JPH0582212A - Connector strip used for electronic controller for automobile - Google Patents

Abstract

PURPOSE: To shield a connector strip used in an electronic control device for an automobile from electromagnetic interference in a sure, simple and economical manner. CONSTITUTION: A printed circuit board 22 housing at least part of a connector pin 16 is fit to a connector strip 11, and the printed wiring board 22 has at least one circular conductor path 28 in an edge range 17. At least one chip capacitor 29 is fixed to the printed wiring board 22 by adhesion, and electrical connection between the conductor path 28 and a shield thin plate 21, and that between each chip capacitor 29 and either one of the conductor path 28 and the connector pin 16 are formed by brazing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector strip for use in an electronic control unit for an automobile, comprising a plurality of connector pins, a shield thin plate partially surrounding the connector strip, and at least one component of capacitive type. And the component is electrically connected to the connector pin and the shield thin plate.

[0002]

BACKGROUND OF THE INVENTION Electronic control systems often require that certain structural units be shielded from electrical and magnetic interference effects. For example, the digital circuits provided in the control device generate high-frequency impulses due to the steep switching edges and interfere with other appliances, for example mobile communication appliances such as radios, radios and mobile telephones. Effective precautionary measures must be taken against such electromagnetic disturbances.

A connector strip is known as a constituent unit which is desired to be protected from such interference. The connector strip is provided with a shield lamella so that the connection of the electronic control unit with the connector strip is protected from space-restricted electromagnetic influences.

Furthermore, in order to obtain a fault-free operation of the electronic control unit, the conduit leading to said connector strip of the plug-in contact connection device to which the connector strip belongs may, for example, from an ignition device of a motor vehicle. It is necessary to free it from the interfering effects that occur. For this purpose, it is advantageous to use ground capacitors in the form of feedthrough capacitors. This feedthrough capacitor is connected on the one hand to the connector pins of the connector strip and on the other hand to a shield lamella electrically connected to ground potential, which leads to the decoupling of high-frequency disturbances confined to the output. It

The feedthrough capacitors are joined by reflow brazing to the connector pins on the one hand and to the shield lamellas of the connector strip on the other hand. In this case, first
The viscous brazing paste is applied individually to the connecting lugs of the connector strip, after which the feedthrough capacitors are manually slipped over the connecting lugs of the connector strip and subsequently the brazing paste is melted, for example by heating with UV light. Such a manufacturing method is costly and uneconomical for mass production.

Further, the feedthrough capacitor has tensile tension,
Being extremely sensitive to compressive and bending tensions, the feedthrough capacitors are subject to mechanical tension when the thermal expansion characteristics of the connector pin and the shield lamella coupled to this feedthrough capacitor are different. Such tension forces are combined with the vibration effects that occur on the vehicle during severe driving, increasing the failure rate. Further, since the feedthrough capacitor is extremely difficult to replace when damaged, such a device interference prevention means is not satisfactory.

[0007]

SUMMARY OF THE INVENTION It is an object of the invention to improve a connector strip of the type mentioned at the beginning such that it is shielded against electromagnetic interference in a reliable, simple and economically advantageous manner. It is to provide such a connector strip.

[0008]

In order to solve this problem, in the structure of the present invention, a printed wiring board for accommodating at least a part of the connector pins is fitted in the connector strip, and the printed wiring board has an edge. The region has at least one annular conductor track, at least one capacitive-type component is fixed to the printed wiring board by gluing, and an electrical connection between the conductor track and the shield lamella. And an electrical connection between each capacitive component, the conductor track and one of the connector pins,
It was formed by the brazing method.

