An 88 Efficiency 2.4μW to 15.6μW Triboelectric Nanogenerator Energy Harvesting System Based on a Single-Comparator Control Algorithm

摘要

This paper presents an energy harvesting system (EHS) based on a triboelectric nanogenerator (TENG). A novel TENG HDL spice model was developed to optimize the proposed ultra-low power (ULP) EHS. The proposed TENG-EHS utilizes a novel single-comparator-control (SCC) algorithm for improving the power conversion efficiency (PCE). It modulates the switching frequency of the implemented switched capacitor charge pump (SCCP) in proportion to the load condition at a given applied vibration frequency (i.e. excitation frequency). Moreover, a novel hysteresis control technique was introduced. It regulates the input voltage at the maximum possible power point without IC breakdown, and adopts a dropout excess charge storage technique. The fabricated test chip in 65-nm CMOS technology achieves a peak PCF. of 88% with 2.4 μW to 15.6 μW input power and power density of 39.59 μW/mm^2.