title: Analysis of temperature rise for piezoelectric transformer using finite-element method.
abstract: Analysis of heat problem and temperature field of a piezoelectric transformer, operated at steady-state conditions, is described. The resonance frequency of the transformer is calculated from impedance and electrical gain analysis using a finite-element method. Mechanical displacement and electric potential of the transformer at the calculated resonance frequency are used to calculate the loss distribution of the transformer. Temperature distribution using discretized heat transfer equation is calculated from the obtained losses of the transformer. Properties of the piezoelectric material, dependent on the temperature field, are measured to recalculate the losses, temperature distribution, and new resonance characteristics of the transformer. Iterative method is adopted to recalculate the losses and resonance frequency due to the changes of the material constants from temperature increase. Computed temperature distributions and new resonance characteristics of the transformer at steady-state temperature are verified by comparison with experimental results.
authors.affiliation: Electromechanics Laboratory, School of Electrical Engineering and Computer Science, Seoul National University, San 56-1. Shillim-Dong, Kwanak-Gu, Seoul, Korea hwjoo74@snu.ac.kr
authors.forename: Hyun-Woo
authors.initials: HW
authors.lastname: Joo
authors.forename: Chang-Hwan
authors.initials: CH
authors.lastname: Lee
authors.forename: Jong-Seok
authors.initials: JS
authors.lastname: Rho
authors.forename: Hyun-Kyo
authors.initials: HK
authors.lastname: Jung