Power electronics convert and control the electrical energy we use every day, and their advancement is critical to renewable energy, electric transportation, manufacturing, consumer electronics, computing, healthcare, and more. Next-generation technologies demand power electronics with ever-increasing efficiency and performance with ever-decreasing size and cost, but advancement along these dimensions is majorly bottlenecked by the passive components (i.e., energy storage elements) integral to their operation. This work will elucidate how an alternative passive component technology – isolated piezoelectric transformers – could enable major advances in the miniaturization and performance of power electronics. Piezoelectric components offer very high theoretical efficiencies and energy densities with favorable scalability to small sizes, but so far these advantages have only been realized in a narrow range of power conversion applications. Isolated piezoelectric transformers are positioned to extend the advantages of piezoelectrics to a wide variety of applications that require electrical isolation, such as grid-connected power supplies and medical devices, removing their need for bulky, lossy magnetic transformers. This project will generate significantly expanded scientific knowledge of piezoelectric materials and components as power passive components, and how to best utilize them in power electronics to enable drastic miniaturization and performance improvements. Further, t