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Study on the Parallel Electric Matching of High Power Piezoelectric Transducers

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For high power piezoelectric transducers, resonant frequency tracking and impedance matching are necessary in order to obtain high energy transmission efficiency and stable working state. When a piezoelectric transducer is excited near its resonance frequency, the input electric impedance is capacitive. In order to compensate the capacitive impedance and increase the power factor, inductive matching circuit should be used, and it can be connected with the transducer in series or parallel. In this paper, the effect of the parallel matching inductor on the piezoelectric transducer is analyzed. The dependency of the resonance/anti-resonance frequency, the effective electromechanical coupling coefficient, the electric quality factor and the electroacoustic efficiency on the matching inductor is obtained. It is shown that when the parallel matching inductor is increased, the anti-resonance frequency is decreased and the resonance frequency unchanged; the effective electromechanical coupling coefficient and the electric quality factor are decreased; the electroacoustic efficiency at resonance frequency is unchanged and increased at anti-resonance frequency. The electric quality factor at resonance is less than that at anti-resonance. The electroacoustic efficiency at resonance frequency is larger than that at anti-resonance frequency. It is shown that the theoretically predicted relationship between the electromechanical characteristics and the parallel matching inductor is in good agreement with the experimental results.
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Document Type: Research Article

Publication date: May 1, 2017

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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