Patent ID: 6166605
Filing Date: 2000-12-26
Classification: H03F

Abstract:
An audio amplifier comprising:a) a power amplifier section which receives an audio input signal and positive and negative voltage 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. a 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 input to the power amplifier section;ii. a first power switching portion 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 the 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 switching portion 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) a control circuit responsive to an audio input signal to transmit pulse control signals to the first and second switching portions to cause said first and second switching portions to open and close in a manner to transmit current pulses to the primary windings of the first and second transformers, with power of the pulses having a proportional relationship to the strength of the audio signal, so that the positive and negative voltage power inputs to the amplifier section tracks the audio signal in a manner to maintain the positive and negative voltage power inputs at a predetermined level range above and below voltage of the audio input.