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On-Chip Boost DC-DC Converter in Color OLED Driver & Controller ICs for Mobile Application

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On-Chip Boost DC-DC Converter in Color OLED Driver & Control...

2005 6th International Conference on ASIC

作者： Ding Ge Zhiliang Chen Institute of Microelectronics Tsinghua University

ISBN: (纸本)0780392108;9780780392106;0780392108;9780780392106

On-chip boost DC-DC converter used in color OLED driver & controller ICs for mobile application is presented in this paper.For special systematic requirement,current-limited pulse-frequency modulation (PFM) control scheme is used.This converter is designed with 0.35um 1P4M high-voltage CMOS process. Experimental results show that,the converter can operate with supply voltage from 2.5 to 4.2V,which is suitable for single-cell lithium-ion rechargeable battery supply application,and boost voltage up to 12～18V for illumining OLED display pixels.The output ripple voltage is about 250mV with 6.8μF off-chip capacitor and 10μH off-chip inductor.The power efficiency is over 75%for 100mA load current,maximum to 87%at about 200mA load current.

关键词： DC-DC power converters Organic light emitting diodes Voltage Pulse modulation Control systems CMOS process Batteries Flat panel displays Capacitors Inductors

Design and Development of Power Optimized Satellite Elephant Collar with Over the Air Programmability

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Design and Development of Power Optimized Satellite Elephant...

2012 IEEE 6th International Conference on Information and Automation for Sustainability（ICIAFS2012）

作者： Buddhika I.Annasiwaththa Rohan Munasinghe Pruthuviraj Fernando Peter Leimgruber Department of Electronic and Telecommunication Engineering University of Moratuwa Center for Conservation And Research Conservation Ecology Center Smithsonian Conservation Biology InstituteU.S.A

A satellite elephant collar is a device mounted on an elephant’s neck to track its position and movements.This information is essential for conservation and management of this highly endangered species.Currently available units are proprietary designs by few manufacturers and no literature can be found about their internal operation.This lack of published information hampers the evolution and development of future collaring systems with increased features and functionalities for research,conservation and management.Critical issues for improvement include live time of the collar,which is related to power consumption and operational modes of the unites,and remote programmability allowing for changes in data acquisition during deployment.Most commercially available collars lack the ability to change data acquisition schedules remotely over the air,and therefore data acquisition is un-optimized,which is directly responsible for un-optimized power consumption.This research was conducted to develop a satellite elephant collar with improved lifetime and remote programmability.A second purpose of our research was to make information on how to built elephant collars needs to become widely available to the user community,.This paper presents the particular issue of power optimization of satellite elephant collars.A functional test collar was designed using general purpose electronic components and a number of software and hardware optimization methods used during development which are presented in this paper.An expected life time over 580 days was achieved with eight D size Ultralife U10015 Batteries for the prototype collar.

关键词： Global Positioning System Satellites Batteries Transceivers Hardware Satellite broadcasting Base stations

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Solar-Electric Boat

Journal of Transportation Technologies 2012年第2期2卷 144-149页

作者： Giuseppe Schirripa Spagnolo Donato Papalillo Andrea Martocchia Giuseppe Makary Department of Electronic Engineering University “Roma Tre” Roma Italy

The aim of this paper is the design of a Solar-Electric Boat for tourists’ transport along the coast, in the rivers, in the lakes. Our idea is to define the project guidelines for the realization of a zero impact boat. This paper illustrates the practical new technologies (naval architecture small craft design, mechanical and electrical design), rational design and engineering approach, safety and reliability methods used in solar boats. In our project, the boat is powered by lithiumion Batteries that can be charged at any time by the photovoltaic generator placed on a flat top structure. The project is designed for brief trip around coast, where the public transport becomes very polluting during summer. Starting from the consideration that this boat is used during sunny weather, it is possible to know the boat’s energy demand and proceed with the design of a suitable electric boat and of the energy storage/management system. It is also proposed an innovative management of charge/discharge of the Batteries. With this management, we have optimized the use and prolonged the time of life of the Batteries during the navigation and the control of the real autonomy of it.

