HF Frequency Tuning Device Phase Control
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Solution Overview
Problem
Existing devices struggle to accurately and efficiently tune high frequency waves to resonate in cavities with high Q-values, especially when phase differences exceed the narrow range of −90 to 90 degrees, and are vulnerable to electric noise disruptions.
Innovation Solution
A high frequency wave frequency tuning device that includes a phase detecting section to generate sign data on phase differences and a controlling section to adjust the frequency, using multiple pitch values to invert the phase difference sign, allowing for robust control across a wider phase difference range and quick frequency adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional phase control technique is used to tune high frequency wave in cavity, then control is achieved when phase difference is within narrow range of -90 to 90 degrees, but the range of controllable phase difference is extremely narrow especially for high Q-value cavities
Solution Approach 1:
The invention changes the control parameter from phase difference (conventional method) to frequency shift (new method). By detecting the sign of phase difference and adjusting frequency accordingly, the system achieves controllable frequency tuning across the entire phase difference range of -180 to +180 degrees, resolving the limitation of narrow phase control range in high Q-value cavities
Solution Approach 2:
Instead of controlling phase difference directly within a narrow range as in conventional techniques, the invention inverts the approach by using frequency adjustment to indirectly control the resonant condition. The phase detecting section detects phase difference sign, and the frequency is shifted in the opposite direction of phase error, enabling wide-range control
2Measurement precision
If frequency tuning is performed in high Q-value cavity, then resonant frequency is highly selective, but the range of high frequency value within the phase difference range is extremely narrow
Solution Approach 1:
The invention transforms the control variable from phase (which has narrow usable range in high Q cavities) to frequency (which can be adjusted over a wide range). The frequency shifting mechanism allows the system to maintain precise resonant frequency locking while adapting to large frequency drifts caused by environmental changes
Solution Approach 2:
The invention implements a feedback control loop where the phase detecting section continuously monitors the sign of phase difference between traveling and reflected waves, and the controlling section adjusts frequency based on this feedback. This closed-loop system maintains high frequency accuracy while providing wide adaptation range
3Reliability
If conventional frequency control is used, then control is achieved within narrow phase difference range, but it is difficult to achieve controllable phase difference when environmental conditions cause resonant frequency shifts
Solution Approach 1:
The invention employs continuous feedback control where the phase detecting section monitors phase difference sign and the controlling section adjusts frequency in real-time. This feedback mechanism automatically compensates for environmental variations such as temperature changes that cause resonant frequency shifts, maintaining reliable operation under varying conditions
Solution Approach 2:
The invention performs preliminary frequency adjustment by detecting the sign of phase difference before the system operates outside the controllable range. The frequency is proactively shifted in the correct direction to prevent loss of control, rather than reacting after the problem occurs
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
Enables easier, faster, and more robust frequency tuning of high frequency waves in cavities with high Q-values, capable of adjusting frequencies across a broader phase difference range while being resilient to electric noise, facilitating precise X-ray generation in radiotherapy applications.
Implementation Method 1
a phase detecting section configured to generate a sign data which represents the sign of the phase difference between the traveling wave and the reflected wave included in the high frequency wave in the resonance cavity
Implementation Method 2
In order for the high frequency wave to resonate in a cavity, it is necessary for the frequency of the high frequency wave to match with that of the resonant frequency in the cavity with a high accuracy
Data Source
AI summary
An HF frequency tuning device includes a resonance cavity in which an HF is introduced, a phase detecting section which generates a sign data representing a sign of a phase difference between a traveling wave and a reflected wave included in the HF in the resonance cavity. The frequency of the HF is repeatedly shifted by a first pitch. The direction of the shift is determined by the sign data for reducing the phase difference. When the sign is inverted, the frequency of the HF is repeatedly shifted to the opposite direction by a second pitch smaller than the first pitch until the sign is inverted again. By this tuning process, the fine tuning of HF can by achieved in a short time.