本論文主要研製一台500W寬輸入電壓範圍之雙組輸出半橋LLC串聯諧振轉換器，首先利用MATHCAD模擬軟體針對品質因數Q、K因子、特性阻抗Zo及圈數比n，分析與探討其轉移函數曲線。因雙組輸出的關係，負載會有一輕一重的情形發生，導致輸出電壓會產生交互調節(Cross Regulation)的現象。為了滿足規格要求，因此本文在設計雙組輸出時，採用雙變壓器與雙諧振槽之架構，藉此簡化變壓器圈數比之設計，並而降低繞製變壓器的困難度。
依照本文中所提之設計流程，分別可計算出雙組輸出所需之諧振槽參數值，再經過微調修正，最後實作出一台輸入電壓範圍在380V至400V、輸出電源規格為12V/35A與5V/15A、且輸出負載調節率為5%之半橋LLC串聯諧振轉換器電路。

This thesis focuses on the study and implementation of a 500-W double-output half-bridge LLC series resonant converter with wide input voltage range. The influences of the quality factor (Q), K factor (K), characteristic impedance (Zo), and turns radio (n) on the voltage gain transfer function have been analyzed and discussed by using the MATHCAD software. Since the implemented converter has two main outputs, there exists a phenomenon called cross regulation, which results in poor output voltage regulations when one output is at heavy load and the other at light load. In order to satisfy the output voltage regulation specifications, two transformers and two resonant tanks have been adopted for the presented converter in this thesis.
According to the formulated design procedures, each resonant tank component can be designed. Then circuit parameters are fine tuned and modified. Finally, a double-output half-bridge LLC series resonant converter is implemented. The input voltage range is 380V ~ 400V. The specifications of the two main outputs are 12V/2A-35A and 5V/0.3A-15A. And the output voltage regulation is within 5 percent.

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