct current terminal of the bidirectional DC module 15.

Further, as an embodiment of the present application, as shown in fig. 6, the bidirectional DC module 15 further includes a third DC terminal, and the third DC terminal is connected to the vehicle-mounted discharge port.

In this embodiment, by using the bidirectional DC module 15 including the third direct current end, the bidirectional DC module 15 can be connected to the vehicle-mounted discharge port through the third direct current end, and then the energy conversion device can supply power to the external device through the vehicle-mounted discharge port, so that the working modes of the energy conversion device are enriched, and the application range of the energy conversion device is improved.

In addition, in the embodiment of the present application, the bidirectional DC module 15 can be used to charge the battery, charge the storage battery, discharge the vehicle load, perform emergency driving, and so on, that is, the bidirectional DC module 15 is reused in different operating modes of the energy conversion device, so that different circuits do not need to be added in different operating modes, and the complexity and cost of the energy conversion device are reduced.

Further, as an embodiment of the present application, as shown in fig. 6, the bidirectional DC module 15 includes a first converter 151, a second converter 152, a third converter 153, and a voltage transforming unit 154. The primary side, the first secondary side and the second secondary side of the transformation unit 154 are respectively connected with the first converter 151, the second converter 152 and the third converter 153, that is, the primary side of the transformation unit 154 is connected with the first converter 151, the first secondary side of the transformation unit 151 is connected with the second converter 152, the second secondary side of the transformation unit 154 is connected with the third converter 153, the first converter 151 is connected with the bidirectional bridge arm 13 in parallel, the second converter 152 is connected with the external power battery 200 in parallel, and the third converter 153 is connected with the storage battery 300 and/or the vehicle-mounted discharge port in parallel.

In this embodiment, by using the bidirectional DC module 15 including the first converter 151, the second converter 152, the third converter 153 and the transforming unit 154, when the energy conversion device is in operation, another ac or DC charging circuit can be formed by the charging port 10, the motor coil 11, the arm converter 12, the bidirectional arm 13, the first converter 151, the transforming unit 154, the second converter 152, the sixth switching unit 146 and the external power battery 200, so as to realize another ac or DC charging; the charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13, the first converter 151, the voltage transformation unit 154, the third converter 153 and the storage battery or the vehicle-mounted discharging port form a storage battery charging circuit or a vehicle-mounted discharging port circuit, so that the other alternating current charging circuit and the storage battery charging circuit, namely the vehicle-mounted discharging port circuit, cannot interfere with each other when in work, and the reliability of the circuit is improved.

Further, as an embodiment of the present application, as shown in fig. 6, the third converter 153 includes a first sub-converter 153a and a second sub-converter 153b, and the first sub-converter 153a and the second sub-converter 153b are both connected to the second sub-side of the voltage transformation unit 154.

Specifically, the operation mode of the third converter 153a includes a first state in which the first sub-converter 153a and the second sub-converter 153b operate simultaneously, and a second state in which the first sub-converter 153a and the second sub-converter 153b operate in a switching manner. That is, when the third converter 153 operates, the first sub-converter 153a inside thereof may function as a converter alone for use, or the second sub-converter 153b may function as a converter alone for use, or the first sub-converter 153a and the second sub-converter 153b may operate simultaneously to perform a converter function of the third converter 153.

In this embodiment, the third converter 153 is implemented by using a first sub-converter 153a and a second sub-converter 153b, so that when the energy conversion device works, any one of the first sub-converter 153a and the second sub-converter 153b can complete the function of the third converter 153, and further, when any one of the first sub-converter 153a and the second sub-converter 153b fails, the energy conversion device is not affected; in addition, when the first sub-converter 153a and the second sub-converter 153b simultaneously perform the function of the third converter 153, the rectification capability of the third converter 153 may be enhanced.

Further, as an embodiment of the present application, as shown in fig. 7, the first converter 151 includes switching units Q3, Q4, Q5, Q6, an inductor L2, a capacitor C2, and a switch K12. The switching units Q3, Q4, Q5 and Q6 form a full-bridge rectifying circuit, the input end of the switching unit Q3 and the input end of the switching unit Q5 are connected in common to form a first direct current end of the bidirectional DC module 15, and the output end of the switching unit Q4 and the output end of the switching unit Q6 are connected in common to form a first direct current end of the bidirectional DC module 15; the output end of the switch unit Q3 is connected with the input end of the switch unit Q4 and the first end of the capacitor C2, the second end of the capacitor C2 is connected with the primary side of the transformation unit 154, the output end of the switch unit Q5 is connected with the input end of the switch unit Q6 and the first end of the inductor L2, the second end of the inductor L2 is connected with the first end of the switch K12, and the second end of the switch K12 is connected with the primary side of the transformation unit 154.

Further, as an embodiment of the present application, as shown in fig. 7, the second converter 152 includes a switch unit Q7, Q8, Q9, Q10, an inductor L3, a capacitor C3, and a switch K13. The switching units Q7, Q8, Q9 and Q10 form a full-bridge rectification circuit, the input end of the switching unit Q7 and the input end of the switching unit Q9 are connected in common to form a second direct current end of the bidirectional DC module 15, and the output end of the switching unit Q8 and the output end of the switching unit Q10 are connected in common to form a second direct current end of the bidirectional DC module 15; an output end of the switch unit Q9 is connected with an input end of the switch unit Q10 and a first end of the capacitor C3, a second end of the capacitor C3 is connected with a first secondary side of the transforming unit 154, an output end of the switch unit Q7 is connected with an input end of the switch unit Q8 and a first end of the inductor L3, a second end of the inductor L3 is connected with a first end of the switch K13, and a second end of the switch K13 is connected with a first secondary side of the transforming unit 154.

Further, as an embodiment of the present application, as shown in fig. 7, the first sub-transformer 153a includes switching units Q11 and Q12, and the second sub-transformer 153b includes switching units Q13 and Q14. The input terminals of the switching units Q11, Q12, Q13 and Q14 are all connected to the second secondary side of the transformer unit 154, and the output terminals of the switching units Q11, Q12, Q13 and Q14 are connected to the ground.

In the embodiment of the present application, the plurality of switch units included in the bidirectional DC module 15 may be implemented by devices that are connected in parallel with diodes and can perform switching operations, such as power transistors, Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs), insulated Gate Bipolar transistors (IGTs), and other switch devices.

Further, as an embodiment of the present application, as shown in fig. 7, the transforming unit 154 includes a transformer T1, the primary side of the transformer T1 is the primary side of the transforming unit 154, the first secondary side of the transformer T1 is the first secondary side of the transforming unit 154, the second secondary side of the transformer T1 is the second secondary side of the transforming unit 154, and the second secondary side constitutes the third DC terminal of the bidirectional DC module 15.

Further, as an embodiment of the present invention, as shown in fig. 8, the energy conversion device further includes a voltage inductor L1, and one end of the inductor L1 is connected to the external charging port 10, and the other end is connected to the motor coil 11.

Specifically, the external charging port 10, the inductor L1, the motor coil 11, the bridge arm inverter 12, and the external power battery 200 form a dc charging circuit; or, the external charging port 10, the inductor L1, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15, and the external power battery 200 form a DC charging circuit;

an external charging port 10, an inductor L1, a motor coil 11, an arm converter 12, a bidirectional arm 13 and an external power battery 200 form an alternating current charging circuit; or external charging port 10, inductance L1, motor coil 11, arm converter 12, bidirectional arm 13, bidirectional DC module 15, and external power battery 200 form an ac charging circuit.

Specifically, as an embodiment of the present application, as shown in fig. 8, a first terminal of an inductor L1 is connected to a second terminal of a switch K1 and a second terminal of a switch K3, and a second terminal of the inductor L1 is connected to a neutral point of a three-phase winding of the motor coil 11.

In the present embodiment, when the energy conversion device operates in the ac charging mode, the inductor L1 cooperates with the bidirectional arm 13 to convert the ac power received by the charging port 10 into the target voltage and then ac-charge the external power battery 200, that is, when an ideal voltage needs to be output to charge the external power battery 200 during the charging process of the external power battery 200, the output voltage during the charging process can be adjusted by the cooperation of the inductor L1 and the bidirectional arm 13 to ensure the voltage conversion function of the energy conversion device.

Further, as an embodiment of the present application, as shown in fig. 9, the bidirectional DC module 15 includes a first DC/DC conversion unit 155 and a second DC/DC conversion unit 156.

One end of the first DC/DC conversion unit 155 is connected to the bidirectional bridge arm 13, and the other end is connected to the sixth switching unit 146;

second DC/DC conversion section 156 has one end connected to bidirectional arm 13 and the other end connected to battery 300.

In this embodiment, by using the bidirectional DC module 15 including the first DC/DC conversion unit 155 and the second DC/DC conversion unit 156, the bidirectional DC module 15 can be connected to the external power battery 200 through the first DC/DC conversion unit 155, and connected to the storage battery 300 through the second DC/DC conversion unit 156, so that the energy conversion device can be driven by the energy provided by the storage battery, and can be charged to the battery, thereby enriching the operation mode of the energy conversion device and increasing the application range of the energy conversion device.

