Research press release





今回、Shanhui Fanたちの研究グループは、こうした電源との距離が変化しても高い給電効率を実現するワイヤレス給電系を作り出した。Fanたちは、量子物理学の概念であるパリティ-時間対称性の原理を用いて電気回路を作製し、電源との距離が約1メートルの範囲内で変化しても一定の給電効率を確保できることを実証した。また、FanたちはLED電球を電源から遠ざける実験を行い、電源との距離が約1メートルに達するまでLED電球に電気を流し続けることができ、一定の輝度が得られることも実証した。


A wireless power transfer system that can charge an LED bulb even as the bulb moves away from the power source is reported in this week’s Nature.

Developments in wireless power transfer have paved the way for applications such as the powering of implantable medical devices and the wireless charging of stationary electric vehicles. However, it has been challenging to create a robust system that maintains efficient transfer of power as the operating conditions - such as the distance between the source and the wirelessly powered device - vary.

Shanhui Fan and colleagues created a wireless power transfer system that can achieve high-efficiency power transfer over varying distances. Using the principle of parity-time symmetry - a concept from quantum mechanics - the authors produced electrical circuitry and were able to demonstrate power transfer efficiency that remains constant over a distance variation of approximately one metre. In experiments involving an LED bulb, the authors demonstrated that the bulb could be powered, producing a constant brightness, as it was moved away from the power source until it reached a separation distance of around one metre.

The authors suggest that their findings could have applications in delivering power to moving devices or vehicles, where the transfer distance and orientation can change continuously.

doi: 10.1038/nature22404

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