ACS712 current sensor

[jouyorin]

Is it possible to use acs712 to mesure an AC current between 0 and 50A (because acs712 / 30A)
if yes how should i modifie the circuit!!

 

[paulfjujo]

hello

i allready tested ACS712-5 , range only 5 Amp!
and internal shunt is * 1.2 milliOhm for this device
if you want extend the range of yours from 30Am to 50Amp
you can add , in parrallele an external shunt to derive 20A..
see data sheet of you device to kow th internal value of shunt, and calculate what must be the value of external shunt.
or buy another 30A and connect it in parrallele to get 60Amp of range !

 

[jouyorin]

Ok i will try that ..thank you very much paulfjujo .

 

[FvM]

allready tested ACS712-5 , range only 5 Amp!
and internal shunt is * 1.2 milliOhm for this device
if you want extend the range of yours from 30Am to 50Amp

AC712 is a magnetical (hall effect) sensor and not specified for the primary conductor resistance. It's a copper bar and the initial resistance variation and temperature drift will considerable reduce the accuracy if you extend the range with a shunt.

Instead you should use a sensor with appropriate range. Please consider that the current range must be sufficient for the peak value of a sine input current, e.g. 70A for 50 Arms.

 

[jouyorin]

thnx for this information .. i found the acs758 sensor it looks good for my project but i have to make simulation with isis proteus however i didn't found this sensor in isis library have you any idea how to crate it please !!