Siemens Aktiengesellschaft

Michael Kopf

Marcel Lutze

Mirjam Mantel

Stefan Völkel

Markus Reinhard

Henrik Krupp

Stefan Steinmüller

Various embodiments of the teachings herein include a power converter. The power converter may include: a converter for converting between a first electrical voltage and a second electrical voltage; a common mode filter having a common mode transformer; and a second winding connected to a frequency-selective passive damping circuit arranged on a common core. The common mode transformer has at least two first windings arranged in the same direction on the common core and coupled in series into electrical conductors connected to the converter device.

Power converter with common mode filter

A modular high-frequency converter includes submodules, each having an input-side half bridge and a DC link circuit with a DC link capacitance connected in parallel to the half bridge. A DC link circuit voltage drop across the DC link capacitance of each submodule is controlled to a target voltage by adjusting a duty cycle with a closed-loop control structure having a pilot control and a downstream closed-loop error control. Within the framework of the pilot control, a target value for each duty cycle and a target value for the supply current are determined, using a mathematical model of the converter, based on the load-side output currents flowing out of the DC link voltage circuits and on target values of the DC link circuit voltages. Switch position parameters, which map the effect of the switch positions of the input-side half bridges, are each replaced by an associated duty cycle.

Modular high-frequency converter and method for operating the same

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Feucht, Germany

Michael Kopf