I'm trying to see if I can find a solution for a converted dell psu that shuts down with anything beyond a 50 watt halogen lamp load. This is the dell power brick that was originally powering the dell optiplex usff 745 / 760.
It's rated at 12 Volts 18 Amps, I've loaded it up with 50 watt lamp load and it's fine. But adding a second lamp, and it won't stay on, rather shutting down. I don't have a modest to large inductive load to try that, incase it was a resistive only issue. I think it might be seeing the higher resistive load as a short in the output.
What's thoughts on this , any ideas appreciated. If it is seeing that 100 watt load as a short, what might be a likely solution ? Would some kind of soft start remedy this problem, or maybe something in the power supplys feedback circuit. After looking at the under side of the pcb, reverse engineering this psu is probably beyond my ability. Just a way to add load and keep it running would be great. I've got remote and sense wires connected right at the load connection. And have tried removing sense feedback wire, but it makes no difference. I did think it might be adding the second lamp suddenly was the problem, but even connected from the start it won't power that 100 watt resistive load.
Thoughts appreciated and thanks for reading.
Ps. I have converted server power supplys over the years, and none shut down with 100 watt load. And I've even got up to 500 watts running fine on converted server power supplys. Just at a loss why this 12 Volt 18 Amp shuts down at 100 watts load, but happily runs a 50 watt load.