CN108988655B

CN108988655B - Electric power electronic controller and electric automobile

Info

Publication number: CN108988655B
Application number: CN201710412463.2A
Authority: CN
Inventors: 张超; 王新国; 黄祥飞
Original assignee: NIO Anhui Holding Co Ltd
Current assignee: NIO Holding Co Ltd
Priority date: 2017-06-05
Filing date: 2017-06-05
Publication date: 2022-04-19
Anticipated expiration: 2037-06-05
Also published as: CN108988655A

Abstract

The invention provides an electronic power controller and an electric automobile, and belongs to the technical field of alternating current motor drive control. The power electronic controller of the present invention is for providing ac input to and controlling an ac motor, comprising: the first inversion power module assembly and the second inversion power module assembly are arranged in parallel; and a cooling interlayer sandwiched between the first inverter power module assembly and the second inverter power module assembly; a cooling flow channel shared by the first inversion power module assembly and the second inversion power module assembly is arranged in the cooling interlayer. The power electronic controller has the advantages of large power output and current output capability, good working reliability, better heat dissipation efficiency and compact integral structure.

Description

Electric power electronic controller and electric automobile

Technical Field

The invention belongs to the technical field of alternating current motor drive control, and relates to a Power Electronic Unit (PEU) for providing alternating current input for an alternating current motor and controlling the alternating current motor.

Background

High-power alternating current motors (such as induction motors or permanent magnet synchronous motors) are widely used in the field of electric vehicles and used as driving motors, and with the continuous popularization of electric vehicles, the market places higher requirements on power density, cost, safety and the like of motor driving systems.

In a motor drive system for driving a motor, the rotational speed of the drive motor is controlled and regulated by an electronic power controller PEU, which simultaneously inverts a dc high voltage input from, for example, a power battery into an ac high voltage as a current input to the drive motor. The main functions of the PEU include the following two points:

first, as an energy transmission device between the power battery and the driving motor, it has an inverter function, i.e., a DC-AC conversion function, and for example, it can convert a high-voltage direct current input from the power battery into a three-phase high-voltage alternating current to be transmitted to the driving motor;

secondly, the Control signal interface circuit and the driving motor Control circuit are used for receiving signals sent by a Vehicle Control Unit (VCU) and signals of motor temperature, speed, power and the like, making corresponding feedback, and feeding the signals back to the VCU and the driving motor, thereby playing a role in controlling the driving motor.

At present, a single traditional three-phase full-bridge inversion power module is adopted by an electric power electronic controller, and for a driving motor of an electric automobile with larger power, the driving motor is easily limited by the maximum allowable current of a power device, for example, the peak power of a PEU in the current market does not exceed 200KW, and the peak phase current does not exceed 500A, so the power output of the driving motor is limited; in addition, the type selection and the cost of a single traditional three-phase full-bridge inverter power module are not well controlled, the volume and the cost are difficult to reduce due to excessive power, and the cooling efficiency is low.

Disclosure of Invention

The object of the present invention is to disclose a solution that eliminates or at least alleviates the drawbacks mentioned above that occur in prior art solutions. It is also an object of the invention to achieve one or more of the following advantages:

-increasing the power output and current output capability of the PEU;

-improving the reliability of the PEU;

-increasing the heat dissipation efficiency of the PEU;

-increase the compactness of the PEU.

The present invention provides the following technical solutions.

According to one aspect of the present invention there is provided an electronic power controller for providing an ac input to and controlling an ac motor, comprising:

the first inversion power module assembly and the second inversion power module assembly are arranged in parallel; and

a cooling interlayer interposed between the first inverter power module assembly and the second inverter power module assembly;

the first inversion power module assembly and the second inversion power module assembly are connected to an external high-voltage direct-current power supply in parallel from the same high-voltage direct-current input terminal of the power electronic controller and output alternating current to alternating current output ends of the power electronic controller in parallel;

and a cooling flow channel shared by the first inversion power module assembly and the second inversion power module assembly is arranged in the cooling interlayer.

