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Buck Converter

Chapter 3. Buck Converter. Ideal Step-Down Dc-to-Dc Power Conversion. Step-Down Dc-to-Dc Power Conversion. Frequency-Domain Interpretation. Step-Down Dc-to-Dc Power Conversion. Buck Converter: Step-Down Dc-to-Dc Converter. Step-Down Dc-to-Dc Power Conversion. Buck Converter.

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Buck Converter

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  1. Chapter 3 Buck Converter

  2. Ideal Step-Down Dc-to-Dc Power Conversion Step-Down Dc-to-Dc Power Conversion

  3. Frequency-Domain Interpretation Step-Down Dc-to-Dc Power Conversion

  4. Buck Converter: Step-Down Dc-to-Dc Converter Step-Down Dc-to-Dc Power Conversion

  5. Buck Converter Buck Converter

  6. Frequency - Domain Analysis Buck Converter

  7. Example: Prototype Buck Converter Prototype Buck Converter

  8. Example: Prototype Buck Converter Prototype Buck Converter

  9. Piecewise Linear Analysis Piecewise Linear Analysis

  10. Start-up Response of Buck Converter Piecewise Linear Analysis

  11. Example: PrototypeBuck Converter BuckConverter in Start-up Transient

  12. Buck Converter in Steady State Equilibrium • Assumption and Conditions • - Small-ripple approximation: the ripple component in the • output of a converter is so small that the output can • be considered as a pure dc : • - Volt-sec balance condition: the average value of the inductor • voltage over one switching period is zero. • - Amp-sec balance condition: the average value of the capacitor • current over one switching period is zero. BuckConverter in Steady State

  13. Buck Converter in Steady State BuckConverter in Steady State

  14. Buck Converter in State State BuckConverter in Steady State

  15. Prototype Buck Converter BuckConverter in Steady State

  16. Estimation of Output Voltage Ripple BuckConverter in Steady State

  17. Prototype Buck Converter BuckConverter in Steady State

  18. Effect of Capacitor Parasitic Resistance Effects of Capacitor esr

  19. Prototype Buck Converter Effects of Capacitor esr

  20. DCM Operation of Buck Converter Discontinuous Conduction Mode

  21. Condition for DCM Operation Discontinuous Conduction Mode

  22. Prototype Buck Converter Discontinuous Conduction Mode

  23. Prototype Buck Converter Discontinuous Conduction Mode

  24. Steady-State Analysis in DCM Discontinuous Conduction Mode

  25. Prototype Buck Converter Discontinuous Conduction Mode

  26. Observations • DCM voltage gain: Discontinuous Conduction Mode

  27. Observations Discontinuous Conduction Mode • When , the converter remains in CCM • for

  28. Pulse-width Modulation Closed-Loop Control

  29. Open-loop Operation Closed-Loop Control

  30. Closed-loop Control of Buck Converter Closed-Loop Control

  31. Closed-Loop Operation Closed-Loop Control

  32. Voltage Feedback Circuits Closed-Loop Control

  33. Buck Converter Example Closed-Loop Control

  34. Steady-State Analysis with VS=16 V, R =1Ω • Steady-state analysis • PWM waveforms Closed-Loop Control

  35. Step Input Change Response Closed-Loop Control

  36. Step Load Change Response Closed-Loop Control

  37. Step Load Change Response Closed-Loop Control

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