Patent ID: 8755204

Claim:
A method for providing isolated power to a component of a plasma processing chamber-that is also subject to a set of RF signals, said set of RF signals including at least a first RF signal having a first RF frequency, comprising: providing a DC voltage signal; modulating said DC voltage signal into an isolated power signal using an isolation transformer, said isolated power signal having an intermediate frequency that is higher than 60 Hz and lower than said first RF frequency, wherein said set of RF signals includes a plurality of RF signals having different RF frequencies, said first RF frequency representing the lowest RF frequency among said different RF frequencies, said isolation transformer having a primary winding that is not electrically connected to a secondary winding, including: supplying said DC voltage signal to said primary winding, and obtaining said isolated power signal from said secondary winding, thereby substantially blocking said first RF frequency; and delivering said isolated power to said component using said isolated power signal; wherein said secondary winding is wound with a larger diameter around a core of said isolation transformer resulting in an air gap between said secondary winding and said core for reducing the capacitive coupling between said secondary winding and said core than a diameter with which said primary winding is wound around said core.