2010 12 28 Quasiresonant Converters Design Example Power

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2010. 12. 28 Quasi-resonant Converters & Design Example Power Supply Cook. Book (2 nd)

2010. 12. 28 Quasi-resonant Converters & Design Example Power Supply Cook. Book (2 nd) – Marty Brown 윤자웅 Bio. Medical Instrumentation Lab. , BME, Yonsei

Contents 1. Quasi-resonant Converters - Introduction of the Quasi-resonant Converter - ZCS Quasi-resonant Converter

Contents 1. Quasi-resonant Converters - Introduction of the Quasi-resonant Converter - ZCS Quasi-resonant Converter - ZVS Quasi-resonant Converter 2. The Design Example - 10 W Synchronous Buck Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Introduction of the Quasi-resonant converters • Purpose : Reduction & Elimination Switching loss in

Introduction of the Quasi-resonant converters • Purpose : Reduction & Elimination Switching loss in P. S • Resonant tank circuit • Disadvantage : Voltage & Current Stresses on Power Components More RFI/EMI noise • Design time & Product Cost = Very high Not Recommended !!! Bio. Medical Instrumentation Lab. , BME, Yonsei

ZCS Quasi-resonant Converter • Zero Current Switching quasi-resonant Switching Power Supply (ZCS QR SMSP)

ZCS Quasi-resonant Converter • Zero Current Switching quasi-resonant Switching Power Supply (ZCS QR SMSP) • Always switched when the Current is Zero • Type L, Type M Bio. Medical Instrumentation Lab. , BME, Yonsei

ZCS Quasi-resonant Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

ZCS Quasi-resonant Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

ZCS Quasi-resonant Converter – Mode 2 • 0 ~ t 2 까지의 동작 •

ZCS Quasi-resonant Converter – Mode 2 • 0 ~ t 2 까지의 동작 • 스위치 SW 는 ON 상태로 남아있으나 다이오드 Dc 는 OFF 된다. • IL = Im*sin(wt) + Io 로 주어진다. • 이때 피크 전류는 Ip = Im + Io • 피크 전압 Vc(pk) = 2 Vs • t 2 = Bio. Medical Instrumentation Lab. , BME, Yonsei

ZCS Quasi-resonant Converter – Mode 3 • 0 ~ t 3 까지의 동작 •

ZCS Quasi-resonant Converter – Mode 3 • 0 ~ t 3 까지의 동작 • IL = Io - Im*sin(wt) 로 주어진다. • Vc(pk) = 2 Vs * cos(wt) • Bio. Medical Instrumentation Lab. , BME, Yonsei

ZCS Quasi-resonant Converter – Mode 4 • 0 ~ t 4 까지의 동작 •

ZCS Quasi-resonant Converter – Mode 4 • 0 ~ t 4 까지의 동작 • Vc = V(c 3) – (Io/C)*t • t 4 = V(c 3) * C/Io Bio. Medical Instrumentation Lab. , BME, Yonsei

ZCS Quasi-resonant Converter – Mode 5 • 0 ~ t 5 까지의 동작 •

ZCS Quasi-resonant Converter – Mode 5 • 0 ~ t 5 까지의 동작 • t 5 = T – (t 1 + t 2 + t 3 + t 4) Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter • Zero Voltage Switching quasi-resonant Switching Power Supply (ZCS QR SMSP)

ZVS Quasi-resonant Converter • Zero Voltage Switching quasi-resonant Switching Power Supply (ZCS QR SMSP) • Always switched when the Voltage is Zero Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter – Mode 1 • 0 ~ t 1 까지의 동작 •

ZVS Quasi-resonant Converter – Mode 1 • 0 ~ t 1 까지의 동작 • 스위치 S 1 , 다이오드 Dm 모두 OFF • Vc = (Io/C) * t • 이 모드는 Vc = Vs 일 때 끝나게 된다. • 즉 t = t 1 이고, t 1 = Vs*C/I Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter – Mode 2 • 0 ~ t 2 까지의 동작 •

ZVS Quasi-resonant Converter – Mode 2 • 0 ~ t 2 까지의 동작 • 스위치 S 1은 OFF 상태로 남아있고, 다이오드 Dm 은 ON • Vc = Vm*sin(wt) + Vs 로 주어진다. • 이때 피크 스위치 전압은 • 인덕터 전류 IL = Io * cos(wt) • t 2 = Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter – Mode 3 • 0 ~ t 3 까지의 동작 •

ZVS Quasi-resonant Converter – Mode 3 • 0 ~ t 3 까지의 동작 • Vc = Vs – Vm*sin(wt) • IL = - Io * cos(wt) • Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter – Mode 4 • 0 ~ t 4 까지의 동작 •

ZVS Quasi-resonant Converter – Mode 4 • 0 ~ t 4 까지의 동작 • 스위치 S 1 -> On, 다이오드 Dm 은 On 상태 유지 • IL = IL 3 + (Vs/L) * t • t 4 = (Io – IL 3) / ( L/Vs ) Bio. Medical Instrumentation Lab. , BME, Yonsei

ZVS Quasi-resonant Converter – Mode 5 • 0 ~ t 5 까지의 동작 •

ZVS Quasi-resonant Converter – Mode 5 • 0 ~ t 5 까지의 동작 • t 5 = T – (t 1 + t 2 + t 3 + t 4) Bio. Medical Instrumentation Lab. , BME, Yonsei

Quasi-resonant Switching Power Supply Topologies Bio. Medical Instrumentation Lab. , BME, Yonsei

Quasi-resonant Switching Power Supply Topologies Bio. Medical Instrumentation Lab. , BME, Yonsei

The Design Example – 10 W Synchronous Buck Converter Bio. Medical Instrumentation Lab. ,

The Design Example – 10 W Synchronous Buck Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

The Design Example – 10 W Synchronous Buck Converter Bio. Medical Instrumentation Lab. ,

The Design Example – 10 W Synchronous Buck Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

The Design Example – 10 W Synchronous Buck Converter Bio. Medical Instrumentation Lab. ,

The Design Example – 10 W Synchronous Buck Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Epilogue – Q&A Thank you for your attention ! Bio. Medical Instrumentation Lab. ,

Epilogue – Q&A Thank you for your attention ! Bio. Medical Instrumentation Lab. , BME, Yonsei

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