Abstract
This study investigates the statistic behavior and parameter estimation problems of a double-sided, LCC-compensated, wireless power transfer system. Based on the commonly used wireless charging circuit model, this study proposes a five-step parameter estimation method, which is applicable to automotive static wireless charging systems. The eight parameters in the circuit model of this study are the most important key components of the wireless charging system. The study also found that, under certain conditions, the statistic mode of wireless charging systems has a specific distribution. However, the current status of these eight components for wireless charging of electric vehicles will have complex parameter drift problems. These drift problems will deteriorate the performance of the vehicle power systems. This study probes these factors and proposes some related mathematical theories. The noted factors can be applied to the analysis of the wireless charging system and provide alternative solutions to explain the deteriorations from coil misalignments. Both simulations and experiments are given to show the evaluated issues of the proposed study.
Highlights
A wireless power transfer (WPT) system is a resonant circuit consisting of transmitting and receiving coils and a compensation circuit
Depending on how the compensation capacitors are added to the transmitting and receiving coils, they are named as series–series (SS), series–parallel (SP), parallel–series (PS), and parallel–parallel (PP) topologies [3,4]
The compensation capacitor is determined by the self-inductance, so coil misalignment does not significantly affect the resonance
Summary
A wireless power transfer (WPT) system is a resonant circuit consisting of transmitting and receiving coils and a compensation circuit. The compensation circuit determines the system performance, so its topology and parameter design have become the most important part of WPT systems. Regarding the wireless power transfer, many approaches are referenced and studied, such as magnetic flux induction, two-coil loosely coupled transformer, microwaves, and lasers [1,2]. Even when no load is placed in the load side, this topology can maintain suitable power distributions This feature is very suitable for dynamic WPT because misalignment will commonly appear during the dynamic charging. The circuit can be designed to provide zero-voltage-switching (ZVS) for the input inverter and eliminate the reverse recovery loss in the rectifier, so the system efficiency can reach 96%.
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