According to an embodiment of the invention, the power electronic controller is internally provided with a direct current bus bar assembly which is electrically connected with the high voltage direct current input terminal and is used for equally dividing the external high voltage direct current power supply into two direct current inputs; the direct current bus bar assembly is provided with a first direct current bar and a second direct current bar which are arranged in parallel and correspond to the two direct current inputs respectively, and the first inversion power module assembly and the second inversion power module are electrically connected to the first direct current bar and the second direct current bar respectively.

According to an embodiment of the present invention, the dc bus assembly further includes a filter capacitor and a filter inductor.

The power electronic controller according to an embodiment of the present invention, wherein the first inverter power module assembly and the second inverter power module assembly each include:

a capacitor;

a switching power module; and

a drive circuit;

the heat dissipation components respectively arranged on the switching power modules of the first inverter power module assembly and the second inverter power module assembly at least partially extend into the cooling flow channel in an opposite manner.

Optionally, the capacitors of the first inverter power module assembly and the second inverter power module assembly are respectively attached to the upper surface and the lower surface of the cooling interlayer, or are at least partially disposed in the cooling flow channel of the cooling interlayer.

The power electronic controller according to an embodiment of the invention, wherein the first inverter power module assembly includes a first ac output bus interface for configuring the ac output, and the second inverter power module assembly includes a second ac output bus interface for configuring the ac output.

According to an embodiment of the present invention, a switching bus is disposed corresponding to the second ac output bus interface/the first ac output bus interface to form the ac output, wherein a first end of the switching bus is connected to the second ac output bus interface/the first ac output bus interface.

According to an embodiment of the present invention, the height of the transfer bus is equal to the height difference between the first ac output bus interface and the second ac output bus interface, and the second end of the transfer bus and the first ac output bus interface/the second ac output bus interface are linearly arranged on the same height.

According to an embodiment of the present invention, a first switching output bus for forming the ac output is provided corresponding to the first ac output bus interface/the second ac output bus interface, a second switching output bus for forming the ac output is provided corresponding to the second end of the switching bus, and the first switching output bus and the second switching output bus are arranged side by side in a straight line.

According to an embodiment of the present invention, the power electronic controller further includes a filter inductor disposed on the first and second switching output bus bars.

The power electronic controller according to an embodiment of the invention, wherein the first and second inverter power module assemblies each further comprise a current sensor.

The power electronic controller according to an embodiment of the invention, wherein the ac output terminal has three phase lines corresponding to a first three phase ac output of the first inverter power module assembly and three phase lines corresponding to a second three phase ac output of the second inverter power module assembly.

Optionally, the three phase lines corresponding to the first three-phase ac output and the three phase lines corresponding to the second three-phase ac output are electrically connected to the three-phase winding of the three-phase ac motor in a corresponding overlapping manner.

Optionally, when there is a phase difference between the first three-phase ac output and the second three-phase ac output, the three phase lines corresponding to the first three-phase ac output and the three phase lines corresponding to the second three-phase ac output are respectively electrically connected to a six-phase winding of the six-phase ac motor.

The power electronic controller according to an embodiment of the present invention is configured in a substantially box structure, and the first inverter power module assembly, the cooling sandwich, and the second inverter power module assembly are respectively used to form an upper layer, a middle layer, and a lower layer of the box structure.

According to an embodiment of the present invention, the cooling interlayer is configured as a part of a main box of the box structure, and the first inverter power module assembly and the second inverter power module assembly are symmetrically distributed on upper and lower sides of the cooling interlayer.

According to an embodiment of the present invention, the power electronic controller further includes a low voltage control circuit and a shielding plate, wherein the shielding plate is disposed between the low voltage control circuit and the first inverter power module assembly or the second inverter power module assembly for shielding electromagnetic interference of the high voltage current signal.

According to still another aspect of the present invention, there is provided an electric vehicle including an ac motor for outputting power, and the above-mentioned power electronic controller.

