Open AccessLow‐current ripple LED driver by two‐phase driving approach
Author(s) -
Wong Chi Shing,
Lai Yuk Ming,
Loo Ka Hong,
Tse Chi K.
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2015.1479
Subject(s) - ripple , constant current , current (fluid) , capacitor , electrolytic capacitor , power (physics) , light emitting diode , electrical engineering , diode , dual (grammatical number) , led circuit , engineering , computer science , electronic engineering , voltage , short circuit , physics , art , literature , quantum mechanics
A two‐phase driving approach for light‐emitting diode (LED) power supply is proposed. The approach uses two rectangular current sources working complementarily to supply a constant current to the LED string so that the output current can contain very low ripple even without the use of any electrolytic capacitor in the driver circuit. A dual asymmetrical half‐bridge converter with power factor correction is used to realise the approach. A 60 W prototype is built and tested to validate the idea.