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This paper proposes a novel vibration energy harvesting strategy based on anextension of the Synchronous Electric Charge Extraction (SECE) approach,enabling both the maximization of the harvested power and a consequentbandwidth enlargement in the case of highly coupled/lightly dampedpiezoelectric energy harvesters. The proposed strategy relies on the tuning ofthe frequency of the energy extraction events, which is either N times greaterthan the vibration frequency (Multiple SECE case, N > 1) or 1/N times smaller(Regenerative SECE, N < 1). We first prove analytically than increasing ordecreasing N both lead to a damping reduction. While N has no impact on thesystem's resonance frequency in the Regenerative case (N < 1), we show thatthis resonant frequency becomes a function of N in the Multiple SECE case (N >1). Experimental results on a highly coupled/lowly damped piezoelectricharvester (k^2= 0.44, Q_m = 20) demonstrates the potential of this strategy,leading to 257% harvested power improvement compared to SECE (N = 1). and thepossibility to tune the resonant frequency on a range as large as 35% of theshort-circuit resonant frequency of the harvester.

A unified N-SECE strategy for highly coupled piezoelectric energy scavengers