| Summary: | 碩士 === 崑山科技大學 === 電機工程研究所 === 99 === The reset condition of a transformer flux for a resonant reset forward converter with self-driven synchronous rectification (SDSR) is analyzed in this thesis. The exact analytical expressions are obtained and relationships between reset time and device parameters of converter such transformer magnetizing inductance are derived. The result shows that the maximum switching frequency of a resonant reset forward converter can be predicted.
Additionally, the driving waveforms for self-driven synchronous rectification circuit are also discussed. Two improved gate drive methods are presented for wide input voltage range. With the help of gate drive voltage retained and clamped, the results show that a relatively high efficiency is achieved and the gate drive voltage of the SR is clamped to a safety level.
Finally, Experimental results based on a 36V-72V input, 3.3V/3A output prototype are shown to verify the proposed scheme.
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