Patent ID: 8436543

Claim:
A plasma supply device comprising: an inverter connected to a DC power supply, wherein the inverter has at least one switching element, and wherein the inverter is configured to convert DC power from the DC power supply into AC power greater than 500 W at an essentially constant basic frequency greater than 3 MHz; and an output network electrically coupled to the inverter, the output network being electrically coupled to a plasma load, wherein the output network is configured to provide the AC power from the inverter to the plasma load and filter reflected power outside the basic frequency that is returned from the plasma load, the output network comprising first and second inductances electrically coupled between the inverter and a transformer, the output network further comprising a first capacitance electrically coupled to the transformer, and the output network further comprising at least one impedance adapter element configured to electrically couple the transformer to the plasma load, the impedance adapter being configured to match an output network impedance to a load impedance of the plasma load; and wherein at least one inductance in the output network includes a magnetic field strengthening element that is a Perminvar ferrite.