Discussion
In sinusoidal pulse width modulation inverter, the carrier wave is ______ and the reference wave is ______, respectively.
Answer: D
In sinusoidal pulse width modulation the gating signals are produced by comparing a sinusoidal reference (modulating) wave, whose frequency sets the output frequency of the inverter, with a high frequency triangular carrier wave. When the sine is above the triangle the switch is on, and the widths of the pulses vary sinusoidally, which puts the lower harmonics at higher frequencies where they are easy to filter.
So the carrier is triangular and the reference is sinusoidal, the order given in option D. A square wave is the reference in a different scheme, and the options that make the carrier sinusoidal or square reverse the roles. The answer is option D.
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