Frequency Up-Conversion Hybrid Energy Harvester Combining Piezoelectric and Electromagnetic Transduction Mechanisms

Soonjae Pyo, Dae Sung Kwon, Hee Jin Ko, Youngkee Eun, Jongbaeg Kim

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


A hybrid energy harvester with frequency up-conversion structures is proposed. The harvester achieves a high power output by utilizing both piezoelectric and electromagnetic transduction mechanisms. The harvester comprises a flexible substrate and two (internal and external) cantilevers. The internal and external cantilevers used for piezoelectric and electromagnetic conversion, respectively, are arranged such that the piezoelectric internal cantilever can vibrate with a large displacement to produce high output power. We use a frequency up-conversion method to convert the bending of the harvester into the vibration of the structure so that the harvester can generate energy even from the mechanical motion with an extremely low frequency. Two harvester configurations are investigated to validate the effect of the relative positions of the coil and magnet on the output voltage of the harvester. The maximum power output of the hybrid harvester is 7.38 mW, with outputs of 1.35 and 6.03 mW for piezoelectric and electromagnetic conversion, respectively.

Original languageEnglish
Pages (from-to)241-251
Number of pages11
JournalInternational Journal of Precision Engineering and Manufacturing - Green Technology
Issue number1
Publication statusPublished - 2022 Jan

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIT) (Grant Nos. NRF-2018R1A2A1A05023070 and 2018R1A4A1025986) and the Research fund for a new professor by the SeoulTech(Seoul National University of Science and Technology).

Publisher Copyright:
© 2021, Korean Society for Precision Engineering.

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Management of Technology and Innovation


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