Abstract

A novel energy harvesting technique for piezoelectric transducers (PZTs) is proposed to enable energy harvesting from irregular high voltage inputs. With the proposed partial electrical charge extraction (PECE) scheme, a small portion of the charges generated by the PZT is repeatedly transferred to the battery until the input excitation is finished. With PECE, the PZT output voltage is automatically regulated at the maximum voltage level allowed by technology (V MAX ) while maximizing energy extraction from the PZT. This allows energy harvesting from irregular PZT excitations that can generate open circuit voltage (V OC ) higher than V MAX . The measurement results with a test chip fabricated in 350nm process show that the proposed harvester successfully harvests energy from the excitation with V OC of up to 60V, higher than V MAX of 30V, with up to $3.9\times$ improvement compared with a conventional full bridge rectifier (FBR).

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