spwm prototype circuit

Discussion in 'The Projects Forum' started by onlyvinod56, Apr 1, 2009.

  1. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    iam designing spwm inverter. The output of the inverter should be sinusoidal. This is the first step of my project. i dont bother about the harmonics. I need to show an approximate sinusoidal, atleast 50% tolerance. The output voltage of the inverter will be around 12V AC.


    Iam not going to connect any load here. I just want to show the output in an oscilloscope. so, the load current here is very less. The DC input im giving is a 12V rectified supply (op from 7812).

    can u suggest me suitable static switches. (either mosfet / igbt / even transistor).

    Im using two XR2206 ICs. One for sine and the other for triangular. I have used LM324 to compare them. I got the pulses only on positive side. ofcourse i have used single supply.
    Last edited by a moderator: Apr 27, 2010
  2. darkfeffy


    Apr 1, 2009
    You might use irfp 150n it is rated 100V, 42A and has very low on-resistance (0.036ohms). Seems pretty sufficient for your purposes.
    Hope this helps
  3. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    Thankyou darkfeffy,
    i'll check it out.
  4. sambkn2bhu

    New Member

    Mar 28, 2010
    hi vinod... m also working on spwm inverter.. n m also using xr2206 n then LM324 as comparator... but not getting desired waveforms from XR2206... can u pls attach the scheme that u used to generate sine n triagular waves...pls do reply.

  5. onlyvinod56

    Thread Starter Active Member

    Oct 14, 2008
    hello sameer...

    The last post in this thread is one year back....now u r opening this again...
    anyways here is the solution....

    check the link http://www.nuxie1.com/guides/function-generator.html

    I mentioned lm324 but i used LM741 with dual supply (+/- 12V)...
    and i used irfz44 for testing as it is a prototype.....

    I compared the two outputs of xr22206 (sine & tri) with 741 and i inverted the signal with BC547 transistor wired in not gate config..http://forum.allaboutcircuits.com/showthread.php?t=21680

    then i had two signals...viz....regular and inverted.....

    use 500ohm resistors to the gate of each mosfet and....http://forum.allaboutcircuits.com/showthread.php?t=29190

    i used a centre tap transformer 12-0-12 / 230V - 5A....

    finally i tested with a 12v 7Ah battery.... it works good....try it ...

    attach the results please...i want to see