SWITCHING POWER SUPPLY DEVICE

摘要

A plurality of power supply circuits (Z1') are arranged corresponding to load capacities. Direct current input Vi sides of the power supply circuits are connected in parallel, and alternating current output Ao sides are connected in series. On the both ends of one output provided by the series connection of the alternating current output Ao sides, one rectifying circuit (DC1) is connected through one resonance circuit (Z2). Switching frequencies are controlled at the same time by a single control signal outputted from a control circuit (S1) based on a direct current output voltage detected from the rectifying circuit (DC1) through a detection resistor (R5).