The power electronic controller PEU provided by the invention is provided with the first inversion power module assembly and the second inversion power module assembly which are arranged in parallel, and the first inversion power module assembly and the second inversion power module assembly share the cooling flow channel in the cooling interlayer, so that the working reliability of the PEU can be improved while the power output and the current output capability of the PEU are improved, and the PEU has better heat dissipation efficiency and compact integral structure.

Drawings

The above and other objects and advantages of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which like or similar elements are designated by like reference numerals.

Fig. 1 and 2 are schematic external perspective views of a power electronic device according to an embodiment of the present invention.

Fig. 3 is a cross-sectional view of a power electronic device according to an embodiment of the invention.

Fig. 4 is a schematic structural diagram of an internal dc bus assembly and an inverter power module assembly of a power electronic device according to an embodiment of the invention.

Fig. 5 is a schematic diagram of an internal dc bus assembly of a power electronic device according to an embodiment of the invention.

Fig. 6 is a partial structural schematic diagram of an inverter power module assembly of a power electronic device according to an embodiment of the invention.

Fig. 7 is a schematic diagram of an ac output terminal of an inverter power module assembly of a power electronic device according to an embodiment of the present invention.

Fig. 8 is a schematic diagram of the internal structure of a power electronic device according to an embodiment of the present invention, in which a low-voltage control circuit and a shield plate are shown.

Fig. 9 is a schematic view of cooling flow paths inside a power electronic device according to an embodiment of the present invention.

Fig. 10 is a schematic view of the cooling principle of a power electronic device according to an embodiment of the present invention.

Detailed Description

The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the invention to those skilled in the art.

In the following description, for clarity and conciseness of description, not all of the various components shown in the figures have been described in detail. The various components that one of ordinary skill in the art would be fully capable of carrying out the present invention are shown in the figures, the operation of many of which is familiar and obvious to those skilled in the art.

In the following description, for convenience of explanation, a direction of a height of the power electronic controller is defined as a z-direction, a direction of a length of the power electronic controller is defined as an x-direction, and a direction perpendicular to the z-direction and the x-direction, that is, a direction of a width of the power electronic controller is defined as a y-direction. It is to be understood that these directional definitions are for relative description and clarification and may vary accordingly as the orientation of the electronic power controller changes.

In the following embodiments, the directional terms of "upper" and "lower" are defined based on the z direction without specific description; also, it should be understood that these directional terms are relative concepts that are used for descriptive and clarity purposes relative to each other and that may vary accordingly as the orientation in which the stabilization device is installed varies.

The electronic power controller PEU10 according to an embodiment of the present invention is illustrated in detail below with reference to fig. 1 to 10.

The PEU10 is exemplarily applied to an ac motor driving an electric vehicle (including a pure electric vehicle and a hybrid vehicle), and is capable of providing a high-power three-phase high-voltage ac output (U1, V1 and W1, U2, V2 and W2) to the ac motor and providing a large peak power and peak current output.

As shown in fig. 1 and 2, the PEU10 is integrally configured as a generally square box structure 11 having a high voltage dc input terminal 101 on the exterior thereof for accessing a high voltage dc power source, e.g., two high voltage dc input terminals 101 connected to the positive and negative output terminals of a power battery pack, respectively; also, the exterior of the PEU10 has an inlet 301 provided corresponding to the interior cooling flow passage 310, and liquid (e.g., water) for cooling can flow in and out cyclically from the inlet 301. The specific shape design of the external structure of the PEU10 is not limiting, and it may be designed according to factors such as its location for installation on an electric vehicle. In the description that follows, it will be appreciated that the PEU10 with the case structure 11 of the embodiment of the present invention has the advantage of being compact overall.

