RF impedance model based fault detection
First Claim
1. A method for controlling a plasma system based on an event, comprising:
- accessing a computer-generated model of one or more parts of the plasma system, the one or more parts include a plurality of circuit components that are connected with each other via a plurality of connections, wherein the one or more parts include a radio frequency (RF) cable that is coupled to an input of an impedance matching circuit and to an output of an RF generator, the plasma system including a plasma chamber, the RF generator, the RF cable, the impedance matching circuit, and a transmission line between the plasma chamber and the impedance matching circuit, wherein the computer-generated model has a plurality of elements that are connected logically with each other via a plurality of connections, wherein the plurality of connections between the elements are generated based on the connections between the plurality of circuit components, wherein the computer-generated model includes a model of the RF cable, wherein at least one of the one or more elements are located within the model of the RF cable;
receiving data regarding a supply of RF power to the plasma chamber, wherein the data is received from a sensor within the RF generator, the RF power supplied via the impedance matching circuit and the transmission line to the plasma chamber using a configuration that includes one or more states, the one or more states repeat continuously during the supply of RF power to the plasma chamber;
propagating the data via the computer-generated model to produce model data at an output of the computer-generated model during the supply of RF power to the plasma chamber, the model data being associated with one of the one or more states;
examining the model data during the one of the one or more states, the examining being of one or more variables that characterize performance of a plasma process of the plasma system;
identifying a potential fault for the one or more variables during the one of the one or more states;
determining that the potential fault has occurred for a pre-determined period of time during the one of the one or more states, such that the potential fault is identified as an event;
classifying the event to generate a classification; and
controlling the one or more parts of the plasma system based on the classification of the event.
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Accused Products
Abstract
A method to detect a potential fault in a plasma system is described. The method includes accessing a model of one or more parts of the plasma system. The method further includes receiving data regarding a supply of RF power to a plasma chamber. The RF power is supplied using a configuration that includes one or more states. The method also includes using the data to produce model data at an output of the model. The method includes examining the model data. The examination is of one or more variables that characterize performance of a plasma process of the plasma system. The method includes identifying the fault for the one or more variables. The method further includes determining that the fault has occurred for a pre-determined period of time such that the fault is identified as an event. The method includes classifying the event.
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Citations
31 Claims
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1. A method for controlling a plasma system based on an event, comprising:
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accessing a computer-generated model of one or more parts of the plasma system, the one or more parts include a plurality of circuit components that are connected with each other via a plurality of connections, wherein the one or more parts include a radio frequency (RF) cable that is coupled to an input of an impedance matching circuit and to an output of an RF generator, the plasma system including a plasma chamber, the RF generator, the RF cable, the impedance matching circuit, and a transmission line between the plasma chamber and the impedance matching circuit, wherein the computer-generated model has a plurality of elements that are connected logically with each other via a plurality of connections, wherein the plurality of connections between the elements are generated based on the connections between the plurality of circuit components, wherein the computer-generated model includes a model of the RF cable, wherein at least one of the one or more elements are located within the model of the RF cable; receiving data regarding a supply of RF power to the plasma chamber, wherein the data is received from a sensor within the RF generator, the RF power supplied via the impedance matching circuit and the transmission line to the plasma chamber using a configuration that includes one or more states, the one or more states repeat continuously during the supply of RF power to the plasma chamber; propagating the data via the computer-generated model to produce model data at an output of the computer-generated model during the supply of RF power to the plasma chamber, the model data being associated with one of the one or more states; examining the model data during the one of the one or more states, the examining being of one or more variables that characterize performance of a plasma process of the plasma system; identifying a potential fault for the one or more variables during the one of the one or more states; determining that the potential fault has occurred for a pre-determined period of time during the one of the one or more states, such that the potential fault is identified as an event; classifying the event to generate a classification; and controlling the one or more parts of the plasma system based on the classification of the event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 29)
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22. A method for controlling a plasma system based on an event, comprising:
