Discussion
It is required to drive a d.c. shunt motor at different speeds in both the directions (forward and reverse) and also to break it in both the directions which one of the following would you use ?
Answer: C
The right choice is a dual converter.
Driving a dc motor at variable speed in both directions and braking it regeneratively in both directions needs four-quadrant operation: both polarities of armature voltage and both directions of armature current. A dual converter, two fully controlled bridges connected in anti-parallel, provides this; one bridge carries forward current and the other reverse current, and each can rectify or invert.
A single full-controlled bridge can reverse its voltage (inverting) but cannot reverse the current, so it gives only two quadrants. A half-controlled bridge gives one quadrant, and an uncontrolled diode bridge gives no control at all.
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