KR950011615B1 - Cable connection assembly with emi filter - Google Patents

Abstract

A cable connecting assembly equipped with an EMI filter includes: a housing; a multi point connector which has multiple electrically conductive pins which are surrounded by the housing, has an exposed surface to outside and is extended to the inner of the housing; an EMI filter for eliminating high frequency electric interference; a connecting means for connecting the electrically conductive pins and the EMI filter; and a wiring block which connects the EMI filter and an electric cable and locates in the housing.

Description

Cable connection assembly with EMI filter

1 shows an exploded view of a cable connection assembly equipped with an EMI filter.

Figure 2a shows a view from above of the inside of the cable connection assembly equipped with an EMI filter.

FIG. 2B is a cross-sectional view taken along line A-A 'of FIG. 2A of the cable assembly for mounting an EMI filter.

3 is a diagram illustrating a connection between an EMI filter and a second PCB substrate.

* Explanation of symbols for main parts of the drawings

10 housing 12 upper body

14: lower body 16: connector

18: electroconductive pin 20: EMI filter

22: IPCB substrate 24: second PCB substrate

26: cable 28: wiring block

The present invention relates to a cable connection assembly equipped with an electromagnetic interference interference filter (hereinafter referred to as an "EMI filter") that reduces electromagnetic interference as a cable connection assembly for connecting an electronic device. The present invention relates to a communication cable provided with an integrated EMI filter to reduce electromagnetic interference inside a housing.

Connectors for attenuating high frequency interference from electronic devices are known from a number of patent documents, for example, US Pat. Nos. 3,558,464, 4,124,684 and 4,187,481. Each of these patent documents consists of a series of ceramic layers formed of a monolithic structure with a capacitor used with a filter. Thick film capacitors are also known from US Pat. No. 4,274,124. Although monolithic capacitors are used in current filter connectors, it has not been practical to use thick film capacitors as described in US Pat. No. 4,274,124 above instead of these monolithic capacitors. This is sufficient to attenuate high frequencies to be used in pulverizers. Each of these patent documents consists of a series of ceramic layers formed in a monolithic structure with a capacitor used with a filter. Thick film capacitors are also known from US Pat. No. 4,274,124. Although monolithic capacitors are used in current filter connectors, it has not been practical to use thick film capacitors as described in US Pat. No. 4,274,124 in place of these monolithic capacitors. This is because many problems have arisen in designing thick film capacitors with inductance low enough to be used in filter connectors to attenuate high frequencies.

Methods or apparatuses for reducing the signal output of such disturbing waves are known in the literature, including filters using ferrite sleeves (see US Pat. No. 4,144,509), or filters using monolithic capacitor structures with or without ferrite (US Pat. 3,538,464).

However, these devices are too expensive for cheap electronics such as personal computers. Therefore, a cheap filter capable of satisfactorily attenuating electromagnetic signals having frequencies of up to 1,000 MHz is required. Commercially available filters attenuate electromagnetic signals at 1,00 MHz frequency by 30 decibels (dB).

Often, multi-conductor cables are needed for several communications devices or other such types of cables. For this purpose it is often necessary to arrange and electrically connect a pair of multi-contact connectors, then connect them to the accepted multi-conductor cable. Connect it. Contacts of this type are well known in the industry and are known in US Pat. No. 4,398,780. This patent describes shielded electrical connectors for use in telecommunications cables, etc., which have a metallic sheath that has been touched by a metal foil or metal strip to shield the conductor from interference from electromagnetic interference. Leads can be achieved by stripping and exposing the cable ends to terminate the connectors, and the connector housings made of a metal shell on the housing housing the connectors.

However, in order for the above products to function properly, each wire of the cable must be placed on the appropriate terminal of the connector and terminated there. This is a very laborious task.

Accordingly, an object of the present invention is to create a "piggyback shielded cable assembly" of the shape (loading), but provides an assembly for the cable connection with the EMI filter that can be quickly produced by reducing the labor required for manufacturing It is.

The purpose is a multi-contact connector comprising a housing, a plurality of electrically conductive pins extending through the surface from outside to the interior of the housing, the housing being surrounded by the housing and exposed to the outside; And an EMI filter including a EMI filter for removing high frequency electromagnetic interference, a connecting means for connecting the electroconductive pin and the EMI filter, and a wiring block connecting the EMI filter and the electrical cable and positioned in the housing. It is achieved by the installed cable assembly.

EMI filter for removing high frequency electromagnetic interference used in the present invention is an integrated form having a terminal arranged in two rows, this type of EMI filter is a Korean patent application filed and filed by one of the applicant of the present invention EMI filters of the type shown in 92-4678 can be applied to produce the products of the present invention.

