Ultrasonic Transducer Frequency Tracking via Phase Difference Change Rate
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Solution Overview
Problem
Existing frequency tracking methods for ultrasonic transducers fail to account for phase differences that exceed the target phase difference, leading to frequency locking failures and impaired device performance.
Innovation Solution
A frequency tracking method that calculates phase difference change rates to adjust operating frequencies, incorporating phase difference determination and judgment units to ensure accurate frequency locking, using formulas to determine frequency adjustments based on phase difference and impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conventional frequency tracking method using phase difference of voltage and current is used, then the frequency tracking works normally in the range from point B to point C, but frequency locking failure occurs when the minimum phase difference is greater than the target phase difference
Solution Approach 1:
The patent changes the tracking parameter from phase difference to phase difference change rate. By using the derivative of phase difference with respect to frequency (dθ/df), the system can reliably track frequency even when the minimum phase difference exceeds the target phase difference, thus resolving the frequency locking failure issue
Solution Approach 2:
The patent replaces the conventional phase difference-based tracking mechanism with a phase difference change rate-based mechanism. This substitution allows the system to overcome the limitation where minimum phase difference > target phase difference, improving both reliability and adaptability
2Reliability
If the ultrasonic transducer operates at high temperature or changes environment during use, then the resonant frequency shifts due to aging, but the conventional tracking method cannot adapt when phase difference conditions change
Solution Approach 1:
The patent implements a feedback mechanism using phase difference change rate to continuously adjust and track the resonant frequency. By monitoring how the phase difference changes with frequency and using this rate information, the system can adapt to temperature variations and environmental changes, maintaining reliable frequency tracking
Solution Approach 2:
The patent transitions from a static phase difference comparison method to a dynamic phase difference change rate method. This dynamic approach allows the system to adapt to changing environmental conditions and temperature variations, improving tracking stability under varying operating conditions
Data Source
AI summary
A frequency tracking method and system for ultrasonic transducer and an ultrasonic device are disclosed. The frequency tracking method for ultrasonic transducer includes the following steps: calculating the phase difference of voltage and current based on acquired voltage and current signals; determining whether the phase difference of the voltage and current is greater than a target phase difference; if not, reducing the operating frequency and calculating the adjusted operating frequency; if yes, calculating a phase difference change rate, determining whether to increase or decrease the operating frequency based on the phase difference change rate, and calculating the adjusted operating frequency. When performing ultrasonic transducer frequency tracking, the method uses the phase difference change rate to distinguish the working state of the ultrasonic transducer, thereby avoiding the problem that frequency locking fails because the minimum value of the phase difference of voltage and current corresponding to the working frequency range is greater than the phase-locking phase, and that the ultrasonic device is unable to work normally. At the same time, automatic frequency tracking is effectively realized, and the working efficiency and stability of the ultrasonic device are improved.