Patent ID: 9633885
Date: 2017-04-25
CPC Classifications: H01L,H02N

Claim:
1. An electrostatic clamping system, comprising: an electrostatic clamp having a clamping surface associated therewith, wherein the electrostatic clamp comprises a first pair of electrodes and a second pair of electrodes, wherein each of the first pair of electrodes are associated with a respective one-third of the clamping surface, and wherein each of the second pair of electrodes are associated with a respective one-sixth of the clamping surface; a power supply configured to selectively output a DC clamping voltage and a three-phase AC clamping voltage; and a controller configured to selectively operate the electrostatic clamp in a DC mode and an AC mode, wherein the DC mode electrically connects one of the first pair of electrodes and one of the second pair of electrodes to a positive terminal of the power supply and the other one of the first pair of electrodes and other one of the second pair of electrodes to a negative terminal of the power supply, and wherein the AC mode electrically connects a first phase terminal of the power supply to one of the first pair of electrodes, a second phase terminal of the power supply to the other one of the first pair of electrodes, and a third phase terminal of the power supply to both of the second pair of electrodes.