Power conversion device

An electric power conversion device, comprising:

• a conversion circuit having plural pairs of bi-directionally switchable switching elements connected so respective phases, the conversion circuit being configured to convert an inputted alternating current electric power into an alternating current electric power;
• voltage detecting means for detecting input voltages to the conversion circuit;
• and
• control means for switching on and off of the switching elements to control the conversion circuit,
• wherein the control means comprises:
• a switching time calculating section configured to calculate a first switching time during which one of the switching elements of an upper arm circuit of the plural pairs of switching elements included in one phase from among the respective phases is turned on, the other switching elements of the upper arm circuit of the plural pairs of switching elements included in the other phases are turned off, at least one switching element of a lower arm circuit of the plural pairs of switching elements included in the other phases is turned on, and the other switching elements of the lower arm circuit of the plural pairs of switching elements included in the one phase are turned off using the detected voltages detected by the voltage detecting means and an output command value and to calculate a second switching time during which the plural pairs of switching elements included in the one phase from among the respective phases are turned on and the plural pairs of switching elements included in the other phases from among the respective phases are turned effusing a carrier and the first switching time;
• and
• a control signal generating section configured to generate control signals to switch on and off of the switching elements using the first switching time and the second switching time, wherein the control means turns off one of on state switching elements of either one of the upper arm circuit or the lower arm circuit and maintains the on state of the other of the on state switching elements of the other arm circuit, in a case where a state is transited from the first switching time to the second switching time.