Improvement of Efficiency of Power Management Circuit for Micro Magnetostrictive Vibrational Power Generator

Abstract

We investigate magnetostrictive vibration power generator using iron gallium alloy for battery-free wireless module. This generator harvest energy efficiently, but there is problem that huge energy loss occurs in power inverter circuit. This energy loss is especially large in the case of micro power generator. In this paper, we optimized power inverter circuit and reduced this energy loss. Then, we made battery-free wireless module for practical use with optimized power inverter circuit. Finally, we succeeded to transmit temperature signal in every 72 seconds from vibration of 1.5 G and 657 Hz, in every 9 seconds from vibration of 5 G and 657 Hz.