I'm attempting to convert a Mac power supply 18V 6 Amp power supply to push out full Voltage/Current to power a power tool.
The problem i'm having is, I'm able to get the power supply to output full current after the first time it's plugged in. The second attempt at pulling power from it fails.
It appears to have a current sensing circuit that drops gates the current after the initial draw drops to 0 and doesn't come back.
There is 3'rd wire in the cable that i've found is the sensing wire. I'm using a 10k resistor and .1uf capacitor to fool the circuit initially to get full voltage, but after the first pull of the power tool it doesn't allow another.
I'm thinking it might need some kind of constant load even if the tool is not pulling to keep the sensing gate always open but i don't know what that would look like.
Any help would be appreciated, and if i haven't explained the problem well please let me know and i'll try to answer the best I can.
Thanks,
The problem i'm having is, I'm able to get the power supply to output full current after the first time it's plugged in. The second attempt at pulling power from it fails.
It appears to have a current sensing circuit that drops gates the current after the initial draw drops to 0 and doesn't come back.
There is 3'rd wire in the cable that i've found is the sensing wire. I'm using a 10k resistor and .1uf capacitor to fool the circuit initially to get full voltage, but after the first pull of the power tool it doesn't allow another.
I'm thinking it might need some kind of constant load even if the tool is not pulling to keep the sensing gate always open but i don't know what that would look like.
Any help would be appreciated, and if i haven't explained the problem well please let me know and i'll try to answer the best I can.
Thanks,