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A High-Input-Voltage Converter Operating at 200kHz
Satoshi OHTSU Hisao ISHII Takashi YAMASHITA Toshiyuki SUGIURA
IEICE TRANSACTIONS on Communications
Publication Date: 1992/11/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Telecommunications Energy Systems and Switching Power Converters)
high-input-voltage, two-MOSFET forward converter, stray capacitance, resonant reset, reset circuit,
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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%).