Further, in specific implementation, as shown in fig. 9, the first DC/DC conversion unit 155 includes a switching tube Q3 to a switching tube Q10, an inductor L2 and an inductor L3, a capacitor C2 and a capacitor C3, a switch K12 and a switch K13, and a transformer T1, and connection relationships between a switching tube Q3 to a switching tube Q10, an inductor L2 and an inductor L3, and a capacitor C2 and a capacitor C3, a switch K12 and a switch K13 are the same as connection relationships between the first converter 151 and the second converter 152 shown in fig. 7, so that reference may be made to the related description of fig. 7, and description is not repeated here, and connection relationships between the transformer T1 and other devices may refer to the specific diagram of fig. 9, and are not repeated here.

In addition, the second DC/DC conversion unit 156 includes a switching tube Q31, a switching tube Q41, a switching tube Q51, a switching tube Q61, a switching tube Q11, a switching tube Q12, a switching tube Q13, a switching tube Q14, an inductor L21, a capacitor C21, and a transformer T2, and connection relationships among the switching tube Q31, the switching tube Q41, the switching tube Q51, the switching tube Q61, the switching tube Q11, the switching tube Q12, the switching tube Q13, the switching tube Q14, the inductor L21, the capacitor C21, and the transformer T2 may refer to specific illustrations in fig. 7, and description thereof is omitted.

In the present application, through the bidirectional DC module 15 shown in fig. 9, when the energy conversion device cannot normally output current due to serious power feeding of the external power battery 200 or a failure of the external power battery 200, the fifth switching unit 145 and the sixth switching unit 146 may be turned off, so that the storage battery supplies power to the motor through the bidirectional DC module 15 and the bridge arm converter 12, thereby driving the motor and realizing emergency driving.

Further, as an embodiment of the present application, as shown in fig. 7 or fig. 8, the energy conversion apparatus further includes a switch K11 and a resistor R1, and the switch K11 and the resistor R1 form a pre-charge module to pre-charge the switch K7 and the switch K9 when the energy conversion apparatus is in operation, so as to prevent the switch K7 and the switch K9 from malfunctioning, thereby reducing the failure rate of the energy conversion apparatus.

Specifically, as shown in fig. 7 or 8, the first terminal of the switch K11 is connected to the second terminal of the switch K7, the second terminal of the switch K11 is connected to the second terminal of the switch K9 and the first terminal of the resistor R1, and the second terminal of the resistor R1 is connected to the first terminal of the switch K7, the first terminal of the switch K9, and the positive electrode of the battery 200.

Further, as an embodiment of the present invention, as shown in fig. 7 or 8, the arm converter 12 in the energy conversion device includes a first phase arm, a second phase arm, and a third phase arm connected in parallel.

The first phase bridge arm comprises a first power switch unit 1 and a second power switch unit 2 which are connected in series, and the middle points of the first power switch unit 1 and the second power switch unit 2 are connected with a first phase coil of the motor coil 11;

the second phase bridge arm comprises a third power switch unit 3 and a fourth power switch unit 4 which are connected in series, and the middle points of the third power switch unit 3 and the fourth power switch unit 4 are connected with a second phase coil of the motor coil 11;

the third phase bridge arm comprises a fifth power switch unit 5 and a sixth power switch unit 6 which are connected in series, and the middle points of the fifth power switch unit 5 and the sixth power switch unit 6 are connected with a third phase coil of the motor coil 11;

the first end of the first power switch unit 1, the first end of the third power switch unit 3 and the first end of the fifth power switch unit 5 are connected in common to form a positive end of a bridge arm converter 12, and the positive end of the bridge arm converter 12 is connected with the positive end of a bidirectional bridge arm 13;

the second end of the second power switch unit 2, the second end of the fourth power switch unit 4 and the second end of the sixth power switch unit 6 are connected together to form a negative end of the bridge arm converter 12, and the negative end of the bridge arm converter 12 is connected with the negative end of the bidirectional bridge arm 13.

In the embodiment of the present application, the plurality of power switch cells in the bridge arm converter 12 may be implemented by devices that are connected in parallel with diodes and can perform switching operations, such as power transistors, Metal-Oxide-Semiconductor Field-Effect transistors (MOSFETs), Insulated Gate Bipolar Transistors (IGBTs), and other switching devices.

Further, when the bridge arm converter 12 operates, the power switch unit in the first phase bridge arm, the power switch unit in the second phase bridge arm and the power switch unit in the third phase bridge arm sequentially receive the control signal with the preset phase difference to enter a three-phase staggered control mode; it should be noted that, in the present embodiment, the preset phase is preferably 120 degrees, and the preferred angle does not limit the preset phase.

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 is charged, an equivalent inductance value is effectively increased, and further, the charging power is increased, and an inductance L1 does not need to be added to the energy conversion device, so that the number of electronic components in the energy conversion device is reduced, and the cost of the energy conversion device is reduced.

Further, as an embodiment of the present invention, as shown in fig. 7 or 8, the bidirectional arm 13 in the energy conversion device includes a fourth-phase arm, and includes a seventh power switch cell Q1 and an eighth power switch cell Q2 connected in series, one end of the fourth-phase arm is connected to the positive terminal of the arm converter 12, the other end of the fourth-phase arm is connected to the negative terminal of the arm converter 12, and the midpoint between the seventh power switch cell Q1 and the eighth power switch cell Q2 is connected to the external charging port 10.

The operation principle of the energy conversion device provided by the present application in different embodiments is specifically described below by taking the circuits shown in fig. 7 and 8 as examples, and the following details are described below:

specifically, as shown in fig. 8, when the energy conversion device operates in the dc charging mode, and the dc charging mode is non-isolated dc charging, the first switch K1, the second switch K2, the switch K11, the switch K7, and the switch K8 are closed, and the other switch elements are opened, and at this time, the dc voltage received by the dc charging port 101 is boosted through the inductor L1, the three-phase winding U, V, W of the motor coil 11, and the arm converter 12, and then output to the external power battery 200 through the capacitor C1, so as to implement dc charging of the external power battery 200.

Or as shown in fig. 7, when the energy conversion device operates in the dc charging mode, and the dc charging mode is non-isolated dc charging, the first switch K1, the second switch K2, the switch K11, the switch K7, and the switch K8 are closed, and the other switch elements are opened, and at this time, the dc voltage received by the dc charging port 101 is boosted by the three-phase winding U, V, W of the motor coil 11 and the arm converter 12, and then output to the external power battery 200 through the capacitor C1, so as to realize dc charging of the external power battery 200.

In addition, when the energy conversion device works in a DC charging mode and the DC charging mode is isolated DC charging, as shown in fig. 8, the first switch K1, the second switch K2, the switch K9, the switch K10, the switch K12 and the switch K13 are engaged, when other switching elements are turned off, the dc voltage received by the dc charging port 101 is pumped into the three-phase winding U, V, W of the motor coil 11 from the motor through the inductor L1, and then is boosted by the bridge arm converter 12 to output a voltage U0, the voltage U0 is filtered by a capacitor C1, then is subjected to full-bridge rectification by switching tubes Q3, Q4, Q5 and Q6 and then is output to a transformer T1, and after inversion by a transformer T1 and rectification by switching tubes Q7, Q8, Q9 and Q10, outputting voltage to the external power battery 200 through the filter capacitor C4 to realize isolated dc charging of the external power battery 200; it should be noted that, in this embodiment, the isolated dc charging is mainly used when the voltage of the battery of the electric vehicle is difficult to match with the voltage of the special charging facility, and needs to be adjusted through two-stage voltage regulation.

Or as shown in fig. 7, the first switch K1, the second switch K2, the switch K9, the switch K10, the switch 12 and the switch K13 are closed, and other switch elements are opened, at this time, the dc voltage received by the dc charging port 101 is pumped from the motor into the three-phase winding U, V, W of the motor coil 11, and then is boosted by the bridge arm converter 12 to output a voltage U0, the voltage U0 is filtered by the capacitor C1, then is rectified by the switch tubes Q3, Q4, Q5 and Q6 to be outputted to the transformer T1 in a full bridge manner, and is rectified by the transformer T1, the switch tubes Q7, Q8, Q9 and Q10 to output a voltage to the external power battery 200 by the filter capacitor C4, so as to realize isolated dc charging of the external power battery 200.

Further, as shown in fig. 8, when the energy conversion device operates in the ac charging mode, the third switch K3, the fourth switch K4, the switch K11, the switch K9, the switch K10, the switch K12 and the switch K13 are pulled in, and other switch elements are turned off, at this time, one end of the ac voltage received by the ac charging port 102 enters the three-phase winding U, V, W of the motor coil 11 through the neutral line led out from the neutral point of the motor through the inductor L1, and then enters the arm converter 102, and the other end passes through the bidirectional arm Q1 and Q2, and then forms a full-bridge rectified output voltage U0 through the arm Q1, the Q2 and the arm converter 102, the voltage U0 is rectified through the capacitor C1 and then rectified through the full bridge consisting of Q3 to Q6, and then is inverted through the transformer T1, and then rectified through the full bridge consisting of Q7 to Q10 and filtered and then outputs the voltage to the external power battery 200 through the capacitor C4, to enable ac charging of the external power cell 200.

