A Calculation Method for the Maximum Transmission Power in ICPT Systems Under Non-Sinusoidal Excitation

Abstract

Calculating the maximum transmission power of loosely coupled coils represents a crucial step in the design of inductively coupled power transfer (ICPT) systems. However, the majority of calculations for the maximum power transfer point (MPTP) are exclusively relevant to scenarios featuring pure sinusoidal excitation. This paper introduces a more universally applicable solution for determining the MPTP in loosely coupled systems subjected to arbitrary excitations. The approach takes into account the contributions of both the fundamental waveform and all harmonics to the transmission capacity, offering a precise method for investigating the maximum power capacity of ICPT systems under non-sinusoidal excitation. Through simulations and experiments, it is demonstrated that the proposed method yields improved agreement with various waveform excitations, including square/triangular waves, as well as actual chopping waves characterized by large-scale ringing and overshoot. The versatility of the method extends to various inductively coupled systems with generic excitations, encompassing non-resonant-type, direct chopper, or multi-level inverter-driven ICPT systems. Furthermore, the method ensures greater accuracy in instances of excitation distortion induced by nonlinear effects.INDEX TERMS ICPT, Maximum power transfer, Non-sinusoidal, Wireless power transmission