2014 11th China International Forum on Solid State Lighting (SSLCHINA)最新文献_第2页

Thermal analysis of light-emitting diodes based on photo-electro-thermal relationship 基于光电热学关系的发光二极管热分析

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127210

Xingfu Cheng, Xianming Liu, Weimin Chen, Wei Lai

{"title":"Thermal analysis of light-emitting diodes based on photo-electro-thermal relationship","authors":"Xingfu Cheng, Xianming Liu, Weimin Chen, Wei Lai","doi":"10.1109/SSLCHINA.2014.7127210","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2014.7127210","url":null,"abstract":"Thermal characteristics of light emitting diode (LED) devices directly effects on the luminous efficiency and long term reliability of LEDs. Junction temperature and thermal resistance are the main parameter that reflection of the heat dissipation capability of the LED device. In this study, relationships between thermal resistance and luminous flux and electrical power are simplified based on the photo-electrothermal theory. A new method using the optical-electrical characteristic of the LED is proposed to measure thermal resistance and junction temperature. The calculation of thermal resistance of the LED utilizes the reduction rate of luminous efficacy with the increasing temperature ke, heat dissipation coefficient kh, heat sink temperature Ths and the electric power corresponding to maximum luminous flux Pd*. The thermal resistances of different brands and different power of LED devices are measured; the measuring results are highly consistent with nominal thermal resistance, which confirms the feasibility and generality of the proposed method. This method is simple and credible, and requires no expensive thermal measuring instruments, making it valuable for engineering application.","PeriodicalId":361141,"journal":{"name":"2014 11th China International Forum on Solid State Lighting (SSLCHINA)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128066534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Driver design and application of HV LED 高压LED的驱动设计与应用

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127231

Yanjun Zhang, Mark Chang

引用次数: 0

Wireless-driven LED semiconductor lighting system 无线驱动LED半导体照明系统

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127224

Teng Zhan, Jun Ma, X. Yi, S. Koh, Junxi Wang, Xinxin Wu, Guohong Wang, Jinmin Li

{"title":"Wireless-driven LED semiconductor lighting system","authors":"Teng Zhan, Jun Ma, X. Yi, S. Koh, Junxi Wang, Xinxin Wu, Guohong Wang, Jinmin Li","doi":"10.1109/SSLCHINA.2014.7127224","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2014.7127224","url":null,"abstract":"This paper reports our laboratory's latest wireless-driven LED lighting system, which adopted wireless electrical energy transmission technology. Wireless power transfer technology is the transmission of electrical energy from a power source to an electrical load without man-made conductors. Traditional LED lighting system sensitive to rigid environment such as humidity, corrosive and flammable. Combining the advantages of wireless electrical power transfer and LED semiconductor lighting technology, the wireless-driven LED (WD-LED) lighting system has advantages of electrical shock protection, convenient, reliable, portable and environmentally sound. The wireless-driven LED lighting source will gain increasing attention in the civilian consumer electronics market, military area and special lighting areas. To achieve wireless electric power transfer in LED lighting system, the wireless-driven LED lighting system should contain LED lighting module, wireless electrical power transfer system, LED driving circuit and electrical energy storage system. The LED lighting module was driven by the electrical power, which was transferred from a contact free system. Either inductive coupling or magnetic resonance coupling is responsible for transferred the electrical power. Wireless-driven LED lighting system has a good market prospects, this new technology will make these innovative LED lighting products more available, convenient and reliable. In this paper, we mainly research in wireless electrical energy transmission tech, LED integrated package tech, LED driver circuit tech. Finally, we introduce several wireless-driven LED lighting products in different application areas.","PeriodicalId":361141,"journal":{"name":"2014 11th China International Forum on Solid State Lighting (SSLCHINA)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126036786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

A highly efficiency flashlight module based on modified fresnel lens 一种基于改进菲涅耳透镜的高效手电筒模块

