Ge Energy Power Conversion Gmbh

Thomas Brückner

Roland Jakob

Thomas Basler

Piotr Sadowski

A method for operating an electrical power rectifier. The power rectifier comprises at least two branches that are connected in parallel to each other, each of the branches comprising at least two power semiconductor elements that are connected in series. The collector-emitter voltage Vce(t) and/or the collector current Ic(t) of one of the power semiconductor elements is detected by means of the method. Furthermore, it is determined whether at least one of the following conditions is met: dVce(t)/dt&#x3c;(dVce/dt), and/or dIc(t)/dt&#x3c;(dIc/dt), and or Ic(t_ent)&#x3c;Ic. If at least one of the aforementioned conditions has been met, the gate-emitter voltage of at least one of the power semiconductor elements is increased.

Method for operating an electrical power rectifier, as well as an electrical power rectifier

An electrical circuit for a power converter is described. The circuit has been provided with several semiconductor switches and capacitors used for operating the power converter. A brake resistance for lowering energy is provided and is connected to the semiconductor switches provided without the need for an additional switch. The operation of the power converter and the current flowing through the brake resistance can be controlled by means of the existing semiconductor switches.

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Munich, Germany

Thomas Brückner