Ultraviolet photo-lithography is employed to introduce two-dimensional （2D） photonic crystal （PC） structure on the top surface of GaN-based light emitting diode （LED）. PC patterns are transferred to 460-rimthick...Ultraviolet photo-lithography is employed to introduce two-dimensional （2D） photonic crystal （PC） structure on the top surface of GaN-based light emitting diode （LED）. PC patterns are transferred to 460-rimthick transparent indium tin oxide （ITO） electrode by inductively coupled plasma （ICP） etching. Light intensity of PC-LED can be enhanced by 38% comparing with the one without PC structure. Rigorous coupled wave analysis method is performed to calculate the light transmission spectrum of PC slab. Simulation results indicate that total internal reflect angle which modulated by PC structure has been increased by 7°, which means that the light extraction efficiency is enhanced outstandingly.展开更多
针对感应耦合电能传输(inductively coupled power transfer,ICPT)系统能效(传输功率和效率)优化问题,分析了互感耦合参数对4种典型拓扑结构ICPT系统能效的影响,并优化互感以提高系统的功率传输能力,同时,对优化得到的互感耦合参数的适...针对感应耦合电能传输(inductively coupled power transfer,ICPT)系统能效(传输功率和效率)优化问题,分析了互感耦合参数对4种典型拓扑结构ICPT系统能效的影响,并优化互感以提高系统的功率传输能力,同时,对优化得到的互感耦合参数的适用条件给出了限制;此外,针对原边采用串联补偿拓扑结构的ICPT系统在最大功率传输条件下,系统效率偏低的现象,提出一种新的系统综合评价指标。在满足系统输出功率的基础上,该指标综合考虑了系统效率、成本和可靠性等其他因素。通过在该指标下对系统的互感耦合参数进行优化,在满足功率传输的基础上,实现了ICPT系统的全局最优设计。最后,通过仿真和实验研究,证明了理论分析的正确性。展开更多
为解决传统多负载感应耦合电能传输(inductively coupled power transfer,ICPT)系统存在的问题,提出一种新型多负载变拓扑感应耦合电能传输系统。该新型ICPT系统主要采用可变拓扑的高频逆变器,通过检测负载信息,系统可根据任一时刻供电...为解决传统多负载感应耦合电能传输(inductively coupled power transfer,ICPT)系统存在的问题,提出一种新型多负载变拓扑感应耦合电能传输系统。该新型ICPT系统主要采用可变拓扑的高频逆变器,通过检测负载信息,系统可根据任一时刻供电负载的数量,自动改变逆变器工作结构,只让需要供电的负载所对应的原边线圈处于工作状态,从而基于"点对点"模式实现负载高效无线供电。仿真与实验验证了该新型多负载变拓扑感应耦合电能传输系统的可行性,对桌面多负载无线供电领域的设计与应用有着广泛的应用指导意义。展开更多
基金the National Natural Science Foundation of China (Nos.60736037,60537010,and 60807010)the National "973" Program of China (Nos.2009CB320300 and 2010CB934104)
文摘Ultraviolet photo-lithography is employed to introduce two-dimensional （2D） photonic crystal （PC） structure on the top surface of GaN-based light emitting diode （LED）. PC patterns are transferred to 460-rimthick transparent indium tin oxide （ITO） electrode by inductively coupled plasma （ICP） etching. Light intensity of PC-LED can be enhanced by 38% comparing with the one without PC structure. Rigorous coupled wave analysis method is performed to calculate the light transmission spectrum of PC slab. Simulation results indicate that total internal reflect angle which modulated by PC structure has been increased by 7°, which means that the light extraction efficiency is enhanced outstandingly.
文摘针对感应耦合电能传输(inductively coupled power transfer,ICPT)系统能效(传输功率和效率)优化问题,分析了互感耦合参数对4种典型拓扑结构ICPT系统能效的影响,并优化互感以提高系统的功率传输能力,同时,对优化得到的互感耦合参数的适用条件给出了限制;此外,针对原边采用串联补偿拓扑结构的ICPT系统在最大功率传输条件下,系统效率偏低的现象,提出一种新的系统综合评价指标。在满足系统输出功率的基础上,该指标综合考虑了系统效率、成本和可靠性等其他因素。通过在该指标下对系统的互感耦合参数进行优化,在满足功率传输的基础上,实现了ICPT系统的全局最优设计。最后,通过仿真和实验研究,证明了理论分析的正确性。
文摘为解决传统多负载感应耦合电能传输(inductively coupled power transfer,ICPT)系统存在的问题,提出一种新型多负载变拓扑感应耦合电能传输系统。该新型ICPT系统主要采用可变拓扑的高频逆变器,通过检测负载信息,系统可根据任一时刻供电负载的数量,自动改变逆变器工作结构,只让需要供电的负载所对应的原边线圈处于工作状态,从而基于"点对点"模式实现负载高效无线供电。仿真与实验验证了该新型多负载变拓扑感应耦合电能传输系统的可行性,对桌面多负载无线供电领域的设计与应用有着广泛的应用指导意义。
