Distinguish Between Voltage Biasing Requirements - Engineering Assignment Help

Assignment Task

Task 

Question 1    
Draw up two summary tables of how the various important power electronic devices are switched ON and OFF. Distinguish between voltage biasing requirements, current flow requirements and gate signal requirements:

Question 2    
Two diodes are to be connected in series to handle a total reverse voltage of 4 kV. The i-v characteristics of the diodes are shown in Figure P2.6 with Di shown in the solid line, D2 dashed. Draw and design a static voltage sharing circuit (including voltage ratings for the diodes and power ratings for resistors at a 50% duty cycle). Use the cross-over technique as mentioned in the tutorial. Show all steps, also graphical readings.

Question-3
See Tutorial 2 Q3. Repeat Ex. 3.11 (p.136) — but with changed parameters. Calculate the series inductor required to reduce current ripple (caused by the first harmonic) down to 10% for an Australian 240-Vms single phase input via a 5:1 transformer (and bridge rectifier to a 200 fi load). Take the diode volt-drops (Vora = 1 V) into consideration too. (Roughly by what percentage does this increase the accuracy of the calculation, compared to ideal diodes?)

Deduce the Fourier current components from the given Fourier voltage components (Eq. (3.12) p.109).

Now implement a spreadsheet to include three current harmonics (apart from the DC component). Use a trial-error method to find the inductor L required for 10% ripple (caused by the three harmonics). Roughly by what percentage does this increase the accuracy of the calculation (compared to one harmonic)?

Question - 4
Design (calculate the thermal spec of) a heatsink that would keep a semiconductor junction safe (below 100 °C) for a power dissipation that fluctuates between 7S W and 100 W.
The temperature inside the enclosure in which the transistor would operate, fluctuates between 0°C and 40°C.
Take Roi c = 0.1 °C/W and R04.5 = 0.2 °C/W.
Draw the thermal circuit to clarify matters before doing calculations.

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