NDLI: Turn-On Optimization for Class D Series–Parallel <italic>LCC</italic>-Type Constant Current High-Power LED Driver Design Based on Traditional Fluorescent Control IC

Content Provider	IEEE Xplore Digital Library
Author	Keng Chen Peng Xiao Johnsen, A. Saenz, R.E.
Copyright Year	1986
Abstract	This research investigated a method to optimize the start-up performance of a dimmable light-emitting diode (LED) driver based on half-bridge Class D series-parallel LCC topology. This LED driver is designed for outdoor or high bay applications with 347-480 V_ac input voltage. The total maximum output power is 100 W with a wide tunable output current range (from 50 to 800 mA). The wide load range makes it difficult to achieve a start-up time of less than 1 s under each load condition as well as limit the output overshoot level to below 150% by implementing only one set of KI values in the feedback loop. Moreover, in this design, a fluorescent control IC is used due to the cost efficiency of repurposing existing fluorescent ballast manufacturing systems. The start-up sequence of the fluorescent control IC introduces an additional challenge to the start-up design. In order to comply with Energy Star, which requires the output current to reach 75% of its nominal value and also limit the overshoot level, a self-adjusted-duty-cycle control algorithm is designed. This duty-cycle signal generated by measuring the load condition through a secondary side microcontroller is used to determine the switching frequency of the LCC tank. With this method, the start-up performance is greatly improved and meets all requirements.
Sponsorship	IEEE Power Electronics Society
Starting Page	4732
Ending Page	4741
Page Count	10
File Size	1515213
File Format	PDF
ISSN	08858993
Volume Number	31
Issue Number	7
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Light emitting diodes Integrated circuits Fluorescence Topology Switching frequency Capacitors RLC circuits start-up Class D series-parallel LCC LED driver overshoot constant current start up Class D series–parallel light-emitting diode (LED) driver
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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