No. of Pages: 2
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIRST SEMESTER M. TECH DEGREE EXAMINATION, DECEMBER 2018

Branch: Electrical & Electronics Engineering
Stream: Power COntrol and Drives

OIEE6501: POWER CONVERTER CIRCUITS

Answer any two full questions from each part Limit
answers to the required points.

Max. Marks: 60 Duration: 3 hours

PART-A

1. 8) Draw and explain voltage, current and power wave form of a practical switch. (4)
b) An invener is shown with four switches. Each switch is considered as non ideal,
with a forward characteristics given by Vf =1.6+0.110 V. The repetitive switching
frequency 15 500Hz SI and 54 are turned on at and tumed off at t=0.6ms.S2 and 3

are turned on at t=Ims and turned off at t=Il.6ms. Determine:
1006 maximum instantaneous power loss in any one switch ii)the average power
loss in it iii)the maximum instantaneous power output from the converter and its

average efficiency. (5)

2 a) Explain displacement factor and distortion factor (3)
b) Express the input current in Fourier series and detenn_ine THD and input power

factor of a single phase half wave diode rectifier (6)

3. a) Explain the operation of the current bidirectional and voltage bidirectional two

quadrant switches. (4)
b) Explain line voltage distortion at the input to the single phase diode bridge

rectifier. (5)