Koninklijke Philips Corporation N.v.

U.S. Phillips Corporation

Wolfgang Rexhausen

Bernhard Wagner

Christoph Loef

Heinz Willi Van Der Broeck

Marc Maria Alex Bleukx

Klaus F Hoffmann

Bernd Freiheit-Jensen

Cornelius Paul

Christian Willy Vollertsen

Frank Mueller

Marc Klingelhoeller

Norbert Geerkens

The present invention refers to high-voltage generators, in particular to a step-down DC-to-DC converter circuit (buck converter) for supplying a DC output voltage Uwhich may e.g. be used in a voltage supplying circuitry of an X-ray radio-graphic imaging system. According to the invention, the peak value of the buck converter's storage inductor current Iis controlled by a control circuit &#x3bc;C' which regulates the on-time &#x394;tof a semiconductor switch S in the feeding line of this storage inductor L. As a result thereof, an output current sensor CS, which is commonly used in today's buck converter designs, becomes redundant.

Output current sensing method in discontinuous DC-to-DC voltage converter

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

The invention relates to a power supply unit which includes an inverter having output connections whereto the primary winding of a transformer is connected via a series capacitor. The rectified secondary voltage of this transformer is applied to a use which requires a high short-time power in a first mode of operation and a lower continuous power in a second mode of operation. The maximum permissible continuous power can be increased by means of an auxiliary inductance Lh which is active in the second mode of operation but inactive in the first mode of operation.

Power supply unit including a pulse width modulated inverter, notably

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Thomasburg, Germany

Wolfgang Rexhausen