Programmably configured switchmode audio amplifier
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United States of America Patent
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Jan 10, 2017
Grant Date -
Jul 10, 2014
app pub date -
Feb 26, 2013
filing date -
Jan 9, 2013
priority date (Note) -
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Abstract
A multi-channel switchmode audio amplifier is configured by a programmed processor such that each channel drives separate loads, is connected in parallel or is configured in a bridge-tied mode as well as combinations thereof. In one embodiment, amplifier channels that are connected in parallel have power amplifiers that are driven with signals from a single modulator. A feedback circuit and error amplifier from one channel controls the modulated signal that is applied to each parallely connected amplifier channel. Current feedback circuits for parallely connected amplifier channels are eliminated by tightly controlling the timing of switching in the power amplifier output stages.
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