Switching power supply device and electronic apparatus

Details Switching power supply device and electronic apparatus Switching power supply device and electronic apparatus

2005-04-20

2008-10-07

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S021070, C363S021150

Reexamination Certificate

active

07433208

ABSTRACT:
A switching power supply device includes a primary winding of a transformer that is connected in series to a first switching element, and a secondary winding is provided with a rectifier circuit and an output voltage control circuit arranged to detect an output voltage and feed it back to a control circuit. The control circuit is provided with an on-period control circuit arranged to turn off the first switching element in an on-state based on a feedback signal from the output voltage control circuit and an off-period control circuit arranged to control an off-period thereof by delaying turn-on of the first switching element based on the feedback signal.

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International Search Report for PCT Application No. PCT/JP2005/007496; International filing date, Apr. 20, 2005; mailed Aug. 9, 2005.
Official Communication issued in corresponding GB Patent Application No. GB0601032.6, dated Aug. 31, 2006.
Official communication issued in counterpart Chinese Application No. 200580000536.2, mailed on Mar. 7, 2008.

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