Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Operating area analysis and design of WPT systems with MEPT control

  • Gao, Weipeng (School of Electrical Engineering, Xinjiang University) ;
  • Fan, Yanfang (School of Electrical Engineering, Xinjiang University) ;
  • Wang, Chengxuan (School of Electrical Engineering, Xinjiang University) ;
  • Wang, Kangping (School of Electrical Engineering, Xi'an Jiaotong University) ;
  • Li, Hongchang (School of Electrical Engineering, Xinjiang University)
  • Received : 2021.09.16
  • Accepted : 2022.01.17
  • Published : 2022.04.20
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Abstract

Coupled resonant tanks are key parts of wireless power transfer (WPT) systems with magnetic resonant coupling. Researchers have proposed different resonant tank design methods to improve power transfer efficiency, increase power density, reduce magnetic flux leakage, or lower VA ratings. Practical WPT systems require a closed-loop control to cope with the variations of operation conditions, but only a few studies have considered the safe operating area (SOA) of systems under closed-loop control in resonant tanks designs. In this work, we analyze closed-loop voltage and current stress characteristics from the aspect of maximum efficiency point tracking control and derive the SOA with a given set of stress limits. Then, we propose a resonant parameter design method of allowing the system to safely operate with any specified range of coupling coefficient and output power. The current stress was minimized in the design to reduce the conductive loss. As for the verification, an experimental prototype was built according to the design method.

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References

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