| 摘要 |
PROBLEM TO BE SOLVED: To reduce a power loss caused by conversion, in a three-phase AC power supply device and a power conversion device used for the same.SOLUTION: A power conversion device 100P comprises: conversion devices 100 for respective phases each of which converts a DC voltage inputted from a DC power supply 5 into a voltage of an AC waveform to be outputted to each phase to a neutral point of a three-phase AC; and a controller that controls the conversion devices 100. Each conversion device 100 has: a first conversion part that has a DC/DC converter including an insulation transformer 12, and a capacitor 14, and that converts an inputted DC voltage into a voltage including a pulsating waveform corresponding to an absolute value of a voltage obtained by superposing a third-order high harmonic wave on a fundamental wave, as an AC waveform to be output, by controlling the DC/DC converter by the controller; and a second conversion part that is provided at a poststage of the first conversion part, and that has a full bridge inverter 21, and that converts the voltage including the pulsating waveform into a voltage of an AC waveform by inverting the polarity of the voltage including the pulsating waveform for each one cycle, by controlling the full bridge inverter 21 by the controller. |
