Power conversion device

A power conversion device comprising a driving controller which controls a semiconductor switching element through PWM control, and configured to perform conversion between DC and AC, wherein

• the driving controller sets a pulse width for the PWM control using a PWM carrier wave, and with respect to a carrier frequency as a frequency of the PWM carrier wave, a gate voltage of the semiconductor switching element, and a gate resistance of the semiconductor switching element which are driving conditions for the semiconductor switching element, at a predetermined update timing, the driving controller obtains, through calculation, loss in the semiconductor switching element during a predetermined loss calculation period, on the basis of the driving conditions at present, and
• in a case where the loss is greater than a predetermined value, the driving controller repeats, a predetermined number of times, processing of obtaining the loss during the loss calculation period through calculation while changing the driving conditions, to determine the driving conditions that minimize the loss, and controls the semiconductor switching element with the determined driving conditions.