Piezoelectric components are promising alternative passive components for power conversion, but their highest efficiencies are limited to a narrow load range. In this work, we propose a converter topology capable of reconfiguring a single piezoelectric resonator (PR) between different vibration modes to achieve high efficiency across a wide load range. We experimentally validate this topology using a 2nd-overtone radial-mode piezoelectric resonator to achieve a load range of 7.2-100% with a power stage efficiency of greater than 95% and a peak efficiency of 99.2%. The proposed reconfiguration strategy extends the opportunity of PR-based power conversion to applications requiring high performance across wide load ranges.
