本文提出單級雙開關高功因充電電路，運用定頻控制之高頻PWM調變方式，並利用不需偵測輸入電流之功因修正技術，確保電源端達到高功因之標準並減少輸入電流諧波。應用雙開關架構及結合再生箝制之優點，一小容量再生電容搭配雙箝制二極體組合成能量回收之再生路徑，轉存漏感能量於再生電容及箝制開關電壓；可適用較高輸入電壓與選用較低導通損之功率元件，減少能量浪費及提昇系統效能。本文進一步提出一種新型高功因脈衝充電策略，運用二倍線頻120Hz電能達到大電流充電之效果。因此，本文研製電路具有簡單控制架構及體積小、重量輕等優越性。最後結合監測軟體，即時記錄電池充放電數據以探討電池之充放電特性；並以實測結果及電腦模擬驗證電路設計之可行性，除了具有功因修正功能外並能符合IEC之規範。

A single stage pulse charging topology with high power factor without sensing input current is proposed. The system structure is implemented with a two-switch flyback converter topology integrated regenerative clamping. Since the recycle energy stored in leakage inductance is converted to regenerative capacitor, conversion efficiency is thus increased. Further, the voltage stresses and conduction loss on the switches are greatly reduced, as compared with conventional flyback converter. The design and implementation of charging system is based on a single stage ac/dc flyback circuit topology to reduce the required hardware and obtain improved efficiency and reliability. Therefore, this single stage pulse charging topology makes it possible to achieve some better electrical performances, smaller physical size, lighter weight, and high efficiency in power conversion. Besides, a VB-based real-time monitor system is adopted to measure the battery charging data for analysis of pulse charge control characteristics. Computer simulation and experimental results are carried out to verify that the pulse charger circuit can achieve low total harmonic distortion (THD) and near unity power factor to meet IEC standard.

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