Electric circuit unit

Details Electric circuit unit Electric circuit unit

1989-10-05

1990-10-30

Tolin, Gerald P.

Electricity: electrical systems and devices

Miscellaneous

174 51, 174261, 333185, H05K 900

Patent

active

049673165

ABSTRACT:
An electrical circuit unit, particularly for motor vehicles, features a grounded housing (1) and a printed circuit board (2) which, for protection against incoming and outgoing radiation of electrical noise, is short-circuited at high frequencies to the grounded housing. For this purpose, a noise suppression capacitor (6) on the PC board (2) is connected in series to a second capacitor. This second capacitor is formed by a metallized surface (8) on the board (2) and a metal-filled adhesive, as a first plate, a metal inner surface (11) of the housing (1) as a second plate, and an intermediate passivation or eloxal layer serving as a dielectric (13). The metal-filled adhesive acts to electrically bridge most of the gap between the metallized surface (8) and the housing surface (11), thereby capacitively coupling the metal-filled adhesive to the housing (1) and increasing the capacitance.

REFERENCES:
patent: 4258411 (1981-03-01), Sherman
patent: 4641224 (1987-02-01), Reimer
patent: 4675784 (1987-06-01), Dahlberg
patent: 4729809 (1988-03-01), Dery
patent: 4747019 (1988-05-01), Ito
patent: 4791391 (1988-12-01), Linnell
patent: 4795991 (1989-01-01), Saito
patent: 4861941 (1989-08-01), Kubo
patent: 4912604 (1990-03-01), Vaisanen

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