A Constant Frequency Resonant Multi-Channel LED Driver Based on Switch-Controlled Capacitor
Tian Hanlei1, Liu Junfeng2, Zeng Jun2, Liang Guozhuang1
1. School of Electrical Engineering Hebei University of Science and Technology Shijiazhuang 050080 China;
2. College of Electric Power South China University of Technology Guangzhou 510640 China
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.
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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2019, Vol. 34 
