本論文提出對高效率LLC 諧振式轉換器之設計及基礎概念，並且在LLC諧振與同步整流之間做時序上連結，以降低暫態電壓與逆電流，進而可降低元件損失。為了接近市場應用，提出目前業界常使用之規格，以期在實際運用面得到發揮，讓高效率轉換器更能接觸到生活中，達成節能減碳之目的。本文所提出之利用同步整流線路可降低二次側流過大電流情況下之導通與切換損失，並且與高效率LCC諧振做時序上連結，以提升轉換器整體效率，因此，時序控制對電源供應器是相當重要的課題。最後，文中將依據電路分析設計與相關實務考量，製作一個具同步整流與LLC諧振雙變壓電源供應器，再藉由硬體量測結果驗證其效能及可行性，以符合實際商品化之高效率電源供應器。In this thesis, the basic concepts and designed guide lines of LLC resonant converter, the link on the timing between resonant and synchronous rectification to reduce the transient voltage and reverse currents and in turn decreasing the component losses are discussed. Moreover, for the purpose of market applications, the most commonly used specifications of the switching power supplies are discussed in order to introduce the high efficiency convertor products to the vast users to achieve the goals of energy saving and carbon reduction. Furthermore, the high conduction and switching losses due to high current can be reduced through the secondary side synchronous rectifier circuit. In addition, the link on the timing between resonant and synchronous rectification can reduce the transient voltage and reverse currents and in turn decreasing component losses. Thus, the efficiency of the switching power supplies can be improved. Finally, for practical applications, a LLC resonant converter with synchronous rectifier and parallel transformers has been built. The designed performance, feasibility and commercialization of the proposed high efficiency power supply can be verified effectively from the experimental measurements.
