Cancellation of inductor winding capacitance

Details Cancellation of inductor winding capacitance Cancellation of inductor winding capacitance

2006-10-24

2009-06-30

Takaoka, Dean O (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C336S229000

Reexamination Certificate

active

07554423

ABSTRACT:
An inductor device or filter such as an electromagnetic interference (EMI) filter which includes an inductor provides cancellation of parasitic capacitance of the inductor and extends high frequency performance of the inductor or filter by providing the inductor using split windings and including capacitors to couple signals corresponding to those which are passed by the equivalent parallel capacitance of the inductor to another split winding or an inductor in the ground return path. Cancellation of parasitic capacitance is provided for differential mode and common mode split windings where the split windings may be either inductively coupled or not. Forming the split windings as a bifilar winding to increase coupling coefficient further improves performance and allows cancellation (as distinct from parasitic capacitance reduction) and avoidance of resonance in circuits in which an inductor is not permitted in the ground return path.

REFERENCES:
patent: 3731234 (1973-05-01), Collins
patent: 3748581 (1973-07-01), Yello
patent: 6507176 (2003-01-01), Wittenbreder, Jr.
Wang et al., Design of Inductor Winding Capacitance Cancellation for Suppression, Power Electronics Specialists Conference , 2006. PESC'06.37, Jun. 22, 2006, 7 pages.

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