The interior of the PEU10 is mainly provided with an inverter power module assembly 200 and an inverter power module assembly 400, and the two inverter

power module assemblies

200 and 400 are mainly used for realizing conversion from DC to AC; from the point of view of electrical connection structure, the input ends of the three-phase power module assemblies are simultaneously connected to an external high-voltage direct-current power supply in parallel, and the inverter

power module assemblies

200 and 400 output three-phase alternating currents of U1, V1 and W1 and three-phase alternating currents of U2, V2 and W2 in parallel; from a structural point of view (as shown in fig. 3), the inverter

power module assemblies

200 and 400 may be disposed in parallel with the cooling sandwich 300 interposed therebetween, such that the inverter power module assembly 200, the cooling sandwich 300, and the inverter power module assembly 400 are used to form an upper layer, a middle layer, and a lower layer of the case structure 11, respectively. The corresponding intermediate layer of the cooling sandwich 300 may be a portion of the main case of the case structure 11 formed of, for example, an aluminum alloy, which serves as the main body of the case structure 11, may be integrally formed and used to fix various other components included in the PEU10, which have certain strength and thermal conductivity. A cooling flow passage 310 through which a cooling liquid may circulate may be formed corresponding to the inside of the main case portion interposed between the inverter

power module assemblies

200 and 400, thereby forming a cooling sandwich 300 common to the inverter

power module assemblies

200 and 400, which may cool the inverter

power module assemblies

200 and 400 at the same time, has high cooling efficiency, and may be more compactly arranged in a cooling structure.

In an embodiment, each of the inverter

power module assemblies

200 and 400 has a substantially similar structure as shown in fig. 4 and 6, and they are symmetrically distributed on the upper and lower sides of the cooling interlayer 300, and have

heat dissipation members

221 and 421 for improving heat dissipation efficiency, respectively, and the

heat dissipation members

221 and 421 may be cylinders for easily conducting heat, as shown in fig. 3, 7 and 9, and the heat dissipation member 221 on the inverter power module assembly 200 and the heat dissipation member 421 on the inverter power module assembly 400 are disposed opposite to each other and at least partially extend into the cooling flow channel 310 of the cooling interlayer 300 shared by them, so as to improve heat dissipation efficiency of the inverter power module assembly.

Cooling principle of the PEU10 as shown in fig. 10, the components to be cooled at the core of the inverter power module assembly 200 are high power switching power modules 220, the main heating elements of which are power switching elements (e.g., IGBTs) 222 of the switching power modules 220; likewise, the components of the inverter power module assembly 400 that need to be cooled in particular are high-power switching power modules 420, the main heating elements of which are power switching elements (e.g., IGBTs) 422 of the switching power modules 420. The liquid in the cooling channel 310 circulates in the direction shown in fig. 10, so as to simultaneously take away the heat dissipated by the

power switching elements

222 and 422, and therefore, one cooling interlayer 300 can simultaneously provide heat dissipation for two inverter power module assemblies, thereby improving the heat dissipation efficiency.

As shown in fig. 3 and 4, the inside of the PEU10 is further provided with a dc bus bar assembly 100 electrically connected to the high-voltage dc input terminal 101, and the dc bus bar assembly 100 is used for dividing an external high-voltage dc power source (e.g. the high-voltage dc output of a power battery pack) into two dc inputs, so that the inverter power module assembly 200 and the inverter power module assembly 400 have the same dc input at the same time. The dc bus bar assembly 100 has two parallel dc bars 120 and 140 corresponding to the two dc inputs, respectively, each

dc bar

120 or 140 has two terminals electrically connected to the two dc input terminals 101, i.e. to the positive and negative dc input terminals, respectively; the two first dc bars 120 and the second dc bar 140 are arranged in parallel to realize the shunting of the dc input of the dc bus bar assembly 100. The inversion power module assembly 200 and the inversion power module 400 are electrically connected to the first dc bar 120 and the second dc bar 140, respectively, so that the inversion power module assembly 200 and the inversion power module 400 are respectively connected to an independent dc input power. The first dc row 120 and/or the second dc row 140 may be specifically a dc copper row, and the first dc row 120 and the second dc row 140 have the same structural configuration and use the same material, for example, the first dc row 120 and the second dc row 140 have the same cross-sectional area.

