Real-Time Power Compensation for Plasma Deposition Arcing
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Solution Overview
Problem
In plasma deposition processes, the actual energy delivered to the plasma chamber varies due to arcing, resulting in a 5%-10% reduction compared to the desired energy, making it difficult to preprogram compensation for these losses.
Innovation Solution
A power supply system with a detector, compare module, and adjust module that samples actual power output, compares it to the set power, and generates a compensation value to update the power setting in real-time, ensuring consistent energy delivery by adjusting the power stage output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power setting is used to control delivered energy in plasma deposition, then the deposition process can be controlled, but actual energy delivered varies and does not match desired energy due to arcing
Solution Approach 1:
The system continuously monitors actual power delivered to the plasma chamber and feeds this information back to the controller. The controller compares actual power with desired power and dynamically adjusts the power setting to compensate for deviations caused by arcing, ensuring accurate energy delivery throughout the deposition process.
Solution Approach 2:
The system proactively compensates for power losses by continuously adjusting the power setting before significant energy deficits accumulate. By detecting power variations in real-time and making preemptive adjustments to the power delivery, the system prevents deposition inconsistencies rather than correcting them after the fact.
2Manufacturing precision
If power losses are not compensated, then the system is simpler to operate, but deposition consistency deteriorates due to 5%-10% energy reduction
Solution Approach 1:
The feedback mechanism automatically monitors and corrects power delivery variations, eliminating the need for manual intervention or complex preprogramming. The system self-regulates by continuously comparing actual versus desired power levels and making real-time adjustments, achieving high deposition precision without excessive operational complexity.
Solution Approach 2:
The power control system performs self-correction by automatically detecting power losses and adjusting its own output without external intervention. The controller monitors its own performance and autonomously compensates for arcing-induced variations, maintaining deposition consistency while keeping the system relatively simple to operate.
3Productivity
If preprogrammed compensation is used, then energy delivery can be adjusted, but it is not effective because arc recovery intervals are only microseconds and arcs occur several thousand times per second
Solution Approach 1:
The system employs continuous periodic monitoring of power delivery at intervals suitable for detecting microsecond-scale arc events. By sampling power levels repeatedly and rapidly throughout the deposition process, the system captures the statistical average effect of frequent arcs and makes timely corrections to maintain consistent energy delivery.
Solution Approach 2:
Real-time feedback allows the system to respond to power variations as they occur during the deposition process, rather than relying on preprogrammed compensation based on historical data. The continuous monitoring and adjustment cycle ensures that even though individual arcs occur too quickly to detect individually, their cumulative effect on energy delivery is continuously corrected.
Data Source
AI summary
An apparatus and method for controlling an application of power to power a plasma chamber. A detector detects actual power out from the power stage to the plasma chamber during a sampling interval. A compare module compares the actual power out during the sampling interval to a present power setting during the sampling interval and generates a compensation value. An adjust module updates the present power setting for the power stage with the compensation value to provide a new power setting for the power stage to control the power out from power stage to the plasma chamber during the deposition process whereby power losses occurring during the deposition process are compensated during the deposition process. If there is a fixed time period for the deposition process, the compensation method and apparatus may be used to compensate the deposition process for energy losses without extending the duration of the deposition process.