Basic Analysis of Two-Coils Structure Based on Magnetically-Coupled Resonant Technology for SWIPT Application

Biyun Ma (1) , Boheng Chen (1) , Sumei Li (1) , Yide Wang (2) , Gang Wei (1)

1 School of Electronic and Information Engineering
2 IETR - Institut d'Électronique et des Technologies du numéRique

The Magnetically-coupled resonant (MCR)technology is exploited in this paper to realize Synchronouswireless information and power transfer (SWIPT) function,which means that the power carriers also transmitinformation. The circuit structure of SWIPT system is analyzedand the existence of two optimal frequencies in powerefficiency under small resistance circumstance is proved.The physical parameters having influences on the two optimalfrequencies are discussed, such as the distance betweencoils, impedance characteristics of coils and loads.These results provide a way to increase the bandwidth ofMCR technology, while maintaining high power efficiencyto realize SWIPT function. Simulations and experimentalresults are presented to verify the feasibility of the proposedsystem and obtained theoretical expressions.

Mots clés: Synchronous wireless information and power transfer (SWIPT); Wireless power transfer (WPT); Magnetically-coupled resonant (MCR); Efficiency; Equivalent circuit.

Domaines: Sciences de l'ingénieur [physics]

Biyun Ma, Boheng Chen, Sumei Li, Yide Wang, Gang Wei. Basic Analysis of Two-Coils Structure Based on Magnetically-Coupled Resonant Technology for SWIPT Application. Chinese Journal of Electronics, 2015, 24 (4), pp.852-856. ⟨10.1049/cje.2015.10.031⟩. ⟨hal-01240021⟩