Design of an automatic impedance matching circuit based on frequency tracking of ultrasonic transducer

Ultrasound is widely used in ultrasonic detection, ultrasonography, ultrasonic oscillation, ultrasound extraction and so on. During the use of power ultrasonic transducer, the resonance frequency of the transducer tends to shift due to the changes of transducer load, aging, wear, temperature rise, fatigue and other factors. At present, there are a large number of circuit designs for automatic frequency tracking of ultrasonic transducers, but few design schemes for automatic adjustment and control of impedance matching circuit. This paper designs a circuit which can automatically adjust impedance matching based on automatic tracking of ultrasonic frequency.