Power amplifier apparatus having over-current protection functio

Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier

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Details

330207P, 330298, H03F 2100, H03F 318

Patent

active

042873908

ABSTRACT:
A power amplifier having first and second amplifiers each including an output stage consisting of series connections of collector-emitter paths of first and second output transistors connected between power supply terminals is disclosed. Each first and second transistor is driven alternately in response to an input signal fed through an input terminal, and each output transistor is provided with an over-current detector circuit. Protective circuits are responsive to the detection outputs of the detector circuits to protect the corresponding output transistors. The output terminals of the power amplifier are respectively connected to the common junction of the first and second output transistors of the first and second amplifiers, and a load such as a speaker is connected between the output terminals. Circuits are provided to apply the outputs of the over-current detector circuits in one amplifier to the corresponding protective circuits in the other amplifier, and vice versa.

REFERENCES:
patent: 3376388 (1968-04-01), Reiffin
patent: 3448395 (1969-06-01), Webb
patent: 3486124 (1969-12-01), Eisenberg
patent: 3988693 (1976-10-01), Seki

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