NDLI: Coupled-Magnetic Filters with Adaptive Inductance Cancellation

Content Provider	IEEE Xplore Digital Library
Author	Lymar, D.S. Neugebauer, T.C. Perreault, D.J.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA (Lymar, D.S.)
Abstract	Conventional filter circuits suffer from a number of limitations, including performance degradation due to capacitor parasitic inductance and the size and cost of magnetic elements. Coupled-magnetic filters have been developed that provide increased filter order with a single magnetic component, but also suffer from parasitic inductance in the filter shunt path due to imperfectly-controlled coupling of the magnetics. In this paper, we introduce a new approach to coupled-magnetic filters that overcomes these limitations. Filter sensitivity to variations in coupling is overcome by adaptively tuning the coupling of the magnetic circuit with feedback based on the sensed filter output ripple. This active coupling control enables much greater robustness to manufacturing and environmental variations than are possible in the conventional coupled-magnetic approach, while preserving its advantages. Moreover, the proposed technique also adaptively cancels the deleterious effects of capacitor parasitic inductance, thereby providing much higher filter performance than is achievable in conventional designs. The new technique is experimentally demonstrated in a dc/dc power converter application and is shown to provide high performance
Starting Page	590
Ending Page	600
File Size	1714953
Page Count	11
File Format	PDF
ISBN	0780390334
DOI	10.1109/PESC.2005.1581686
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-06-16
Publisher Place	Brazil
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive filters Inductance Magnetic separation Coupling circuits Magnetic circuits Capacitors Degradation Costs Circuit optimization Output feedback
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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