Patent ID: 9129776
Filing Date: 2015-09-08
Classification: H01J,H05H

Abstract:
1. A pulsed DC power supply system providing pulsed DC power to a plurality of anodeless electrodes sustaining a plasma in a plasma processing chamber, the pulsed DC power supply system comprising: a first DC power supply supplying a first DC power to a first and a second rail having a first rail voltage therebetween; a first switching circuit receiving the first DC power via the first and second rails and converting the first DC power to a first pulsed DC voltage configured for delivery to at least a first anodeless electrode of the plasma processing chamber; a first voltage-boosting circuit coupled between the first and second rails, the first voltage-boosting circuit including a first voltage multiplier and a first voltage multiplier modifier, the first voltage multiplier configured to draw current from the first DC power supply when an impedance of a plasma load increases thereby raising the first rail voltage by a first boost voltage V a second DC power supply supplying a second DC power to a third and fourth rail having a second rail voltage therebetween; a second switching circuit receiving the second DC power via the third and fourth rails and converting the second DC power to a second pulsed DC voltage configured for delivery to at least a second anodeless electrode of the plasma processing chamber; and a second voltage-boosting circuit coupled between the first and second rails, the second voltage-boosting circuit including a second voltage multiplier and a second voltage multiplier modifier, the second voltage multiplier configured to draw current from the second DC power supply when the impedance of the plasma load increases thereby raising the second rail voltage by a second boost voltage V