1. DC TO AC CONVERTER Mohd Shawal Bin Jadin Faculty of Electrical & Electronic Engineering [email_address] BEE4223 Power Electronics & Drives Systems

11. WHEN S1-S2 TURN ON & S3-S4 OFF FOR T 1 < T < T 2

12. WHEN S1-S2 TURN OFF& S3-S4 ON FOR T 2 < T < T 3

13. PERFORMANCE PARAMETERS

19. EXAMPLE 2 n f n (Hz) V n (V) Z n (  ) I n (A) P n (W) 1 60 127.3 13.7 9.27 429.3 3 180 42.3 30 1.42 10 5 300 25.5 48.2 0.53 1.4 7 420 18.2 66.7 0.27 0.37 9 540 14.1 85.4 0.17 0.14

20. EXAMPLE 1 (CONT)

24. EXAMPLE 1 (CONT)

25. EXAMPLE 1 (CONT) n f n (Hz) V n (V) Z n (  ) I n (A) 1 60 127.3 13.7 9.27 3 180 0 30 0 5 300 25.5 48.2 0.53 7 420 18.2 66.7 0.27 9 540 0 85.4 0

28. PULSE WIDTH MODULATION (PWM)

33. BIPOLAR SWITCHING

34. UNIPOLAR SWITCHING

35. PULSE WIDTH MODULATION IN UNIPOLAR INVERTERS The square wave output can be produced using a comparator to compare the triangle wave with the sine wave.

39. THREE PHASE INVERTER WAVEFORMS