NDLI: Multi-channel constant current $(MC^{3})$ LLC resonant LED driver

Content Provider	IEEE Xplore Digital Library
Author	Haoran Wu Shu Ji Lee, F.C. Xinke Wu
Copyright Year	2011
Description	Author affiliation: College of Electrical Engineering, Zhejiang University, Hangzhou, 310027 China (Xinke Wu) \|\| Center for Power Electronics Systems, Virginia Polytechnic Institute and State University, Blacksburg, 24061 USA (Haoran Wu; Shu Ji; Lee, F.C.)
Abstract	Multi-channel LED drivers are required in many applications, such as display backlighting, indoor lighting and street lighting. The LED driver should have the capability of providing multiple constant current source regardless to the LED forward voltage variations. Moreover, how to achieve current sharing between multiple LED channels is also challengeable in these applications. In this paper, a multi-channel constant current $(MC^{3})$ LLC resonant LED driver is proposed. The LLC converter is controlled to operate as a constant current mode LED driver. By employing the multiple transformer structure, one single-stage driver can drive multiple LED channels, simplifying the driving scheme and circuit complexity. A DC block capacitor is utilized to balance the currents between two LED channels driven by the same transformer. After considering LED's i-v characteristic, the LLC current gain characteristic is proposed and derived to describe a LLC converter with current-controlled output. Instead of constant resistive load considered in LLC voltage gain characteristic derivation, a non-linear LED load is modeled and used in AC equivalent circuit to derive LLC current gain characteristic. A design methodology for $MC^{3}$ LLC LED driver has been developed based on the proposed LLC current gain characteristic. A 100kHz, 200W, 4-channel $MC^{3}$ LLC LED driver is designed and simulated to verify the proposed circuit and design method.
Starting Page	2568
Ending Page	2575
File Size	522821
Page Count	8
File Format	PDF
ISBN	9781457705427
e-ISBN	9781457705410
DOI	10.1109/ECCE.2011.6064111
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-09-17
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Resistance Resistors Switching frequency Capacitors Lighting Light emitting diodes Integrated circuit modeling
Content Type	Text
Resource Type	Article

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