- 學位論文
具有新型零電流偵測之脈波頻率調變升壓轉換器的設計與實現
Design and Implementation of PFM Boost Converter with a Novel Zero Current Detector
摘要
隨著科技日新月異和工業發展迅速，對能源的需求越來越大，節約現有能源及提高電能的轉換效率即成為照明設計上重要的課題。本文提出新型零電流偵測電路結合脈波頻率調變控制技術，可應用於驅動發光二極體的高效率直流轉直流升壓轉換器。 所提出的直流轉直流升壓轉換器驅動電路，採用電流模式脈波頻率調變(Current Mode PFM)為基礎電路架構，並以金氧半場效應電晶體取代傳統整流二極體，大幅降低導通電阻和導通損失，使轉換器能有較佳電能轉換效率，並提出一個新型零電流偵測電路，有效解決電感電流下降至零以下所造成的功率損失，進而提高升壓轉換器之電能轉換效率。論文中所提出的升壓式直流轉直流轉換器，使用台灣積體電路製造股份有限公司的0.18um 1P6M CMOS 3.3V 製程來設計。能將1.8V輸入電壓升壓至3.5V的輸出電壓，在負載電流1mA~100mA操作下，其電能轉換效率均大於81%，當負載電流為50mA時，最大效率為87%。與傳統零電流偵測電路做比較，在負載電流為1 mA時，電能轉換效率改善了19%。故所提出的升壓轉換器具有高效率，非常適用於發光二極體應用上。
並列摘要
With the rapid developments of science and technology, power saving and high power conversion efficiency have become important designs in the lighting systems. This thesis proposes high power conversion efficiency PFM boost converter with a novel zero current detector for driving LED lightings. The proposed PFM boost converter uses two power MOS transistors to replace the rectification diodes. Hence, the conduction loss and power conversion efficiency can get a good improvement. A novel zero current detector is proposed to completely eliminate the reverse current loss and successfully raise power conversion efficiency. The proposed boost converter is designed with a standard TSMC 0.18μm 1P6M CMOS technology. The proposed boost converter can regulate a 1.8V supply voltage to 3.5V under 1-100mA loads. The maximum power-conversion efficiency is 87%. The proposed boost converter has 19% higher power-conversion efficiency than the conventional technique at 1mA load current. Therefore, the proposed high efficiency boost converter with a novel zero current detector is suitable for LED applications.