Overload protection circuit

Details Overload protection circuit Overload protection circuit

1975-03-10

1976-03-23

Miller, J. D.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

317 33R, 317 33SC, 317 27R, 330207P, 331 62, 307202R, H02H 720

Patent

active

039462803

ABSTRACT:
This invention refers to an overload protection circuit for an oscillatory circuit driving an electro-acoustic converter and more specifically concerns a circuit for automatically inhibiting the oscillatory circuit in the presence of an overload. The overload protection circuit monitors the collector-emitter voltage signal and the base-emitter voltage signal for providing an overlap signal responsive to the interval when both mentioned voltage signals are in their high condition. Such a condition is indicative of the power dissipated in a switching transistor of the oscillatory circuit. The overlap signal is integrated and the integrated signal is compared to a predetermined voltage level. When the integrated signal exceeds the predetermined voltage level, the oscillatory circuit is inhibited.

REFERENCES:
patent: 3432691 (1969-03-01), Shoh
patent: 3519884 (1970-07-01), Paddison et al.
patent: 3577035 (1971-05-01), Constable
patent: 3835412 (1974-09-01), Honda et al.
patent: 3898559 (1975-08-01), Westra

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