Discussion
The modulation index of a pulse width modulated inverter is the ratio of
Answer: C
Correct answer: the reference amplitude to the carrier amplitude
The modulation index is the ratio of the modulating signal to the triangular carrier, and it sets the fundamental output as a fraction of what the link can supply. Below one the relation is linear; above one the inverter over-modulates, gaining a little fundamental voltage at the cost of low-order harmonics.
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