Solved by verified expert:COMPLETE POWER ELECTRONICS AND ALTERNATIVE ENERGY COURSE QUESTIONS WITH MULTISIMProblems
Switch
Characteristics
6-1
Locate a data sheet for a 1N4004
diode. Determine its average forward current, maximum forward voltage, and peak
reverse voltage. Calculate the maximum power it must dissipate.
6-4
Design a switch using a Darlington
pair to drive a 35 Ω load powered from a 24 Vdc supply. Determine
the collector current, base current, base resistor, power delivered to the
load, and the transistor power dissipation for a 75% duty cycle pulse.
6-6
Find a bipolar junction transistor
with a maximum collector current of at least 9 A. From its data sheet determine
the maximum collector-emitter voltage, worst case β (or hFE),
worst case VCE, worst case VBE, and worst
case switching time.
6-8
Design a switch using an IRF630 to
drive a 25 Ω load powered from a 150 Vdc supply. Determine the drain
current, required gate pulse amplitude, power delivered to the load, and the
transistor power dissipation for a 80% duty cycle pulse, and the required heat
sink maximum thermal resistance for TA = 60°C.
6-9
Locate a data sheet for an IRF630
MOSFET. Determine its maximum continuous drain current, maximum drain-to-source
voltage, maximum gate-to-source voltage, junction-to-case thermal resistance,
channel resistance at 100°C, gate-to-source voltage to drive it on,
switching time, and gate capacitance.
6-10
Locate a data sheet for an IRFZ14
MOSFET. Determine its maximum continuous drain current, maximum drain-to-source
voltage, maximum gate-to-source voltage, junction-to-case thermal resistance,
channel resistance at 100°C, gate-to-source voltage to drive it on,
switching time, and gate capacitance.6-11 It is decided to use four IRF530s in
parallel to drive a 35 Ω load from a 24 Vdc supply with a 75% duty
cycle. Calculate the voltage drop across the paralleled transistors, and the
power each transistor must dissipate. Is a heat sink needed? Prove your
answer with a calculation.6-18 In the circuit of Figure 6-31, transistors Q1 and Q4 are on
and current flows as indicated. The load has a significant inductance. Explain,
in detail how, and which Schottky diodes prevent the flyback when Q1 and Q4 are
turned off.Figure
6-31 ATTACHEDProblemsThyristor
Device CharacteristicsLocate a full set of specifications
for the Teccor S4006LS SCR and the Teccor Q4006LH triac. Use them to answer the
following questions.8-1 What is required to turn the Teccor
S4006LS SCR on?8-7 A 200 W light bulb is powered from a
120 Vrms line voltage, and is switched on and off with
a S4006LS SCR.
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