Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1993-11-19
1995-03-07
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330202, H03F 320
Patent
active
053961943
ABSTRACT:
An audio frequency amplifier having a switching converter comprising source and sink rectifiers configured for sourcing and sinking current, in which the source and sink supply voltages of the rectifiers track the audio frequency signal being amplified. The amplifier has a circuit or element for discharging the output capacitors of the source and sink rectifier as necessary to prevent floating of the source and sink supply voltages. The discharging element can be a locking capacitor or one or more Zener diodes connected across the source and sink supply voltages. The discharge circuit can be one or more switching transistors connected across the freewheeling diodes of the source and sink rectifiers to actively pull the source and sink voltages down to discharge the output capacitors and thereby prevent floating. Low voltage rated parts can be used in the output stage amplifier, and in certain configurations a high voltage low current preamplifier stage can be eliminated.
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Croft, III James J.
Williamson Robert C.
Carver Corporation
Mullins James B.
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