CN114567963A

CN114567963A - Motor controller control board and grounding method thereof

Info

Publication number: CN114567963A
Application number: CN202011367471.8A
Authority: CN
Inventors: 朱思维; 姜康宁; 王坚; 古强; 张迪德; 乐林红; 肖泽广
Original assignee: CRRC Electric Vehicle Co Ltd
Current assignee: CRRC Electric Vehicle Co Ltd
Priority date: 2020-11-27
Filing date: 2020-11-27
Publication date: 2022-05-31

Abstract

The invention provides a motor controller control panel, which is suitable for new energy vehicles and comprises: the PCB comprises at least 4 layers of PCBs, wherein the surface layer and the bottom layer of the motor controller control panel are used for arranging signal lines of the motor controller, and the inner layer of the motor controller control panel is used for arranging power lines and ground lines of the motor controller.

Description

Motor controller control board and grounding method thereof

Technical Field

The invention relates to the field of motor controllers, in particular to a motor controller control board and a grounding method thereof.

Background

At present, the EMC (electromagnetic compatibility) performance of new energy vehicles is increasingly important, and mandatory standards are provided at home and abroad to meet the requirements on the EMC performance of the whole vehicle. On new energy vehicles, an electric drive system is a very critical part, and the EMC performance of the electric drive system can also determine the EMC performance of most whole vehicles.

When the new energy vehicle electric drive system is subjected to EMC test, the problem of grounding of the control board is often a main source of EMC problem of the electric drive system. The motor controller control board of the new energy vehicle needs to provide different required power supplies for other electronic components in the motor controller under the voltage of 12V or 24V supplied by a whole vehicle storage battery, so that various DC/DC circuits are included on the motor controller control board, for example, 24V to 15V, 15V to 8V and the like. The various DC/DC circuits generate ground signals (GND) corresponding to the respective levels.

Because the motor controller control panel has circuit structures of various DC/DC power supplies, active devices, analog-to-digital converters and the like, the wiring is complex, the number of I/O ports is large, the motor controller control panel has multiple functions due to the factors, and the EMC problem is difficult to deal with.

In order to solve the above problems, the present invention is directed to a motor controller control board and a grounding method thereof, so as to solve the problem that the potentials of the ground signals corresponding to different levels may be different.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

According to an aspect of the present invention, there is provided a motor controller control board adapted for a new energy vehicle, the motor controller control board including: the PCB comprises at least 4 layers of PCBs, wherein the surface layer and the bottom layer of the motor controller control panel are used for arranging signal lines of the motor controller, and the inner layer of the motor controller control panel is used for arranging power lines and ground lines of the motor controller.

In one embodiment, the PCB board where the ground wire is located is coated with copper so as to place different signals at the same potential.

In one embodiment, the motor controller control board is provided with a screw mounting hole, the PCB board where the ground wire is located has a lead-out end, and the lead-out end is close to the screw mounting hole and is electrically connected with the screw mounting hole.

In one embodiment, the screw mounting hole is metalized, and the terminal is connected with the screw mounting hole through a 0 Ω resistor.

In one embodiment, the motor controller control board further comprises a metal screw, and the metal screw fixedly installs the motor controller control board in a motor controller box body through the screw installation hole so as to realize the electrical connection between the motor controller control board and the vehicle body of the new energy vehicle.

According to another aspect of the present invention, there is also provided a grounding method of a motor controller control board adapted for a new energy vehicle, the motor controller control board including at least a 4-layer PCB board, the grounding method including: and arranging signal wires of the motor controller on the surface layer and the bottom layer of the motor controller control panel, and arranging power wires and ground wires of the motor controller on the inner layer of the motor controller control panel.

In one embodiment, the grounding method of the motor controller control board further comprises: and covering copper on the PCB where the ground wire is positioned so as to place different signals on the same potential.

In one embodiment, the motor controller control board includes a screw mounting hole, and the grounding method of the motor controller control board further includes: a leading-out end is arranged on the PCB where the ground wire is located and close to the position of the screw mounting hole; and electrically connecting the leading-out terminal with the screw mounting hole.

In one embodiment, the electrically connecting the terminal with the screw mounting hole includes: metallizing the screw mounting hole; and connecting the leading-out terminal with the screw mounting hole through a 0 omega resistor.

In one embodiment, the grounding method of the motor controller control board further comprises: and inserting a metal screw into the motor controller box through the screw mounting hole to fixedly mount the motor controller control panel on the motor controller box so as to realize the electrical connection between the motor controller control panel and the vehicle body of the new energy vehicle.

According to the invention, the ground wire of the motor controller control board is arranged on the inner PCB, and the grounding impedance of the motor controller is reduced by covering copper.

According to the invention, the ground wire of the motor controller control panel is led out and connected with the motor controller box, so that the motor controller control panel and the motor controller box form a metal shield, the grounding impedance of the low-voltage part of the motor controller is effectively reduced, and the EMC performance of the motor controller is improved.

