Title :
Low-current ripple LED driver by two-phase driving approach
Author :
Chi Shing Wong ; Yuk Ming Lai ; Ka Hong Loo ; Tse, Chi K.
Author_Institution :
Dept. of Electron. & Inf. Eng., Hong Kong Polytech. Univ., Hunghom, China
Abstract :
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.
Keywords :
AC-DC power convertors; bridge circuits; light emitting diodes; power factor correction; half bridge converter; light emitting diode power supply; low current ripple LED driver; power 60 W; power factor correction; two phase LED driver;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2015.1479
