Ee 6503
Ee 6503
Ee 6503
11. a) Explain the construction and working of power semiconductor device, the device
which is employed for low power speed control of fan regulator applications.
Or
b) Explain any two methods of firing circuits employed for triggering latching
device.
12. a) Explain the effect of source inductance on low power two quadrant converter in
detail.
Or
b.) Describe the operation on high power multi-quadrant converter with neat
waveform.
13. a) Explain the working of capacitor based SCR commutated chopper with detailed
modes of operation.
Or
b) What is switching mode regulators? Explain the operation of inverting regulator
with detailed design.
14. a) Explain the operation of H-Bridge inverter with the case studies of under damped
and critical damped load. Derive an expression for Fourier analysis of rms output
voltage.
Or
b) Explain the harmonic mitigation technique used in single phase H-Bridge
inverter.
15. a) Explain the operation of three stage ac voltage controller with neat sketch.
Or
b) Explain the operation of continuous and discontinuous mode of operation of singe
stage variable voltage and variable voltage control of converter with neat sketch.
16. a) The two pulse-two quadrant converter is connected to a 230v, 50Hz supply. The
load current Ia is continuous and its ripple content is negligible Express the input
current in a Fourier series; determine the HF of the input current, DF and input
power factor. If the firing angle is 30 degree. Calculate Vdc, Vn, Vrms, HF,DFand
PF.
Or
17. The single phase popular inverter which has a resistive load of 10 ohm and the
input voltage of Vs=100 volt. Determine a) the rms output voltage at the
fundamental frequency b) output power c) the average and peak current of EACH
IGBT d) the pea reverse blocking voltage of each switch e) THD f) the HF and DF of
the LOH.