Study of the Effect of Transformer Windings Coupling Coefficient of Flyback Resonant Converter for Wireless Energy Transfer on its Output Characteristics

The article analyzes the influence of the coupling coefficient of the transformer windings on the output characteristics of the resonant flyback converter intended for use in applications for the implementation of contactless power transmission. Expressions for the theoretical calculation of the dependences of the output characteristics of the converter on the coupling coefficient have been obtained. The coupling coefficient has been calculated for the L-shaped transformer replacement circuit of the flyback resonant converter. A simulation experiment of the wireless capacitor charging using the flyback resonant converter has been carried out. Its results coincide with the theoretical ones. It has been established that during the flyback converter design., it is most appropriate to use an L-shaped transformer replacement circuit., which causes the difference between theoretical and experimental results within 2%.