Chapter 8 Switch-Mode DC-AC Inverters - PowerPoint PPT Presentation

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Chapter 8 Switch-Mode DC-AC Inverters

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  1. Chapter 8 Switch-Mode DC-AC Inverters • converters for ac motor drives and uninterruptible power supplies Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  2. Switch-Mode DC-AC Inverter Power flow • Block diagram of a motor drive where the power flow is unidirectional Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  3. Switch-Mode DC-AC Inverter Power flow • Block diagram of a motor drive where the power flow can be bi-directional Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  4. Switch-Mode DC-AC Inverter • Four quadrants of operation Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  5. Full-Bridge DC-DC Converter Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  6. Half-bridge DC-AC Inverter • Half-bridge inverter • (One leg of full bridge converter) Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  7. Square-Wave Mode of Operation • Harmonics are of the fundamental frequency Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  8. Effect of Blanking Time • Results in nonlinearity Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  9. Effect of Blanking Time • Effect on the output voltage Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  10. Synthesis of a Sinusoidal Output by PWM Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  11. Synthesis of a Sinusoidal Output by PWM (2) 1 Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  12. Half-Bridge DC-AC Inverter • Capacitors provide the mid-point Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  13. Full-Bridge DC-AC Inverter Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  14. Full-Bridge DC-AC Inverter Bipolar Voltage switching Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  15. Full-Bridge DC-AC Inverter Unipolar Voltage Switching Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  16. Full-Bridge DC-AC Inverter Unipolar Voltage Switching 1 • Harmonic components around the switching frequency are absent Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  17. Sinusoidal Synthesis by Voltage Shift Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  18. Programmed Harmonic Elimination • Angles based on the desired output • IC circuit or microcontroller required Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters

  19. Summary of DC-AC Inverters PWM square-wave Chapter 8 Switch-Mode DC- Sinusoidal AC Inverters