Power amplifier circuit for audio signal and audio device using

Details Power amplifier circuit for audio signal and audio device using Power amplifier circuit for audio signal and audio device using

1994-09-26

1996-01-09

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including push-pull amplifier

330146, 330297, H03F 330

Patent

active

054831970

ABSTRACT:
The present invention includes a first amplifier, a second amplifier, a switching circuit for switching power from a power source line at a frequency exceeding an audible frequency and feeding the first or second amplifier, a control circuit for controlling a switching period of the switching circuit such that the feeding power is changed correspondingly to a level of the audio signal correspondingly to a first difference in voltage between one of the audio signal and the audio signal amplified by the amplifier and the power or a second difference in voltage between one of the audio signal and the audio signal amplified by the second amplifier and the feeding power, a smoothing circuit for smoothing a power fed by said switching circuit and a capacitor adapted to be charged by a portion of current flowing from said smoothing circuit when the switching circuit is in OFF state and generating discharge current to be added to the output of one of the first and second output stage amplifiers when the switching circuit is in ON state, a loud speaker being driven by outputs of the first and second amplifiers.

REFERENCES:
patent: 4752747 (1988-06-01), Botti et al.
patent: 5396194 (1995-03-01), Williamson et al.

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