Q.Explain the working of DC to AC Inverter circuit.

A DC-to-AC inverter converts DC power to AC power at a desired voltage and frequency; a single-phase full-bridge inverter uses four IGBTs switched in diagonal pairs to produce an ac square wave. …

[!TLDR]

Four IGBTs in a bridge across $E_{dc}$ are switched in diagonal pairs ($Q_1,Q_4$ then $Q_2,Q_3$) to give a $\pm E_{dc}$ square-wave ac output whose frequency is set by the gating.

An inverter converts DC power into AC power at a desired output voltage and frequency; it is used for variable-speed ac motor drives, aircraft power supplies and uninterruptible power supplies (UPS) for critical loads such as computers.

Construction: A single-phase full-bridge inverter uses four IGBTs $Q_1$, $Q_2$, $Q_3$ and $Q_4$ connected across a DC source $E_{dc}$ (top node X, bottom node Y). $Q_1$-$Q_2$ form one leg with mid-point A and $Q_3$-$Q_4$ form the other leg with mid-point B; the load is connected between A and B. …