Balanced Amplifier Ignition via Isolation Impedance Switching
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Solution Overview
Problem
Existing plasma and laser systems using balanced amplifiers face challenges in achieving reliable ignition due to the difficulty in generating power peaks, which are necessary for igniting the plasma or laser.
Innovation Solution
The method involves using an impedance switching arrangement connected to the isolation terminal of a combiner in a balanced amplifier. This arrangement is actuated in a first mode to short-circuit or disconnect the impedance, allowing multiple reflections of power and generating a sufficient power peak for ignition, and in a second mode to operate the plasma or laser.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a balanced amplifier is used to supply power to the discharge chamber, then the output power is essentially constant and stable, but power peaks necessary for ignition cannot be generated
Solution Approach 1:
The patent applies the dynamics principle by making the impedance at the isolation terminal adjustable rather than fixed. The impedance switching arrangement allows the system to dynamically change its impedance state between two modes: a first mode during ignition that enables power peaks, and a second mode during operation that maintains constant power. This dynamic adaptation resolves the contradiction between needing power peaks for ignition and maintaining stable power during operation.
Solution Approach 2:
The patent implements parameter changes by modifying the impedance parameter at the isolation terminal of the combiner. By switching between different impedance values (first impedance state vs. second impedance state), the system can generate power peaks during ignition when needed, then transition to a stable impedance state for continuous operation. This parameter adjustment directly addresses the inability of conventional balanced amplifiers to produce ignition-required power peaks.
2Power
If a higher DC supply voltage is used to generate power peaks, then ignition power is increased, but the system complexity increases significantly
Solution Approach 1:
Instead of changing the DC supply voltage parameter to generate power peaks, the patent changes the impedance parameter at the isolation terminal. This approach achieves the same goal of generating power peaks for ignition but through a simpler impedance switching mechanism rather than complex high-voltage DC supply modifications, thereby reducing system complexity while maintaining ignition capability.
3Power
If unbalanced amplifiers are used to achieve impedance for ignition, then power peaks can be generated, but numerous other disadvantages arise
Solution Approach 1:
The patent segments the amplifier system into two distinct operational modes handled by the same balanced amplifier structure: ignition mode and operation mode. By using the impedance switching arrangement to create these separate modes within the balanced amplifier framework, the system achieves the ignition power peaks typically associated with unbalanced amplifiers while retaining the advantages of balanced amplifier architecture, thus avoiding the numerous disadvantages of unbalanced amplifiers.
Data Source
AI summary
A method for igniting and supplying a laser or a processing plasma in a discharge chamber with electrical power includes providing a power from an output terminal of an amplifier to the discharge chamber. The amplifier includes two amplifier paths, each of which supplies a respective signal to a combiner. The combiner is configured to combine the signals as a function of an amplitude relationship and/or a phase relationship between the signals and to supply the power to the output terminal and/or an isolation terminal. The method further includes actuating an impedance switching arrangement connected to the isolation terminal and a ground according to a first actuation mode in order to ignite the laser or the processing plasma, and actuating the impedance switching arrangement according to a second actuation mode in order to operate the laser or maintain the processing plasma in the discharge chamber.