Charge-pumping with finger capacitance in a custom electrostatic energy harvesting ASIC

We present an integrated circuit capable of scavenging energy from repetitive changes in finger touch capacitance. A finger tapping on this ASIC generates a capacitive change of approximately 770pF. These changes feed into a charge-pump circuit which stores 320pJ of energy on a 1nF storage capacitor...

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Bibliographic Details
Published in:arXiv.org 2020-07
Main Authors: Zhou, Alyssa Y, Maharbiz, Michel M
Format: Article
Language:English
Subjects:
Application specific integrated circuits
Capacitance
Capacitors
Charge pumps
Energy harvesting
Energy storage
Integrated circuits
Scavenging
Online Access:Get full text
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Summary:We present an integrated circuit capable of scavenging energy from repetitive changes in finger touch capacitance. A finger tapping on this ASIC generates a capacitive change of approximately 770pF. These changes feed into a charge-pump circuit which stores 320pJ of energy on a 1nF storage capacitor. We present measurement results and simulations that demonstrate operation. As a proof-of-concept, we also demonstrate that the harvested energy can power a ring oscillator which outputs a series of chirps with frequencies ranging from 80Hz to 30kHz as the storage capacitor voltage charges and discharges.
ISSN:2331-8422
DOI:10.48550/arxiv.2007.05076