[0009]

The connector strip according to the invention has the advantage over the prior art that a particularly simple and inexpensive device jamming prevention means is obtained. Such a device interference prevention means allows a simple assembly and disassembly of the capacitor and a high-frequency technically reliable solution which increases the reliability compared to the known prior art. For this,
A printed wiring board can be inserted into the connector strip, which in the form of a chip capacitor with surface-mounted capacitive components can be pre-assembled by an adhesive in an automatable manner. .. Since the chip capacitor has a smaller mass than the feedthrough capacitor, it is less sensitive than the feedthrough capacitor to excitations such as those produced by an internal combustion engine of a motor vehicle, and is therefore mechanically stable. Moreover, a defective chip capacitor can be easily replaced.
Chip capacitors are cheaper than feedthrough capacitors,
The capacitance value of the chip capacitor can be variously set, which allows the chip capacitor to be adapted to various signal and voltage formats.

The anti-jamming printed wiring board can be manufactured in multiple panels. That is, a plurality of anti-jamming printed wiring boards that are still bonded are manufactured simultaneously in a composite. In this case, the interference prevention printed wiring board is brazed to the chip capacitor in one working step in the reflow brazing method. Thereafter, the anti-jamming printed wiring board is singulated and fitted into the connector strip. The joining of the annular conductor track to the shield lamella and the joining of the brazing eyes of the anti-jamming printed wiring board to the connector pins can then be carried out by the wave brazing method or the dip brazing method.

The annular conductor track provided in the edge region of the printed wiring board forms a closed connection with the shield foil.

This makes it possible, by means of the inventive design of the connector strip inserted in the electronic control unit, to provide an electronic control unit with an economically advantageous formable and functionally reliable device jamming prevention means. ..

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

In the illustrated embodiment, the connector strip 1
1 is shown and this connector strip is part of an electronic control unit 12 which is shown only schematically. The connecting means of this electronic control device leads to another electrical device of the motor vehicle.

FIG. 1 shows at 13 a base body made of plastic for the connector strip 11. This base body has a housing 14 on the front side thereof for housing a corresponding connector (not shown).

A large number of metallic connector pins 16 are embedded in the base body 13. In this case, the connector pins 16 arranged in three rows have their insertion sections 17
Then, it is projected into the housing 14 for the corresponding connector.
The other end range of each connector pin 16 is the base body 13
Configured as a connection lug 18 protruding from the. This connecting lug tapers towards its end and becomes a pin 19
Is formed. The pins 19 can be used for connection to corresponding conductor tracks (not shown) of the plate with electronic components.

A thin shield plate 21 and a printed wiring board 22 are structurally connected to the connector strip 11.

The printed wiring board 22 has a hole pattern as the brazing eye 20. Since this hole pattern corresponds to the arrangement form of the connector pins 16 in the connector strip 11, the printed wiring board 22 is provided on the back side 23 of the base body 13 opposite to the accommodation body 14. It can be fitted over the connecting lug 18 via the pin 19 until it comes into contact.

A flange 24 is formed between the container 14 and the back side 23, and the flange 24 is oriented radially from the container 14 and projects on both sides. The flange 24 is surrounded by a shield lamella 21, the restriction of which extends on the one hand above an axially extending outer peripheral surface 26 of the housing 14 and, on the other hand, a print which is fitted over the connecting lug 18. It protrudes even under the edge area 27 of the wiring board 22.

The edge area 27 of the printed wiring board 22 has an annular conductor track 28. The conductor tracks are shown exaggerated for clarity. This conductor track is in direct contact with the thin shield plate 21. Shield thin plate 21
Is electrically connected to the ground potential of the electronic control unit 12 by a plurality of connection pins 37 of the shield thin plate 21 and shields the connector strip 11 against electromagnetic influences confined in space.

The printed wiring board 22 has connector pins 16
A chip capacitor 29 is provided for the purpose of shielding against electric and magnetic interference effects that take a track constrained by a line. Each chip capacitor 29 may be electrically connected to the connector pin 16 on the one hand and to ground potential on the other hand.

