本篇論文主要研製一台輸出規格為12 V/20 A、具同步整流之數位控制半橋串聯諧振轉換器，其變壓器一次側上下橋開關導通時具有零電壓切換的特性，可以用來減少切換損失；由於輸出為低電壓大電流的規格，故變壓器二次側使用同步整流開關來代替以往使用的蕭特基二極體，可以用來減少導通損失，提昇電路整體效率。本文一開始先探討半橋串聯諧振轉換器與半橋LLC型式的串聯諧振轉換器的理論基礎，以及分析各個階段的電路動作原理和等效電路的推導，並利用數學軟體Mathcad和推導出來的諧振槽轉移函數，來繪製不同品質因數Q、電感比值K、特性阻抗Z0、諧振電感Lr、變壓器圈數比n與雜散電容Cs在諧振槽增益曲線上的變化趨勢，以利設計轉換器諧振槽時，能掌握參數變化對於諧振槽的影響。最後實作出一台輸出規格為240 W/12 V之半橋串聯諧振轉換器，並利用德州儀器所開發的數位信號處理器TMS320F28035來實現數位控制，將實測結果和理論相互印證。

This thesis presents the study and implementation of a digitally-controlled half-bridge (HB) series resonant converter (SRC) with synchronous rectification. The output specifications of this circuit are an output voltage of 12 V and an output current of 20 A. The primary-side switches possess the turn-on with zero-voltage switching (ZVS) in order to reduce the switching losses. Because of the low output voltage and high output current, the synchronous rectifiers are used instead of the schottky diodes on the secondary side to reduce the conduction losses and improve the overall efficiency. Firstly, the analysis of basic circuit theories for HB SRC and LLC-SRC are discussed. The operation principles and equivalent circuits of different working intervals of SRC and LLC-SRC are also discussed and derived, respectively. Then, according to the derived transfer function of the resonant tank, a mathematical software Mathcad is used to plot the different parameter curves for quality factor (Q), inductance ratio (K), characteristic impedance (Z0), resonant inductance (Lr), transformer turns ratio (n), and stray capacitance (Cs) on the frequency response of the voltage gain of resonant tank. Finally, a 240-W prototype circuit of an HB SRC with synchronous rectification was implemented, and control stage of the prototype circuit was realized by using Texas Instruments DSP chip TMS320F28035. Theoretical analyses are verified with the experimental results.

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