Receiver Power Allocation and Transmitter Power Control Analysis for Multiple-Receiver Wireless Power Transfer Systems

As different power has its own receivers,this paper analyzes and designs a multiple-receiver wireless power transfer(WPT)system systematically.The equivalent circuit model of the system is established to analyze the key parameters including transmitter power,receiver power,transmission efficiency,and each receiver power allocation.A control circuit is proposed to achieve the maximum transmission efficiency and transmitter power control and arbitrary receiver power allocation ratios for different receivers.Through the proposed control circuit,receivers with different loads can allocate appropriate power according to its power demand,the transmitter power and system efficiency do not vary with the change of the number of receivers.Finally,this control circuit is validated using a 130-kHz WPT system with three receivers whose power received is 3:10:12,and the overall system efficiency can reach as high as 55.5%.

A Review of Leakage and Dispersion of LNG on the Ground

Based on the analysis of the whole process of LNG spill on land,the research methods of LNG pool expansion and heavy gas diffusion are summarized and analyzed.This paper reviews the experimental and analytical work performed to data on spill of LNG.Specifically,experiments on the spill of LNG onshore,as well as experiments and numerical study on heavy gas dispersion.Pool boiling and turbulence model are described and discussed,as well as models used to predict dispersion.Although there have been significant progress in understanding the behavior of LNG spills,technical knowledge gaps to improve hazard prediction are still identified.Some of the gaps can be addressed with current modeling and testing capabilities.Finally,a discussion of the state of knowledge,and recommendations to further improvement the understanding of the behavior of LNG spills onshore.