A High-Input-Voltage Converter Operating at 200kHz

Satoshi OHTSU  Hisao ISHII  Takashi YAMASHITA  Toshiyuki SUGIURA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E75-B   No.11   pp.1151-1158
Publication Date: 1992/11/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Telecommunications Energy Systems and Switching Power Converters)
Category: 
Keyword: 
high-input-voltage,  two-MOSFET forward converter,  stray capacitance,  resonant reset,  reset circuit,  

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Summary: 
A new circuit and a transformer structure is described for a high-input-voltage converter operating at a high switching frequency. The two-MOSFET forward converter is suitable for a high-input-voltage converter. To increase the switching frequency, the reset period of the transformer core flux must be reduced. There are a few methods for decreasing the reset period. Increasing the transformer flyback voltage and reducing its stray capacitance are effective in decreasing the reset period without increasing power loss. A new two-MOSFET forward converter is proposed which uset the increased flyback voltage and a transformer structure to reduce the stray capacitance. The new converter using this transformer provides the basis for a 48-V, 100-W output, 270-V input converter operating at 200kHz with high efficiency (above 95%).