Abstract
Modeling of the wireless power transfer (WPT) system is the premise to design and control it. First-harmonic-analysis (FHA) is a simple and effective method to model the WPT system, but its accuracy may decrease with the variation of load in a wide range. In this paper, harmonics are analyzed in the primary side of an LCC-S compensation network based WPT system, depicting a waveform of the output current of the inverter much closer to the real one compared with FHA based model. In the secondary side, the time-domain analysis is conducted both in CCM&DCM of the rectifier, deriving an equivalent input impedance featuring the non-linear characteristics of the system. Based on the proposed model, the parameters of the LCC network are designed, proving to tune the ZVS condition better than the FHA based method. Finally, the load of the system is estimated, achieving a high accuracy (with the estimating error less than 5%) in a wide range with a simple sampling method.
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