Analysis of temperature rise for piezoelectric transformer using finite-element method

• Published in: IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2006-08, Vol.53 (8), p.1449-1457
• Main Authors: JOO, Hyun-Woo, LEE, Chang-Hwan, RHO, Jong-Seok, JUNG, Hyun-Kyo
• Format: Article
• Language: English
• Subjects: Acoustics; Constants; Electric potential; Exact sciences and technology; Finite element method; Finite element methods; Fundamental areas of phenomenology (including applications); Gain; General equipment and techniques; Heat transfer; Impedance; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Mathematical analysis; Physics; Piezoelectricity; Resonance; Resonant frequency; Steady-state; Temperature distribution; Temperature measurement; Transducers; Transformers; Ultrasonics, quantum acoustics, and physical effects of sound; Voltage transformers
• ISSN: 0885-3010; 1525-8955
• DOI: 10.1109/TUFFC.2006.1665102

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.