| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 102 === 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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