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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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

Received: 01 December 2017 Published: 29 January 2019

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TM46

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	Tian Hanlei
	Liu Junfeng
	Zeng Jun
	Liang Guozhuang

Cite this article:

Tian Hanlei,Liu Junfeng,Zeng Jun等. A Constant Frequency Resonant Multi-Channel LED Driver Based on Switch-Controlled Capacitor[J]. Transactions of China Electrotechnical Society, 2019, 34(2): 286-295.

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

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