Design Of A Single Phase Unity Power Factor Switch Mode Power Supply (Smps) With Active Power Factor Correction
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Date
2008-09
Authors
Abdullah, Mohamad Nazir
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Abstract
The Switch Mode Power Supplies (SMPS) are a multi-million dollar industry and
continuesly growing industry within the field of power electronics. SMPS is widely been
used in communication, computers and industrial. One of the leading issues in
line-frequency operated power converter design is how to consume power from the grid
but not to return it. The Unity Power Factor (UPF) SMPS has become an important design
issue as a consequence of recent legislation. European legislation restricts the harmonic
content of power supplies. One of them is international standards known as
IEC61 000-3-2. The advantages of UPF are more than legislative compliance. The
advantages include greater efficiency, larger power density and improved power quality
result in economical benefits to the electricity service provider. The goal of this thesis is to
develop a unity power factor rectifier. The motivation in developing this product was to
develop a regulated power supply capable of producing power with low level of harmonic
current distortion. This research involves the design of a 300W Unity Power Factor
Rectifier. The converter operates at an input voltage of 240VAC and regulated output at
350VDC. This allows the converter to operate directly from a residential mains outlet. To
obtain the output at low level voltage, a second-stage DC to DC converter is added. The
prototypes were fully tested at different parameters to test its capabilities. The future work
to be completed on this project includes developing a computer power supply operated at
unity power factor which can be applied for domestic and industrial use. Future designs
could be enhanced by the implementation of a resonant switching stage in the second
stage converter to increase the overall efficiency.
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Keywords
The Unity Power Factor (UPF) SMPS has become , an important design issue as a consequence of recent legislation.