During turn-on and turn-off of a power transistor supplying a resistive load, the voltage and current variations are as shown in the figure below as idealized linear changes with time, where the V is off-state voltage and I is on-state current. Determine the mean switching power-loss due to switching at a frequency of 10 kHz. 300 V- - 200 A 200 A - 300 V I us Time 2 us Time Turn-on Turn-off

During turn-on and turn-off of a power transistor supplying a resistive load, the voltage and current variations are as shown in the figure below as idealized linear changes with time, where the V is off-state voltage and I is on-state current. Determine the mean switching power-loss due to switching at a frequency of 10 kHz. 300 V- - 200 A 200 A - 300 V I us Time 2 us Time Turn-on Turn-off

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

See similar textbooks

Similar questions

A resistor Ra is in series with a voltage source Va. Draw the circuit. Label the voltage across the combination as v and the current as i. Draw and label the volt–ampere characteristic (i versus v).
Q1. a) Figure Q1 is a single phase 2-level voltage source converter (VSC) with a total DC voltage V-1000V. A PWM scheme, by comparing a reference value with a 1kHz triangular waveform, is used to control the switches S₁ and S2, and output 340v at Vo. With the aid of graphs explain how pulse signals for the switches are generated, sketch the output voltage Vo, determine the duty cycle and the modulation index. Va + 2 it Va d + TS₁ V {1+5₂ = Figure Q1 A single phase VSC
3. A step-up chopper is to provide a 48V across a 12Y~load from a 12V d.c. supply. The chopper inductance is 10tzH and the chopper frequency is 100kHz. Determine the duty cycle required and the variation of battery current during switching, and the maximum and minimum battery currents
A load consists of XL=70 and XC=150 are connected in parallel across 120 Volt supply.The reactive power of the circuit is.......
Q1: Draw the d.c load line for the circuit shown in figure. NO SIGNAL VBB Vcc= 12.5 V www Re=2.5 k2
1) AC power in a load can be controlled by using a. Two SCR's in parallel opposition b. Two SCR's in series c. Three SCR's in series d. Four SCR's in series 2) The advantage of using free - wheeling diode in half controlled bridge converter is that a. There is always a path for the ac current independent of the ac line b. There is always a path for the dc current independent of the ac line c. There is always a path for the dc current dependent of the ac line d. There is always a path for the ac current dependent of the ac line 3) Silicon controlled rectifier can be turned on a. By applying a gate pulse and turned off only when current becomes zero b. And turned off by applying gate pulse c. By applying a gate pulse and turned off by removing the gate pulse d. By making current non zero and turned off by making current zero
A buck-boost converter operates with an input battery. It converts +12 V to –12 V at apower level of about 75 W. the switching frequency is 120 kHz. The switches have200 ns switching time. The battery has an internal series resistance of 0.2  and seriesinductance of 200 nH. (a) What is the operating value of the duty ratio? What power is lost in the battery resistance? (b) Propose an interface structure to improve operation and decrease losses. What are the duty ratio and battery resistance loss with your interface in place?
18. A dc-dc converter is to be built with the following specifications: Allowed dc input voltage range: +8 V to +18 V +24 V Output average voltage: Output voltage ripple: ±0.06 V maximum at rated load 300 W, resistive ±250 mA maximum at rated load 100 kHz Rated load: Input current ripple: Switching frequency: Common ground between input and output. a. Draw a circuit which can perform this function. b. What is the necessary range of duty ratio for each switch? c. Find circuit part values (R, L, and C) which will meet the stated specifications.
Part 1) Consider a step down converter with a resistive load. It is supplied by a DC power source of magnitude Vs = 160 V. The switching period is 0.25 ms and the duty cycle k is first set to 0.5. The load is resistive with R=10 Ohms. The critical value of L and the critical value of C are equal to: a. 0.625mH and 0.392uF b. 0.625mH and 0.196uF c. 0.312mH and 0.196uF d. None of these Part2) Now consider the same given but the load is an inductive load with R=10 Ohms and L=10 mH. The switch is ideal. Calculate The RMS load current Io and the RMS converter current Ir are equal to: Select one: a. 5A and 3.54A b. None of these c. 8A and 5.66A d. 12.5A and 8.84A
For the given BJT circuit, determine the operating point and plot the DC load line showing the Ic(sat) and Vce(max). 16 V 510 k2 Ing Ico 1.8kQ2 VC Vcto B-120
Q1: Draw the d.c load line for the circuit shown in figure. NO SIGNAL Van Vce= 12.5 V www Re=25 ka
ZEV * OMANTEL I. A moodle1.du.edu.om Question 2 Not yet answered Marked out of 2.00 P Flag question A buck converter produces an output voltage of 100 V across a 100 Ohm load resistor. The output voltage ripple is 0.5 %. The output current ripple is 2 A. The dc supply is 200 V. The switching frequency is 1 kHz. The value of the inductor is: Select one: O a. 25.00 milli Henry b. 35.25 micro Henry O c. None of the above d. 88.55 micro Henry O e. 75.15 nano Henry Previous page Next page