Polyphase line filter

Details Polyphase line filter Polyphase line filter

2007-04-30

2008-11-18

Pascal, Robert J. (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S177000, C333S185000

Reexamination Certificate

active

07453331

ABSTRACT:
A polyphase line filter includes a first filter branch between a first filter input and a first filter output, the first filter branch comprising a series connection of at least two inductances wound onto different legs of a multi-leg filter core, and a second filter branch between a second filter input and a second filter output, the second filter branch comprising a series connection of at least two inductances wound onto the different legs of the multi-leg filter core. An inventive polyphase line filter has a smaller setup volume, a smaller power dissipation and is less expensive than conventional polyphase line filters. In connection with electronical appliances having internal B2or B6rectifier circuits and subsequent smoothing by capacitors, the inventive polyphase line filter provides for a smoothed direct current downstream of the rectifier and for a strongly reduced ripple current in the smoothing capacitors of a consumer.

REFERENCES:
patent: 6075425 (2000-06-01), Gopfrich et al.
patent: 6339265 (2002-01-01), Levin et al.
patent: 2006/0197385 (2006-09-01), Levin et al.
patent: 3826524 (1989-03-01), None
patent: 19829424 (1999-01-01), None

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