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Published byAiden Custard Modified about 1 year ago

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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 to the amplitude of a sine wave evaluated at the center of the same pulse

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

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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

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ECE 442 Power Electronics4 Comparing the carrier and reference signals

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

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

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ECE 442 Power Electronics7 This composite signal is difficult to generate

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

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ECE 442 Power Electronics9 Alternate scheme

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

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ECE 442 Power Electronics11 Fourier coefficients of the output voltage

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ECE 442 Power Electronics12 Harmonic Profile

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

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