Patent ID: 8953345
Filing Date: 2015-02-10
Classification: H02M

Abstract:
1. A power converter device comprising: a leg including two semiconductor device groups which are connected in series, and the each semiconductor device group includes a switching element and a semiconductor element other than the switching element which are connected in parallel, a connecting point to which the semiconductor device groups are connected in series is an AC terminal, and both ends of the leg are DC terminals so that a current which flows in the each semiconductor device group includes a first division current that flows through the switching element and a second division current that flows through the semiconductor element other than the switching element in the each semiconductor device group; a current sensor which detects the current which flows in the each semiconductor device group; a voltage command generation unit which calculates a voltage command value to be outputted; a voltage drop calculating unit which calculates a voltage drop of the each semiconductor device group by using a current value which is detected by the current sensor and voltage drop characteristics including a division current characteristic of the each semiconductor device group; and a switching control unit which corrects the voltage command value which is generated by the voltage command generation unit by using the voltage drop which is calculated by the voltage drop calculating unit so as to control ON/OFF of the each switching element.