Discussion
A fully controlled bridge operating with a firing angle beyond 90 degrees is
Answer: A
Correct answer: inverting, returning power to the supply
Beyond 90 degrees the mean output voltage is negative while the current, constrained by the thyristors, still flows in the same direction, so the product of the two is negative and power flows from the dc side to the ac side. The machine must be generating for this to happen - it is being braked, and its kinetic energy is returned to the mains rather than dissipated. This is regenerative braking through a fully controlled bridge.
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