Drawings

The above features and advantages of the present disclosure will be better understood upon reading the detailed description of embodiments of the disclosure in conjunction with the following drawings.

FIG. 1 is a schematic diagram of a wiring scheme of a motor controller control board according to a wiring scheme of a conventional motor controller control board;

FIG. 2 is a schematic diagram of a wiring scheme for a motor controller control board in one embodiment according to one aspect of the present invention;

FIG. 3 is a schematic diagram of a connection scheme of a motor controller control board and a motor controller box in an embodiment according to an aspect of the present invention;

fig. 4 is a schematic diagram of the PCB connection scheme in fig. 3 illustrating the formation of a metal shield according to an aspect of the present invention.

Detailed Description

The following description is presented to enable any person skilled in the art to make and use the invention and is incorporated in the context of a particular application. Various modifications, as well as various uses in different applications will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to a wide range of embodiments. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

In the following detailed description, numerous specific details are set forth in order to provide a more thorough understanding of the invention. It will be apparent, however, to one skilled in the art that the practice of the invention may not necessarily be limited to these specific details. In other instances, well-known structures and devices are shown in block diagram form, rather than in detail, in order to avoid obscuring the present invention.

The reader's attention is directed to all papers and documents which are filed concurrently with this specification and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference. All the features disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

Note that where used, the designations left, right, front, back, top, bottom, positive, negative, clockwise, and counterclockwise are used for convenience only and do not imply any particular fixed orientation. In fact, they are used to reflect the relative position and/or orientation between the various parts of the object. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or electrical connection; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

It is noted that, where used, further, preferably, still further and more preferably is a brief introduction to the exposition of the alternative embodiment on the basis of the preceding embodiment, the contents of the further, preferably, still further or more preferably back band being combined with the preceding embodiment as a complete constituent of the alternative embodiment. Several further, preferred, still further or more preferred arrangements of the belt after the same embodiment may be combined in any combination to form a further embodiment.

The invention is described in detail below with reference to the figures and specific embodiments. It is noted that the aspects described below in connection with the figures and the specific embodiments are only exemplary and should not be construed as imposing any limitation on the scope of the present invention.

For ease of understanding, the structure of a conventional motor controller control board, which generally has signal lines, ground lines, and power lines, will first be briefly described. Taking the motor controller control board with the 4-layer PCB structure shown in fig. 1 as an example, the wiring design of the conventional motor controller control board is as shown in fig. 1, the ground wire and the power wire are respectively arranged on the surface layer and the bottom layer of the motor controller control board, and the signal wire is arranged on the inner layer of the motor controller control board.

According to one aspect of the invention, a motor controller control board is provided, which is suitable for new energy vehicles. For ease of understanding, the present invention describes a grounding method of a motor controller control board corresponding to a motor controller control board mixedly with the motor controller control board so as to correspond to each other.

In one embodiment, the motor controller control board at least comprises a 4-layer PCB board, wherein the surface layer and the bottom layer of the motor controller control board are used for arranging signal lines of the motor controller, and the inner layer of the motor controller control board is used for arranging power lines and ground lines of the motor controller.

Correspondingly, the grounding method of the motor controller control board can comprise the step of arranging a signal wire, a power wire and a ground wire.

Specifically, the arrangement steps of the signal wire, the power wire and the ground wire of the motor controller control board are as follows: and arranging signal wires of the motor controller on the surface layer and the bottom layer of the motor controller control panel, and arranging power wires and ground wires of the motor controller on the inner layer of the motor controller control panel.

Taking the motor controller control board of the 4-layer PCB structure shown in fig. 2 as an example, the surface layer and the bottom layer are used for arranging signal lines, and the ground line and the power line are respectively arranged on the two inner layers.

In a more preferred embodiment, the PCB board on which the ground is located has a large area copper clad to place different signals at the same potential.

Copper-clad refers to using the unused space on the PCB as a reference surface and then filling with solid copper, these copper areas are also known as copper-filled. The copper coating can reduce the impedance of the ground wire and improve the anti-interference capability; the voltage drop can be reduced, and the power supply efficiency is improved; the copper is covered with the ground wire and connected, so that the loop area can be reduced.

Correspondingly, the grounding method of the motor controller control board can further comprise the step of coating copper on the grounding layer. The method comprises the following specific steps: and copper is coated on the PCB where the ground wire is positioned so as to place different signals on the same potential.

Further, the motor controller control board is generally provided with a screw mounting hole for fixedly mounting the motor controller control board. Fig. 3 shows a schematic diagram of a connection scheme of the motor controller control board and the motor controller box. As shown in fig. 3, the PCB board where the ground wire is located has a terminal 1 which is as close as possible to the screw mounting hole 2 and is electrically connected to the screw mounting hole.

