RF Power Delivery With Fast 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 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, which hinder efficient power regulation and stability in plasma applications.
Innovation Solution
A system with a power supply providing constant open-loop 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 calculation, enabling high-speed multi-input-multi-output control and robust plasma stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate RF generator and impedance matching network modules are used, then system reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines the RF generator and impedance matching network into a single integrated module, eliminating the need for separate RF voltage/current sensors and magnitude/phase detectors in the matching network. This integration reduces device complexity and cost while maintaining system reliability through unified control architecture.
2Ease of operation
If independent power control loop and impedance control loop are used, then ease of operation is improved, but control precision deteriorates due to inability to compensate for cross-coupling
Solution Approach 1:
The patent implements a unified control architecture where the power control loop and impedance control loop share common feedback signals (RF voltage and current measurements). This allows the control system to compensate for cross-coupling between power and impedance control, improving control precision while maintaining ease of operation through automated control algorithms.
3Adaptability or versatility
If vacuum variable capacitor driven by motors is used, then adaptability is improved, but speed deteriorates due to response time of hundreds of milliseconds
Solution Approach 1:
The patent replaces motor-driven mechanical vacuum variable capacitors with solid-state electronically controlled impedance matching components. This substitution eliminates mechanical inertia and motor response delays, achieving impedance matching response times in the microsecond range while maintaining full adaptability for plasma load variations.
4Stability of the object's composition
If large electrolytic capacitor is used in DC power supply, then stability is improved, but speed deteriorates due to slow dynamic response
Solution Approach 1:
The patent implements a dynamic DC power supply architecture that can rapidly adjust power delivery in response to plasma load changes. The system uses fast-responding power electronic components and control algorithms to achieve microsecond-scale dynamic response while maintaining stable operation through feedback regulation, eliminating the need for large electrolytic capacitors that slow down the response.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enhances power setpoint regulation, impedance matching, and load disturbance mitigation, providing robustness to transients and allowing independent power regulation regardless of power loss variations, with a high power step-up ratio and fast response to plasma changes.
Implementation Method 1
a power amplifier for converting the DC power to RF power
Implementation Method 2
an electrically controllable impedance matching system to modify the impedance of the power amplifier to at least substantially match an impedance of a dynamic load
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.