Patent ID: 8736204
Filing Date: 2014-05-27
Classification: H02M,H02P

Abstract:
1. An apparatus for transferring power between an electricity network operating on alternating-current electricity and a multiphase electric machine the apparatus comprising: low-voltage power cells operating on a cascade principle, the power cells comprising a single-phase output connection, and at least one transformer comprising, for each of the power cells, a single-phase or multiphase winding dedicated to the each power cell, the at least one transformer comprising at least one additional winding connected to a same magnetic circuit as the single-phase or multiphase winding for the purpose of at least one auxiliary circuit, which is connected to the at least one additional winding, wherein the auxiliary circuit is a power supply unit comprising one or more controllable power switches, wherein the power supply unit is configured to form, via the one or more controllable power switches, a rising voltage with a pulse-width modulation (PWM) principle to charge one of filter capacitors of the power cells, a brake circuit among one or more brake circuits, and both the filter capacitors of the power cells and the brake circuit, and wherein the brake circuit is configured to operate such that when a supply network drops, the power cells supply braking power via the at least one additional winding to the one or more brake circuits.