In a 3 phase VSI SPWM to use a single carrier signal and preserve the features of PWM technique, the normalized carrier frequency should be____________?
Correct answer: B. Odd multiple of three
- A. Multiple of two
- B. Odd multiple of three
- C. Odd multiple of five
- D. Odd multiple of seven
Explanation
For three-phase SPWM with one carrier, the carrier ratio is selected as an odd multiple of three, such as 3, 9, or 15, to preserve waveform symmetry and favorable harmonic cancellation. This corresponds to option B.
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