單開關串接式高升壓直流-直流轉換器之研製

本文設計了一應用於鋰電池上之新型DC-DC高增益轉換器。高電壓增益轉換器可以用在各種可攜帶式儲能元件上，例如動力系統是使用鋰電池的混合動力電動車與輕型電動車等等。其中本轉換器是藉由結合升壓電路、返馳電路、倍壓電容、主動箝位電路及耦合電感的技術達到高電壓增並且具有下列優點：(一)電路架構僅需單組脈波寬度調變訊號(PWM)做控制；(二)其中包含主動箝位電路，因此儲存在耦合電感中的漏感能量可以被回收並傳送至輸出電容，因此開關上之電壓應力可以降低，整體效率也得到改善；(三)藉由使用第二級升壓電路的電感繞組及倍壓電容的技術，開關在不用超過50%的導通週期下也能達到高電壓增益，因此可以簡化斜率補償電路。最後實現了所提出的轉換器之原型，並對其性能進行驗證，使用輸出電壓設為400V，輸出功率1k W之規格。當輸入電壓為48V，最高效率在400W時為92.96%，滿載時的效率為90.48%；當輸入電壓為70V，最高效率在800W時為96.18%，滿載時的效率為95.94%。

關鍵字

高電壓增益；耦合電感；箝位電路；倍壓電容

並列摘要

A novel high step-up DC-DC converter has been designed for fuel cell applications. The proposed converter can be used for various portable energy storage components, such as fuel cells, which can be used for hybrid electric vehicles (HEV), and light electric vehicles (LEV). The proposed converter consists of boost circuit, flyback circuit, voltage-lift capacitor, active clamped circuit and coupled-inductor techniques to achieve high step-up voltage. First, the circuit is controlled by one single pulse width modulation (PWM). Second, the converter exploits active clamp circuit to recycle the leakage inductance and send to output capacitor. The voltage spike on active switch is suppressed and efficiency is also improved. Third, by using the winding of secondary boost circuit, and voltage-lift capacitor techniques, the high voltage gain can be achieved without more than 50% duty ratio, and the slope compensation circuit can also be simplified. Finally, a prototype converter is implemented and verified the performance, the output voltage is set to 400V and the output power is 1k W. When Vin = 48V the maximum efficiency is 92.96% at 400 W and the full-load efficiency is 90.48%; when Vin = 70V the maximum efficiency is 96.18% at 800 W and the full-load efficiency is 95.94%.

並列關鍵字

High voltage gain ； Coupled-inductor ； Clamp circuit ； Voltage-lift capacitor

參考文獻

[1]C. C. Chan, “The past, present and future of electric vehicle development,” Power Electronics and Drive Systems, 1999. Proceedings of the IEEE International Conference on, 1999.

[2]K. C. Tseng and T. J Liang, “Novel high-efficiency step-up converter,” Electric Power Applications, IEE Proceedings, 151(2), 182-190, 2004.

[3]T. J Liang and K. C. Tseng, “Analysis of integrated boost-flyback step-up converter,” Electric Power Applications, IEE Proceedings, 152(2), 217-225, 2005.

[4]R. J. Wai and R. Y. Duan, “High step-up converter with coupled-inductor. Power Electronics, IEEE Transactions on, 20(5), 1025-1035, 2005.

[5]R. J. Wai, L. W. Liu and R. Y. Duan, “High-efficiency Voltage-clamped DC-DC converter with reduced reverse-recovery current and switch-Voltage stress,” Industrial Electronics, IEEE Transactions on, 53(1), 272-280, 2006

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單開關串接式高升壓直流-直流轉換器之研製

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