Ch3slides

Ch3slides - Fundamentals of Power Electronics Chapter 3:...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Fundamentals of Power Electronics Chapter 3: Steady-state equivalent circuit modeling, ... 1 Chapter 3. Steady-State Equivalent Circuit Modeling, Losses, and Efficiency 3.1. The dc transformer model 3.2. Inclusion of inductor copper loss 3.3. Construction of equivalent circuit model 3.4. How to obtain the input port of the model 3.5. Example: inclusion of semiconductor conduction losses in the boost converter model 3.6. Summary of key points Fundamentals of Power Electronics Chapter 3: Steady-state equivalent circuit modeling, ... 2 3.1. The dc transformer model Basic equations of an ideal dc-dc converter: P in = P out V g I g = V I ( η = 100%) V = M ( D ) V g (ideal conversion ratio) I g = M ( D ) I These equations are valid in steady-state. During transients, energy storage within filter elements may cause P in ≠ P out Switching dc-dc converter D Control input Power input Power output I g I + V – + V g – Fundamentals of Power Electronics Chapter 3: Steady-state equivalent circuit modeling, ... 3 Equivalent circuits corresponding to ideal dc-dc converter equations P in = P out V g I g = V I V = M ( D ) V g I g = M ( D ) I Dependent sources DC transformer Power output + V – I + – M ( D ) V g Power input + V g – I g M ( D ) I D Control input Power input Power output + V – + V g – I g I 1 : M ( D ) Fundamentals of Power Electronics Chapter 3: Steady-state equivalent circuit modeling, ... 4 The DC transformer model Models basic properties of ideal dc-dc converter: • c onversion of dc voltages and currents, ideally with 100% efficiency • c onversion ratio M controllable via duty cycle • S olid line denotes ideal transformer model, capable of passing dc voltages and currents • T ime-invariant model (no switching) which can be solved to find dc components of converter waveforms D Control input Power input Power output + V – + V g – I g I 1 : M ( D ) Fundamentals of Power Electronics Chapter 3: Steady-state equivalent circuit modeling, ... 5 Example: use of the DC transformer model 1. Original system 2. Insert dc transformer model 3. Push source through transformer 4. Solve circuit V = M ( D ) V 1 R R + M 2 ( D ) R 1 D R V 1 R 1 + – + V g – + V – Switching dc-dc converter 1 : M ( D ) R V 1 R 1 + – + V g – + V – R M ( D ) V 1 M 2 ( D ) R 1 + – + V – Fundamentals of Power Electronics Chapter 3: Steady-state equivalent circuit modeling, ... 6 3.2. Inclusion of inductor copper loss Dc transformer model can be extended, to include converter nonidealities. Example: inductor copper loss (resistance of winding): Insert this inductor model into boost converter circuit: L R L L + – C R + v – 1 2 i V g R L Fundamentals of Power Electronics Chapter 3: Steady-state equivalent circuit modeling, ......
View Full Document

This note was uploaded on 07/15/2011 for the course EEL 4244 taught by Professor Lee during the Spring '09 term at FSU.

Page1 / 33

Ch3slides - Fundamentals of Power Electronics Chapter 3:...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online