Patent ID: 7863841

Claim:
A power amplifying apparatus for power amplifying an input signal comprising: a full bridge power circuit having a source terminal, an input terminal and a pair of output terminals; a switching power converter coupled to a power source, to the electrical ground terminal and having an input terminal to control the output voltage of said switching power converter, and an output terminal coupled to the source terminal of said full bridge power circuit; an amplifier coupled to said output terminals of said full bridge power circuit and having an output terminal coupled to said input terminal of said switching power converter; wherein said input signal is applied to said input terminal of said full bridge power circuit; wherein said full bridge power circuit comprises a pair of half bridge power amplifiers; whereby said amplifier generates a signal coupled to said output terminal of said amplifier whose amplitude is representative of the differential voltage between a voltage reference and the voltage of the output terminals of said full bridge power circuit, and whereby the voltage at said output terminal of said switching power converter is regulated to obtain the minimum necessary voltage at said output terminals of said full bridge power circuit to establish the desired current path in a load coupled between said output terminals of said full bridge power circuit.