Design Consideration of Parallel–Parallel Connected Piezoelectric Transformer for Thermal Balance

概要

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Recently, the multiple-connected piezoelectric transformer (PT) is considered as significant research topic especially for power processing applications. However, there is a power balance issues closely related to thermal failure of PT. To avoid the thermal imbalance between PTs, a design specification of thermal characteristic parameters of piezoelectric transformer in input-parallel and output-parallel connection has been presented. In first, the individual thermal characteristics of radial-vibration mode PTs are investigated and the results are also the required design area of thermal parameters in parallel–parallel connection by three steps. As an objective function, relative power-loss rate was defined and used for deriving the thermal balance design criteria. The design specification of major design parameters such as thermal parameter variation $(\Delta L_{\text{eq}},\Delta R_{\text{m}})$, initial deviation of the variation $(\delta L_{\text{eqT}},\delta R_{\text{mT}})$, and initial deviation of thermal parameters $(\delta L_{\text{eq0}},\delta R_{\text{m0}})$ have been proposed as $(-0.002,-0.006)$, $(\pm 0.0001,\pm 0.0003)$, and $(\pm 0.0002,\pm 0.0004)$ respectively, and the analysis has been verified by the simulation results.
2007-10-30