关键词： Solar-Electric Ship Electric Propulsion Photovoltaic Lithium-Ion Batteries

Effects of cathode materials on discharge characteristics of Li B alloy/FeS_2 thermal battery

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中国有色金属学会会刊：英文版 1999年第3期9卷 530-534页

作者： Liu Zhijian(刘志坚), Duan Wei(段伟), Li Zhiyou(李志友), Huang Yinghua(黄英华) ,Qu Xuanhui(曲选辉),Huang Baiyun(黄伯云) Powder Metallurgy Institute, Central South University of Technology, Changsha 410083, P.R.China  Jinzhu Powder Injection Man 中南工业大学粉末冶金所湖南长沙山东金珠粉末注射制造有限公司山东济南

The effects of FeS 2 on the discharge characteristics of Li B alloy/FeS 2 thermal battery had been studied. Results showed that 2.5%(mass fraction)Li 2O would be needed to rule out the voltage pulse in the first part of discharge curves for the FeS 2 powder of small particle size (<44 μm). After thermal decomposition, the FeS 2 had transformed to Fe (1- x ) S where x =0.024～0.066. The deficiency of the cathode FeS 2 would make discharge voltage decrease 0.4 V. In the discharge test at high temperature (600 ℃), the discharge voltage decreased fast with the acceleration of the thermal decomposition of FeS 2.

关键词： LiB FeS 2 thermal Batteries cathode effect

afety-reinforced rechargeable Li-CO2 battery based on a composite olid state electrolyte

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Nano Research 2019年第10期12卷 2543-2548页

作者： lui Wang Xuejing Zhang Yichao Cai Qingshun Nian Zhanliang Tao Jun Chen Key Laboratory of Advanced Energy Materiah Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

The rechargeable Li-CO2 battery has been receiving significant attention owing to its merits of high energy density and the efficient utilization of CO2.However,the widely application is plagued by severe security risks,such as leakage,flammability and lithium dendrites growth due to the use of liquid organic electrolytes.Here,a composite solid state electrolyte consisting of polyethylene oxide(PEO)and 20 wt.%Li7La3Zr1.4Tao.6O12(LLZTO)was prepared and first introduced into L1-CO2 battery to solve the problems.The composite solid state electrolyte exhibited high ionic conductivity(1.03 x 10'3 S cm-1 at 70℃),wide electrochemical window(5 V vs.Li+/Li),good mechanical properties and excellent flexibility.Ultimately,the Li symmetric cell with PEO/LLZTO composite solid state electrolyte can operate 1,500 h at a current density of 0.1 mA·cm-2.The assembled all-solid-state Li-CO2 battery behaved a long cycle life of 70 cycles ata current density of 100 mA·g-1 with fixed capacity of 1,000 mAh·g^-1.Our work provides new perspective to develop rechargeable all-solid-state L1-CO2 Batteries.

关键词： U-CO2 Batteries solid state electrolyte composite safety

Spindle-like FeySs/N-doped carbon nanohybrids for high-performance sodium ion battery anodes

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Nano Research 2019年第3期12卷 695-700页

作者： Aihua Jin Mi-Ju Kim Kug-Seung Lee Seung-Ho Yu Yung-Eun Sung Center for Nanoparticle Research Institute for Basic Science (IBS) Seoul 08826 Republic of Korea School cf Chemical and Biological Engineering Seoul National University Seoul 08826 Republic cf Korea Beamline Department Pohang Accelerator Laboratory (PAL) Pohang 790-784 Republic of Korea Department of Chemistry and Chemical Biology Cornell University Ithaca New York 14853 USA

Iron sulfides have bee n con sidered as one of the most promising can didates for sodium ion battery anode materials due to their high theoretical capacity and low cost. I n this work, spin dle-like Fe7S8 with n itroge rvdoped carb on (FeiS/N-C) nano hybrids are successfully syn thesized via a solvothermal method by sulfidation iron-based metal organic framework (FeMOF). As sodium ion battery an odes, FeySs/N-C nano hybrids exhibit high reversible capacity of 450.8 mAh g-1 at 200 mA·g^-1, and 406.7 mAh·g^-1 at 500 mA·g^-1 even after 500 cycles. They also show excellent rate properties and delivering the capacity of 327.8 mAh·g^-1 at a very high current density of 3.2 A·g^-1. These outstanding electrochemical performa nces can be attributed to the unique structure of Fe7S8/ N-C nan ohybrids. The nano scale dime nsion in their size can be ben eficial for facile ion and electro n tran sports. Furthermore, the stable n itroge n doped carb on frameworks can also improve electrical conductivity and relieve the problems related to volume expansion. X-ray absorption spectroscopy and X-ray photoelectron spectroscopy analyses have been performed to study reactions occurred in spindle-like FeySs/N-C nanohybrid electrode at both bulk and surface.