In one embodiment, as shown in fig. 5, the dc bus assembly 100 further includes a filter capacitor 110 and a filter inductor 130. The filter capacitor 110 may be, for example, an X capacitor and a Y capacitor, and may perform filtering processing on the high-voltage dc input to ensure stable and reliable input current; the filter inductor 130 may be an inductor such as a ferrite inductor, which can filter dc high voltage electric noise from the high voltage dc input of the power battery pack, so as to ensure the EMC performance of the PEU 10.

As shown in fig. 3, 4 and 7, the inverter power module assembly 200 mainly includes a capacitor 210, a switching power module 220 and a driving circuit 230; the inverter power module assembly 400 has a similar structure, and mainly includes a capacitor 410, a switching power module 420, and a driving circuit 430.

Capacitors

210 and 410 are optionally thin film capacitors, which may be connected across each DC input, respectively, to form a DC-link capacitor, and thus may also be referred to as DC link capacitors.

Since the

capacitors

210 and 410 may generate heat due to ripple current generated thereon when operating, in an embodiment, the

capacitors

210 and 410 may be attached to the upper surface and the lower surface of the cooling interlayer 300, respectively, or at least a portion of the

capacitors

210 and 410 may be directly disposed in the cooling channel 310, so as to dissipate heat and cool the

capacitors

210 and 410 by using the cooling interlayer 300.

The switching

power modules

220 and 420 generate a large amount of heat during the inverter operation and are cooled by the cooling interlayer 300. The switching

power modules

220 and 420 can work simultaneously to output three-phase alternating current, so that the power output and current output capacity of the PEU10 are improved, and the requirement of high-power output of an alternating current motor in an electric automobile is easily met. In one embodiment, the power rating of the PEU10 may be up to 60KW, peak power may be up to 240KW, and peak current may be up to 930A. Moreover, if one of the switching

power modules

220 and 420 fails or fails, the other switching power module can continue to work and provide a certain power alternating current output, so that the alternating current motor can continue to drive the electric vehicle to run under the condition of relatively low power, the reliability is improved, and the situations of vehicle breakdown and the like can be prevented.

The switching

power modules

220 and 420 may include, for example, three inverter sub-modules to invert to form a 3-phase ac output. It should be noted that, if the switching

power modules

220 and 420 need to output ac outputs other than 3 phases, the number of output phases can be adjusted by setting the number of inverter sub-modules. The

power switching elements

222 and 422 for each inverter sub-module may be, but are not limited to, IGBTs (insulated gate bipolar transistors).

Continuing with fig. 1 and 3, the PEU10 also has ac output terminals 24 having two sets of ac output bus interfaces corresponding to the two inverter power module assemblies, namely, a first ac output bus interface 240 and a second ac output bus interface 440, as shown in fig. 7, the first ac output bus interface 240 is disposed corresponding to the switching power module 220, the second ac output bus interface 440 is disposed corresponding to the switching power module 420, the first ac output bus interface 240 is disposed corresponding to the three-phase ac output terminal of the inverter power module assembly 200 and the three interfaces output U1 phase, V1 phase and W1 phase, respectively, the second ac output bus interface 440 is disposed corresponding to the three-phase ac output terminal of the inverter power module assembly 400 and the three interfaces output U2 phase, V2 phase and W2 phase, respectively.

