Non contact current sensor

Thread Starter

abadi

Joined Nov 8, 2009
16
hiii guys

i really need a help in my FYP , and its about non contact current sensor which is " Rrogowski Coil "

just to make it short
i have already design the coil and also the amplifier
the coil already work for high frequency ( 1 M ) and the result is 24mV, but my project is about low frequency between ( 1 f - 1k f )

so, i design the amplifier

which is non-invierter and my ( Rf = 100 K ohms , Ri = 1 K ohms )
so, my Gain is ( G = 100 )

when i pass 1M frequency through the coil and i connect the coil to my op-amp


but i dont get any result


could any 1 help me on that ?????????
why there is no result even the Gain is 100
 

bertus

Joined Apr 5, 2008
19,939
Hello,

Can you post the circuit?
What opamp / amplifier do you use?

Greetings,
Bertus
 

SgtWookie

Joined Jul 17, 2007
22,201
What values did you use for R1 and R2?
If R1=101 Ohms and R2 = 10k Ohms, you will get a gain of approximately 100.

Post the design details of your Rogowski coil.
 
Last edited:

Thread Starter

abadi

Joined Nov 8, 2009
16
Thanx bro
i will try to do it tomorrow and see how its gonna work
 

Thread Starter

abadi

Joined Nov 8, 2009
16
so, what i have to do ????
i have to increase it or decrease the gain ????
 

t06afre

Joined May 11, 2009
5,936
Yes you must a faster OPAMP. Why did you select the LT1014 in the first place? Also perhaps split up the gain stage. Instead of 1 stage with gain equal to 100 try two stages with gain equal to 10.
 

jpanhalt

Joined Jan 18, 2008
7,691
the coil already work for high frequency ( 1 M ) and the result is 24mV, but my project is about low frequency between ( 1 f - 1k f )
Did you read the article by Cappels here: http://www.cappels.org/dproj/aciprobe/ACCurrentProbe.html

He describes what you need to do to get low frequencies.

What do your calculations (see Cappels) show? Can you describe your coil to us in more detail? What actual frequencies have you tried?

John
 
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