Coupled-magnetic filters with adaptive inductance cancellation
Name
62278579-MIT.pdf
Description
Full printable version
Size
4.99 MB
Format
Adobe PDF
Checksum (MD5)
1a76e3eb5154fb3de9d0c6dacf081b3e
Author(s)
Lymar, Daria S
Advisor(s)
David J. Perreault.
Date Issued
2005
Publisher
Massachusetts Institute of Technology
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. This document proposes 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 is 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.
Description
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2005.
Includes bibliographical references (p. 95-96).
Subjects
Electrical Engineering and Computer Science.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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