Patent ID: 11888311
Assignee: ADVANCED ENERGY INDUSTRIES, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 8:
9. A pulsed DC power supply system configured to provide pulsed DC to electrodes in a plasma processing chamber, the pulsed DC power supply system comprising:
a DC power supply configured to provide a process voltage, V1, to a first and a second rail;
a first switching circuit coupled to the first and second rails, and configured to convert the process voltage, V1, and any other voltage on the first and second rails, to a pulsed output for provision to the electrodes in the plasma processing chamber;
a voltage-boosting circuit coupled between the first and second rails and comprising:
a capacitive element;
two inductive elements; and
three switches, wherein
the two inductive elements and the capacitive element are connected at a first node, and wherein
the voltage-boosting circuit is configured to draw current from the DC power supply when an impedance of the plasma processing chamber increases thereby raising a voltage between the first and second rail by a boost voltage, V2, where the boost voltage, V2, is selectable by a duty cycle of two of the three switches.