Analysis and Control of the Start-up Current of the Primary Side Inverter in Inductive Power Transfer System

The direct start-up of high power inductive power transfer (IPT) system may cause large inrush current. In order to analyze the dynamic behavior, general state space average (GSSA) models of the primary serial and secondary serial compensated (S/S) IPT, and primary LCC compensated and secondary serial compensated (LCC/S) IPT are presented. By model predictions and simulations, it is found out that the direct start inrush current of the primary inverter is relatively small for S/S and is large for LCC/S IPT. New methods for suppressing the inrush currents for LCC/S IPT such as pre-charging the secondary side rectifier capacitor are given. The effectiveness of the proposed methods has been verified by both simulations and experiments.