DocumentCode
1845314
Title
A dimmable light-emitting diode (LED) driver with cascaded mag-amp postregulators for multistring applications
Author
Chen, W. ; Hui, S.Y.R.
Author_Institution
Centre for Power Electron., City Univ. of Hong Kong, Hong Kong, China
fYear
2010
fDate
7-10 Nov. 2010
Firstpage
2523
Lastpage
2528
Abstract
A dimmable LED driver with cascaded magnetic amplifiers is proposed for multistring applications. A master power converter is used to provide the major part of the voltage for a plurality of slave converter modules with magnetic amplifier control. The magnetic amplifiers are used to regulate only the varying part of the LED string voltage and therefore greatly reduce the power losses in parallel converter modules. Good current balance among the parallel LED strings and a high energy efficiency in the range of 86-88% has been achieved for a 21W practical prototype formed with 3 parallel strings.
Keywords
light emitting diodes; magnetic amplifiers; cascaded magnetic amplifiers; light-emitting diode; master power converter; slave converter modules; Converters; Driver circuits; Light emitting diodes; Regulators; Resistors; Voltage control; Windings;
fLanguage
English
Publisher
ieee
Conference_Titel
IECON 2010 - 36th Annual Conference on IEEE Industrial Electronics Society
Conference_Location
Glendale, AZ
ISSN
1553-572X
Print_ISBN
978-1-4244-5225-5
Electronic_ISBN
1553-572X
Type
conf
DOI
10.1109/IECON.2010.5675160
Filename
5675160
Link To Document