April 12, 2021

Download Ebook Free Power Supplies For LED Drivers

Power Supplies for LED Driving

Power Supplies for LED Driving
Author : Steve Winder
Publisher : Newnes
Release Date : 2016-12-28
Category : Technology & Engineering
Total pages :320
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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
Author : Willem Dirk van Driel,Xuejun Fan,Guo Qi Zhang
Publisher : Springer
Release Date : 2017-08-13
Category : Technology & Engineering
Total pages :606
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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.

Led Lighting and Drivers

Led Lighting and Drivers
Author : J Marcos Alonso
Publisher : Unknown
Release Date : 2019-11-27
Category :
Total pages :230
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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.

Phasor Power Electronics

Phasor Power Electronics
Author : Chun T. Rim
Publisher : Springer
Release Date : 2016-03-29
Category : Technology & Engineering
Total pages :249
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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.

Official Gazette of the United States Patent and Trademark Office

Official Gazette of the United States Patent and Trademark Office
Author : Anonim
Publisher : Unknown
Release Date : 2008
Category : Trademarks
Total pages :129
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Information Display

Information Display
Author : Anonim
Publisher : Unknown
Release Date : 2009
Category : Information display systems
Total pages :129
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Development and Validation of a Multiplex Hand-held Gene Analyzer

Development and Validation of a Multiplex Hand-held Gene Analyzer
Author : Robert D. Stedtfeld
Publisher : Unknown
Release Date : 2009
Category : Medical care
Total pages :352
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JEE, Journal of Electronic Engineering

JEE, Journal of Electronic Engineering
Author : Anonim
Publisher : Unknown
Release Date : 1991
Category : Electronics
Total pages :129
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Optoelectronics/fiber-optics Applications Manual

Optoelectronics/fiber-optics Applications Manual
Author : Hewlett-Packard Company. Optoelectronics Division. Applications Engineering Staff
Publisher : McGraw-Hill Companies
Release Date : 1981
Category : Fiber optics
Total pages :500
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Asian Sources Electronic Components

Asian Sources Electronic Components
Author : Anonim
Publisher : Unknown
Release Date : 2006
Category : Electronic apparatus and appliances
Total pages :129
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Electronics Now

Electronics Now
Author : Anonim
Publisher : Unknown
Release Date : 1992
Category : Electronics
Total pages :129
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Ham Radio Magazine

Ham Radio Magazine
Author : Anonim
Publisher : Unknown
Release Date : 1980-07
Category : Radio
Total pages :129
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Global Sources Electronic Components

Global Sources Electronic Components
Author : Anonim
Publisher : Unknown
Release Date : 2008
Category : Electronic apparatus and appliances
Total pages :129
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Electronic Design

Electronic Design
Author : Anonim
Publisher : Unknown
Release Date : 1982
Category : Electronic apparatus and appliances
Total pages :129
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Electronic Products

Electronic Products
Author : Anonim
Publisher : Unknown
Release Date : 1976
Category : Electronic apparatus and appliances
Total pages :129
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