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Power ElectronicsPWM Inverters

In sinusoidal PWM, the amplitude modulation index in the linear region is commonly the ratio of?

  • AReference sine amplitude to carrier amplitude
  • BCarrier frequency to reference frequency
  • CDC-link voltage to load current
  • DSwitching loss to conduction loss
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Correct Answer: A. Reference sine amplitude to carrier amplitude
Explanation: For carrier-based SPWM, amplitude modulation index ma is the peak reference/modulating signal divided by the peak carrier signal.
Reference: Standard power electronics: pwm inverters
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