Title :
An optocouplerless two-stage high power factor LED driver
Author :
Xie, Xiaogao ; Ye, Meipan ; Cai, Yongjun ; Wu, Jianxing
Author_Institution :
Coll. of Autom., Hangzhou Dianzi Univ., Hangzhou, China
Abstract :
An optocouplerless two-stage high power factor LED driver is proposed in this paper. The first stage is an optocouplerless isolated PFC converter and the second stage is a constant-current controlled non-isolated DC/DC LED driver. Optocoupler and secondary amplifier circuit of the first PFC stage can be removed. Besides, the output capacitor s of the PFC stage can be reduced due to low output ripple voltage requirement and acceptable wide input voltage range of the secondary stage in the two-stage LED driver. Hence the circuit structure of the proposed optocouplerless two-stage high power factor LED Driver is much simplified. A prototype LED driver for 12W LED fluorescent tube is built up to verify theoretical analysis and experiment results are presented.
Keywords :
LED lamps; fluorescent lamps; power factor; LED fluorescent tube; constant-current controlled non-isolated DC-DC LED driver; optocoupler; optocouplerless two-stage high power factor LED driver; power 12 W; secondary amplifier circuit; Capacitors; Driver circuits; Electron tubes; Light emitting diodes; Reactive power; Switches; Topology;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2011 Twenty-Sixth Annual IEEE
Conference_Location :
Fort Worth, TX
Print_ISBN :
978-1-4244-8084-5
DOI :
10.1109/APEC.2011.5744883
