Efficiency optimising scheme for wireless power transfer system with two transmitters

Abstract

The highest power transfer efficiency (PTE) of the magnetic resonance wireless power transfer (WPT) system with two transmitters (TXs) and a single receiver located at an arbitrary position can be obtained by adjusting the amplitude ratio and the phase difference (PD) of the signals of two adjacent TXs. The coupling coefficient between two coils is calculated, and is used to establish an equivalent circuit model for a WPT system with two TXs. Using the circuit model, the PTE of the WPT system (which is a function of the amplitude ratio and PD) is extracted. The optimum conditions of these values to achieve the highest power efficiency can be analytically determined. The experimental results agree well with the simulated results based on the analysis. The result shows that the suggested optimised transmit scheme can achieve the highest PTE for a magnetic resonance WPT system with two TXs.