half bridge inverter x inductive loads

[falcosms]

**broken link removed**Hi all

I make a circuit with a converter push pull 12V to +150/-150V who works very well.

after this, i make a half bridge inverter with sg3525 and optcouplers.

ths circuit works good with linear loads (lamps and resistances), but if i put a transformer ou voltage variable transformer, the output not is good, like this image:

**broken link removed**

my inverter circuit is this:

**broken link removed**

anybody knows a way to clean the modified sine wave with inductive loads?

yours trully

Marcelo

 

[BradtheRad]

An inductor is able to generate EMF which may exceed instantaneous supply V. It's a side effect of the inductor's current lag.

One or both of these effects could be kicking back to your inverter circuit. Perhaps it even gets back to your control circuit and throws the waveform out of kilter?

Another possibility is because you're sending a modified sine wave into an inductor. This means square pulses, doesn't it? Might produce ringing. Or resonance. Or counter-EMF. Etc.

 

[ch wazir]

send the diagram then i'll be able to answer your problem in detail/