A low flicker TRIAC dimmable direct AC LED driver for always-on LED arrays

Seong Jin Yun; Yong Ki Yun; Yong Sin Kim

doi:10.1109/ACCESS.2020.3034334

A low flicker TRIAC dimmable direct AC LED driver for always-on LED arrays

Seong Jin Yun, Yong Ki Yun, Yong Sin Kim

School of Electrical Engineering

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Direct AC LED drivers have advantages over conventional LED drivers in size and cost because of no need for bulky and expensive inductive components. However, none of conventional direct AC LED drivers researched so far support triode AC switch (TRIAC) compatibility at low percent flicker. This paper achieves both TRIAC dimmer compatibility and low percent flicker by correlating a phase-cut ratio to luminance and using always-on multi-arrays, respectively, without the need of a dedicated IC. The proposed LED driver consists of a phase-cut/DC converter, a switch controller, a current regulator, and three LED arrays. The experimental results based on commercial 15W LEDs show that the percent flicker of 18.6% @ 120 Hz is achieved with an efficiency of 84.7% and a power factor of 97.3% @ 120 V.

Original language	English
Pages (from-to)	198925-198934
Number of pages	10
Journal	IEEE Access
Volume	8
DOIs	https://doi.org/10.1109/ACCESS.2020.3034334
Publication status	Published - 2020

Keywords

Dimmable
Direct AC
Inductor-less
LED
Percent flicker
TRIAC

ASJC Scopus subject areas

Computer Science(all)
Materials Science(all)
Engineering(all)

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10.1109/ACCESS.2020.3034334

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title = "A low flicker TRIAC dimmable direct AC LED driver for always-on LED arrays",

abstract = "Direct AC LED drivers have advantages over conventional LED drivers in size and cost because of no need for bulky and expensive inductive components. However, none of conventional direct AC LED drivers researched so far support triode AC switch (TRIAC) compatibility at low percent flicker. This paper achieves both TRIAC dimmer compatibility and low percent flicker by correlating a phase-cut ratio to luminance and using always-on multi-arrays, respectively, without the need of a dedicated IC. The proposed LED driver consists of a phase-cut/DC converter, a switch controller, a current regulator, and three LED arrays. The experimental results based on commercial 15W LEDs show that the percent flicker of 18.6% @ 120 Hz is achieved with an efficiency of 84.7% and a power factor of 97.3% @ 120 V.",

keywords = "Dimmable, Direct AC, Inductor-less, LED, Percent flicker, TRIAC",

author = "Yun, {Seong Jin} and Yun, {Yong Ki} and Kim, {Yong Sin}",

note = "Funding Information: This work was supported in part by the LG Innotek, and in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF), Ministry of Education, under Grant NRF-2016R1D1A1B04935233. Publisher Copyright: {\textcopyright} 2020 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.",

year = "2020",

doi = "10.1109/ACCESS.2020.3034334",

language = "English",

volume = "8",

pages = "198925--198934",

journal = "IEEE Access",

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T1 - A low flicker TRIAC dimmable direct AC LED driver for always-on LED arrays

AU - Yun, Seong Jin

AU - Yun, Yong Ki

AU - Kim, Yong Sin

N1 - Funding Information: This work was supported in part by the LG Innotek, and in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF), Ministry of Education, under Grant NRF-2016R1D1A1B04935233. Publisher Copyright: © 2020 Institute of Electrical and Electronics Engineers Inc.. All rights reserved.

PY - 2020

Y1 - 2020

N2 - Direct AC LED drivers have advantages over conventional LED drivers in size and cost because of no need for bulky and expensive inductive components. However, none of conventional direct AC LED drivers researched so far support triode AC switch (TRIAC) compatibility at low percent flicker. This paper achieves both TRIAC dimmer compatibility and low percent flicker by correlating a phase-cut ratio to luminance and using always-on multi-arrays, respectively, without the need of a dedicated IC. The proposed LED driver consists of a phase-cut/DC converter, a switch controller, a current regulator, and three LED arrays. The experimental results based on commercial 15W LEDs show that the percent flicker of 18.6% @ 120 Hz is achieved with an efficiency of 84.7% and a power factor of 97.3% @ 120 V.

AB - Direct AC LED drivers have advantages over conventional LED drivers in size and cost because of no need for bulky and expensive inductive components. However, none of conventional direct AC LED drivers researched so far support triode AC switch (TRIAC) compatibility at low percent flicker. This paper achieves both TRIAC dimmer compatibility and low percent flicker by correlating a phase-cut ratio to luminance and using always-on multi-arrays, respectively, without the need of a dedicated IC. The proposed LED driver consists of a phase-cut/DC converter, a switch controller, a current regulator, and three LED arrays. The experimental results based on commercial 15W LEDs show that the percent flicker of 18.6% @ 120 Hz is achieved with an efficiency of 84.7% and a power factor of 97.3% @ 120 V.

KW - Dimmable

KW - Direct AC

KW - Inductor-less

KW - LED

KW - Percent flicker

KW - TRIAC

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U2 - 10.1109/ACCESS.2020.3034334

DO - 10.1109/ACCESS.2020.3034334

M3 - Article

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SN - 2169-3536

VL - 8

SP - 198925

EP - 198934

JO - IEEE Access

JF - IEEE Access

ER -

A low flicker TRIAC dimmable direct AC LED driver for always-on LED arrays

Abstract

Keywords

ASJC Scopus subject areas

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