+ Post New Thread
Results 1 to 4 of 4
  1. #1
    Newbie level 6
    Points: 887, Level: 6

    Join Date
    Mar 2012
    Posts
    11
    Helped
    0 / 0
    Points
    887
    Level
    6

    Loading Effect In Modified Sine Wave Inverter

    Hello guys !

    I simulated a modified sin wave inverter in Proteus, the out is perfect 220v but when i attach a load it voltage drops to 1v. I dnt know why is loading effect happening in transformer. Kindly check the schematics and give me some solution to solve this problem :

    Click image for larger version. 

Name:	modified sin wave inverter new.jpg 
Views:	29 
Size:	115.6 KB 
ID:	74582

    These are the outputs with and without loads.

    Click image for larger version. 

Name:	Proteus simulation output.jpg 
Views:	21 
Size:	110.2 KB 
ID:	74583Click image for larger version. 

Name:	outputwithload.jpg 
Views:	13 
Size:	102.7 KB 
ID:	74584

    I tried to attach the buffer op-amps before fets but in vain. Kindly help me in this regard.

    Waiting.....

    •   Alt21st May 2012, 13:48

      advertising

        
       

  2. #2
    Member level 3
    Points: 1,536, Level: 8

    Join Date
    Sep 2009
    Posts
    65
    Helped
    12 / 12
    Points
    1,536
    Level
    8

    Re: Loading Effect In Modified Sine Wave Inverter

    Hello

    I don't know Proteus, but how did you model your transformer? Can you provide some details?


    Vlad



    •   Alt21st May 2012, 19:26

      advertising

        
       

  3. #3
    Newbie level 6
    Points: 887, Level: 6

    Join Date
    Mar 2012
    Posts
    11
    Helped
    0 / 0
    Points
    887
    Level
    6

    Re: Loading Effect In Modified Sine Wave Inverter

    Quote Originally Posted by bubulescu View Post
    Hello

    I don't know Proteus, but how did you model your transformer? Can you provide some details?


    Vlad
    Thanks for your reply sir !

    i configure my transformer by the setting the values shown in figure. Its set that when i apply Ac 220v on primary it produces 10-0-10 on secondary.

    Click image for larger version. 

Name:	transformer setting.JPG 
Views:	22 
Size:	138.7 KB 
ID:	74633



    •   Alt21st May 2012, 20:10

      advertising

        
       

  4. #4
    Member level 3
    Points: 1,536, Level: 8

    Join Date
    Sep 2009
    Posts
    65
    Helped
    12 / 12
    Points
    1,536
    Level
    8

    Re: Loading Effect In Modified Sine Wave Inverter

    The inductances of the primary and secondary should be different if the ratio is different: L1=L2*(N1/N2)^2 . For example, let's say you have a 1H secondary inductance and the ratio is 12/220, then the primary would be approximately:
    L1 = 1H*(12/220)^2 ~ 3mH
    Also, the coupling coefficient can be safely chosen as 0.99, but set it to 1 for a better understanding of a quick simulation. Remember that in real life, you have much more than these, but you will have to calculate them yourself though, based on the requirements, this was just an example; find some good tutorials on the internet about transformer design.


    Good luck,
    Vlad



--[[ ]]--