A High-Efficiency and Long-Distance Power-Relay System with Equal Power Distribution

Fei Lu, Hua Zhang, Weiguo Li, Zhe Zhou, Chong Zhu, Chenwen Cheng, Zhanfeng Deng, Xi Chen, Chunting Chris Mi

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


This paper proposes a wireless power repeater system for long-distance and multiple-load applications with equal power load at each repeater. Each repeater performs as a power relay that not only receives and transmits power but also supplies power to its local load. The main contribution of this paper is to provide the design methodology of a distributed power-relay system. First, it provides the mathematical model of the power distribution among the power relays, indicating that the inductances and resistances can affect the power distribution. Second, it provides the power transfer capability of a power-relay system based on the quality factor and efficiency requirement, indicating the maximum achievable number of power relays in a system. Aiming at practical applications, this paper provides the guideline for the circuit parameter design to achieve equal power distribution. Two typical examples are proposed to realize equal power distribution. The identical \text{M}-{\text {n}} and different \text{R}-{\text {n}} examples are selected for implementation. The coil size is 400\,\,\text {mm}\times 400 mm, and the eight power relays achieve a transfer distance of 3.2 m with a total power of 760 W and an efficiency of 70%. Experimental results validate that equal power distribution is achieved for the multiple loads across a long distance. Each power relay dissipates about 95-W power in its local load with a power variation limited to ±2%.

Original languageEnglish (US)
Article number8636907
Pages (from-to)1419-1427
Number of pages9
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Issue number2
StatePublished - Jun 2020
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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