KR102149939B1 - Dc link with integrated emi filter for electric car - Google Patents

Abstract

EMI filter-integrated DC link 90 for an electric vehicle according to the present invention is configured as follows.
Includes a DC link 100 consisting of two input terminals 113 and two output terminals 115, and two bus bars 120 connected to each of the input terminals 113 to match, and the bus bar It includes an insulating sheet 130 interposed between the 120 and an EMI filter 200 mounted on the bus bar 120.
Therefore, it is possible to design a small and light weight, there is an effect that can be easily mounted in the engine room of the electric vehicle.

Description

DC link with integrated EMI filter for electric vehicle {DC LINK WITH INTEGRATED EMI FILTER FOR ELECTRIC CAR}

The present invention relates to a DC link with an integrated EMI filter for an electric vehicle, and more particularly, by integrally mounting an EMI filter on the DC link, it is possible to reduce the size and weight of the driving system of the electric vehicle, and effectively eliminate the fatal adverse effects caused by electromagnetic waves. It relates to a DC link with an integrated EMI filter for an electric vehicle, characterized in that configured to be capable of.

Hereinafter, a drive system 1 mounted on an electric vehicle will be described with reference to the accompanying drawings.

1 is a circuit diagram showing a driving system of a general electric vehicle.

A battery 10 charging a high voltage of DC 150V, a BMS (Battery Management System) that manages basic performance such as SOC (State Of Charge) and temperature of the battery 10, and for driving an electric vehicle It consists of a motor 60 configured with a permanent magnet to generate torque, and an MCU 30 (Motor Control Unit), which is a motor controller that determines and controls the behavioral performance of the motor 60 according to each driving condition of the vehicle.

The MCU 30 is composed of a DC link 35 formed by connecting capacitors in series, a central control unit (CCU 40, Center Control Unit) and an Insulated Gate Bipolar Transistor (IGBT) device that controls the overall behavior of the motor. It is composed of an inverter 50 that is complementarily switched according to the PWM control signal output from the CCU 40 and outputs a DC current in 3-phase AC.

The DC link 35 is composed of a connection of a capacitor to the output DC link terminal of the BMS 20, and the capacitor smoothes the current supplied to the inverter 50 to stabilize the input DC power of the inverter 50 , It reduces and eliminates electromagnetic noise.

However, in the case of the driving system 1 of such an electric vehicle, the electromagnetic waves generated from the motor 60 have a fatal adverse effect on various electronic equipment provided inside the electric vehicle, and thus an abnormal sudden start phenomenon, an abnormal screen output of an LCD instrument panel, It causes an adverse effect of deteriorating the function of sensitive electronic equipment such as abnormal control operation of the microcomputer. In addition, such electromagnetic waves have a problem that adversely affects the driver's health, causing cancer or leukemia.

Accordingly, in order to block the electromagnetic waves, it is possible by connecting an electromagnetic interference (EMI) filter in front of the DC link 35 to supply the filtered electricity to the DC link 35. That is, the EMI filter has a structure in which a busbar output by inputting electricity passes through it, and since the EMI filter is connected in front of the busbar, electromagnetic waves can be blocked. However, in this case, since the EMI (Electromagnetic Interference) filter is generally manufactured in a large weight, there is a problem in that the size and weight of the electric vehicle are increased. Due to this problem, it is still not possible to efficiently solve the above problems caused by electromagnetic waves by installing an EMI filter in an electric vehicle.

(Document 1) Korean Patent Registration No. 10-0610829 (August 02, 2006)

The DC link with an integrated EMI filter for an electric vehicle according to the present invention seeks to solve the following matters.

In general, in order to block electromagnetic waves generated from a motor of an electric vehicle, an EMI filter is connected in front of the busbar passing through the EMI filter, so that electromagnetic waves can be blocked. However, since the EMI (Electromagnetic Interference) filter is generally manufactured in a large weight, there is a problem in that the size and weight of an electric vehicle are increased. Due to this problem, it is still not possible to efficiently solve the adverse effects caused by electromagnetic waves by installing an EMI filter in an electric vehicle.

In order to solve the above problem, the DC link integrated with an EMI filter for an electric vehicle for an electric vehicle according to the present invention is configured as follows.

In the DC link consisting of two input terminals and two output terminals;

And two busbars respectively connected to and matched with the input terminals, an insulating sheet interposed between the busbars, and an EMI filter mounted on the busbars.

The EMI filter includes a magnetic material that simultaneously accommodates circumferences of the bus bar and the insulating sheet and exposes both ends of the bus bar, and a housing that accommodates the magnetic material.

