Patent ID: 7580272

Claim:
A power source apparatus that converts AC power to DC voltage, the power source comprising: a power factor-improving unit that includes a reactor and a switching element and outputs an output voltage as a load voltage to a load; a current-instruction-amplitude-value preparation unit that generates a current instruction amplitude value based on a deviation between a target output voltage instruction value and the output voltage; a current-instruction-value preparation unit that generates, as a current instruction value, a modeling waveform obtained by reducing a harmonic component of a predetermined order from a current waveform; and a switching control unit that ON/OFF-controls the switching element in an interval of the former half of a half cycle of the AC power based on a comparison result obtained by comparing an input current and the current instruction value, wherein the current-instruction-value preparation unit includes an integration unit that integrates a DC current value depending on the current instruction amplitude value to prepare the current instruction value according to which the former half of the half cycle of the AC power is a straight line part.