Siemens Aktiengesellschaft

Koninklijke Philips Corporation N.v.

Jens Weber

Albrecht Gensior

Martin Bischoff

Oliver Hennig

Oliver Woywode

Ingmar Schule

Steffen Bernet

Karl-Heinz Kufer

Kai Plociennik

Hans Baernklau

Tobias Barth

An X-ray source arrangement () for generating X-ray radiation (), a method for operating the X-ray source arrangement (), and an X-ray imaging apparatus () are provided. The X-ray source arrangement () comprises an X-ray tube (), a converter arrangement () with an inverter () and a resonant converter () for providing a source voltage to the X-ray tube (), a pre-controller (), and a modulator (). The pre-controller () is configured for determining a reference duty ratio (r,) of the resonant converter () as a continuous function of time based on a mathematical model of the resonant converter (), and for providing a control signal () correlating with the reference duty ratio (r,) to the modulator (). The modulator () is configured for determining a switching signal () based on the control signal (), and for providing the switching signal () to the inverter () of the converter arrangement () for actuating the inverter ().

X-ray source arrangement for generating X-ray radiation

In a method for generating with a modular multilevel power converter (M2C) having a plurality of sub-modules a frequency-variable output voltage, the sub-modules are switched on and off to generate from an input voltage discrete voltage steps approximating an approximately sinusoidal alternating output voltage having a first angular frequency located between a zero frequency and a second angular frequency, and the input voltage is controlled or regulated as a function of the first angular frequency so as to be located between a lower angular frequency, which is equal to or greater than the zero frequency, and a third angular frequency, such that the input voltage increases with increasing first angular frequency, thereby reducing capacitor complexity in the power converter.

Method for producing an output voltage and assembly for performing the method

A method for creating a physical layout of a photovoltaic system in a specified field is provided where the photovoltaic system is specified by a plurality of technical properties. The method includes reading out more than 20 pre-calculated, completed layouts for the photovoltaic system from a memory; presenting the completed layouts in a graphical presentation wherein each of the completed layouts is represented by at least one partial amount of the plurality of technical properties; modifying value ranges of the presented technical properties, in order to present a modified number of completed layouts in a comparable manner; and selecting an optimized layout that has been optimized with regard to the presented properties from the modified number of completed layouts. Thereby a photovoltaic system having a high nominal power can be established in the best possible manner. The physical layout of the entire photovoltaic system is adapted to the specified field.

Method for designing a physical layout of a photovoltaic system

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Dresden, Germany

Jens Weber