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Article

A Self-Adaptive and Self-Sufficient Energy Harvesting System

1
Chair of Measurement and Control Systems, Center of Energy Technology (ZET), Universität Bayreuth, Universitätsstraße 30, D-95447 Bayreuth, Germany
2
Hahn-Schickard, Wilhelm-Schickard-Str.10, D-78052 Villingen-Schwenningen, Germany
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(9), 2519; https://doi.org/10.3390/s20092519
Received: 18 March 2020 / Revised: 15 April 2020 / Accepted: 28 April 2020 / Published: 29 April 2020
(This article belongs to the Special Issue Sensors and Systems with Energy Harvesting)
Self-adaptive vibration energy harvesters convert the kinetic energy from vibration sources into electrical energy and continuously adapt their resonance frequency to the vibration frequency. Only when the two frequencies match can the system harvest energy efficiently. The harvesting of vibration sources with a time-variant frequency therefore requires self-adaptive vibration harvesting systems without human intervention. This work presents a self-adaptive energy harvesting system that works completely self-sufficiently. Using magnetic forces, the axial load on a bending beam is changed and thus the resonance frequency is set. The system achieves a relative tuning range of 23% at a center frequency of 36.4 Hz. Within this range, the resonance frequency of the harvester can be set continuously and precisely. With a novel optimized method for frequency measurement and with customized electronics, the system only needs 22 µW to monitor the external vibration frequency and is therefore also suitable for environments with low vibration amplitudes. The system was verified on a vibrational test bench and can easily be tailored to a specific vibration source. View Full-Text
Keywords: vibration energy harvesting; self-adaptive; self-sufficient; electromagnetic; frequency measurement; microgenerator vibration energy harvesting; self-adaptive; self-sufficient; electromagnetic; frequency measurement; microgenerator
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MDPI and ACS Style

Mösch, M.; Fischerauer, G.; Hoffmann, D. A Self-Adaptive and Self-Sufficient Energy Harvesting System. Sensors 2020, 20, 2519. https://doi.org/10.3390/s20092519

AMA Style

Mösch M, Fischerauer G, Hoffmann D. A Self-Adaptive and Self-Sufficient Energy Harvesting System. Sensors. 2020; 20(9):2519. https://doi.org/10.3390/s20092519

Chicago/Turabian Style

Mösch, Mario, Gerhard Fischerauer, and Daniel Hoffmann. 2020. "A Self-Adaptive and Self-Sufficient Energy Harvesting System" Sensors 20, no. 9: 2519. https://doi.org/10.3390/s20092519

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