Amplifiers – With semiconductor amplifying device – Including push-pull amplifier
Patent
1996-05-17
1998-10-06
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including push-pull amplifier
330267, 330289, 330297, 330298, H03F 130, H03F 1152
Patent
active
058183019
ABSTRACT:
A power amplifier arrangement for amplifying audio signals to be applied to a number of speakers has a plurality of power amplifiers. A level detector detects a level of a peak value of outputs from the power amplifiers, and produces a control signal when the positive peak value exceeds a predetermined positive level. Two power sources are provided for providing a high voltage power and low voltage power to the speakers. A power transistor turns on in response to the presence of the control signal to provide the high voltage power to the speaker, but turns off in response to the absence of the control signal to provide the low voltage power to the speaker. A temperature detector detects a temperature of the power transistor and produces a disabling signal when the detected temperature is greater than a predetermined temperature to disable the power transistor by switching transistor.
REFERENCES:
patent: 4423389 (1983-12-01), Fushiki
patent: 5543998 (1996-08-01), Higashiyama et al.
English Language Abstract of JP 2-47882, Aug. 1983.
English Language Abstract of JP 3-201710 Sep, 1991.
Higashiyama Katsuhiko
Hori Fumio
Kumaki Seiji
Matsushita Electric - Industrial Co., Ltd.
Mullins James B.
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