In earlier questions I raised a problem about a DC-DC booster that destroyed itself when its load was disconnected by drawing a large current from its input power source. This was specific when using Lead-Acid batteries (probably because a LA can deliver a large burst).
The task was (for me) to find a current-limiter solution on the input. I have tried a simple solution with a resettable (push) fuse, but that is too slow.
I have then found this device, based on a Allegro current sensor ACS712.
With this I can get a corresponding voltage reading from its current flowthrough.
So here we go. How do I use some external discrete components to activate a relay that disconnect the input power to the DC-booster? I know about electronics - but not that much. My simple guess is a zener that controls a transistor that powers the relay. But it must be good (with good I mean quick acting) and reliable.
From the curve, I can see that the wanted breaking point is around 3,2V at 6-7Ampere (It must break from 6A and up).
Below, links to my earlier questions about this problem