Designing a circuit to measure short circuit current of a power supply every second. Measurement will be on for about 50ms every second. Heat design has been made for this about of time not constant current flow. Current can be up to 15A and the voltage up to 60V when in voltage source.
Want to provide reverse current protection in case the user connects polarity wrong so the components don't overheat. If this occurs I have tested the board and it goes over 180º. In normal mode no component goes over 45º.
Have designed following circuit but it does not work. Works fine in forward mode. In reverse polarity mode once I switch ON both MOSFETs and its fine but I cannot switch them back off even if the gate is set to GND and heat rises drastically.
Any thoughts what could be wrong?
Built new circuit but it's failing when V1 is higher than 50V.