Design of Piezoelectric Transformers for Power Converters by Means of Analytical and Numerical Methods

Sánchez, Almudena M. and Sanz, Marina and Prieto López, Roberto and Oliver Ramírez, Jesús Angel and Alou Cervera, Pedro and Cobos Márquez, José Antonio (2008). Design of Piezoelectric Transformers for Power Converters by Means of Analytical and Numerical Methods. "IEEE Transactions on Industrial Electronics", v. 55 (n. 1); pp. 79-88. ISSN 0278-0046. https://doi.org/10.1109/TIE.2007.896513.

Description

Title: Design of Piezoelectric Transformers for Power Converters by Means of Analytical and Numerical Methods
Author/s:
  • Sánchez, Almudena M.
  • Sanz, Marina
  • Prieto López, Roberto
  • Oliver Ramírez, Jesús Angel
  • Alou Cervera, Pedro
  • Cobos Márquez, José Antonio
Item Type: Article
Título de Revista/Publicación: IEEE Transactions on Industrial Electronics
Date: January 2008
ISSN: 0278-0046
Volume: 55
Subjects:
Freetext Keywords: FEA tools ac-dc converter energy transference finite element analysis manufacturing tolerances mobile phone battery charger numerical methods piezoelectric transformers power converters voltage isolation capability
Faculty: E.T.S.I. Industriales (UPM)
Department: Automática, Ingeniería Electrónica e Informática Industrial [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Piezoelectric transformers (PTs) provide several advantages compared to magnetic components, which are higher power density, lower radiated noise, and higher voltage isolation capability. PT must be properly designed to benefit the power converter with the aforementioned advantages. Analytical models are widely used for PT design in order to validate it before constructing the prototype. In this paper, the additional usefulness of finite element analysis (FEA) for PT design is shown. With FEA, it is possible to optimize the PT design not only by maximizing the energy transference but also by cleaning the working frequency range of spurious modes (geometrical 2D/3D effects). Moreover, FEA tools allow the study of other main aspects of the PT design such as manufacturing tolerances or the influence of the fixing layer on PT performance (which is a critical design point). A method for modeling and designing PTs is proposed, combining analytical 1D models and FEA results. The proposed method is validated with measurements of a PT design for a 10-W ac/dc converter prototype for mobile phone battery charger.

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