RF Power Delivery With Integrated Impedance Matching for Dynamic Loads
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Solution Overview
Problem
Existing RF power delivery systems for dynamic loads face challenges such as high costs due to separate RF generator and impedance matching network modules, independent control loops that cannot compensate for cross-coupling between power and impedance control, slow dynamic response, and ineffective impedance measurement-based control algorithms, leading to poor performance in stabilizing plasma loads.
Innovation Solution
A system with a power supply providing constant DC power, a power amplifier, sensors for voltage, current, and phase measurements, an electrically controllable impedance matching system, and a controller for simultaneous conductance and susceptance control, along with a sensor calibration module and power dissipation module to enhance power regulation and impedance matching, allowing for high-speed multi-input-multi-output control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate RF generator and impedance matching network modules are used, then system modularity and independent control are achieved, but system cost increases and control loops cannot compensate for cross-coupling between power and impedance control
Solution Approach 1:
The patent combines the RF generator and impedance matching network into a single integrated module, eliminating the need for separate control loops and reducing system cost. The integration allows simultaneous control of power and impedance through a unified control architecture, resolving the cross-coupling issue that plagues separate module designs.
Solution Approach 2:
The integrated RF generator-impedance matching network performs multiple functions (power generation, impedance matching, and simultaneous control) within a single system, eliminating the need for separate specialized modules and their associated control loops, thereby reducing overall system complexity while maintaining adaptability.
2Adaptability or versatility
If vacuum variable capacitors driven by motors are used for impedance matching, then adjustable impedance control is achieved, but response time becomes hundreds of milliseconds which is too slow for plasma transients
Solution Approach 1:
The patent replaces mechanical motor-driven vacuum variable capacitors with solid-state electronic impedance matching components. This substitution eliminates mechanical inertia and switching delays, achieving response times in the microsecond range that are sufficient for tracking plasma transients while maintaining full impedance adjustment capability.
Solution Approach 2:
The invention changes the operational parameters of the impedance matching system by using solid-state electronic switching instead of mechanical adjustment, thereby transforming the response time from hundreds of milliseconds to microseconds while preserving the ability to adjust impedance across the required range.
3Ease of operation
If independent power control loop and impedance control loop are used, then separate control functions are achieved, but cross-coupling between power and impedance control cannot be compensated leading to poor closed-loop performance
Solution Approach 1:
The patent merges the power control and impedance control functions into a single integrated control loop that simultaneously manages both parameters. This unified approach allows the controller to compensate for cross-coupling effects between power and impedance, improving closed-loop performance while maintaining the functional independence needed for separate control of each parameter.
Solution Approach 2:
The integrated control system incorporates feedback mechanisms that monitor both power and impedance parameters simultaneously, allowing the controller to detect and compensate for cross-coupling effects in real-time, thereby improving overall system reliability and closed-loop performance compared to independent control loops.
4Reliability
If DC power supply with large electrolytic capacitor filter is used, then power filtering is achieved, but dynamic response becomes slow regardless of control update rate
Solution Approach 1:
The patent changes the filtering approach by using high-speed electronic filtering methods instead of traditional large electrolytic capacitors. This allows the system to maintain effective power filtering while achieving fast dynamic response, as the electronic filters can respond rapidly to changes without the inherent slow response of large capacitor-based filtering.
Data Source
AI summary
A system and method are provided for delivering power to a dynamic load. The system includes a power supply providing DC power having a substantially constant power open loop response, a power amplifier for converting the DC power to RF power, a sensor for measuring voltage, current and phase angle between voltage and current vectors associated with the RF power, an electrically controllable impedance matching system to modify the impedance of the power amplifier to at least a substantially matched impedance of a dynamic load, and a controller for controlling the electrically controllable impedance matching system. The system further includes a sensor calibration measuring module for determining power delivered by the power amplifier, an electronic matching system calibration module for determining power delivered to a dynamic load, and a power dissipation module for calculating power dissipated in the electrically controllable impedance matching system.