Patent ID: 7593244

Claim:
Wiring arrangement for limiting the harmonics of the current supplied from an AC mains supply to a frequency converter, which frequency converter can be connected to a three-phase AC mains supply, in which frequency converter is an uncontrolled network bridge ( 10 ) for rectifying the AC voltage of the AC electricity supply network, a DC intermediate circuit, in which is a filtering capacitor (C DC ), and a load bridge ( 11 ) provided with power semiconductor switches for forming three-phase AC voltage (U, V, W), and which load bridge can be controlled with pulse-width modulation by means of a control unit, and in which DC intermediate circuit is a choke, in which is a choke part (L 1 , L 2 ) arranged on both the positive and the negative pole, and in which wiring arrangement is an absorption circuit for limiting the harmonics of the current supplied from the AC electricity supply network, characterized in that the absorption circuit is arranged in the DC intermediate voltage circuit, the absorption circuit contains a serial connection of a choke (L 3 ) and a capacitor (C 1 ) connected in parallel with a filter capacitor (C DC ), the choke of the DC intermediate voltage circuit is a two-branch DC choke wound onto a common core, which contains pillars and the yokes between them, and in which an additional pillar for the choke of the absorption circuit is arranged in the magnetic core of the choke.