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Three-Phase Inverters

Three-Phase Inverters. Consider three single-phase inverters in parallel, driven 120 ° apart. Three-Phase Inverter (continued). Three single-phase full bridge inverters. 12 transistors, 12 diodes, 3 transformers Could it be simpler?. Alternative (Preferred) Configuration.

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Three-Phase Inverters

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  1. Three-Phase Inverters Consider three single-phase inverters in parallel, driven 120° apart.

  2. Three-Phase Inverter (continued) Three single-phase full bridge inverters 12 transistors, 12 diodes, 3 transformers Could it be simpler?

  3. Alternative (Preferred) Configuration 6 transistors, 6 diodes conduction for 120° or 180°

  4. 180° Conduction • Three transistors ON at a time

  5. Summary Table

  6. Waveforms for 180 Conduction

  7. Phase Voltages for 180 Conduction

  8. Waveforms for 180 Conduction

  9. Summary Table

  10. Mode 1 Operation

  11. Mode 1 Operation Q1, Q5, Q6 conduct

  12. Summary Table

  13. Mode 2 Operation

  14. Mode 2 Operation Q1, Q2, Q6 conduct

  15. Summary Table

  16. Mode 3 Operation

  17. Mode 3 Operation Q1, Q2, Q3 conduct

  18. Phase Voltages for 180 Conduction

  19. Fourier Series for Line-to-Line Voltages

  20. For the other Line-to-Line Voltages

  21. Line-to-Line rms Voltage

  22. rms value of the nth Component Fundamental Component

  23. Line-to-Neutral Voltages

  24. Phase Voltages (Y-connected load)

  25. Line Current for an RL load

  26. DC Supply Current IL=√3Io is the rms load line current Vo1= fundamental rms output line voltage Io is the rms load phase current Θ1 = the load impedance angle at the fundamental frequency

  27. Three-Phase Inverter with RL Load

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