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A lumped inductive power transfer system (IPT) with multiple modular pads differs from a stand-alone system. The magnetic coupling between adjacent modules is affected by the flux cancelation which further affects the power transmission. Thus, it is important to investigate the relationship between flux cancelation and system configuration. In this paper, the basic connection and operating mechanism for a modular IPT system are first discussed. Six cases are designed for two scenarios, including single and multiple secondary modules. Performances are compared in various primary excitation modes and secondary connection modes. Results show that the direction of canceled flux is determined by these modes. Matched modes will bring either a higher or a more stable coupling. And unmatched modes between primary and secondary sides tend to have the lowest coupling performance due to severe flux cancelation. Results provide a guidance for system design aiming at different power transfer characteristics.

A COMPARATIVE STUDY OF FLUX CANCELLATION AMONG MULTIPLE INTERCONNECTED MODULAR PADS IN LUMPED IPT SYSTEM