Plasma Generating Method Using Electronic Matching Device
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Solution Overview
Problem
Existing plasma generating methods face challenges in efficiently generating plasma due to limitations in impedance matching control speed, particularly in mechanically controlled matching devices, and in quickly adjusting radio-frequency power frequencies to achieve plasma generation.
Innovation Solution
A plasma generating method utilizing an electronically controlled matching device with parallel series circuits and switching elements, allowing for high-speed adjustment of radio-frequency power frequency to set the load side reactance to zero or near zero when plasma is not generated, thereby suppressing power reflection quickly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a mechanically controlled matching device is used to match impedance, then the device structure is simple, but the control speed of impedance is limited by the motor control speed
Solution Approach 1:
The patent replaces the mechanical motor-driven capacitor system with an electronically controlled switching system. Instead of using a motor to physically adjust capacitor plates, the invention uses switching elements (transistors or thyristors) to electronically control capacitance changes, eliminating mechanical movement and achieving high-speed impedance control without mechanical limitations.
Solution Approach 2:
The patent makes the matching device dynamically adjustable by using switching elements that can rapidly change the effective capacitance in response to plasma generation conditions. The switching elements allow the capacitance to be dynamically modified during operation, enabling fast adaptation to changing load conditions and achieving high-speed impedance matching.
2Loss of energy
If radio-frequency power frequency is adjusted to set load side reactance to zero when plasma is not generated, then power reflection is suppressed, but the response time is delayed due to mechanical matching device limitations
Solution Approach 1:
The patent replaces mechanical impedance adjustment with electronic switching control, allowing frequency and impedance changes to occur without mechanical delay. The switching elements can change state almost instantaneously, enabling the system to quickly adjust load side reactance to zero and suppress power reflection without the time penalty associated with mechanical motor operation.
Solution Approach 2:
The patent dynamically changes the electrical parameters (capacitance and frequency) of the matching device in response to plasma generation status. By using switching elements to rapidly modify capacitance values and adjusting the radio-frequency power supply frequency, the system can quickly achieve optimal impedance matching conditions that minimize power reflection, responding rapidly to changes in plasma state.
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 method effectively generates plasma by rapidly adjusting radio-frequency power frequencies, ensuring efficient plasma generation and minimizing power reflection, thus improving the plasma processing apparatus's performance.
Implementation Method 1
In order to excite the gas within the chamber to generate plasma, radio-frequency power is given from the radio-frequency power supply to the electrode
Data Source
AI summary
In a method of an embodiment, radio-frequency power is supplied to an electrode via a matching device from a radio-frequency power supply in order to generate plasma within a chamber. During the supply of the radio-frequency power, it is determined whether or not plasma is generated within the chamber from one or more parameters reflecting plasma generation within the chamber. When it is determined that plasma is not generated, a frequency of the radio-frequency power output from the radio-frequency power supply is adjusted to set the load side reactance of the radio-frequency power supply to zero or to bring the load side reactance close to zero.