Or, when the energy conversion device works in the ac charging mode, the third switch K3, the fourth switch K4, the switch K11, the switch K7 and the switch K8 are closed, and the other switches are opened, at this time, one end of the ac voltage received by the ac charging port 102 enters the three-phase winding U, V, W of the motor coil 11 through the inductor L1 and the neutral line led out from the neutral point of the motor, and then enters the arm converter 12, and the other end of the ac voltage passes through the arms Q1 and Q2, and then forms a full-bridge rectified output voltage U0 through the arms Q1 and Q2 and the arm converter 12, and the voltage U0 filters through the capacitor C1 and then charges the external power battery 200, so as to realize the ac charging of the external power battery 200.

Or as shown in fig. 7, when the energy conversion device operates in the ac charging mode, the third switch K3, the fourth switch K4, the switch K11, the switch K9, the switch K10, the switch K12 and the switch K13 are attracted, and other switch elements are disconnected, at this time, a neutral line led out from a neutral point of the motor at one end of an ac voltage received by the ac charging port 102 enters a three-phase winding U, V, W of the motor coil 11, and then enters the bridge arm inverter 102, and the other end passes through the first bridge arm Q1 and Q2, and then a full-bridge rectified output voltage U0 is formed by the bridge arm Q1 and Q2 and the bridge arm inverter 102, the voltage U0 is rectified by a full bridge composed of Q3 to Q6 after being filtered by a capacitor C1, inverted by a transformer T1, and then rectified by a full bridge composed of Q7 to Q10 and filtered by a capacitor C4 to output voltage to the external power battery 200, to enable ac charging of the external power battery 200;

or the third switch K3, the fourth switch K4, the switch K11, the switch K7 and the switch K8 are attracted, and other switches are disconnected, at this time, one end of the alternating current voltage received by the alternating current charging port 102 enters the three-phase winding U, V, W of the motor coil 11 from a neutral line led out from a neutral point of the motor, then enters the bridge arm converter 12, the other end of the alternating current voltage passes through the bridge arms Q1 and Q2, then the bridge arms Q1 and Q2 and the bridge arm converter 12 form a full-bridge rectified output voltage U0, and the voltage U0 is filtered by the capacitor C1 to output voltage to charge the external power battery 200, so that alternating current charging of the external power battery 200 is realized.

In this embodiment, the energy conversion device provided by the present application controls on/off of each switch, so that ac power received by ac charging port 102 is ac-charged to external power battery 200 through inductor L1, motor coil 11, arm converter 12, and bidirectional arm 13, and the ac charging mode is not limited to one, that is, the ac charging mode of the energy conversion device is multi-scheme redundant, and the operating voltage can be automatically adjusted, so that charging efficiency is improved, and the ac charging function of the energy conversion device can be effectively ensured.

Further, as shown in fig. 8, when the energy conversion device operates in the ac discharging mode, the second switching unit 142 and the sixth switching unit 146 are turned on, and the first switching unit 141 and the fifth switching unit 145 are turned off, so that the high-voltage DC output from the battery 200 is discharged to the outside through the ac charging port 102 by the inductor L1, the motor coil 11, the arm converter 12, the bidirectional arm 13, and the bidirectional DC module 15; or

When the energy conversion device operates in the ac charging mode, the second switching unit 142 and the fifth switching unit 145 are turned on, and the first switching unit 141 and the sixth switching unit 146 are turned off, so that the high-voltage dc output by the battery 200 is discharged to the outside through the ac charging port 102 by the inductance L1, the motor coil 11, the arm converter 12, and the bidirectional arm 13.

Further, as shown in fig. 7, when the energy conversion device operates in the ac discharging mode, the second switching unit 142 and the sixth switching unit 146 are turned on, and the first switching unit 141 and the fifth switching unit 145 are turned off, so that the high-voltage DC output by the battery 200 is discharged to the outside through the ac charging port 102 by the motor coil 11, the arm converter 12, the bidirectional arm 13, and the bidirectional DC module 15; or

When the energy conversion device operates in the ac discharging mode, the second switching unit 142 and the fifth switching unit 145 are turned on, and the first switching unit 141 and the sixth switching unit 146 are turned off, so that the high-voltage dc output by the battery 200 is discharged to the outside through the ac charging port 102 by the motor coil 11, the arm converter 12, and the bidirectional arm 13.

It should be noted that, in this embodiment, the principle of the ac discharging operation mode of the energy conversion device is opposite to that of the ac charging operation mode thereof, and therefore, the specific operation process of the ac charging operation mode of the energy conversion device may be referred to for the specific operation principle of the ac discharging operation mode of the energy conversion device, and is not described herein again.

In addition, the energy conversion device provided by the application can work in an alternating current charging mode and an alternating current discharging mode, so that when the energy conversion device is arranged on two vehicles at the same time, one vehicle can carry out alternating current discharging, and the other vehicle can carry out alternating current charging, so that the vehicles can be charged oppositely.

Further, as shown in fig. 8 or fig. 7, when the energy conversion device operates in the motor driving mode, the switch K11, the switch K7, and the switch K8 are closed, and the other switches are opened, and at this time, the external power battery 200 outputs high-voltage direct current, which outputs three-phase alternating current to the three-phase windings of the motor coil 11 through the three-phase motor driving bridge of the bridge arm inverter 12, so as to drive the motor.

In the embodiment, the motor coil 11, the arm converter 12, the bidirectional arm 13 and the bidirectional DC module 15 are integrated in one circuit, so that the energy conversion device can drive the vehicle motor and perform ac charging and discharging of the vehicle battery, thereby improving the circuit integration level, reducing the circuit cost and the circuit volume, and having a simple circuit structure.

Further, as shown in fig. 8, when the energy conversion device operates in the dc external discharge mode, the switch K11, the switch K7, the switch K8, the switch K1, and the switch K2 are turned on, and the other switches are turned off, so that the dc output from the external power battery 200 is discharged to the outside by the three-phase motor driving bridge of the bridge arm converter 12, the three-phase winding U, V, W of the motor coil 15, the inductor L1, and the dc charging port 101.

Further, as shown in fig. 8, when the energy conversion device operates in the driving discharging mode, the switch K11, the switch K7, the switch K8, and the switch K12 are closed, and the other switches are opened, at this time, a part of the high voltage output by the external power battery 200 is output to the three-phase motor driving bridge of the bridge arm inverter 12 through the capacitor C1, the high voltage is converted by the three-phase motor driving bridge to drive the three-phase winding of the motor coil 15, the other part of the high voltage is output to the full bridge circuit composed of the switch Q3 to the switch Q6, and the high voltage is rectified by the full bridge circuit, then is converted by the transformer T1, the capacitor C2, and the inductor L2, is rectified by the full bridge circuit composed of the switch Q11 to the switch Q14, and then is output to the vehicle-mounted discharging port through the capacitor filter;

when the energy conversion device works in a driving discharge mode, the switch K11, the switch K9, the switch K10 and the switch K13 are switched on, and other switches are switched off, at the moment, part of high-voltage electricity output by the external power battery 200 passes through the capacitor C1 and is output to a three-phase motor driving bridge of the bridge arm converter 12, the high-voltage electricity is converted by the three-phase motor driving bridge to drive a three-phase winding of a motor coil 15, the other part of high-voltage electricity outputs a full-bridge circuit consisting of the switch Q7 to the switch Q10, the high-voltage electricity is rectified by the full-bridge circuit, converted by the transformer T1, the capacitor C3 and the inductor L3, rectified by the full-bridge circuit from the switch Q11 to the switch Q14, and then 13.8V low-voltage direct current voltage is output to a;

or when the energy conversion device works in a driving discharge mode, the switch K11, the switch K7, the switch K8, the switch K9, the switch K10, the switch K12 and the switch K13 are attracted, and other switches are disconnected, at this time, a part of high-voltage electricity output by the external power battery 200 is output to a three-phase motor driving bridge of the bridge arm converter 12 through a capacitor C1, the three-phase motor driving bridge is converted to drive a three-phase winding of the motor coil 15, the other part of the high-voltage electricity is output to a full-bridge circuit composed of the switches Q3 to Q6, the high-voltage electricity is rectified through the full-bridge circuit, then is rectified through a transformer T1, a capacitor C2 and an inductor L2, is rectified through the full-bridge circuit composed of the switches Q11 to Q14, a low-voltage direct current voltage of 13.8V is output to a vehicle-mounted discharge port through capacitor filtering, and the full-bridge circuit composed of the switches Q7 to Q10, and the low-voltage direct-current voltage is converted by a transformer T1, a capacitor C3 and an inductor L3, rectified by a full-bridge circuit from a switch Q11 to a switch Q14, and filtered by a capacitor to output 13.8V low-voltage direct-current voltage to a vehicle-mounted discharge port.

