Omnidirectional wireless power transfer system supporting mobile devices

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2016-02, Vol.122 (2), p.1-5, Article 54
• Main Authors: Che, Bang-Jun, Meng, Fan-Yi, Lyu, Yue-Long, Zhu, Wen-Liang, Zhang, Kuang, Yang, Guo-Hui, Fu, Jia-Hui, Zhu, Lei, Wu, Qun, Sun, Li
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Design engineering; Feeding; Machines; Magnetic fields; Manufacturing; Mobile communication systems; Nanotechnology; Optical and Electronic Materials; Phase shift; Physics; Physics and Astronomy; Power transfer; Processes; Receiving; Surfaces and Interfaces; Thin Films; Transmitters
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-015-9573-6

An efficient method for the challenge design of an omnidirectional wireless power transfer system (OWPT) is proposed. The OWPT is realized utilizing the rotating magnetic field, which is generated by the proposed 2-D transmitter. The transmitter is composed by two mutually perpendicular loops fed by two excitation sources with the same magnitude and 90° phase difference. An OWPT system prototype is fabricated and measured. Experimental results demonstrate that the system can deliver power to receivers moving around the transmitter with a steady transfer efficiency. Furthermore, the magnitude distribution of the rotating magnetic field can be controlled by the feeding phase difference between the two loops. This capability enables the OWPT system to focus energy for device moving in a limited receiving angle range.