- 學位論文
新型LED投射燈電子照明驅動電路
A Novel Electronic Lighting Driver For Supplying An LED Projection Lamp
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摘要
投射燈的傳統光源採用鹵素燈，具有高亮度的優點，但其發光效率不佳且耗能。發光二極體(Light-Emitting Diode, LED)具有高發光效率與節能的特點，可以作為投射燈的新型光源。一般應用於LED投射燈之驅動電路為兩級架構，第一級為具功因校正功能之交流轉直流轉換器，第二級為具有調節燈管電壓與電流的直流轉直流諧振轉換器。然而兩級式驅動電路架構的功率開關與元件數目較多，且能量經過兩級功率轉換導致電路效率不高。 有鑒於此，本論文提出了一種具功因校正與柔性切換功能之LED投射燈電子照明驅動電路，主電路架構整合具功因校正功能之改良型堆疊雙升壓型轉換器與半橋式LLC諧振轉換器所組成單級式功率轉換電路。且設計改良型堆疊雙升壓型轉換器的電感操作在不連續導通模式(Discontinuous Conduction Mode, DCM)，使驅動電路具有功因校正的功能。此外，LED投射燈電子照明驅動電路的兩個功率開關具有柔性切換的特性，可降低功率開關的切換損失。本論文已完成具功因校正功能的單級LED投射燈電子照明雛型驅動電路，且在交流輸入電壓有效值為110伏特時，實測雛型電路具有高功因(PF>0.98)、低輸入電流總諧波失真因數(THD<6%)以及高效率(>89%)，且功率開關具有柔性切換的特點。
並列摘要
The traditional light source of projection lamp adopts halogen lamp, which has the advantages of high brightness, but its luminous efficiency is not good and consumes energy. Light-emitting diode (LED) has the characteristics of high luminous efficiency and energy saving, and can be used as a new light source for projection lamps. The conventional two-stage electronic lighting driver for supplying an LED projection lamp is composed of an AC-DC converter with power-factor-correction (PFC) as the first stage, and a DC-DC converter for adjusting lamp voltage and current as the second stage. The conventional LED projection lamp driver has more circuit components, higher cost and limited efficiency. Therefore, this thesis proposes a novel electronic lighting driver for supplying an LED projection lamp with PFC function, which integrates a modified stacked boost converter and a half-bridge LLC resonant converter into a single-stage power-conversion circuit. The inductor inside the modified stacked boost converter are designed to operate at discontinuous conduction mode (DCM) for the driver circuit achieving PFC. Besides, soft-switching is achieved in the proposed LED projection lamp driver to lower the switching losses of power switches. This thesis has completed single-stage prototype driver for an LED projection lamp with PFC function, and the prototype circuit has a high power factor (PF>0.98), low input current total-harmonic-distortion (THD<6%) and high efficiency (>89%) in the case of an AC input power supply with an RMS value of 110 volts, and both power switches have the characteristics of soft switching.
參考文獻
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