In this embodiment, the energy conversion device provided by the present application enables the high-voltage direct current output by the external power battery 200 to drive the motor to work under the action of the bridge arm converter 12, the bidirectional bridge arm 13 and the bidirectional DC module 15 by controlling on/off of each switch, and the high-voltage direct current output by the external power battery 200 outputs the low-voltage direct current under the action of the bidirectional DC module 15, so that one circuit can be used for both motor driving and direct current discharging.

Further, as shown in fig. 8, when the energy conversion device operates in the DC discharge mode, the switch K9, the switch K10, the switch K11, and the switch K13 are closed, and the others are opened, at this time, the high voltage output by the external power battery 200 is output to the full bridge circuit composed of the switches Q7 to Q10 through the capacitor C4, rectified by the full bridge circuit, converted by the inductor L3, the capacitor C3, and the transformer T1, rectified again by the switches Q11 to Q14, and filtered by the capacitor C5 to output 13.8V low voltage DC voltage to the vehicle discharge port;

or the switch K7, the switch K8, the switch K11 and the switch K12 are attracted, and other switches are disconnected, at this time, high-voltage power output by the external power battery 200 is output to a full-bridge circuit consisting of the switch Q3 to the switch Q6 through the capacitor C1, rectified by the full-bridge circuit, converted by the inductor L2, the capacitor C2 and the transformer T1, rectified again from the switch Q11 to the switch Q14, and filtered by the capacitor C5 to output 13.8V low-voltage direct-current voltage to a vehicle-mounted discharge port;

or the switch K7, the switch K8, the switch K9, the switch K10, the switch K11, the switch K12 and the switch K13 are attracted, and the other switches are turned off, at this time, the high voltage output by the external power battery 200 is output to the full bridge circuit composed of the switch Q7 to the switch Q10 through the capacitor C4, and after being rectified by the full bridge circuit, then the voltage is converted by an inductor L3, a capacitor C3 and a transformer T1, rectified again from a switch Q11 to a switch Q14, the low-voltage direct-current voltage of 13.8V is filtered and output to a vehicle-mounted discharge port through a capacitor C5, and the high-voltage power output by the external power battery 200 is output to a full-bridge circuit consisting of a switch Q3 and a switch Q6 through a capacitor C1, rectified by the full-bridge circuit, and the low-voltage direct current is converted by an inductor L2, a capacitor C2 and a transformer T1, rectified again from a switch Q11 to a switch Q14, filtered by a capacitor C5 and output to a vehicle-mounted discharge port at 13.8V.

In this embodiment, the energy conversion apparatus provided by the present application enables the high-voltage DC output by the battery 200 to output the low-voltage DC under the action of the bidirectional DC module 15 by controlling on/off of each switch in the circuit, and different DC output paths can be selected in the process of outputting the DC, so as to avoid the problem that the circuit cannot perform DC discharge when only one DC discharge path is provided and the path fails.

Further, as shown in fig. 8, when the energy conversion device operates in the intelligent charging mode, the switch K9, the switch K10, the switch K11, and the switch K13 are closed, and the other switches are opened, at this time, the high-voltage capacitor C4 output by the external power battery 200 is output to the full-bridge circuit composed of the switches Q7 to Q10, rectified by the full-bridge circuit, converted by the inductor L3, the capacitor C3, and the transformer T1, rectified again by the switches Q11 to the switch Q14, and filtered by the capacitor C5 to output 13.8V low-voltage dc voltage, so that the 13.8V low-voltage dc voltage is charged to the storage battery;

or the switch K9, the switch K10, the switch K11 and the switch K12 are attracted, and the other switches are disconnected, at this time, the high-voltage capacitor C1 output by the external power battery 200 is output to a full-bridge circuit consisting of the switches Q3 to Q6, rectified by the full-bridge circuit, converted by the inductor L2, the capacitor C2 and the transformer T1, rectified again by the switch Q11 to the switch Q14, and filtered by the capacitor C5 to output 13.8V low-voltage direct-current voltage, so that the 13.8V low-voltage direct-current voltage charges the storage battery;

or the switch K7, the switch K8, the switch K9, the switch K10, the switch K11, the switch K12 and the switch K13 are pulled in, and the switches K1 to K4 are disconnected, at this time, the high-voltage capacitor C1 output by the external power battery 200 is output to a full-bridge circuit composed of the switches Q3 to Q6, rectified by the full-bridge circuit, then converted by the inductor L2, the capacitor C2 and the transformer T1, rectified again by the switch Q11 to the switch Q14, and filtered by the capacitor C5 to output 13.8V low-voltage dc voltage, so that the 13.8V low-voltage dc voltage is charged to the battery, and the high-voltage capacitor C4 output by the external power battery 200 is output to the full-bridge circuit composed of the switches Q4 to the switch Q4, rectified by the full-bridge circuit, rectified by the inductor L4, the capacitor C4 to the switch Q4, rectified by the switch Q4, and rectified by the capacitor C3613.8V filtered dc voltage, so that the 13.8V low-voltage direct-current voltage charges the storage battery.

In this embodiment, the energy conversion device provided by the present application enables the high-voltage direct current output by the battery 200 to output the low-voltage direct current under the action of the bidirectional DC module 15 by controlling the on/off of each switch, and the storage battery can be charged by the output direct current, so as to realize the intelligent charging of the energy conversion device.

Further, as shown in fig. 8, when the energy conversion device operates in the ac external emergency discharging mode, the switch K3, the switch K4 and the switch K12 are closed, and the switch K1, the switch K2, the switches K7 to K11 and the switch K13 are turned off, at this time, the low-voltage direct current output by the storage battery passes through the filter capacitor C5 and is rectified by a full-bridge circuit consisting of the switch Q11 to the switch Q14, after being converted by a transformer T1, an inductor L2 and a capacitor C2, the rectified voltage is output to a capacitor C1 after being rectified by a bridge type rectifying circuit consisting of a switch Q3 and a switch Q6, and after being filtered by a capacitor C1, after the alternating current is converted by a three-phase motor driving bridge of the bridge arm converter 12 and a circuit formed by a switch Q1 and a switch Q2, the alternating current is filtered by a three-phase winding of a motor coil 11 and an inductor L1, alternating current is output through the alternating current charging port 102 for use outside the vehicle to realize an alternating current-to-outside emergency discharging mode of the energy conversion device.

Alternatively, as shown in fig. 7, when the circuit 100 operates in the ac external emergency discharging mode, the switch K3, the switch K4 and the switch K12 are closed, and the switch K1, the switch K2, the switch K7 to the switch K11 and the switch K13 are disconnected, at this time, the low-voltage direct current output by the storage battery passes through the filter capacitor C5 and then is rectified by a full-bridge circuit consisting of the switch Q11 to the switch Q14, then after the conversion by the transformer T1, the inductor L2 and the capacitor C2, the rectified current of a bridge rectifier circuit consisting of the switch Q3 to the switch Q6 is output to the capacitor C1, after the filtering by the capacitor C1, after the alternating current is converted by a three-phase motor drive bridge of the bridge arm converter 120 and a circuit formed by a switch Q1 and a switch Q2, the alternating current is filtered by a three-phase winding of the motor coil 11, the ac power is output via ac charging port 102 for off-board use to implement an ac-to-external emergency discharge mode of circuit 100.

In this embodiment, when the battery 200 fails and is unavailable, the energy conversion device provided by the present application controls on/off of each switch, so that the low-voltage direct current output by the storage battery is supplied with an alternating current through the alternating current charging port 102 to the outside under the action of the bidirectional DC module 15, the bidirectional arm 13, the arm converter 12, the motor coil 11, and the like, thereby realizing emergency discharging of the alternating current of the energy conversion device to the outside.

Further, as shown in fig. 8, when the energy conversion device operates in the dc-to-ac emergency discharging mode, the switch K1, the switch K2 and the switch K12 are engaged, and the switch K3, the switch K4, the switch K7 and the switch K13 are disconnected, and at the moment, the low-voltage direct current output by the storage battery passes through a filter capacitor C5 and then is rectified by a full-bridge circuit consisting of a switch Q11 and a switch Q14, after being converted by a transformer T1, an inductor L2 and a capacitor C2, a bridge rectifier circuit consisting of a switch Q3 and a switch Q6 rectifies the voltage and outputs the rectified voltage to a capacitor C1, the rectified voltage is filtered by a capacitor C1, after the three-phase motor driving bridge of the bridge arm inverter 12 and the circuit composed of the switch Q1 and the switch Q2 are converted into direct current, after being filtered by a three-phase winding of the motor coil 11 and the inductor L1, the direct current is output through the direct current charging port 101 for use outside the vehicle, so as to realize a direct current external emergency discharge mode of the energy conversion device.

