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Current limiting circuit

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omerysmi

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Hello, I build some project which use a constant power supply of 30V 30A, and i want to limit the current because i'm not use such a huge current and i want to promise that my project will never get 30A in 100%.
I want to limit my project circuit current to 1A, what is the easiest way to do it?

C.L.png
 

Hi,

The load only draws that much current that it needs.
If you have a 30V 1A load, then it will draw only 1A (independent of power supply max current specification)

But in case of a failure (shore circuit, worng wiring...) it may draw a lot more.

Just to prevent an explosion, or fire you may use a slow blow 1A..2A fuse.
(A true current limitation - but still have precise voltage - is difficult. And in case of overcurrent it dissipates a lot of heat)

I hope this is what you wanted to know.


Klaus
 

Power Supplies have normally a current limiting mechanism but if that one hasn't, you may limit the current by using constant current source principle by aid of voltage regulator ICs however some voltage drops may occur.Look at this IC and you can take some inspiration on page 18.
http://cds.linear.com/docs/en/datasheet/3083fa.pdf
 

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