L A. L B. L C. Comparison of a United Chemi-con U767D, 2200 F electrolytic capacitor to a corresponding prototype integrated filter element. Impedance magnitude response of a capacitor.
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Comparison of a United Chemi-con U767D, 2200 F electrolytic capacitor to a corresponding prototype integrated filter element.
Impedance magnitude response of a capacitor
One construction method for an integrated filter element with a center-tapped winding. The cancellation winding is wound on top of the capacitor winding, and is connected to one plate of the capacitor at an appropriate tap point.
Network Analyzer Input
High frequency model of a capacitor
An experimental setup for evaluating filters and components incorporating an Agilent 4395A network analyzer.
The test setup used to measure the conducted EMI performance of integrated filter element.
(a) An end-tapped and (b) a center-tapped connection of coupled magnetic windings.
LISN Power (dBm)
LISN Power (dBm)
LA LB LC
End-tapped LM L22-LM L11-LM
Center-tapped L11+LM L22+LM -LM
An equivalent circuit model for the windings.
Filters and Components with Inductance Cancellation
Timothy C. Neugebauer Joshua W. Phinney Prof. David J. Perreault
Massachusetts Institute of Technology, Laboratory for Electromagnetic and Electronic Systems
Discrete filters using Cornell Dubilier 935C4W10K capacitors with end-tapped cancellation windings printed in the PCB. The board on the left has both capacitors mounted. The board in the middle shows the top (component) side of the board, while the board on the right shows the bottom side of the board.
Performance curves. The higher curve is a capacitor alone (no cancellation). The lower curves are results with six nominally identical circuits incorporating printed cancellation windings. More than a factor of 10 in performance improvement is obtained (20 dB).
LISN power spectra for the case of (a) the capacitor alone and (b) the integrated filter element. The converter was operated at 50% duty cycle at 10 A DC output current.
T. C. Neugebauer, J. W. Phinney, and D. J. Perreault, “Filters and components with inductance cancellation,” 2002 IEEE Industrial Applications Society Annual Meeting, October 2002, pp. 939-947.
T. C. Neugebauer and D. J. Perreault, “Filters with inductance cancellation using Printed Circuit Board Transformers,” 2003 Power Electronics Specialist Conference, June 2003.
Application of coupled magnetic windings to cancel the series inductance of a capacitor. Capacitor ESR and ESL are shown explicitly, along with the equivalent T model of the magnetic
Effects of varying degrees of cancellation below and above optimal. The highest curve in both figures represents the performance of a capacitor without any inductance cancellation. The curves in figure a are the results with center-tapped transformers having mutual inductances between 6 nH and 26 nH at intervals of 4 nH each. Figure b shows the results of having a mutual inductance that is too large; these curves are the results with transformers having mutual inductances between 26 nH and 32 nH with intervals of 2 nH.
United States Office of Naval Research