A general analysis of the switch-mode inverter (shown in Figure 2 below) is to be done. The switching frequency fs, which is also the frequency of the triangular signal, is 1450 Hz. The DC voltage, X, is 600 V. The output voltage is a sinusoidal voltage with a frequency equal to 50 Hz. The load is connected between the inverter leg A and the DC voltage midpoint o.
Figure 2:
(a) Find the frequency modulation ratio, mf, if it is equal to 0.8.
(b) Compute the RMS value of the 5 most dominant harmonics of X (at ma=0.8). Also indicate the frequencies at which these harmonics appear.