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%.
Bibliographical noteFunding Information:
Manuscript received November 14, 2018; revised February 19, 2019; accepted April 4, 2019. Date of publication April 17, 2019; date of current version October 18, 2019. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) 2016RIEIAIA02922127. Recommended for publication by Associate Editor C. Fernandez (Corresponding author: Chulwoo Kim.) The authors are with the Department of Electrical Engineering, Korea University, Seoul 02841, South Korea (e-mail: email@example.com; sms@kilby. korea.ac.kr; firstname.lastname@example.org; email@example.com; firstname.lastname@example.org. ac.kr).
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- Adaptive input ripple (AIR)
- energy harvesting
- low power
- maximum power point tracking (MPPT)
- thermoelectric generator (TEG)
ASJC Scopus subject areas
- Electrical and Electronic Engineering