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Power Supplies For Led Drivers

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Power Supplies for LED Driving

Power Supplies for LED Driving Book
Author : Steve Winder
Publisher : Newnes
Release : 2016-12-28
ISBN : 0081010249
Language : En, Es, Fr & De

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Book Description :

Power Supplies for LED Driving, Second Edition explores the wide use of light-emitting diodes due to their efficient use of power. The applications for power LEDs include traffic lights, street lamps, automotive lighting, architectural lights, theatre lighting, household light replacements, signage lighting (replacing neon strip lights and fluorescent tubes), LCD display backlighting, and many more. Powering (driving) these LED's is not always simple. Linear driving is inefficient and generates far too much heat. With a switching supply, the main issues are EMI, efficiency, and of course cost. This book covers the design trade-offs involved in LED driving applications, from low-power, to UB-LEDs and beyond. Provides a practical, hands-on approach to power supply design for LED drivers Contains detailed examples of what works throughout the design process Presents commentary on how the calculated component value compares with the actual value used, including a description of why the choice was made

Solid State Lighting Reliability Part 2

Solid State Lighting Reliability Part 2 Book
Author : Willem Dirk van Driel,Xuejun Fan,Guo Qi Zhang
Publisher : Springer
Release : 2017-08-13
ISBN : 3319581759
Language : En, Es, Fr & De

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Book Description :

In the past four years we have witnessed rapid development in technology and significant market penetration in many applications for LED systems. New processes and new materials have been introduced; new standards and new testing methods have been developed; new driver, control and sensing technologies have been integrated; and new and unknown failure modes have also been presented. In this book, Solid State Lighting Reliability Part 2, we invited the experts from industry and academia to present the latest developments and findings in the LED system reliability arena. Topics in this book cover the early failures and critical steps in LED manufacturing; advances in reliability testing and standards; quality of colour and colour stability; degradation of optical materials and the associated chromaticity maintenance; characterization of thermal interfaces; LED solder joint testing and prediction; common failure modes in LED drivers; root causes for lumen depreciation; corrosion sensitivity of LED packages; reliability management for automotive LEDs, and lightning effects on LEDs. This book is a continuation of Solid State Lighting Reliability: Components to Systems (published in 2013), which covers reliability aspects ranging from the LED to the total luminaire or system of luminaires. Together, these two books are a full set of reference books for Solid State Lighting reliability from the performance of the (sub-) components to the total system, regardless its complexity.

Phasor Power Electronics

Phasor Power Electronics Book
Author : Chun T. Rim
Publisher : Springer
Release : 2016-03-29
ISBN : 9811005362
Language : En, Es, Fr & De

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Book Description :

This book presents a comprehensive introduction to the principles of power electronics, focusing on the switched transformer concept and phasor transformation techniques as employed in the analysis and design of power electronic circuits. Phasor transformations, as introduced in this book, make the time-varying nature of a switching converter simple and easy to handle, transforming it into an equivalent time-invariant circuit. The book starts with an introduction to the philosophy and fundamental principles of power electronics. The switched transformer concept, which is applicable to any switching converter, is introduced, and it is shown how DC-DC converters analyses are then so straightforward that very little equational manipulation is needed. Then the phasor transformation techniques are comprehensively explained over three parts. Single phase and multi-phase AC systems are dealt with through the single phase phasor transformation and circuit DQ transformation, respectively. A general unified phasor transformation is then introduced for the static and dynamic cases. The final part of the book considers current and potential extensions of the technique in various fields of application, including wireless power transfer, signal processing, power systems and renewable energy. The book avoids the piece-wise linear circuit models used in other titles, with which the mathematical results become too complicated to be used in practice. No cumbersome equations or matrix manipulations are needed with the phasor transformation techniques introduced in this book. It will be a valuable reference source for engineering students and practising researchers in power electronics and related areas.

