Please use this identifier to cite or link to this item: http://dspace.cityu.edu.hk/handle/2031/3686
Title: Use of single stage power factor circuits for compact fluorescent lamps
Authors: Choi, Yee Hang
Department: Department of Electronic Engineering
Issue Date: 2006
Supervisor: Supervisor: Prof. Ron Hui. Assessor: Prof. Henry Chung
Abstract: This implementation of single stage power factor circuits for compact fluorescent lamps is provided by cost-effective passive electronic components. Instead of the conventional one which consists of a full bridge rectifier followed by a very large capacitor of hundreds of micro-farad or even a few milli-farad, there exist a basic valley-filled (VF) power factor correction circuit which provides valley voltage about peak of the line voltage. The VF flattens the mains pulsating current to give a quasi-sine wave that greatly increases the power factor correction up to 90% or even higher. If this VF is improved and combined with a valley charge pump circuit, which provide valley current of the input, the PF would be even higher, good enough to meet international standard such as IEC1000-3-2 Class C lighting requirements.
Appears in Collections:Electronic Engineering - Undergraduate Final Year Projects

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