Integrated audio amplifier
OwnerRobert W Carverinventor
Life of this patent
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Abstract
An audio amplifier comprising a power amplifier section, a power supply, and a control circuit. The power supply is made up of a positive and negative power supply section, with the positive supply section and the negative supply section delivering, respectively, positive and negative power inputs through the power amplifier section. Each power supply section comprises a transformer and a switch section to supply current pulses to the primary winding of the transformer. A filter circuit component is connected to an output of each secondary winding. The control circuit controls the strength of the current pulses of the power supply sections in accordance with the strength of the audio signal.
Claims28
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.
Dependencies are inferred from the claim text.