Load-Independent ZPA Conditions in Both Constant Current and Constant Voltage Modes of LCC-Series Compensated IPT System

摘要

In wireless EV charging application, constant current/constant voltage charging profile is desirable for LithiumIon battery load. In addition, it is not easy for a open-loop IPT system to achieve zero phase angle (ZPA) condition over the entire charge process without any additional control algorithm and auxiliary circuit. In this paper, a design method for the LCC-series compensated inductive power transfer (IPT) system is investigated to obtain not only load-independent current and voltage transfer characteristics but load-independent ZPA operating conditions in both constant current (CC) and constant votlage (CV) modes. A 3.3-kW LCC-series compensated IPT prototype has been implemented to demonstrate the feasibility and validity of the theoretical analysis.