CN211090110U

CN211090110U - anti-EMI circuit board and motor controller

Info

Publication number: CN211090110U
Application number: CN201921600688.1U
Authority: CN
Inventors: 张�雄; 宋彦明; 李锦达
Original assignee: Shenzhen Hopewind Electric Co Ltd
Current assignee: Shenzhen Hopewind Electric Co Ltd
Priority date: 2019-09-25
Filing date: 2019-09-25
Publication date: 2020-07-24
Anticipated expiration: 2029-09-25

Abstract

The application discloses anti EMI circuit board and machine controller. The EMI resistant circuit board is arranged on the terminal seat and comprises a PCB (printed Circuit Board) on which the absorption capacitor bank is integrated and one or more conductive studs fixed on the PCB, and the conductive studs and the absorption capacitor bank are electrically connected through internal wiring of the PCB; the PCB board is fixed on the terminal seat, and the terminal seat is provided with a corresponding through hole, so that the conductive stud on the PCB board passes through the through hole and is exposed out of the other side of the terminal seat. According to the anti-EMI circuit board, the absorption capacitor is integrated on the PCB to achieve the anti-EMI function, the anti-EMI circuit board is arranged in the inner concave area on the terminal base, the inner space of the structural member is fully utilized, and the problem that the outer space is limited is solved; the power copper bar is electrically communicated with the EMI resistant circuit board through the conductive stud, and the connection mode is convenient and reliable; meanwhile, the anti-EMI circuit board is positioned in the terminal seat, so that the appearance is invisible, and the connection mode is more attractive.

Description

anti-EMI circuit board and motor controller

Technical Field

The utility model belongs to the technical field of power electronics, specifically be the machine controller who relates to EMI circuit board and applied this EMI circuit board that has anti EMI function.

Background

In recent years, motor controllers have been increasingly used in various drive systems. Because the motor controller adopts a voltage source pulse modulation (PWM) control mode, power electronic devices in the frequency converter work in a switching state, du/dt and di/dt are large, and switching voltage and current both contain rich higher harmonics, the problem of electromagnetic interference (EMI) of the motor controller is particularly prominent, and the normal work of surrounding systems is seriously influenced. At present, to address this phenomenon, one pin of an absorption capacitor is generally connected to an input or output power end of the whole device, and the other pin is grounded, so as to achieve an anti-EMI (electromagnetic interference) function.

There are two main schemes for implementing the EMI resistance in the prior art: one is that the absorption capacitor pin is welded with a cable with a certain length, and the cable is communicated with the power copper bar and the box body, so that the absorption capacitor is easy to be damaged in the assembling process, the connection is unreliable, and the appearance is not good; the other type is that absorption capacitor welds on the PCB board, through cable or double-screw bolt and power copper bar and box intercommunication, and this kind of scheme, absorption capacitor PCB board is generally fixed in the copper bar top, can occupy more space.

SUMMERY OF THE UTILITY MODEL

The following presents a simplified summary of embodiments of the invention in order to provide a basic understanding of some aspects of the invention. It should be understood that the following summary is not an exhaustive overview of the invention. It is not intended to identify key or critical elements of the invention or to delineate the scope of the invention. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

According to one aspect of the application, an anti-EMI circuit board is provided, which is disposed on a terminal base, and includes a PCB board having an absorption capacitor bank integrated thereon, and one or more conductive studs fixed on the PCB board, wherein the conductive studs and the absorption capacitor bank are electrically connected by routing inside the PCB board; the PCB board is fixed on the terminal seat, and the terminal seat is provided with a corresponding through hole, so that the conductive stud on the PCB board passes through the through hole and is exposed out of the other side of the terminal seat. The PCB can be fixed on the terminal base in a screw fastening mode.

The conductive stud is fixed on the PCB board in a screw fastening or welding mode. The absorption capacitor bank comprises 1 or more capacitors.

In order to save the internal space of the structural member, the terminal block is provided with a depressed area, and the PCB is arranged in the depressed area. Wherein, the same terminal block can be provided with 1 or a plurality of anti-EMI circuit boards, and the number of the depressed areas can be correspondingly provided with a plurality.

Furthermore, the power copper bar is used for input or output, a through hole is formed in the power copper bar, the power copper bar is sleeved on the conductive stud exposed on the other side of the terminal seat and electrically connected with the conductive stud, and the power copper bar is electrically connected with the absorption capacitor bank through the conductive stud and the internal wiring of the PCB.

