A 70-to-2 v Triboelectric Energy Harvesting System Utilizing Parallel-SSHI Rectifier and DC-DC Converters

Kara I., Becermis M., Kamar M. A., Aktan M., Dogan H., Mutlu S.

IEEE Transactions on Circuits and Systems I: Regular Papers, vol.68, no.1, pp.210-223, 2021 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 68 Issue: 1
  • Publication Date: 2021
  • Doi Number: 10.1109/tcsi.2020.3025468
  • Journal Name: IEEE Transactions on Circuits and Systems I: Regular Papers
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Business Source Elite, Business Source Premier, Communication Abstracts, Compendex, Computer & Applied Sciences, INSPEC, Metadex, zbMATH, Civil Engineering Abstracts
  • Page Numbers: pp.210-223
  • Keywords: Harvester, high-voltage, TENG, triboelectrification, energy harvesting, SSHI, rectifier, buck converter
  • Istanbul Medipol University Affiliated: Yes


In this article, first integrated circuit (IC) implementation of parallel synchronized switching harvesting on inductor (p-SSHI) is presented for triboelectric energy harvester targeting 1 Hz to 5 Hz mechanical motions. It is accompanied by on-chip buck and switched capacitor DC-DC converters, all capable of handling 70 V levels. Unlike piezoelectric harvesters, triboelectric nanogenerators (TENGs) can produce very high open-circuit voltages; thus, the proposed system utilizes this property within the technology limits to maximize the extracted power. An in-house manufactured TENG using steel and polytetrafluoroethylene (PTFE) is modeled for sub-5 Hz motions. The energy is extracted and stored in an external capacitance until its voltage reaches 70 V, which is achieved in three press-and-release mechanical cycles. 70-to-2 V down conversion is carried on by 70-to-10 V buck converter followed by a 10-to-2 V switched capacitor DC-DC converter. A chip is manufactured in 0.18~mu text{m} HV BCD process with an active area of 6.25 mm2. End-to-end peak efficiency is measured as 32.71% for 1 Hz motion with a 722 mu text{W} total power delivery to the load for 4 ms.