Output transistor protection circuit in a power amplifier with c

Details Output transistor protection circuit in a power amplifier with c Output transistor protection circuit in a power amplifier with c

1983-04-11

1985-07-16

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 79, 361 86, 330207P, 330298, H02H 720, H03F 304

Patent

active

045300267

ABSTRACT:
An output transistor protection circuit in a power amplifier comprises a limiter circuit which limits a collector power dissipation of the output transistors to a predetermined magnitude in accordance with an output voltage level of the amplifier and a current level of the output transistors. For sure limitation operation with a low cost construction, and without destruction of signal waveform, limitation characteristics of the limiter circuit is varied in accordance with detection results of an output voltage level detection circuit which detects whether the output voltage level is smaller than a predetermined magnitude, and a clipping condition detection circuit which detects whether an output stage of the amplifier is clipped.

REFERENCES:
patent: 3681659 (1972-08-01), Suzuki
patent: 3946280 (1976-03-01), Quist
patent: 4173739 (1979-11-01), Yoshida

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