本文應用變頻控制技術與半橋AC-DC LLC諧振轉換器的架構特性，同時具有高功率因數與零電壓切換特性，並加入另一個諧振槽。第一個諧振槽設計15 V到43 V，第二個諧振槽設計5 V到15 V，或使用二次側使用串聯輸出，來達到最大電壓輸出，來改善半橋增益不足問題。
單級半橋AC-DC LLC諧振轉換器，在使用相對較少元件情況下，同時擁有功率因數校正特性與諧振轉換器特性。
本文提書一轉換器輸入電壓為110 V，諧振頻率為200 kHz，輸出電壓為5 V到48 V，額定功率為240 W。驗證脈衝頻率調變技術與AC–DC LLC在雙諧振槽模式變換，可達到寬輸出可行性。其實作電路效率可達84.2%。

This thesis applies Pulse-Frequency Modulation (PFM) and the architecture characteristics of the half-bridge AC-DC LLC resonant converter. It simultaneously achieves high power factor and zero-voltage switching characteristics while incorporating an additional resonant tank. The first resonant tank is designed for a voltage range of 15 V to 43 V, while the second resonant tank is designed for a voltage range of 5 V to 15 V. Alternatively, a series output could be used on the secondary side to achieve maximum voltage output and improve the issue of insufficient gain in the half-bridge converter.
The single-stage half-bridge AC-DC LLC resonant converter achieves both power factor correction and resonant converter characteristics while using relatively fewer components.
Finally, the implemented converter operates with an input voltage of 110 V, a resonant frequency of 200 kHz, a output voltage is from 5 V to 48 V, and a rated power is 250 W. The feasibility of the pulse frequency modulation technology and AC-DC LLC in dual resonant tank mode conversion is verified to achieve a wide output voltage range. The maximum efficiency of the operational circuit is 84.2%.

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