Or, as shown in fig. 7, when the circuit 100 operates in the dc-to-external emergency discharging mode, the switch K1, the switch K2, and the switch K12 are closed, and the switch K3, the switch K4, and the switches K7 to K13 are opened, at this time, the low-voltage dc output by the battery is rectified by a full-bridge circuit composed of switches Q11 to Q14 after passing through the filter capacitor C5, then rectified by a full-bridge circuit composed of switches Q11 to Q14 after passing through the transformer T1, the inductor L2, and the capacitor C2, rectified by a bridge rectifier circuit composed of switches Q3 to Q6, and then output to the capacitor C1 after being filtered by the capacitor C1, converted into dc by a circuit composed of a three-phase motor driving bridge of the bridge arm converter 120, the switch Q1, and the switch Q2, filtered by a three-phase winding of the motor coil 11, and then output the dc for external use through the dc charging port 101.

In this embodiment, when the battery 200 fails and is unavailable, the energy conversion device provided by the present application controls on/off of each switch, so that the low-voltage direct current output by the storage battery is provided with a direct current to the outside through the direct current charging port 101 under the action of the bidirectional DC module 15, the bridge arm converter 12, the motor coil 11, and the like, thereby realizing emergency discharge of the direct current of the energy conversion device to the outside.

Further, as shown in fig. 8, when the energy conversion device operates in the emergency driving mode, a switch K12 in the energy conversion device is closed, all the other switches are opened, at this time, the low-voltage direct current output by the storage battery is rectified by a full-bridge circuit composed of switches Q11 to Q14 after passing through a filter capacitor C5, then is converted by a transformer T1, an inductor L2 and a capacitor C2, is rectified by a bridge rectifier circuit composed of switches Q3 to Q6, and then is output to a capacitor C1, and is filtered by a capacitor C1, and then outputs three-phase alternating current to a three-phase winding of the motor coil 11 through a three-phase motor driving bridge of the bridge arm converter 12, so as to drive the motor.

In this embodiment, when the battery 200 fails and is unavailable and needs to drive the motor, the energy conversion device provided by the present application controls the on/off of the switching element K1 to the switching element K11, so that the low-voltage direct current output by the storage battery drives the motor behind the bidirectional DC module 15 and the bridge arm converter 12, thereby implementing emergency driving of the energy conversion device and further ensuring normal operation of the vehicle.

It should be noted that, the present application mainly uses the circuits shown in fig. 7 and fig. 8 as an example to describe the specific operation mode of the circuit 100 with integrated driving and charging functions and the specific operation principle of the circuit 100 in each mode, and when the implementation structure of the circuit 100 is the circuit shown in fig. 9, the operation principle and operation process of the first DC/DC conversion unit in the circuit 100 are the same as those of the first converter 151, the second converter 152 and the voltage transformation unit 154 in the bidirectional DC module 15 in fig. 7 or fig. 8, and the operation principle and operation process of the second DC/DC conversion circuit are the same as those of the first converter 151 and the third converter 153 in fig. 7 or fig. 8, so the operation principle of the first DC/DC conversion unit and the second DC/DC conversion unit can refer to the operation principle of the bidirectional DC module 15 shown in fig. 7 or fig. 8, and will not be described in detail herein.

Further, as shown in fig. 11, the present application also proposes a power system, which includes an energy conversion device and a control module (not shown in the figure). Wherein, energy conversion device includes:

a motor 301 including a motor coil 11;

the motor control module 302 comprises a bridge arm converter 12, wherein the bridge arm converter 12 is connected with one end of the motor coil 11, and the other end of the motor coil 11 is connected with the external charging port 10; and the number of the first and second groups,

the vehicle-mounted charging module 303 comprises a bidirectional bridge arm 13, wherein the bidirectional bridge arm 13 is connected with a bridge arm converter 12 in parallel to form a first connection end and a second connection end, the first connection end is connected with one end of an external power battery 200, the second connection end is connected with the other end of the external power battery 200, and an external charging port 10 is connected with the second connection end and the midpoint of the bidirectional bridge arm 13;

a bidirectional DC module 15, the bidirectional DC module 15 being connected in parallel to the bridge arm converter 12 and the bidirectional bridge arm 13, and being connected to the external power battery 200 and the external storage battery 300;

the control module is used for controlling a direct current charging circuit formed by the external charging port 10, the motor coil 11, the bridge arm converter 12 and the external power battery 200, or is used for controlling a direct current charging circuit formed by the external charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15 and the external power battery 200; the control circuit is used for controlling an alternating current charging circuit formed by the external charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13 and the external power battery 200, or is used for controlling the alternating current charging circuit formed by the external charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13, the bidirectional DC module 15 and the external power battery 200; and a motor driving circuit for controlling the formation of the external power battery 200, the bridge arm inverter 12, and the motor coil 11; and for controlling the external accumulator 300, the bidirectional DC module 15, the arm converter 12 and the motor coil 11 to form an emergency drive.

Further, as an embodiment of the present application, as shown in fig. 12, the energy conversion apparatus further includes a switch module 14, one end of the switch module 14 is connected to the external charging port 10, and the other end of the switch module 14 is respectively connected to one end of the motor coil 11, the bridge arm converter 12, and the bidirectional bridge arm 13, and the control module controls the switch module 14 to realize switching among the dc charging mode, the ac charging mode, the driving mode, and the emergency driving mode;

in the direct current charging mode, the external charging port 10, the motor coil 11, the bridge arm converter 12 and the external power battery 200 form a direct current charging circuit, or the external charging port 10, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15 and the external power battery 200 form a direct current charging circuit;

in the ac charging mode, the external charging port 10, the motor coil 11, the arm converter 12, the bidirectional arm 13, and the external power battery 200 form an ac charging circuit, or the external charging port 10, the motor coil 11, the arm converter 12, the bidirectional arm 13, the bidirectional DC module 15, and the external power battery 200 form an ac charging circuit;

in the driving mode, the external power battery 200, the bridge arm inverter 12 and the motor coil 11 form a motor driving circuit;

in the emergency driving mode, the external storage battery 300, the bidirectional DC module 15, the arm converter 12, and the motor coil 11 form an emergency driving circuit.

It should be noted that, in this embodiment, the specific structure of the switch module 14 and the connection relationship between the switch module and other modules in the energy conversion device are the same as those of the switch module in the energy conversion device shown in fig. 7, so as to refer to the relevant structure and operation principle of the switch module 14 in this embodiment, which are described with reference to fig. 7, and are not repeated herein.

Further, as an embodiment of the present application, the energy conversion device further includes a switch module and an inductor, one end of the switch module is connected to the external charging port, the other end of the switch module is respectively connected to one end of the inductor, the bridge arm converter and the bidirectional bridge arm, and the other end of the inductor is connected to the motor coil; the control module controls the switch module to realize the switching of a direct current charging mode, an alternating current charging mode, a driving mode and an emergency driving mode;

in the direct current charging mode, the external charging port, the inductor, the motor coil, the bridge arm converter and the external power battery form a direct current charging circuit, or the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct current charging circuit;

in an alternating current charging mode, an alternating current charging circuit is formed by the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm and the external power battery, or the alternating current charging circuit is formed by the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery;

in the emergency driving mode, the external storage battery, the bidirectional DC module, the bridge arm converter and the motor coil form an emergency driving circuit.

It should be noted that, in this embodiment, the specific structures of the switch module and the inductor and the connection relationship between the switch module and the inductor and other modules in the energy conversion device are all the same as those of the switch module and the inductor in the energy conversion device shown in fig. 7, so as to refer to the relevant structures and working principles of the switch module and the inductor in this embodiment, which are not described herein again.

Further, as an embodiment of the present application, as shown in fig. 13, a motor control module 302 and an on-board charging module 303 are integrated in a first box 500; it should be noted that, in other embodiments of the present application, the motor control module 302 and the vehicle-mounted charging module 303 may also be separately disposed in two cases, which is not limited herein.

In this embodiment, the motor control module 302 and the vehicle-mounted charging module 303 are integrated in an integrated box, so that the overall structure of the power system is more compact, the size of the power system is further reduced, and the weight of a vehicle using the power system is reduced.

Further, as an embodiment of the present application, as shown in fig. 13, the power system further includes a reducer 303, the reducer 303 is power-coupled with the motor 301 (not shown, please refer to fig. 11), and the reducer 303 and the motor 301 are integrated in a second casing.

Further, as an embodiment of the present application, the first box is fixedly connected to the second box.

In specific implementation, the first box and the second box may be connected by any connecting member with a fixing function, or the first box is provided with a fixing member capable of being connected with the second box, or the second box is provided with a fixing member capable of being connected with the first box, which is not limited herein.

In this embodiment, the first box and the second box are fixed, so that the first box and the second box can be effectively prevented from being separated, and therefore, the motor control module 302, the vehicle-mounted charging module 303, the motor 301 and the speed reducer 303 are guaranteed not to be broken down due to the falling of the boxes, and the working reliability and the stability of the power system are improved.

Further, as an embodiment of the present application, as shown in fig. 13, the power system further includes a capacitor (not shown), the capacitor is connected in parallel with the motor control module 302, and the capacitor is integrated in the first box.

It should be noted that, in this embodiment, the specific structure and the operation principle of the energy conversion device may refer to the energy conversion device shown in fig. 1 to 9, and therefore, the description about the specific operation principle of the energy conversion device may refer to the detailed description of fig. 1 to 9, and is not repeated herein.