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receiving data for one of a plurality of states of radio frequency (RF) power of an RF signal supplied by an RF generator, wherein the data is received from a sensor within the RF generator, wherein the plurality of states of the RF power alternate between a first power level of the RF power and a second power level of the RF power over time, wherein the first power level represents an envelope of the RF signal and is different from an envelope represented by the second power level; propagating the data through a computer-generated model of one or more parts of a plasma system to generate model data for the one of the plurality of states, wherein the model data is generated at an output of the computer-generated model, the one or more parts include a plurality of circuit components that are connected with each other via a plurality of connections, wherein the one or more parts include an RF cable that is coupled to an input of an impedance matching circuit and to an output of the RF generator, the plasma system including the RF generator, the impedance matching circuit, and a plasma chamber coupled to the impedance matching circuit via an RF transmission line, wherein the computer-generated model has a plurality of elements that are connected logically with each other via a plurality of connections, wherein the plurality of connections between the plurality of elements are generated based on the plurality of connections between the plurality of circuit components, wherein the computer-generated model includes a model of the RF cable, wherein at least one of the plurality of elements are located within the model of the RF cable; generating values for the one of the plurality of states from the model data, wherein the values are associated with one or more variables; determining for the one of the plurality of states whether the values associated with the one or more variables meet corresponding one or more thresholds for the one of the plurality of states; generating a fault for the one of the plurality of states upon determining that one or more of the values of the one or more variables fail to meet the one or more thresholds; determining whether the fault occurs for a pre-determined period of time; generating an event for the one of the plurality of states upon determining that the fault occurs for the pre-determined period of time; classifying the event to generate a classification for the one of the plurality of states; and controlling the one or more parts of the plasma system based on the classification of the event. - View Dependent Claims (23, 24, 25)
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26. A plasma system for identifying an event based on a potential fault in the plasma system, comprising:
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a radio frequency (RF) generator for generating and supplying an RF signal at an output of the RF generator, the RF signal being supplied having RF power that includes a plurality of states, wherein the plurality of states repeat continuously during the supply of the RF signal, wherein the plurality of states of the RF power alternate between a first power level of the RF power and a second power level of the RF power over time, wherein the first power level represents an envelope of the RF signal and is different from an envelope represented by the second power level; an impedance matching circuit connected to the RF generator for receiving the RF signal from the RF generator to generate a modified RF signal; an RF transmission line coupled to the impedance matching circuit for transferring the modified RF signal; a plasma chamber connected to the RF transmission line for receiving the modified RF signal via the RF transmission line to generate plasma; a sensor coupled to the output of the RF generator and located within the RF generator; and a host system coupled to the sensor, the host system including a processor for; accessing a computer-generated model of one or more parts of a plasma system, the one or more parts including a plurality of circuit components that are connected with each other via a plurality of connections, wherein the one or more parts includes an RF cable that is coupled to an input of the impedance matching circuit and to the output of the RF generator, wherein the computer-generated model has a plurality of elements that are connected logically with each other via a plurality of connections, wherein the plurality of connections between the plurality of elements are generated based on the plurality of connections between the plurality of circuit components, wherein the computer-generated model includes a model of the RF cable, wherein at least one of the plurality of elements are located within the model of the RF cable; receiving data from the sensor regarding the supply of the RF signal, wherein the data is received from the sensor within the RF generator, wherein the data is received for one of the plurality of states of the RF power; propagating the data via the computer-generated model to produce model data for the one of the plurality of states, wherein the model data is produced at an output of the computer-generated model during the supply of the RF signal; examining the model data for the one of the plurality of states, the examining being of one or more variables that characterize performance of a plasma process within the plasma chamber; identifying a potential fault for the one of the plurality of states based on the one or more variables; determining that the potential fault has occurred for a pre-determined period of time, such that the potential fault is identified as an event for the one of the plurality of states; and classifying the event to generate a classification for the one of the plurality of states; and controlling the one or more parts of the plasma system based on the classification of the event. - View Dependent Claims (27, 28)
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30. A controller for controlling a plasma system based on an event, comprising:
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a processor configured to; access a computer-generated model of one or more parts of the plasma system, wherein the one or more parts include a radio frequency (RF) cable that is coupled to an input of an impedance matching circuit and to an output of an RF generator, the plasma system including a plasma chamber, the RF generator, the RF cable, the impedance matching circuit, and a transmission line between the plasma chamber and the impedance matching circuit, wherein the computer-generated model has a plurality of elements that are connected with each other via a plurality of connections, wherein the computer-generated model includes a model of the RF cable, wherein at least one of the plurality of elements are located within the model of the RF cable; receive data regarding RF power of an RF signal supplied by the RF generator to the impedance matching circuit, wherein the data is received from a sensor within the RF generator, wherein the RF power has a plurality of states that alternate between a first power level of the RF power and a second power level of the RF power over time, wherein the first power level represents an envelope of the RF signal and is different from an envelope represented by the second power level; propagate the data via the computer-generated model to produce model data at an output of the computer-generated model, wherein the model data is produced for the one of the plurality of states, the model data being of one or more variables; examine the model data to identify a potential fault, wherein the potential fault is identified for the one of the plurality of states; and control the one or more parts of the plasma system based on the potential fault; and a memory device coupled to the processor, wherein the memory device is configured to store the computer-generated model. - View Dependent Claims (31)
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Specification