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  • 學位論文

新型輕載零電壓切換之同步整流降壓式轉換器

Synchronous Rectifier Ruck Converter with Zero-Voltage-Switching Under Light Load Condition

指導教授 : 王建民
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摘要


本論文提出三種提高具零電壓切換之同步整流降壓式轉換器輕載效率的控制策略。同步整流控制技術是適合於直流低壓輸出的應用,因為將輸出整流器的二極體以MOSFET取代,具有較低導通損失,可提升整體電路的效率。加入零電壓切換,效率有明顯的提升,但在輕載條件下,效率較差。 本文以三種不同的控制策略,使零電壓切換之同步整流降壓式轉換器在輕載條件時,提高輕載效率。並確認了本文所提技術的可能性,驗證所提控制策略之可行性。

並列摘要


This paper presents three improved zero-voltage-switching of synchronous rectifier buck converter efficiency at light loads control strategies. Synchronous rectification control technology is suitable for direct application of low voltage output because the output rectifier diode with a MOSFET replacemet, with low conduction losses, can improve the overall efficiency of the circuit. Join the zero-voltage-switching, efficiency has been significantly improved,but under lightly loaded conditions, efficiency is poor. In this paper, three different control strategies, the zero-voltage-switching of synchronous rectifier buck converter in light load conditions improve efficiency at light loads.The possibility of this technology is confirmed.Also the feasibility of the proposed strategy is venfied.

參考文獻


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