| 摘要 |
PROBLEM TO BE SOLVED: To provide a switching power supply device which can receive inputs from two systems which are a main input from a primary side and an auxiliary input from a secondary side by using one and the same transformer. SOLUTION: The switching power supply device comprises the transformer 6 having a primary winding and a plurality of secondary windings and a first switching element 3 which controls a first DC voltage 1 fed to the primary winding, and rectifies and smoothes secondary-side AC voltages generated at the plurality of secondary windings by the switching of the first DC voltage 1. The switching power supply device also comprises switches 6, 7 each switching the first DC voltage 1 and a second DC voltage 5 which are fed to the transformer 6. COPYRIGHT: (C)2008,JPO&INPIT
|
