TL494: SG3525 , TL494 "Short circuit and Overload protection"

Hi team! 
Last i was working with th UCC28950 IC , my board will arive in 2 weeks!
in this time line , I want to deal with some SG352X and TL494 PWM controller for new designs.
İn this case the power circuit is already it wil give almost 1500Watts output power in my structre but the controlling is a little bit complex.

So my question is how can i sense the current of the 72V , 20A output,
What for techniques are used for this?


Thank you.

Best Regards

Henk