Patent ID: 7969752

Claim:
A switching power supply device using a current sharing transformer comprising: an inverter switching unit for switching an input voltage; a set of share inductors connected to the inverter switching unit for distributing a current supplied by the inverter switching unit; a first transformer and a second transformer each having a primary side connected to the set of share inductors, and the primary sides of the first and second transformers being connected in parallel to each other; and a rectifying unit connected to secondary sides of the first and second transformers, wherein the set of share inductors comprises: a first share inductor of which one end is connected to the inverter switching unit and the other end thereof is connected to the primary side of the first transformer; and a second share inductor of which one end is connected to the inverter switching unit and the other end thereof is connected to the primary side of the second transformer, the one end of the first share inductor connected to the inverter switching unit and the one end of the second share inductor connected to the inverter switching unit being connected to each other.