Separate Power Allocation and Control Method Based on Multiple Power Channels for Wireless Power Transfer

Most of the existing one-to-multiple wireless power transfer systems are single-channel one-to-multiple wireless power transfer (SOWPT) systems. They only utilize one power channel to charge multiple receivers. In this article, a novel multichannel one-to-multiple wireless power transfer (MOWPT) system is proposed, which can deliver power to different receivers simultaneously with separate power channels. In the proposed MOWPT system, the composited compensation topology is utilized to build multiple power channels, which possess totally different resonant frequencies and nearly do not affect each other. Compared with those existing SOWPT systems, the power of receivers of the proposed MOWPT system can be simply and separately controlled by changing the duty cycles of the inverters without a complex control method and extra dc-dc converters. In order to analyze the performances of the proposed MOWPT system, a 0-LC MOWPT system, which utilizes the air transformers to provide multiple power supplies of different frequencies, is modeled and analyzed in detail. Moreover, based on the analysis results, a corresponding parameter design method is proposed to simplify the design procedure of this MOWPT system. Finally, an experimental prototype is built up to verify the performances of the proposed MOWPT system and the parameter design method.