A Piezoelectric Energy Harvester for Wearable Applications
Mechanical energy can be captured and converted into electric energy directly through piezoelectric energy harvester, which meet the need of portable power supply for wearable electronics. Due to the large amount of power generation from walking or running in daily life, putting the harvester into shoes is a common research method. An efficient energy harvester made of polyvinylidene difluoride (PVDF) film with a zigzag structure is proposed and demonstrated for general human motion in this paper. The designed zigzag structure is a PVDF film layer sandwiched by two stainless steel layers. Two experiments were conducted to study the output voltages generated by the 500 N impulse force under 1 Hz and the human walking varies different speeds. The peak power generated by the impulse force and human walking are all at the μW level. The human test result shows that the peak-peak voltage increases with the increase of the walking speed.
KeywordsWearable Piezoelectric Energy harvester
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