Frequency‐tunable resonant hybrid vibration energy harvester using a piezoelectric cantilever with electret‐based electrostatic coupling

Hybrid vibration energy harvesting technology converts into electricity using multiple transduction mechanisms to improve output power. A frequency-tunable resonant hybrid harvester a piezoelectric cantilever with electret-based electrostatic coupling is proposed in this article. The including force and electrical damping introduced by an electret film placed below the cantilever, where acting on realises tunable frequency additional boosts power output. electromechanical model derived Euler–Bernoulli beam theory Kirchhoff's law. By investigating static dynamic stability of maximum surface potential defined prevent pull-in phenomenon. device evaluated, optimal determined obtain matching mechanical for can be adjusted range 176.1 rad/s changing resistive load. experimental was 5.2 μW, 27.4 times higher than that individual generator. exhibits promising microelectronic devices wireless sensor network node.