Patent ID: 7902956
Filing Date: 2011-03-08
Classification: H01F,H02M,H03H

Abstract:
1. A poly-phase filtering choke arrangement of a power electronics appliance, comprising: first and second magnetic cores, arranged one above of the other, each of the cores having a shape which forms a closed magnetic circuit, and each being provided with multiple poly-phase windings capable of filtering harmonics of a network current and common-mode noise currents; and multiple connecting pieces formed separately from the cores, the connecting pieces being disposed between the first and second magnetic cores so that the first and second magnetic cores are spaced apart yet are connected to each other with the connecting pieces, wherein the poly-phase windings of the first and second magnetic cores have winding directions which are opposed with respect to each other, so that with a common-mode current, fluxes produced in the first and second magnetic cores have opposed directions, and so that with a difference-mode current, the fluxes circulate via the connecting pieces from the first magnetic core to the second magnetic core, and wherein the poly-phase windings and the connecting pieces are arranged in alternating positions around the first and second magnetic cores, the positions being offset from each other, so that when the poly-phase filtering choke is view in plan viewed, the poly-phase windings and the connecting pieces do not overlap each other.