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BioMedical Instrumentation Lab., BME, Yonsei University

2010. 12. 28. Quasi-resonant Converters & Design Example. Power Supply CookBook (2 nd ) – Marty Brown. 윤 자 웅. BioMedical Instrumentation Lab., BME, Yonsei University . Contents. Quasi-resonant Converters - Introduction of the Quasi-resonant Converter

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BioMedical Instrumentation Lab., BME, Yonsei University

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  1. 2010. 12. 28 Quasi-resonant Converters & Design Example Power Supply CookBook (2nd) – Marty Brown 윤 자 웅 BioMedical Instrumentation Lab., BME, Yonsei University

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

  3. 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 !!! BioMedical Instrumentation Lab., BME, Yonsei University

  4. 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 BioMedical Instrumentation Lab., BME, Yonsei University

  5. ZCS Quasi-resonant Converter BioMedical Instrumentation Lab., BME, Yonsei University

  6. ZCS Quasi-resonant Converter – Mode 1 • 0 ~ t1 까지의 동작 • 스위치 SW 가 턴온, 인덕터에 흐르는 전류 Isw가 선형적으로 증가 • IL = ( Vs / L ) * t • 이 모드는 IL = I0 일 때 끝나게 된다 . • 즉 t = t1이고, t1 = (I0*L) / Vs BioMedical Instrumentation Lab., BME, Yonsei University

  7. ZCS Quasi-resonant Converter – Mode 2 • 0 ~ t2 까지의 동작 • 스위치 SW 는 ON 상태로 남아있으나 다이오드 Dc 는 OFF 된다. • IL = Im*sin(wt) + Io 로주어진다. • 이때 피크 전류는 Ip = Im + Io • 피크 전압 Vc(pk) = 2Vs • t2 = BioMedical Instrumentation Lab., BME, Yonsei University

  8. ZCS Quasi-resonant Converter – Mode 3 • 0 ~ t3 까지의 동작 • IL = Io - Im*sin(wt) 로주어진다. • Vc(pk) = 2Vs * cos(wt) BioMedical Instrumentation Lab., BME, Yonsei University

  9. ZCS Quasi-resonant Converter – Mode 4 • 0 ~ t4 까지의 동작 • Vc = V(c3) – (Io/C)*t • t4 = V(c3) * C/Io BioMedical Instrumentation Lab., BME, Yonsei University

  10. ZCS Quasi-resonant Converter – Mode 5 • 0 ~ t5 까지의 동작 • t5 = T – (t1 + t2 + t3 + t4) BioMedical Instrumentation Lab., BME, Yonsei University

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

  12. ZVS Quasi-resonant Converter BioMedical Instrumentation Lab., BME, Yonsei University

  13. ZVS Quasi-resonant Converter – Mode 1 • 0 ~ t1 까지의 동작 • 스위치 S1 , 다이오드 Dm 모두 OFF • Vc = (Io/C) * t • 이 모드는 Vc = Vs일 때 끝나게 된다 . • 즉 t = t1이고, t1 = Vs*C/I BioMedical Instrumentation Lab., BME, Yonsei University

  14. ZVS Quasi-resonant Converter – Mode 2 • 0 ~ t2 까지의 동작 • 스위치 S1은 OFF 상태로 남아있고, 다이오드 Dm 은 ON • Vc = Vm*sin(wt) + Vs 로주어진다. • 이때 피크 스위치 전압은 • 인덕터 전류 IL = Io * cos(wt) • t2 = BioMedical Instrumentation Lab., BME, Yonsei University

  15. ZVS Quasi-resonant Converter – Mode 3 • 0 ~ t3 까지의 동작 • Vc = Vs – Vm*sin(wt) • IL = - Io * cos(wt) BioMedical Instrumentation Lab., BME, Yonsei University

  16. ZVS Quasi-resonant Converter – Mode 4 • 0 ~ t4 까지의 동작 • 스위치 S1 -> On, 다이오드 Dm 은 On 상태 유지 • IL = IL3 + (Vs/L) * t • t4 = (Io – IL3) / ( L/Vs ) BioMedical Instrumentation Lab., BME, Yonsei University

  17. ZVS Quasi-resonant Converter – Mode 5 • 0 ~ t5 까지의 동작 • t5 = T – (t1 + t2 + t3 + t4) BioMedical Instrumentation Lab., BME, Yonsei University

  18. Quasi-resonant Switching Power Supply Topologies BioMedical Instrumentation Lab., BME, Yonsei University

  19. The Design Example – 10W Synchronous Buck Converter BioMedical Instrumentation Lab., BME, Yonsei University

  20. The Design Example – 10W Synchronous Buck Converter BioMedical Instrumentation Lab., BME, Yonsei University

  21. The Design Example – 10W Synchronous Buck Converter BioMedical Instrumentation Lab., BME, Yonsei University

  22. Epilogue – Q&A Thank you for your attention ! BioMedical Instrumentation Lab., BME, Yonsei University

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