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Variable inductor provides quasi-active power factor correction

PERC has developed a new Sloped Air-gap (SAG) Inductor which has an inductance-current characteristic that is suitable for power factor correction, see

W. Wölfle, W. G. Hurley, " Quasi-Active Power Factor Correction with a Variable Inductive Filter: Theory, Design and Practice", IEEE Transactions on Power Electronics, vol. 18, no. 1, pp. 248-255, January 2003.

The inductance decreases with increasing current due to the saturation of the variable air-gap. This characteristic may be suitable for variable inductance in light dimmers in fluorescent lamps[1] and in the output buck converter for Maximum Power Point Tracking (MPPT) in solar applications [2].

[1] Lee, S.T.S.   Chung, H.S.-H.   Hui, S.Y. “ Use of saturable inductor to improve the dimming characteristics of frequency-controlled dimmable electronic ballasts”, IEEE Transactions on Power Electronics,  vol. 19,  no. 6, pp. 1653-1660, November 2004.
[2] Benavides, N.D.   Chapman, P.L. “ Boost Converter with a Reconfigurable Inductor”, IEEE Power Electronics Specialists Conference, 2007, PESC 2007, pp. 1695-1700, June 2007.

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