Amplifiers – With semiconductor amplifying device – Including particular power supply circuitry
Patent
1999-03-31
2000-08-15
Pascal, Robert
Amplifiers
With semiconductor amplifying device
Including particular power supply circuitry
330263, 330 10, H03F 304
Patent
active
06104248&
ABSTRACT:
Disclosed is an audio amplifier with a tracking power supply that uses inductive power converters to provide positive and negative amplifier operating potentials of a magnitude that exceeds the DC voltage available to power the amplifier. The tracking power supply includes both a positive-going tracking-up converter and a negative-going tracking-up converter. Each of the tracking-up converters include an inductor, a capacitor, a diode, and a pulse-width modulator. The pulse-width modulator of the positive-going tracking-up converter produces signals representative of the positive amplitude of the audio signal being amplified and the pulse-width modulator of the negative-going tracking-up converter produces signals representative of the negative amplitude of the signal being amplified. The pulses-width modulated signals activate switches that cause current flow to increase through the inductors and subsequently cause the inductors to direct current to the capacitors in a manner that charge the capacitors to the proper tracking voltages.
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Edoardo Botti et al., "A High Efficiency 4X20 W Monolithic Audio Amplifier for Automobile Radios Using a Complementary D-MOS BCD Technology,"IEEE Journal of Solid-State Circuits, vol. 31, No. 12, Dec. 1996, pp. 1895-1901 .
Nguyen Khanh Van
Pascal Robert
LandOfFree
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