METHODS FOR STABILIZING THE RESONANT MODE OF PIEZOELECTRIC TRANSDUCERS IN PLL-BASED SYSTEMS

DOI: 10.31673/2786-8362.2025.022812

Abstract

This paper investigates the
impedance matching of piezoceramic ultrasonic transducers with power amplifier stages operating near
mechanical resonance frequencies. The study emphasizes the importance of achieving both a purely active
input impedance and stable vibration amplitude under varying load conditions, which are critical for highefficiency ultrasonic generators and automatic control systems such as phase-locked loops (PLL). The
analysis includes equivalent circuit modeling, evaluation of matching filters, and phase characteristics to
identify conditions for resonance stability. Furthermore, the paper proposes an approach for generating a
feedback signal with a 90° phase shift, enabling PLL-based control for automatic resonance tracking. The
findings demonstrate that conventional inductive matching filters cannot simultaneously satisfy the
requirements for active impedance and phase shift, but advanced configurations can improve performance.
These results contribute to the development of more efficient ultrasonic generators capable of maintaining
stability and energy efficiency under dynamic operating conditions.
Keywords: piezoceramic transducer, impedance matching, ultrasonic generator, resonance
frequency, matching filter, phase-locked loop (PLL), electromechanical characteristics

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