Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1989-07-14
1991-08-06
Miller, Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307318, 3072964, 361 91, H03K 326, H02H 720
Patent
active
050380540
ABSTRACT:
A protected Darlington transistor arrangement comprising: first (2) and second (4) bipolar transistors each having a base, a collector and an emitter, the base of the first transistor being coupled to the base (B) of the Darlington transistor, the collectors of the first and second transistors being coupled to the collector (C) of the Darlington transistor, the emitter of the first transistor being coupled to the base of the second transistor, and the emitter of the second transistor being coupled to the emitter (E) of the Darlington transistor; and a third bipolar transistor (6) having a base, a collector coupled to the collector of the Darlington transistor, and an emitter, wherein the Darlington transistor arrangement further comprises: a Zener diode (8) coupled between the collector of the Darlington transistor and the base of the third transistor, the base of the third transistor being coupled to the emitter of the second transistor, and the emitter of the third transistor being coupled to the base of the second transistor.
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Bairanzade Michael
Lance Philippe
Peyre Lavigne Andre
Cunningham Terry D.
Handy Robert M.
Miller Stanley D.
Motorola Inc.
Parsons Eugene A.
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