Protection against regeneration in using power supplies.

8 years 10 months ago #29526379 by JAm1
I\'m thinking of using power supplies for my controller(sdc2150 running on 48v). To protect my circuit against regeneration I am planning to use a 100ohm 100watt load in parallel with the power supply then I will use maybe a relay/transistor to switch on the load via a digital out pin that will send a signal to the relay/transistor to switch it on when overvoltage is detected. Will this set up be enough? Im using the controller to build something similar to a robotic Arm

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8 years 9 months ago #29526385 by roboteq
that would work, but you will need to write a very short and simple script to activate the output when it rises above your power supply\'s normal voltage.

100ohm is probably going to be too high a value to do any serious braking, depending on your motor load\'s inertia.

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8 years 9 months ago #29526393 by JAm1
Just a question, why would I need to write a script? Can\'t I just set the digital output to activate when it detects an over voltage in the Roborun configuration menu?

What would be the best resistor value for this operation? Correct me if I am wrong, but i don\'t think that there would be any serious regeneration or braking with my application (robot arm)

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8 years 9 months ago #29526395 by roboteq
A digital output can be configured so that it becomes active when an overvoltage condition is detected.

However, when overvoltage is detected, this also causes the mosfets to go Off, and so the overvoltage condition goes away right away. Then the mosfets go On again, and overvoltage is detected again, then off, etc . With an oscilloscope you would see this oscillating until motor speed has decayed.

Practically, this means there is no braking.

If you want braking, the load should be put across the voltage input, at a threshold that is below the overvoltage level.

Regarding resistor value, you will need to test different values to determine optimal for your applciation.

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