Все книги на сайте представлены исключительно в ознакомительных целях! Ссылки на книги взяты из открытых источников на просторах интернета. Авторам, желающим внести поправки, просим связаться с администрацией.
Название: Power Supplies for LED Driving Автор: Steve Winder Издательство: Newnes Год: 2008 Страниц: 248 Язык: Английский Формат: pdf Качество: отличное Размер: 2.42Mб
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.
Table of contents:
Preface Chapter 1: Introduction 1.1 Objectives and General Approach 1.2 Description of Contents Chapter 2: Characteristics of LEDs 2.1 Applications for LEDs 2.2 Light Measure 2.3 Equivalent Circuit to an LED 2.4 Voltage Drop Versus Color and Current 2.5 Common Mistakes Chapter 3: Driving LEDs 3.1 Voltage Source 3.2 Current Source 3.3 Testing LED Drivers 3.4 Common Mistakes 3.5 Conclusions Chapter 4: Linear Power Supplies 4.1 Introduction 4.2 Advantages and Disadvantages 4.3 Limitations 4.4 Common Errors in Designing Linear LED Drivers Chapter 5: Buck-Based LED Drivers 5.1 An Example Buck Converter Control IС 5.2 Buck Circuits for DC Applications 5.3 Buck Circuits for AC Input 5.4 Buck Circuits Powered by an AC Phase Dimmer 5.5 Common Errors in AC Input Buck Circuits 5.6 Double Buck 5.7 Hysteretic Buck Chapter 6: Boost Converters 6.1 Boost Converter Operating Modes 6.2 H V9912 Boost Controller 6.3 Design of a Continuous Conduction Mode Boost LED Driver 6.4 Design of a Discontinuous Conduction Mode Boost LED Driver 6.5 Common Mistakes 6.6 Conclusions Chapter 7: Boost-Buck Converter 7.1 The Cuk Converter 7.2 SEPIC Buck-Boost Converters 7.3 Buck-Boost Topology 7.4 Common Mistakes in Boost-Buck Circuits 7.5 Conclusions Chapter 8: LED Drivers with Power Factor Correction 8.1 Power Factor Correction 8.2 Bi-Brcd 8.3 Buck-Boost-Buck (BBB) 8.4 Common Mistakes with PFC Circuits 8.5 Conclusions Chapter 9: Fly-Back Converters 9.1 Two Winding Fly-Back 9.2 Three Winding Fly-Back 9.3 Single Winding Fly-Back (Buck-Boost) Chapter 10: Essentials of Switching Power Supplies 10.1 Linear Regulators 10.2 Switching Regulators Chapter 11: Selecting Components for LED Drivers 11.1 Discrete Semiconductors 11.2 Passive Components 11.3 The Printed Circuit Board (PCB) 11.4 Operational Amplifiers and Comparators Chapter 12: Magnetic Materials for Inductors and Transformers 12.1 Ferrite Cores 12.2 Iron Dust Cores 12.3 Special Cores 12.4 Core Shapes and Sizes 12.5 Magnetic Saturation 12.6 Copper Losses Chapter 13: EMI and EMC Issues 13.1 EMI Standards 13.2 Good EMI Design Techniques 13.3 EMC Standards 13.4 EMC Practices Chapter 14: Thermal Considerations 14.1 Efficiency and Power Loss 14.2 Calculating Temperature 14.3 Handling Heat - Cooling Techniques Chapter 15: Safety Issues 15.1 AC Mains Isolation 15.2 Circuit Breakers 15.3 Creepage Distance 15.4 Capacitor Ratings 15.5 Low Voltage Operation Bibliography Index Author Biography