It seems to be the snubber network doesn't suppress the ringing as I intended. Am I right? I took a shot from mosfet's drain
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Didn't change much.22Ω is a bit high. A good first choice is the same value as the load, about 1Ω.
The drain waveform should be a squarewave, amplitude 24V, if the transformer is correct.
It doesn't take much. Around 0.1~ 0.2 A.With no load on the output, how much current is the circuit taking?
Can I also add a choke to avoid back emf to battery?1) You should check the ESR factor of this cap. Thermal flux in Watts is i^2*ESR.
2) You should parallel it with few 0.1 mkF fast caps to avoid the rapid pulses overstressing it by the di/dt
overvoltages are due to a parasitic inductance in the transformer, so it is normal to have these spikes however you must not add more with the layoutI have applied a snubber network across the mosfets according the steps in the link down below. It reduced the ringing a lot but the amplitude of the peaks still remain the same. Have any idea how to reduce the amplitude as well?
https://e2e.ti.com/blogs_/b/powerhouse/archive/2016/05/05/calculate-an-r-c-snubber-in-seven-steps
by Jake Hertz
by Duane Benson
by Jake Hertz