In addition, the busbar is disposed in parallel with the DC link, and the input terminal is disposed on the DC link to be connected to the busbar.

The magnetic material may be provided with ferrite as an example.

In addition, the magnetic material is, for example, a plate shape, formed long along the length direction of the bus bar, and is in close contact with the upper surface of the lower magnetic material and the lower magnetic material having a groove in which the bus bar is accommodated. It includes an upper magnetic body with a groove in which the bus bar is accommodated.

The housing includes, as an example, the lower magnetic body and the upper magnetic body, which are accommodated and attached, and have a C-shaped elastic member that is open toward the front (toward the DC link), an upper plate and a lower plate connected to the upper and lower surfaces of the elastic member, and the elasticity An outer shell covering the section steel, upper plate, and lower plate, a pipe protruding from the outer shell to the rear surface of the DC link and having an insertion hole rearward, and a head at the rear end to be inserted into the pipe so that it can be rotated and rotated by hand. And a formed shaft, and a string connected to the upper plate through the outer shell, penetrating the shaft, and connected to the lower plate through the outer shell.

The DC link with an integrated EMI filter for an electric vehicle according to the present invention can exhibit the following effects by the above solution.

First, in the present application, since the EMI filter is formed by a magnetic material surrounding the bus bar in a state where the bus bar is drawn out, a compact and lightweight design is possible. Therefore, it is possible to reduce the volume occupied in the engine room of the electric vehicle, and there is an effect that it can be mounted without increasing the weight of the vehicle.

Second, because it is easy to install in electric vehicles, there is an adverse effect that deteriorates the functions of sensitive electronic equipment such as abnormal sudden oscillation phenomenon due to electromagnetic waves generated from the electric vehicle motor, abnormal screen output of the LCD instrument panel, abnormal control operation of the microcomputer, etc. There is an effect that can solve serious problems that harm health.

Third, in the case of the EMI filter according to another embodiment of the present application, since it can be easily detached from the bus bar, the assembly work is easy and maintenance is easy.

1 is a circuit diagram showing a driving system of a general electric vehicle.
2 is a perspective view showing an integrated DC link with an EMI filter for an electric vehicle according to the present invention.
3 is a perspective view showing a bus bar of an EMI filter mounted on an integrated DC link with an EMI filter for an electric vehicle according to the present invention.
4 is a perspective view showing that an insulation sheet is placed on the lower surface of the bus bar shown in FIG. 3 and another bus bar is in close contact with the insulation sheet below.
5 is a perspective view showing that the busbars on both sides of FIG. 4 are accommodated in a tubular magnetic body.
Figure 6 is a perspective view showing that the EMI filter is completed because the magnetic material represented in Figure 5 is accommodated in a housing as an insulator.
7 is a perspective view showing another embodiment of an integrated DC link with an EMI filter for an electric vehicle according to the present invention.
8 is a cross-sectional view taken along line F-F' of FIG. 7;
9 is a cross-sectional view illustrating a process of accommodating both busbars in a state in which the housing is opened by rotating the shaft in FIG. 8.

Hereinafter, various embodiments of the present document will be described with reference to the accompanying drawings. However, this is not intended to limit the techniques described in this document to specific embodiments, and it should be understood to include various modifications, equivalents, and/or alternatives of the embodiments of this document. In connection with the description of the drawings, similar reference numerals may be used for similar elements.

In addition, expressions such as "first," "second," etc. used in this document may modify various elements regardless of their order and/or importance, and to distinguish one element from another It is used only and does not limit the components. For example, the'first part' and the'second part' may represent different parts regardless of order or importance. For example, without departing from the scope of the rights described in this document, a first component may be referred to as a second component, and similarly, a second component may be renamed to a first component.

In addition, terms used in this document are only used to describe a specific embodiment, and may not be intended to limit the scope of other embodiments. Singular expressions may include plural expressions unless the context clearly indicates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the technical field described in this document. Among the terms used in this document, terms defined in a general dictionary may be interpreted as having the same or similar meanings as those in the context of the related technology, and unless explicitly defined in this document, an ideal or excessively formal meaning Is not interpreted as. In some cases, even terms defined in this document cannot be interpreted to exclude embodiments of the present document.

Hereinafter, an embodiment of an integrated EMI filter DC link 90 for an electric vehicle according to the present invention for solving the above problems will be described with reference to the accompanying drawings.

