A Packaging Scheme Enabling Resonant Frequency Tuning and Magnetic Shielding for Electromagnetic Vibration Energy Harvesters Toward Industrial Applications

In this work, a packaging scheme for electromagnetic vibration energy harvester (EVEH) is designed and implemented, to achieve resonant frequency tuning and magnetic shielding simultaneously. The proposed packaging scheme is realized by the combination of a soft magnetic tuning component and housing. A proof-of-concept EVEH prototype is fabricated to verify the proposed functionality, capable of realizing targeted frequency tuning and shielding magnetic field. The fabricated energy harvester prototype achieves a tuning range of 112–192 Hz (71.4%). Compared to the traditional frequency-tuning method based on permanent magnets, the proposed approach realizes a quasi-linear, accurate, and targeted tuning process with an optimal tuning range. In addition, the proposed packaging scheme also shields the magnetic interference between the energy harvester and the external environment, which is crucial for its application in industrial scenarios.