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2010. 12. 28. Switching Mode Power Supplies (SMPS). Power Supply CookBook (2 nd ) – Marty Brown. 윤 자 웅. BioMedical Instrumentation Lab., BME, Yonsei University . Contents. Introduction of PWM SMPS The Fundamentals of PWM SMPS The Building – Block Approach Topologies of SMPS

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2010. 12. 28

Switching Mode

Power Supplies (SMPS)

Power Supply CookBook (2nd) – Marty Brown

윤 자 웅

BioMedical Instrumentation Lab., BME, Yonsei University


Contents

  • Introduction of PWM SMPS

  • The Fundamentals of PWM SMPS

  • The Building – Block Approach

  • Topologies of SMPS

  • “Black-Box”test Method

BioMedical Instrumentation Lab., BME, Yonsei University


Intro. SMPS

  • 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)

BioMedical Instrumentation Lab., BME, Yonsei University


The Fundamentals.

  • Saturation & Cutoff in Power TRs.

    :ㅣi) 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

BioMedical Instrumentation Lab., BME, Yonsei University


The Building – Block Approach - Design Flow

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.

BioMedical Instrumentation Lab., BME, Yonsei University


The Building – Block Approach - Functional Block Diagram

BioMedical Instrumentation Lab., BME, Yonsei University


Which Topology?

  • 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

BioMedical Instrumentation Lab., BME, Yonsei University


Which Topology? - Comparison of PWM SMPS Topologies

500

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies

  • Buck Converter

  • Boost Converter

  • Buck-Boost Converter

  • Fly-Back Converter

  • 1T Forward Converter

  • Push – Pull Converter

  • Half Bridge Converter

  • Full Bridge Converter

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies - Buck (Step Down) Converter

Buck : 날뛰다 , 걷잡을수 없다

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies - Boost (Step up) Converter

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies : Buck-Boost Converter

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies : Fly-Back Converter

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies : 1T – Forward Converter

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies : Push-Pull Converter

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies : Half-Bridge Converter

BioMedical Instrumentation Lab., BME, Yonsei University


Topologies : Full-Bridge Converter

BioMedical Instrumentation Lab., BME, Yonsei University


The “Black-Box”Considerations

  • What is the “Black-Block”test ?

  • This allows the designer to determine whether

    the choice of topology is correct

BioMedical Instrumentation Lab., BME, Yonsei University


The “Black-Block”Considerations - Sequence

  • Output Power :

  • Input Power :

  • Average Input Currents :

  • Input Peak Current ;

  • Selection the Power Switches and Rectifiers (*1)

  • Estimation Component (Optional) (*2)

BioMedical Instrumentation Lab., BME, Yonsei University


(*1)Selection the Power Switches and Rectifiers

BioMedical Instrumentation Lab., BME, Yonsei University


(*2) Estimation Component (Optional)

BioMedical Instrumentation Lab., BME, Yonsei University


Epilogue – Q&A

Thank you for your attention !

BioMedical Instrumentation Lab., BME, Yonsei University


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