Power converter unit (1,1') capable to convert an electrical input power into a bipolar output power and to deliver this output power to at least two independent plasma processing chambers (9a, 9b.. 9n), the unit (1,1') comprising: - one power input port for connection to an electrical power delivering grid, - at least two, preferably more than two, power output ports (3a, 3b,.. 3n) each for connection to one of the plasma process chambers (9a, 9b,... 9n), - a control device configured to control the unit (1,1') to deliver the bipolar output power to the power output ports (3a, 3b,.. 3n), using control parameters of at least one of: power, voltage, current, excitation frequency, or threshold for protective measures by obtaining a full set of desired values for the parameters for the output ports (3a, 3b,.. 3n), - a first power converter stage configured to convert the input power to an intermediate power, preferable to DC link power and preferably the unit (1,1') comprises at least one further power converter stage (6, 6a, 6b,.. 6n) configured to convert the intermediate power from the first power converter stage to the bipolar output power, - switching means (8a, 8b,... 8n) between the power converter stage(s) (5, 6, 6a, 6b,...6n) and the output ports (3a, 3b,.. 3n), characterized in that - the control device is further configured to calculate whether the power converter unit (1,1') is capable of delivering every desired parameter to every of the output ports (3a, 3b,.. 3n), and if this is the case, to calculate a sequence of pulses of power delivery to the output ports (3a, 3b,.. 3n) in order to supply the power to the plasma processes, and the control device is configured to control the power converter stages (5, 6, 6a, 6b,...6n) and/or the switching means (8a, 8b,... 8n) such that, in use, the unit (1,1') delivers at a first time a first output power signal at the first output power port for a first time frame (T31-T32) and at a second time a second power signal at a second output power port (3b,.. 3n) for a second time frame (T41-T42), where the first time is different from the second time and/or the first time frame (T31-T32) is different from the second time frame (T41-T42). - one power input port for connection to an electrical power delivering grid, - at least two, preferably more than two, power output ports (3a, 3b,.. 3n) each for connection to one of the plasma process chambers (9a, 9b,... 9n), - a control device configured to control the unit (1,1') to deliver the bipolar output power to the power output ports (3a, 3b,.. 3n), using control parameters of at least one of: power, voltage, current, excitation frequency, or threshold for protective measures by obtaining a full set of desired values for the parameters for the output ports (3a, 3b,.. 3n), - a first power converter stage configured to convert the input power to an intermediate power, preferable to DC link power and preferably the unit (1,1') comprises at least one further power converter stage (6, 6a, 6b,.. 6n) configured to convert the intermediate power from the first power converter stage to the bipolar output power, - switching means (8a, 8b,... 8n) between the power converter stage(s) (5, 6, 6a, 6b,...6n) and the output ports (3a, 3b,.. 3n), characterized in that - the control device is further configured to calculate whether the power converter unit (1,1') is capable of delivering every desired parameter to every of the output ports (3a, 3b,.. 3n), and if this is the case, to calculate a sequence of pulses of power delivery to the output ports (3a, 3b,.. 3n) in order to supply the power to the plasma processes, and the control device is configured to control the power converter stages (5, 6, 6a, 6b,...6n) and/or the switching means (8a, 8b,... 8n) such that, in use, the unit (1,1') delivers at a first time a first output power signal at the first output power port for a first time frame (T31-T32) and at a second time a second power signal at a second output power port (3b,.. 3n) for a second time frame (T41-T42), where the first time is different from the second time and/or the first time frame (T31-T32) is different from the second time frame (T41-T42).