Further, as shown in fig. 14, the present application also provides an energy conversion apparatus including:

a charging connection terminal group 16 including a first charging connection terminal 161, a second charging connection terminal 162, and a third charging connection terminal 163;

a motor coil 11 having one end connected to the first charging connection terminal 161;

the bridge arm converter 12 is connected to the other end of the motor coil 11 and the second charging connection end 162;

a bidirectional bridge arm 13 connected in parallel with the bridge arm converter 12, the bidirectional bridge arm 13 being connected 163 to the third charging connection end;

a bidirectional DC module 15 connected in parallel 13 with the bidirectional bridge arm;

a first energy storage link group 17 including a first energy storage link 171 and a second energy storage link 172, the first energy storage link 171 being connected to one end of the bidirectional DC module 15, the second energy storage link 172 being connected to the other end of the bidirectional DC module 15;

and a second set of energy storage connections 18 comprising a third energy storage connection 181 and a fourth energy storage connection 182, the third energy storage connection 181 being connected to one end of the bi-directional DC module 15 and the fourth energy storage connection 182 being connected to the other end of the bi-directional DC module 15.

Further, as an embodiment of the present application, the charging connection terminal set 16, the first energy storage connection terminal set 17, and the second energy storage connection terminal set 18 adopt one of a connection line, a connector, or a connection interface.

Further, as an embodiment of the present application, as shown in fig. 15, the motor coil includes three-phase windings, each phase winding includes N coil branches, first ends of the N coil branches in each phase winding are connected to the bridge arm converter after being connected in common, second ends of the N coil branches in each phase winding are connected to second ends of the N coil branches in the other two-phase windings in a one-to-one correspondence manner, so as to form N neutral points, and the external charging port is connected to the M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.

Further, as an embodiment of the present application, as shown in fig. 17, the bridge arm converter 1 includes a first phase bridge arm, a second phase bridge arm, and a third phase bridge arm connected in parallel;

the second phase bridge arm comprises a third power switch unit 3 and a fourth power switch unit 4 which are connected in series, and the middle points of the third power switch unit 3 and the fourth power switch unit 4 are connected with a second phase coil of the motor coil;

the second end of the second power switch unit 2, the second end of the fourth power switch unit 4 and the second end of the sixth power switch unit 6 are connected in common to form a negative end of the bridge arm converter 12, and the negative end of the bridge arm converter 12 is connected with the charging connection end group 16 and the negative end of the bidirectional bridge arm 13 respectively.

Further, as an embodiment of the present application, as shown in fig. 17, bidirectional arm 13 includes:

and the fourth phase bridge arm comprises a seventh power switch unit Q1 and an eighth power switch unit Q2 which are connected in series, one end of the fourth phase bridge arm after series connection is connected with the positive end of the bridge arm converter 12, the other end of the fourth phase bridge arm after series connection is connected with the negative end of the bridge arm converter 12, and the middle points of the seventh power switch unit Q1 and the eighth power switch unit Q2 are connected with the charging connection end group 16.

Further, as an embodiment of the present invention, as shown in fig. 16, the bidirectional DC module 15 includes a first converter 151, a second converter 152, a third converter 153, and a voltage transformation unit 154, a primary side, a first secondary side, and a second secondary side of the voltage transformation unit 154 are respectively connected to the first converter 151, the second converter 152, and the third converter 153, the first converter 151 is connected in parallel to the bidirectional arm 13, the second converter 152 is connected to the first energy storage connection terminal group 17, and the third converter 153 is connected to the second energy storage connection terminal group 18.

Further, as an embodiment of the present application, the charging connection terminal group 16, the motor coil 11, the arm converter 12, and the external power battery 200 form a DC charging circuit, or the charging connection terminal group 16, the motor coil 11, the arm converter 12, the bidirectional DC module 15, and the external power battery 200 form a DC charging circuit;

the charging connection end group 16, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13 and the external power battery 200 form an alternating current charging circuit, or the charging connection end group 16, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13, the bidirectional DC module 15 and the external power battery 200 form an alternating current charging circuit;

the first energy storage connecting end group 17, the bridge arm converter 12 and the motor coil 11 form a motor driving circuit;

the second energy storage connection terminal group 18, the bidirectional DC module 15, the bridge arm converter 12 and the motor coil 11 form an emergency driving circuit.

As an embodiment of the present invention, as shown in fig. 16, the energy conversion device further includes a switch module 14 having one end connected to the first charging connection terminal 161, the second charging connection terminal 162, and the third charging connection terminal 163, and the other end connected to the motor coil 11, the bridge arm converter 12, and the bidirectional bridge arm 13, respectively.

Further, as an embodiment of the present application, as shown in fig. 17, the present application further includes an inductor L1, one end of the inductor L1 is connected to the charging connection terminal group 16, and the other end is connected to the motor coil 11;

the charging connection end group 16, the inductor L1, the motor coil 11, the bridge arm converter 12 and the external power battery 200 form a direct current charging circuit, or the charging connection end group 16, the inductor L1, the motor coil 11, the bridge arm converter 12, the bidirectional DC module 15 and the external power battery 200 form a direct current charging circuit;

the charging connection end group 16, the inductor L1, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13 and the external power battery 200 form an alternating current charging circuit, or the charging connection end group 16, the inductor L1, the motor coil 11, the bridge arm converter 12, the bidirectional bridge arm 13, the bidirectional DC module 15 and the external power battery 200 form an alternating current charging circuit;

Further, the present application provides a power system that includes an energy conversion device and a control module. Wherein, energy conversion device includes:

the vehicle-mounted charging module comprises a bidirectional bridge arm and a charging connecting end group, the charging connecting end group comprises a first charging connecting end, a second charging connecting end and a third charging connecting end, the bidirectional bridge arm is connected with the third charging connecting end,

the motor comprises a motor coil, and one end of the motor coil is connected with the first charging connecting end;

the motor control module comprises a bridge arm converter which is respectively connected with the other end of the motor coil and the second charging connecting end and is connected with the bidirectional bridge arm in parallel;

a bidirectional DC module connected in parallel with the bidirectional bridge arm;

the first energy storage connecting end group comprises a first energy storage connecting end and a second energy storage connecting end, the first energy storage connecting end is connected with one end of the bidirectional DC module, and the second energy storage connecting end is connected with the other end of the bidirectional DC module;

the second energy storage connecting end group comprises a third energy storage connecting end and a fourth energy storage connecting end, the third energy storage connecting end is connected with one end of the bidirectional DC module, and the fourth energy storage connecting end is connected with the other end of the bidirectional DC module;

the control module is used for forming a direct current charging circuit by the charging connection end group, the motor coil, the bridge arm converter and the external power battery, or forming a direct current charging circuit by the charging connection end group, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery; the control circuit is used for controlling the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm and the external power battery to form an alternating current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery to form an alternating current charging circuit, controlling the first energy storage connection end group, the bridge arm converter and the motor coil to form a motor driving circuit, and controlling the second energy storage connection end group, the bidirectional DC module, the bridge arm converter and the motor coil to form an emergency driving circuit.

Further, as an embodiment of the present application, the energy conversion device further includes a switch module, one end of which is connected to the charging connection terminal set, and the other end of which is connected to the motor coil, the bridge arm converter, and the bidirectional bridge arm, respectively;

the control module controls the switch module to realize the switching of a direct current charging mode, an alternating current charging mode, a driving mode and an emergency driving mode;

in the direct current charging mode, the charging connection end group, the motor coil, the bridge arm converter and the external power battery form a direct current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct current charging circuit;

in an alternating current charging mode, the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm and the external power battery form an alternating current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit;

in a driving mode, the first energy storage connecting end group, the bridge arm converter and the motor coil form a motor driving circuit;

and under the emergency driving mode, the second energy storage connecting end group, the bidirectional DC module, the bridge arm converter and the motor coil form an emergency driving circuit.

Further, as an embodiment of the present application, the energy conversion device further includes a switch module and an inductor, one end of the switch module is connected to the charging connection end set, the other end of the switch module is respectively connected to one end of the inductor, the bridge arm converter and the bidirectional bridge arm, and the other end of the inductor is connected to the motor coil;

in a direct current charging mode, a charging connection end group, an inductor, a motor coil, a bridge arm converter and an external power battery form a direct current charging circuit, or the charging connection end group, the inductor, the motor coil, the bridge arm converter, a bidirectional DC module and the external power battery form a direct current charging circuit;

in an alternating current charging mode, the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm and the external power battery form an alternating current charging circuit, or the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit;

Further, as an embodiment of the present application, the motor control module, the vehicle-mounted charging module, the bidirectional DC module, and the control module are integrated in the first housing.

Further, as an embodiment of the present application, the power system should include a speed reducer, the speed reducer is dynamically coupled with the motor, and the speed reducer and the motor are integrated in the second box.

It should be noted that, in this embodiment, the structure of the power system provided in the present application may refer to the power system shown in fig. 11 to 13, and the energy conversion device included in the power system is the same as the energy conversion device shown in fig. 14 to 17, and specifically, the description related to fig. 14 to 17 may be referred to, and details are not repeated herein.

