應用於獵能系統之使用閉迴路零電流切換控制技術的返馳式轉換器

基於目前消費性電子產品已佔據人們生活中不可或缺的地位，但此類產品卻需要考量電池續航力的問題。專家因而研發出獵能系統，主要概念是從週遭環境收集外部能量轉換成電力，再將電力供應於電子商品以解決電池續航力的問題。本研究針對獵能系統研製出以返馳式轉換器為主架構的儲能電路，研究之重點為設計一個可工作於微弱且不穩的電力供應之低功率消耗的電力轉換電路，來有效萃取、轉換與儲存電能。此電路使用閉迴路零電流切換控制技術，使控制迴路能以數位元件實現，以降低電路的功率消耗和複雜度，更可以讓返馳式轉換器的電路狀態操作於變頻非連續模式，以降低功率電晶體的切換損失；此技術搭配返馳式轉換器來做升壓動作能藉由變壓器儲能與釋能的特性，實現高轉換比的升壓電路。本論文所提出的使用閉迴路零電流切換控制技術的返馳式轉換器電路設計，採用TSMC 0.18μm 1P6M CMOS製程實現，晶片面積為1.34 x 1.48mm2(含PADs)。

關鍵字

獵能系統；返馳式轉換器；閉迴路零電流切換控制技術

並列摘要

This paper presents an improved structure of flyback converter for energy harvesting systems. By the closed-loop zero-current-switching-controlled technique, the control circuit of this proposed flyback converter can be implemented using all-digital circuits. It not only can reduce quiescent currents and the complexity of circuits, but also can make the flyback converter operate in variable-frequency discontinuous-conduction mode which has higher efficiency in light load situation. The flyback converter can boost the output voltage which is 90 times higher than the input voltage by adjusting the turn ratio of the transformer. The simulation results show that the output voltage can accurately achieve 1.8V when the input voltage range is from 20mV to 300mV. The conversion efficiency of this proposed converter can achieve 90%. The chip area is 1.34 x 1.48mm2.

並列關鍵字

Energy harvesting system ； flyback converter ； Closed-Loop zero-current-switching-controlled technique

參考文獻

[13] 張建智，獵能系統之升壓型電荷泵轉換電路設計與實現，國立交通大學電機與控制工程系所，碩士論文，2008。

[1] E. J. Carlson, K. Strunz, and B. P. Otis, “A 20 mV Input Boost Converter with Efficient Digital Control for Thermoelectric Energy Harvesting,” IEEE J. Solid-State Circuits, vol. 45, no. 4, pp. 741-750, Apr. 2010.

[2] C. F. Lee and P. K. T. Mok, “A Monolithic Current-Mode CMOS DC-DC Converter with On-Chip Current-Sensing Technique,” IEEE Journal Solid-State Circuits, vol. 39, no. 12, pp. 3-14, Jan. 2004.

[3] Y. S. Hwang, M. S. Lin, B. H. Hwang, and J. J. Chen, “A 0.35μm CMOS Sub-1V Low-Quiescent-Current Low-Dropout Regulator,” in Proc. Asian Solid-State Circuits Conference, Nov. 2008, pp. 153-156.

[4] M. Siu, P. K. T. Mok, K. N. Leung, Y. H. Lam, and W. H. Ki, “A Voltage-Mode PWM Buck Regulator with End-Point Prediction,” IEEE Trans. Circuits and Systems II, Express Briefs, vol. 53, no. 4, pp. 294-298, Apr. 2006.

國際替代計量

應用於獵能系統之使用閉迴路零電流切換控制技術的返馳式轉換器

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