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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. Generate the gating signal. 2 Reference Signals, v r , -v r.

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sinusoidal pulse width modulation
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

ECE 442 Power Electronics

generate the gating signal
Generate the gating signal

2 Reference Signals, vr, -vr

ECE 442 Power Electronics

comparing the carrier and reference signals
Comparing the carrier and reference signals
  • Generate g1 signal by comparison with vr
  • Generate g4 signal by comparison with -vr

ECE 442 Power Electronics

if we prevent the problem
If we prevent the problem

Output voltage is low when g1 and g4 are both high

ECE 442 Power Electronics

alternate scheme
Alternate scheme

ECE 442 Power Electronics

rms output voltage
rms output voltage
  • Depends on the modulation index, M

Where δm is the width of the mth pulse

ECE 442 Power Electronics

harmonic profile
Harmonic Profile

ECE 442 Power Electronics

compare with multiple pulse case for p 5
Compare with multiple-pulse case for p=5

Distortion Factor is considerably less

ECE 442 Power Electronics