Led Lighting and Drivers

Led Lighting and Drivers Book
Author : J Marcos Alonso
Publisher :
Release : 2019-11-27
ISBN : 9781709429163
Language : En, Es, Fr & De

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Book Description :

The book is organized in four chapters. Chapter 1 deals with an introduction to light and lighting. As a power electronics engineer working on LEDs and lighting systems in general, I think it is important for the reader to have the basic knowledge about lighting systems, which I have tried to summarize in this chapter. Because of the extremely interesting possibilities of LEDs to generate different light colors, Chapter 1 includes a section related to the understanding of color quantification and measurement in different color spaces. The Chapter also includes several examples on light and color calculations.In order to develop and implement a suitable LED driver, it is necessary to have a good knowledge about LED behavior and characteristics. Thus, Chapter 2 aims at providing the reader with the most important issues related to LED operation and modeling from a practical point of view. The most common LED structures and materials are presented in this chapter together with the most relevant electrical, thermal and optical characteristics, making special emphasis on those characteristics provided by LED manufacturers in their datasheets. Special sections are dedicated to light dimming and color mixing. The chapter is closed with a brief review of organic LED (OLED) technology, which is another promising LED technology nowadays.Chapter 3 is devoted to DC LED drivers, which are those LED drivers intended to supply the LED from a DC voltage source, like a battery or a DC bus. This chapter covers the three most relevant technologies that are being used to implement DC LED drivers at the present time, which are those based on linear regulators, switched capacitor regulators and switching regulators. The most relevant solutions to implement DC LED drivers are reviewed from a practical point of view. The chapter also reviews the most common control methods applied to DC LED drivers. Examples are included by means of computer simulations based on LTspice, which is a free but powerful SPICE-based simulation software developed by former Linear Technologies Company, now part of Analog Devices. The chapter ends with a section devoted to LED configurations, namely, series, parallel and matrix configurations, which are employed to implement high-power LED lamps.Finally, Chapter 4 is dedicated to off-line LED drivers. This is the denomination given to LED drivers that are intended to operate from an AC grid voltage. These are the most complicated LED drivers since they usually require the implementation of a front-end power-factor-correction (PFC) stage followed by a downstream DC-DC converter to adapt voltage levels and provide regulated current to the LED lamp. The most important standards and regulations related to this type of LED drivers are presented at the beginning of the chapter. Then, single-stage LED drivers are studied, which can be used as a stand-alone off-line LED driver or as a first stage in a two-stage off-line LED driver. The highly-relevant problem of requiring a large storage capacitance in single-stage off-line LED drivers to cope with the double-line-frequency pulsating power originated from line voltage rectification is addressed in this chapter. Finally, integrated two-stage off-line LED drivers are presented and studied as a solution to reduce the storage capacitance of off-line LED drivers, aiming at using high-reliability film-capacitors instead of less reliable electrolytic capacitors. LTspice simulation examples are also provided in this chapter to allow the reader to have a better idea about the design and operation of this type of LED drivers.

LED Lighting

LED Lighting Book
Author : Sal Cangeloso
Publisher : "O'Reilly Media, Inc."
Release : 2012
ISBN : 1449334768
Language : En, Es, Fr & De

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Book Description :

With this practical guide, you will go behind the scenes to see how and why manufacturers are now designing LED devices to light everything from homes and offices to streets and warehouses. You will be shown the working parts of a simple LED bulb and explains the challenges electronics companies face as they push LED lighting into the mainstream --

Linear Integrated Circuits

Linear Integrated Circuits Book
Author : U.A.Bakshi,A.P.Godse
Publisher : Technical Publications
Release : 2009
ISBN : 9788184316759
Language : En, Es, Fr & De

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Book Description :

Practical Lighting Design with LEDs

Practical Lighting Design with LEDs Book
Author : Ron Lenk,Carol Lenk
Publisher : John Wiley & Sons
Release : 2017-03-10
ISBN : 1119165326
Language : En, Es, Fr & De

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Book Description :

