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Pushpull snubbers in secondary side.

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cupoftea

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Hi,
The attached is two 300W pushpulls
24vin, 32vout, 300wout, 300khz.
One has the sec snub returned to the vout, other, to the GND.
Obviously , returning snub to vout is best.
Voltage reflected to the sec diodes is 24*(NShalf/NP)*2 = 96V.
So ideally, the sec snub would go from cathode to a 97V voltage source (eg capacitor charged up to 97V)…..however, that’s extra components.
For the flyback, the RCD clamp is a well known snubber…why , for the pushpull, is the “Diode/TVS to vout” not a well known snubber?
 

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  • 300WPushpull_snub_230106.pdf
    215.3 KB · Views: 84
  • pupull300w_snub_230106.zip
    5.1 KB · Views: 68

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