Andrew Leigh
Member
Hi all,
I am building chemelec's 220V inverter. It requires a 12-0-12V to 220V output transformer. Short of buying one thought I would try something.
I have two identical 650VA transformers from identical UPS's. The transformer windings are 13.3V / 220V and 24V. By connecting 12V to the 13.3V winding I would get 198 and 22V respectively making up my required output of 220V.
See the schematic below, is this possible or must the windings share the same core steel?
Secondly, I have been using a variac to power the 12V side of the transformer, on disconnecting (when live) I noticed that the 12V suddenly jumped to 20V when the load of the transformer was disconnected. This would mean an 8V drop, would this not represent an extremely high magenetising current? Is this normal?
Thanks for the help
Cheers
Andrew
PS: This is the third time I am posting this, must be doing something wrong!
I am building chemelec's 220V inverter. It requires a 12-0-12V to 220V output transformer. Short of buying one thought I would try something.
I have two identical 650VA transformers from identical UPS's. The transformer windings are 13.3V / 220V and 24V. By connecting 12V to the 13.3V winding I would get 198 and 22V respectively making up my required output of 220V.
See the schematic below, is this possible or must the windings share the same core steel?
Secondly, I have been using a variac to power the 12V side of the transformer, on disconnecting (when live) I noticed that the 12V suddenly jumped to 20V when the load of the transformer was disconnected. This would mean an 8V drop, would this not represent an extremely high magenetising current? Is this normal?
Thanks for the help
Cheers
Andrew
PS: This is the third time I am posting this, must be doing something wrong!