Dear Friends,

low cost square wave inverters use two 180 degrees out of phase square waves to drive a centre tapped step-up transformer.I have once made one successfully with single 12 V battery source

But now I want to design pure sine wave on the same lines.I am trying to produce two positive halves of a sine wave 180 degrees out of phase.I have done so by passing sine wave from inverting and non inverting amplifiers separately and then clipping negative halves.But now I am trying to amplify both positive halves using non inverting opam amplifiers but not getting the desired output though working fine in simulation.

Actual problem is designing non inverting opam with single supply and ground reference.

Any practical ideas please.

 

It would be easiest to do it using a microcontroller. Use a look-up table to get the reference values for sine/cosine, and the uC controlling the ends of the transformer. Make it like a Class D amplifier.

 

Hello,

As SgtWookie already said: use a class D amplifier.
SPWM inverters use a kind of class D endstage.
Here is a page from the EDUCYPEDIA with links on SPWM:
http://www.educypedia.be/electronics/powercontrolspwm.htm

Bertus