Design and analysis of the LCL resonant convertor in inductive Power Transfer system

In inductive Power Transfer (IPT) application, minimum supply VA rating and convertor conduction loss are two important design purposes. The LCL resonant convertor can achieve both of these objects when designed appropriately. In this paper, the LCL resonant tank is changed into two LC resonant networks, then the unity power factor compensation parameter which can minimum supply VA rating and current amplify compensation parameter which can minimum the conduction loss are designed in two independent steps. Furthermore, the bifurcation phenomena (multiple primary zero phase angle frequency) of the system is analyzed, and the necessary parameter criteria for achieving quasi-sinusoidal convertor current is obtained. Finally, the system´s power transfer capability and efficiency calculation method are presented. Simulation and experiment results have verified the theoretical prospection.