kinarfi
Well-Known Member
Hi,
I am not sure what you are asking then. Current limiting with a resistor only works in certain situations, and if you have the current already being measured then there is a way to use that measurement to feed back to a circuit (perhaps another circuit altogether) to either shut down or just lower the current.
A typical method is to measure the current through the transistor itself and shut down if the current goes too high.
Me Neither, got any good suggestions about about how to handle the current at the end of travel when the current sky rockets due to the stall. I did use the LEM output once to trip a relay that just dropped all power to the motor until the input was zeroed. The current/present method seems to work by increasing the negative feed back as current increases, but it's so instantaneous, it seems to like it's messing with the wave form, but it is working, if I can keep the FETs alive, which I think I can now because of the advice I received in this thread.
Thanks all!!!
Jeff