Plasma Ignition Control Using Pulsed Voltage and RF Feedback
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Solution Overview
Problem
Existing plasma discharge devices suffer damage and introduce impurities during initial discharge due to inadequate ignition assistance methods, necessitating a solution that minimizes device damage and impurity production.
Innovation Solution
A plasma generation device with a chamber, antenna module, electrode, sensor, and controller that applies RF voltage, senses plasma status, and controls power sources to manage pulsed voltage application based on sensing information, ensuring controlled initial discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional ignition assistance methods (ignitor or high power input) are used to assist initial discharge of plasma, then plasma discharge can be initiated, but device damage occurs and impurities are introduced to generated active species
Solution Approach 1:
The system applies a preliminary high voltage pulse to the electrode before applying RF power to the antenna module. This preliminary action creates initial plasma discharge that facilitates subsequent RF-driven plasma generation, avoiding the need for high power input or ignitors during the critical ignition phase and thereby preventing device damage and impurity production
Solution Approach 2:
The system uses periodic pulsing of high voltage to the electrode in conjunction with RF power application. The controller applies voltage pulses at specific intervals and durations, creating controlled discharge events that initiate plasma without sustained high power exposure, thus avoiding device damage while ensuring reliable plasma generation
2Productivity
If high power is input to assist initial discharge of plasma, then plasma can be generated, but device damage occurs
Solution Approach 1:
Instead of applying high power continuously, the system applies a brief preliminary high voltage pulse to initiate discharge, then transitions to lower power RF-driven plasma generation. This preliminary action provides the necessary kickstart for rapid plasma generation while the reduced sustained power level protects device components from damage
Solution Approach 2:
The system dynamically changes power parameters during operation: applying high voltage pulses at specific moments for ignition assistance, then adjusting to sustained RF power levels that maintain plasma without causing device damage. The controller monitors plasma status and adjusts voltage and power parameters in real-time to optimize both plasma generation speed and device durability
3Reliability
If ignitor is used to assist initial discharge of plasma, then plasma discharge can be initiated, but impurities are introduced to generated active species
Solution Approach 1:
The system removes the ignitor component from the plasma generation process entirely. Instead of using an ignitor to assist discharge, the system relies on the combination of high voltage pulsing to the electrode and RF power to the antenna module to initiate and sustain plasma, thereby eliminating the source of impurity introduction while maintaining reliable plasma discharge initiation
Solution Approach 2:
The system enables the plasma discharge to initiate itself through the synergistic effect of high voltage pulsing and RF power application, without requiring an external ignitor. The electrode and antenna module work together to create the conditions for self-initiated plasma discharge, ensuring purity of active species while maintaining reliable ignition
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 device enables rapid plasma discharge with reduced impurity production by optimizing power source control based on plasma status feedback.
Implementation Method 1
The inductively coupled plasma method is a method of forming an induced electric field by applying RF power to a coil and of performing plasma discharge through the induced electric field
Implementation Method 2
a sensor configured to obtain sensing information related to a status of the plasma
Data Source
AI summary
According to one embodiment of the present specification, there can be provided an apparatus for generating plasma, comprising: a chamber configured to provide a generating space for the plasma; an antenna module placed adjacent to the chamber and configured to be connected to a first power source and generate induced electric field in the chamber; an electrode placed adjacent to the chamber and configured to be connected to a second power source and assist in a generation of the plasma; a sensor configured to obtain sensing information related to a status of the plasma; and a controller configured to control the first power source and the second power source.