Inductor devices – Three or more windings
Reexamination Certificate
2007-04-24
2007-04-24
Nguyen, Tuyen T. (Department: 2832)
Inductor devices
Three or more windings
C363S047000
Reexamination Certificate
active
11376145
ABSTRACT:
The present invention provides a filter circuit realizing reduction in the number of magnetic cores on a circuit board and a space occupied by the magnetic cores, and a power supply unit using the filter circuit. A filter circuit includes a first filter part and a second filter part which are connected in series. The first filter part includes a center leg coil and a capacitor, and the second filter part includes an outer leg coil and a capacitor. The center leg coil is wound around a center leg of a magnetic core including the center leg, a first outer leg part configuring a loop magnetic path in common with the center leg, and a second outer leg part configuring another loop magnetic path in common with the center leg. The first and second outer leg parts share the center leg. The outer leg coil is wound around the outer leg parts in a manner such that magnetic fluxes generated in the outer leg parts by current flowing in the outer leg coil cancel each other in the center leg.
REFERENCES:
patent: 3229184 (1966-01-01), Churchill
patent: 3340458 (1967-09-01), Keller
patent: 4422056 (1983-12-01), Roberts
patent: 4876638 (1989-10-01), Silva et al.
patent: 4888675 (1989-12-01), Kumar et al.
patent: 5335163 (1994-08-01), Seiersen
patent: A 11-122911 (1999-04-01), None
Nguyen Tuyen T.
Oliff & Berridg,e PLC
TDK Corporation
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