Patent ID: 7279967
Filing Date: 2007-10-09
Classification: H03F

Abstract:
1. A Class-D audio power amplification method, wherein about 80% of the power is delivered to a low-frequency driver using a full-bridge and about 20% of the power is delivered to a high-frequency driver using a half-bridge, and wherein the full-bridge and the half-bridge operate from a common power supply reservoir, the method comprising: generating a flat-topped rectangular switching waveform whose peak-to-peak value is maintained at a regulated level; maintaining a predictable voltage on at least one secondary capacitor reservoir by passing the generated waveform through a high frequency isolation transformer, with one or more secondary windings whose outputs are peak-to-peak rectified by high frequency diodes, wherein each secondary independently rectifies one square-wave voltage substantially undisturbed by loading of other secondaries, and wherein the waveform need not have any particular high-low duty cycle; and Reducing speed of up-down transitions of the switching waveform.