A Piezoelectric Energy-Harvesting Interface Using Split-Phase Flipping-Capacitor Rectifier and Capacitor Reuse Multiple-VCR SC DC-DC Achieving 9.3× Energy-Extraction Improvement

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	A Piezoelectric Energy-Harvesting Interface Using Split-Phase Flipping-Capacitor Rectifier and Capacitor Reuse Multiple-VCR SC DC-DC Achieving 9.3× Energy-Extraction Improvement
	Chen, Z.; Jiang, Y.; Law, M. K.; Mak, P. I.; Zeng, X.; Martins, R. P.
	2019-02-01
Source Publication	IEEE International Solid-State Circuits Conference (ISSCC)
Abstract	Piezoelectric energy harvesters (PEH) exhibit promising features to scavenge the ambient vibration energy for ubiquitous miniaturized internet of things (IoT) devices. For the traditional PEH using a full-bridge rectifier (FBR), the inherent capacitance (C P ) limits the extractable AC-DC electrical power. By extending the damping duration, PEH interfaces employing non-linear techniques, such as the parallel-synchronized-switch harvesting-on-inductor (P-SSHI) [1], can increase the harvestable energy. However, they typically require bulky external high-Q inductors to enhance the extracted power. Recently, various inductor-less PEH interfaces exploiting only capacitors for flipping the PEH voltage during the zero-crossing of the PEH current (I P ) have been reported [2-4]. However, their achievable energy extraction improvement depends highly on the number of flipping phases. This work proposes a split-phase flipping-capacitor rectifier (SPFCR) implementation entailing only 4 capacitors, while achieving the highest number of phases (21) when compared to prior art [2-4]. To resolve the lack of input power (P in ) adaptability in [2-4], this work proposes a capacitor-reuse multiple voltage-conversion-ratio (VCR) switched-capacitor (SC) DC-DC converter to reduce the charge redistribution loss. Maximum power point tracking (MPPT) is also accomplished using the fractional FBR open circuit voltage (V OC,FBR ) for relaxed voltage tolerance, while raising the PEH extracted energy. This work demonstrates a measured 9.3× energy-extraction improvement when compared to a conventional FBR interface.
Keyword	Piezoelectric Energy-Harvesting Interface Split-Phase Flipping-Capacitor Rectifier (SPFCR) Capacitor Reuse Multiple-VCR SC DC-DC Converter
URL	View the original
Language	英語English
The Source to Article	PB_Publication
PUB ID	44805
Document Type	Conference paper
Collection	University of Macau
Corresponding Author	Law, M. K.
Recommended Citation GB/T 7714	Chen, Z.,Jiang, Y.,Law, M. K.,et al. A Piezoelectric Energy-Harvesting Interface Using Split-Phase Flipping-Capacitor Rectifier and Capacitor Reuse Multiple-VCR SC DC-DC Achieving 9.3× Energy-Extraction Improvement[C], 2019.
APA	Chen, Z.., Jiang, Y.., Law, M. K.., Mak, P. I.., Zeng, X.., & Martins, R. P. (2019). A Piezoelectric Energy-Harvesting Interface Using Split-Phase Flipping-Capacitor Rectifier and Capacitor Reuse Multiple-VCR SC DC-DC Achieving 9.3× Energy-Extraction Improvement. IEEE International Solid-State Circuits Conference (ISSCC).

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