16.2 A Bias-Flip-Based Piezoelectric Energy Harvesting Interface with a Digital Track-and-Lock MPPT Achieving Sampling-Free Operation and 99.8% MPPT Efficiency
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%.
Fields of Study & Subjects
Innovative Energy Harvesting Technologies
Advanced DC-DC Converters
Advanced Sensor and Energy Harvesting Materials
Publication details
- Journal / source
- Digest of technical papers/Digest of technical papers - IEEE International Solid-State Circuits Conference
- Pages
- 278–280
- Publication date
- 15 February 2026
- Language
- EN