Need help with current sensing circuits
- From: "Patrick" <pdebella@xxxxxxx>
- Date: 31 May 2005 09:12:06 -0700
Hello!
I was wondering if anyone has or knows where I can find a simple, cheap
current sensing circuit that I could use to sense AC currents. I am
currently working on a power control project that will monitor 120 VAC
outlets with a total maximum current of 15 amps. We are currently
working with a current sensor that outputs an AC voltage (actually a
varying DC voltage since it does not drop below zero) from an AC input
current from 0-50A. When the input current is zero the output is about
2.5V. At the full rated input current of 50 amps the sensor output has
a peak voltage swing of about 2.5V which ranges from zero to 5V at the
full 50 amps (swings around the 2.5V q-point).
The current sensor works great, but the problem is that we need to find
out what the actual current is and this poses somewhat of a challenge
since the output of the sensor is a varying DC (sinusoidal) voltage.
We've tried some software techniques to capture the peaks, but it takes
up too much processor time and is therefore not feasible.
Anyone have any ideas or circuits I might be able to try? Any help
will be greatly appreciated.
Patrick
.
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