全橋式LCC諧振轉換器之研製 ; Study and Implementation of Full-bridge LCC Resonant Converter

國立臺灣科技大學電子工程系 ; 學位：碩士 ; 指導教授：邱煌仁、謝耀慶 ; 本論文主要研製一台規格為輸入電壓380 V、輸出電壓12 V、輸出電流58 A、具同步整流之全橋式LCC諧振轉換器電路，其主要切換功率開關具有零電壓切換的特性，可以減少切換損失；由於輸出為低電壓大電流，故二次側採用同步整流開關來取代傳統的蕭特基二極體，以減少導通損失，提升電路整體效率。本文首先探討諧振式電源轉換器的基本原理，後分析本論文電路各階段的電路動作原理、並利用數學軟體Mathcad運算及推導出諧振槽轉移函數，以繪製不同品質因數Q、諧振電容Cr1、Cr2之比值K，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輸入電壓380 V、輸出電壓12 V、輸出功率700 W之全橋式LCC諧振轉換器，並將量測結果與理論相互印證。 This thesis developed a specification for the input voltage 380 V, output voltage 12 V, output current 58 A, with synchronous rectification of the full-bridge LCC resonant converter. 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 resonant converter is discussed. The operation principles and equivalent circuit of different working intervals 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), capacitor ratio (K), on the frequency response of the voltage gain of resonant tank. Finally, a input voltage 380 V, output voltage 12 V, output power 700 W, prototype circuit of an full-bridge LCC resonant converter with synchronous rectification was implemented. Theoretical analyses are verified with the experimental results.