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Hi ssembo,
before you try building your own inverter I recommend to search the internet for pure sine inverters made in China.
A 1,000W pure sine inverter is about US$60. They are sold in Thailand and used for TV and movies (from CDs) on cross country buses. They work pretty reliably.
Boncuk
I want one of those. Got any links Hans? That is dirt cheap.
Ron
Hi Grossel
My TV (and my computers) work fine on a modified sine wave inverter. My longest test runs being about an hour and never a problem. ... the outputs of my inverters seem to power things fine, including the cordless phones wall wart supplies. While during a power failure the longest they would normally run on inverter is less than ten seconds before my generator is online, I have never had a problem during test with the modified sine from my inverters.
Ron
The only thing I found to not run on it are things with motors. For example, I tried running a small air compressor on it, no dice.
Most Inverters produce what is called a modified sine wave (which looks nothing like a sine wave) but anyway here is a link to one such version. The link uses a uC (Micro Controller) but note the similarity between the circuit you posted and the linked circuit.
This is a link to pretty much the same circuit by the same author using everyday discreet components to drive the transformer.
The first link provides a good series of wave forms.
In most cases it is easier to buy than roll your own but for those who wish to build their own you will see pretty much all versions look the same as far as two transistors of sorts driving a transformer. While some critical systems need a true sine wave a device like a light bulb really doesn't care.
<EDIT> Something to keep in mind as mentioned is for every 100 watts out you will draw about 10 amps of 12 volt power. Keep that in mind for the feed wire from the 12 volt source and power to the MOSFETS. Also, you gonna need a big battery! </EDIT>
Ron