lesr Posted May 28, 2006 Report Share Posted May 28, 2006 hi i need help for 500w inverter i need a fliter for the out put 230 vac i us 2.2 uf 400v and its not good filter.......so i need new ciruit for filtering230v like the ups...[email protected] Quote Link to comment Share on other sites More sharing options...
audioguru Posted May 28, 2006 Report Share Posted May 28, 2006 Did you make the 500W inverter in our Projects section?The resistance of a 230VAC/500W load is only 105 ohms.The reactance of a 2.2uF capacitor at 50Hz is 1455 ohms.So the capacitor barely rounds the edges of the the square-wave at full load.If the load draws a low current then the circuit might make a tuned peak and create an output voltage much too high.It would be pure luck (or bad luck) if the capacitor tunes with the inductance of the transformer to your 50Hz mains frequency. Quote Link to comment Share on other sites More sharing options...
lesr Posted June 3, 2006 Author Report Share Posted June 3, 2006 hi i us emi filter its good now but the noise is very hi 4047 Quote Link to comment Share on other sites More sharing options...
audioguru Posted June 3, 2006 Report Share Posted June 3, 2006 hi i us emi filter its good now but the noise is very hi 4047The 4047 is electronic so doesn't make sound. Probably your transformer has loose laminations in its core that vibrate and make noise. Quote Link to comment Share on other sites More sharing options...
lesr Posted June 4, 2006 Author Report Share Posted June 4, 2006 yes the trnsformer have abig noise but its cool now i change lm358 with cd4011us two gate frome it ....my english not good can you translat my arabic writing you now we have big broblem with electricity in iraqand the heat reach 45 and no benzine for generatr i have old inverteri us it for 6 years tl494 with irfz44n but its for my family to operating roof fan so you know now why i look for agood inverter and for my pc to contact withthe world by d-link wireless....i hope im not bother any one Quote Link to comment Share on other sites More sharing options...
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