Phase-Shift Voltage Regulation of DC-DC Converters Based on Piezoelectric Resonators

Piezoelectric Resonators (PRs) are promising alter-native passive components for power conversion, offering high power density, high efficiency, and the opportunity to replace bulky inductors. Previous research has demonstrated their uti-lization, performance, and benefits in power conversion, but straightforward approaches for the closed-loop control of such designs are limited. In this paper, we propose a simplified closed-loop control strategy for PR-based dc-dc converters using a symmetric, eight-stage switching sequence with phase-shift-based voltage regulation. To accompany the control scheme, we likewise derive a dynamic model for controlling the output voltage, which we validate in Matlab-Simulink. We further validate the proposed control scheme in an experimental prototype, for which we present the start-up transient and output voltage responses.