| 摘要 |
PROBLEM TO BE SOLVED: To reduce a power loss accompanying conversion in a three-phase AC power supply device and a power conversion device used in the three-phase AC power supply device.SOLUTION: A power conversion device 100P comprises: conversion devices 100 for each phase which individually convert DC voltage input from a DC power supply 5 to voltage having an AC waveform to be output to each phase with regards to a neutral point of three-phase AC; and a control unit for controlling the conversion devices. Each conversion device 100 includes: a first conversion unit which includes a capacitor 14 and a DC/DC converter including an isolation transformer 12 and converts, by the control unit controlling the DC/DC converter, input DC voltage to voltage including a pulse waveform corresponding to the absolute value of an AC waveform to be output; and a second conversion unit which is provided at a stage behind the first conversion unit, includes a full-bridge inverter 21, and converts the voltage including the pulse waveform to voltage having an AC waveform by inverting, by the control unit controlling the full-bridge inverter 21, polarity of the voltage including the pulse waveform for each cycle. |
