부산대학교 도서관

This brief presents the design and architecture of a miniaturized hybrid energy harvesting system involving Piezoelectric (PEG) and Triboelectric (TEG) generators for scavenging biomechanical energy from various body movements. A combination of PEG and TEG is integrated within a single-substrate device topology that offers the prime advantages of high-output, low-cost, flexible, and compact device design. A novel circuit architecture involving active rectifiers and switched capacitors is proposed to combine these generators’ outputs. The interface and power management circuit (PMC) is designed using 180nm CMOS process. The device simulations and circuit analysis for the proposed hybrid harvesting system indicate an enhanced electrical output compared to standalone harvesters. The simulation results are backed by rigorous experimental investigations on a system prototype consisting of a low-cost TEG device assembled using off-the-shelf materials and a PMC realized using discrete components on a printed circuit board (PCB). The hybrid output of the system charges a 1 $\mu F$ load capacitor to 3.1 $V$ in 20 $s$ . The proposed system generates a peak output power of 2.76 $\mu W$ across a 20M $\Omega $ resistive load under a mechanical pressure of 50kPa at 5 Hz frequency, which demonstrates its suitability to harness energy from any biomechanical activity to power a diverse range of wearable devices.