Hi,
I have a 12V DC fan drawing 18 amps.
I want a 2 second ramp for the fan startup. My DC supply system doesn't like abrupt amp increases you see.
Can someone draw a simple circuit to do this with component values calculated? It's a high temp (say 105 degree C) application.
Note that this is not the same as a normal current limiting DC motor startup -- those applications limit amps in the first few millisconds of startup. I'm talking instead about a really slow startup in the order of 2000ms.
Thanks!
Paul
I have a 12V DC fan drawing 18 amps.
I want a 2 second ramp for the fan startup. My DC supply system doesn't like abrupt amp increases you see.
Can someone draw a simple circuit to do this with component values calculated? It's a high temp (say 105 degree C) application.
Note that this is not the same as a normal current limiting DC motor startup -- those applications limit amps in the first few millisconds of startup. I'm talking instead about a really slow startup in the order of 2000ms.
Thanks!
Paul