Abstract:A piezoelectric energy harvester (PEH) for converting the kinetic energy of human body based on the piezoelectric effect was proposed,and the power generating capacity of the device was studied theoretically and experimentally.The results showed that the output energy of the PEH increased with increasing excitation force in a certain range of deformation. When the excitation frequency and the PEH structure size was determined,the output power of the PEH changed along with the load of different resistance value,and there was an optimal load to obtain maximal electrical energy.The maximum output power was the function of voltage and capacitance in open circuit of PEH,The maximum output power was unrelated with the external filter capacitor.The maximum output power of the PEH was 0.31 mW at excited frequency of 2 Hz (the walking frequency).