Maximizing the efficiency of LCLCL-T Compensated Wireless Power Transfer Systems with independent-load Characteristics for charging applications in Smart Home

current study focuses on optimizing the efficiency of an LCLCL-T compensated topology in wireless power transfer systems with load-independent output current capability for battery charging. Wireless battery chargers play key devices in smart homes. To improve efficiency in these chargers, various compensated topologies are employed. In particular, the symmetric compensated LCLCL-T topology has been extensively used due to its inherent features, such as constant current output (CC), and high ability to absorb parasitic elements. However, one of the main deficits of this resonant compensation is decreased load regulation despite controlling the frequency, and on the other hand, its efficiency decreases owing to an increase in the circulating current. Therefore, in this study, the parameters of the proposed topology are reconfigured by adjusting the KW/KVA as an index to a reduction of voltage/current stresses on their elements without changing the specified system-level parameters, such as the system operating frequency, and specified CC output. Moreover, the circuit performance in the high-frequency response under different conditions is analyzed in detail, to optimize the system efficiency. Finally, the proposed system is simulated in PSIM to design the specific parameter values, the sample topology is also carried out. Analytical results show that the proposed compensation has the minimum output current fluctuation versus variations of the coupling coefficient and other parameters. Moreover, the analysis proves that, compared with the conventional design method, the proposed method improves the topology efficiency under various loads, especially under light loads.