2 is a perspective view showing a DC link with an integrated EMI filter for an electric vehicle according to the present invention, and FIG. 3 is a perspective view showing a bus bar of an EMI filter mounted on the DC link with an integrated EMI filter for an electric vehicle according to the present invention. Is a perspective view showing that an insulation sheet is placed on the lower surface of the bus bar shown in FIG. 3 and another bus bar is in close contact with the insulation sheet below, and FIG. 5 shows that the bus bars on both sides of FIG. 4 are accommodated in a tubular magnetic body. It is a perspective view, and FIG. 6 is a perspective view showing that an EMI filter is completed because the magnetic material shown in FIG. 5 is accommodated in a housing as an insulator.

The DC link 100 including two input terminals 113 and two output terminals 115 is configured first. The DC link 100 is a general capacitor connected in series.

In addition, there are two busbars 120 connected to each of the input terminals 113 to match each other, which is formed in a plate shape and is formed to be elongated to be disposed on the side of the DC link 100. And it is configured to match up and down, and the input terminal 113 is disposed on the DC link 100 to enable this configuration.

In addition, an insulating sheet 130 is interposed between the busbars 120 to prevent a short circuit, and an EMI filter 200 is mounted on the busbars 120 to be configured.

Looking at the configuration of the EMI filter 200, a tubular magnetic body 210 that simultaneously accommodates the circumferences of the bus bar 120 and the insulation sheet 130 and exposes both ends of the bus bar 120 Is composed. The magnetic body 210 is formed of ferrite as an example. In addition, a housing 220 that is an insulator is configured to accommodate the magnetic body 210. As an example, the housing 220 is preferably formed of a synthetic resin material such as polyethylene or polypropylene.

It is a general matter to shield electromagnetic waves by arranging a magnetic material, that is, ferrite around a conductor through which a current flows, and it is obvious that the EMI filter 200 is configured as the above configuration.

As another embodiment of the present invention, a configuration that is easily mounted on the bus bar 120 will be described below with reference to the accompanying drawings.

7 is a perspective view showing another embodiment of an integrated DC link with an EMI filter for an electric vehicle according to the present invention, and FIG. 8 is a cross-sectional view taken along line F-F' of FIG. 7, and FIG. 9 is a shaft in FIG. It will be described together as a cross-sectional view showing a process of accommodating both busbars while the housing is opened by rotation.

The magnetic body 210 is formed in a plate shape and elongated along the length direction of the bus bar 120, and a lower magnetic body 211 having a groove 215 in which the bus bar 120 is accommodated is formed, and the lower portion The upper magnetic body 217 is formed in close contact with the upper surface of the magnetic body 211 and corresponds to the groove 215 so that the groove 219 in which the bus bar 120 is accommodated is formed. Talathe, the grooves 215 and 219 are opened to both sides, respectively, and when the lower magnetic body 211 and the upper magnetic body 217 are matched, the grooves 215 and 219 have a tubular shape opened to both sides.

In addition, looking at the configuration of the housing 220, as the lower magnetic body 211 and the upper magnetic body 217 are accommodated and attached, a C-shaped elastic steel member 221 opened toward the front (DC link side) is configured. , It is preferable that the open side is widened by the external force and formed of spring steel to be restored again when the external force is removed. In addition, an upper plate 223 and a lower plate 225 connected to the upper and lower surfaces of the elastic section steel 221 are configured to apply the external force. Since the lower magnetic body 211 and the upper magnetic body 217 are attached to the inner and upper surfaces of the housing 220, respectively, when the housing 220 is opened, they are separated from each other, and when restored, they are in close contact.

In addition, as covering the elastic section steel 221, the upper plate 223, and the lower plate 225, a shell 227, which is an insulator, is configured, and the elastic section steel 221 is preferably made of a flexible material so that it can be easily opened. However, as an example, it may be formed of urethane or polyvinyl.

In addition, a pipe 230 protruding from the shell 227 to the rear surface of the DC link 100 and having an insertion hole 235 formed therein is configured, and is inserted into the insertion hole 235 to be rotatable and rotated by hand. The shaft 240 is formed with a head 243 at the rear end to be configured. The shaft 240 has an insertion hole 235 through which a string 250 to be described later can pass.

In addition, a string connected to the upper plate 223 through the outer shell 227, through the insertion hole 235 of the shaft 240, and through the outer shell 227 to the lower plate 225 ( 250, string).

