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Augmented Piezoelectric Resonators for Power Conversion

With high efficiency and power density at small scales, piezoelectric resonators (PRs) are promising alternatives to magnetic components for miniaturized power conversion. PRs have been demonstrated to be capable of high efficiency in dc-dc converters with favorable scalability to small sizes. In this work, we analytically show that augmenting PRs with mass layers for additional inertial energy storage can further reduce component size while improving efficiency. We model the effects of mass augmentation on the behavior of a PR as well as on its efficiency and power density characteristics. We further provide design guidelines for mass-augmented PRs, which we validate through simulation in COMSOL. It is estimated that for an example case, mass augmentation is capable of decreasing a PR’s minimum loss ratio by 44% and increasing its maximum volumetric power density by 130%.