Supply circuit for electromagnetic relays

Details Supply circuit for electromagnetic relays Supply circuit for electromagnetic relays

1993-03-23

1995-03-28

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361152, H01H 4700

Patent

active

054023025

ABSTRACT:
An electromagnetic relay, which may be associated with further relays, has a supply circuit which includes means for generating a holding voltage for holding the relay contacts closed. This voltage generating means is activated and de-activated by receipt of an appropriate command signal for respectively closing and opening the relay contacts. The supply circuit includes a chopping circuit for chopping the highest unidirectional voltage available on the circuit, according to a cyclic ratio which is predetermined so as to provide a holding condition for the relay contacts at an intermediate voltage lower than the said highest available voltage, and with a low current. It also includes a circuit for generating a controlled closing voltage during the transition from the open to the closed position of the relay contacts. The invention is applicable especially to batteries of relays for use in motor vehicles.

REFERENCES:
patent: 4180026 (1979-12-01), Schulzke et al.
patent: 4688139 (1987-08-01), Nagata et al.
patent: 4989116 (1991-01-01), Gruner et al.
patent: 5053911 (1991-10-01), Kopec et al.
patent: 5107391 (1992-04-01), Siepmann
IBM Technical Disclosure Bulletin; vol. 27, No. 2, Jul. 1984, pp. 1057-1058, Renz et al.

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