RF Source Tuning With Pulsed DC Bias for Impedance Matching
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Solution Overview
Problem
Existing RF generator systems face challenges in precisely controlling impedance between the power source and load, especially when dealing with time-varying signals and pulsed DC outputs, which can lead to inefficiencies and increased stress on the generator.
Innovation Solution
A RF generator system that includes a power source outputting a time-varying signal and a controller generating an impedance control signal in response to a pulsed DC output signal. The impedance control signal varies in accordance with the half cycles of the pulsed DC signal, allowing for precise control of impedance during both negative and positive half cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional RF generator systems are used without pulsed DC bias control, then the system structure is simpler, but impedance matching precision deteriorates and reflected power increases
Solution Approach 1:
The patent segments the control function by introducing a dedicated controller that generates impedance control signals based on pulsed DC bias, separating the impedance control task from the general RF power generation function. This allows precise impedance matching through specialized control while maintaining modular system architecture.
Solution Approach 2:
The controller generates impedance control signals in advance based on the pulsed DC bias signal characteristics, preparing the impedance matching conditions before the RF power is delivered to the load. This preliminary impedance preparation reduces reflected power and improves power transfer efficiency.
2Productivity
If impedance control is not implemented, then the device complexity is lower, but power delivery efficiency deteriorates and thermal stress increases
Solution Approach 1:
The system implements feedback control by monitoring the pulsed DC bias signal and adjusting the impedance control signals accordingly. This closed-loop approach ensures optimal impedance matching during different phases of the pulsed cycle, maximizing power delivery efficiency while protecting against thermal stress.
Solution Approach 2:
The impedance control system dynamically adjusts impedance parameters in response to the time-varying pulsed DC bias signal. By making impedance dynamic rather than static, the system adapts to changing load conditions and maintains optimal power transfer efficiency throughout the pulsed cycle.
Data Source
AI summary
A RF generator includes a RF power source. The RF power source outputs a time-varying signal to a load. At least one controller is coupled to the RF power source. The at least one controller is configured to generate an impedance control signal to control an impedance between the RF power source and the load. The at least one controller is further configured to generate the impedance control signal in response to a pulsed DC output signal from a second power source.