Method and apparatus for preventing instabilities in radio-frequency plasma processing
First Claim
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1. An RF plasma generator, comprising:
- a power source;
a partial resonant inverter receiving a power form the power source, the partial resonant inverter providing a constant output power controlled by varying at least one of input voltage or switching frequency, wherein the partial resonant inverter includes a first circuit for converting the voltage from the power source to a desired voltage and a second circuit for maintaining the desired voltage at a constant power level; and
a RF generator receiving the constant power from the partial resonant inverter.
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Abstract
A method and apparatus for controlling a power supply to prevent instabilities due to dynamic loads in RF plasma processing systems, operating at frequencies of from 1 MHz and up 1 MHz and above. The apparatus includes a power source, a power converter receiving power from the source, the power converter providing a constant output power controlled by varying at least one of input voltage or switching frequency, and an RF generator receiving constant power from the power converter.
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Citations
11 Claims
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1. An RF plasma generator, comprising:
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a power source; a partial resonant inverter receiving a power form the power source, the partial resonant inverter providing a constant output power controlled by varying at least one of input voltage or switching frequency, wherein the partial resonant inverter includes a first circuit for converting the voltage from the power source to a desired voltage and a second circuit for maintaining the desired voltage at a constant power level; and a RF generator receiving the constant power from the partial resonant inverter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for delivering constant power to a plasma load, comprising:
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receiving power from a power supply; converting the power received from the power supply to a desired power level, that is controlled by varying at least one of input voltage or switching frequency, with a partial resonant inverter, wherein converting includes converting the voltage from the power source to a desired voltage through a first circuit and maintaining the desired voltage at a constant power level through a second circuit; and delivering the constant power to an RF generator to energize the plasma load. - View Dependent Claims (8, 9, 10)
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11. A system for delivering constant power to a plasma load, comprising:
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means for receiving power from a power supply; means for converting the power received from the power supply to a desired power level that is controlled by varying at least one of input voltage or switching frequency, wherein, the means for converting the power includes a first circuit for converting the voltage from the power source to a desired voltage and a second circuit for maintaining the desired voltage at a constant power level; and a RF generator for receiving the constant power from the means for converting the power and for delivering the constant power to energize the plasma load.
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Specification