A Reciprocating Swing Piezoelectric‐Electromagnetic Hybrid Energy Harvester Based on Low‐Frequency Human Motion

This article came up with a reciprocating swing piezoelectric‐electromagnetic hybrid energy harvester (HEH) based on low‐frequency human motion to address the complex energy and data processing issues of wearable devices. It can enhance energy collection in low‐frequency (≤4 Hz) joint motion by accelerating the gear set. Piezoelectric energy harvester (PEH) and electromagnetic energy harvester (EMH) can work synchronously to achieve high‐performance output. Through the performance analysis of the prototype, under the optimal parameters, the output power of the HEH system is 19.84 mW and the maximum power density is 0.132 mW mm −3 . Compared with PEH and EMH, the output power has increased by 81.5% and 360%, respectively. The prototype is installed on the human knee joint for testing to confirm the feasibility of HEH. The experimental results show that HEH has a good application prospect in wireless self‐power supply and self‐sensing. It provides a new power supply solution for wearable devices in fields such as medical rehabilitation and sports monitoring.