應用於LED驅動之具新型同步整流之雙晶多組輸出返馳式轉換器

Applying Novel Synchronously-Rectified Two-Transistor Mutiple-Output Flyback Converter to LED Drive

林聖展(Sheng Chan Lin)

指導教授 ： 胡國英

國立臺北科技大學/電資學院/電機工程系研究所/碩士(2012年)

摘要

本論文係研製一具新型同步整流之雙晶多組輸出返馳式轉換器，利用二次側之特殊同步整流電路，將較高輸出電壓沒消耗在輸出負載之功率，經由疊加式同步整流技術回送至較低輸出電壓上，使得多組輸出之各組電壓，只與各繞組之圈數成正比，不因各負載在彼此輕重載交錯變動下，產生電壓準位偏移過多而造成電壓調整率(Cross Regulation)過大之問題，同時在一次側主功率開關兼具有零電壓切換(Zero Voltage Switching, ZVS)。並藉由應用在LED TV之電源供應器的實驗，利用所提之架構，供給多組輸出負載與LED負載，得以免去傳統應用上還特別加入專門為了控制LED電流需求之非隔離式升壓轉換器，來提升LED TV之電源供應器的整體效率與節省非隔離式升壓轉換器之用料成本，藉此來驗證所提架構之可行性與有效性。

關鍵字

重疊式同步整流技術 ； 雙晶多組輸出返馳式轉換器 ； 零電壓切換 ； 非隔離式升壓型轉換器 ； 電壓調整率

並列摘要

In this thesis, a novel synchronously-rectified two-transistor multiple-output Flyback converter is presented, which is applied to driving the LED. Based on the proposed synchronous rectifiers stacked with each other on the primary side, the power, which is not dissipated in the load at the high output voltage terminal, will be pumped to the load at the low output voltage terminal, so as to make output voltages proportional to individual turns ratios regardless of variations in load. By doing so, the cross regulation between output voltages will be reduced as minimum as possible. Moreover, the main switch on the primary side will possess zero voltage switching (ZVS). By applying this converter to feeding the multiple loads of the LED TV, one non-isolated boost converter, traditionally required to control the LED current, will be removed such that the required components will be reduced and the efficiency of the power supplies for the LED TV will be upgraded. By means of some experimental results, the effectiveness of the proposed topology can be verified.

並列關鍵字

Synchronous Rectifiers Stacked ； Two-Transistor Multi-Output Flyback Converter Zero Voltage Switching ； Non-Isolated Boost Converter ； Cross Regulation

參考文獻

[1] B. Sharifipour, P. Cacciola and J. Maddox, “Designing a 1200 watt multiple output modular power system with high power utilization for the workstation environment,” IEEE APEC’89, pp. 439-444, 1989.

[2] Z. Pan, F. Zhang and F. Z. Peng, “Power losses and efficiency analysis of multilevel DC-DC converters,” IEEE APEC’05, pp. 1393-1398, 2005.

[4] Faisal H. Khan and Leon M. Tolbert, “Multiple-load-source integration in a multilevel modular capacitor-clamped DC–DC converter featuring fault tolerant capability,” IEEE Transactions on Power Electronics, vol. 24, no. 1, pp. 14-24, 2009.

[5] F. H. Khan and L. M. Tolbert, “A multilevel modular capacitor clamped DC-DC converter,” IEEE IAS Annual Meeting’06, vol. 2, pp. 966-973, 2006.

[6] Faisal H. Khan and Leon M. Tolbert, “Generating isolated outputs in a multilevel modular capacitor clamped dc-dc converter (MMCCC) for hybrid electric and fuel cell vehicles,” IEEE PESC’08, pp. 967-973, 2008.