l designed it at 2022 with toroid coil
read text below
12.5v main power supply
12v different source for auto control
(1:10 transformers) and ( current control voltage source) are toroid coil
positive line of main souce passing through to toroid coil. when the short circuit become higher current passing through to toroid coil and it create a voltage at between secondary coil end of toroid. this voltage drive the npn bjt transistor and after npn bjt transistor make off the mosfet
1k pot for sensitivity
push button NO at left : to activate the system
push button NO at right: to short circuit
l used it in my power supply and it works so well
