is it possible to convert
3v dc cell combination to 3v (0dc level) ac level or bit less.
to step up 3v ac to 220v or 200v ac with 0dc level.
then to run appliance by conncting appliance to terminals.
maybe it seems some nonsense question but i am demanding only iz it possible?

 

Yes it's possible. A simple technique is to use a common 12VDC input inverter that generates a regulated AC mains level output. You then need to provide a 3V to 12V dc/dc.

Is it practical - very unlikely - due mainly to power losses in the conversion processes, especially if you only want a little bit of power. But then again you may happen to have a large lead-acid battery or two lying about.

Stepping up AC voltage through a small transformer, say from 3V, will likely provide very poor regulation, but was often used in valve equipment to get a cheap form of high voltage bias supply.

Ciao, Tim

 

I think it is possible. But you better consult the technician. Because they know better in order for you to be safe and comfortable on your appliances. Good luck!

 

Considering that Lithium Ion batteries are the only 3V cells anywhere near capable of providing enough current to run even a smallish inverter (they're rather inefficient) unless it's to power something extremely small you've got a brick wall in your face.

Another thing to consider - even if you were capable of getting, say, 80% efficiency it would take around 100 Amps at 3V to generate 240 watts at 220 VAC. Perhaps if you explained what batteries you were intending to use and what you were wanting to drive off of this conversion circuit?