A High-Efficiency Single-Inductor Multiple-Output Buck-Type LED Driver With Average Current Correction Technique

The state-of-the-art topology of a single-inductor multiple-output light emission diode (LED) driver employs time-multiplexing (TM) control multiple parallel LED strings. The TM control technology provides large output current but the inductor current is separated to several parts and unable to be u...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 33; no. 4; pp. 3375 - 3385
Main Authors Yang, Wen-Hau, Yang, Hsiang-An, Huang, Chao-Jen, Chen, Ke-Horng, Lin, Ying-Hsi
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2018
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Average current correction (ACC) technique
Color
current cross regulation (CCR)
Dimming
Diodes
Efficiency
High voltages
Inductors
Light emission
light emission diode (LED) driver
Light emitting diodes
Luminous efficacy
Power efficiency
Pulse width modulation
single-inductor multiple floating output (SIMFO)
State of the art
Strings
Switches
Time multiplexing
Topology
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Summary:The state-of-the-art topology of a single-inductor multiple-output light emission diode (LED) driver employs time-multiplexing (TM) control multiple parallel LED strings. The TM control technology provides large output current but the inductor current is separated to several parts and unable to be used simultaneously. The limitation of TM control also results in low dimming frequency and low color resolution. Thus, a single-inductor multiple-floating-output (SIMFO) LED driver with the average current correction (ACC) technique is proposed to solve these problems, so the inductor current is simultaneously utilized by every LED in series, with enhancement of luminous efficiency. Furthermore, the proposed ACC technique adaptively adjusts the average current to eliminate the current cross-regulation effect occurring in different dimming patterns, so each different color LED has its own dimming ratio. The test chip is fabricated in a 0.5-μm high voltage (HV) process with an active area of 15 mm 2 , and experimental results show the proposed LED driver achieves 24-b color resolution with 12 W output power and maintains 96% high efficiency in the RGBW LED applications.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2017.2709039