Plasma Impedance Matching Network for Fast Wide-Range Tuning
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Solution Overview
Problem
Existing impedance matching networks struggle to adapt quickly and accurately to the significant and rapid changes in plasma impedance during ignition and stabilization, leading to inefficiencies in power transfer.
Innovation Solution
An impedance matching network with a combination of adjustable and non-adjustable reactance sets, utilizing fast electronic switches and motor-driven variable capacitors, allows for rapid and precise impedance tuning, covering a broad range of operational states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only adjustable reactances are used for impedance matching, then the impedance can be tuned continuously, but the tuning speed is slow due to mechanical adjustment mechanisms
Solution Approach 1:
The impedance matching network is divided into two separate reactance sets: a first reactance set with adjustable reactances for continuous impedance tuning, and a second reactance set with fixed reactances for fast switching. This segmentation allows each subset to specialize in one function, resolving the contradiction between continuous tuning capability and fast tuning speed.
Solution Approach 2:
The system dynamically switches between different reactance configurations by selectively connecting or disconnecting reactances from the transmission line using electronic switches. This dynamic reconfiguration enables fast impedance adaptation without relying solely on slow mechanical adjustment of variable capacitors.
2Speed
If only fixed reactances are used for impedance matching, then the switching speed is fast, but the impedance tuning range is limited
Solution Approach 1:
The impedance matching network is divided into two separate reactance sets: a first reactance set with adjustable reactances for continuous impedance tuning, and a second reactance set with fixed reactances for fast switching. This segmentation allows each subset to specialize in one function, resolving the contradiction between continuous tuning capability and fast tuning speed.
3Device complexity
If mechanical switches are used to switch reactances, then the structure is simple, but the switching time is too slow to track rapid plasma impedance changes
Solution Approach 1:
The patent replaces mechanical switches with solid-state electronic switches (such as MOSFETs or PIN diodes) to control the connection and disconnection of reactances. This substitution eliminates mechanical moving parts, reducing switching time from the millisecond range to the microsecond or nanosecond range, enabling the system to track rapid plasma impedance changes during ignition and stabilization.
Data Source
AI summary
An impedance matching network for plasma processes includes an input port, an output port, and a transmission line that connects the output port to the input port. The network includes a first impedance matching circuit configured to connect at least one reactance to the transmission line. The first impedance matching circuit includes a first reactance set and a second reactance set. The first reactance set includes least one adjustable reactance, wherein an impedance of the at least one adjustable reactance is adaptable. The second reactance set includes least one non-adjustable reactance, wherein an impedance of the at least one non-adjustable reactance is fixed. The first reactance set and the second reactance set are arranged in parallel to each other. The first impedance matching circuit is configured to switch reactances of the first reactance set and of the second reactance set to the transmission line independent of each other.