Power Supplies for LED Driving, 2nd Edition

Chapter 9

Fly-Back Converters and Isolated PFC Circuits

Abstract

This chapter discusses fly-back and isolated power factor correction circuits. Single-, double-, and triple-winding inductor/transformer types are discussed. There is some discussion about transformer design, although the detail of these is in later chapters.

Keywords

isolation

fly-back

power factor

PFC

power factor correction

transformer

Chapter Outline

9.1 Single-Winding Fly-Back (Buck–Boost) 

9.2 Two-Winding Fly-Back 

9.2.1 Fly-Back Example 

9.3 Three-Winding Fly-Back 

9.3.1 Design Rules for a Fly-Back Converter 

9.3.2 Case 1: Turns Ratio Based on Maximum Duty Cycle 

9.3.3 Case 2: Turns Ratio Based on Maximum Switch Voltage 

9.3.4 Inductance Calculations 

9.4 Three-Winding Fly-Back ...