An efficient self-powered piezoelectric energy extraction scheme with cascaded-gyrators-based transformer

The enhancement of power transfer from the piezoelectric transducer to the load with a compact size is explored in this paper. Large physical inductors are no more required to create resonance in piezoelectric energy harvesting schemes while applying the proposed gyrator-induced double resonance (GI-DR) technique. Hence, the proposed circuit is cost-effective and provide improved performance along with reduced-space benefits in integrated circuits (IC) package for wireless sensor nodes (WSN) and Internet-of-Things (IoT) applications. Two cascaded gyrators are used in place of a transformer in the proposed circuit. The required phasor response for resonance is acquired by the gyrators' voltage-current (V–I) relationship. Regarding the final charging voltage, the proposed circuit with a storage capacitor of 1000 mF can obtain 763.46 % and 14.77 % improved performance than other synchronous circuits like SEH and DSSH respectively. The proposed technique can also be applied to similar piezoelectric energy harvesting strategies with large inductors to create resonance.