Patent ID: 11875972
Assignee: PRODRIVE TECHNOLOGIES INNOVATION SERVICES B.V.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  C | IPC H

Claim 10:
11. A voltage waveform generator for a plasma processing apparatus, the voltage waveform generator comprising a power stage and a controller, wherein the power stage comprises:
an output node,
a first DC power supply coupled to the output node through a first switch (SW1), wherein the first DC power supply is configured to output a voltage of a first magnitude (V1),
a second DC power supply coupled to the output node and configured to provide a current (I2) of second magnitude, and
a ground terminal coupled to the output node through a second switch (SW2, SW5),
wherein the power stage further comprises:
a third DC power supply coupled to the output node through a third switch (SW3), wherein the third DC power supply is configured to output a voltage of a third magnitude (V3), and
a fourth DC power supply coupled to the output node through a fourth switch (SW4), wherein the fourth DC power supply is configured to output a voltage of a fourth magnitude (V4),
wherein the first, third and fourth DC power supplies are coupled in parallel to the output node,
wherein the first magnitude (V1) is larger than the third magnitude (V3) and the fourth magnitude (V4),
wherein the controller is configured to control actuation of the first (SW1), second (SW2, SW5), third (SW3) and fourth (SW4) switches to obtain a predetermined voltage waveform at the output node.