pure sine wave inverter problem

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pakkiboy

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I have made circuits for pure sine wave inverter. first i have used SG3525 to covert 12v DC to 300 Dc , then i have make full bridge using Ir2101 and Mosfet 3205 , mine main issue when i give output of first crkt ( 300 v DC ) to drain of mosfets in bridge circuit , 300 dc voltage drops to 60 v dc and about 5 A current flow any help??
 

first of all you check the primary converter. disconect the 300vdc to the drain of mosfet. now conect a 100watt 230vac rated bulb on 300vdc
now check the 300vdc if it drops then their is a problem in primary converter

post your schematic & photo here
 

yes for temporary testing you can conect a 100watt bulb

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or if you have a load resistor of 100watt that also be ok
 

I have used this circuit ... as feedback is given in it , then why voltage drop to extreme level ?? any help ?

Regards

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this is crkt diagram of frst stage i used
http://obrazki.elektroda.pl/4566970400_1379271846.png
 

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