Piezoelectric Energy Harvesting Interface Using Self-Bias-Flip Rectifier and Switched-PEH DC–DC for MPPT

Zhen Li, Jing Wang, Man Kay Law, Sijun Du, Junrui Liang, Xu Cheng, Jun Han, Xiaoyang Zeng, Zhiyuan Chen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review


This article proposes a novel eight-phase self-bias-flip piezoelectric energy harvesting interface with charge recycling and reusing (SBFRR) and a switched-piezoelectric energy harvester (PEH) dc–dc (SPDC) converter. The proposed scheme innovatively utilizes the inherent capacitors ( CP ) of four PEHs as energy sources, flying capacitors, and flipping capacitors for time-sharing reuse to achieve both a high-voltage flipping and dc–dc conversion efficiency, while avoiding the use of extra energy reservoirs. The design is fully integrated and fabricated in standard 0.18- μ m CMOS. Measurement result demonstrates that the voltage flipping efficiency of up to 80% is achieved. Compared with the ideal full-bridge rectifier (FBR), the measured maximum output power improving rate (MOPIR) can be increased to 4.88 × . In addition, with the four CP serving as flying capacitors to achieve SPDC conversion for maximum power point track (MPPT), an MOPIR of > 3.5 × can be maintained with a PEH input voltage from 0.78 to 4.9 V.

Original languageEnglish
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Publication statusAccepted/In press - 2023


  • Energy harvesting
  • flipping efficiency
  • fully integrated
  • maximum output power improving rate (MOPIR)
  • maximum power point track (MPPT)
  • multi-input
  • piezoelectric
  • self-bias-flip
  • switched-piezoelectric energy harvester (PEH) dc–dc (SPDC)


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