My googling skills have failed me ...
I need a microcontroller to detect when an AC load draws current in excess of 5A.
I've looked at using a Hall effect current sensor, something like TI's TMCS1100 with a 5V supply. This can be biased to output 2.5V with no current and using the part with 400mV/A sensitivity, would output 4.5v when the 5A AC current is flowing one direction, and 0.5v when the current flows the other.
My guess is that some type of comparator is required which will output a hi/low signal to the micro. But I'm not sure how to condition the output of the current sensor to feed into the comparator. As the sensor's output voltage is a sine wave centred around 2.5v can I somehow rectify it with a bridge biased at 2.5v ?
I can't see that I'm inventing anything new here so a little frustrated that I have not been able to find it by searching ! So any help especially with a link to a proven circuit is much appreciated.
Thanks
I need a microcontroller to detect when an AC load draws current in excess of 5A.
I've looked at using a Hall effect current sensor, something like TI's TMCS1100 with a 5V supply. This can be biased to output 2.5V with no current and using the part with 400mV/A sensitivity, would output 4.5v when the 5A AC current is flowing one direction, and 0.5v when the current flows the other.
My guess is that some type of comparator is required which will output a hi/low signal to the micro. But I'm not sure how to condition the output of the current sensor to feed into the comparator. As the sensor's output voltage is a sine wave centred around 2.5v can I somehow rectify it with a bridge biased at 2.5v ?
I can't see that I'm inventing anything new here so a little frustrated that I have not been able to find it by searching ! So any help especially with a link to a proven circuit is much appreciated.
Thanks