Further, the present application also provides a vehicle that includes a powertrain. It should be noted that, since the powertrain included in the vehicle provided by the embodiment of the present application is the same as the powertrain described above, reference may be made to the foregoing related description for specific operating principles of the powertrain in the vehicle provided by the embodiment of the present application, and details are not described herein again.

In the application, the vehicle provided by the application adopts the energy conversion device which comprises the motor coil, the bridge arm converter, the bidirectional bridge arm and the bidirectional DC module and integrates the driving and charging functions, so that the energy conversion device can work in a driving mode, a direct current charging mode, an alternating current charging mode and an emergency driving mode, further the motor driving, battery charging and vehicle emergency of the vehicle are realized by adopting the same system, especially the direct current charging and alternating current charging can be realized by adopting the same circuit topology, the multiplexing degree of components is high, the system integration level is high, the structure is simple, the system cost is reduced, the system volume is reduced, and the problems that the overall circuit structure of a motor driving and charging system in the prior art is complex, the integration level is low, the size is large, the cost is high and the emergency requirement of the vehicle cannot be completed are solved.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and scope of the present application should be included in the present application.

Claims

1. An energy conversion device is characterized by comprising a motor coil, a bridge arm converter, a bidirectional bridge arm and a bidirectional DC module;

the external charging port, the motor coil, the bridge arm converter and the external power battery form a direct current charging circuit, or the external charging port, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct current charging circuit so as to charge the external power battery;

the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm and an external power battery form an alternating current charging circuit, or the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit so as to charge the external power battery;

2. The energy conversion device of claim 1, wherein the motor coils comprise three-phase windings, each phase winding comprises N coil branches, first ends of the N coil branches in each phase winding are connected with the bridge arm converter after being connected in common, second ends of the N coil branches in each phase winding are connected with second ends of the N coil branches in the other two-phase windings in a one-to-one correspondence manner to form N neutral points, and the external charging port is connected with the M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.

3. The energy conversion device of claim 2, wherein the value of N is 4.

4. The energy conversion device of claim 3, further comprising a neutral switch for controlling M of the N neutral points of the motor coil to be connected to the external charging port.

5. The energy conversion device of claim 1, further comprising a switch module,

one end of the bidirectional bridge arm is connected with the external charging port, and the other end of the bidirectional bridge arm is connected with the motor coil, the bridge arm converter and the bidirectional bridge arm respectively.

6. The energy conversion device of claim 5, wherein the external charging port comprises a direct current charging port and an alternating current charging port; the switch module comprises a first switch unit and a second switch unit;

the direct-current charging port, the first switch unit, the motor coil, the bridge arm converter and the external power battery form a direct-current charging circuit, or the direct-current charging port, the first switch unit, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct-current charging circuit;

the ac charging port, the second switch unit, the motor coil, the bridge arm converter, the bidirectional bridge arm, and the external power battery form an ac charging circuit, or the ac charging port, the second switch unit, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module, and the external power battery form an ac charging circuit.

7. The energy conversion device according to claim 6, wherein the first switching unit includes a first switch and a second switch, and the second switching unit includes a third switch and a fourth switch;

one end of the first switch is connected with the direct current charging port, and the other end of the first switch is connected with the motor coil; one end of the second switch is connected with the direct current charging port, and the other end of the second switch is connected with the bridge arm converter;

one end of the third switch is connected with the alternating current charging port, the other end of the third switch is connected with the motor coil, one end of the fourth switch is connected with the alternating current charging port, and the other end of the fourth switch is connected with the bidirectional bridge arm.

8. The energy conversion device of claim 5, wherein the external charging port comprises a AC/DC charging port, the switching module comprises a third switching unit, a fourth switching unit,

one end of the third switch unit is connected with the alternating current/direct current charging port, the other end of the third switch unit is connected with the motor coil, one end of the fourth switch unit is connected with the alternating current/direct current charging port, and the other end of the fourth switch unit is connected with the bridge arm converter or the bidirectional bridge arm;

when the fourth switch unit is connected with the bridge arm converter, the alternating current/direct current charging port, the third switch unit, the fourth switch unit, the motor coil, the bridge arm converter and the external power battery form a direct current charging circuit, or the alternating current/direct current charging port, the third switch unit, the fourth switch unit, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct current charging circuit;

when the fourth switch unit is connected with the bidirectional bridge arm, the alternating current/direct current charging port, the third switch unit, the fourth switch unit, the motor coil, the bridge arm converter, the bidirectional bridge arm and the external power battery form an alternating current charging circuit, or the alternating current/direct current charging port, the third switch unit, the fourth switch unit, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit.

9. The energy conversion device according to claim 8, wherein the third switching unit includes a fifth switch, one end of which is connected to the ac/dc charging port and the other end of which is connected to the motor coil;

the fourth switch unit comprises a single-pole double-throw switch, the single-pole double-throw switch comprises a movable end and two immovable ends, the movable end is connected with the alternating current and direct current charging port, one immovable end is connected with the bridge arm converter, and the other immovable end is connected with the bidirectional bridge arm;

or the fourth switch unit comprises two switches, one end of one switch is connected with the alternating current/direct current charging port, and the other end of the switch is connected with the bridge arm converter; one end of the other switch is connected with the alternating current/direct current charging port, and the other end of the other switch is connected with the bidirectional bridge arm.

10. The energy conversion device according to any one of claims 1 to 9, further comprising a first capacitor connected in parallel with the bidirectional leg.

11. The energy conversion device of claim 5, wherein the switch module further comprises a fifth switch unit, one end of the fifth switch unit is connected with the external power battery, and the other end of the fifth switch unit is connected between the bidirectional bridge arm and the bidirectional DC module.

12. The energy conversion device of claim 11, wherein the switch module further comprises a sixth switch unit, one end of the sixth switch unit is connected with the bidirectional DC module, and the other end is connected with the external power battery.

13. The energy conversion device of claim 1, wherein the bi-directional DC module is further connected to an onboard electrical discharge port.

14. The energy conversion device according to claim 13, wherein the bidirectional DC module includes a first converter, a second converter, a third converter, and a transformation unit, a primary side, a first secondary side, and a second secondary side of the transformation unit are respectively connected to the first converter, the second converter, and the third converter, the first converter is connected in parallel to the bidirectional bridge arm, the second converter is connected to the external power battery, and the third converter is connected in parallel to the external storage battery and/or the vehicle-mounted discharge port.

15. The energy conversion arrangement according to claim 14, wherein the third converter comprises a first sub-converter and a second sub-converter, both connected to the second secondary side of the voltage transformation unit.

16. The energy conversion device of claim 1, wherein the leg converter comprises a first phase leg, a second phase leg, and a third phase leg connected in parallel;

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

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

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

the first end of the first power switch unit, the first end of the third power switch unit and the first end of the fifth power switch unit are connected in common to form a positive end of the bridge arm converter, and the positive end of the bridge arm converter is connected with the positive end of the bidirectional bridge arm;

and the second end of the second power switch unit, the second end of the fourth power switch unit and the second end of the sixth power switch unit are connected together to form a negative end of the bridge arm converter, and the negative end of the bridge arm converter is connected with the negative end of the bidirectional bridge arm.

17. The energy conversion device of claim 1, wherein the bidirectional leg comprises:

and the fourth phase bridge arm comprises a seventh power switch unit and an eighth power switch unit which are connected in series, one end of the fourth phase bridge arm after series connection is connected with the positive end of the bridge arm converter, the other end of the fourth phase bridge arm after series connection is connected with the negative end of the bridge arm converter, and the midpoint of the seventh power switch unit and the midpoint of the eighth power switch unit are connected with the external charging port.

18. The energy conversion device of claim 1, further comprising an inductor, one end of the inductor being connected to the external charging port and the other end of the inductor being connected to the motor coil;

the external charging port, the inductor, the motor coil, the bridge arm converter and the external power battery form a direct current charging circuit, or the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct current charging circuit;

the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm, and the external power battery form an alternating current charging circuit, or the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module, and the external power battery form an alternating current charging circuit.

19. A power system comprising the energy conversion device of any one of claims 1-18 and a control module, wherein the energy conversion device comprises:

a motor including a motor coil;

the vehicle-mounted charging module comprises a bidirectional bridge arm, the bidirectional bridge arm is connected with the bridge arm converter in parallel to form a first connection end and a second connection end, the first connection end is connected with one end of an external power battery, the second connection end is connected with the other end of the external power battery, and the external charging port is connected with the second connection end and the midpoint of the bidirectional bridge arm;

the control module is used for controlling a direct current charging circuit formed by an external charging port, the motor coil, the bridge arm converter and an external power battery, or is used for controlling the direct current charging circuit formed by the external charging port, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery; the alternating current charging circuit is used for controlling an external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm and an external power battery to form, or the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form the alternating current charging circuit; the motor driving circuit is used for controlling the external power battery, the bridge arm converter and the motor coil to form; and the emergency driving circuit is used for controlling the external storage battery, the bidirectional DC module, the bridge arm converter and the motor coil to form an emergency driving circuit.

