Closed-Loop Control of Symmetric Switching Sequences for Piezoelectric-Resonator-Based DC-DC Converters

Piezoelectric Resonators (PRs) are promising alternative passive components for power conversion, offering high power density, high efficiency, and the opportunity to replace bulky inductors. Previous research has demonstrated their utilization, performance, and benefits in power converters, but straightforward approaches for the closed-loop control of such designs are limited. In this paper, we propose a simplified feedback control strategy for PR-based dc-dc converters based on symmetric, eight-stage switching sequences. We validate the proposed control scheme in a 400 kHz experimental prototype, for which we present the start-up transient, load step responses and efficiency trajectories. The proposed control scheme demonstrates promising performance, paving the way for practical implementation of PR-based dc-dc power conversion.