具漏電感能量回收之交錯型返馳式LED驅動器

An Interleaved Flyback-Typed LED Driver with Energy Recovery of Leakage Inductance

蘇培碩(Pei-Shuo Su)

指導教授 ： 鄭宏良

義守大學/電機資訊學院/電機工程學系/碩士(2017年)

摘要

本文提出具漏電感能量回收之交錯型返馳式轉換器，整體電路由兩組返馳式轉換器組成，轉換器使用金屬氧化物半導體場效電晶體(MOSFET)作為主動開關
。不需要增加元件即能使電流流經主動開關之本質二極體，使主動開關操作於零電壓切換導通，提升整體電路轉換效率，並在兩組返馳轉換器開關的汲極各加一顆旁路二極體，使開關在切換時能分流由漏感能量所造成的突波能量並將此能量傳送至電容儲存，達到能量回收之目的。因交錯型轉換器之特性，輸出電壓漣波較傳統返馳式轉換器低。
本文詳細分析整體電路之工作模式，推導電路方程式並設計電路參數，最後實際製作一200W之雛形電路並點亮LED負載，以驗證所提新型電路之可行性。由實驗結果顯示，主動開關確實操作於零電壓切換導通，能有效地減少開關損失。整體轉換效率可達到95.1%。

關鍵字

漏電感能量回收 ； 交錯型返馳式轉換器 ； 零電壓切換導通

並列摘要

This thesis proposes an interleaved flyback-typed LED driver with energy recovery of leakage inductance. The proposed circuit was composed of two flyback converters with two power MOSFETs as the active switches. Without adding any components to the converters, the current can flow through the active switch’s body diode, leading to zero-voltage switching-on (ZVS), and hence improving the overall efficiency. By add bypass diodes to divert the energy of the leakage inductance to flow to the output capacitor, the voltage spike across the active switches can be effectively reduced. Owing to the characteristic of interleaved operation, the output voltage ripple can be lower than traditional flyback converters.
In this paper, detailed analyses on circuit operation are conducted and component parameters are designed. Finally, a 200-W prototype circuits are built to drive high-brightness LEDs for verifying the feasibility of the proposed circuit. The experimental results show that both active switches can achieve ZVS operation. Besides, the spike voltage of the active switches is effectively reduced. The overall efficiency is 95.1% at rated power operation.

並列關鍵字

Energy Recovery of Leakage Inductance ； Interleaved flyback converter ； Zero-Voltage Switching-on (ZVS)

參考文獻

[13] 蘇鵬宇，“零電壓切換導通之交錯式返馳轉換器”義守大學電機工程學系碩士論文，2014。

[2] R. Xinbo, and F. Liu, “An improved ZVS PWM full-bridge converter with clamping diodes,” in Proc. IEEE Power Electron. Spec. Conf, 2004, pp. 1476–1481.

[4] C. M. Wang, “A novel zero-voltage-switching PWM boost rectifier with high power factor and low conduction losses,” IEEE Trans. Ind. Electron, vol. 52, no. 2, pp. 427–435, Apr. 2005.

[5] A. Acik and I. Cadirci, “Active clamped ZVS forward converter with soft-switched synchronous rectifier for high efficiency, low output voltage applications,” Proc. Inst. Electr. Eng.—Electr. Power Appl., vol. 150, no. 2, pp. 165–174, Mar. 2003.

[6] C. M. Duarte and I. Barbi, “An improved family of ZVS-PWM activeclamping DC-to-DC converters,” IEEE Trans. Power Electron, vol. 17, no. 1, pp. 684–691, Jan. 2002.