Driving switches of a plasma load power supply
First Claim
1. A method of operating a power supply delivering a high frequency output signal having a power of more than 500 W and a substantially constant fundamental frequency greater than 3 MHz to a plasma load, the method comprising:
- determining an operating parameter, an environmental parameter of a switching element or a switching bridge parameter;
generating individual drive signals for at least two switching elements of a switching bridge of the power supply as a function of the determined operating parameter, environmental parameter, or switching bridge parameter; and
individually driving the switching elements of the power supply with respective ones of the generated drive signals in normal operation of the power supply;
wherein individually driving the switching elements includes driving the switching elements in a non-complimentary manner.
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Accused Products
Abstract
Operation of a plasma supply device having at least one switching bridge with at least two switching elements, and configured to deliver a high frequency output signal having a power of >500 W and a substantially constant fundamental frequency >3 MHz to a plasma load is accomplished by determining at least one operating parameter, at least one environmental parameter of at least one switching element and/or a switching bridge parameter, determining individual drive signals for the switching elements taking into account the at least one operating parameter, the at least one environmental parameter and/or the switching bridge parameter, and individually driving the switching elements with a respective drive signal.
84 Citations
17 Claims
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1. A method of operating a power supply delivering a high frequency output signal having a power of more than 500 W and a substantially constant fundamental frequency greater than 3 MHz to a plasma load, the method comprising:
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determining an operating parameter, an environmental parameter of a switching element or a switching bridge parameter; generating individual drive signals for at least two switching elements of a switching bridge of the power supply as a function of the determined operating parameter, environmental parameter, or switching bridge parameter; and individually driving the switching elements of the power supply with respective ones of the generated drive signals in normal operation of the power supply; wherein individually driving the switching elements includes driving the switching elements in a non-complimentary manner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A power supply configured to generate an output power greater than 500 W at a substantially constant fundamental frequency greater than 3 MHz, and to deliver a high-frequency output signal to a plasma load, by which, at least upon mismatching, reflected power is returned to the power supply, the power supply comprising:
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a drive signal generator, which drives at least two drivers; a switching bridge having at least two switching elements, each of the drivers associated with only a respective one of the switching elements; and at least one sensor connected to the drive signal generator and responsive to an operating parameter, a switching element environmental parameter, a switching bridge parameter, or a combination thereof; wherein the power supply is configured such that, when the power supply is operated in normal operation while at least indirectly connected to a plasma load, the drive signal generator generates individual drive signals for the switching elements as a function of input from the sensor, and such that non-complimentary operation of the switching elements is enabled. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification