Class D amplifier with increased efficiency

Details Class D amplifier with increased efficiency Class D amplifier with increased efficiency

2007-07-31

2009-11-17

Nguyen, Khanh V (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P

Reexamination Certificate

active

07619471

ABSTRACT:
The present invention is a method of operating a speaker by converting an audio signal to a pulse-width modulated signal that has a plurality of positive pulses and a plurality of negative pulses as a function of the audio signal, then driving an H-bridge circuit interconnected to a speaker, wherein the H-bridge circuit comprises an A-side and a B-side, wherein the A-side comprises a first switching transistor and a second switching transistor, and wherein the B-side comprises a first switching transistor and a second switching transistor. For each positive pulse, the A-side of the H-bridge circuit is driven by pushing the first switching transistor of the A-side while grounding the second switching transistor of the A-side. For each negative pulse, the B-side of the H-bridge circuit is driven by pushing the first switching transistor of the B-side while grounding the second switching transistor of the B-side.

REFERENCES:
patent: 7026866 (2006-04-01), Llewellyn
patent: 2008/0111620 (2008-05-01), Menard et al.

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