共振重置順向式轉換器之自驅式同步整流分析

本論文首先探討使用自驅同步整流共振重置順向式轉換器之變壓器磁通重置的情形，經由詳細分析的表示式中，可推導出轉換器元件如變壓器磁化電感與重置時間之關係。其結果可預測共振重置順向式轉換器之最大切換工作頻率。除此之外，同時探討自驅同步整流器之驅動波形，並提出兩種改善閘極的驅動方法，以滿足輸入電壓寬廣變動，藉助於驅動電壓之延長導通時間與箝位，使效率得以提高；並使驅動電壓得以箝位於安全電壓準位。最後研究室中完成一組輸入電壓為36V-72V，輸出為3.3V/3A，與切換頻率為400kHz 之共振重置順向式轉換器。實驗結果可印證所提方法之可行性。

關鍵字

順向式轉換器；磁通重置；自驅式同步整流

並列摘要

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.

並列關鍵字

forward converter ； flux reset ； self-driven synchronous rectification(SDSR)

參考文獻

[7]張煌章，具同步整流之主動箝位順向式轉換器分析與研製，碩士論文，崑山科技大學電機工程系，2007年。

[15]劉文淵，順向式轉換器LCD緩衝器之研究，碩士論文，崑山科技大學電機工程系，2010年。

[21]鄭永昇，類比及數位控制之升壓型功率因數校正整流器研製，碩士論文，崑山科技大學電機工程系，2010年。

[4]N. Murakami, and M. Yamasaki, “ Analysis of a Resonant Reset Condition for a Single-Ended Forward Converter, ” 19th Annual IEEE, Power Electronics Specialists Conference, pp.1080-1023, 1988.

[6]S. S. Lee, S. W. Choi, and G. W. Moom, “High-Efficiency Active-Clamp Forward Converter With Transient Current Build-Up (TCB) ZVS Technique,” IEEE Transactions on Industrial Electronics, Vol. 54, No. 1, February 2007.

國際替代計量

共振重置順向式轉換器之自驅式同步整流分析

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