List of top Power Electronics and Drives Questions

Consider the boost converter circuit shown. Assume that the semiconductor devices are ideal. In steady state, the inductor current rises linearly from \(0\) A to \(6\) A in the first \(10\ \mu\)s and then falls linearly from \(6\) A to \(0\) A in the next \(10\ \mu\)s of every switching cycle as shown. The load resistance \(R\) is \(10\ \Omega\) and the capacitance \(C\) is \(500\ \mu\)F.

Neglect the ripple in the output voltage. What is the input voltage \(V_{dc}\)?

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:

Consider the circuit shown. Assume that the diode \(D\) is ideal. The supply voltage \(v_s=325\sin(2\pi50t)\) V, \(L=500\ \mu H\), and \(R=10\ \Omega\).

The peak diode current (in amperes) is (round off to one decimal place).

Consider the circuit shown in Figure (a). A gate pulse \(v_g\) is applied between time instants \(t_0\) and \(t_1\). After \(t_1\), during the MOSFET turn OFF process, it experiences a voltage overshoot.

Based on the \(v_{ds}\) waveforms shown in Figure (b), which one of the following options is correct?

The figure shows a straight-line approximation for the forward characteristics of a power diode. A continuous on-state current of 15 A is flowing through the diode.

What is the power loss in the diode?