Electric power conversion device with push-pull circuitry

An electric power conversion device with push-pull circuitry for turning on/off a DC power supply alternately using two switching elements to convert the DC power to high-frequency pulses, applying the converted high-frequency pulses to two windings on the primary side of a pulse transformer, rectifying and smoothing the high-frequency pulses of different polarities produced from two windings on the secondary side of said pulse transformer to generate a DC current, and converting the DC current thus generated into an AC power supply,

• said electric power conversion device comprising a DC magnetic deviation prevention means for detecting the coil currents flowing in the two primary windings of said pulse transformer and balancing the coil currents by adjusting the on time of said two switching elements based on the difference between the coil currents to prevent the DC magnetic deviation of the primary windings of said pulse transformer.