High-Frequency Power Control for Fast Plasma Impedance Matching
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Solution Overview
Problem
Conventional high-frequency power devices for plasma processing face challenges in impedance matching during discharge, leading to increased reflection, mechanical longevity issues with variable impedance elements, high production costs, and slow impedance matching times, as well as complexity in configuration due to the need for automatic matching units and discharge detecting systems.
Innovation Solution
A high-frequency power device that eliminates the need for automatic matching units by varying the oscillation frequency to minimize the reflection coefficient, using a fixed matching unit and a discharge signal output unit to control the oscillation frequency based on reflection coefficient calculations, allowing for instantaneous impedance matching during discharge without mechanical wear and reducing production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an automatic matching unit with variable impedance elements is used for impedance matching, then impedance matching capability is improved, but mechanical wear increases and service life decreases
Solution Approach 1:
The patent replaces the mechanical variable impedance elements (variable capacitors and inductors) with an electronic frequency control system. The frequency controlling circuit adjusts the oscillation frequency of the oscillation circuit to achieve impedance matching, eliminating mechanical moving parts and their associated wear problems. This substitution of mechanical adjustment with electronic frequency control resolves the contradiction between matching capability and reliability.
2Adaptability or versatility
If an automatic matching unit with variable impedance elements is used for impedance matching, then impedance matching capability is improved, but device complexity and production costs increase
Solution Approach 1:
The patent extracts and eliminates the complex automatic matching unit with its variable impedance elements from the system. Instead, it retains only the essential oscillation circuit and adds a frequency controlling circuit, significantly simplifying the overall device structure while maintaining impedance matching capability through frequency adjustment rather than impedance transformation.
Solution Approach 2:
The frequency controlling circuit serves multiple functions: it controls the oscillation frequency for impedance matching, replaces the need for separate automatic matching units, and provides a unified control mechanism that simplifies the overall system architecture, reducing both complexity and production costs.
3Adaptability or versatility
If variable impedance elements are used for impedance matching during discharge, then impedance matching is achieved, but matching time increases
Solution Approach 1:
The patent replaces mechanical impedance adjustment with electronic frequency control. The frequency controlling circuit can instantaneously or rapidly adjust the oscillation frequency electronically, eliminating the mechanical adjustment time required by variable impedance elements. This electronic control mechanism achieves impedance matching much faster than mechanical systems, resolving the time loss contradiction.
4Measurement precision
If a discharge detecting unit is used to control frequency changes, then discharge detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent makes the frequency controlling circuit self-regulating by using the inherent characteristics of the oscillation circuit and load. The system automatically adjusts frequency based on feedback from the load conditions without requiring external discharge detection equipment. This self-service approach maintains detection accuracy while eliminating additional complex components.
Solution Approach 2:
The frequency controlling circuit incorporates feedback mechanisms that monitor the operational state of the load and automatically adjust the oscillation frequency accordingly. This feedback system provides accurate discharge detection and control without requiring separate detecting units, maintaining precision while simplifying the overall device configuration.
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 solution enables longer service life, lower production costs, and faster impedance matching, simplifying the device configuration by eliminating the need for discharge detecting units and variable impedance elements, while maintaining stable plasma conditions.
Implementation Method 1
a high-frequency power device for supplying power to a load such as a plasma processing unit, etc., which is employed for applications accompanying discharge
Implementation Method 2
high-frequency power (voltage) supplied from the high-frequency power device 50 is applied to the plasma discharge gas, the load 5 discharges the plasma discharge gas to bring a non-plasma state into a plasma state
Data Source
AI summary
A high-frequency power device including: an oscillator; a high-frequency power supplier; a reflection coefficient calculator; a discharge signal output unit; and a frequency controller, wherein the frequency controller: instructs the oscillator to oscillate the oscillation signal at a first oscillation frequency for the period of time while a discharge signal is not in a state showing that the discharge has been commenced or in a state where the discharge is regarded as having been commenced; then instructs the oscillator to change the first oscillation frequency to a second oscillation frequency immediately after the discharge signal changes into the states; and then controls the oscillation frequency so that the absolute value is made small.