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1. 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 1 us Time 2 us Time Turn-on Turn-off

1. 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 1 us Time 2 us Time Turn-on Turn-off

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
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1. 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 1 us Time 2 us Time Turn-on Turn-off 2. A single-phase single-diode (half wave) rectifier is connected to a 240 V, 50 Hz AC supply. Neglecting the diode volt drop, derive the instantaneous load current equation, determine the current waveform, mean load voltage, and the mean load current for a load of a. Pure resistor of 5 Ohm b. An inductance of 0.1 H in series with 10 Ohm resistor. (clue : B = 265° or 14.72 ms) 3. A single-phase full bridge fully controlled thyristor rectifier ( a = 45° ) is supplied by grid (supply) voltage of V, = 220 V (rms value). Assume that the load is represented by a constant de (flat) current, Ia = 10 A. The grid frequency is equal to 50 Hz. a. Sketch the output dc voltage va(t). Derive the equation for the average de voltage. b. Obtain average and rms value of a thyristor current, and PRV Peak Reverse Voltage of it. c. Calculate input active power, apparent power and power factor. %3D
Transcribed Image Text:1. 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 1 us Time 2 us Time Turn-on Turn-off 2. A single-phase single-diode (half wave) rectifier is connected to a 240 V, 50 Hz AC supply. Neglecting the diode volt drop, derive the instantaneous load current equation, determine the current waveform, mean load voltage, and the mean load current for a load of a. Pure resistor of 5 Ohm b. An inductance of 0.1 H in series with 10 Ohm resistor. (clue : B = 265° or 14.72 ms) 3. A single-phase full bridge fully controlled thyristor rectifier ( a = 45° ) is supplied by grid (supply) voltage of V, = 220 V (rms value). Assume that the load is represented by a constant de (flat) current, Ia = 10 A. The grid frequency is equal to 50 Hz. a. Sketch the output dc voltage va(t). Derive the equation for the average de voltage. b. Obtain average and rms value of a thyristor current, and PRV Peak Reverse Voltage of it. c. Calculate input active power, apparent power and power factor. %3D
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