Transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current

Ruihong Zhang; Henry Shu-Hung Chung

doi:10.1109/APEC.2014.6803485

Transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current

Ruihong Zhang
, Henry Shu-Hung Chung

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

4 Citations (Scopus)

Abstract

This paper presents a transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current. The methodology is based on connecting multiple transformers in a daisy chain to balance the string currents. To ensure service continuity of all LEDs, each LED has a bypass thyristor, which is triggered upon open-circuit failure, so that the healthy LEDs in the string would still be operated. A 21W prototype with 7 strings has been built. Each string has three 1W LEDs connected in series. Experimental results show that the LED current can still be regulated at the reference value within ±1% error even if the whole circuit has only one piece of LED in operation and all other LEDs fail short or open. © 2014 IEEE.

Original language	English
Title of host publication	Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Publisher	IEEE
Pages	1370-1377
ISBN (Print)	9781479923250
DOIs	https://doi.org/10.1109/APEC.2014.6803485
Publication status	Published - 2014
Event	29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014 - Fort Worth, United States Duration: 16 Mar 2014 → 20 Mar 2014 https://ieeexplore.ieee.org/xpl/conhome/6784523/proceeding

Conference

Conference	29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014
Place	United States
City	Fort Worth
Period	16/03/14 → 20/03/14
Internet address	https://ieeexplore.ieee.org/xpl/conhome/6784523/proceeding

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@inproceedings{b50755f6a36f46698057aaa484f67de1,

title = "Transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current",

abstract = "This paper presents a transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current. The methodology is based on connecting multiple transformers in a daisy chain to balance the string currents. To ensure service continuity of all LEDs, each LED has a bypass thyristor, which is triggered upon open-circuit failure, so that the healthy LEDs in the string would still be operated. A 21W prototype with 7 strings has been built. Each string has three 1W LEDs connected in series. Experimental results show that the LED current can still be regulated at the reference value within ±1\% error even if the whole circuit has only one piece of LED in operation and all other LEDs fail short or open. {\textcopyright} 2014 IEEE.",

author = "Ruihong Zhang and Chung, \{Henry Shu-Hung\}",

year = "2014",

doi = "10.1109/APEC.2014.6803485",

language = "English",

isbn = "9781479923250",

pages = "1370--1377",

booktitle = "Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC",

publisher = "IEEE",

address = "United States",

note = "29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014 ; Conference date: 16-03-2014 Through 20-03-2014",

url = "https://ieeexplore.ieee.org/xpl/conhome/6784523/proceeding",

}

Zhang, R & Chung, HS-H 2014, Transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current. in Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC., 6803485, IEEE, pp. 1370-1377, 29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014, Fort Worth, Texas, United States, 16/03/14. https://doi.org/10.1109/APEC.2014.6803485

Transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current. / Zhang, Ruihong; Chung, Henry Shu-Hung.
Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC. IEEE, 2014. p. 1370-1377 6803485.

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

TY - GEN

T1 - Transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current

AU - Zhang, Ruihong

AU - Chung, Henry Shu-Hung

PY - 2014

Y1 - 2014

N2 - This paper presents a transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current. The methodology is based on connecting multiple transformers in a daisy chain to balance the string currents. To ensure service continuity of all LEDs, each LED has a bypass thyristor, which is triggered upon open-circuit failure, so that the healthy LEDs in the string would still be operated. A 21W prototype with 7 strings has been built. Each string has three 1W LEDs connected in series. Experimental results show that the LED current can still be regulated at the reference value within ±1% error even if the whole circuit has only one piece of LED in operation and all other LEDs fail short or open. © 2014 IEEE.

AB - This paper presents a transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current. The methodology is based on connecting multiple transformers in a daisy chain to balance the string currents. To ensure service continuity of all LEDs, each LED has a bypass thyristor, which is triggered upon open-circuit failure, so that the healthy LEDs in the string would still be operated. A 21W prototype with 7 strings has been built. Each string has three 1W LEDs connected in series. Experimental results show that the LED current can still be regulated at the reference value within ±1% error even if the whole circuit has only one piece of LED in operation and all other LEDs fail short or open. © 2014 IEEE.

UR - https://www.scopus.com/pages/publications/84900406745

UR - https://www.scopus.com/pages/publications/84900406745#tab=impact

U2 - 10.1109/APEC.2014.6803485

DO - 10.1109/APEC.2014.6803485

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

SN - 9781479923250

SP - 1370

EP - 1377

BT - Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

PB - IEEE

T2 - 29th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2014

Y2 - 16 March 2014 through 20 March 2014

ER -

Transformer-isolated resonant driver for parallel strings with robust balancing and stabilization of individual LED current

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