The chip capacitor 29 is a component mounted on the surface of the printed wiring board 22. Such an assembling format is called SMD (surface mounted devices) technology. The chip capacitor 29 is attached to the printed wiring board 22 by an adhesive method or a reflow soldering method.

The exact placement of the individual chip capacitors 29 on the printed wiring board 22 is shown in FIG. In FIG. 2, an annular conductor track 28 covering the edge area 27,
Connection lugs 18 passing through the individual brazing eyes 20, a first coupling path 31 and a second coupling path 33 are shown. The first connecting path 31 leads from the first connecting space 32 to the brazing eye 20, and the second connecting path 33 leads to the second connecting path 33.
From the connection space 34 to the conductor path 28. The chip capacitor 29 has a connection cap 36 that is attached to the end side and forms both electrodes of the chip capacitor 29.
It is also bonded to the printed wiring board 22. In this case, each connection space 32, 34 is covered with one connection cap 36. The chip capacitor may already be fixed in advance by a reflow brazing method when the printed wiring board 22 is mass-produced. Both coupling paths 3
1, 33 are designed to ensure a low inductive connection with the lowest possible resistance.

Such a printed wiring board 22 with the shield lamella 21 in contact with the conductor track 28 is brazed by wave brazing or dip brazing in a single working step, whereby the conductor track 28 and the shield lamella are made. 21 and each chip capacitor 29 with a mechanically stable conductive connection to it and an associated connector pin 16
And a mechanically stable conductive connection between the conductor track 28 and the conductor track 28.

Due to the fact that the printed wiring board 22 and the shield lamina 21 are arranged directly on the base body 13 of the connector strip 11, this connector strip is totally protected from magnetic and electrical disturbance influences.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a connector strip according to the present invention.

FIG. 2 is a plan view showing a part of a printed wiring board.

[Explanation of symbols]

11 connector strips, 12 electronic control units,
13 base body, 14 housing, 16 connector pin, 17 insertion section, 18 connection lug, 19
Pin, 20 brazing eye, 21 shield thin plate,
22 printed wiring board, 23 back side, 24 flange, 26 outer peripheral surface, 27 edge range, 28 conductor path, 29 chip capacitor, 31 coupling path, 3
2 connection spaces, 33 coupling paths, 34 connection spaces, 36 connection caps, 37 connection pins

Front Page Continuation (72) Inventor Michael Einen Felt Germany Federal Republic of Alto Douween Sittette Patz Pervück 16

Claims (6)

[Claims] 1. A connector strip for use in an electronic control unit of an automobile, comprising a plurality of connector pins, a shield thin plate partially surrounding the connector strip, and at least one component of capacitive type. A printed wiring board (22) in which at least a part of the connector pins (16) is accommodated in the connector strip (11) in a type in which the constituent elements are electrically connected to the connector pins and the shield thin plate The printed wiring board (22) has at least one annular conductor track (28) in the edge region (27) and at least one component (29) of the capacitive type.
Are fixed to the printed wiring board (22) by adhesion, and the electrical connection between the conductor path (28) and the shield thin plate (21) and each capacitive type component (2).
9), the conductor path (28), and the connector pin (16)
A connector strip for use in an electronic control unit of a vehicle, characterized in that the electrical connection with one of them is made by a brazing method. 2. The connector strip according to claim 1, wherein the capacitive component (29) is a surface-mounted chip capacitor (29). 3. Each one provided on a connector pin (16)
One connecting lug (18) is the printed wiring board (22).
Is electrically conductively housed in a brazing eye (20) provided in the said brazing eye (20), and each said brazing eye (20) is conductively connected to said conductor path (28) by series connection with said chip capacitor (29). The connector strip according to claim 1 or 2, wherein: 4. The connector strip according to claim 1, wherein the printed wiring board (22) is rigidly constructed. 5. The connector strip according to claim 1, wherein the printed wiring board (22) is flexible. 6. The connector strip according to claim 1, wherein the printed wiring board (22) is rigid and flexible.