Audio Amplifier Power Supply with Inherent Power Factor Correction
First Claim
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1. An audio amplifier power supply with inherent power factor correction, the audio amplifier power supply comprising:
- (a) a rectifier circuit configured for rectifying an input voltage from an alternating current (AC) power source;
(b) a discontinuous mode multiphase isolated flyback power circuit configured for receiving the rectified input voltage from the rectifier circuit and supplying a phase-summed direct current (DC) voltage; and
(c) wherein the discontinuous mode multiphase isolated flyback power circuit further comprises a balancing circuit configured for balancing currents across each phase of the multiphase isolated flyback power circuit.
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Abstract
An audio amplifier is powered by a switch mode power supply optimized for audio applications. The power supply includes a rectifier circuit and a discontinuous mode multiphase isolated flyback power circuit and does not require a separate power factor correction stage. The discontinuous mode multiphase isolated flyback power circuit includes multiple isolated flyback converters operating synchronously to each convert a portion of the power and supply a phase-summed direct current voltage to the audio amplifier.
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Citations
16 Claims
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1. An audio amplifier power supply with inherent power factor correction, the audio amplifier power supply comprising:
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(a) a rectifier circuit configured for rectifying an input voltage from an alternating current (AC) power source; (b) a discontinuous mode multiphase isolated flyback power circuit configured for receiving the rectified input voltage from the rectifier circuit and supplying a phase-summed direct current (DC) voltage; and (c) wherein the discontinuous mode multiphase isolated flyback power circuit further comprises a balancing circuit configured for balancing currents across each phase of the multiphase isolated flyback power circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for supplying power inherently corrected for power factor, comprising the steps of:
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(a) rectifying an input voltage of an AC power source; (b) controlling the duty cycle of a switch of a parallel isolated flyback converter to convert a portion of the input power; (c) repeating the step of controlling the duty cycle of a switch of a parallel isolated flyback converter to convert a portion of the input power for n parallel isolated flyback converters in succession such that the duty cycle of each successive switch of the n parallel isolated flyback converters is 360/n degrees out of phase with the duty cycle of the previous switch; (d) supplying a phase summed direct current voltage to an audio power amplifier; (e) determining a current through a switch for each of the n parallel isolated flyback converters; (f) calculating an average current of each of the n parallel isolated flyback converters as a direct current value; (g) for each of the n parallel isolated flyback converters, determining a difference between the average current and the current in that phase; and (h) for each of the n parallel isolated flyback converters, adjusting the duty cycle of that parallel isolated flyback converter according to the determined difference. - View Dependent Claims (15, 16)
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Specification