Hi,
I need to pre-charge any unknown capacitor when it's connected to the DC-bus to prevend inrush currents.
[DC-BUS 700VDC] -> [My Device] -> [Unknown device with unknown input capacitor @700VDC]
The Input voltage will be 700VDC and the capacitor should be charged to same voltage level als the input.
When the unknown device is connected to the DC-bus it should be charged without inrush current but more controlled.
I thought about using a PCM current mode controller with a maximum Irms(Inductor) of 6A.
After I have read a lot of articles I wondered if it's even possible when I don't know the capacitor value and ESR to prevend the sub-harmonics?
Another Option is the LT3750, is this a better solution to charge the capacitor to 700V?
Kind regards,