Push-Pull Inverter and Transformer Problems

[Woody81]

Hi,

I’m new to the forums and wonder if someone can help me with a Multisim problem.

Basically I’m designing a simple push-pull inverter comprising of a transformer with a centre tapped primary winding (TS Power), a 24V DC supply and two MOSFETS.

The centre tap of the transformer is earthed and the 24V DC supply is connected to the two outer ends of the primary winding via each MOSFET.

I’ve constructed a 555 timer circuit to provide a pulse train to fire the gates of each MOSFET in turn.

My problem is that although I get the desired secondary waveform output (modified sine wave) the voltage magnitude doesn’t appear to relate to the transformer turns ratio?

Am I doing something wrong?

Many thanks for any advice in advance.

[Woody81]

Just as a quick update, I’ve discovered the primary (MOSFET switched) voltage is very low when connected to the transformer primary; around 5V peak to peak rather than 24V.

Any help welocome.

Thanks

[Jamie_S.]

Hi Woody,

Thank you for your post and welcome to the forums. Please could you attach your circuit schematic to a reply post, I can then simulate your circuit myself and make suggestions where necessary.

Many Thanks

[hafiz izhar]

hello,,i want to built push-pull inverter 12vdv to 240vac 50-60Hz vac using center tapped transformer but has a lot of error,,can u help me to fix it??