GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (OLD) EXAMINATION — SUMMER 2019
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Subject Code: 170906 Date: 10/05/2019
Subject Name: Advanced Power Electronics - I
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Explain basic series load resonance converter with necessary circuit diagram and waveforms. 07
(b) Explain operation of 12-pulse converter with circuit diagram and necessary waveforms. 07
Q.2 (a) Discuss basic concept of multilevel inverter. Write advantages and disadvantages of multilevel inverter. 07
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(b) List the separate DC sources used for cascaded multilevel inverter. Explain operation of five level cascaded multilevel inverter. 07
OR
(b) Discuss operation of three level diode clamped multilevel inverter 07
Q.3 (a) Explain Y-ZI transformer connection used for multipulse converter. 07
(b) List application of multipulse converter. Draw the transformer connections for 18 and 24 pulse converter. 07
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OR
Q.3 (a) Discuss operation of flying capacitor multilevel inverter. 07
(b) Compare multipulse converter with multilevel inverter. 07
Q.4 (a) Explain working of forward converter based switch mode power supply. 07
(b) Discuss two quadrant ZVS converter with necessary circuit diagram and waveforms. 07
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OR
Q.4 (a) Discuss push pull converter and its application in dc power supply. 07
(b) Explain operation of ZCS converter with diagram and wave forms. 07
Q.5 (a) Explain operation and control of On-Line and Off-Line UPS. 07
(b) Discuss working and operation of Brushless dc motor. Show derivation of switching pulses using Hall sensor signals. 07
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OR
Q.5 (a) Discuss phenomenon of electromechanical energy conversion in SRM. 07
(b) With neat circuit diagram and waveform discuss class E resonant inverter. 07
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