I have a dual output PSU that take 9-36VDC in, and outputs +/-12V. This PSU is powered by my DC bench supply. This PSU is powering 2 amplifiers for signal processing, and a HV supply. The HV supply takes in 0-12V, and outputs 0-1000V. I need 900V, so I put a linear voltage regulator in to step down the 12V to 9V.
When powered separately, the LVR/HV supply function properly, and I get the 900V output. Same with the 2 amplifiers. However, when all are powered together, the PSU enters its short-protection mode, and will not power on. I noticed that if I start my DC bench supply at 0V, and slowly go up to the 24V I need, the PSU powers on and everything works properly. If I power off the bench supply while it is set at 24V, then turn it back on, the short-protection of the PSU engages.
The data sheet for this PSU states it has a max load of 298 mA before the short-protection engages. However, when all components are powered on and functioning properly, my bench supply reads only 150mA at 24V. More interesting is if I ramp up the bench supply from 0V to ~10V, it reads 400mA of current! Shouldn't the PSU shut off?
I would like to simply turn the bench supply on/off while set at 24V. Is there some way to automate the slow 0V to 24V ramp up via some circuit? Any advice would be greatly appreciated.