List of top Power Electronics and Drives Questions on Single-phase and three phase voltage and current source inverters asked in GATE EE

Consider the single-phase voltage source inverter circuit feeding an inductive load (\(L\)). Assume that the power MOSFET switches are ideal. \(S_1\) and \(S_2\) are switched on during the first \(10\ \mu\)s, and \(S_3\) and \(S_4\) are switched on during the next \(10\ \mu\)s in a switching cycle. The switches in the same leg are thus switched in a complementary fashion. Neglect the dead time. The waveform of the inductor current (\(i_L\)) in the steady state is triangular with a peak value of \(5\) A as shown.

The rms value of the current through the switch \(S_1\) is:

A single-phase full-bridge diode rectifier feeds a resistive load of 50 \(\Omega\) from a 200 V, 50 Hz single-phase AC supply. If the diodes are ideal, then the active power, in watts, drawn by the load is _________. (round off to nearest integer)

A single-phase full-bridge inverter fed by a 325 V DC produces a symmetric quasi-square waveform across 'ab' as shown. To achieve a modulation index of 0.8, the angle \( \theta \) expressed in degrees should be \(\underline{\hspace{2cm}}\) .
(Round off to 2 decimal places.)
(Modulation index is defined as the ratio of the peak of the fundamental component of \( v_{ab} \) to the applied DC value.)