CN218274274U

CN218274274U - DC-Link capacitor for double-motor inverter and double-circuit inverter

Info

Publication number: CN218274274U
Application number: CN202221679010.9U
Authority: CN
Inventors: 卢航宇; 孙新函; 陈俊
Original assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Current assignee: SAIC General Motors Corp Ltd; Pan Asia Technical Automotive Center Co Ltd
Priority date: 2022-07-01
Filing date: 2022-07-01
Publication date: 2023-01-10
Anticipated expiration: 2032-07-01

Abstract

The disclosure discloses a DC-Link capacitor for a dual-motor inverter, which is characterized in that the DC-Link capacitor is configured with: an electromagnetic compatibility (EMC) filter integrated inside the DC-Link capacitor to implement bus current filtering of the DC-Link capacitor; the temperature sensor is integrated inside the DC-Link capacitor so as to feed back the temperature of an inner core of the DC-Link capacitor in real time; and the discharge resistor is configured on the surface of the DC-Link capacitor.

Description

DC-Link capacitor for double-motor inverter and double-circuit inverter

Technical Field

The disclosure relates to the field of automotive electronics, in particular to a DC-Link capacitor for a double-motor inverter and a double-circuit inverter.

Background

The DC-Link capacitor is also called a direct current support capacitor and belongs to a passive device. The existing DC-Link capacitor has the advantages of high voltage resistance, high current resistance, low impedance, low inductance, long service life and the like, and is widely applied to the field of automobile manufacturing.

Two power motors, i.e., dual-motor inverters, are included in the hybrid vehicle. The double-motor inverter comprises an IGBT module, a control panel, a drive plate, a current sensor, a DC-Link capacitor and the like. The DC-Link capacitor is an important component, and is related to the control performance and power density of the double-motor inverter, and the current polypropylene film capacitor is mostly adopted. Compared with an electrolytic capacitor, the polypropylene film capacitor has the advantages of good voltage withstanding property, large ripple current absorption capacity and ultra-long service life.

However, the ESR (equivalent series resistance) and ESL (equivalent series inductance) of the DC-Link capacitor used in the two-motor inverter in the related art are large and do not have a current filtering function.

Disclosure of Invention

To solve one or more of the above technical problems, according to one aspect of the present disclosure, there is provided a DC-Link capacitor for a dual motor inverter, the DC-Link capacitor being configured with: an electromagnetic compatibility (EMC) filter integrated within the DC-Link capacitor to enable bus current filtering of the DC-Link capacitor; the temperature sensor is integrated inside the DC-Link capacitor so as to feed back the temperature of an inner core of the DC-Link capacitor in real time; and the discharge resistor is arranged on the surface of the DC-Link capacitor.

Optionally, according to an embodiment of the present disclosure, the DC-Link capacitor for the dual-motor inverter, wherein the discharge resistor is connected to the DC-Link capacitor by PIN soldering.

Optionally, according to an embodiment of the present disclosure, the DC-Link capacitor for the two-motor inverter includes a polypropylene film core sequentially arranged inside the DC-Link capacitor.

Optionally, the DC-Link capacitor for the dual-motor inverter according to an embodiment of the disclosure, wherein the DC-Link capacitor is configured in an "L" shape.

Optionally, according to an embodiment of the present disclosure, the DC-Link capacitor for the dual-motor inverter, wherein a heat dissipation aluminum plate is configured on a surface of the DC-Link capacitor, so as to improve ripple current capability of the DC-Link capacitor.

Optionally, according to an embodiment of the present disclosure, the DC-Link capacitor for the dual-motor inverter is configured with a heat dissipation aluminum plate on a surface thereof.

Optionally, according to an embodiment of the present disclosure, the DC-Link capacitor for the dual-motor inverter is configured with positive and negative terminals connected to the IGBT by a copper plate.

Optionally, the DC-Link capacitor for the two-motor inverter according to an embodiment of the present disclosure, wherein the EMC filter includes 2X capacitors, 4Y capacitors, and a set of nanocrystalline magnetic rings.

Optionally, the DC-Link capacitor for the dual-motor inverter according to an embodiment of the present disclosure, wherein the temperature sensor is a temperature sensitive resistor with a negative temperature coefficient.