Furthermore, the PCB board is also fixed on the box body and is connected with the box body by PE. The PCB board may be fixed by means of screw fastening. The PE connection is a conductor that connects the exposed conductive portion of the electrical device to ground.

In order to further reduce the area of the single plate and save the cost, the terminal block is realized by insulating materials.

According to another aspect of the present application, there is also provided a motor controller implemented using the above-mentioned EMI resistant circuit board.

This application is through above-mentioned scheme, with the collection of absorption capacitance in order to realize anti EMI function at the PCB board, compares with prior art, has following advantage: 1. the anti-EMI circuit board is arranged in the inner sunken area on the terminal seat, the inner space of the structural member is fully utilized, and the problem of limited outer space is solved; 2. the terminal seat is made of insulating materials, so that the space occupied by the EMI resistant circuit board can be effectively reduced, the area of a single board is reduced, and the cost is saved; 3. the power copper bar is electrically communicated with the EMI resistant circuit board through the conductive stud, and the connection mode is convenient and reliable; 4. meanwhile, the anti-EMI circuit board is positioned in the terminal seat, so that the appearance is invisible, and the connection mode is more attractive.

Drawings

The invention may be better understood by referring to the following description in conjunction with the accompanying drawings, in which like reference numerals are used to designate like or similar parts throughout the figures thereof. The accompanying drawings, which are incorporated in and form a part of this specification, illustrate preferred embodiments of the present invention and, together with the detailed description, serve to explain the principles and advantages of the invention. In the drawings:

fig. 1a is a schematic front view of a first EMI-resistant circuit board in this embodiment, fig. 1b is a schematic back view of the first EMI-resistant circuit board in this embodiment, fig. 1c is a schematic front view of a second EMI-resistant circuit board in this embodiment, and fig. 1d is a schematic back view of the second EMI-resistant circuit board in this embodiment;

fig. 2a is a schematic front view illustrating the first and second EMI resistant circuit boards mounted on the terminal block in the present embodiment, and fig. 2b is a schematic back view illustrating the first and second EMI resistant circuit boards mounted on the terminal block in the present embodiment;

FIG. 3 is a schematic view of the connection of the first EMI resistant circuit board and the second EMI resistant circuit board mounted on the case in the embodiment;

fig. 4 is a schematic diagram of the first anti-EMI circuit board and the second anti-EMI circuit board connected to the power copper bar in this embodiment.

Detailed Description

Embodiments of the present invention will be described below with reference to the accompanying drawings. It should be noted that the figures and descriptions have omitted, for the sake of clarity, the representation and description of components and processes that are not relevant to the present invention and known to those of ordinary skill in the art.

In the description of the present invention, it is to be understood that the terms "first," "second," "third," and the like 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 is to 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; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

This patent provides an anti EMI board and machine controller to prior art's not enough. Under the condition of compact installation space, the space is reasonably utilized, and the anti-EMI (electromagnetic interference) function is conveniently and reliably realized.

Specifically, referring to fig. 1a and 1b, the EMI-resistant board 2 is composed of a PCB 28, an absorption capacitor bank 27, a first conductive stud 24 and a second conductive stud 25, where the absorption capacitor bank 27 may be composed of 1 or more capacitors, the first conductive stud 24 and the second conductive stud 25 may be fixed on the PCB 28 by fastening with screws, welding or other methods, and the first conductive stud 24 and the second conductive stud 25 are communicated with the absorption capacitor bank 27 by routing lines inside the PCB 28.

Referring to fig. 1c and 1d, the EMI-resistant board 3 is composed of a PCB 39, an absorption capacitor set 38, a third conductive stud 34, a fourth conductive stud 35 and a fifth conductive stud 36, the third conductive stud 34, the fourth conductive stud 35 and the fifth conductive stud 36 may be fixed on the PCB 39 by screwing, welding or other methods, and the third conductive stud 34, the fourth conductive stud 35 and the fifth conductive stud 36 are communicated with the absorption capacitor set 38 through internal routing of the PCB 39.

