Multiple-Objective-Based Optimal Energy Distribution for Wireless Power Transfer

摘要

Along with the increasing popularity of smart home, multi-coupling wireless power transfer (WPT) technique has shown significant potentials for portable electric-driven appliances. Accordingly, there existing growing diversity of charging requirements from various household appliances like mobile phones, iPad or laptop, for examples quick charging, the State of Charge (SoC), etc., therefore, the multi-coupling WPT system needs to deal with various charging requests simultaneously. Besides, the security of the wirelessly transmitted energy attracts attentions from researchers as well, especially for multiple WPT receivers coupling with the identical transmitting coil. Previously proposed energy encryption scheme utilized the characteristic of frequency sensitivity to encrypt the transmission channel . Consequently, the key point of delivering the maximum power is to ensure the impedance matching, especially adjusting the resonant capacitor of primary unit while the frequency is regulated randomly. As aforementioned, this paper proposes an optimal-distribution and maximum-power based system which can distribute the limited transmitted power to different receivers simultaneously based on the proposed multi-coupling energy distribution scheme utilizing a novel control algorithm, meanwhile the proposed system is able to compensate the change of capacitance voltage due to the change of resonant frequency on account of various standard of charging equipment. More importantly, the proposed compensation which can extend the range of resonant frequency significantly only need one capacitor with a brand new current injection topology named capacitance buffer rather than the traditional capacitor array, so the system can continuously adjust the impedance to the resonate state to maintain the maximum output power.