3. PWM Inverter The full bridge inverter is used to produce a 60 Hz voltage across a series R-L load using bipolar PWM. The dc input to the bridge is 100 V, the amplitude modulation ratio ma is 0.8 and the frequency modulation ratio m, is 21. The load has a resistance of R = 100 and a series inductance of L = 20mH. Determine the a) the amplitude of the 60-Hz component of the output voltage and load current b) power absorbed by the load resistor c) THD of load current. m,=1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0.50 1.08 n=1 1.00 0.90 0.80 0.70 0.60 0.40 0.30 0.20 0.10 0.60 0.71 0.82 0.92 1.01 1.15 1.20 1.24 n=m; n=mf±2 1.27 0.00 0.32 0.27 0.22 0.17 0.13 0.09 0.06 0.03 0.02