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| Study on phase locking ring in new ultrasonic generator |
| WEI Qian, CHENG Zhixin, HAN Aimin |
| Shandong Academy of Pharmaceutical Science, Jinan 250101 China |
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Abstract Objective Track the resonance frequency of the transducer by using the technique of phase lock loop to make the transducer work normally and stably in the resonant state.Methods Based on the tracking method of phase difference,the sampling voltage and sampling current are measured,compared, and shaped by the phase detection circuit to assure the phase of the sampling signal in the same position,and the phase difference to be zero.Results The detection circuit designed in this work uses the oscilloscope to detect the voltage current signal in real time,and the voltage current signal is in the same phase to realize the frequency automatic tracking function.Conclusion The system design is simple and stable,and can be applied to the frequency automatic tracking system of low frequency ultrasonic equipment.
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Received: 20 June 2018
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