Koninklijke Philips Corporation N.v.

Christoph Leof

Rainer Pietig

Marc Maria Alex Bleukx

A method and device for operating a device for high-voltage switching for driving capacitive loads, having a first and a second input terminal () for applying a high voltage supply, such that a higher potential of the high-voltage supply may be applied to the first input terminal () and a lower potential may be applied to the second input terminal (); a first and a second switch (S, S), connected in series between the first and the second input terminal (); a first and a second clamping diode (D, D), connected in series and in the same blocking direction between the first input terminal and the second input terminal, such that the first second clamping diode block with respect to the applied high voltage; a storage inductor Ls, which is connected with one of its terminals to a connecting point () of the both switches and with another terminal to a connecting point () of the both clamping diodes; and an output terminal () for connecting a capacitive load Cl, which output terminal is connected with the connecting point () of the both clamping diodes (D, D). The method comprises starting with both switches (S, S) open; closing of the first switch (S) after a first predetermined time; opening (ST) of the first switch (S) after a second predetermined time; closing (ST) of the second switch (S), after arriving a zero voltage over the second switch.

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Aachen, Germany

Christoph Leof