A high-efficiency charger with adaptive input ripple MPPT for low-power thermoelectric energy harvesting achieving 21% efficiency improvement

Junwon Jeong, Minseob Shim, Junyoung Maeng, Inho Park, Chulwoo Kim

Research output: Contribution to journalArticle


A high-efficiency charger for low-power thermoelectric energy harvesting with a method for improving the efficiency, which is called the adaptive input ripple (AIR) maximum power point tracking (MPPT) technique, is introduced in this paper. On the basis of the key finding that the end-to-end efficiency (ηE-E) is highly dependent on the amplitude of the input ripple of the charger (ΔVIN) in the low-power region, the proposed AIR MPPT technique adjusts ΔVIN to maximize ηE-E. Moreover, the minimum input power that allows the charger to maintain operation is enhanced by the proposed AIR MPPT technique. The proposed charger is implemented with 180-nm complementary metal oxide-semiconductor technology. An improvement of 21% in ηE-E is achieved with the proposed technique. Furthermore, the proposed technique enhances the minimum power by 7.5 μW. The startup power and minimum power of the prototype are 37 and 6 μW, respectively. The maximum ηE-E is 82%.

Original languageEnglish
Article number8693878
Pages (from-to)347-358
Number of pages12
JournalIEEE Transactions on Power Electronics
Issue number1
Publication statusPublished - 2020 Jan



  • Adaptive input ripple (AIR)
  • charger
  • energy harvesting
  • low power
  • maximum power point tracking (MPPT)
  • thermoelectric generator (TEG)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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