Power limiting audio amplifier temperature protection circuit

Details Power limiting audio amplifier temperature protection circuit Power limiting audio amplifier temperature protection circuit

1987-05-22

1988-05-03

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including protection means

330146, 330207P, 361 91, 361 98, H03F 152, H02H 720

Patent

active

047423129

ABSTRACT:
An audio amplifier of the type including circuitry to detect clipping and adjust the gain of an amplifier input element to control the clipping in closed loop operation further includes circuitry effective to sense the temperature of an amplifier component and change the amplifier bias voltage that determines the maximum non-clipping voltage so as to induce clipping in the amplifier when the temperature exceeds a predetermined temperature. The clipping control circuitry then reduces the input gain to the amplifier to control the clipping and, in so doing, reduces power dissipation to a level allowing the temperature to decrease to the predetermined temperature. The circuit provides for closed loop control of amplifier temperature in marginal temperature situations with minimal intrusion on the music reproduction process.

REFERENCES:
patent: 4053996 (1977-10-01), Schertz
patent: 4158180 (1979-06-01), Challen
patent: 4345218 (1982-08-01), Congdon et al.
patent: 4530026 (1985-07-01), Noro

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