Ion Engine Frequency Generator Resonance Tracking Control
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Solution Overview
Problem
Ion engines face challenges in maintaining resonant frequency stability due to plasma ignition, leading to potential plasma extinction or failure to ignite, caused by changes in the resonant frequency of the resonant circuit.
Innovation Solution
A control device for a frequency generator that acquires and processes voltage and current waveforms to determine temporal offsets between rising edges, generating switching signals to adjust the switch-on time based on the imbalance between positive and negative offsets, ensuring operation at resonant frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the resonant circuit is operated at its resonant frequency, then power losses are minimized and plasma ignition is maintained, but the resonant frequency changes when plasma is ignited, causing the circuit to deviate from resonance
Solution Approach 1:
The control device continuously monitors the voltage and current waveforms of the resonant circuit, determines the temporal offset between them, and adjusts the switching signal based on this feedback to maintain resonance despite plasma ignition changes
Solution Approach 2:
The system automatically detects and corrects its own frequency deviations by analyzing the temporal offset between voltage and current waveforms and self-adjusting the switching signal without external intervention
2Reliability
If the resonant frequency is not tracked accurately, then the frequency generator cannot adapt to plasma ignition changes, but complex frequency tracking mechanisms increase device complexity
Solution Approach 1:
The patent replaces complex mechanical or electronic frequency tuning mechanisms with a digital processing approach that uses simple waveform sampling and temporal offset calculation to achieve accurate frequency tracking
Solution Approach 2:
The control device changes the switching signal parameters (timing and duration) based on the detected temporal offset, allowing the system to adapt to frequency changes without adding complex hardware
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 precise adjustment of the resonant frequency, minimizing power losses and maintaining plasma ignition, thereby enhancing the efficiency and reliability of ion engines.
Implementation Method 1
In the so-called radio-frequency ion engine, the ions are generated by means of inductive coupling of a high-frequency signal
Implementation Method 2
In order to generate this high-frequency signal, usually a resonant circuit or frequency generator is used
Data Source
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Figure 3~4
AI summary
A control device (100) for a frequency generator (50) is provided. The control device (100) comprises an acquiring unit (110) and a processing unit (120). The acquiring unit (110) is configured to acquire a voltage course and a current course of a determinable number of periods of the frequency generator (50) and to transmit these to the processing unit (120). The processing unit (120) is configured to determine a temporal offset (Δt1) between a rising edge of the current course and a rising edge of the voltage course for each period of the determinable number of periods, and further to determine if this temporal offset (Δt1) is positive or negative. The processing unit is furthermore configured to determine a difference between the number of periods with positive temporal offset and the number of periods with negative temporal offset within the determinable number of periods, and to generate and adapt a switching signal for a switch-on time of the voltage course if the number of periods with positive temporal offset differs from the number of periods with negative temporal offset.