M.E.
DEGREE
ELECTRICAL AND ELECTRONICS ENGINEERING
Analysis and Design of Power Converters
2 MARK FOR ALL UNIT
1. Distinguish between power diodes and small signal diodes.
2. What are the advantages of GTO over SCR.
3. Define Latching current.
4. Recall the expression for average output voltage of phase full converter.
5. What is meant by phase controlled rectifier?
6. List out the drawbacks of phase controlled converter.
7. Identify the effect of source impedance on the performance of the converters.
8. Why Resonant converters are used when compared to conventional converters?
9. Classify the types of chopper configuration.
10. Define duty cycle.
11. Define phase angle control and on off control.
12. Name the methods of switching angle control scheme.
13. What is matrix converter?
14. List out different types of cycloconverters.
15. What are the advantages of sequence control technique?
16. List the applications of cycloconverter.
UNIT 1
16 MARK
1. Explain in detail about the operation of 1 phase full bridge converter with RLE load for
continuous and discontinuous load currents with neat sketches. Also derive the average and
RMS output voltage and current.(16)
2. List out the power factor improvement methodologies and explain any three of them.(16)
3. Illustrate the operation of GTO and also draw its VI characteristics.(16)
4. Explain in detail about the operation of 1 phase half converter with RL load for
continuous and discontinuous load currents with neat sketches. Also derive the average and
RMS output voltage and current. (16)
UNIT II
16 MARK
1. Discuss the effect of Source inductance on the performance of a three phase fully
controlled bridge converter and also. Derive an expression for output voltage.(16)
2. Briefly explain the continuous and discontinuous mode of operation of a 3 phase semi-
converter with RL load.(16)
3. A three phase half wave converter is operated from three phase star connected 208V,
60Hz supply and the load resistance is R=10 Ohm. If it is required to obtain an average
output voltage of 50% of maximum possible output voltage,
Calculate
(i) Delay angle
(ii) RMS and Average output currents
(iii) Average and RMS Thyristor current
(iv) Rectification efficiency.
4. Analyze the effect of source impedance on the performance of converter with necessary
illustrations.
5. Examine the three phase operation of full controlled bridge converter with necessary
illustrations.
UNIT III
16 MARK
1. Discuss in detail about the step up and step down chopper with necessary circuit
diagrams and waveforms.(16)
2. Illustrate the power circuit diagram of Boost regulator and explain its operation
with neat schematic waveforms.
3. Elaborate the operation of Class A and Class B types of two quadrant chopper.
4. Illustrate the operation of step up and step down chopper with necessary circuit
diagrams and waveforms.
UNIT IV
16 MARK
1. Demonstrate the operation of single phase full wave ac voltage controller with RL
load with the neat voltage and current waveform. Also derive the expression for
RMS value of output voltage.
2. Explain in detail about the operation of three phase full wave ac voltage controller
with R load. Also derive the expression for RMS value of output voltage.
3. Analyze the operation of single phase full wave AC voltage controller with RL load
with necessary voltage and current waveforms. Also derive the expression for RMS
value of output voltage.
4. Explain the operation of three phase full wave AC voltage controller with R load
with neat voltage and current waveform. Also derive the expression for RMS value
of output voltage.
UNIT V
16 MARK
1. Analyze midpoint and bridge configurations for 3 phase to 3 phase cycloconverter.
2. Explain the construction and operation of phase dual converter with neat circuit
diagram and waveform.
3. Elaborate the construction and working principle of three phase dual converter
with neat circuit diagram and waveform.
4. Analyze single phase to three phase cycloconverter with continuous and
discontinuous mode for a bridge type converter.
