Short circuit and overload protection circuit for output stage t

Details Short circuit and overload protection circuit for output stage t Short circuit and overload protection circuit for output stage t

1985-03-11

1987-09-22

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 86, 361 91, 361101, H02H 308, H02H 902

Patent

active

046959157

ABSTRACT:
The invention relates to a short circuit and overload protection circuit for output stage transistors based on the principle of power monitoring. The gist of the invention is that the collector emitter voltage of a power output stage transistor is detected by a limitation and threshold value network and a protective transistor whose collector drives the base of the driving transistor of the output stage and protects the latter from overload. The output stage transistor is driven in timed sequence or continuous operation. By a variation of the base current of the output stage transistor via a change in its base resistance, the response threshold of the protection device may be influenced within a large range.

REFERENCES:
patent: 3182246 (1965-05-01), Lloyd
patent: 3366871 (1968-01-01), Conner
patent: 3748569 (1973-07-01), Frank et al.
Arthur R. Bailey, Wireless World, "Output Transistor Protection in A.F. Amplifiers," (1968), pp. 154-156.

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