A Zero-Voltage-Switching Controlled High-Power-Factor Converter with Energy Storage on Secondary Side

Akira TAKEUCHI  Satoshi OHTSU  Seiichi MUROYAMA  

IEICE TRANSACTIONS on Communications   Vol.E80-B   No.12   pp.1763-1769
Publication Date: 1997/12/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Power Supply
high power factor,  zero-voltage-switching,  flyback converter,  discontinuous conduction mode,  

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The proposed high-power-factor converter is constructed with a flyback converter, and locates the energy-storage capacitor on the secondary side of the transformer. A high power-factor can be obtained without needing to detect any current, and the ZVS operation can be achieved without auxiliary switches. To make the best use of these advantages in the converter, ZVS operations and power-factor characteristics in the converter were analyzed. From the analytical results, the effective control method for achieving ZVS was examined. Using a bread-board circuit controlled by this method, a power-factor of 0.99 and a conversion efficiency of 88% were measured.