Power Supplies for LED Driving

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Newnes, Apr 8, 2011 - Technology & Engineering - 248 pages
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Light-emitting diodes are being widely used due to their efficient use of power. The applications for power LEDs include traffic lights, street lamps, automotive lighting, architectural lights, household light replacements, signage lighting (replacing neon strip lights and fluorescent tubes), 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 and efficiency, and of course cost. The problem is to get a design that meets legal requirements and is efficient, while costing the least. This book covers the design trade-offs involved in LED driving applications, from low-power to UB-LEDs and beyond.

* Practical, "hands-on" approach to power supply design for LED drivers
* Detailed examples of what works and why, throughout the design process
* Commentary on how the calculated component value compares with the actual value used, including a description of why the choice was made
 

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Contents

Introduction
1
Characteristics of LEDs
7
Driving LEDs
17
Linear Power Supplies
33
BuckBased LED Drivers
39
Boost Converters
61
BoostBuck Converter
99
LED Drivers with Power Factor Correction
141
Selecting Components for LED Drivers
175
Magnetic Materials for Inductors and Transformers
195
EMI and EMC Issues
203
Thermal Considerations
217
Safety Issues
225
Bibliography
229
Index
231
Author Biography
233

FlyBack Converters
149
Essentials of Switching Power Supplies
161

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Page 229 - Montrose, Mark I., 2000. Printed Circuit Board Design Techniques for EMC Compliance, Second Edition, IEEE Press.

About the author (2011)

Steve Winder is now a European Field Applications Engineer for Intersil Inc. Steve works alongside design engineers throughout Europe to design circuits using components made by Intersil Inc, a US based manufacturer of CMOS ICs used for power supply controllers and for analogue signal processing.

Prior to joining Intersil Inc., Steve worked for US based Supertex Inc. in 2002, where he was instrumental in encouraging Supertex’s management to start developing LED drivers. One of Steve’s German customers had started using a relay driver for LEDs and once Steve had explained the technical detail of this application to Supertex’s management, they decided to start an applications team to develop LED specific products. Supertex then invested heavily to became a leader in this field. Microchip acquired Supertex in 2014.

Until 2002, Steve was for many years a team leader at British Telecom Research Laboratories, based at Martlesham Heath, Ipswich in the UK. Here he designed analog circuits for wideband transmission systems, mostly high frequency, and designed many active and passive filters.

Steve has studied electronics and related topics since 1973, receiving an Ordinary National Certificate (ONC) in 1975 and Higher National Certificate (HNC) in 1977 with Endorsements in 1978. He studied Mathematics and Physics part time with the Open University for 10 years, receiving a Bachelor of Arts Degree with 1st Class Honours in 1989. He received a Master’s Degree in 1991, in Telecommunications and Information Systems after studying at Essex University. Since 1991, he has continued with self-study of electronics, to keep up-to-date with new innovations and developments.

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