It is required to control the speed and braking operation of a dc shunt motor in both the directions of rotation. The most suitable power electronic circuit will be

To control the speed and braking operation of a dc shunt motor in both the directions of rotation, we need a power electronic circuit that can operate in the four quadrants. Therefore, a dual converter is most suitable for this operation.

Note:

• Fully controlled bridge converters are two-quadrant converters having unidirectional current with both positive and negative voltage polarity.
• Half controlled bridge converter is used for one quadrant-operation.
• Dual converters are used for the four-quadrant operation. It has two converters that are connected back to back. One of the bridges works as rectifier (AC to DC) and other bridge works as inverter (DC to AC)