A capacitor-free driving stage for light emitting diodes

Q4 Energy
F. Himmelstoss, M. Windisch
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引用次数: 0

Abstract

Electrolytic capacitors have the disadvantage of pronounced aging. Non-electrolytic capacitors are therefore used in applications where long-life is important. In this paper we present a driving stage for LEDs without any capacitive elements. The basic topology is a Buck converter with one coil, one active, and one passive switch. Instead of the output capacitor, series connections of one or more LEDs and an active switch are connected. An additional diode is connected between the output and the input to achieve a current path, when all LEDpaths are off. A nonlinear hysteresis controller is used to achieve a robust control. A system with three switchable LED-strings is analyzed. Design hints are given and the function is proved with the help of LTSpice simulations. The system can be used for lighting purposes with the possibility to change the chrominance. The potentiality to transmit data is also treated.
一种用于发光二极管的无电容驱动级
电解电容器的缺点是老化明显。因此,非电解电容器用于要求长寿命的应用中。本文提出了一种无电容元件的led驱动级。基本拓扑结构是一个Buck变换器,有一个线圈、一个有源和一个无源开关。代替输出电容,串联连接一个或多个led和一个有源开关。当所有led路径关闭时,在输出和输入之间连接一个额外的二极管以实现电流路径。采用非线性迟滞控制器实现鲁棒控制。分析了具有三个可切换led串的系统。给出了设计提示,并通过LTSpice仿真验证了该功能。该系统可用于照明目的,并有可能改变色度。传输数据的可能性也被处理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Renewable Energy and Power Quality Journal
Renewable Energy and Power Quality Journal Energy-Energy Engineering and Power Technology
CiteScore
0.70
自引率
0.00%
发文量
147
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