Circuit diagram to detect short circuit and over current

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M.Rehan

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Any circuits to detect Short circuit and over current using PIC microcontroller (18F).

i.e
output of circuit changes from low to high OR high to low when short circuit happens or over current flows.
 

Hi,

AC, DC, isolated or not?

It sounds easy, but there are a lot of details to be discussed.
How fast?
Latching or not?

Tell us more.

Klaus
 
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    M.Rehan

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Isolation is required.

Circuit like attached but it does not have isolation and also not very reliable.
 

Hi,

A current transformer for isolation. Rectifier, filter, comparator.

Klaus
 
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    M.Rehan

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you could just use a hall sensor and read its output into a comparator to see if there is overcurrent. (ensure hall sensor bandwidth is fast enough for your purpose)
Short circuit has happened when output volts has gone to zero, so just detect the zero volts and that is it.
 
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