COMPLETE POWER ELECTRONICS AND ALTERNATIVE ENERGY COURSE QUESTIONS WITH MULTISIM
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.
Design a switch using a Darlington pair to drive a 35 Î© 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.
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 Î² (or hFE), worst case VCE, worst case VBE, and worst case switching time.
Design a switch using an IRF630 to drive a 25 Î© 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 = 60Â°C.
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 100Â°C, gate-to-source voltage to drive it on, switching time, and gate capacitance.
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 100Â°C, gate-to-source voltage to drive it on, switching time, and gate capacitance.
It is decided to use four IRF530s in parallel to drive a 35 Î© 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.
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 ATTACHED
Thyristor Device Characteristics
Locate a full set of specifications for the Teccor S4006LS SCR and the Teccor Q4006LH triac. Use them to answer the following questions.
What is required to turn the Teccor S4006LS SCR on?
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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