An electromagnetic micro power generator for wideband environmental vibrations

This paper presents a wideband electromagnetic vibration-to-electrical micro power generator. The micro generator is capable of generating steady power over a predetermined frequency range. Power is generated by means of the relative motion between a magnet and coils fabricated over resonating cantilevers through electromagnetic induction. The reported generator covers a wide band of external vibration frequency by implementing a number of serially connected cantilevers in different lengths resulting in an array of cantilevers with varying natural frequencies. The device generates 0.4 μW of continuous power with 10 mV voltage in an external vibration frequency range of 4.2–5 kHz, covering a band of 800 Hz.