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A single phase full bridge sinusoidal PWM inverter is fed from a 120 V dc .The output of the inverter is connected to the load via a step up transformer with turns ratio of 1:3. The fundamental component of the load voltage is 210 V rms. Assuming linear modulation, determine the amplitude modulation index. If modulation index is now increased to 4, determine the new DC link voltage required to maintain the same voltage across the

Modulation Index (m) = (V_m - V_dc) / V_dc

where:

V_m is the peak value of the modulating signal (fundamental component of the load voltage)

V_dc is the DC link voltage

Given that the fundamental component of the load voltage (V_load) is 210 Vrms, we can calculate the peak value (V_m) using the formula:

V_m = V_load * sqrt(2)

For the given scenario, we have a 120 Vdc input, and the output is connected to the load via a step-up transformer with a turns ratio of 1:3. This means the output voltage (V_load) will be 3 times the input voltage.

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