Patent ID: 7843086

Claim:
A choke for power grid filters, having a primary winding ( 1 a, b, c ) for connecting the choke to a primary circuit ( 2 ) and a secondary winding ( 1 d ) with a secondary circuit ( 4 ), in which the primary winding ( 1 a, b, c ) and secondary winding ( 1 d ) are located on a winding core ( 3 ) and the secondary circuit ( 4 ) includes a damping member ( 5 a, b, c ), which effect the damping in the primary circuit ( 2 ) by means of the choke, wherein the damping member ( 5 a, b, c ) includes means which accomplish the damping in proportion to a primary circuit parameter, and the primary circuit parameter is in particular the primary circuit voltage or the primary circuit current or the primary circuit frequency.