Okay.I'm going to breadboard Eric's design and test it out. I'll keep everyone posted on the results. I should have all the parts (including the fuel sender unit) by Monday.
NO no no. You don't want the voltage rating anywhere near the actual voltage. I would try for at least 60 volts on a 12V battery system.It is a MOSFET P-CH 16V
Since safety is a consideration, some thoughts.
Maybe add a 3-position toggle switch, center off, to allow for manual override. If you think having the pump fail to come on is bad, consider it failing to turn off!
Automotive and marine electrical systems are notoriously noisy. Whatever circuit you end up with should be "hardened" against this noise and transients. I'm no expert on this.
Whatever switching voltages you choose probably change with the system voltage, from 11 to 15V or so. The "reference" voltage established by the voltage divider in this circuit will also move. This may all work out ok but be aware. A voltage regulator to protect the circuit might be helpful.
You may want to put a 47K resistor (value doesn't matter much) between the sensor and the comparator input, and put a 100uF or larger capacitor on that pin and ground. This would prevent fast switching from sloshing, electric transients and so on.
Since almost any comparator you get will have 2 or 4 comparators in the package, you could use the 2nd one to reverse the logic and use the Nfet arrangement.
It will also make the system start up in the "on" condition so it tops up every time the power first comes on. TS preferred this in post #1.You may want to put a 47K resistor (value doesn't matter much) between the sensor and the comparator input, and put a 100uF or larger capacitor on that pin and ground. This would prevent fast switching from sloshing, electric transients and so on.
|Thread starter||Similar threads||Forum||Replies||Date|
|C||Determining inrush current on manufactured AC and DC Pumps||Power Electronics||28|
|M||agricultural motor pump controller||General Electronics Chat||1|
|E||Simple Solar Powered Pump w/ Rechargeable Battery||Power Electronics||18|
|S||Identify the ic||Datasheets, Manuals & Parts Identification||2|
|Brushless (BLDC) Motor/Pump speed controller||General Electronics Chat||2|
by Jake Hertz
by Steve Arar
by Luke James