Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Koninklijke Philips Corporation N.V.

Klaus F Hoffmann

Zhe Yu

Holger Kapels

Christoph Loef

Bernhard Wagner

Wolfgang Rexhausen

Bernd Freiheit-Jensen

Cornelius Paul

Christian Willy Vollertsen

Frank Mueller

Marc Klingelhoeller

An apparatus for controlling a switching DC-DC converter with a first half-bridge circuit including a first switch and a second switch, with a second half-bridge circuit including a third switch and a fourth switch and with an inductance connected between the center taps of the first and the second half-bridge circuit includes, according to embodiments, a control unit that is configured to adapt, in dependence on an input voltage and an output voltage at the switching DC-DC converter, a switching frequency of the switches of the DC-DC converter, the duty cycles of the first and fourth switch and the time delay between switching on the first and the fourth switch. The control unit is configured to determine the switching frequency, the first duty cycle, the second duty cycle and the time delay based on an output current of the switching DC-DC converter.

Apparatus for controlling a switching DC-DC converter, switching DC-DC converter and method for controlling a switched DC-DC converter

Embodiments of the present invention provide a DC-DC converter having a first DC voltage gate, a second DC voltage gate and a storage choke. The storage choke is coupled between the first DC voltage gate and the second DC voltage gate by means of electric switching elements. The DC-DC converter is configured such that a direction of a current flow through the storage choke is inverted at least once during a switching period of the electric switching elements. Further, the DC-DC converter is configured to track or readjust a switching frequency of the electric switching elements in case of a change of operating parameters of the DC-DC converter such that a change of direction of the current flow through the storage choke during a switching period of the electric switching elements is ensured.

DC-DC converter with inductor current direction reversed each switching period

A power supply power supply () comprising a DC voltage supply, a control unit and a plurality of high voltage channels (-) is suggested. Each high voltage channel () includes an inverter (IKTV), a resonance circuit, a transformer (TR), and a rectifier (RECT). The resonance circuit cooperates with the inverter (INV). The inverter (INV) is formed by a first switching unit and a second switching unit whereby a voltage of a first polarity can be applied to the resonance circuit in a first switching state, whereas a voltage of a second polarity can be applied to the resonance circuit in a second switching state. The switching states can be switched by the control unit in such a manner that in a first mode of an operation for high output power, the output power can be adjusted by changing the switching frequency in the range of the resonance frequency. In a second mode of operation for low output power, the output power can be adjusted by changing the duration of the switching state at an essentially constant switching frequency.

Method modular power supply for x-ray tubes and method thereof

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Hamburg, Germany

Klaus F Hoffmann