2010 12 28 Switching Mode Power Supplies SMPS

2010. 12. 28 Switching Mode Power Supplies (SMPS) Power Supply Cook. Book (2 nd) – Marty Brown 윤자웅 Bio. Medical Instrumentation Lab. , BME, Yonsei

Contents 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 Bio. Medical Instrumentation Lab. , BME, Yonsei

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

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

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. Bio. Medical Instrumentation Lab. , BME, Yonsei

The Building – Block Approach - Functional Block Diagram Bio. Medical Instrumentation Lab. , BME, Yonsei

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 Bio. Medical Instrumentation Lab. , BME, Yonsei

Which Topology? - Comparison of PWM SMPS Topologies 500 Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies § Buck Converter § Boost Converter § Buck-Boost Converter § Fly-Back Converter § 1 T Forward Converter § Push – Pull Converter § Half Bridge Converter § Full Bridge Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies - Buck (Step Down) Converter Buck : 날뛰다 , 걷 잡을수 없다 Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies - Boost (Step up) Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies : Buck-Boost Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies : Fly-Back Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies : 1 T – Forward Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies : Push-Pull Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies : Half-Bridge Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

Topologies : Full-Bridge Converter Bio. Medical Instrumentation Lab. , BME, Yonsei

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

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) Bio. Medical Instrumentation Lab. , BME, Yonsei

(*1) Selection the Power Switches and Rectifiers Bio. Medical Instrumentation Lab. , BME, Yonsei

(*2) Estimation Component (Optional) Bio. Medical Instrumentation Lab. , BME, Yonsei

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