Ultrasonic screening transducer resonance frequency self-locking and real-time correction method and ultrasonic screening transducer power supply circuit

Abstract

The invention relates to an ultrasonic frequency locking and correction method and a power supply circuit of a screening system. The method for self-locking and real-time correction of the resonant frequency of the ultrasonic screening transducer of the present invention adopts the digital frequency scanning frequency locking method under the condition of constant current source power supply according to the characteristics of the transducer load resonant circuit, and utilizes digital frequency synthesis and DC high voltage terminal. The isolation detection technology realizes the locking of the resonant frequency of the transducer through frequency scanning and extreme value judgment; during the operation of the ultrasonic power supply, the automatic triggering method of the voltage deviation value of the constant current source terminal is used to correct the ultrasonic output frequency in real time; according to different frequency points The voltage of the power supply terminal is changed, and the resonant frequency of the transducer is found out by the extreme value judgment method, and then the DDS circuit is controlled to make the transducer work at the resonant frequency. The ultrasonic power supply works in constant current mode and has high output frequency accuracy, which solves the technical problems of unstable output frequency of ultrasonic power supply, poor interchangeability of transducers and low efficiency of ultrafine powder screening in the current screening system.

Description

technical field [0001] The invention relates to a method for ultrasonic frequency locking and correction of a screening system, in particular to a method for automatic locking and real-time correction of the resonance frequency of an ultrasonic screening transducer and its power supply circuit. Background technique [0002] Ultrasonic vibrating screen sieves tiny particles through high-frequency vibration, which effectively solves the screening problems of micro-powder materials such as strong adsorption, easy agglomeration, high static electricity, and light specific gravity, especially in the production of ultra-fine materials. High screening efficiency, so ultrasonic screening technology is widely used in food, chemical, pharmaceutical, metal, gunpowder, ceramics, lithium battery, paint, graphene and other industries. [0003] With the continuous expansion of the application field of micropowder materials, the application of ultrasonic screening technology has also develo...

AI Technical Summary

Problems solved by technology

[0011] Aiming at the deficiencies in the prior art, the present invention proposes a method for self-locking and real-time correction of the resonance frequency of the ultrasonic screening transducer, which can realize the automatic correction of the frequency of the screening transducer under the condition of uninterrupted operation of the ultrasonic power supply, and solves the problem of current screening transducers. In the sub-system, there are technical problems such as unstable output frequency of ultrasonic power supply, poor interchangeability of transducers, and low efficiency of ultra-fine powder screening;

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