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Journal of Engineering
Volume 2013 (2013), Article ID 687581, 6 pages
Research Article

Nonlinear Power Inductors for Large Current Crest Factors

STS Spezial-Transformatoren-Stockach GmbH & Co. KG, Am Krottenbühl 1, 78333 Stockach, Germany

Received 11 December 2012; Accepted 13 March 2013

Academic Editor: Jiun-Wei Horng

Copyright © 2013 Alexander Stadler et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


A practical method is presented: how to adjust the inductance curve of a nonlinear (saturable) inductor with respect to a desired shape. For this purpose, a nonlinear model was developed based on finite element method (FEM). It is shown how a highly efficient construction with low stray fields and maximum package density can be achieved. Different prototype inductors were realized to illustrate the practical capability of photovoltaic (PV) inverters as well as active power factor correction (PFC) applications. All simulations are verified by means of experimental data drawn from electrical measurements.