本論文主要研製一台適用低壓輸入、高壓輸出系統之1000W二次側諧振槽串聯諧振轉換器(Series Resonant Converter, SRC)。以往一般半橋式串聯諧振轉換器較適用於高壓輸入、低壓輸出系統，當應用在低壓輸入、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。本論文將諧振槽置於變壓器二次側，如此將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，因此適合操作在零電流切換區。由於切換頻率需小於諧振頻率，當輕載操作時輸出電壓無法有效地調變。針對此問題，本論文透過理論基礎及動作狀態分析，推導二次側串聯諧振轉換器各區間動作之數學模型，且用Mathcad模擬軟體解析增益函數與品質因數Q 值之間的關係，以變換切換頻率的方式解決輸出穩壓問題。最後運用市售之CM6900加上改變回授之外接電路，設計實作一1000W二次側諧振槽串聯諧振轉換器，輸入電壓12V、輸出電壓200V、輸出電流1.25 ~ 5A、功率開關切換頻率範圍為10 kHz ~ 65 kHz，能有效地調節輸出電壓使其維持在所需的規格範圍內。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 1000-W series resonant converter (SRC) with a secondary-side resonant tank. In general, a half-bridge SRC with primary-side resonant tank is adopted for the applications with high input voltages and low output voltages. When it is applied on the 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. The series resonant converter with secondary-side resonant tank can solve the design problem of resonant elements in this thesis. When the SRC with secondary-side resonant tank is suitable for low input voltage and high output voltage applications, the zero current switching can be easy to achieve because the primary switch current is high. When the SRC is operated at light load condition, its output voltage can’t be regulated well because the switching frequency is always less than the resonant frequency. This thesis aims to analyze the operating principle and derive the mathematic model for the studied series resonant converter with a secondary-side resonant tank. By using the simulation software Mathcad, the relationship between gain functions and quality factor is analyzed and discussed. A frequency modulation strategy is also used to regulate the output voltage. Finally, a laboratory prototype with 12V input, 200V output and 1.25A to 5A output current 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. Good voltage regulation feature can be achieved according to the experimental results of the prototype circuit.

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