Safe Charging for Wireless Power Transfer

As battery-powered mobile devices become more popular and energy hungry, wireless power transfer technology, which allows the power to be transferred from a charger to ambient devices wirelessly, receives intensive interests. Existing schemes mainly focus on the power transfer efficiency but overloo...

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Bibliographic Details
Published in:IEEE/ACM transactions on networking 2017-12, Vol.25 (6), p.3531-3544
Main Authors: Haipeng Dai, Yunhuai Liu, Guihai Chen, Xiaobing Wu, Tian He, Liu, Alex X., Huizhen Ma
Format: Article
Language:English
Subjects:
Batteries
Charging
Computer simulation
Electromagnetic radiation
Electronic devices
Greedy algorithms
IEEE transactions
optimization
Power efficiency
Radio frequency
Safety
Sensors
Wireless communication
Wireless power transfer
Wireless power transmission
Wireless sensor networks
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Summary:As battery-powered mobile devices become more popular and energy hungry, wireless power transfer technology, which allows the power to be transferred from a charger to ambient devices wirelessly, receives intensive interests. Existing schemes mainly focus on the power transfer efficiency but overlook the health impairments caused by RF exposure. In this paper, we study the safe charging problem (SCP) of scheduling power chargers so that more energy can be received while no location in the field has electromagnetic radiation (EMR) exceeding a given threshold Rt. We show that SCP is NP-hard and propose a solution, which provably outperforms the optimal solution to SCP with a relaxed EMR threshold (1-ε)Rt. Testbed results based on 8 Powercast TX91501 chargers validate our results. Extensive simulation results show that the gap between our solution and the optimal one is only 6.7% when ε = 0.1, while a naive greedy algorithm is 34.6% below our solution.
ISSN:1063-6692
1558-2566
DOI:10.1109/TNET.2017.2750323