Power conversion device

A power conversion device comprising:

• a reactor formed such that a DC winding and a plurality of coupled windings are wound around one magnetic body, one end of the DC winding is connected to a voltage source, one end of each of the plurality of coupled windings is connected to another end of the DC winding, another end of each of the plurality of coupled windings is connected to each intermediate connection point between a plurality of upper and lower arms composed of switching elements, and magnetic fluxes generated by currents flowing through the DC winding and the coupled windings merge with each other in the same direction;
• and
• a control device for controlling the switching elements, wherein
• control is performed such that
• when a duty of switching operation is smaller than 0.5, the upper arms or the lower arms are subjected to in-phase driving, and
• when the duty is greater than 0.5, driving for the upper arms or the lower arms is switched to interleave driving.