Journal of Electrical Engineering ›› 2015, Vol. 10 ›› Issue (6): 47-57.

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Analysis on Different Topology Structures in Magnetic Coupling Resonant Wireless Power Transmission System

Tian Zijian1,Du Xinxin1,Fan Jing2,Cao Yangyang1   

  1. 1.China University of Mining &Technology (Beijing) Beijing 100083 China;
    2.Nanyang Institute of Technology Nanyang 473004 China
  • Received:2015-04-10 Online:2015-06-25 Published:2015-06-25

Abstract:

The man input variables in the wireless power transmission (WPT) system are the working frequency and the transmission distance while the goal is to obtain high output power and transmission efficiency. For WPT systems based on magnetic coupling resonance (MCR), the relations between input variables and the target depend on the topology. Using the method of equivalent circuit to analyze, in detail, four topological structures applied in MCR-based WPT systems-serial-serial (SS) structure, serial-parallel (SP) structure, parallel-serial (PS) structure and parallel-parallel (PP) structure -this paper obtains the expressions to calculate the output power and the transmission efficiency, studies and compares relations of the power and efficiency versus frequency and distance. It is found from theoretical study and simulation analysis that all of these four topological structures reach the optimal matching around the resonant frequency, and subsequently the best transmission distance is obtained. It is also proved that the maximum transmission efficiency of the system is associated with the structure of the circuit at the receiving end and has no necessary link with the structure of the circuit at the transmitting end. This paper also presents an experiment using the serial-parallel structure which has demonstrated that the result from both theoretical analysis and simulation are correct.

Key words: Magnetic coupling resonance, topologies, output power, transmission efficiency

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