Electric power conversion device and surge voltage suppressing method

摘要

To provide an electric power conversion device that converts direct current power supplied from a direct-current power supply into alternating current power, the electric power conversion device includes six switching elements constituted by a voltage-driven transistor that uses a wide bandgap semiconductor and a diode, and a drive circuit that controls a voltage for driving the transistor at a time of turning off the switching elements based on a predetermined voltage profile specifying that the transistor is operated in a non-linear region.

主权项

1. An electric power conversion device comprising:
a voltage-driven wide bandgap switching element that uses a wide bandgap semiconductor; and a drive circuit that preliminarily specifies a characteristic of a drain current for a drain voltage of the wide bandgap switching element, sets an area where a change of the drain current for the drain voltage becomes non-linear in the characteristic as a non-linear region. and controls a voltage for driving the wide bandgap switching element at a time of turning off the wide bandgap switching element based on a voltage profile being specified such that the wide bandgap switching element is operated in the non-linear region.