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|Title:||Use of single stage power factor circuits for compact fluorescent lamps|
|Authors:||Choi, Yee Hang|
|Department:||Department of Electronic Engineering|
|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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