How to step down DC voltage

[rajeshputta]

1)i need to step down the DC voltage 48v 75amp to 24 v 75amp.
for above any ready made convertor is available in market?
2)i have a dc source 30Vdc 10amp, i need to charge a battery using that, i looking for charging circuit please help.

rajesh.p

 

[davenn]

hi there

do some googling on DC-DC buck convertors, you may well find some commercial systems with the voltage and current capabilities you require

 

[Mike_In_Plano]

Rajesh,
Can you share with me the nature of your source. Perhaps I know of something to simplify this problem.

 

[rajeshputta]

i have bench type dc Voltage source, it have duel channel (+ve) and (-ve), and also available make adjustable of load amp,
it is i am using for trouble shooting of electronics.

 

[Windadct]

75A is not a trivial amount of current... also nearly 2KW overall, so 2-3% losses 40W heat... and then how clean do you need the 24V to be? I doubt you will find an economical converter that specific. For a basic converter not too difficult of a build for a small uC ( PIC) and a 100A Mosfet ( module?)
Similar for the battery charger - for batteries the current regulation needs to match the battery chemistry. There are controller ships for most types, but again probably not an existing system ( perhaps a marine system made for 36V to 12V if LA Battery( assuming) )