Research On Small Power, High Frequency Ultrasonic Biotreatment Device And Its Frequency Control

Ultrasonic technology was widely applied into biotreatment field because it has severalfeatures such as heating effect, chemical effect, mechanical effect, cavatition and it was safetyand environmental protection and efficient energy-saving. Due to the existing ultrasonicequipment with a single manner of working, big volume and low efficiency of biotreatment,the article used fourier series decomposition, buck chopper, power amplification, dataacquisition, serial communication and phase transformation to study and design a small powerand high frequency ultrasonic biotreatment device whose cybernetics core and displayplatform were respectively ATmega16and LabVIEW and also research its frequency control.The main contents of this article are as follows:(1) Types and parameters of thecomponent were obtained by analyzing each function module from different aspects, such asprecision, anti-jamming, price cost and so on.(2) Three working modes (frequency, pattern,and power) were studied in the design of this device based on ATmega16. The transform ofsquare signal to sinusoidal signal was achieved by using fourier series decomposition andelliptical filtering in the part of frequency. The series matching circuit and the matchinginductance switch circuit were improved for matching inductance of the synchronous switch.The composite control of pattern and power were realized by combining the diode and gatewith buck chopper adjustable power circuit. The whole hardware circuit and software designwere achieved and the simulation of the main circuit was also completed based on Proteus.(3)PC and PLC were researched in the design of the biotreatment equipment. The acquisition ofconcentration and temperature signal, the amplification and filtering of the signal,analog-digital conversion and reception-transmission and serial port level transformationwere accomplished in PLC. In PC, the communication between PC and PLC, waveformdisplay and the storage of the final results were completed.(4) Frequency calibration wasachieved by using the phase discriminator circuit and the strategy of digital control step fineadjustmengt, then it makes the device always work in resonant frequency in the part offrequency control.(5) Prototype of some circuits in this device was tested according totheoretical analysis and program design and the waveforms in every part were achieved.The results showed that this device has achieved the design of the source, the acquisitionof concentration and temperature signal, the communication between PC and PLC, resultsdisplay and so on. The experimental scheme has certain feasibility. This research has laid atheoretical and practical foundation for widening the research of ultrasonic technology in thefield of biotreatment and has high scientific and practical value.