Discussion
To obtain a regenerative braking in a single-phase, full-converter DC drive, the firing angle of the full converter connected with the field winding must be ______.
Answer: D
In a DC drive supplied from a full converter, regenerative braking returns the energy of the motor to the supply. The converter must then work as an inverter, which for a full converter means a firing angle above \(90^\circ\), where the average output voltage is negative and so the converter can accept power from the DC side. For firing angles below \(90^\circ\) the converter works as a rectifier and the power flows from the supply to the motor.
The key gives more than \(90^\circ\), option D. The item speaks of the converter in the field circuit, which is loosely worded, and I took the key as the usual condition for inverting operation of a full converter. Zero, below 30 degrees and below 60 degrees are all rectifier conditions.
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