Impact of connection type on the efficiency of wireless power transfer systems

Analysing a wireless power transfer system is necessary to understand its performance and how different parameters can affect it. The associated analysis can be used as a reference to choose the suitable parameters given the constraints in any required design. This paper presents: a theoretical analysis of four topologies of wireless power transfer systems; determines the efficiency and gives the associated experimental measurements. Magnetic resonance coupling theory is used in conjunction with basic circuit analysis in this study. The topologies studied are series-series SS, series-parallel SP, parallel-series PS and parallel-parallel PP connections. Each topology has a different performance for the same combination. This gives a variety from which to choose suitable designs for specific systems with different loads, where the impact of the load on the efficiency also needs to be considered.