Self-Powered Single-Inductor Rectifier-Less SSHI Array Interface with the MPPT Technique for Piezoelectric Energy Harvesting

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Number of pages10
Journal / PublicationIEEE Transactions on Industrial Electronics
Online published6 Jan 2022
Publication statusOnline published - 6 Jan 2022


Piezoelectric energy harvester (PEH) arrays are practical solutions to the low and unreliable power output of a single PEH. However, most PEH circuits are developed for addressing the one-channel AC input from a single PEH. In this paper, an extensible ReL-SSHI (rectifier-less synchronized switch harvesting on inductor) array interface with the MPPT function to manage the multiple AC inputs from the PEH arrays is designed. The AC-DC conversion is performed by the ReL-SSHI topology with passive peak switches featured with self-powered characteristic and fast cold-start. Only one shared inductor is employed, greatly reducing the circuit volume and cost. The MPPT module for each channel is implemented by a simple envelope detector and an ultra-low power hysteresis controller and achieves continuous energy extraction by adapting the fractional normal-operation voltage (FNOV) method. A developed discrete array interface able to handle three PEHs effectively executes the MPPT for each channel with the uphill and downhill response speeds of 2.0 V/s and 7.1 V/s, and a maximal MPPT efficiency of 97.1%. This circuit boosts the power output by 485% compared with that by the traditional full-bridge rectifier, around 33% higher than that from existing SECE (synchronous electric charge extraction) array interfaces.

Research Area(s)

  • Array, energy harvester, Energy harvesting, Inductors, MPPT, piezoelectric, Power generation, SECE, SSHI, Switches, Switching circuits, Topology, Voltage

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