THE IMPLEMENTATION OF SINGLE-STAGE PFC SCHEME POWER LIGHT APPLICATION
Thesis for Master of Science
Department of Electrical Engineering
Tatung University
AUTHOR（Jen-Fu Chung）
ABSTRACT
This thesis mainly presents an implementation of a single-stage Power
Factor Correction (PFC) scheme for the low power LED light application.
As mater of fact, the circuit key idea is from the definition of power factor,
that is the input current must follow the voltage all the time. The PF value is
predicted and set properly by the proposed design equations and circuit
architecture. Detail operation principles, algorithms, and experimental results
are offered, and the experimental results based on 24V 700mA LED down
light prototype schematic are also provided. The final PF value reaches as
high as 0.980 which already satisfied the "ENERGY STAR": PF>0.9 for
commercial application. In addition, the current harmonics were passed in
IEC61000-3-2, too.
Index Terms: Boost Converter, Flyback converter, Single stage PFC.
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