Can you tell me what kind of power supply are used for carputers with standard ATX main boards?
Yes, I can. But I won't.
What I will do is point you to informational resources for you to figure out these answers on your own.
This is a hobby that requires lots of research & planning. So this is a great oipportunity to help get you in that mindset.
Now, I know for a fact that there is information on how to select a power supply, and it covers ATX power supplies. I am certain that when you find this piece of work, it will aid you in your quest for knowledge.
Have you looked in the FAQ yet?
How about the Wiki?
Under normal circumstances, a signature would go here.