Fully-Integrated Inductor-less Flipping-Capacitor Rectifier (FCR) for Piezoelectric Energy Harvesting

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	Fully-Integrated Inductor-less Flipping-Capacitor Rectifier (FCR) for Piezoelectric Energy Harvesting
	Chen, Z.; Law, M. K.; Mak, P. I.; Ki, W. H.; Martins, R. P.
	2017-10-01
Source Publication	IEEE Journal of Solid-State Circuits
ISSN	0018-9200
Pages	3168-3180
Abstract	This paper presents a fully integrated piezoelectric energy harvesting interface without external components. Instead of relying on bulky external inductors with high quality factor as in the conventional parallel-synchronized-switch harvesting-on-inductor (P-SSHI) approach, we propose a flipping-capacitor rectifier (FCR) topology to achieve voltage inversion of the piezoelectric energy harvester through a reconfigurable capacitor array. This fundamentally preserves a fully integrated solution without inductors while achieving a high-energy extraction capability. Measurement results from FCR1 using discrete components shows an output power enhancement of up to 3.4×, which is close to the theoretical prediction. We also fabricated a sevenphase FCR3 with four MIM capacitors and 21 switches using a 0.18-μm 1.8/3.3/6 V CMOS process, occupying an active area of ~1.7 mm2. Additionally, we implemented an active rectifier based on a common-gate comparator with phase alignment to ensure high-speed operation while minimizing the diode voltage drop. A phase generate-and-combine circuit eliminates redundant switching activities. Systematic optimization of the three main energy loss mechanisms during the finite flip time: 1) phase offset; 2) incomplete charge transfer; and 3) reduced conduction time, is also introduced. Measurement results show that the output power enhancement can reach up to 4.83× at an excitation frequency of 110 kHz.
Keyword	CMOS Deep-Tissue Implant Flippling-Capacitor Rectifier (FCR) Fully Integrated High Efficiency Inductor-less Parallel-Synchronized-Switch Harvesting-On-Inductor (P-SSHI) Piezoelectric Energy Harvesting Reconfigurable Capacitor Array Ultrasound
URL	View the original
Language	英語English
The Source to Article	PB_Publication
PUB ID	36215
Document Type	Journal article
Collection	DEPARTMENT OF PHILOSOPHY AND RELIGIOUS STUDIES
Corresponding Author	Law, M. K.
Recommended Citation GB/T 7714	Chen, Z.,Law, M. K.,Mak, P. I.,et al. Fully-Integrated Inductor-less Flipping-Capacitor Rectifier (FCR) for Piezoelectric Energy Harvesting[J]. IEEE Journal of Solid-State Circuits, 2017, 3168-3180.
APA	Chen, Z.., Law, M. K.., Mak, P. I.., Ki, W. H.., & Martins, R. P. (2017). Fully-Integrated Inductor-less Flipping-Capacitor Rectifier (FCR) for Piezoelectric Energy Harvesting. IEEE Journal of Solid-State Circuits, 3168-3180.
MLA	Chen, Z.,et al."Fully-Integrated Inductor-less Flipping-Capacitor Rectifier (FCR) for Piezoelectric Energy Harvesting".IEEE Journal of Solid-State Circuits (2017):3168-3180.

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