PURPOSE: A power conversion device is provided to supply a insulating transformer which can be manufactured at a low cost. CONSTITUTION: A DC voltage is connected to a power conversion main circuit through a DC generator in a power conversion device. A power conversion element is switched at a random time width and period in a power conversion main circuit. A unit element is comprised of a plurality of power conversion element which is serially connected or one power conversion element. Switching of a power conversion element is drives by an element driving signal written by a driving circuit.
