Im helping out my nephew who is interested in electronics and came to me because I specialize in automotive electrical (but Im pretty green when it comes to the controller side of things as I deal with the harnesses and physical components external to the controller). He is a home schooled kid and as a summer project, he wants to make a programmable fuse that would theoretically replace a regular mechanical fuse. I explained that car manufacturers do just this nowdays and I'd be happy to help him out. I tried my hand at this years ago and wasnt really worth my time, but he is getting into cars and really wants to do this.
What Im looking for is some direction to the right components I should consider for the project beyond the microcontroller. A typical automotive load that a regular ATO style fuse would handle is 5-30A at our nominal 14v. My thinking was to use a shunt style current monitor circuit with an ADC back to the micro and an output from the micro to a MOSFET that would be able to PWM the current to its programmed limit or if its simpler, to just cut off the current flow if it is a dead short. Im not interested in dealing with motors and the inrush issues and hoping more to make something that would handle halogen or incandescent lights.
I've seen some components from TI and MAXIM that looked like they would work, but I hoped that I could get a bit of advise on what I should look at in particular. If you need any particulars, I will be happy to give them if necessary.
What Im looking for is some direction to the right components I should consider for the project beyond the microcontroller. A typical automotive load that a regular ATO style fuse would handle is 5-30A at our nominal 14v. My thinking was to use a shunt style current monitor circuit with an ADC back to the micro and an output from the micro to a MOSFET that would be able to PWM the current to its programmed limit or if its simpler, to just cut off the current flow if it is a dead short. Im not interested in dealing with motors and the inrush issues and hoping more to make something that would handle halogen or incandescent lights.
I've seen some components from TI and MAXIM that looked like they would work, but I hoped that I could get a bit of advise on what I should look at in particular. If you need any particulars, I will be happy to give them if necessary.
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