Gene Heskett wrote: > > But if I do that, the switch mode stuff itself will run reasonably cool, so > where does the heat actually go? Its got to go someplace, I just haven't > thought it through. > Using the inductance of the motor, the switching supply changes from a buck converter in normal mode to a boost converter when braking, and pumps the energy back into the DC supply. Fancier drives have a braking resistor on a switch transistor, and when the DC link exceeds some limit it turns on the braking transistor.
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