Patent ID: 6373335
Filing Date: 2002-04-16
Classification: H03F

Abstract:
An audio amplifier comprising:a) a power amplifier section which receives an audio input signal and positive and negative power inputs to produce an audio output; b) a power supply comprising a positive power supply section and a negative power supply section; c) said positive power supply section comprising: i. first transformer having a primary and a secondary winding, with the secondary winding being operatively connected to said power amplifier section to supply positive voltage power in part to the power amplifier section; ii. a first power switch section to supply current pulses to the primary winding; iii. a first filter circuit component connected to an output of said secondary winding of the first transformer to maintain voltage of the positive power output as a continuing variable voltage input; d) said negative power supply section comprising: i. a second transformer having a primary and a secondary winding, with the secondary winding being operatively connected to said power amplifier section to supply negative voltage power input to the power amplifier section; ii. a second power switch section to supply current pulses to the primary winding; iii. a second filter circuit component connected to an output of said secondary winding of the second transformer to maintain the voltage of the negative power output as a continuing variable voltage input. e) control circuit section responsive to an audio input signal to transmit pulse control signals to the first and second power switch sections in a manner to control the first and second power switch sections so that the power of the current pulses delivered to the primary windings has a proportional relationship to the strength of the audio signal so that the positive and negative voltage inputs to the amplifier section track the audio signal in a manner to maintain the positive and negative input voltages at a predetermined level range above and below voltage of the audio input.