20. The power system of claim 19, wherein the energy conversion device further comprises a switch module, one end of the switch module is connected to the external charging port, and the other end of the switch module is connected to one end of the motor coil, the bridge arm converter and the bidirectional bridge arm respectively, and the control module controls the switch module to switch the direct-current charging mode, the alternating-current charging mode, the driving mode and the emergency driving mode;

in the direct-current charging mode, the external charging port, the motor coil, the bridge arm converter and an external power battery form a direct-current charging circuit, or the external charging port, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct-current charging circuit;

in the alternating current charging mode, the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm and an external power battery form an alternating current charging circuit, or the external charging port, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit;

in the driving mode, the external power battery, the bridge arm converter and the motor coil form a motor driving circuit;

in the emergency driving mode, the external storage battery, the bidirectional DC module, the bridge arm converter, and the motor coil form an emergency driving circuit.

21. The powertrain system of claim 20, wherein the energy conversion device further comprises a switch module and an inductor, one end of the switch module is connected to the external charging port, the other end of the switch module is connected to one end of the inductor, the bridge arm converter and the bidirectional bridge arm, respectively, and the other end of the inductor is connected to the motor coil; the control module controls the switch module to realize the switching of a direct current charging mode, an alternating current charging mode, a driving mode and an emergency driving mode;

in the direct-current charging mode, the external charging port, the inductor, the motor coil, the bridge arm converter and the external power battery form a direct-current charging circuit, or the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional DC module and the external power battery form a direct-current charging circuit;

in the alternating current charging mode, the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm and the external power battery form an alternating current charging circuit, or the external charging port, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the external power battery form an alternating current charging circuit;

22. The powertrain system of claim 19, wherein the motor control module, the on-board charging module, the bi-directional DC module, and the control module are integrated in a first housing.

23. The power system of claim 22, further comprising a speed reducer, wherein the speed reducer is in power coupling with the motor, and the speed reducer and the motor are integrated in a second housing.

24. The power system of claim 22, wherein a capacitor of the energy conversion device is connected in parallel with the motor control module, the capacitor being integrated in the first tank.

25. The power system of claim 23, wherein the first case is fixedly coupled to the second case.

26. An energy conversion device, comprising:

one end of the motor coil is connected with the first charging connecting end;

a bidirectional DC module connected in parallel with the bidirectional leg;

the first energy storage connecting end group comprises a first energy storage connecting end and a second energy storage connecting end, the first energy storage connecting end is respectively connected with one end of the bidirectional DC module and the bridge arm converter, and the second energy storage connecting end is connected with the other end of the bidirectional DC module and the bridge arm converter;

27. The energy conversion device of claim 26, wherein the set of charging connections, the set of first energy storage connections, and the set of second energy storage connections employ one of a connecting wire, a connector, or a connecting interface.

28. The energy conversion device of claim 26, wherein the motor coils comprise three-phase windings, each phase winding comprises N coil branches, first ends of the N coil branches in each phase winding are connected with the bridge arm converter after being connected in common, second ends of the N coil branches in each phase winding are connected with second ends of the N coil branches in the other two-phase windings in a one-to-one correspondence manner to form N neutral points, and the external charging port is connected with the M neutral points; wherein N is an integer greater than 1, and M is a positive integer less than N.

29. The energy conversion device of claim 26, wherein the leg converter comprises a first phase leg, a second phase leg, and a third phase leg connected in parallel;

the second end of the second power switch unit, the second end of the fourth power switch unit and the second end of the sixth power switch unit are connected together to form a negative end of the bridge arm converter, and the negative end of the bridge arm converter is connected with the charging connection end group and the negative end of the bidirectional bridge arm respectively.

30. The energy conversion device of claim 26, wherein the bidirectional leg comprises:

and the fourth phase bridge arm comprises a seventh power switch unit and an eighth power switch unit which are connected in series, one end of the fourth phase bridge arm after series connection is connected with the positive end of the bridge arm converter, the other end of the fourth phase bridge arm after series connection is connected with the negative end of the bridge arm converter, and the midpoint of the seventh power switch unit and the midpoint of the eighth power switch unit are connected with the charging connection end group.

31. The energy conversion device of claim 26, wherein the bidirectional DC module comprises a first converter, a second converter, a third converter, and a transformation unit, wherein a primary side, a first secondary side, and a second secondary side of the transformation unit are connected to the first converter, the second converter, and the third converter, respectively, the first converter is connected in parallel to the bidirectional leg, the second converter is connected to the first energy storage connection terminal set, and the third converter is connected to the second energy storage connection terminal set.

32. The energy conversion device of claim 26,

the charging connection end group, the motor coil, the bridge arm converter and the first energy storage connection end group form a direct current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional DC module and the first energy storage connection end group form a direct current charging circuit;

the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm and the first energy storage connection end group form an alternating current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the first energy storage connection end group form an alternating current charging circuit;

the first energy storage connecting end group, the bridge arm converter and the motor coil form a motor driving circuit;

the second energy storage connection end group, the bidirectional DC module, the bridge arm converter and the motor coil form an emergency driving circuit.

33. The energy conversion device according to claim 26, further comprising a switch module having one end connected to the first charging connection terminal, the second charging connection terminal, and the third charging connection terminal, and the other end connected to the motor coil, the bridge arm converter, and the bidirectional bridge arm.

34. The energy conversion device of claim 26, further comprising an inductor, one end of the inductor being connected to the set of charging connections and the other end of the inductor being connected to the motor coil;

the charging connection end group, the inductor, the motor coil, the bridge arm converter and the first energy storage connection end group form a direct current charging circuit, or the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional DC module and the first energy storage connection end group form a direct current charging circuit;

the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm and the first energy storage connection end group form an alternating current charging circuit, or the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the first energy storage connection end group form an alternating current charging circuit;

35. A power system comprising the energy conversion device of any one of claims 26 to 34 and a control module, wherein the energy conversion device comprises:

a bidirectional DC module connected with the bidirectional bridge arm;

a second energy storage connection terminal set including a third energy storage connection terminal and a fourth energy storage connection terminal, the third energy storage connection terminal being connected with one end of the bidirectional DC module, the fourth energy storage connection terminal being connected with the other end of the bidirectional DC module;

the control module is used for the charging connection end group, the motor coil, the bridge arm converter and the first energy storage connection end group to form a direct current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional DC module and the first energy storage connection end group to form a direct current charging circuit; the control circuit is used for controlling the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm and the first energy storage connection end group to form an alternating current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the first energy storage connection end group to form an alternating current charging circuit, controlling the first energy storage connection end group, the bridge arm converter and the motor coil to form a motor driving circuit, and controlling the second energy storage connection end group, the bidirectional DC module, the bridge arm converter and the motor coil to form an emergency driving circuit.

36. The power system of claim 35, wherein the energy conversion device further comprises a switch module, one end of which is connected to the first charging connection end, and the other end of which is connected to the motor coil, the bridge arm converter and the bidirectional bridge arm, respectively;

in the direct-current charging mode, the charging connection end group, the motor coil, the bridge arm converter and the first energy storage connection end group form a direct-current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional DC module and the first energy storage connection end group form a direct-current charging circuit;

in the alternating-current charging mode, the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm and the first energy storage connection end group form an alternating-current charging circuit, or the charging connection end group, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the first energy storage connection end group form an alternating-current charging circuit;

in the driving mode, the first energy storage connecting end group, the bridge arm converter and the motor coil form a motor driving circuit;

in the emergency driving mode, the second energy storage connection end group, the bidirectional DC module, the bridge arm converter, and the motor coil form an emergency driving circuit.

37. The power system of claim 35, wherein the energy conversion device further comprises a switch module and an inductor, one end of the switch module is connected to the charging connection terminal set, the other end of the switch module is connected to one end of the inductor, the bridge arm converter and the bidirectional bridge arm, and the other end of the inductor is connected to the motor coil; (ii) a

in the direct-current charging mode, the charging connection end group, the inductor, the motor coil, the bridge arm converter and the first energy storage connection end group form a direct-current charging circuit, or the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional DC module and the first energy storage connection end group form a direct-current charging circuit;

in the alternating-current charging mode, the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm and the first energy storage connection end group form an alternating-current charging circuit, or the charging connection end group, the inductor, the motor coil, the bridge arm converter, the bidirectional bridge arm, the bidirectional DC module and the first energy storage connection end group form an alternating-current charging circuit;

38. The powertrain system of claim 35, wherein the motor control module, the on-board charging module, the bi-directional DC module, and the control module are integrated in a first housing.

39. The power system of claim 38, further comprising a speed reducer, wherein the speed reducer is in power coupling with the motor, and the speed reducer and the motor are integrated in a second housing.

40. The power system of claim 39, wherein the first case is fixedly coupled to the second case.

41. A vehicle comprising a powertrain as claimed in any one of claims 19 to 25 or comprising a powertrain as claimed in any one of claims 35 to 40.