Discussion
True or false: a dc drive can regenerate into a supply fed through a diode bridge.
Answer: D
Correct answer: False, since a diode bridge cannot pass power in the reverse direction
A diode conducts in one direction only and its conduction is not controllable, so the bridge can rectify but never invert. When the machine begins to generate, the current has nowhere to go, the dc link voltage rises, and something eventually fails. Regeneration into the mains requires a fully controlled bridge operating beyond 90 degrees, or an active front end; otherwise the energy must be burnt in a braking resistor.
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