Dynamic Generator Setpoint Control for Nonlinear Plasma Loads
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Solution Overview
Problem
Existing plasma power and control systems face instability and chaos due to non-linear loads, leading to unpredictable responses such as overshoot and clamping, which are not effectively managed by traditional integral control mechanisms.
Innovation Solution
A dynamic control system that includes a power amplifier and metrology component to measure instantaneous power, a dynamic setpoint module to calculate error values, and a controller to adjust the internal setpoint based on these measurements, ensuring precise and consistent power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional integral control mechanism is used, then the control system is simple to implement, but the system becomes unstable and chaotic due to non-linear plasma loads
Solution Approach 1:
The patent implements a feedback mechanism where the measured average power is continuously compared against the target average power, and the internal setpoint is dynamically adjusted based on the error signal. This closed-loop feedback control eliminates the instability and chaos caused by traditional integral control with non-linear plasma loads, while maintaining system reliability.
Solution Approach 2:
The patent transforms the static integral control mechanism into a dynamic control system where the internal setpoint is continuously updated based on real-time power measurements and error calculations. This dynamic adjustment allows the system to adapt to changing plasma conditions without becoming chaotic, resolving the contradiction between simplicity and stability.
2Stability of the object's composition
If integral control mechanism with memory is used, then the control system maintains continuity, but unexpected overshoot and instability occur due to plasma non-linearity
Solution Approach 1:
The patent calculates the target internal setpoint in advance based on the difference between measured and target average power. This preliminary calculation of the required setpoint adjustment allows the system to prepare the correct control action before applying it, preventing unexpected overshoot while maintaining control continuity through the sequential execution of measure-calculate-apply cycles.
3Manufacturing precision
If dynamic setpoint adjustment is implemented, then power control precision is improved, but system complexity increases
Solution Approach 1:
The system performs self-adjustment by automatically measuring its own output power, calculating the error against the target, and modifying its internal setpoint accordingly. This self-service capability achieves high power delivery precision without requiring external complex control mechanisms, as the system uses its own measurements and calculations to optimize its performance.
Data Source
AI summary
A generator and a method for controlling the generator are disclosed. The method comprises receiving a power sequence comprising a plurality of power states, creating a dynamic reference-time response within each state, and determining a dynamic average-delivered-power value within each state. An error signal is calculated within each state, and a controller output is produced using the error signal. An internal setpoint is produced based upon the error signal, and a power amplifier is controlled using the internal setpoint to control output power.