| Summary: | 碩士 === 國立臺灣科技大學 === 電子工程系 === 107 === This thesis presents a high performance 7 kW wireless power transfer (WPT) system applied on electric vehicle charging, and based on series-series resonant compensation topology. In the beginning, the basic introduction about WPT is illustrated. Equivalent models of non-ideal transformer and coupling inductance are analyzed to simplify the equivalent circuit of resonant tank. In addition, series-series resonant compensation topology and LCC resonant compensation topology are introduced and comparison. Sum up the consideration and application, series-series resonant compensation topology is chosen to be the main structure of WPT. Then, First Harmonic Analysis(FHA) is used to predigest the circuit operation and find out proper operating interval, also choose better control method for the wide output voltage range application.
A design method is proposed that can guarantee output voltage meet the specification with series-series compensated WPT system under given coupling coefficient variation range, load range in this thesis. In order to reduce switching loss on the primary side power switches, the converter is designed and controlled with Zero-Voltage-Switching(ZVS). Finally, a prototype high performance 7 kW WPT system is built and tested. The prototype efficiency is 96% under full load and 170 mm coil distance, and 95% under full load and 210 mm coil distance.
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