I have seen a number of topics on current transformers, but I would like to make one myself.
for a 1 off project I want to make a current transformer that can measure up to 20A on the 50Hz mains network.
initially I was looking at a 50mA output with 20A input, but then I end up with 400 windings which is a lot of work.
I would if anybody here has ever tried a 2 step aproach.
and if someone has ever tried it this way with what result.
I was thinking of 2 steps. first 20windings on the primary. that would give me 1 Amp on the secondary output.
first question now would be, can I short circuit this winding set or do I need a resistor ? for instance 10E that would give me 10V.
now I want to take that output and feed that again through 20 windings.
this then should result in 50mA current with 20A input. putting a 10 Ohm resistor over that would give me 5V with 20Amp primary.
Now I have never worked with current transformers, but what will be the output of the current transformer?
My initial guess is a 50Hz sinewave.
Can I feed this through a normal diode bridge rectifier?
As these should pass the current only in one direction I guess that I should be able to use a full bridge rectifier to convert the AC signal to DC.
Then add a capacitor parallel with the 10 ohm resistor to get an average current.
Has anybody had experience with doing it this way?