Frequency search matching tracking method and system applied to broadband ultrasonic power supply

Abstract

The invention discloses a frequency search matching tracking method and system applied to a broadband ultrasonic power supply. The method mainly comprises the following steps: judging whether an absolute value of a difference between a current effective value of a current moment and a maximum value of a current effective value detected before the current moment is greater than a first threshold, if so, calculating a search frequency value at the next moment by using a fuzzy reasoning variable step size algorithm, or otherwise, calculating the search frequency value by using a linear variable step size algorithm; judging whether the search frequency value at the next moment reaches the highest search frequency value, if so, determining the search frequency value corresponding to the currentmaximum value as a resonant frequency value, or otherwise, continuing to iterate until the search frequency value at the next moment reaches the highest search frequency value; and adjusting the frequency value at the current moment according to the resonant frequency value, until the same-phase properties of a voltage phase and a current phase are satisfied when an ultrasonic transducer is at aresonant frequency point. The search matching tracking of the resonant frequency of the ultrasonic transducer within a wider frequency domain is achieved, the timeliness and accuracy of the search tracking are improved, and it is ensured that a resonant system is always in a stable resonant state.

Description

technical field [0001] The invention relates to the technical field of ultrasonic power supplies, in particular to a frequency search matching tracking method and system applied to broadband ultrasonic power supplies. Background technique [0002] Ultrasonic power supplies are usually called ultrasonic generators. At present, ultrasonic power supplies are widely used in ultrasonic cleaning, processing, diagnosis and other fields. The function of the ultrasonic power supply is to convert electrical energy into a high-frequency AC signal that matches the ultrasonic transducer. The ultrasonic transducer is a device that converts the electrical energy of super-audio frequency into mechanical vibration. Since the ultrasonic transducer is a capacitive load, impedance matching between the ultrasonic transducer and the ultrasonic generator is required to work in an optimal state. However, the traditional ultrasonic power supply will distort the output voltage due to the high-order ...

AI Technical Summary

Problems solved by technology

However, the traditional ultrasonic power supply will distort the output voltage due to the high harmonics contained, and the ambient temperature or the aging of components will cause the resonant frequency of the ultrasonic transducer to drift, making the resonant system detuned

The traditional solution is frequency tracking, but the traditional ultrasonic frequency tracking method often needs to search the resonance frequency of the ultrasonic power supply within a certain frequency range, which takes a lot of calculation time, resulting in a long transition period of the resonance system

[0003] Especially in the broadband ultrasonic power supply, the frequency search matching and tracking algorithm of the traditional ultrasonic power supply is often difficult to achieve the frequency tracking problem of ultrasonic transducers in different resonance frequency bands in the wide frequency domain, and in the search process of broadband signals, for off-resonance Signals with far-distant frequencies tend to have poorer signals, so the existing methods are not ideal for searching and detecting wide-band frequency signals

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