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In a single-pulse modulation of PWM inverters if pulse width is 120° then
  • a)
    5th harmonic will be eliminated
  • b)
    3rd harmonic will be eliminated
  • c)
    7th harmonic will be eliminated
  • d)
    none of the above
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
In a single-pulse modulation of PWM inverters if pulse width is 120&de...
The rms value of amplitude of harmonic voltage of a single, pulse modulated wave is given by

(where, p = width of pulse an Vdc = supply dc voltage)
If the 3rd harmonic Is to be eliminated, then
EL3 = 0
i.e. 
or, 
or, 
= Required pulse width
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Most Upvoted Answer
In a single-pulse modulation of PWM inverters if pulse width is 120&de...
Degrees, the output voltage waveform will have a peak value equal to the DC voltage source. This is because the pulse width of 120 degrees means that the inverter is turning on for 1/3 of the cycle and off for 2/3 of the cycle. During the on time, the inverter output voltage will be equal to the DC voltage source, and during the off time, the output voltage will be zero. Therefore, the average output voltage over one cycle will be equal to the DC voltage source, resulting in a peak output voltage equal to the DC voltage source.
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In a single-pulse modulation of PWM inverters if pulse width is 120° thena)5th harmonic will be eliminatedb)3rd harmonic will be eliminatedc)7th harmonic will be eliminatedd)none of the aboveCorrect answer is option 'B'. Can you explain this answer?
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