Patent ID: 9210788
Filing Date: 2015-12-08
Classification: C23C,H01J,H03H,H05H

Abstract:
1. A power supply apparatus comprising: a first discharge circuit which alternately charges a predetermined potential at a predetermined frequency to a first electrode and a second electrode which are in contact with a plasma in a chamber; and a second discharge circuit which charges a predetermined potential to the chamber being grounded and one of the first and second electrodes that is not receiving an output from the first discharge circuit, wherein the first discharge circuit has: a DC power supply source; and a bridge circuit which is constituted by switching elements connected to a positive DC output and a negative DC output from the DC power supply source, the first discharge circuit being adapted to control the operation of each of the switching elements in the bridge circuit to output to the first and second electrodes, wherein the second discharge circuit has another DC power supply source, an end of the positive DC output from said another DC power supply source is grounded, and an end of the negative DC output is connected to the first and second electrodes through other switching elements which are interlocked with the operation of the switching elements in the bridge circuit, and wherein the other switching elements are controlled so as to connect the end of the negative DC output of said another DC power supply source to one of the first and second electrodes having electric potential lower than the other of the first and second electrodes when the predetermined potential is charged to the first discharge circuit.