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sg3525 pwm problem for 50hz 12v to 220v pwm....

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d@nny

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i have the following schematic for 50hz 12v to 220v dc. i have foud it from internet but not yet tested it. The problem is that how i can adjust pin no.2 the duty cycle by giving feed back from output 220 to obtain pwm? does it only require modification on the pin 2 or whole circuit needs to be changed?
przetwornica_na_sg3525_i_buz11_680.gif
1233950104_503_FT63013_flydriver1.png
 

A feedback amplifier and compensation circuit involving pins 1,2 and 9 should be supplemented. The 230 VAC output needs to be rectified for the feedback.
 
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    anhquy

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Please can u provide me a schematic ? i also have download the following diagrame
inverter 2.jpg
thanking you in anticipation
 

I don't have a schematic, but the feedback circuit of your example can basically work. The feedback amplifier should probably have a PI rather than a pure I characteristic for faster response.
 

please tell me which schematic i used i post 3 schematics. which one should i use
 

Hi,you can simply used step down transformer let's say 6-9volt from your final output and rectified it,use simple pot and control pin 1 of your SG3525.
 

You have only posted one schematic with AC voltage feedback, it's almost similar to what kabiru suggested.
 

This has PI feedback loop, Refer Pin 9,1, 2 connections.
Click to expand...
Yes. The time constants would be however scaled by a factor > 100 according to the 60 Hz operating frequency of your inverter.
 
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