高效率以及高功率密度已成為現今電源供應器設計不可或缺的一環，為了達成這一目的，應採用柔切技術(包括零電壓切換與零電流切換)，柔切能使電源轉換器同時達到高切換頻率與低切換損失。在眾多柔切換技術之中，半橋串聯諧振轉換器因具備高效率、低切換諧波、寬範圍輸入以及能達到高功率密度等特色，逐漸受到使用者的喜愛，若使用同步整流電路取代傳統全波整流，效率還能更進一步的提升。
本論文主要研製一350W輸出之電源供應器，整體架構包含兩個部分，前級的部分使用平均電流模式控制之功率因數修正器，藉此改善功率因數且減少輸入電流的諧波失真。後級利用Microchip開發的數位處理器dsPIC33FJ16GS502來實現LLC諧振轉換器的變頻控制，本論文亦以數位方式完成LLC諧振轉換器之同步整流驅動。根據實驗結果，功率因數修正器之轉換效率高於92%，功率因數高於0.96，數位同步整流LLC諧振轉換器可以實現效率高於90%之目標。

High efficiency and high power density have become a necessity in modern-day power-supply designs and their applications. To achieve such goals, soft switching techniques (including zero voltage switching and zero current switching) which allow the power converters to achieve both higher switching frequencies and lower switching losses should be adopted. Among soft switching power converters, the popularity of the LLC resonant converter is increasing because their several desired features such as high efficiency, low switching noise, wide input voltage range and ability to achieve high power density. By replacing the traditional full-wave rectifier with a synchronous rectifier circuit, the efficiency can further be improved.
The main purpose of this thesis is to research and implement a 350W power supply. The whole system configuration can be divided into two major parts. An average current mode controlled power factor corrector (PFC) in front stage is used as a regulator for improving the input power factor and reducing the total harmonic distortion. dsPIC33FJ16GS502 from Microchip corp. is used as the digital variable frequency controller of the LLC resonant converter. A digital implementation of synchronous rectification driving scheme for LLC resonant converter is also presented in this thesis. According to the experimental results, the PFC circuits can achieve efficiency higher than 92% and a power factor higher than 96%. The digitally-controlled LLC resonant converter with synchronous rectifier can achieve efficiency higher than 90%.

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