Therefore, when the EMI filter 200 is mounted on the bus bar 120, as shown in FIG. 9, when the head 243 of the shaft 240 is held and turned, the string 250 is wound around the shaft 240 The upper plate 223 and the lower plate 225 are pulled rearward. Accordingly, since the open side of the housing 220 is opened, the lower magnetic body 211 and the upper magnetic body 217 are separated from each other. In this state, when the bus bar 120 is inserted between the lower magnetic body 211 and the upper magnetic body 217 and then the head 243 is released, the housing 220 is narrowed in the open side by the restoring force, and the string 250 ) Is released. In addition, while the lower magnetic body 211 and the upper magnetic body 217 are in close contact, the bus bars 120 are positioned in the grooves 219 and 215 on both sides.

According to the EMI filter 200 according to such another embodiment, since the magnetic body 210 and the housing 220 can be easily and quickly mounted on the bus bar 120, assembly is easy. Of course, even when the EMI filter 200 is removed for maintenance purposes, it is possible in the reverse order of the above-mentioned process.

As described above, according to the present application, the conventional DC link has a structure in which the busbar passes through and receives electricity and then outputs it, but in the present application, electricity is supplied with the EMI filter 200 installed by removing the busbar 120 to the outside. It was configured to be. In addition, electricity was output through the output terminal 115 of the DC link 100. Of course, the DC link 100 is configured to perform its original function in a state in which the input terminal 113 and the output terminal 115 are provided separately, and a detailed description thereof is omitted since the structure is a general matter. Therefore, since the conventional DC link has a structure in which the EMI filter is connected while the busbar is mounted, the volume is increased and the capacity is inevitably increased. However, in the present application, since the EMI filter 200 is constituted by the magnetic body 210 surrounding the bus bar 120 in a state in which the bus bar 120 is drawn to the outside, there is an advantage that a compact and lightweight design is possible. Accordingly, there is an advantage in that the volume occupied in the engine room of the electric vehicle can be reduced and the vehicle can be mounted without increasing the weight of the vehicle. In addition, due to the installation of the EMI filter 200, an abnormal sudden oscillation phenomenon due to electromagnetic waves generated from the motor, abnormal screen output of the LCD instrument panel, abnormal control operation of the micom, and other adverse effects of deteriorating the functions of sensitive electronic equipment and the driver's health are adversely affected. Hatches can solve serious problems.

90: DC link with integrated EMI filter for electric vehicles
100: DC link 120: busbar
130: insulation sheet 200: EMI filter
210: magnetic body 211: lower magnetic body
215: groove 217: upper magnetic body
219: groove 220: housing
221: elastic section steel 223: upper plate
225: lower plate 227: shell
230: pipe 235: insertion port
240: shaft 243: head
245: through hole 250: string

Claims (3)

It includes a DC link 100 consisting of two input terminals 113 and two output terminals 115,
Two busbars 120 connected to each of the input terminals 113 to match,
Insulation sheet 130 interposed between the bus bar 120,
Including an EMI filter 200 mounted on the bus bar 120,
The EMI filter 200,
A magnetic body 210 that simultaneously accommodates the circumferences of the bus bar 120 and the insulating sheet 130 and exposes both ends of the bus bar 120,
Including a housing 220 accommodating the magnetic body 210 ,
The magnetic body 210,
A lower magnetic body 211 formed in a plate shape and elongated along the longitudinal direction of the bus bar 120 and having a groove 215 in which the bus bar 120 is accommodated,
It is in close contact with the upper surface of the lower magnetic body 211, and includes an upper magnetic body 217 having a groove 219 in which the bus bar 120 is accommodated because it corresponds to the groove 215,
The housing 220,
The lower magnetic body 211 and the upper magnetic body 217 are accommodated and attached, and a C-shaped elastic section steel 221 that is open toward the front (DC link side),
An upper plate 223 and a lower plate 225 connected to the upper and lower surfaces of the elastic section steel 221,
The elastic steel 221, the upper plate 223, the outer shell 227 which is an insulator as covering the lower plate 225,
A pipe 230 protruding from the outer shell 227 to the rear surface of the DC link 100 and having an insertion hole 235 rearward,
A shaft 240 having a head 243 formed at the rear end thereof so as to be rotatable and rotated by hand by being inserted into the insertion hole 235;
Passing through the outer shell 227 and connected to the upper plate 223 to penetrate the shaft 240, and including a string 250 connected to the lower plate 225 through the outer shell 227 EMI filter integrated DC link for electric vehicles, characterized in that.
The method of claim 1,
The bus bar 120 is disposed in parallel with the DC link 100,
The input terminal 113 is an EMI filter integrated DC link for an electric vehicle, characterized in that disposed on the DC link 100 so as to be connected to the bus bar 120. delete

Images