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ECE 442 Power Electronics1 Sinusoidal Pulse-Width Modulation In multiple-pulse modulation, all pulses are the same width Vary the pulse width according.

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Presentation on theme: "ECE 442 Power Electronics1 Sinusoidal Pulse-Width Modulation In multiple-pulse modulation, all pulses are the same width Vary the pulse width according."— Presentation transcript:

1 ECE 442 Power Electronics1 Sinusoidal Pulse-Width Modulation In multiple-pulse modulation, all pulses are the same width Vary the pulse width according to the amplitude of a sine wave evaluated at the center of the same pulse

2 ECE 442 Power Electronics2 Generate the gating signal 2 Reference Signals, v r, -v r

3 ECE 442 Power Electronics3 Comparing the carrier and reference signals Generate g 1 signal by comparison with v r Generate g 4 signal by comparison with -v r

4 ECE 442 Power Electronics4 Comparing the carrier and reference signals

5 ECE 442 Power Electronics5 Potential problem if Q 1 and Q 4 try to turn ON at the same time!

6 ECE 442 Power Electronics6 If we prevent the problem Output voltage is low when g 1 and g 4 are both high

7 ECE 442 Power Electronics7 This composite signal is difficult to generate

8 ECE 442 Power Electronics8 Generate the same gate pulses with one sine wave

9 ECE 442 Power Electronics9 Alternate scheme

10 ECE 442 Power Electronics10 rms output voltage Depends on the modulation index, M Where δ m is the width of the mth pulse

11 ECE 442 Power Electronics11 Fourier coefficients of the output voltage

12 ECE 442 Power Electronics12 Harmonic Profile

13 ECE 442 Power Electronics13 Compare with multiple-pulse case for p=5 Distortion Factor is considerably less


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