Novel Current Line Sensor Based On Matched Optocouplers For Active Power Factor Correction
Journal Title: Acta Technica Napocensis- Electronica-Telecomunicatii (Electronics and Telecommunications) - Year 2013, Vol 54, Issue 3
Abstract
This paper presents a novel line current sensor which allows safe and accurate data acquisition for power factor measurements: it uses a pair of matched optocouplers arranged so that the difference between their outputs is proportional with the line current; thus the second order harmonics caused by the inherent non-linearity of the optocouplers are cancelled. A system for analyzing experimentally the effects the power factor (PF) has over the efficiency of quasi-resonant flyback switch mode power supplies (SMPS) was build based on this sensor. It provides the chronograms of the line voltage and current, along with the most important data related to the power factor and the efficiency of the power conversion. Experimental results shows that active power factor correction improve the efficiency of the SMPS by up to 6%.
Authors and Affiliations
Paul MARTARI, Dorin PETREUS, Marius NEAG
Keywords
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