First and second

conductive studs

24 and 25, third and fourth

conductive studs

34 and 35, and fifth conductive stud 36

As shown in fig. 2a and 2b, the EMI shield 2 is fixed to the terminal block 1 by first and

second screws

21 and 22, and the EMI shield 3 is fixed to the terminal block 1 by third and

fourth screws

31 and 32. The EMI-resistant plate 2 and the EMI-resistant plate 3 are fixed to the recessed areas on the terminal block 1. The first conductive stud 24 is fixed on the EMI resistant plate 2 through a screw 23, and the second conductive stud 25 is welded on the EMI resistant plate 2; the stud 34 is fixed to the EMI-resistant plate 3 by a screw 33, and the stud 35 and the stud 36 are welded to the EMI-resistant plate 3. The studs on the anti-EMI plate 2 and the anti-EMI plate 3 penetrate through the terminal base 1 and are exposed to the other surface of the terminal base 1.

As shown in fig. 3, the EMI shield 2 and the EMI shield 3 are fixed to the case 9 by

screws

26 and 37, respectively, to realize PE connection. The PE connection may communicate with the tank in a direct or indirect manner.

As shown in fig. 4, the first power copper bar 4, the second power copper bar 5, the third power copper bar 6, the fourth power copper bar 7 and the fifth power copper bar 8 are respectively communicated with the second conductive stud 25, the first conductive stud 24, the fourth conductive stud 35, the third conductive stud 34 and the fifth conductive stud 36.

The power copper bar for output or input is communicated with one end of an absorption capacitor bank on the anti-EMI plate through the conductive studs and the internal wiring of the PCB, and the other end of the absorption capacitor bank is connected with the PE of the box body through the internal wiring of the PCB and screw fastening, so that the anti-EMI function is realized.

Through the scheme, as shown in fig. 2a and 2b, the EMI plates 2 and 3 are fixed on the inner sunken area of the terminal base 1, so that the inner space of the structural member is fully utilized, and the problem of limited outer space is solved; the terminal seat 1 is made of insulating materials, so that the space occupied by the EMI plates 2 and 3 can be effectively reduced, the area of a single plate is reduced, and the cost is saved; meanwhile, as shown in fig. 4, the power copper bar is electrically communicated with the single EMI plate through the stud, and the connection mode is convenient and reliable; as shown in fig. 3, the EMI plates 2 and 3 are inside the terminal block, and are invisible in appearance, so that the connection mode is more attractive.

It should be emphasized that the term "comprises/comprising" when used herein, is taken to specify the presence of stated features, elements, steps or components, but does not preclude the presence or addition of one or more other features, elements, steps or components.

While the present invention has been disclosed above by the description of specific embodiments thereof, it should be understood that all of the embodiments and examples described above are illustrative and not restrictive. Various modifications, improvements or equivalents to the invention may be devised by those skilled in the art within the spirit and scope of the appended claims. Such modifications, improvements and equivalents are also intended to be included within the scope of the present invention.

Claims

1. An anti-EMI circuit board is arranged on a terminal seat, and is characterized in that: the absorption capacitor bank is integrated on the PCB, and one or more conductive studs are fixed on the PCB, and the conductive studs and the absorption capacitor bank are electrically connected through internal wiring of the PCB;

the PCB board is fixed on the terminal seat, and the terminal seat is provided with a corresponding through hole, so that the conductive stud on the PCB board passes through the through hole and is exposed out of the other side of the terminal seat.

2. The EMI resistant circuit board of claim 1, wherein: the power copper bar is provided with a through hole, is sleeved on the conductive stud exposed on the other side of the terminal seat and is electrically connected with the conductive stud, and is electrically connected with the absorption capacitor bank through the conductive stud and the internal wiring of the PCB.

3. The EMI resistant circuit board of claim 1, wherein: the PCB is fixed on the box body and is connected with the box body through PE.

4. The EMI resistant circuit board of claim 3, wherein: the PCB is fixed on the box body in a screw fastening mode.

5. The EMI resistant circuit board of claim 1, wherein: the terminal block is provided with a depressed area, and the PCB is arranged in the depressed area.

6. The EMI resistant circuit board of claim 1, wherein: the PCB is fixed on the terminal base in a screw fastening mode.

7. The EMI resistant circuit board of claim 1, wherein: the conductive stud is fixed on the PCB board in a screw fastening or welding mode.

8. The EMI resistant circuit board of claim 1, wherein: the absorption capacitor bank comprises 1 or more capacitors.

9. The EMI resistant circuit board of claim 1, wherein: the terminal seat is realized by insulating materials.

10. A motor controller comprising the EMI resistant circuit board as recited in any one of claims 1 to 9.