biomedical instrumentation lab., bme, yonsei university

BioMedical Instrumentation Lab., BME, Yonsei University

윤 자 웅

2010. 12. 28

Switching Mode Power Supplies

(SMPS)

Power Supply CookBook (2nd) – Marty Brown

Contents


1. Introduction of PWM SMPS2. The Fundamentals of PWM SMPS3. The Building – Block Approach 4. Topologies of SMPS5. “Black-Box”test Method

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 EfficientDisadvantages : i) More difficult to Design

ii) Radiate more Electromagnetic Interfer-

ence (EMI)

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

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.

The Building – Block Approach - Functional Block Diagram


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 perfor-

mance at the needed

cost

Which Topology? - Comparison of PWM SMPS Topologies


500

Topologies


Buck Converter Boost Converter Buck-Boost Converter Fly-Back Converter 1T Forward Converter Push – Pull Converter Half Bridge Converter Full Bridge Converter

Topologies - Buck (Step Down) Converter


Buck : 날뛰다 , 걷 잡을수 없다

Topologies - Boost (Step up) Converter


Topologies : Buck-Boost Converter


Topologies : Fly-Back Converter


Topologies : 1T – Forward Converter


Topologies : Push-Pull Converter


Topologies : Half-Bridge Converter


Topologies : Full-Bridge Converter


The “Black-Box”Considerations


What is the “Black-Block”test ?

This allows the designer to determine whether the choice of topology is

correct

The “Black-Block”Considerations - Sequence


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)

(*1) Selection the Power Switches and Rectifiers


(*2) Estimation Component (Optional)


Epilogue – Q&A


Thank you for your attention !

biomedical instrumentation lab., bme, yonsei university

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