電池電源之可調光LED驅動電路設計

本文提出一應用於電池電源之可調光LED驅動電路。本文主要電路架構採用E類諧振換流器及串聯多組三繞組變壓器。本研究所使用之E類諧振換流器之開關具有零電壓切換(ZVS)之功能，較高輸入電壓使用率，且相較於其他換流器，E類有著較高的效率。應用於LED驅動電路之多組三繞組變壓器不僅可以提高LED驅動電壓，亦能解決均流、電氣隔離、可靠度與電流變動量。由於調光開關均可共地，因此不需要額外的隔離驅動電路，且能個別單獨操作。甚至調光繞組的電流可借由匝數比降低，加上整數波控制(ICC)技術，調光開關皆有零電流切換(ZCS)的功能，大幅降低調光時的功率損耗。本架構共驅動四組LED燈組，每串輸出7瓦共28瓦，輸入電壓則是48伏特電池電源。完成之實體電路已驗證本驅動電路具大範圍且精準的調光，實驗結果與理論是相符的。

關鍵字

E類諧振換流器；整數波控制；零電流切換；零電壓切換；發光二極體

並列摘要

In this thesis, a design of dimmable LED lighting driving circuit for battery power source is proposed. Class-E resonant inverter is used as main electric circuit architecture, in which the main power switch can not only possess Zero-Voltage Switching (ZVS) capability, but also make the fully usage of input voltage. It performs higher efficiency compared with other types of resonant inverters. The application of multiple transformers with three windings not only can step up the driving voltage for LED lighting sets, but can improve problems of current uniformity, power isolation, device reliability and resonant current variation. Dimming switches with common-ground, extra external isolated driving circuits for dimming switches are no more necessary. In addition, the turn ratio of tertiary winding can reduce the current in dimming circuit, and the use of Integral Cycle Control (ICC) technique makes the dimming switches be able to switch at zero current (Zero-Current-Switching), thus minimizing the power losses during dimming control. In this research, the proposed dimmable circuit drives 4 LED lighting sets in total, with 7W output of each set, and total of 28W output while input powered by a 48V battery power source. Wide range precise dimming control has been verified to be achievable. Finally, an actual circuit has been tested,experimental waveforms show that experimental results are in good consistency with theoretical approach.

並列關鍵字

Class-E Resonant Inverter ； Integral Cycle Control ； Zero-Current Switching (ZCS) ； Zero-Voltage Switching (ZVS) ； Light-Emitting Diode (LED)

參考文獻

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電池電源之可調光LED驅動電路設計

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