Bubba Oscillator as a sine wave inverter

[johnnyblaz97]

Hi there. I'm trying to make a sine wave inverter based on "Bubba Oscillator". The output of the bubba oscillator is a nice sine wave of 50Hz and 5V (rms). The problem arises when I try to step up the voltage to 220V using a transformer. The circuit doesn't simulate and the Multisim convergence error can't be fixed. Please help. Attached below is the bubba oscillator without the transformer.

[niarena · Accepted solution]

Those oscillators have a sensitive oscillating point, when I added the transformer and changed the ratio, it worked for a relatively low coil ratio and it became overdamped for higher coil ratios, it possibly saturates the circuit.

You may need to add a coupler/amplifier step to the circuit, besides that, the high voltage part needs to get its power from somewhere, so it will draw that power from the amps and it will definitely saturate them.