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R5966 Pages: 2 .

With the help of circuit diagram explain the operation of single phase semi
converter with RL load. Draw the waveform of input voltage, output voltage,
load current and voltage across the thyristor.

PART C
Answer any two full questions, each carries10 marks.
With the help of circuit diagram explain the working of three phase fully

controlled converter.

Sketch the waveform of input voltage, output voltage and output current of a
three phase fully controlled converter with R load operating at a = 30°.

Describe the working of a three phase voltage source inverter with an

appropriate circuit diagram.

Draw the phase and line voltagewaveform of the three phase voltage source
inverter with star connected resistive load on the assumption that each IGBT
conducts for 180°

With the help of circuit diagramexplain the working of single phase dual
converter with circulating current mode.

Write Fourier series expression for the output voltage from the single phase
half bridge and full bridge inverter and determine the equation for THD.

PART D
Answer any two full questions, each carries 10 marks.
Explain with suitable diagram, the principle of voltage control with single pulse
width modulation.

With the help of circuit diagram explain the working of single phase ac voltage
controller with R load.

A step up chopper has input voltage of 120V and output voltage of 360 V. If
the conducting time of the thyristor chopper is 100 145, Compute the pulse width
of output voltage

With the help of circuit diagram and waveform explain the operation of buck
converter and derive the equation of output voltage.

Describe how multiple pulse modulated wave can be generated from carrier and
reference wave.

Explain the design procedure of filter circuit for a boost converter with
continuous current mode

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