Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1978-12-29
1980-09-23
Moose, Jr., Harry E.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361190, H01F 2742
Patent
active
042246547
ABSTRACT:
A relay driver circuit is disclosed in which a relay coil is operated by enabling the collector-emitter path of a switching transistor. In order to avoid damage to the transistor from voltages induced in the relay coil when the relay is turned off, an isolating semiconductor device is inserted between the transistor and the relay coil. This semiconductor device is operated in synchronism with the driving transistor and thus isolates the driving transistor from transients during the de-energization of the relay.
REFERENCES:
patent: 3268776 (1966-08-01), Reed
patent: 3646402 (1972-02-01), Condon et al.
GE SCR Manual .RTM. 1967, p. 7.
Goldthorp David C.
Tuhy, Jr. Frank P.
Bell Telephone Laboratories Incorporated
Moose Jr. Harry E.
Nimtz Robert O.
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