Amplifiers – With semiconductor amplifying device – Including protection means
Patent
1977-12-20
1979-06-05
Dahl, Lawrence J.
Amplifiers
With semiconductor amplifying device
Including protection means
330143, 330207P, 330289, 330307, 361 96, 361 97, H03F 304
Patent
active
041575130
ABSTRACT:
A power transistor in the final stage of an IC amplifier feeding a reactive load, such as a loudspeaker, has an emitter resistor connected across the input of a monitoring transistor by way of a diode, the monitoring transistor being part of a protective circuit which reduces the input signal to the power amplifier in the event of an overload. To retard the response of the protective circuit, for the purpose of preventing signal distortions in the event of brief power surges, the diode and the monitoring transistor are so disposed on the silicon chip of the amplifier that a thermal wave from the overheating power transistor will first strike the diode, thereby reducing its resistance to compensate for an increased voltage drop across the emitter resistor, and will reach the monitoring transistor with a certain delay; if the overload persists, the resulting increase in the conductivity of the monitoring transistor re-establishes the full sensitivity of the protective circuit.
REFERENCES:
patent: 3258606 (1966-06-01), Meadows
patent: 3393328 (1968-07-01), Meadows et al.
patent: 3792316 (1974-02-01), Bondini et al.
patent: 3809928 (1974-05-01), Evans
patent: 4074334 (1978-02-01), D'Arrigo et al.
Ghiringhelli Giovanni
Murari Bruno
Dahl Lawrence J.
Ross Karl F.
SGS-ATES Componenti Elettronici S.p.A.
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