Balanced Amplifier Phase Switching for Plasma Ignition
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Solution Overview
Problem
Balanced amplifiers used in plasma and laser systems face challenges in achieving reliable ignition while maintaining high efficiency during normal operation, as they struggle to generate power peaks necessary for ignition without incurring significant energy losses.
Innovation Solution
The method involves a balanced amplifier with at least two amplifier paths and a coupler that adjusts phase relationships to supply power to either the output terminal or the isolation terminal. By setting specific phase relationships for ignition and normal operation, the system can achieve reliable ignition with minimal energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a balanced amplifier is operated with a 90° phase offset during normal operation, then power is efficiently coupled to the output terminal, but power peaks cannot be generated for ignition
Solution Approach 1:
The patent applies dynamics by making the phase relationship between amplifier paths adjustable rather than fixed. The system dynamically switches between a first phase relationship (e.g., 0° or small phase difference) for ignition mode to generate power peaks, and a second phase relationship (90° phase offset) for normal operation mode to achieve efficient power coupling and minimize losses. This dynamic adaptability resolves the contradiction between ignition reliability and energy efficiency.
2Reliability
If a higher DC supply voltage is used to generate power peaks for ignition, then ignition can be achieved, but the system complexity increases significantly
Solution Approach 1:
The patent applies parameter changes by modifying the phase relationship parameter between amplifier paths instead of changing the DC supply voltage. By adjusting the phase relationship from a first value (for ignition) to a second value (for normal operation), the system generates power peaks through phase control rather than voltage escalation. This approach achieves reliable ignition while maintaining simpler power supply requirements and avoiding the complexity of generating higher DC voltages.
3Reliability
If the phase relationship is changed for ignition, then power peaks can be generated, but power is lost to the isolation terminal during normal operation
Solution Approach 1:
The patent uses dynamics to switch the phase relationship between amplifier paths based on operational mode. During ignition, the system uses a first phase relationship to direct power to the isolation terminal for creating power peaks. During normal operation, it switches to a second phase relationship (90° offset) that directs power efficiently to the output terminal while minimizing losses to the isolation terminal. This dynamic switching resolves the contradiction between ignition capability and energy efficiency.
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
This approach allows for efficient ignition of plasmas or lasers with balanced amplifiers, maintaining high efficiency during normal operation by minimizing power loss and optimizing power distribution.
Implementation Method 1
the coupler combines the signals of the at least two amplifier paths as a function of a phase relationship between the signals and supplies a power as the first power to the output terminal and/or as a second power to the isolation terminal as a function of the phase relationship between the signals
Implementation Method 2
A processing plasma, i.e. a plasma for processing workpieces, is often excited by radiofrequency energy with frequencies of greater than or equal to 2 MHz and high power, e.g. greater than or equal to 3 kW, in a discharge chamber
Implementation Method 3
Such a radiofrequency energy is used in a comparable manner for supplying a laser in a discharge chamber
Data Source
AI summary
A method includes providing a first power from an output terminal of a balanced amplifier to a discharge chamber. The balanced amplifier includes two amplifier paths, each of which supplies a signal to a coupler. The coupler is configured to combine the signals as a function of their phase relationship and supply a power as the first power to the output terminal and/or as a second power to an isolation terminal. The method further includes setting a first phase relationship between the signals for a predefined time in order to ignite the plasma, and setting a second phase relationship in order to maintain the plasma. Under the second phase relationship, substantially an entirety of the power is supplied to the output terminal. Under the first phase relationship, a third power reflected from the discharge chamber is reflected back to the discharge chamber in a proportion large enough for the ignition.