Hi i have planned to design a dc to ac conveter with 12vDC input and 230VA output, Please guide me how can i design inverter without transformer?

 

That's like asking for an airplane without wings!

A rocket is an airplane without wings: it's terribly inefficient, complex and expensive.

 

To using an oscillator and an amplifier to amplify the voltage from 12Vac to 230Vac.

 

Design H Bridge version

 

So where does the high voltage come from to begin with? 20 car batteries in series, capacitor/diode voltage multiplier, etc, etc? After you get the high voltage, the H-bridge sounds like the best bet to chop it up and reverse the polarity.

 

U forgot OP said VA. So It could be 1V at 230Amps

 

WOW! I missed the VA tag. Looked at it only as VAC. I guess a dry cell wouldn't quite do it either, would it? Have an appointment to get my eyes checked.

 

The Battery type is his problem.

 

The transformer is the most expensive part of a DC to AC inverter, If it were possible to make one without a transformer someone would have already done so. And they would probably be very rich.

 

It is possible to do without a transformer (but you do need an inductor). Make a step up converter to 325VDC then use and H-bridge to invert it to 230VAC. If you can get the boost converter to run in the MHz region, the inductor could be quite a bit smaller and less expensive then a 12V to 230V transformer.

Bob

 

I agree with Bob. If I took my square wave inverter apart, that's what I expect to find.

 

OP did not say 230VAC.

 

OP did not say 230VAC.

You're correct..But if he meant 230VAC, he didn't tell us how much current. So either way he left out some important information.