Power management system of a MEMS vibrational energy harvesting sensor node under low vibration conditions

This paper presents a power management system of self-supplied wireless sensor node based on MEMS electret vibrational energy harvester. The storage and control policy of the management circuit is optimized for small ambient excitation conditions to reduce power dissipation and avoid failure in wireless data transmissions. Live acceleration data collected from a bridge as well as simulation results were used to confirm the feasibility of the proposed circuit operating in real case low vibration environment.