Operation of battery-less and wireless sensor using magnetic resonance based wireless power transfer through concrete
Ji-Min Kim,Minseok Han,Hyung Jin Lim,Suyoung Yang,Hoon Sohn
Abstract
Although the deployment of wireless sensors for structural sensing and monitoring is becoming popular, supplying power to these sensors remains as a daunting task. To address this issue, there have been large volume of ongoing energy harvesting studies that aimed to find a way to scavenge energy from surrounding ambient energy sources such as vibration, light and heat. In this study, a magnetic resonance based wireless power transfer (MR-WPT) system is proposed so that sensors inside a concrete structure can be wirelessly powered by an external power source. MR-WPT system offers need-based active power transfer using an external power source, and allows wireless power transfer through 300-mm thick reinforced concrete with 21.34% and 17.29% transfer efficiency at distances of 450 mm and 500 mm, respectively. Because enough power to operate a typical wireless sensor can be instantaneously transferred using the proposed MR-WPT system, no additional energy storage devices such as rechargeable batteries or supercapacitors are required inside the wireless sensor, extending the expected life-span of the sensor.
Key Words
wireless power transfer; wireless sensor; magnetic resonance; steel-reinforced concrete; structural health monitoring
Address
Ji-Min Kim, Hyung Jin Lim, Suyoung Yang and Hoon Sohn — Department of Civil Engineering, Korean Advanced Institute for Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
Minseok Han — Electronics Department, Osan University, 45 Cheonghak-ro, Osan, 18119, Republic of Korea
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