In one embodiment, as shown in fig. 4 and 7, since the inverter power module assembly 200 and the inverter power module assembly 400 are arranged in parallel in the z-direction, the first ac output bus interface 240 and the second ac output bus interface 440 have a height difference in the z-direction. To overcome this height difference, as shown in fig. 4, 7 and 8, a switching busbar 442 for forming an ac output 24 is provided corresponding to the second ac output busbar interface 440, wherein a first end of the switching busbar 442 is connected to the second ac output busbar interface 440; the height of the transfer bus 442 is substantially equal to the difference in height between the first ac output bus interface 240 and the second ac output bus interface 440, such that the second end of the transfer bus 442 and the first ac output bus interface 240 are linearly arranged at the same height. In this way, the switching bus 442 switches the ac output of the inverter power module assembly 400 to the same height as the ac output of the corresponding inverter power module assembly 200, thereby facilitating the extraction of the two three-phase ac outputs from the PEU 10. It should be understood that, in yet another alternative embodiment, a switching bus may be provided corresponding to the first ac output bus interface 240, wherein a first end of the switching bus is connected to the first ac output bus interface 240, and a second end of the switching bus is arranged at the same height and in a straight line with the second ac output bus interface 440; thus, the transfer bus bar transfers the ac output of the inverter power module assembly 200 to the same height as the ac output of the corresponding inverter power module assembly 400. The adapting busbar 442 may be an adapting copper bar.

As shown in fig. 7 and 8, the first switching output bus bar 250 for forming the ac output end 24 is disposed corresponding to the ac output bus bar interface 240, the second switching output bus bar 450 for forming the ac output end 24 is disposed corresponding to the second end of the switching bus bar 442, and the first switching output bus bar 250 and the second switching output bus bar 450 are disposed side by side in a straight line (for example, in the y direction), so as to facilitate connection of the input end of the ac motor, it should be understood that, in the above embodiment, the ac output end 24 of the PEU10 may be understood as an ac output end assembly mainly including the first ac output bus bar interface 240, the second ac output bus bar interface 440, the switching bus bar 442, the first switching output bus bar 250, and the second switching output bus bar 450. In yet another embodiment, a filtering inductor 245 is disposed in the ac output terminal 24, the filtering inductor 245 may be integrally disposed on the first switching output bus 250 and the second switching output bus 450, and the filtering inductor may integrally filter the first switching output bus 250 and the second switching output bus 450 which are arranged side by side; the filter inductor 245 may also be a straight line with 6 filter inductors arranged side by side, and filter 6 output terminals of the first and second

switching output buses

250 and 450, respectively. The filter inductor 245 ensures the stabilization of the ac output signal. Optionally, the material selected for the filter inductor 245 may be, but is not limited to, ferrite or amorphous material; the filter inductor 245 may be integrated in the main housing, or on the main housing cover plate, by plastic or the like. As shown in fig. 3 and 7, the driving

circuits

230 and 430 may be embodied in circuit boards, which provide switching driving signals to the switching

power modules

220 and 420, respectively, to control the on and off of each of the

power switching elements

222 and 422. In one embodiment, as shown in fig. 6, the inverter power module assembly 200 further includes a current sensor 260, and the inverter power module assembly 400 is also provided with a current sensor (not shown).

In one embodiment, as shown in fig. 3 and 8, the electronic power controller 10 further includes a low voltage control circuit 500, and the low voltage control circuit 500 may be used to control the driving

circuits

230 and 430, for example, to implement the function of controlling the ac motor. The low voltage control circuit 500 is low in operating voltage and low in current, and therefore is easily interfered by electromagnetic interference of high current and high voltage signals of the dc bus assembly 100, the

capacitors

210 and 410, the switching

power modules

220 and 420, the first ac output bus interface 240 and the second ac output bus interface 440 inside the PEU10, and in order to avoid the electromagnetic interference, a shielding plate 600 is further provided corresponding to the low voltage control circuit 500, and the shielding plate 600 may be provided between the low voltage control circuit 500 and the inverter power module assembly 200, or between the low voltage control circuit 500 and the inverter power module assembly 400, and has an effect of isolating electromagnetic interference of high voltage current signals. Specifically, the shielding plate 600 is designed as a metal sheet metal part, and the material thereof uses galvanized carbon steel; this sheet metal component regional convex rib that contains all around makes the shield plate wrap up low pressure control circuit 500 from structural, realizes keeping apart low pressure control circuit 500's signal. The low-voltage control circuit 500 may be embodied as a circuit board.