The present disclosure also provides a two-way inverter configured with a DC-Link capacitor for a two-motor inverter as described above.

Compared with the prior art, the DC-Link capacitor for the double-motor inverter provided by the embodiment of the disclosure can realize the functions of temperature monitoring, line voltage supporting, bus current filtering, reduction of ESR (equivalent series resistance) and ESL (equivalent series inductance) of an IGBT direct current loop and the like, so that the efficiency and stability of the capacitor in a motor are improved.

Drawings

The above and other objects and advantages of the present disclosure 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 with like reference numerals.

FIG. 1 shows a schematic diagram of a DC-Link capacitor according to one embodiment of the present disclosure.

FIG. 2 shows a schematic diagram of the bottom of a DC-Link capacitor according to one embodiment of the present disclosure.

FIG. 3 shows a schematic diagram of a temperature sensor of a DC-Link capacitor according to one embodiment of the present disclosure.

FIG. 4 shows a circuit diagram of a DC-Link capacitor according to one embodiment of the present disclosure.

Detailed Description

The following description is of some of the several embodiments of the disclosure and is intended to provide a basic understanding of the disclosure. It is not intended to identify key or critical elements of the disclosure or to delineate the scope of the claimed subject matter.

For the purposes of brevity and explanation, the principles of the present disclosure are described herein primarily with reference to exemplary embodiments thereof. However, those skilled in the art will readily recognize that the same principles are equally applicable to all types of application business process orchestration methods and systems, and that these same principles, as well as any such variations, may be implemented therein without departing from the true spirit and scope of the present patent application.

Moreover, in the following description, reference is made to the accompanying drawings that illustrate certain exemplary embodiments. Electrical, mechanical, logical, and structural changes may be made to these embodiments without departing from the spirit and scope of the present disclosure. In addition, while a feature of the present disclosure may have been disclosed with respect to only one of several implementations/embodiments, such feature may be combined with one or more other features of the other implementations/embodiments as may be desired and/or advantageous for any given or identified function. The following description is, therefore, not to be taken in a limiting sense, and the scope of the present disclosure is defined by the appended claims and their equivalents.

The present disclosure relates to a dual motor inverter for use in a hybrid vehicle, wherein a DC-Link capacitor provides bus voltage support, bus current filtering, and reduced ESR (equivalent series resistance) and ESL (equivalent series inductance) of an IGBT DC loop for the dual motor inverter.

FIG. 1 shows a schematic diagram of a DC-Link capacitor, according to one embodiment of the present disclosure. As shown in fig. 1, the DC-Link capacitor 100 has an "L" shape, and internal polypropylene film cores are sequentially arranged, so that the space inside the inverter can be fully utilized. Compared with the traditional cuboid capacitor, the capacitor has a larger heat dissipation area, and the ripple current capability of the capacitor is improved.

Specifically, the DC-Link capacitor 100 includes a current terminal DC bus bar 101, an IGBT terminal DC bus bar 102, a discharge resistance plate mounting bolt hole 103, a discharge resistance plate connection PIN 104, and a discharge resistance plate mounting bolt hole 105. The DC-Link capacitor 100 integrates a passive discharge resistor plate through a discharge resistor plate mounting bolt hole 103, a discharge resistor plate connecting PIN 104, and a discharge resistor plate mounting bolt hole 105. The discharging resistance plate is directly installed on the upper surface of the capacitor through a bolt and welded with the PIN needle extending out of the interior of the capacitor, so that a traditional discharging resistance support, a connecting wire harness and a connector are saved. The dc bus bar connection at the battery end of the capacitor 100 may be connected to the dc bus bar at the battery end by an M6 bolt. The IGBT end dc bus bar connection of the capacitor 100 may be connected to the IGBT positive and negative terminals by laser welding. The discharge resistance plate connection of capacitor 100 may be achieved by fastening the discharge resistance plate to a bolt hole in the upper surface of the capacitor with a bolt M4. And the PIN needle on the upper surface of the capacitor is soldered with the resistor plate to realize electrical connection.

