I have built a case containing a Raspberry pi which controls a bunch of 12V based devices (using a relay board).
I am using a PSX3-C12AFC model power supply that takes my mains and drops it to 12V.
As per someone else's advice here, I have opted to use a simple car USB charger (for lighters) to go from 12v to 5v.
I would ideally like to have no power switch on the system at all: I plug it in the mains, and it starts up the Raspberry pi.
However, I'm concerned that the surge from either PSU (or combination of both) is not healthy for the raspberry pi. So far, I've been connecting the PSU and manually connecting the USB cable to the pi to avoid any funky business.
I'm looking to automate this with some form of circuit/device that would only give current to the Pi after the current has properly established.
I am not an EE, and can do moderate DIY stuff. Can anyone point me to the right resources to achieve this? Or even what the circuit I'm looking for is called?