本論文主要研製一部適用於低壓輸入、高壓輸出系統之二次側諧振槽串聯諧振轉換器。一般串聯諧振轉換器適用於高壓輸入、低壓輸出系統，當應用於低壓輸入、高壓輸出系統時，負載反射至變壓器一次側之反射阻抗極小，當品質因數設計在較小值時，由於特性阻抗為反射阻抗與品質因數之乘積，所以特性阻抗將非常地小，導致諧振槽內之諧振元件不易設計。若將諧振槽置於變壓器二次側，如此可改善諧振元件不易設計之問題。當二次側串聯諧振轉換器用於低壓輸入、高壓輸出系統時，一次側開關電流較大，變壓器較不易繞製，若改為雙變壓器於一次側並聯可平均分配電流，並有利於散熱。本文利用市售之CM6900加上額外變頻控制電路，設計實作一400 W、輸入電壓24 V、輸出電壓200 V二次側諧振槽串聯諧振轉換器。除了分析電路動作原理之外，並提供實驗數據與模擬和理論相互印證。

This thesis focuses on the study and implementation of a series resonant converter (SRC) with a secondary-side resonant tank. In general, an SRC with primary-side resonant tank is adopted for the applications with high input voltages and low output voltages. When it is applied on a system with a low input voltage and high output voltage, the equivalent output load reflected from the secondary to the primary will be very small. If the quality factor is designed to be low, the characteristic impedance, which is equal to the gain of the quality factor and the reflected output load, will also be small. This causes difficulty in designing the resonant tank elements. However, for an SRC with secondary-side resonant tank suitable for low input voltage and high output voltage applications, the transformer is difficult to design because the primary switch current is high. Alternatively, two transformers paralleled at the primary side feature inherent current sharing, can solve the heat problem. A laboratory prototype with 24-V input and 200-V output was built and tested to verify the feasibility of the proposed scheme, a commercial IC CM6900 with a simple auxiliary circuit was used to realize the studied control strategy. Tight voltage regulation can be achieved according to the experimental results.

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