Bbc Brown, Boveri & Company, Limited

Thomcast Ag

Wolfram Schminke

Hans-Gunter Mathews

In an electron beam device having a cathode (1), in which a high-power electron beam propagating along a beam axis (5) is generated, an anode (3) arranged behind the cathode (1) in the direction of beam axis (5), and a collector (4), arranged behind the anode (3) in the direction of the beam axis (5), for decelerating the electrons of the electron beam, the collector (4) is constructed of several collector stages (6) which are arranged successively in the direction of the beam axis (5) and which successively decrease in potential. A high-voltage direct-current supply (13), which consists of a series of similar switching stages (S1, . . . , S6) which are in each case constructed as switchable medium-voltage sources and the outputs of which are connected in series, is provided for the feed arrangement. The potentials of the collector stages (6) are provided by corresponding taps between the switching stages (S1, . . . , S6) of the high-voltage direct-current supply (13 ).

Electron beam device having a direct current feed with switching stages

A high-voltage direct-current supply system which includes over-current protection and in which the load current supplied by a high-voltage source is measured in a current-measuring device. The high-voltage source includes a plurality of series-connected medium-high voltage sources each of which can be individually turned on and off and each of which includes at least one switching element. The switching elements are switched to interrupt the load current through the respective medium-high voltage source in the event that the load current exceeds a predetermined limit, as detected by a load current limit detector. By providing plural medium-high voltage sources with associated switching devices to derive a composite output voltage from the sum of the outputs of the individual medium-high voltage sources, an economic, flexible and functionally reliable supply unit is produced which has a high efficiency and long service life.

High-voltage direct-current supply with over-current protection

A radio-frequency matching transformer including a wave guide (W) having a fixed length. The waveguide is subdivided into sections (W.sub.1, W.sub.2) which have different characteristic impedances and the lengths of which are interdependently adjustable. A hollow cylinder is provided within the waveguide displaceable therein such that the operating frequency and the transformation ratio can be adjusted within wide ranges without a conversion of the transformer being required. This results in considerable advantages with respect to the known quarter-wave transformer.

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Laufenburg, Germany

Wolfram Schminke