A Bias-Flip-Based Piezoelectric Energy Harvesting Interface with a Digital Track-and-Lock MPPT Achieving Sampling-Free Operation and 99.8% MPPT Efficiency

📋 论文概要

本文提出一种用于偏置翻转压电能量采集器的全数字MPPT技术，通过Track-and-Lock机制在识别最大功率点后锁定参数，即使振动幅度或频率变化甚至消失，也能直接工作在预存状态，无需重复跟踪，确保连续最大功率输出。通过复用零电流检测器实现MPPT，无需专用采样操作，MPPT电路静态电流仅17nA，峰值效率达99.8%。

💡 主要创新点

• 提出数字Track-and-Lock MPPT，锁定MPP参数避免重复跟踪，适应振动变化并保证连续最大输出。
• 复用零电流检测器实现采样免费的MPPT，无需额外采样电路，降低功耗。

🏷 关键词

📄 原文摘要

Abstract A fully digital MPPT is proposed for a bias-flip piezoelectric energy harvester. Once the MPP is identified, its parameters are stored and locked. Even if the vibration amplitude or frequency changes or disappears entirely, it directly operates at the pre-recorded MPP state. There is no need for repeated tracking, thus ensuring continuous maximum power output. By reusing the zero-current detector used for switching control, no dedicated sampling operation is required for MPPT. The measured IQ of the MPPT circuit is 17nA, and the peak MPPT efficiency is 99.8%. Piezoelectric energy harvesters (PEHs) are perceived as a vital battery-substituted powersupply solution for self-sustainable wireless sensor nodes (WSNs) [1]. A rectifier is required to extract energy from the vibrating piezoelectric transducer (PT), where the vibration amplitude and frequency are not fixed as the ambient environment changes during

👥 作者与机构

Rui Zhang1, Chuhui Wang2, Zhongxin Ye1, Ka Nang Leung2, Jianping Guo1

Sun Yat-Sen University, Guangzhou, China, 2Chinese University of Hong Kong, Hong Kong, China