15 April 2016 Energy harvesting performance of a broadband electromagnetic vibration energy harvester for powering industrial wireless sensor networks
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Abstract
To supply power to wireless sensor networks, a type of broadband electromagnetic vibration energy harvester (VEH) using bistable vibration scavenging structure is proposed. It consists of a planar spring, an electromagnetic transducer with an annular magnetic circuit, and a coil assembly with a ferrite bobbin inside. A nonlinear magnetic force respecting to the relative displacement is generated by the ferrite bobbin, and to broaden the working frequency bandwidth of the VEH. Moreover, the ferrite bobbin increases the magnetic flux linkage gradient of the coil assembly in its moving region, and further to improve its output voltage. The dynamic behaviors of the VEH are analyzed and predicted by finite element analysis and ODE calculation. Validation experiments are carried out and show that the VEH can harvest high energy in a relatively wide excitation frequency band. The further test shows that the load power of the VEH with a load resistor of 90Ω can reach 10mW level in a wide frequency bandwidth when the acceleration level of the harmonic excitation is 1g. It can ensure the intermittent work of many sensors as well as wireless communication modules at least.
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Long Ren, Renwen Chen, Huakang Xia, Xiaoxiao Zhang, "Energy harvesting performance of a broadband electromagnetic vibration energy harvester for powering industrial wireless sensor networks", Proc. SPIE 9799, Active and Passive Smart Structures and Integrated Systems 2016, 97993P (15 April 2016); doi: 10.1117/12.2218736; https://doi.org/10.1117/12.2218736
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