Balanced Amplifier Ignition Power Control

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Solution Overview

Problem

Balanced amplifiers used in plasma processing systems face issues with uneven power dissipation during plasma ignition and reignition, leading to potential damage due to load mismatch, limiting the achievable power levels compared to traditional single amplifiers.

Innovation Solution

Implementing a method that temporarily raises protection limits during the ignition period and pulsing power delivery, allowing higher power delivery while protecting the amplifier from damage, by using a balanced amplifier with a measurement and control system to monitor and adjust power output based on plasma characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If balanced amplifier power profile is reduced to protect against uneven power dissipation during load mismatch, then amplifier reliability is improved, but plasma ignition capability deteriorates

Engineering Contradiction:

Improveamplifier reliabilityVSAvoidplasma ignition power

Core Design Contradiction:

ReliabilityVSPower

Solution Approach 1:

The protection limit is made dynamic rather than fixed. The system temporarily raises the protection limit during the ignition period when high power is needed, then reduces it to normal levels during steady-state operation. This dynamic adjustment allows the amplifier to deliver high power during ignition without compromising long-term reliability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system implements periodic modulation of the protection limit parameter, switching between a raised limit during ignition periods and a reduced normal limit during steady-state operation. This periodic action aligns with the plasma ignition cycle, providing high power when needed while maintaining protection during normal operation

Inventive Principle:

Principle #19Periodic action

2Object-affected harmful factors

If balanced amplifier power profile is reduced to prevent damage during load mismatch, then amplifier protection is improved, but power delivery capability deteriorates

Engineering Contradiction:

Improveamplifier damage protectionVSAvoidpower delivery to plasma

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The protection limit parameter is dynamically adjusted based on operational phase. During ignition when load mismatch occurs, the limit is temporarily raised to allow high power delivery. During steady-state operation with matched loads, the limit is reduced to normal protective levels, preventing damage while enabling full power capability when needed

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS9536713B2Reliable plasma ignition and reignition

Publication Date: 2017.01.03 AES GLOBAL HLDG PTE LTD

AI summary

This disclosure describes systems, methods, and apparatus for ensuring desirable ignition of plasma in a plasma processing chamber via providing increased instantaneous power during an ignition period for both continuous wave (CW) and pulsed power delivery. The systems, methods, and apparatus can be applied to both initial ignition of a plasma and reignition of a plasma where pulsed power delivery leads to periodic extinction of the plasma.