Power conversion device

摘要

A power converter includes a first arm configured by connecting a diode to a switching element, a second arm configured by connecting a diode to another switching element, a third arm formed of a first bidirectional switch configured by connecting switch elements, and a fourth arm formed of a second bidirectional switch configured by connecting other switch elements. An inverter circuit is configured by connecting the first and second arms in series between terminals of a direct current power source circuit, by connecting the third arm between a terminal of an alternating current power source and an output terminal, and by connecting the fourth arm between the output terminal and another output terminal. The control mode of the inverter circuit is switched between control modes at a timing at which at least one common arm continues a conductible condition.

主权项

1. A power conversion device, comprising:
a power converter which has: first to fourth input terminals; a first output terminal; a second output terminal connected to the fourth input terminal; and first to fourth arms connected between the respective first to fourth input terminals and the first output terminal, and which, using voltages input from the first to fourth input terminals, outputs an alternating current voltage between the first and second output terminals, wherein the power converter operates in a control mode which alternately turns on and off two arms selected from among the first to fourth arms, the power converter has two or more of the control modes set by combining different arms, and the power converter, when switching operation from one control mode to another control mode, carries out the control mode switching at a timing at which at least one common arm continues a bidirectionally conductible condition before and after the switching; wherein the two or more control modes include outputting a voltage of a selected polarity using a selected one of combinations of at least one of a direct current voltage or an alternating current voltage.