| 基于LLC谐振拓扑的均流可调光LED驱动电路研究 |
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| 引用本文： | 薛 帅. 基于LLC谐振拓扑的均流可调光LED驱动电路研究[J]. 电子器件, 2020, 43(2): 359-365 |
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| 作者姓名： | 薛 帅 |
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| 作者单位： | 山西省电气传动及物联网工程研究中心 |
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| 基金项目： | 山西省“1331工程”项目(SC19100026山西省教育厅、财政厅);山西省电气传动及物联网工程研究中心项目(山西省发改委);基于《物联网技术及应用》的研究生协同创新研究平台研究项目(2017JG25山西省研究生教改项目)。 |
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| 摘 要： | 为解决多路并联LED灯串均流问题,提出一种基于电容容抗平衡和电容安秒平衡的新型谐振式均流拓扑结构。详细介绍了该拓扑结构的具体均流原理,并对其进行建模分析,给出关键参数的计算公式;结合LED负载特殊的工作特性,设计了相应的闭环控制策略和PWM调光电路。通过MATLAB搭建电路模型并研制一款功率为38 W,每路工作电流为350 mA的四路输出实验样机,仿真及实验结果表明新型拓扑具有很好的均流效果,可实现PWM精确调光,验证了理论分析的正确性。
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| 关 键 词： | 谐振式均流拓扑 容抗平衡 建模分析 闭环控制 PWM精确调光 |
Research on Current Sharing LED Driver Circuit with Individual Dimming Based on LLC Resonant Topology |
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| XUE Shuai,ZHANG Junchao,HOU Rui,ZHANG Xinyu. Research on Current Sharing LED Driver Circuit with Individual Dimming Based on LLC Resonant Topology[J]. Journal of Electron Devices, 2020, 43(2): 359-365 |
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| Authors: | XUE Shuai ZHANG Junchao HOU Rui ZHANG Xinyu |
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| Affiliation: | (Engineering Research Center of Electric Drive and IoT in Shanxi,Taiyuan 030024,China;Taiyuan University of Technology,College of Electrical and Power Engineering,Taiyuan 030024,China;Shanxi Province“1331 Project”Smart City Lighting Data Sharing and Public Service Platform Engineering Technology Research Center Based on Big Data,Taiyuan 030024,China;Taiyuan University of Technology,College of Software Engineering,Taiyuan 030024,China) |
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| Abstract: | In order to solve the current sharing problem when LED strings are paralleled,a novel resonant current sharing topology based on the principle of capacitive impedance balance and capacitor ampere-second balance is proposed. The specific current sharing principle of the new resonant topology is introduced in detail and its performance is modeled and analyzed,based on which,the calculation formula of key parameters are given;combined with the special working characteristics of the LED load,the corresponding closed-loop control strategy and PWM dimming circuit are designed. The circuit model was built by MATLAB and a 38 W four-channel output experimental prototype with 350 mA/channel was developed,the simulation and experimental results show that the new topology has a good current sharing effect,and the pulse-width modulation(PWM)dimming can be incorporated easily,which verified the correctness of theoretical analysis. |
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| Keywords: | resonant current sharing topology capacitive impedance balance modeling analysis closed-loop control PWM precise dimming |
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