Patent ID: 8693221
Filing Date: 2014-04-08
Classification: H02M

Abstract:
1. An electric power converter apparatus comprising: an inverter circuit having a plurality of upper arm elements and a plurality of lower arm elements, the inverter circuit being a single-phase system connected inverter circuit; a feedback controlling module calculating a voltage command value in order to control an output from the inverter circuit in a feedback control manner; and a compensating module compensating the voltage command value with a compensation amount and outputting a compensated voltage command value, wherein each of the plurality of upper arm elements and the plurality of lower arm elements is operated to switch over based on a control signal that is set according to the compensated voltage command value and a dead time, wherein the compensation amount is set by the compensating module according to a polarity of an output current of the inverter circuit and an estimated distortion formed in a waveform of the output current in order to compensate a fluctuation in the output current due to the dead time, wherein the compensation amount is reduced during an estimated period of distortion occurrence in the waveform of the output current, and wherein the estimated period of distortion occurrence starts at a point when an absolute value of the output current decreases to a predetermined current value and ends at a point when the absolute value of the output current decreases to zero.