Re: Push pull generator.

Body

Hello everyone,

I have continued to work on the pushpull converter and now have a frequency range of 37Hz to over 400Hz which is certainly sufficient for my heavy iron core transformer. Pulse width is adjustable from 780μs to 6ms at 37Hz. I think a lot can be experimented in this area.

Since I did not want to repeat the same mistakes as at that time, I concentrated strongly on the driver control and had to say if I increase the supply voltage for the mosfets at some point a point comes where there are dropouts after a long search, I took out the gate resistance at some point and the error with incandescent lamps was gone, now I am with 2 transformers as inductance testing and from now I increase the pulse width and a channel slowly starts to flicker, with lower voltage it is better again and the same current at higher frequency, it is also worse.

I have also hung ferrite beads on the gate lines and had a super clean signal but with very small pulse width, the signal collapsed, the ferrites seem to act as gate resistors, unfortunately there are no small pulse widths to produce

I soon have the feeling that the low voltage supply does not create or am I wrong.

Mosfets are IXFN44N100P

The mosfets are very hot despite the large heat sink at just 4 amps although they are designed for 37 amps per Mosfet I find that very strange.

Best regards

Sven