FIG. 2 shows a schematic diagram of the bottom of a DC-Link capacitor according to one embodiment of the present disclosure. As shown in fig. 2, the DC-Link capacitor 200 includes a bottom heat dissipating aluminum plate 201. The lower surface of the DC-Link capacitor 200 is designed by an aluminum plate, so that the heat dissipation effect is improved, the ripple current capacity of the capacitor is improved, and the service life is prolonged.

FIG. 3 shows a schematic diagram of a temperature sensor of a DC-Link capacitor according to one embodiment of the present disclosure. As shown in fig. 3, the DC-Link capacitor 300 adopts two integral copper plates to connect the positive and negative terminals of the IGBT, and this design has a large current-carrying area of the copper bar and a small ESR, which is convenient for heat dissipation. Meanwhile, after the IGBT end direct current busbar is led out of the capacitor, the capacitor is tightly attached to the IGBT end direct current busbar at intervals through insulating paper, stray inductance can be effectively reduced, and the system stray inductance is smaller than 10nH. In addition, note that the side of the capacitor has 4 bolt holes, which can be firmly fixed to the inverter housing. Copper sheathing 302 is embedded in two of them bolt holes, can play the installation positioning effect to provide two ground points for inside Y electric capacity. The capacitor 300 internally integrates a temperature sensor 301. The temperature sensor 301 is a temperature sensitive resistor with a negative temperature coefficient, and can accurately feed back the temperature of the inner core of the capacitor. The temperature sensor 301 is connected to the inverter control board via two wire harnesses and a two PIN connector.

FIG. 4 shows a circuit diagram of a DC-Link capacitor according to one embodiment of the present disclosure. As shown in fig. 4, the DC-Link capacitor 400 may include 2X capacitors, 4Y capacitors, and a set of nanocrystalline magnetic rings, where C1, C2, C3, and C4 are the Y capacitors, and C5 and C6 are the X capacitors. And the X capacitor and the Y capacitor are safety capacitors for automobiles. In other embodiments, the DC-Link capacitors may include other numbers of X capacitors and other numbers of Y capacitors.

The present disclosure also provides a two-way inverter configured with the DC-Link capacitor as described above.

Although only a few embodiments of the present disclosure have been described, those skilled in the art will appreciate that the present disclosure 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 disclosure as defined by the appended claims.

Claims

1. A DC-Link capacitor for a dual motor inverter, the DC-Link capacitor configured with:

an electromagnetic compatibility (EMC) filter integrated inside the DC-Link capacitor to implement bus current filtering of the DC-Link capacitor;

the temperature sensor is integrated inside the DC-Link capacitor so as to feed back the temperature of an internal core of the DC-Link capacitor in real time; and

and the discharge resistor is arranged on the surface of the DC-Link capacitor.

2. The DC-Link capacitor for a dual motor inverter of claim 1, wherein the discharge resistor is connected to the DC-Link capacitor by PIN soldering.

3. The DC-Link capacitor for the two-motor inverter of claim 1, wherein polypropylene film cores are sequentially arranged inside the DC-Link capacitor.

4. The DC-Link capacitor for a two-motor inverter of claim 2, wherein the DC-Link capacitor is configured in an "L" shape.

5. The DC-Link capacitor for a dual-motor inverter of claim 3, wherein the surface of the DC-Link capacitor is configured with heat dissipating aluminum plates to improve ripple current capability of the DC-Link capacitor.

6. The DC-Link capacitor for a two-motor inverter of claim 3, wherein the DC-Link capacitor surface is configured with heat dissipating aluminum plates.

7. The DC-Link capacitor for a dual motor inverter of claim 3, wherein the DC-Link capacitor is configured with copper plate connecting positive and negative terminals of the IGBT.

8. The DC-Link capacitance for a two-motor inverter of claim 1 or 7, wherein the electromagnetic compatibility EMC filter comprises 2X capacitances, 4Y capacitances and a set of nanocrystalline magnetic rings.

9. The DC-Link capacitor for the dual-motor inverter of claim 8, wherein the temperature sensor is a temperature sensitive resistor of negative temperature coefficient.

10. A two-way inverter configured with a DC-Link capacitor for a two-motor inverter as claimed in claims 1-9.