The essential how-to guide to designing and building LED systems, revised and updated The second edition of Practical Lighting Design with LEDs has been revised and updated to provide the most current information for developing light-emitting diodes products. The authors, noted authorities in the field, offer a review of the most relevant topics including optical performance, materials, thermal design and modeling and measurement. Comprehensive in scope, the text covers all the information needed to design LEDs into end products. The user-friendly text also contains numerous drawings and schematics that show how things such as measurements are actually made, and show how circuits actually work. Designed to be practical, the text includes myriad notes and illustrative examples that give pointers and how-to guides on many of the book's topics. In addition, the book’s equations are used only for practical calculations, and are kept at the level of high-school algebra. This thoroughly expanded second edition offers: New chapters on the design of an LED flashlight, USB light, automotive taillight, and LED light bulbs A practical and user-friendly guide with dozens of new illustrations The nitty-gritty, day-to-day engineering and systems used to design and build complete LED systems An essential resource on the cutting-edge technology of Light-Emitting Diodes Practical Lighting Design with LEDs helps engineers and managers meet the demand for the surge in usage for products using light-emitting diodes with a practical guide that takes them through the relevant fields of light, electronic and thermal design.

Charge Pump Circuit Design

Charge Pump Circuit Design Book
Author : Feng Pan,Tapan Samaddar
Publisher : McGraw Hill Professional
Release : 2006-07-19
ISBN : 007147045X
Language : En, Es, Fr & De

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Book Description :

Charge pumps are finding increased attention and diversified usage in the new era of nanometer-generation chips used in different systems. This book explains the different architectures and requirements for an efficient charge pump design and explains each step in detail. It's filled with extra hands-on design information, potential pitfalls to avoid, and practical ideas harnessed from the authors' extensive experience designing charge pumps.

Topics on Light emitting diode Driver Research

Topics on Light emitting diode Driver Research Book
Author : Jaber Hasan
Publisher :
Release : 2012
ISBN : 9781267805553
Language : En, Es, Fr & De

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Book Description :

In this dissertation, light-emitting-diode (LED) drivers are investigated for efficiency issues related to driving Red-Green-Blue (RGB) pixels and multiple LED strings in parallel. A high-efficiency digitally controlled RGB LED driver was designed for driving a 3x3 RGB LED display panel. A multiplexer was used to sense the voltage drop across the current controllers. This driver maintained a minimum drive voltage across the RGB LED pixels required to keep it in regulation leading to a reduction of unwanted power losses in the RGB LED pixels by selecting the minimum drop across the current-controllers as the reference voltage of the digital controller. Additionally, analog dimming was implemented to dim each individual LED in a 3x3 RGB LED display panel. Efficiencies of 85.6 %, 93.3 %, and 91.1 % were experimentally obtained for red, green, and blue LEDs, respectively at the rated output current. For comparison, efficiencies of 38.3% for the red LED, 66.2 % for the green LED, and 64.5 % for the blue LED at the nominal current of 20mA using a 5 V supply were achieved in conventional LED drivers. For parallel connected LED strings, a current controller is required for each string to maintain the desired current with the drive voltage provided by a switch-mode power converter (SMPC). A novel analog/digital LED driver controller was designed for driving a two-string LED load with three white LEDs in each string for backlight application in liquid-crystal-displays (LCDs). In this implementation, an analog controller was used to control the output voltage of the SMPC while a digital controller was used to achieve the minimum drive voltage across the output LED strings, leading to an efficiency of 89 % at the rated output current. A phase shifted pulse width modulation (PSPWM) dimming was implemented to reduce load stresses, improve electromagnetic-interferences (EMI) and increase system efficiency. A mathematical model, based on multirate simulation technique, for merging the analog and digital controllers was proposed. Finally, a LED driver chip was designed and fabricated using a 0.5 micron CMOS process to reduce size of the overall LED driver system. The integrated circuit consisted of a 16-channel analog multiplexers, five current controllers, and buffer circuits. The LED driver chip function was experimentally verified using a SMPC to drive a five-string LED load in parallel with a single green LED in each string for display panel applications by maintaining a minimum drive voltage across the LED strings, thus leading to an efficiency of 75 % at the rated output current.