When the PEU10 of the above embodiment is in operation, the first switching output bus 250 may output a three-phase ac output (U1, V1, W1), and the second switching output bus 450 may output another three-phase ac output (U2, V2, W2), i.e., the ac output 24 has six phases corresponding to two three-phase ac outputs. If the ac machine is a three-phase ac machine, the three-phase ac output of the first switching output bus 250 and the three-phase ac output of the second switching output bus 450 are electrically in phase, and they may simultaneously provide a superimposed three-phase ac output for the three-phase machine, e.g., U1 and U2, V1 and V2, and W1 and W2 are respectively electrically connected to the three-phase windings of the three-phase ac machine, and are thus electrically connected to the three-phase windings of the three-phase ac machine in a corresponding superimposed manner. If the ac machine is a six-phase ac machine, the three-phase ac output of the first switching output bus 250 and the three-phase ac output of the second switching output bus 450 are electrically out of phase by, for example, 60 °, and the three-phase ac output of the first switching output bus 250 and the three-phase ac output of the second switching output bus 450 combine to provide a six-phase ac machine with six-phase ac outputs, e.g., U1, U2, V1, V2, W1, and W2, electrically connected to the six-phase windings of the six-phase ac machine, respectively.

The PEU10 of the above embodiment of the present invention is installed and applied to an electric vehicle to drive an ac motor, thereby forming an electric vehicle of an embodiment of the present invention. The electric automobile of the embodiment of the invention can use a three-phase alternating current motor and can also use a six-phase alternating current motor. When a three-phase alternating current motor is used, U1 and U2, V1 and V2, and W1 and W2 are respectively connected to three-phase windings of the three-phase alternating current motor. When a six-phase ac motor is used, the three-phase ac output of the first switching output bus 250 and the three-phase ac output of the second switching output bus 450 are electrically different by, for example, 60 °, and U1, U2, V1, V2, W1, and W2 are connected to the six-phase winding of the six-phase ac motor, respectively.

It should be noted that the PEU10 of the embodiment of the present invention is not limited to be applied to electric vehicles, and it will be understood from the above disclosure that the PEU10 of the embodiment of the present invention can also be applied to machines or devices having the usage requirements of ac motors similar to electric vehicles.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present.

The above examples mainly illustrate the power electronic controller and the electric vehicle of the present invention. Although only a few embodiments of the present invention have been described, those skilled in the art will appreciate that the present invention may be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

1. An electronic power controller (10) for providing an ac input to and controlling an ac motor, comprising:

a first inversion power module assembly (200) and a second inversion power module assembly (400) which are arranged in parallel; and

a cooling interlayer (300) interposed between the first and second inverter power module assemblies;

wherein the first and second inverter power module assemblies (200, 400) are connected in parallel from the same high voltage dc input terminal (101) of the power electronic controller (10) to an external high voltage dc power supply and output ac output in parallel to the ac output terminal (24) thereof;

a cooling flow channel (310) common to the first inverter power module assembly (200) and the second inverter power module assembly (400) is arranged in the cooling interlayer (300);

the first inverter power module assembly (200) and the second inverter power module assembly (400) are respectively provided with heat dissipation parts (221, 421), and the heat dissipation parts (221, 421) at least partially extend into the cooling flow channel (310) in an opposite manner.

2. The power electronic controller (10) of claim 1, wherein a dc bus bar assembly (100) electrically connected to the high voltage dc input terminal (101) for equally dividing the external high voltage dc power source into two dc inputs is provided inside the power electronic controller (10); the direct current bus bar assembly (100) is provided with a first direct current bar (120) and a second direct current bar (140) which are arranged in parallel and correspond to the two direct current inputs respectively, and the first inversion power module assembly (200) and the second inversion power module assembly (400) are electrically connected to the first direct current bar (120) and the second direct current bar (140) respectively.

