RECTIFIED HIGH FREQUENCY POWER SUPPLY WITH LOW TOTAL HARMONIC DISTORTION (THD)

摘要

A method and apparatus that performs AC to DC power conversions without creating significant 50 or 60 Hz harmonic currents and voltage distortions on the AC power source conductors thus minimizing the need for ancillary harmonic filtering of 50 or 60 Hz harmonics. The method and apparatus is embodied in a circuit that first performs balanced modulation on a 50 Hz or 60 Hz power voltage converting it to a higher frequency, then subsequently passing the resulting wave through a step-up transformer to produce a higher voltage wave and finally rectifying and filtering the higher voltage wave to produce a DC voltage. The higher frequency waveform may be pulse width modulated to effect output DC voltage regulation. The circuit is typically comprised of semiconductor switches, pulse control circuits, transformers, filter capacitors, filter inductors, semiconductor diode rectifiers, DC voltage measurement circuits and other components.