基于可控开关电容的定频谐振式多路LED均流驱动器

doi:10.19595/j.cnki.1000-6753.tces.171634

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摘要

多路LED并联可造成电流不均衡,利用电容阻抗匹配的均流方案因控制简单、易扩展而得到广泛应用,但伴随路数增加,均流效果锐减、无功损耗增大。同时,传统LED驱动常采用脉冲频率调制（PFM）,从而造成高电磁干扰（EMI）的风险。基于此提出一种LED定频均流驱动拓扑,利用其上、下半桥叠加输出,缓解由容抗不匹配造成的均流失效及额外损耗,同时利用谐振单元中可控开关电容（SCC）模块完成定频控制下的LED大范围调光。LED驱动器中开关电路采用PWM,且均可实现软开关,转化效率高。设计12W的实验样机,实现四路LED均流调光,验证了所提LED驱动器的可行性。

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	田涵雷
	刘俊峰
	曾君
	梁国壮

关键词 ：恒频, 可控开关电容, 软开关, 多路均流, 谐振, LED调光

Abstract：

The current sharing scheme of capacitive impedance matching has been widely used to eliminate current imbalance duo to simple control versus easy expansion. However, as the number of strings increases, the current sharing effect decreases, and the reactive loss increases. At the same time, traditional topologies using pulse frequency modulation (PFM) are bound to cause high electro magnetic interference (EMI). In this paper, a novel LED driver with the current sharing is proposed under constant frequency operation. The proposed converter can be derived by upper and lower half-bridge interleaved output, which greatly alleviates the unbalance of multiple LED and loss caused by capacitive mismatch. Meanwhile, LED wide range dimming with the constant frequency is achieved by using the switch-controlled capacitor (SCC) module of the resonant unit. Since the switching circuit adopts PWM and can realize soft-switching, the conversion efficiency of the machine is high. Finally, experimental prototype of 12W was designed to realize 4-channel LED current-sharing dimming, which verified the feasibility of the LED driver.

Key words： Constant frequency switch-controlled capacitor soft-switching multi-channel current sharing resonant LED dimming

收稿日期: 2017-12-01 出版日期: 2019-01-29

PACS:

TM46

基金资助:

国家自然科学基金（61573155）,广东省自然科学基金（No.2016A030313508）和广东省科技计划（No.2016A010102007）资助项目

通讯作者: 刘俊峰男,1978年生,副教授,硕士生导师,研究方向为电力电子及其控制技术。E-mail: aujfliu@scut.edu.cn

作者简介: 田涵雷男,1992年生,硕士研究生,研究方向为LED照明驱动技术。E-mail: THLedu@163.com

引用本文:

田涵雷, 刘俊峰, 曾君, 梁国壮. 基于可控开关电容的定频谐振式多路LED均流驱动器[J]. 电工技术学报, 2019, 34(2): 286-295. Tian Hanlei, Liu Junfeng, Zeng Jun, Liang Guozhuang. A Constant Frequency Resonant Multi-Channel LED Driver Based on Switch-Controlled Capacitor. Transactions of China Electrotechnical Society, 2019, 34(2): 286-295.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.171634 https://dgjsxb.ces-transaction.com/CN/Y2019/V34/I2/286

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