Linear sine source 50Hz, ~1A

[cupoftea]

Hi,
Any improvements on this...?

...too many T=10ms Switches

 

[cupoftea]

Please find here the LTspice sim of the opamp current source.......(from the above post).
Its got too many T=10ms switchs (FETs)

 

[Easy peasy]

linear current source - 50Hz, 1A, small variac with step down Tx, say 230:50V with 12% leakage - this will give a great current source ....!

 

[cupoftea]

Thanks, sorry i should have said, this is a highly dynamically variable AC current source for zero-ing out the "Imbalance field error" in line/neutral conductors going through an RCD CT....in a mains distribution box.
The Line/neutral carry 32Arms and are injected separately (i may need a long time to explain this bit out)...they are not "balanced" , so we need the small extra source to do the "balancing".

 

[Easy peasy]

same applies ....

 

[cupoftea]

sorry...as the imbalance changes with temperature etc...the current source i speak of has to sense the imbalance and constantly adjust current so as to avoid tripping the RCD....ie, we need it to be automatic, rather than a hand adjusted variac into a txfmr

 

[FvM]

Thats the price of a carelessly designed dual current source...

 

[FvM]

This topology was suggested previously in one of your threads. Easy to achieve100 ppm current matching with respective transformer parameters.