Capacitor-isolated structure with brightness and color controlling for multicolor LED strings

Ruihong Zhang; Henry Shu-hung Chung; Xuanlyu Wu; Xiaohua Wu; Xiaobin Zhang; Jinrong Wang

doi:10.1109/ECCE.2017.8096525

Capacitor-isolated structure with brightness and color controlling for multicolor LED strings

Ruihong Zhang^*
, Henry Shu-hung Chung^*
, Xuanlyu Wu
, Xiaohua Wu
, Xiaobin Zhang
, Jinrong Wang

^*Corresponding author for this work

Centre for Smart Energy Conversion and Utilization Research

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

2 Citations (Scopus)

Abstract

A capacitor-isolated structure with brightness and color controlling for multicolor LED strings is proposed. Such structure mainly plays the role of currentbalancing and color mixing. Moreover, in order to decrease the color shift, the current amplitude of LED strings is controlled constant. The luminous flux and chromaticity coordinates are regulated through controlling the sum and ratio of duty cycles respectively. The capacitors in the structure have three functions: currentbalancing, galvanic isolation and resonant. The proposed topology have the energy-recycling function to assure that any LED string can be totally turned off which makes it possible that arbitrary chromaticity coordinates in the color gamut can be achieved. A prototype with red, green and blue strings has been built and evaluated. Experimental results show that the duty cycle of every string can be 0 to 1. The luminous flux can be from 100lm to 600lm, and its error is within ±3%. Arbitrary chromaticity coordinate within the triangle enclosed by RGB points can be realized.

Original language	English
Title of host publication	2017 IEEE Energy Conversion Congress and Exposition (ECCE)
Publisher	IEEE
Pages	2823-2830
ISBN (Electronic)	978-1-5090-2998-3
DOIs	https://doi.org/10.1109/ECCE.2017.8096525
Publication status	Published - Oct 2017
Event	9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 - Duke Energy Convention Center, Cincinnati, United States Duration: 1 Oct 2017 → 5 Oct 2017 http://www.ieee-ecce.org/2017/

Conference

Conference	9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017
Place	United States
City	Cincinnati
Period	1/10/17 → 5/10/17
Internet address	http://www.ieee-ecce.org/2017/

Research Keywords

Capacitorisolated structure
Color dimming
Color mixing
Led lighting

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10.1109/ECCE.2017.8096525

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@inproceedings{ac222aaeb91b45e3a5ff381d98fdc2c5,

title = "Capacitor-isolated structure with brightness and color controlling for multicolor LED strings",

abstract = "A capacitor-isolated structure with brightness and color controlling for multicolor LED strings is proposed. Such structure mainly plays the role of currentbalancing and color mixing. Moreover, in order to decrease the color shift, the current amplitude of LED strings is controlled constant. The luminous flux and chromaticity coordinates are regulated through controlling the sum and ratio of duty cycles respectively. The capacitors in the structure have three functions: currentbalancing, galvanic isolation and resonant. The proposed topology have the energy-recycling function to assure that any LED string can be totally turned off which makes it possible that arbitrary chromaticity coordinates in the color gamut can be achieved. A prototype with red, green and blue strings has been built and evaluated. Experimental results show that the duty cycle of every string can be 0 to 1. The luminous flux can be from 100lm to 600lm, and its error is within ±3\%. Arbitrary chromaticity coordinate within the triangle enclosed by RGB points can be realized.",

keywords = "Capacitorisolated structure, Color dimming, Color mixing, Led lighting",

author = "Ruihong Zhang and Chung, \{Henry Shu-hung\} and Xuanlyu Wu and Xiaohua Wu and Xiaobin Zhang and Jinrong Wang",

year = "2017",

month = oct,

doi = "10.1109/ECCE.2017.8096525",

language = "English",

pages = "2823--2830",

booktitle = "2017 IEEE Energy Conversion Congress and Exposition (ECCE)",

publisher = "IEEE",

address = "United States",

note = "9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017 ; Conference date: 01-10-2017 Through 05-10-2017",

url = "http://www.ieee-ecce.org/2017/",

}

Zhang, R, Chung, HS, Wu, X, Wu, X, Zhang, X & Wang, J 2017, Capacitor-isolated structure with brightness and color controlling for multicolor LED strings. in 2017 IEEE Energy Conversion Congress and Exposition (ECCE)., 8096523, IEEE, pp. 2823-2830, 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017, Cincinnati, Ohio, United States, 1/10/17. https://doi.org/10.1109/ECCE.2017.8096525

Capacitor-isolated structure with brightness and color controlling for multicolor LED strings. / Zhang, Ruihong; Chung, Henry Shu-hung; Wu, Xuanlyu et al.
2017 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2017. p. 2823-2830 8096523.

Research output: Chapters, Conference Papers, Creative and Literary Works › RGC 32 - Refereed conference paper (with host publication) › peer-review

TY - GEN

T1 - Capacitor-isolated structure with brightness and color controlling for multicolor LED strings

AU - Zhang, Ruihong

AU - Chung, Henry Shu-hung

AU - Wu, Xuanlyu

AU - Wu, Xiaohua

AU - Zhang, Xiaobin

AU - Wang, Jinrong

PY - 2017/10

Y1 - 2017/10

N2 - A capacitor-isolated structure with brightness and color controlling for multicolor LED strings is proposed. Such structure mainly plays the role of currentbalancing and color mixing. Moreover, in order to decrease the color shift, the current amplitude of LED strings is controlled constant. The luminous flux and chromaticity coordinates are regulated through controlling the sum and ratio of duty cycles respectively. The capacitors in the structure have three functions: currentbalancing, galvanic isolation and resonant. The proposed topology have the energy-recycling function to assure that any LED string can be totally turned off which makes it possible that arbitrary chromaticity coordinates in the color gamut can be achieved. A prototype with red, green and blue strings has been built and evaluated. Experimental results show that the duty cycle of every string can be 0 to 1. The luminous flux can be from 100lm to 600lm, and its error is within ±3%. Arbitrary chromaticity coordinate within the triangle enclosed by RGB points can be realized.

AB - A capacitor-isolated structure with brightness and color controlling for multicolor LED strings is proposed. Such structure mainly plays the role of currentbalancing and color mixing. Moreover, in order to decrease the color shift, the current amplitude of LED strings is controlled constant. The luminous flux and chromaticity coordinates are regulated through controlling the sum and ratio of duty cycles respectively. The capacitors in the structure have three functions: currentbalancing, galvanic isolation and resonant. The proposed topology have the energy-recycling function to assure that any LED string can be totally turned off which makes it possible that arbitrary chromaticity coordinates in the color gamut can be achieved. A prototype with red, green and blue strings has been built and evaluated. Experimental results show that the duty cycle of every string can be 0 to 1. The luminous flux can be from 100lm to 600lm, and its error is within ±3%. Arbitrary chromaticity coordinate within the triangle enclosed by RGB points can be realized.

KW - Capacitorisolated structure

KW - Color dimming

KW - Color mixing

KW - Led lighting

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DO - 10.1109/ECCE.2017.8096525

M3 - RGC 32 - Refereed conference paper (with host publication)

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BT - 2017 IEEE Energy Conversion Congress and Exposition (ECCE)

PB - IEEE

T2 - 9th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2017

Y2 - 1 October 2017 through 5 October 2017

ER -

Capacitor-isolated structure with brightness and color controlling for multicolor LED strings

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