Method of and apparatus for independently controlling electric parameters of an impedance matching network
First Claim
1. Apparatus for matching a load to a power source, comprising:
- a match network coupled between a power source and a load, the match network having at least two controllable variable electrical characteristics;
a sensor for sensing at least two electric parameters determined by impedances of the load and match network,a drive controller responsive to the sensed parameters of the load for independently controlling a first one of the electrical characteristics of the match network as a function of only one of the parameters of the load and a second one of the electrical characteristics of the match network as a function of only another one of the parameters of the load until the power source and the load are matched.
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Abstract
An arrangement and method for matching a load and a power source, such as an r.f. power source for a vacuum plasma processing chamber, includes a match network coupled between the power source and the load. The match network has at least two controllably variable electrical characteristics. A sensor is provided that senses at least two parameters of the load. A drive controller responds to the sensed parameters of the load to independently control varying a first one of the electrical characteristics of the match network as a function of only one of the parameters of the load, and a second one of the electrical characteristics of the match network as a function of another one of the parameters of the load. This is done until the power source and the load are in a matched condition. The separation of the match variables to establish a nearly one-to-one correspondence with the load parameters allows independent adjustment of the match variables to provide fast and unambiguous reaching of the matched condition.
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Citations
28 Claims
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1. Apparatus for matching a load to a power source, comprising:
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a match network coupled between a power source and a load, the match network having at least two controllable variable electrical characteristics; a sensor for sensing at least two electric parameters determined by impedances of the load and match network, a drive controller responsive to the sensed parameters of the load for independently controlling a first one of the electrical characteristics of the match network as a function of only one of the parameters of the load and a second one of the electrical characteristics of the match network as a function of only another one of the parameters of the load until the power source and the load are matched. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of matching a load to a power source with a match network having a primary circuit and a secondary circuit, comprising the steps of:
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establishing a resonant condition in the primary circuit; measuring at least two parameters of the load; calculating a control variable from at least one of the parameters; determining whether a first one of the load parameters is equal to a first specified value based on the value of the control variable; adjusting a first match variable of the match network to drive the control variable such that the first load parameter is equal to the first specified value; determining whether a second one of the load parameters is equal to a second specified value; and adjusting a second match variable of the match network to drive the match variable such that the second load parameter is equal to the second specified value, wherein the first match variable has a one-to-one correspondence with the first load parameter and the second match variable has a one-to-one correspondence with the second load parameter. - View Dependent Claims (12)
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13. A method of matching a load to a power source with a match network having a primary circuit and a secondary circuit, comprising the steps of:
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measuring at least two parameters of the load; transforming the two parameters of the load into first and second nearly orthogonal functions; and simultaneously and independently adjusting a first match variable of the match network to drive the value of the first orthogonal function to a first specified value, and a second match variable of the match network to drive the value of the second orthogonal function to a second specified value. - View Dependent Claims (14, 15, 16, 17)
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18. A method of impedance matching a load to a source with a matching network having first and second variable electric characteristics, the matching network being connected between the source and load, the method comprising
monitoring first and second electric parameters determined by impedances of the load and matching network, manipulating the first and second electric parameters to derive first and second control functions for the first and second variable electric characteristics, the first control function being only for the first variable electric characteristic, the second control function being only for the second variable electric characteristic, and obtaining an impedance match between the load and source by controlling (a) the first variable characteristic in response to the first control function independently of the second variable characteristic, and (b) the second variable characteristic in response to the second control function independently of the first variable characteristic, the manipulations of the manipulating step enabling the match to be obtained by the controlling step.
Specification