無橋式單級高功因LED驅動電路設計

本文提出一無橋式單級高功因LED驅動電路，其電路由無橋式升壓型轉換電路與全橋式轉換電路結合所衍生而成，此電路減少傳統轉換器所使用橋式整流二極體數量，可由根本上降低二極體所帶來導通損失與成本。控制方式採用不對稱脈波寬度調變技術進行控制與調光，此技術可有效解決直流鏈電壓為因應功率平衡而升高之問題。功因修正電感電流則操作在不連續導通模式，可具較低的電感值與簡單控制之特性。所提出之電路具有零電壓切換特性，可減少主動開關所切換時造成的損失，以提升整體電路效率；並應用諧振電容與變壓器漏電感進行諧振，使後方輸出二極體具零電流切換之性能。最後本文實際設計與製作一150W(150V/1A)雛型電路以驗證本文之推論與可行性。經實驗結果顯示，本文所提出之電路滿載轉換效率為93.60%，最高轉換效率為94.44%；功率因數可高達0.99；並具全域調光，其具零電壓切換之調光範圍為總功率輸出的7.5%-100%。

關鍵字

發光二極體；無橋式；單級轉換器；零電壓切換；零電流切換；不對稱脈寬調變

並列摘要

This thesis presents a bridgeless single-stage high power-factor LED driving circuit, which evolves from a bridgeless boost-type converter and a full-bridge converter. The number of diode can be reduced with cost saving as well as conduction loss decrease being followed. The dimmer was controlled based on asymmetrical pulse width modulation which can avoid the DC link voltage rising problem accompanied by power regulation. The developed circuit will operate in discontinuous conduction mode to decrease size of inductance and attain easy control feature. With the introduction of zero-voltage-switching technique, the switching losses of active switches can be reduced and circuit operating efficiency can be enhanced. The design of resonance between transformer leakage inductance and resonant capacitor further equip the diodes with zero-current-switching characteristics. In the end, 150W(150V/1A) prototype circuit is designed and developed to validate the theoretical derivation and availability of this study. From practical measurement, full-load efficiency is 93.60% while maximum efficiency reaches 94.33%. The practical measurements disclose the power factor could reach 0.99. The dimming range covers 7.5%-100% rated output power with ZVS performance.

並列關鍵字

Light-Emitting Diode ； bridgeless ； single-stage converter ； zero-voltage-switching ； zero-current-switching ； asymmetrical pulse width modulation

參考文獻

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[22]H. M. Huang, S. H. Twu, S. J. Cheng, and H. J. Chiu, 2008, “A Single-Stage SEPIC PFC Converter for Multiple Lighting LED Lamps”, the 4th IEEE International Symposium on Electronic Design, Test and Applications., pp. 15-19, Jan.

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[2]J. Alonso, J. Vina, D. Gacio, G. Martinez, and R. Osorio Sanchez, 2011,“Analysis and design of the integrated double buck-boost converter as a high-power-factor driver for power-LED lamps”, IEEE Trans. Ind. Electron., vol. 59, no. 4, pp. 1689–1697, Apr.

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無橋式單級高功因LED驅動電路設計

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