Circuit theoretic considerations of LED driving: voltage-source versus current-source driving
File(s)
Accepted version
Author(s)
Dong, Z
Tse, CK
Hui, R
Type
Journal Article
Abstract
IEEE Light-emitting-diodes (LEDs) are solid-state devices with specific v-i characteristics. In this paper we study the basic requirement of the driving circuits and discuss the proper approach to driving LEDs in view of their characteristics. We compare voltage source driving and current source driving, and discuss their relative advantages and constraints. We specifically introduce the use of circuit duality principle for developing new current-source-mode (CSM) drivers which are less known but are theoretically more versatile compared to their conventional voltage-source-mode counterparts. The study highlights the effects of the choice of driving circuits in terms of the number and size of circuit components used, duty cycle variation, sensitivity of control, nonlinearity and control complexity} of LED drivers. We propose a CSM single-inductor multiple-output (SIMO) converter which demonstrates the advantage of having inductorless and easily controlled current-source drivers, and present a comparison of the CSM SIMO converter with the existing SIMO converters. We further illustrate that a high-voltage-step-down ratio can be naturally achieved by the CSM high-voltage-step-down converter without the use of transformers. This paper presents a systematic and comparative exposition of the circuit theory of driving LEDs, with experimental evidence supporting the major conclusions.
Date Issued
2019-03-29
Date Acceptance
2018-07-23
Citation
IEEE Transactions on Power Electronics, 2019, 34 (5), pp.4689-4702
ISSN
0885-8993
Publisher
IEEE
Start Page
4689
End Page
4702
Journal / Book Title
IEEE Transactions on Power Electronics
Volume
34
Issue
5
Copyright Statement
© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Identifier
https://ieeexplore.ieee.org/document/8424050
Subjects
Electrical & Electronic Engineering
0906 Electrical and Electronic Engineering
Publication Status
Published
Date Publish Online
2018-07-31