Publication:
An efficient AC-DC converter with power factor correction
An efficient AC-DC converter with power factor correction
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Date
2015
Authors
Mustafa Emhemed Abdulhafith Abofares
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Publisher
Universiti Malaysia Perlis (UniMAP)
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Abstract
Providing a reliable and stable power source is always considered to be the major contributor which can provide alternative option for eliminating such consequences. Most power conversion applications consist of an AC-DC conversion stage immediately following the AC source. The DC output obtained after rectification is subsequently used for further stages. As such, AC-DC converter has become an integral part of mostly all the electronic equipment. Current use of AC-DC conversion results in providing different power quality which also challenged by the vast varying power and voltage levels. A low power bridgeless AC-DC converter with inherent power factor correction and ultrafast diodes across the switching elements is proposed. A 4-diode bridge rectifier was used along with eliminating the catch diode of a traditional boost converter. This research benefits of the single diode drop of a half wave rectifier while giving a very low output ripple voltage by a full wave rectifier. The evaluation result was configured by setting the switching frequency (Fsw) to 100kHz (Vin_peak = 6V; Vout = 8.5Vdc) with R load equal to 50 n which resulted in high efficiency of 95 .08%. The power factor topology showed best efficiency at Vin levels of higher than 5V peak with lower Vin as well. By comparing it with other previous works, it can be concluded that previous studies achieved efficiency ranging from 70- max 95%, which led to conclude that the proposed circuit is very suitable for low power, low voltage non-isolated applications.
Description
Master of Science in Electrical System Engineering
Keywords
Power conversion,
AC-DC conversion,
Power quality