Abstract
On the Internet of Things (IoT) where all electronic devices are connected to the internet, a secure power supply is necessary. Energy harvesting technology is attracting attention as ”enabling technology” that expands the use and opportunities of IoT utilization. This technology harvests energy that dissipates around us, in the form of electromagnetic waves, heat, vibration, etc. and converts it into easy-to-use electric energy. Alternating current signals can be extracted from bio-mechanical pulsations using skin-attached piezoelectric elements with a protrusion, as we reported previously. However, we found that the maximum voltage of the extracted signal was unstable and low. This study demonstrates that piezoelectric elements can be stacked to stabilize and increase the maximum voltage, and that the extracted signal can be used to charge a capacitor, after rectification using a voltage-doubler rectifier circuit with Schottky barrier diodes.
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