RF isolation for power circuitry
First Claim
1. A method for providing isolated power to a component heater of an RF chuck of a plasma processing chamber-that, the RF chuck of the plasma processing chamber 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, andobtainingtransferring said isolated power signal from said secondary winding to said heater of said RF chuck, therebysaid isolation transformer is configured to substantially blockingblock capacitive coupling of said first RF frequency provided to said RF chuck;
anddelivering said isolated power to said component using said isolated power signal;
wherein said isolation transformer transfers said isolated power signal from said primary winding to said secondary winding via mutual inductance, andwherein 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 that is over 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.
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Accused Products
Abstract
System and method for providing isolated power to a component that is also subject a set of RF signals that includes at least a first RF signal having a first RF frequency is provided. There is included providing a DC voltage signal and modulating the DC voltage signal into an isolated power signal using an isolation transformer. The isolated power signal has an intermediate frequency that is higher than 60 Hz and lower than the first RF frequency. There is included supplying the DC voltage signal to the primary winding and obtaining the isolated power signal from the secondary winding; and delivering the isolated power to the component using the isolated power signal.
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Citations
17 Claims
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1. A method for providing isolated power to a component heater of an RF chuck of a plasma processing chamber-that, the RF chuck of the plasma processing chamber 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:
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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 obtainingtransferring said isolated power signal from said secondary winding to said heater of said RF chuck, therebysaid isolation transformer is configured to substantially blockingblock capacitive coupling of said first RF frequency provided to said RF chuck;
anddelivering said isolated power to said component using said isolated power signal; wherein said isolation transformer transfers said isolated power signal from said primary winding to said secondary winding via mutual inductance, and 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 that is over 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for providing isolated power to a component that heater element of a chuck of a plasma processing chamber, the chuck 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:
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first and second terminals for providing a DC voltage signal; and a modulating circuit to modulate 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 a lowest RF frequency among said different RF frequencies, said isolation transformer having a primary winding that is not electrically connected to a secondary winding, wherein said DC voltage signal is supplied to said primary winding and said isolated power signal is obtained from said secondary winding thereby and provided to said heater element, the primary winding is physically spaced apart from secondary winding to facilitate substantially blocking capacitive coupling of said first RF frequency provided to said chuck via the heater element, wherein said isolated power is delivered via mutual inductance through said isolation transformer to said component heater element 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 that is over 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. - View Dependent Claims (13, 14, 15, 16)
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17. A method for providing isolated power to a component load of a chuck of a plasma processing chamber that, the chuck is also subject to a plurality of RF signals, said plurality of RF signals including at least a first RF signal having a first RF frequency, said method comprising:
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providing an AC line signal having a frequency in the range of 50 Hz to 60 Hz; rectifying said AC line signal to obtain a quasi-DC voltage signal; modulating said quasi-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, said first RF frequency representing the a lowest RF frequency among all RF frequencies of said plurality of RF signals, said isolation transformer having a primary winding that is not electrically connected to a secondary winding, including; supplying said quasi-DC voltage signal to said primary winding, and obtainingtransferring said isolated power signal from said secondary winding, therebyto said load of said chuck, said isolation transformer is configured to enable substantially blocking capacitive coupling of said first RF frequency provided to said chuck; wherein said isoaltion transformer transfers said isolated power signal from said primary winding to said secondary winding via mutual inductance; 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 that is over 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; and delivering said isolated power to said component of said plasma processing chamber using said isolated power signal.
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Specification