因應供電需求吃緊與地球暖化現象，高功率密度和高效率電源已成為現今電源設計之主流趨勢，為了達成此一目的，本論文結合升壓式功率因數修正器與半橋LLC諧振轉換器來提升交流轉直流轉換器之效率。本論文研製一240W輸出之電源供應器，整體架構包含兩個部分，前級為臨界導通模式之升壓型功率因數修正器，用以改善電源側之功率因數，後級使用半橋LLC諧振轉換器來實現高效率直流轉換，最後再使用Microchip開發的數位處理器dsPIC33FJ16GS502與MCP4561數位電阻來實現對LLC諧振轉換器輸入電壓的調變控制。根據實驗結果，整體系統之轉換效率在輕載時高於87%，半載時高於92%，滿載時高於90%，平均提升了0.5%的效率，且在輕載時可以提升4%以上，達成提升的效率之目標。

In response to the tightness of power demand and global warming effect today, high power density and high efficiency power supplies have become the mainstream trend in power supply design. In order to achieve this goal, this thesis combines a boost-type power factor corrector (PFC) and a half-bridge LLC resonant converter to improve the efficiency of the AC to DC converter. This thesis develops a 240W output power supply. The overall architecture includes a front-end boost-type PFC with critical conduction mode (CRM) operation to improve the power factor of the ac line. The post stage utilizes a half-bridge LLC resonant converter to achieve high efficiency DC conversion. Experimental results show that the conversion efficiency of the overall system is higher than 87% at light load, higher than 92% at half load, and higher than 90% at full load. The average efficiency is increased by 0.5%, and the efficiency can be increased by more than 4% at light load. Therefore, the goal of improving efficiency is achieved.

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