AC current detection

Much further then original post wants, but if anyone is looking for the best AC/DC accuracy the hall effect closed loop sensors are best. The Allegro hall effect sensors are open loop type.

The closed loop hall effect sensors have a feedback amp/coil that always drives the field in the torroid core to near zero so there is little variance due to nonlinearity of ferrite core material.

up to 4A @ 220V

accuracy is not an issue as i'm looking for 1/0 value

ronsimpson said:

I don’t see you soldering #12 wire to an 8-soic. (see picture of ACS712)

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The circuit using an ACS712 was just a suggestion. Solder pads must of course be adapted for the required wire size. (If necessary the mains carrying traces might also be widened (presently 1.016mm))

At 220VAC, 4A and 30deg/C the voltage drop is 10.6mV (1 oz copper layer). At a trace width of 1.27mm the voltage drop is 8.5mV.

Boncuk

Boncuk said:

The circuit using an ACS712 was just a suggestion. Solder pads must of course be adapted for the required wire size. (If necessary the mains carrying traces might also be widened (presently 1.016mm))

At 220VAC, 4A and 30deg/C the voltage drop is 10.6mV (1 oz copper layer). At a trace width of 1.27mm the voltage drop is 8.5mV.

Boncuk

Click to expand...

If you are using the one i suggested....you dont need to put in pcb,.....it can be hooked up on the load line itself....

Rajaneesh said:

What kind of load you are going to drive? KMoffet circuit has diode in series to the load....

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Actually I had several diodes in series with the load...in anti-parallel...so it does work with AC.

Ken