本文目的在於研究並實作出一台3 kW鋰離子電池充電器，前級採用兩相交錯式升壓型功因修正器以提升功率因數、降低輸入電流漣波並縮小EMI濾波器體積。後級採用全橋式串聯諧振轉換器和降壓型轉換器，前者實現零電壓及零電流切換技術，降低切換損失提高效率，並具輸入及輸出的電氣隔離；後者降壓型轉換器包含定電流控制迴路及定電壓控制迴路實現鋰電池充電。本文最後成功實現了一組輸入交流電壓340 V~440 V，額定功率為3 kW，88.8 V輸出電壓的充電器，滿載效率達92%。

　　This thesis presents the study and Implementation of a 3-kW charger for Li-ion battery. The front stage is a two-phase interleaved boost power factor corrector (PFC) circuit to achieve high power factor, low input current ripple and decrease the volume of EMI filter. The second stage consists of a full-bridge series resonant converter (FB-SRC) and a buck converter. The former achieves zero-voltage switching (ZVS) so that the power switch loss can be reduced and the efficiency can be improved. In addition, it also has electrical isolation between input and output. The battery charger with both constant-current and constant-voltage control loops is fulfilled by a buck converter. Finally, a charge with rated power of 3 kW, AC input voltage from 340 V to 440 V, and an output voltage of 88.8V is implemented and tested. The measured peak efficiency is up to 92 %.

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