You may be interested in a paper Power Factor Correction for AC-DC Converters with Cost Effective Inductive Filtering
by W.Wölfle Convertec Ltd., Wexford, IRELAND W.G.Hurley National University of Ireland Galway, IRELAND S.Arnold Enserb Bordeaux, FRANCE To quote the conclusion: This paper presents a new, simple and cost effective solution for the power factor correction of the input current of a switch mode power supply, which meets the IEC limits on harmonic distortion. A sloped air-gap inductor, which adapts its inductance values to the input current conditions of the power supply, is used to shape the current to comply with the limits for harmonic distortions as defined in EN61000-3-2. It is shown that using a classical inductor design, the filter inductor is too bulky, whereas the volume of the sloped air-gap choke is as small as the switching transformer of the power (e.g.100 kHz) supply. In fact, the volume required is not bigger then that required for an active PFC circuit, but at a fraction of the cost. The .pdf is too large to post, but I'll mail a copy to the first ten callers ... Seasonal Greetings ----------------------------- Jon Keeble Fairlight Hardware Engineering Manager 8977 9931 [email protected] _________________________________ The bounds of Time, Space or Mechanics should never stand in the way of a perfectly good idea....... ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. To cancel your subscription, send mail to: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Jim Bacher: [email protected] Michael Garretson: [email protected] For policy questions, send mail to: Richard Nute: [email protected]
