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Modeling of an LTCC Inductor Capable of Improving Converter Light-Load Efficiency

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3 Author(s)
Michele H. Lim ; Center for Power Electronics Systems, The Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061 USA ; J. D. van Wyk ; K. D. T. Ngo

A low-profile power inductor fabricated using low temperature co-fired ceramics (LTCC) technology has been demonstrated to improve the light-load efficiency of a 5 V-to-1 V, 12.5 A buck converter operating with a switching frequency of 4 MHz, without the use of additional control circuitry. Variation in inductor geometry is performed experimentally to study the effects on the light-load efficiency of a converter. By decreasing the conductor width of the inductor, the light-load efficiency can be further improved by more than 30 % over that of commercial inductors having similar inductance. An empirical model is developed based on in-circuit large signal measurements to describe the relationship among inductance, average current, and inductor geometry to help in the future design of such planar inductors.

Published in:

APEC 07 - Twenty-Second Annual IEEE Applied Power Electronics Conference and Exposition

Date of Conference:

Feb. 25 2007-March 1 2007