An Interface for Shock Inputs in Piezoelectric Energy Harvesting using Synchronous Electric Charge Extraction

Abstract

The design and implementation of a synchronous electric charge extraction (SECE) interface that is optimized in handling shock inputs for piezoelectric energy harvesters (PEH) is presented in this paper. The electrical efficiency of the system over time is analyzed across different amounts of shock inputs of the PEH. To improve the efficiency of the interface circuit, control signals are adjusted so that harvesting times are optimized based on the remaining energy in the shock input and on the system's power consumption. The average power consumption of the system is around 1.81µW. Overall, the interface circuit achieves at least 82.53 % harvesting efficiency by setting the count of harvesting cycles depending on the characteristics of the shock input.