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# (Solved): A single phase full bridge sinusoidal PWM inverter is fed from a 120 V dc .The output of the invert ...

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

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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: