Patent ID: 8421389

Claim:
A circuit arrangement for feeding a magnetically active and electrically operable operating means having a winding, the circuit arrangement, in at least one first phase, comprises: (a) a first branch of a frequency converter adapted for and operable at a first switching frequency of not higher than 5 kHz for outputting a main alternating current generated at said first switching frequency and having a substantially lower operating frequency to the winding of the magnetically active and electrically operable operating means; (b) a second branch of another frequency converter adapted for and operable at a second switching frequency of more than 5 kHz for outputting a supplementary alternating current generated at said second switching frequency to the winding; wherein, in the winding of the operating means, the two alternating currents of the first and second branches are superimposed to form a sum current during parallel operation of the first and second branches of the two non-identical converters for at least the first winding phase of the circuit arrangement.