Correspondingly, the grounding method of the motor controller control board can further comprise the step of leading out a ground wire.

Specifically, the steps of leading out the ground wire of the motor controller control board are as follows: a leading-out end is arranged at a position, close to the screw mounting hole, on the PCB where the ground wire is arranged; and electrically connecting the lead-out terminal with the screw mounting hole.

Specifically, the screw mounting hole may be metalized, and the terminal 1 may be connected to the screw mounting hole using a 0 Ω resistor. Fig. 3 is a specific PCB design diagram, wherein R651 and R733 in fig. 3 are 0 Ω resistors, and C126 is a capacitor.

Correspondingly, the step of leading out the ground wire of the motor controller control board can be embodied as follows: metallizing the screw mounting hole; and connecting the leading-out terminal with the screw mounting hole through a 0 omega resistor.

Further, when the motor controller control panel is installed, the metal screw 3 fixedly installs the motor controller control panel in the motor controller box through the screw installation hole 2, so as to realize the electrical connection between the motor controller control panel and the motor controller box.

Correspondingly, the grounding method of the motor controller control board can further comprise the step of installing the motor controller control board.

Specifically, the installation steps of the motor controller control board are as follows: and inserting a metal screw into the motor controller box through the screw mounting hole to fixedly mount the motor controller control panel on the motor controller box so as to realize the electrical connection between the motor controller control panel and the vehicle body of the new energy vehicle.

It can be understood that the electrical connection of the motor controller control board and the motor controller box can realize the electrical connection of each ground wire of the motor controller control board and the box, and further the low impedance connection of the low frequency band and the vehicle body.

Fig. 4 shows a schematic diagram of the PCB design of fig. 3 forming a metal shield. As shown in fig. 4, the ground GND is connected to the ground (EARTH) through 0 Ω resistors (R651 and R733).

While, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as would be understood by one skilled in the art.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

In one or more exemplary embodiments, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software as a computer program product, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a web site, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave, then the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk (disk) and disc (disc), as used herein, includes Compact Disc (CD), laser disc, optical disc, Digital Versatile Disc (DVD), floppy disk and blu-ray disc where disks (disks) usually reproduce data magnetically, while discs (discs) reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. It is to be understood that the scope of the invention is to be defined by the appended claims and not by the specific constructions and components of the embodiments illustrated above. Those skilled in the art can make various changes and modifications to the embodiments within the spirit and scope of the present invention, and such changes and modifications also fall within the scope of the present invention.

Claims

1. A motor controller control panel adapted for use with a new energy vehicle, the motor controller control panel comprising:

the PCB comprises at least 4 layers of PCBs, wherein the surface layer and the bottom layer of the motor controller control panel are used for arranging signal lines of the motor controller, and the inner layer of the motor controller control panel is used for arranging power lines and ground lines of the motor controller.

2. The motor controller control board of claim 1, wherein the PCB on which the ground line is located is coated with copper to put different signals on the same potential.

3. The motor controller control board according to claim 2, wherein a screw mounting hole is provided in the motor controller control board, and the PCB board on which the ground wire is located has a terminal which is adjacent to and electrically connected to the screw mounting hole.

4. The motor controller control board of claim 3, wherein said screw mounting holes are metalized, and said terminals are connected to said screw mounting holes through a 0 Ω resistor.

5. The motor controller control panel of claim 3, further comprising a metal screw that fixedly mounts the motor controller control panel within a motor controller housing through the screw mounting hole to enable electrical connection of the motor controller control panel with a body of the new energy vehicle.

6. A grounding method of a motor controller control board is applicable to a new energy vehicle, the motor controller control board comprises at least 4 layers of PCBs, and the grounding method comprises the following steps:

and arranging signal wires of the motor controller on the surface layer and the bottom layer of the motor controller control panel, and arranging power wires and ground wires of the motor controller on the inner layer of the motor controller control panel.

7. The method of grounding of claim 6, further comprising:

and covering copper on the PCB where the ground wire is positioned so as to place different signals on the same potential.

8. The grounding method of claim 7, wherein the motor controller control board includes screw mounting holes, the grounding method further comprising:

a leading-out end is arranged on the PCB where the ground wire is located and close to the position of the screw mounting hole; and

and electrically connecting the leading-out end with the screw mounting hole.

9. The method of grounding of claim 8, wherein said electrically connecting said terminal to said screw mounting hole comprises:

metallizing the screw mounting hole; and

and connecting the leading-out end with the screw mounting hole through a 0 omega resistor.

10. The method of grounding of claim 8, further comprising:

and inserting a metal screw into the motor controller box through the screw mounting hole to fixedly mount the motor controller control panel on the motor controller box so as to realize the electrical connection between the motor controller control panel and the vehicle body of the new energy vehicle.