Hi,
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.

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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.

 

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

 

Thankyou darkfeffy,
i'll check it out.

 

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.

thanx
sameer

 

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