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127244

Chi‐Feng Chen, Shin-Hong Kuo

{"title":"A highly efficiency flashlight module based on modified fresnel lens","authors":"Chi‐Feng Chen, Shin-Hong Kuo","doi":"10.1109/SSLCHINA.2014.7127244","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2014.7127244","url":null,"abstract":"This study presents a design method of flashlight module with discontinuous refractive surfaces and total internal reflection (TIR) surfaces to achieve high optical qualities with thin lens. Our design is applied to the lens of 30mm focal length, which is generally the focal length of a mobile device. The flashlight module was constructed by optical simulation tool ASAP. We analyzed interrelation between the TIR surfaces and multiple optical qualities, such as the angle of light emitting and the uniformity of illuminance. The TIR surfaces were designed to maximize the uniformity and optical efficiency in the target viewing angle. After designing corresponding microstructures on the TIR surfaces, we can get a flashlight module of modified Fresnel lens with high optical qualities. Compared with the original LED source, the central illuminance improves to 1.5 times and the uniformity of target area improves to 1.3 times. This flashlight module can be used in products that require high quality photograph, such as cellphone, and tablet computer. The flashlight module of modified Fresnel lens is more energy-saving and carbon reduction due to optical efficiency increasing 1.7 times.","PeriodicalId":361141,"journal":{"name":"2014 11th China International Forum on Solid State Lighting (SSLCHINA)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134424033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

An overview of light decay failure modes in lead-frame LED packages 引线框架LED封装的光衰失效模式概述

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127247

Youxing Yuan, He Wang, J. G. Liu

引用次数: 3

The discussion of LED outdoor display's light pollution and technical solution LED户外显示屏的光污染及技术解决方案探讨

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127223

Tu Menglong

引用次数: 0

A novel current sharing method without the signal line for multi-output LED driver 一种新颖的无信号线多输出LED驱动电流分担方法

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127211

Bingyi Ke, Weiming Lin

引用次数: 6

The applications of Ga-doped ZnO films on LED chips ga掺杂ZnO薄膜在LED芯片上的应用

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127217

L. Yin, T. Han, J. Wang

引用次数: 0

Research and outlook of wireless flip chip package technology development 无线倒装封装技术发展研究与展望

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127239

X. Xiong, Fang Liu, Y. Liu, Li Ma, Qi Wang

{"title":"Research and outlook of wireless flip chip package technology development","authors":"X. Xiong, Fang Liu, Y. Liu, Li Ma, Qi Wang","doi":"10.1109/SSLCHINA.2014.7127239","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2014.7127239","url":null,"abstract":"The progress of technology and the demand of market are the two impetus of the development of LED industry. The package of LED has undergone the various traditional dress package and the wired flip chip package. With the change of market demand and the development of the manufacturer and package of LED chip, the package of LED is orientating high-power, high-efficient, multi-chip integration, and miniaturization. In this paper we summarized the development process of LED package in China, analyzed the chip structure of the traditional dress package LED, the wired flip chip package LED and the wireless flip chip package LED, and their advantages and disadvantages. Finally, we argued that the wireless flip chip package of LED will be the mainstream technology of LED package in the future. The package of wireless flip chip of LED will have two molds, one is that white light devices are produced directly by the LED chip manufacturer, the other molds is that all kinds of wireless packaging products are produced by the packaging manufacturer with the LED chips which are made by the chip manufacturers with class of eutectic.","PeriodicalId":361141,"journal":{"name":"2014 11th China International Forum on Solid State Lighting (SSLCHINA)","volume":"38 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132708425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

The research and implementation of multi-sensor collaboration in a smart lighting control system based on smart city operating system i-stack 基于智慧城市操作系统i-stack的智能照明控制系统中多传感器协同的研究与实现

2014 11th China International Forum on Solid State Lighting (SSLCHINA) Pub Date : 2014-11-01 DOI: 10.1109/SSLCHINA.2014.7127221

Chong Gao, Gary Yang, Chao Liu

{"title":"The research and implementation of multi-sensor collaboration in a smart lighting control system based on smart city operating system i-stack","authors":"Chong Gao, Gary Yang, Chao Liu","doi":"10.1109/SSLCHINA.2014.7127221","DOIUrl":"https://doi.org/10.1109/SSLCHINA.2014.7127221","url":null,"abstract":"In order to make full use of a wide variety of surrounding user devices, and further to provide users with real-time, high efficiency and high quality services, it has become a necessary demand for a variety of terminals to work together and jointly provide services. At the same time, it is difficult to obtain the accurate response of the control request with only one kind of device, the control result cannot satisfy the user requirements. Based on Cloud of Things, a smart city operating system i-stack is proposed. And then based on this smart city operating system and multiple sensors collaboration technology, a new smart city operating system architecture for smart lighting control system is proposed. The ultimate intention is to link up many kinds of sensors in the lighting system via a wireless sensor network (ZigBee for example). Users can configure and use these sensors in an Event-Condition-Action mode from the remote management platform. This new system can provide users with a great quality of experience by collaborating multiple devices in its surroundings and aggregating capacities adaptively.","PeriodicalId":361141,"journal":{"name":"2014 11th China International Forum on Solid State Lighting (SSLCHINA)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129335673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1