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Theses

Dispositifs de puissance alimentant de multiples transducteurs piézoélectriques fonctionnant dans une gamme de fréquence de 1 à 3 MHz

Abstract : Since the discovery of piezoelectric effect in 1880 by the Curie brothers, sensors using this physical property or actuators using the reverse effect have rapidly emerged in the world of research –and technology. Piezoelectric actuators are specially the primary solution or even the only practical way for generating high frequency mechanical vibrations usually qualified as “ultrasound”. This thesis focuses particularly on high frequency and high-power ultrasonic transducers used for stabilizing mixture of immiscible liquids (emulsions). The studied emulsification system comprises several dozens of ultrasonic transducers. The transferred electrical power to each transducer is of the order of some dozens of watts and the operating frequency varies from one to 3 MHz depending on the transducer. The work carried out in this thesis focuses on electrical power supplies used to drive transducers of the emulsification system. The goal is to propose switched-mode power supply structures instead of classical power devices based on linear oscillators used to drive transducers at such high frequencies. Hence, the design and realization of high-frequency inverters, the electrical modeling of piezoelectric transducers and the interaction between the power supply and its load are studied in this thesis. At the end, a novel method of identification and tracking of the resonance frequency of ultrasonic transducers powered by voltage inverters is proposed.
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https://hal.univ-lorraine.fr/tel-02517344
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Submitted on : Tuesday, March 24, 2020 - 2:58:53 PM
Last modification on : Wednesday, April 1, 2020 - 8:40:21 PM

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  • HAL Id : tel-02517344, version 1

Citation

Hamidreza Zandi. Dispositifs de puissance alimentant de multiples transducteurs piézoélectriques fonctionnant dans une gamme de fréquence de 1 à 3 MHz. Energie électrique. Université de Lorraine, 2019. Français. ⟨NNT : 2019LORR0169⟩. ⟨tel-02517344⟩

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