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E1154 Pages:

PART ட்‌
Answer any twofull questions, each carries10 marks.

With the help of circuit diagram explain the working of three phase semi
controlled converter.

Sketch the waveform of input voltage, output voltage and output current of the
three phase fully controlled converter with R load with a = 0°

Describe the working of a three phase voltage source inverter with an appropriate
circuit diagram.

Draw the phase and line voltage waveform of the three phase voltage source
inverter with star connected resistive load on the assumption that each IGBT
conducts for 120°.

A single phase bridge inverter fed from 200 ۷ ‏بعل‎ is connected to an RL load of
R=9Q and L=0.04 11. Determine the power delivered to the load in case the
inverter is operating at 50 Hz with square wave output.

With the help of circuit diagram explain the working of single phase dual
converter with circulating current mode.
PART 0
Answer any twofull questions, each carries 10 marks.
Explain different methods for controlling the voltage at the output terminals of an
inverter.

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

Explain the sinusoidal pulse width modulation used in single phase inverter and
draw its waveform.

Draw the circuit of buck boost converter and explain its working.
Explain different types of chopper.

A step up chopper has input voltage of 220V and output voltage of 400 V. If the
conducting time of the switch is 100 us, Compute the pulse width of output
voltage.

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