Power amplifier protection circuit

Details Power amplifier protection circuit Power amplifier protection circuit

1982-05-13

1983-11-22

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

330207P, 330298, 361 88, H02H 326, H03F 304

Patent

active

044172923

ABSTRACT:
A protective current mirror, with a reflection ratio greater than one, is connected as the active load of an input differential amplifier of a power amplifier. This mirror is provided in addition to the usual current mirror which has its output connected to the drive transistor of the output power amplifier stage. The protective mirror senses the imbalance due to a voltage peak which occurs at an inverted input of the input differential amplifier at the very beginning of the descending portion of a sawtooth input signal ramp voltage and the protective mirror operates a protective transistor which is connected to the base of the power amplifier drive transistor so as to keep one power transistor of the final power amplifier stage in its inactive state. Protection of the output power transistor occurs before the output of the power amplifier has reached its maximum voltage level.

REFERENCES:
patent: 3845405 (1974-10-01), Leidich
A. Romano et al., A monolithic Integrated Circuit for Vertical Deflection in Television Receivers, Transactions CE, Feb. 1975, pp. 85-93.

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