Single-Stage LED Driver Achieves Electrolytic Capacitor-Less and Flicker-Free Operation With Unidirectional Current Compensator

AC-connected light emitting diode (LED) drivers experience imbalanced energy between input and output in a half-line cycle. To achieve the flicker-free operation, the imbalanced energy needs to be buffered, often by energy-dense electrolytic capacitors. However, electrolytic capacitors are also well...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on power electronics 2019-07, Vol.34 (7), p.6760-6776
Main Authors: Fang, Peng, Webb, Samuel, Liu, Yan-Fei, Sen, Paresh C.
Format: Article
Language:English
Subjects:
AC-connected light emitting diode (LED) driver
Alternating current
Buck converters
Buffers
Capacitors
Circuits
Electric potential
electrolytic capacitor-less
Electrolytic capacitors
Energy
energy buffering
Energy conversion
Filtering
Flicker
flicker-free operation
high power factor
High voltages
Life span
Light emitting diodes
Lighting
Pins
Power conversion
Topology
Voltage fluctuations
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:AC-connected light emitting diode (LED) drivers experience imbalanced energy between input and output in a half-line cycle. To achieve the flicker-free operation, the imbalanced energy needs to be buffered, often by energy-dense electrolytic capacitors. However, electrolytic capacitors are also well-known for their short lifespan. These capacitors are the limiting factor of an LED drivers' lifespan. High voltage film capacitors and a buck converter have been used in the proposed LED driver to buffer the imbalanced energy. When P in > P LED , the extra energy is transferred from the ac input directly to the high voltage film capacitors. When P in < P LED , the energy is transferred from the high voltage film capacitors to the output by the buck converter. The imbalanced energy goes through two power conversion steps in the proposed LED driver, which is one time less than other comparable electrolytic capacitor-less designs, enabling a higher efficiency to be achieved. A 28 W flyback topology based experimental prototype had been built and tested to verify the proposed design.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2018.2874999