Protective circuit for transistor amplifier

Details Protective circuit for transistor amplifier Protective circuit for transistor amplifier

1974-07-08

1976-01-27

Shoop, William M.

Electricity: power supply or regulation systems

Remote sensing

317 33VR, 317 36TD, 317 33R, 317 41, 323 20, 330207P, H02H 720

Patent

active

039355136

ABSTRACT:
A protective circuit for a transistor amplifier is disclosed which includes a load impedance detecting circuit provided between an output terminal of a transistor amplifier and a load terminal, a circuit for detecting an abrupt surge voltage of a voltage source for the amplifier and a muting circuit are provided between an input terminal of the amplifier and a reference point, the muting circuit being operative to limit an input signal applied to the input terminal of the amplifier in response to output signals of the load impedance detecting circuit. A protective circuit having a thermal sensing circuit for detecting a temperature rise of an output transistor above a predetermined level which shuts off the amplifier is described as one embodiment.

REFERENCES:
patent: 3493878 (1970-02-01), Fautale
patent: 3522480 (1970-08-01), Routh et al.
patent: 3555358 (1971-01-01), Gibbs
patent: 3646397 (1972-02-01), Ruthenberg et al.
patent: 3681659 (1972-08-01), Suzuki
patent: 3703679 (1972-11-01), Heidt
patent: 3731153 (1973-05-01), Nishimoto
patent: 3792313 (1974-02-01), Conrad
patent: 3794858 (1974-02-01), Squiers

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