近些年，无线电能传输技术受到了越来越广泛的关注。作为一种中等距离无线电能传输技术，自从美国麻省理工学院于2007年发表其研究成果后，磁耦合谐振式无线电能传输技术就成为了研究热点问题。该文在对无线电能传输技术进行总体介绍的基础上，主要对磁耦合谐振式无线电能传输技术进行概括论述。首先分析了磁耦合谐振式无线电能传输技术的基本结构和工作原理，介绍了目前运用于分析该技术的主要理论；接着对该技术目前的传输水平和热点问题进行了分类阐释，主要分为传输特性、新材料的应用、干扰问题和实际应用，介绍了目前的研究现状；最后在当前研究热点问题的基础之上，对该技术有待研究的问题以及发展趋势进行了展望。

近些年，无线电能传输技术受到了越来越广泛的关注。作为一种中等距离无线电能传输技术，自从美国麻省理工学院于2007年发表其研究成果后，磁耦合谐振式无线电能传输技术就成为了研究热点问题。该文在对无线电能传输技术进行总体介绍的基础上，主要对磁耦合谐振式无线电能传输技术进行概括论述。首先分析了磁耦合谐振式无线电能传输技术的基本结构和工作原理，介绍了目前运用于分析该技术的主要理论；接着对该技术目前的传输水平和热点问题进行了分类阐释，主要分为传输特性、新材料的应用、干扰问题和实际应用，介绍了目前的研究现状；最后在当前研究热点问题的基础之上，对该技术有待研究的问题以及发展趋势进行了展望。

Frequency drift has considerable adverse effects on the inductively coupled power transfer (ICPT) system such as decrease of transmission power and distance, EMC interference, system detuning and performance deterioration, and deviated operation from system design requirements endangering the stability so that robust control of ICPT system remains an open applied research problem. This article presents a relevant uncertain model for the LCL resonant ICPT system first via the generalized state-space averaging and the LFT methods, and then a solution to H, controller synthesis by making use of the LMI method. The control design is first tested by computer simulation and thereafter verified by means of physical experiments. The results show that by applying the proposed Ho, synthesis controller the overall system has achieved both predetermined robustness with respect to the norm-bounded load and frequency uncertainties and dynamically tracking the voltage references according to the actual power demands. (C) 2012 Elsevier Ltd.

An automated frequency tracking system is implemented for an efficient mid-range magnetic resonance wireless power transfer based on an analysis of a wireless power link consisting of transmitting and receiving resonators placed in a strong coupling region.The proposed tracking system is designed to maintain a power transfer efficiency of more than 70% for any transfer distance range by directly monitoring the efficiency via out-band communication. The advantage of the proposed system over other frequency tracking schemes is that the performance of the resonators and power amplifier can be applied to the tracking algorithm. (C) 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:14231426, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26858

In order to suppress the fast decrease of the transfer efficiency of magnetic resonance coupled wireless power transfer system (MRCWPTS) with distance increase, this paper investigates the impact factors of the system transfer efficiency and is, then formulates a new efficiency optimal control method based on frequency control. Based upon this control method two optimal control schemes are designed to achieve transfer efficiency control of the system. Simulations and experiments show that the proposed efficiency optimal control method can effectively stabilize the system transfer efficiency in a certain range so as to successfully solve the subtle issue of transfer efficiency variation with distance.

As an emerging research field, inductively coupled wireless power transfer (ICWPT) technology has attracted wide spread at-tention recently. In this paper, the maximum power transfer performances of four basic topologies labeled as SS, SP, PS and PP are investigated. By modeling the equivalent circuits of these topologies in high frequency (HF), the primary resonance compensation capacitances for maximum power transfer capability are deduced. It is found that these capacitances fluctuate with load resistance change, which is disadvantageous to SP, PS and PP topologies and an obstacle to their practical applications as well. To solve this problem, a phase controlled inductor circuit is proposed. By adjusting the triggering angle, the real-time dynamic tuning control can be achieved to guarantee maximum power transfer. Finally, simulations and experiments show that the proposed method is of great effectiveness and reliability to solve the issue of resonance compensation capacitance fluctuation with load change and to guarantee the flexible applications of all topologies.

This study was conducted to evaluate the impact of varying scleral material properties on the biomechanical response of the cornea under air-puff induced deformation. Twenty pairs of human donor eyes were obtained for this study. One eye from each pair had its sclera stiffened using 4% glutaraldehyde, while the fellow eye served as control for uniaxial strip testing. The whole globes were mounted in a rigid holder and intraocular pressure (IOP) was set using a saline column. Dynamic corneal response parameters were measured before and after scleral stiffening using the CorVis ST, a dynamic Scheimpflug analyzer. IOP was set to 10, 20, 30, and 40 mmHg, with at least 3 examinations performed at each pressure step. Uniaxial tensile testing data were fit to a neo-Hookean model to estimate the Young's modulus of treated and untreated sclera. Scleral Young's modulus was found to be significantly correlated with several response parameters, including Highest Concavity Deformation Amplitude, Peak Distance, Highest Concavity Radius, and Stiffness Parameter-Highest Concavity (SP-HC). The interaction between IOP and scleral Young's modulus was significantly correlated only to HC Deformation Amplitude. There were significant increases in SP-HC after scleral stiffening at multiple levels of IOP, while no significant difference was observed in the corneal Stiffness Parameter - Applanation 1 (SP-A1) at any level of IOP. Scleral mechanical properties significantly influenced the corneal deformation response to an air-puff. The stiffer the sclera, the greater the constraining effect on corneal deformation resulting in lower displaced amplitude. This may have important clinical implications and suggests that both corneal and scleral material properties contribute to the observed corneal response in air-puff induced deformation.

This study was conducted to evaluate the impact of varying scleral material properties on the biomechanical response of the cornea under air-puff induced deformation. Twenty pairs of human donor eyes were obtained for this study. One eye from each pair had its sclera stiffened using 4% glutaraldehyde, while the fellow eye served as control for uniaxial strip testing. The whole globes were mounted in a rigid holder and intraocular pressure (IOP) was set using a saline column. Dynamic corneal response parameters were measured before and after scleral stiffening using the CorVis ST, a dynamic Scheimpflug analyzer. IOP was set to 10, 20, 30, and 40 mmHg, with at least 3 examinations performed at each pressure step. Uniaxial tensile testing data were fit to a neo-Hookean model to estimate the Young's modulus of treated and untreated sclera. Scleral Young's modulus was found to be significantly correlated with several response parameters, including Highest Concavity Deformation Amplitude, Peak Distance, Highest Concavity Radius, and Stiffness Parameter-Highest Concavity (SP-HC). The interaction between IOP and scleral Young's modulus was significantly correlated only to HC Deformation Amplitude. There were significant increases in SP-HC after scleral stiffening at multiple levels of IOP, while no significant difference was observed in the corneal Stiffness Parameter - Applanation 1 (SP-A1) at any level of IOP. Scleral mechanical properties significantly influenced the corneal deformation response to an air-puff. The stiffer the sclera, the greater the constraining effect on corneal deformation resulting in lower displaced amplitude. This may have important clinical implications and suggests that both corneal and scleral material properties contribute to the observed corneal response in air-puff induced deformation.