- 學位論文
新型零電壓/零電流切換之主動箝位電源轉換器
A Novel ZVS/ZCS Active-Clamping DC-DC Power Converter
摘要
本論文提出一個新型零電壓/零電流切換之主動箝位電源轉換器(A Novel ZVS/ZCS active-clamping DC-DC power converter)並對其進行動作原理及理論分析。零電壓/零電流切換之主動箝位電源轉換器主要包含兩部分: 初級側為由主動式箝位技術及定頻控制技術所構成;次級側為串聯諧振電路；其中主動式箝位技術能夠回收儲存在變壓器激磁電感之能量，讓主要開關及輔助開關於導通時達到零電壓切換(ZVS)，減少開關的切換損失，並減少主要開關之最大電壓應力；串聯諧振電路的部分為利用變壓器之漏感和次級側的諧振電容形成共振迴路，讓輸出二級體於截止時達到零電流切換(ZCS)，減少輸出二極體的切換損失。故此轉換器擁有定頻控制及大功率半導體元件具有柔性切換效果之優點。並再依據交錯式轉換器的原理提出零電壓/零電流切換之主動箝位交錯式電源轉換器，此電源轉換器除了擁有定頻控制及大功率半導體元件之柔性切換效果外，亦能達到降低電源轉換器的高度。根據理論及動作原理分析結果推導出設計準則，並依據準則設計且實作出切換頻率為80-kHz、輸出功率為500瓦特、輸入電壓為375伏特、輸出電壓為170伏特之電源轉換器，最後利用模擬軟體進行交錯式結構及並聯式結構比較。綜合上述可知，零電壓/零電流切換之主動箝位交錯式電源轉換器能有效運用於高效率、低雜訊、小型化及高電壓輸出之電漿(PDP)電視及發光二極體(LED)照明應用。
並列摘要
In this dissertation, a novel ZVS/ZCS active-clamping DC-DC power converter configuration is proposed. It consists of two parts: the primary side is a constant-frequency asymmetrical converter with active clamp feature and the secondary side is a series resonant tank circuit. The energy stored in the magnetizing inductance of transformer is recycled to allow main/auxiliary switches turn-on at zero-voltage switching (ZVS) and the voltage stress of the main switches is clamped. In the secondary side the transformer leakage inductance and secondary resonant capacitance are employed by the series resonant tank to achieve zero-current switching of the output diodes. The circuit features constant-frequency operation and soft switching for both main transistors and the rectifier diodes. Interleaving operation of this configuration combines the benefits soft switching and low-profiled package. An 80-kHz, 500-Watt, 375-volt input, 170-volt output experimental circuit was demonstrated. Comparison with other configurations is also given. This configuration provides an attractive option for high-efficiency, low-noise, low-profiled and high-output-voltage DC-DC power conversion for application such as a plasma or a light-emitting diode display unit.