Asymmetric SECE Piezoelectric Energy Harvester under Weak Excitation

Seong Jin Yun, Seung Soo Kwak, Jiseong Lee, Yun Chan Im, Sang Goo Lee, Yong Sin Kim

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


Piezoelectric energy harvesters (PEHs) are widely used to convert energy from a piezoelectric transducer into a stable DC form, which enables low-power IoT devices to have an unlimited operating life without using batteries. Under weak excitation conditions, however, the power-extraction efficiency of conventional PEHs is too low to provide power even to low-power IoT devices that requires low operation voltages less than 2 V. This paper proposes an asymmetric synchronous electric charge extraction (ASECE) scheme that improves the extraction efficiency of PEHs at low output voltages under weak excitation. The proposed ASECE is implemented using 0.18~\mu \text{m} CMOS technology. The figure-of-merits (FOMs) of the proposed ASECE while operating under 2 V of output voltage are 7.14 and 6.24 at weak and strong excitations, respectively. The maximum FOM for various different excitation levels is observed to be as high as 7.7. The proposed ASECE is superior to prior art with respect to FOM, by at least 1.15\times , 1.63\times , and 2.21\times under 2 V, 1 V, and 0.5 V outputs, respectively, under strong excitation.

Original languageEnglish
Article number9099539
Pages (from-to)99132-99140
Number of pages9
JournalIEEE Access
Publication statusPublished - 2020


  • Energy harvesting
  • Low power electronics
  • Piezoelectric devices
  • The~Internet of Things

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)


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