本論文中研製一數位控制之兩級式電池充電系統，系統前級為錯相式升壓型功率因數修正電路，用以降低輸入電流諧波失真並提供穩定輸出電壓；後級採用全橋隔離式諧振轉換器，以高效率提供穩態直流電壓、電流。首先分析錯相式升壓型功率因數修正電路與全橋諧振轉換器之動作原理，並採用一前饋式調節法，利用輸入電壓漣波作為前饋控制調整適當的頻率變化，以降低輸出兩倍市頻漣波。最後，實作一輸入電壓90 vac ~ 264 vac、輸出電壓48 VDC之3.5 kW電池充電系統測試與驗證理論之可行性。實驗結果顯示，交錯式升壓轉換器於輸入電壓為220 V時滿載效率可達96.7 %，且功率因數可達0.955以上，全橋諧振轉換器滿載效率可達94.3%，整體系統效率最高可達到93.9%

A digital controlled two-stage battery charge system is designed and implemented in this thesis. The front-stage of the system is an interleaved boost power factor corrector which is used to reduce input current harmonic distortion and provides stable bus voltage. An isolated full-bridge resonant converter which can provide stable voltage and current to the battery is adopted in the rear-stage. The operating principles of both the power factor corrector and full-bridge resonant converter are discussed in detail. An adaptive frequency modulation method with input voltage ripple feed-forward control is adopted to reduce the double-line-frequency ripple. Finally, a battery charge power system with rated power of 3.5 kW and output voltage of 48 VDC is implemented and tested at input voltage 90 vac ~ 264 vac to validate its feasibility. According to the experimental results, the full load conversion efficiency at vac= 220 V of the interleaved boost converter is 96.7% and the power factor is over 0.955. The full load conversion efficiency of the full-bridge resonant converter is 94.3%, and the highest efficiency of system is 93.9%.

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