Power supply apparatus

摘要

A power supply apparatus in which a series circuit of first and second switching elements not blocking their reverse-directional currents is connected in parallel to a series circuit of a D.C. power source and a capacitor, a primary winding of a transformer is connected between a junction point of the D.C. power source and capacitor and a junction point of the switching elements, a secondary winding of the transformer is connected to a load circuit, and a controller is provided for controlling ON and OFF operation of the switching elements to cause a switching frequency of the switching elements to be set higher than a resonance frequency of the capacitor and an inductance of the transformer and to cause a voltage across the capacitor to increase.