Unit 4During turn-on and turn-off of a power transistor, theVxcurrent-time and voltage-time relationships are asshown in the adjacent figure. Observe the waveforms50Aand calculate,44) the OFF-state power dissipation (static);45) the switch ON-state power dissipation(static);46) the average switching loss for the OFFtransition (dynamic);47) the average switching loss for the ONtransition (dynamic):25μs50μsAssume a switching frequency of 1kHz with Vx= 420V as specified in Appendix A.(8) A SKT40 SCR with thermal impedance characteristic shown below, has rectangular power pulses applied to it.Consider the power pulses (right), the Zthjscharacteristic (below) and calculate,15048) the rise in junction temperature from time100instant 100ms to the time instant 500ms;5049) the rise in junction temperature from timeinstant 100ms to the time instant 700ms;0 100 200 300 400 500 600 700 800 900 t50) the rise in junction temperature from timeTime in msinstant 100ms to the time instant 900ms;(9)PowerinWatt

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Unit 4 During turn-on and turn-off of a power transistor, the current-time and voltage-time relationships are as Vx shown in the adjacent figure. Observe the waveforms 50A and calculate, 44) the OFF-state power dissipation (static); 45) the switch ON-state power dissipation (static); 46) the average switching loss for the OFF transition (dynamic); 47) the average switching loss for the ON transition (dynamic); 25us 50us Assume a switching frequency of 1kHz with Vg= 420V as specified in Appendix A.

Unit 4 During turn-on and turn-off of a power transistor, the current-time and voltage-time relationships are as Vx shown in the adjacent figure. Observe the waveforms 50A and calculate, 44) the OFF-state power dissipation (static); 45) the switch ON-state power dissipation (static); 46) the average switching loss for the OFF transition (dynamic); 47) the average switching loss for the ON transition (dynamic); 25us 50us Assume a switching frequency of 1kHz with Vg= 420V as specified in Appendix A.

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...

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During turn-on and turn-off of a power transistor, the current-time and voltage-time relationships are as shown in the adjacent figure. Observe the waveforms and calculate, 44) the OFF-state power dissipation (static); 45) the switch ON-state power dissipation (static); 46) the average switching loss for the OFF transition (dynamic); 47) the average switching loss for the ON transition (dynamic); Assume a switching frequency of 1kHz with 437V.
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Q2: A transistor dissipates 50W in an ambient temperature of 60°C, the thermal resistances are 0-0.5 °CW¹, 8ca-4 °CW'. Determine the junction temperature without a heat sink. Determine the thermal resistance of the heat sink to avoid the junction temperature exceeding 180°C. 3
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Consider the circuit in Figure 2. The transistor has a parameter B that varies between 50 and 200. You want to know the operation of the circuit and the electrical variables at the end points. Calculate the following for B= 50 and B= 200. a) IE, VE and VB (Analysis in DC). b) The input resistance R." (Small signal analysis). c) The voltage gain VO/Vsing (Small signal analy). This 10 ΚΩ www o Rin 100 ΚΩ +3V +1₁ HH 1 ΚΩ 1₁ 1 ΚΩ