Recent questions tagged power-electronics

The figure shows a straight-line approximation for the forward characteristics of a power diode. A continuous on-state current of $15 ~\text{A}$ is flowing through the di...

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 $\text{MOSFET}$ turn $\text...

In the linear regulator circuit shown, the base to emitter voltage $\mathrm{V}_{\mathrm{BE}}$ of the BJT is $0.6$ V. The Zener diode clamps the base voltage to $5.4$ V. I...

Consider the circuit shown. Assume that the diode $D$ is ideal. The supply voltage $v_{s}=325 \sin (2 \pi 50 t) \mathrm{V}, L=500 ~\mu \mathrm{H}$, and $R=10 ~\Omega$. Th...

The MOSFET switches shown in the circuit are ideal.Which of the following is the correct option for Boolean logical expression of the output (OUT), and the maximum possib...

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 switch...

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 t...

Consider the circuit shown. Assume that the diode ( $D$ ) is ideal.Given $v_{s}=100 \sin (2 \pi 50 t) \mathrm{V}, V_{d c}=50 \mathrm{~V}$, and $R=10 \Omega$, the average ...

The operating region of the developed torque $\left(T_{e m}\right)$ and speed $(\omega)$ of an induction motor drive is given by the shaded region $OQRE$ in the figure. T...

The input voltage $v(t)$ and current $i(t)$ of a converter are given by,$\begin{array}{l} v(t)=300 \sin (\omega t) V \\ i(t)=10 \sin \left(\omega t-\frac{\pi}{6}\right)+2...

In the circuit with ideal devices, the power MOSFET is operated with a duty cycle of $0.4$ in a switching cycle with $I=10 \mathrm{~A}$ and $V=15 \mathrm{~V}$. The power ...

A $3$-phase, $400 \mathrm{~V}, 4$ pole, $50 \: \mathrm{Hz}$ star connected induction motor has the following parameters referred to the stator:$$R_{r}^{\prime}=1 \Omega, ...

The $3$-phase modulating waveforms $\left(v_{a}(t), v_{b}(t)\right.$ and $\left.v_{c}(t)\right)$, used in sinusoidal PWM in a Voltage Source Inverter (VSI) are$$ \begin{a...

In the following circuit, the average voltage$V_{o}=400\left(1+\frac{\cos \alpha}{3}\right) \mathrm{V}$where $\alpha$ is the firing angle. If the power dissipated in the ...

The steady state capacitor current of a conventional DC-DC buck converter, working in CCM, is shown in one switching cycle. If the input voltage is $30 \: V$, the value o...

​​​​​If the following switching devices have similar power ratings, which one of them is the fastest?$\text{SCR}$$\text{GTO}$$\text{IGBT}$$\text{Power MOSFET}$

​​​​​A single-phase triac based $\text{AC}$ voltage controller feeds a series $\text{RL}$ load. The input $\text{AC}$ supply is $230 \mathrm{~V}, 50 \mathrm{~Hz}$. The va...

A forced commutated thyristorized step-down chopper is shown in the figure. Neglect the $\text{ON}$-state drop across the power devices. Assume that the capacitor is init...

A single-phase half-controlled bridge converter supplies an inductive load with ripple free load current. The triggering angle of the converter is $60^{\circ}$. The ratio...

A single-phase full bridge voltage source inverter $\text{(VSI)}$ feeds a purely inductive load. The inverter output voltage is a square wave in $180^{\circ}$ conduction ...

In the $\mathrm{DC}-\mathrm{DC}$ converter shown in the figure, the current through the inductor is continuous. The switching frequency is $500 \mathrm{~Hz}$. The voltage...

The chopper circuit shown in figure (i) feeds power to a $5 \text { A DC}$ constant current source. The switching frequency of the chopper is $100 ~\mathrm{kHz}.$ All the...

A semiconductor switch needs to block voltage $\text{V}$ of only one polarity $\text{(V>0)}$ duringOFF state as shown in figure (i) and carry current in both directions d...

The circuit shown in the figure has reached steady state with thyristor ' $\text{T}$ ' in $\mathrm{OFF}$ condition. Assume that the latching and holding currents of the t...

The single phase rectifier consisting of three thyristors $T_{1}, T_{2}, T_{3}$ and a diode $D_{1}$ feed power to a $10 \mathrm{~A}$ constant current load. $ T_{1}$ and ...

A charger supplies $100\:W$ at $20\:V$ for charging the battery of a laptop. The power devices, used in the converter inside the charger, operate at a switching frequency...

A single-phase full-bridge diode rectifier feeds a resistive load of $50\; \Omega$ from a $200\:V$, $50\:Hz$ single phase $\text{AC}$ supply. If the diodes are ideal, the...

The voltage at the input of an $\text{AC-DC}$ rectifier is given by $v\left ( t \right ) = 230 \sqrt{2} \sin \omega t$ where $\omega = 2\pi \times 50$ rad/s. The input cu...

Consider an ideal full-bridge single-phase $\text{DC-AC}$ inverter with a $\text{DC}$ bus voltage magnitude of $1000$ $\text{V}$. The inverter output voltage $v\left ( t ...