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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System

High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System

TABLE OF CONTENTS

CHAPTER 1 OVERVIEW AND BACKGROUND OF RESEARCH ............................ 1 

1.1 Introduction ......................................................................................................... 1 

1.2 Light emitting diode (LED) Lamps..................................................................... 3 

1.2.1 The Principle and Characteristic of Light emitting diode (LED) Lamps . 3 

1.3 Ballasts for Light emitting diode (LED) Lamps ................................................. 7 

1.3.1 Topology and Performance Requirements of Electronic Ballast Circuit . 7 

1.3.2 A topology study of the existing LED driver. ........................................ 10 

1.4 Organization of the Thesis ................................................................................ 11 CHAPTER 2 A SINGLE PHASE SEPIC WITH VALLEY FILLED CIRCUIT FOR

LED APPLICATION ...................................................................................................... 13 

2.1 Introduction of SEPIC Converter ...................................................................... 13 

2.2 Principle of DCM Operated SEPIC converter .................................................. 18 

2.3 Proposed DCM Operated SEPIC derived converter ......................................... 19 

2.3.1 Principle of Proposed DCM Operated SEPIC derived converter .......... 19 

2.3.2 The Voltage and Current Stress of the devices and components. ........... 31 

2.4 Experimental Results ........................................................................................ 32 

2.5 Loss Distribution ............................................................................................... 36 

2.5.1 Inductor Losses ...................................................................................... 37 

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