I got my softpower circuit to work finally. After numerous attempts and configurations using only a single N and single P channel I wound using two N-Channel FETs and one P-Channel. That's more than I wanted, but I have the FETs already in only two chips, so, the heck with it. It works!
Well.... the protection circuit did not work when I breadboarded it. I should have known. The output pin is only high impedance when the MCU is powered on. Powered off it lifts to a high voltage even when pulled down by a 3K resistor. This results in the transistor turning right back on again.
I've been working on a protection circuit for medium large Li-Ion battery packs. The target application is a remote controlled car chassis, converted into a robot, and a Bioloid 20 servos humanoid robot.
The features I am looking for are:
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Photo credit: Alex V. Hernandez
40%
Current Amount: $4800
Target: $12000



