Switched-capacitor-convertors based on fractal design for output power management of triboelectric nanogenerator

Wenlin Liu, Zhao Wang, Gao Wang, Qixuan Zeng, Wencong He, Liyu Liu, Xue Wang, Yi Xi, Hengyu Guo (), Chenguo Hu () and Zhong Lin Wang ()
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Wenlin Liu: Chongqing University
Zhao Wang: Chongqing University
Gao Wang: Chongqing University
Qixuan Zeng: Chongqing University
Wencong He: Chongqing University
Liyu Liu: Chongqing University
Xue Wang: Chongqing University
Yi Xi: Chongqing University
Hengyu Guo: Chongqing University
Chenguo Hu: Chongqing University
Zhong Lin Wang: Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Owing to the advantages of integration and being magnet-free and light-weight, the switched-capacitor-convertor plays an increasing role compared to traditional transformer in some specific power supply systems. However, the high output impedance and switching loss largely reduces its power efficiency, due to imperfect topology and transistors. Herein, we propose a fractal-design based switched-capacitor-convertors with characteristics including high conversion efficiency, minimum output impedance, and electrostatic voltage applicability. As a double-function output power management system for triboelectric nanogenerators, it delivers over 67 times charge boosting and 954 W m−2 power density in pulse mode, and achieves over 94% total energy transfer efficiency in constant mode. The establishment of the fractal-design switched-capacitor-convertors provides significant guidance for the development of power management toward multi-functional output for numerous applications. The successful demonstration in triboelectric nanogenerators also declares its great potential in electric vehicles, DC micro-grids etc.

Date: 2020
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DOI: 10.1038/s41467-020-15373-y

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