Patent ID: 6735099
Filing Date: 2004-05-11
Classification: H02M

Abstract:
A power supply unit for bipolar power supply of a plasma technology or surface technology system having at least one controllable d.c. power supply (G1, G2), whose positive and negative outputs are connected to the input of at least one bridge circuit of electronic power switches (T1 to T4), said power switches being connected on the input side to at least one control signal conditioning device and on the output side to at least one current detection circuit for the open-/closed-loop control of the power switches, and being connected to the load of the system (A), whereinfor each bridge circuit (T1 to T4) at least two d.c. power supplies (G1, G2) are provided, the positive output of the two d.c. power supplies is connected in series in each case by two power switches (T1 and T4; T2 and T3) to the negative output of the other power supply (G2, G1), whereby the output of the bridge circuit for the system in each case has a tap between the power switches of the two series circuits.