topology. The pulse width modulation of the full-bridge inverter produces a quasisquare voltage waveform at its output. This output voltage waveform contains fundamental and odd harmonic components. Since low Total Harmonic Distortion (THD) of output voltage is required, an L-C filter is used to filter out the harmonics to an acceptable level (<3%). The fundamental and its nth harmonic equivalent circuits are shown in Fig. 6(a) and 6(b). For an output voltage with low THD, the RMS output voltage is given by: The worst output harmonic voltage of the inverter is given by: This means that for a load independent output voltage with low total harmonic distortion, the output filter capacitor should be large. Let us now investigate the effect of a large filter capacitor on the voltage gain of the inverter. The maximum voltage gain of the inverter is given by:
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