| 摘要 |
PROBLEM TO BE SOLVED: To mitigate the current concentration to any secondary coil of a multi-output switching power unit, and also to reduce the power loss generated in each secondary output circuit. SOLUTION: The multi-output switching power unit is equipped with a main MOS-FET(3), a primary coil (2a) of a transformer (2)which is connected in series to a DC power source (1), first and second rectifying smoothing circuits (6 and 15) which are connected, respectively, to the first and second secondary coils (2b and 2c) coupled in reverse polarity with the primary coil (2a), a main control circuit (9) which switches on or switches off the main MOS-FET(3), according to the output voltage V<SB>O1</SB>of the first smoothing rectifying circuit (6), a MOS-FET (18) for output control which is connected between a second secondary coil (2c) and a second output smoothing capacitor (14), a reactor (31) which is connected between the MOS-FET (18) for output control and the second output smoothing capacitor (14), and an output control circuit (19) which switches on or switches off the MOS-FET (18) for output control, according to the output voltage V<SB>O2</SB>of the second rectifying smoothing circuit (15). COPYRIGHT: (C)2007,JPO&INPIT
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