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A High-Voltage Dual-Input Buck Converter Achieving 52.9% Maximum End-to-End Efficiency for Triboelectric Energy-Harvesting Applications

Authors
Park, InhoMaeng, JunyoungShim, MinseobJeong, JunwonKim, Chulwoo
Issue Date
May-2020
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Citation
IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.55, no.5, pp 1324 - 1336
Pages
13
Journal Title
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume
55
Number
5
Start Page
1324
End Page
1336
URI
https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/159058
DOI
10.1109/JSSC.2019.2942370
ISSN
0018-9200
1558-173X
Abstract
This article presents a high-voltage (HV) dual-input (DI) buck converter for triboelectric (TE) energy-harvesting applications with a maximum power point tracking (MPPT) for TE nanogenerators (TENGs). An important characteristic of TENGs is their ac output voltage with different positive and negative peak voltages; thus, the proposed system separately harvests each half-wave (HW) with a dual-output rectifier for better extraction efficiency. Furthermore, given the similarity between the electrical models of piezoelectric transducers and TENGs, a root-mean-square MPP analysis is proposed with a fractional open-circuit voltage (FOCV) method according to each HW from the TENGs. The HV DI buck converter regulates two HVs from the TENGs for MPPT with a single inductor. The proposed HV protector prevents the breakdown of the power transistor due to HV stress. To regulate the two input voltages of the buck converter at each MPP, a synchronous pulse-skipping modulation technique is implemented in the system. The entire system is fabricated in a 180-nm BCDMOS process with an active area of 2.482 mm(2). The maximum input voltage of the HV DI buck converter is 70 V, and the maximum end-to-end efficiency of 52.90% is achieved with human skin-based and polytetrafluoroethylene-based TENGs.
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