关键词： sodium ion Batteries iron sulfides metal organic frameworks X-ray absorption spectroscopy X-ray photoelectron spectroscopy

A Structural and Morphological Study of LiCo_1-XSm_XO_Y Powders Obtained by the Sol-Gel Method

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Advances in Nanoparticles 2022年第1期11卷 1-12页

作者： Víctor H. Colín Calderón Antonieta García Murillo Felipe de Jesus Carrillo Romo Arturo Cervantes Tobón Instituto Politécnico Nacional CIITEC Cerrada de Cecati s/n Azcapotzalco Santa Catarina México Instituto Politécnico Nacional-ESIQIE Av. Instituto Politécnico Nacional s/n. Mexico City México

In this study, the synthesis of LiCo1-XSmXOy powders (X = 0.002, 0.004, 0.006, 0.008, and 0.1) by the sol-gel method and the influence of Sm on their structural and morphological properties is reported for the first time. The results of x-ray diffraction (XRD) studies show that LiCoO2 powders synthesized at temperatures up to 700°C present a characteristic hexagonal crystalline phase of the α-NaFeO2 type (space group R-3m), revealing a shift in the (0 0 3) Bragg reflection, which reflects the presence of Sm in the crystalline structure. The morphology was spheroidal and, on average, 122 nm in size. Based on the data obtained, LiCo1-XSmXOy powders (X = 0.002, 0.004, 0.006, 0.008, and 0.1) show promise as a material for use in the cathodes of lithium-ion Batteries.

关键词： Cathode Batteries Samarium Sol-Gel Nanoparticles

Mutual Information and Energy Tradeoff in Correlated Wireless Sensor Networks

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Mutual Information and Energy Tradeoff in Correlated Wireles...

2008 IEEE International Conference on Communications(ICC 2008)

作者： Laxminarayana S Pillutla Vikram Krishnamurthy Department of Electrical and Computer Engineering The University of British Columbia 2332 Main Mall VancouverBC V6T1Z4Canada

We consider comparison of Mutual Information （MI）-Energy tradeoff in correlated wireless sensor network （WSN） for cooperative multiple input and multiple output （MIMO） and non-cooperative （referred to as single input and single output （SISO）） transmission schemes.Our numerical results indicate that for short distances SISO schemes achieve better MI-Energy tradeoff than the cooperative MIMO schemes,while for long distances the cooperative MIMO schemes achieve better MI-Energy tradeoff.We next consider the issue of sensor placement in a correlated WSN.Specifically,we prove that the spacing between nodes to maximize MI is in general an increasing function of observation SNR.From this structural result,we conclude that at high SNR,the various stages of the WSN can be separated by relatively large distances than at low SNR.

关键词： Mutual information Wireless sensor networks MIMO Peer to peer computing Energy consumption Communications Society Batteries Encoding Energy efficiency Source coding

Mechanism of lithium insertion in carbons pyrolyzed at low temperature

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Chinese Science Bulletin 1999年第5期44卷 385-390页

作者： Hongqi Xiang Shibi Fang Yingyan Jiang Chinese Acad Sci Inst Chem Beijing 100080 Peoples R China Tsing Hua Univ Dept Chem Beijing 100084 Peoples R China

Carbons pyrolyzed at temperature ranging from 500℃ to 1 000℃ are premising materials for high-energy density lithium Batteries. These carbons not only possess a capacity higher than the theoretical value of graphite, but also display a different electrochemical behavior from that of graphite.Mechanisms now available for this phenomenon are reviewed after the presentation of mechanism of lithium intercalation in graphite. Based on the recent research, a new model for lithium insertion in carbons pyrolyzed at low temperature and some ideas for further study are proposed.

关键词： lithium ion Batteries anode carbonaceous materials mechanism.