ELECTRIC POWER CONVERSION DEVICE, FREEZING AIR CONDITIONER AND CONTROL METHOD OF ELECTRIC POWER CONVERSION DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain an electric power conversion device capable of preventing degradation in current detection performance in a phase current detection method using a DC bus current and largely corresponding to various motors and systems.

SOLUTION: An electric power conversion device comprises: a duty distribution part 305 which distributes duty to at least one type of real vector and at least one type of zero vector on the basis of a voltage command vector; a duty redistribution part 306 in one carrier period 306 which redistributes PWM duty to three types of real vectors and at least one type of zero vector in one carrier period on the basis of the duty allocated by the duty distribution part; and a duty redistribution part 307 in multiple carrier period which redistributes the duty redistributed by the duty redistribution part 306 in one carrier period so that the duty is changed for each carrier period in one change period regarding the multi carrier periods as the one change period.

COPYRIGHT: (C)2013,JPO&INPIT