A Nail-size Piezoelectric Energy Harvesting System Integrating a MEMS Transducer and a CMOS SSHI Circuit

Sijun Du, Yu Jia, Chun Zhao, Gehan A. J. Amaratunga, Ashwin A Seshia

Research output: Contribution to journalArticlepeer-review


Piezoelectric vibration energy harvesting has drawn much interest to power distributed wireless sensor nodes for Internet of Things (IoT) applications where ambient kinetic energy is available. For certain applications, the harvesting system should be small and able to generate sufficient output power. Standard rectification topologies such as the full-bridge rectifier are typically inefficient when adapted to power conditioning from miniaturized harvesters. Therefore, active rectification circuits have been researched to improve overall power conversion efficiency, and meet both the output power and miniaturization requirements while employing a MEMS harvester. In this paper, a MEMS piezoelectric energy harvester is designed and co-integrated with an active synchronized switch harvesting on inductor (SSHI) rectification circuit designed in a CMOS process to achieve high output power for system miniaturization. The system is fully integrated on a nail-size board, which is ready to provide a stable DC power for low-power mini sensors. A MEMS energy harvester of 0.005 cm 3 size, co-integrated with the CMOS conditioning circuit, outputs a peak rectified DC power of 40.6 \mu \text{W} and achieves a record DC power density of 8.12 mW/cm 3 when compared to state-of-the-art harvesters.

Original languageEnglish
Article number8835123
Pages (from-to)277 - 285
Number of pages9
JournalIEEE Sensors Journal
Issue number1
Early online date12 Sept 2019
Publication statusPublished - 1 Jan 2020

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  • Energy harvesting
  • Internet of Things (IoT)
  • MEMS
  • SSHI
  • energy conversion
  • integrated circuits
  • piezoelectric transducer
  • power conditioning
  • rectification
  • renewable energy
  • system miniaturization
  • wireless sensor networks (WSN)


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