Switching power supply

Details Switching power supply Switching power supply

1997-12-04

1999-07-27

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 20, 315307, H02M 3335, G05F 100

Patent

active

059301244

ABSTRACT:
A switching power supply is provided in which the efficiency is improved and the regulation and cross-regulation of an output voltage is also improved. Terminals (A) and (B) of a primary winding N1 and secondary winding N2 at which the same polarity is set are interconnected via a first capacitor C4. A tap provided at a given winding position (C) of the primary winding N1 and the other terminal (D) of the secondary winding N2 are interconnected via a second capacitor. Herein, assuming that areas of the primary winding N1 divided by the tap are N.sub.11 and N.sub.12, the number of turns in the area N.sub.11 between the terminal (A) and winding position (C) is nearly the same with the number of turns existing between the one terminal (B) of the secondary winding N2 and the other terminal (C) thereof. Owing to the configuration, an equivalent coupling coefficient observed between the primary winding N1 and secondary winding N2 approaches 1.0. Consequently, the efficiency of a power supply can be improved, and regulation and cross-regulation can be improved.

REFERENCES:
patent: 4017761 (1977-04-01), Woldring

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