DESIGN OF MICROSCALE PIEZOELECTRIC ENERGY HARVESTING SYSTEM

Abstract

Using the energy harvested from the piezoelectric transducer to power on the electronic circuits in biomedical applications. The energy harvested is rectified by using the AC/DC converter with power efficiency 83% and the voltage conversion ratio reaches 300%. The DC/DC converter is used to match the output voltage of the AC/DC converter with the voltage of super capacitor 1.8V. The desired switching frequency range from 57KHz to 132KHz is generated using the voltage control oscillator that used a lookup table to guarantee that the frequency generated corresponding to the maximum power point. The output voltage of the AC/DC is digitalized to N-bits by using the successive approximation register analog to digital converter to build the lookup table.