1. BioMedical Instrumentation Lab., BME, Yonsei University 윤 자 웅윤 자 웅 2010. 12. 28 Switching Mode Power Supplies (SMPS) Power Supply CookBook (2 nd ) – Marty Brown

2. Contents BioMedical Instrumentation Lab., BME, Yonsei University 1.Introduction of PWM SMPS 2.The Fundamentals of PWM SMPS 3.The Building – Block Approach 4.Topologies of SMPS 5.“Black-Box”test Method

3. Intro. SMPS BioMedical Instrumentation Lab., BME, Yonsei University Pulse Width Modulated (PWM) Power Supplies have been around for a long time. However, it used from mid-1970s broadly. Advantages : i) Smaller in Size ii) More Efficient Disadvantages : i) More difficult to Design ii) Radiate more Electromagnetic Interference (EMI)

4. The Fundamentals. BioMedical Instrumentation Lab., BME, Yonsei University Saturation & Cutoff in Power TRs. : ㅣ i) Low-V / High-I ii) High-V / Low-I “Chopping”&“Duty Ratio” Two Major Type of SMPS 1) Forward-Mode Convertor 2) Boost-Mode Convertor

5. The Building – Block Approach - Design Flow BioMedical Instrumentation Lab., BME, Yonsei University First, Produce a very good “Paper Design” If you have a good library book or Data Sheet, it will be done within 8 Working hours.

6. The Building – Block Approach - Functional Block Diagram BioMedical Instrumentation Lab., BME, Yonsei University

7. Which Topology? BioMedical Instrumentation Lab., BME, Yonsei University  What is the Topology?  A Major decision is Which basic Topology to Use!  Each Topology has its relative merit.  The best choice provides the best performance at the needed cost

8. Which Topology? - Comparison of PWM SMPS Topologies BioMedical Instrumentation Lab., BME, Yonsei University 500

9. Topologies BioMedical Instrumentation Lab., BME, Yonsei University  Buck Converter  Boost Converter  Buck-Boost Converter  Fly-Back Converter  1T Forward Converter  Push – Pull Converter  Half Bridge Converter  Full Bridge Converter

10. Topologies - Buck (Step Down) Converter BioMedical Instrumentation Lab., BME, Yonsei University Buck : 날뛰다, 걷 잡을수 없다

11. Topologies - Boost (Step up) Converter BioMedical Instrumentation Lab., BME, Yonsei University

12. Topologies : Buck-Boost Converter BioMedical Instrumentation Lab., BME, Yonsei University

13. Topologies : Fly-Back Converter BioMedical Instrumentation Lab., BME, Yonsei University

14. Topologies : 1T – Forward Converter BioMedical Instrumentation Lab., BME, Yonsei University

15. Topologies : Push-Pull Converter BioMedical Instrumentation Lab., BME, Yonsei University

16. Topologies : Half-Bridge Converter BioMedical Instrumentation Lab., BME, Yonsei University

17. Topologies : Full-Bridge Converter BioMedical Instrumentation Lab., BME, Yonsei University

18. The “Black-Box”Considerations BioMedical Instrumentation Lab., BME, Yonsei University  What is the “Black-Block”test ?  This allows the designer to determine whether the choice of topology is correct

19. The “Black-Block”Considerations - Sequence BioMedical Instrumentation Lab., BME, Yonsei University 1.Output Power : 2.Input Power : 3.Average Input Currents : 4.Input Peak Current ; 5.Selection the Power Switches and Rectifiers (*1) 6.Estimation Component (Optional) (*2)

20. (*1) Selection the Power Switches and Rectifiers BioMedical Instrumentation Lab., BME, Yonsei University

21. (*2) Estimation Component (Optional) BioMedical Instrumentation Lab., BME, Yonsei University

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