3. The electronic power controller of claim 2, wherein the dc bus assembly (100) further comprises a filter capacitor (110) and a filter inductor (130).

4. The power electronic controller (10) of claim 1, wherein the first inverter power module assembly (200) and the second inverter power module assembly (400) each comprise:

a capacitance (210, 410);

a switching power module (220, 420); and

a drive circuit (230, 430);

wherein the heat dissipation members (221, 421) are respectively disposed on the switching power modules (220, 420).

5. The electronic power controller (10) of claim 4, wherein the capacitors (210, 410) of the first and second inverter power module assemblies (200, 400) are attached to the upper and lower surfaces of the cooling sandwich (300), respectively, or are at least partially disposed in the cooling flow channels (310) of the cooling sandwich (300).

6. The power electronic controller (10) of claim 1 or 4, wherein the first inverter power module assembly (200) includes a first AC output bus interface (240) for configuring the AC output (24), and the second inverter power module assembly (400) includes a second AC output bus interface (440) for configuring the AC output (24).

7. The electronic power controller (10) of claim 6, wherein a switching bus (442) for forming the ac output (24) is provided in each case for the second ac output bus interface (440)/the first ac output bus interface (240), wherein a first end of the switching bus (442) is connected to the second ac output bus interface (440)/the first ac output bus interface (240).

8. The electronic power controller (10) of claim 7, wherein a height of the transition bus (442) is equal to a difference in height of the first ac output bus interface (240) and the second ac output bus interface (440), and wherein the second end of the transition bus (442) and the first ac output bus interface (240)/the second ac output bus interface (440) are linearly arranged at a same height.

9. The electronic power controller (10) of claim 7 or 8, wherein a first switching output bus (250) for forming the ac output (24) is provided for the first ac output bus interface (240)/the second ac output bus interface (440), a second switching output bus (450) for forming the ac output (24) is provided for the second end of the switching bus (442), and the first switching output bus (250) and the second switching output bus (450) are arranged linearly next to one another.

10. The power electronic controller (10) of claim 9, wherein the ac output (24) further comprises a filter inductance (245) disposed on the first and second transition output bus bars (250, 450).

11. The power electronic controller (10) of claim 4, wherein the first and second inverter power module assemblies (200, 400) each further comprise a current sensor (260).

12. The power electronic controller (10) of claim 1 wherein the ac output (24) has three phase lines corresponding to a first three phase ac output of a first inverter power module assembly (200) and three phase lines corresponding to a second three phase ac output of a second inverter power module assembly (400).

13. The power electronic controller (10) of claim 12 wherein the three phase lines of the first three phase ac output and the three phase lines of the second three phase ac output are electrically connected in superposition to three phase windings of a three phase ac motor.

14. The electronic power controller (10) of claim 12, wherein the three phase lines for the first three-phase ac output and the three phase lines for the second three-phase ac output are each electrically connected to a six-phase winding of a six-phase ac motor.

15. The power electronic controller (10) of claim 1, wherein the power electronic controller (10) is configured as a box structure (11), and the first inverter power module assembly (200), the cooling sandwich (300), and the second inverter power module assembly (400) are used to form an upper layer, a middle layer, and a lower layer of the box structure (11), respectively.

16. The power electronic controller (10) of claim 15, wherein the cooling sandwich (300) is configured as part of a main box of the box structure (11), and the first and second inverter power module assemblies (200, 400) are symmetrically distributed on upper and lower sides of the cooling sandwich (300).

17. The power electronic controller (10) of claim 1, wherein the power electronic controller (10) further comprises a low voltage control circuit (500) and a shield plate (600), wherein the shield plate (600) is disposed between the low voltage control circuit (500) and the first or second inverter power module assembly (200, 400) for shielding electromagnetic interference of high voltage current signals.

18. An electric vehicle comprising an alternating current motor for outputting power, characterized by further comprising an electronic power controller (10) according to any one of claims 1 to 17.