Patent ID: 8018312

Claim:
An inductor, comprising: a primary coil; at least one secondary coil having at least one loop winding with two open-circuited ports; at least one coupling coil having (i) at least one loop winding with two open-circuited ports and (ii) a switch located between said two open-circuited ports which is arranged to selectively close the loop winding of said at least one coupling coil; and at least one passive coupling structure having said at least one coupling coil arranged between said primary coil and at least one of said secondary coils and/or between two of said secondary coils; wherein (i) said primary coil is coaxially arranged and operated in parallel to said at least one secondary coil and (ii) said at least one coupling coil is radially displaced from said primary and one of said secondary coils so that the whole coupling coil is lying between adjacent loop windings of two of said secondary coils and/or between adjacent loop windings of said primary coil and one of said secondary coils; wherein at least one phase shifting device is arranged between said open-circuited ports of said least one coupling coil; wherein a series connection of said at least one phase shifting device and said at least one active coupling structure is arranged between said open-circuited ports of said at least one secondary coil and/or a coupling coil.