Inductor devices – Coils of special configuration – Toroidal
Reexamination Certificate
2011-03-08
2011-03-08
Nguyen, Tuyen (Department: 2832)
Inductor devices
Coils of special configuration
Toroidal
Reexamination Certificate
active
07902956
ABSTRACT:
A polyphase filtering choke arrangement of a power electronics appliance, more particularly of a frequency converter. which arrangement comprises two separate magnetic cores, around both of which a polyphase winding is arranged, particularly for filtering the harmonics of a network current and the common-mode noise currents, wherein both the magnetic cores (1, 2, 101a-101c,102a-102c,130a-130d,140a-140d) are shaped to form a closed magnetic circuit, the magnetic cores (1and2, 101a-101cand102a-102c,130a-130dand140a-140d) are arranged one on top of the other, the magnetic cores are connected to each other with connecting pieces (11-13, 11a-13b,111-113, 121-124), and the winding directions of the windings of the magnetic cores are opposing with respect to each other, in which case the fluxes produced in the magnetic cores of each current are of opposing directions, in which case the flux produced by the difference-mode current circulates via the connecting pieces from one magnetic core to another.
REFERENCES:
patent: 6909352 (2005-06-01), Hobson et al.
patent: 2005/0030140 (2005-02-01), Dahlgren et al.
patent: 2006/0186981 (2006-08-01), Jang et al.
patent: 1 487 092 (2004-12-01), None
patent: 7-22886 (1995-01-01), None
patent: 07022886 (1995-01-01), None
patent: 8-138947 (1996-05-01), None
Birch & Stewart Kolasch & Birch, LLP
Nguyen Tuyen
Vacon Oyj
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