Modeling of an electro-mechanical-acoustic contactless energy transfer system based on multiphysics networks and resonant topologies
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Data
2021-05-17Primeiro membro da banca
Álvarez, José Marcos Alonso
Segundo membro da banca
Lopes, Juliano de Pelegrini
Terceiro membro da banca
Martins, Mário Lúcio da Silva
Quarto membro da banca
Beltrame, Rafael Concatto
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This doctoral thesis shows a modeling methodology for an electro-mechanicalacoustic contactless energy transfer system and the analysis and design of its power
conversion circuits. Contactless energy transfer systems (CET) are mainly divided into
acoustic, inductive, capacitive and optical, which main applications related to biomedical
and wireless chargers. The electro-mechanical-acoustic CET system is composed of: an
ultrasound transmitter and a receiver based on piezoelectricity, a transfer media and a
power conversion circuit. Due to the multi-domains, like as electrical, mechanical and
acoustical, a multiphysics scenario is depicted. Modeling of such system requires a welldefined methodology. In this sense, this work presents an analytical multiphysical model
based on lumped parameters. The model is based on the geometry and properties of the
materials. By means of a decomposition into unit-less parameters scheme, the system is
represented by a normalized state-space model. The model leads to solutions that do not
depend on design specifications and do not rely on real system parameters. This work
shows an equivalent electrical model that can be converted into a piezoelectric transformer model, which is used as part of the resonant tank in resonant topologies. This allows
the design of power conversion circuits in order to manage the transfered electrical power.
Furthermore, an augmented-order multiphysical model is proposed as an enhancement
of the previous models. The models are evaluated for different scenarios and an error
analysis is conducted based on the comparison between the experimental response of the
physical system and the theoretical results. Resonant topologies are used as representation of the system and the generalized averaged dynamic modeling is performed for the
Class-E²
resonant converter. A practical demonstrator including the piezoelectric ultrasound transmitter and receiver, solid transfer media, and the power conversion circuitry
was assembled in order to evaluate the feasibility of the system for practical applications.
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