Thermal protection of amplifiers

Details Thermal protection of amplifiers Thermal protection of amplifiers

1977-12-01

1979-04-10

Dahl, Lawrence J.

Amplifiers

With semiconductor amplifying device

Including protection means

330143, 330207P, 361105, H03F 2100

Patent

active

041491246

ABSTRACT:
A method and circuit for protecting the output stage of an amplifier from thermal overload. A normally-open, temperature sensitive switch is thermally coupled to the transistors in the output stage and electrically connected across a portion of the feedback resistance element of the amplifier, in one circuit embodiment. Whenever the temperature of the transistors reaches a predetermined threshold level, the switch closes and acts as a low resistance path across that portion of the feedback resistance element, thereby reducing the gain of the amplifier to a safe level which is zero in the preferred embodiment. Thereafter, when the temperature decreases below the predetermined threshold level, the switch automatically opens to restore normal operation of the amplifier.

REFERENCES:
patent: 2331530 (1943-10-01), Zinn
patent: 2866017 (1958-12-01), Jones, Jr.
patent: 3480835 (1969-11-01), Richman
patent: 3541457 (1970-11-01), Leighty et al.
patent: 3588729 (1971-06-01), Satterfield

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