A high power current amplifier circiut?

[matinking]

A high power current amplifier circiut?

Hi everyone!
My research field is robotics and in one of my designs, i need to amplify a minor current to a current with very high amplitude (power amplifier). it almost could be able to amplify 0.5A to 20A. and as my robot is a mobile robot, such smaller circuit which is your suggest, must be compact as much as possible ans implemented in a restricted area!

can you help me to find such circuit? Of course due to its probable usage in a scientific paper please mention the design reference

thank you

 

[yungman]

For the size, linear regulator is out, you need switching constant current supply. I never designed any of this, I pull out some link that might help:

http://www.ottomat.hu/Kapcsrajzok/aramgenerator3.pdf

http://www.onsemi.com/pub_link/Collateral/NCP3065.PDF

Look at application notes of some switch mode controllers IC and they might have application notes on increasing current capacity using external transistors.