Institute of Electrical and Electronics Engineers (IEEE)

An optocouplerless two-stage high power factor LED driver

Xianming Xie ¹

Meipan Ye ²

Yongjun Cai ³

Jianxing Wu ³

Hide authors affiliations Show authors affiliations: 3 affiliations

College of Automation, Hangzhou Dianzi University, Hangzhou, China, 310018 |

College of Information Engineering, Hangzhou Dianzi University, Hangzhou, China, 310018 |

Hangzhou Silan, Microelectronics. Ltd., Hangzhou, China, 310012 |

Publication type: Proceedings Article

Publication date: 2011-03-01

Institute of Electrical and Electronics Engineers (IEEE)

DOI: 10.1109/apec.2011.5744883

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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.

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