Various aspects of home brew inverters

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Joined: 09/08/2007
Location: Australia
Posts: 4406
Posted: 01:44pm 08 May 2017      

Oh, I meant to say that current transformers can never produce a perfect square wave output with a square wave input current. The top of the waveform always has some tilt or downward slope that may be very slight or extreme.
It depends on the inductance of the CT and the value of the burden resistor.

As we may be switching our choke at a very low repetition rate, the very last thing we want is to add some unknown extra slope into the current ramp we are looking at.
The introduced errors will likely make a complete nonsense of the whole exercise.
So forget about current transformers.

We need dc coupling and a frequency response for the current measurement right down to zero frequency for this.
Cheers,  Tony.