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03000EE364052005

Draw the inductor voltage waveform of a buck converter and derive the input —output
voltage relation in terms of duty cycle.
Explain the working of full bridge dc-dc converter under PWM with unipolar voltage
switching.
Compare bipolar voltage and unipolar voltage switching of full bridge 60-60
converter.
PART C
Answer any two full questions, each carries 10 marks.
With neat circuit diagram and waveforms, explain the operation of flyback converter.
Explain the output control of a VSI by voltage cancellation method with waveform.
Calculate the duty ratio of a push pull converter having input voltage of 200V and
output voltage of 35 V. The transformer of push pull converter has 20 turns in
secondary and 60 turns in the primary.
Illustrate the working of three phase sine PWM inverter with circuit diagram and
waveforms.
PART D
Answer any two full questions, each carries 10 marks.
How switching pulses are generated using space vector modulation. Explain with an
example of any one sector.
Compare ZCS & ZVS Resonant Converters.
Explain selective harmonic elimination switching.

With neat circuit and waveforms, explain any ZCS resonant switch converter.

ಸಸ್ಯ KK

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