In the present invention, the EMI filter for removing high frequency electromagnetic interference is directly connected to the cable to suppress the transmission of unnecessary high frequency to the cable or to suppress the reflected wave reflected from the load, such transmission suppression of the unwanted frequency and the reflected wave from the load This is described in Korean Patent Application No. 92-19984, which was invented and filed by one of the applicants of this invention.

Referring to this application, a communication cable including a plurality of signal transmission lines includes at least three signal transmission lines, each of which is connected to a high frequency cut-off filter having capacitance elements connected in parallel and connected to a ground line. The connection point of the capacitance element of each of these high frequency cut-off filters and a ground line has a structure which forms a common connection point.

Therefore, unwanted harmonics among the signals applied to each line are interrupted by an inductor inserted in series in a line showing a high impedance component with respect to the AC component, bypassed by a capacitor connected in parallel with the load, and at a constant frequency. Only signals whose components are attenuated are transmitted to the monitor.

At this time, since the connection points of each of the capacitance elements of the filter and each of the ground lines, which are connected in parallel between the ground lines corresponding to the respective lines, are the common connection points, they are equivalently grounded over one capacitor. This prevents mutual inductive coupling from occurring and prevents inductance from fluctuating every time a signal is transmitted.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 1, the assembly for cabling connecting the EMI filter includes a housing 10 including an upper body 12 and a lower body 14. The housing 10 is configured so as to surround the connector 16 whose one surface is exposed to the outside, the connector 16 penetrating the surface of the connector 16 from the outside of the housing 10. And a plurality of electrically conductive pins 18 extending therein. The EMI expander 20 is mounted inside the housing 10. The EMI filter 20 is connected to the conductive pins by the first PCB 22 and the second PCB 24 constituting the connecting means. 18). The substrate surface of the first PCB substrate 22 has holes in the first group corresponding to the shape of the plurality of pins 18 penetrating the surface of the connector 16 and extending from the outside into the housing 17. The second group of holes for the electrical connection with the second PCB substrate 24 is drilled. In the drawing, a plurality of pins 18 penetrating the surface of the connector 16 and extending from the outside into the housing 10 are provided. The first group of holes in three rows and the second group of holes in one row for electrical connection with the second PCB substrate 24 are shown.

A method of assembling an assembly for cable connection with an EMI filter having such a structure will be described in detail as follows.

The connector 16 is inserted into the opening of the lower body 14 of the assembly housing 10 for cable connection so that one surface thereof is exposed to the outside, and the connector 16 penetrates the surface of the connector 16 from the outside. And a plurality of electroconductive pins 18 extending into the housing 10, the conductive pins 18 being drilled in a shape corresponding to the shape of the pins on the substrate surface of the first PCB substrate 22. It is inserted into the holes of the first group and electrically connected to the PCB substrate by a method such as soldering or the like.

In the holes of the second group of the first PCB board 22, a conductor lamp electrically connected to the second PCB board 24 is inserted, and the first PCB board 22 and the second PCB board 24 are electrically connected by a method such as soldering. Is connected.

Terminals in one row of the two rows of terminals of the EMI filter are inserted into the second PCB substrate 24 and electrically connected thereto. The remaining one row of the EMI filter is fitted into a wiring block 38 located in the housing 10, which is connected to an electrical cable electrically connected by a conventional method.

Finally, by combining the upper body 12 and the lower body 14 of the housing 10, the assembly for cable connection with the EMI filter is completed.

In the present invention, the housing 10 may be made of a conductive material, for example, a metal or a conductive plastic. The conductive material may be more effective in preventing radiation of unwanted electromagnetic waves.

Therefore, the present invention can effectively mount the electromagnetic wave shielding filter to the cable connection assembly can provide a cable that can prevent the radiation of unwanted harmonics at low cost.

Claims (4)

A multi-contact connector comprising a housing, a plurality of electrically conductive pins extending through the surface from the outside to the interior of the housing, the housing being surrounded by the housing and exposed to the outside; Cable installed with an EMI filter including an EMI filter for removing obstacles, connecting means for connecting the electrically conductive pins and the EMI filter, and a wiring block connecting the EMI filter and the electric cable and located in the housing Connection assembly. The assembly of claim 1, wherein the housing is provided with an EMI filter shielded with a conductive material. The assembly of claim 1 or 2, wherein the connection means is a PCB substrate. The assembly of claim 3, wherein the PCB board is provided with an EHI filter separated into a first PCB board and a second PCB board.