Patent ID: 7455755

Claim:
Vacuum plasma generator with a generator output ( 9 , 9 ′) for feeding a plasma discharge ( 10 ) for the treatment of workpieces ( 5 ) in a vacuum chamber ( 2 ) with an AC voltage mains connection ( 6 a ), a mains rectifier configuration ( 6 ) for the conversion of the mains AC voltage into a DC voltage, a smoothing capacitor ( 6 b ), a first stage as a clocked DC/DC voltage converter ( 7 ) with means for setting the DC output voltage which forms an intermediate circuit voltage (Uz), comprising a controlled power switch ( 7 a ) which feeds the primary winding of a transformer ( 14 ) and whose secondary winding is connected to a rectifier ( 15 ) and a downstream intermediate circuit capacitor ( 12 ) and forms a floating transformer secondary circuit ( 23 ), wherein this circuit is connected with a downstream second stage which forms a pulse output stage ( 8 ) and this output stage is connected to the generator output ( 9 , 9 ′), characterized in that the DC-DC voltage converter ( 7 ) comprises at least two floating transformer secondary circuits ( 23 ) and includes a change-over device ( 20 ) with a switch control ( 22 ) for the optional parallel or serial connection of the floating transformer secondary circuits ( 23 ).