12V to 230V converter

[glebka11]

Dear everyone,

I have to build a 12V DC to 230V AC converter.
I have read a lot of articles about those converters, but they are all for 110V but not 220V, and they require a huge transformer.

In my case, i need the project to be in small size, NO big transformer, like in modern UPSes.

I heared that if you put bigger frequency to the transformer, it can be small sized.

And, this device is for VERY HIGH WATTAGE (between 100W and 350W)

Could you please help me?

 

[ljcox]

DM 927 is doing one for entitled :Full-bridge problem" 110 Volt, but it could be altered for 240 V.

Search for his submissions in this forum. I have been corresponding with him, I expect he will be happy to help you.

Len

 

[glebka11]

Im not that smart in electronics, and i cant change it.

Could anyone recommend the particular project i need for my problem listed before?

 

[Russlk]

Tripp Lite makes a 350 watt 12 volt to 110 volt, compact sine wave inverter. Use two of them for 220 volts. You can order them from JC Whitney, $46.99 each. www.jcw.com

 

[glebka11]

The idea is to build it , not to buy it

 

[niq_ro]

I have to build a 12V DC to 230V AC converter.
I have read a lot of articles about those converters, but they are all for 110V but not 220V

You must doubled the number n=500 for 110V ==> n=1000 for 220V

 

[pike]

yeah, you can use a smaller transformer with less windings and trade it for frequency.

Something like 80Khz will be sufficient. I don't know how do do the calculations over inductance and current/voltage and frequency, but all computers use this form of voltage conversion but with a tiny transformer for its output.

I don't know how you would convert that 80Khz ~ signal into 50/60Hz ~ though.

 

[niq_ro]

I don't know how you would convert that 80Khz ~ signal into 50/60Hz ~ though.

I think is better work directlly at 50 or 60Hz :wink:

 

[Nigel Goodwin]

I don't know how you would convert that 80Khz ~ signal into 50/60Hz ~ though.

I think is better work directlly at 50 or 60Hz :wink:

The problem with that is the cost, everything costs much more, and you (usually) only get a squarewave output - or it costs even more!.

Do doing it with high frequencies it makes everything much smaller and lighter, you rectify the output, and then chop it up using more FET's to produce your 50/60Hz output - by doing this in a particular way you get a psuedo-sinewave output, which while it doesn't look much like a sinewave, is close enough to work equipment that won't work from squarewaves.

You can buy these now at quite reasonable cost, building it yourself is likely to cost a lot more, and is fraught with difficulties - any slight errors will tend to blow lots of expensive parts. Buying it in your own country will get you a correct voltage one, no need to buy two 110V ones from elsewhere.

 

[glebka11]

anyone with particular circuit?

 

[Russlk]

Some day I am going to design a sinewave inverter using Don Lancaster's "magic sinewave" algorithim, but I am not going to give the design away free.