Design of A Battery‐Free Energy Harvesting System Operating in Intermittent Mode With 60.85% Peak End‐to‐End Efficiency

ABSTRACT This paper presents the design of a battery‐free energy harvesting system that operates in intermittent mode (i.e., burst mode). This paper aims at keeping the step‐up converter and load together in idle state without consuming any power during a large fraction of time in order to store energy at the supercapacitor. Once accumulated enough energy, the converter and load receive energy in a small time duration. The system deploys a feedback circuit to prevent energy waste by keeping the output voltage in the acceptable range of 3.3–4.2 V. Implemented with discrete components, the measurement result demonstrates that the system achieves a load dynamic range of 20,000 (i.e., 1 W to 20 mW) with a peak end‐to‐end efficiency of 60.85%. By means of the feedback circuit, the system improves the efficiency by up to 35.5%.