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| Film cap across bridge rectifier and new "soft" diodes |
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| 001:
Film cap across bridge rectifier (or diodes) was common in XX century The idea is RF and on-off noise suprestion, isn`t it? Is it still necessary with new "soft" diodes? |
| The Doktor:
What is a "soft" diode? Are you referring to an active rectifier that uses an FET? |
| 001:
--- Quote from: The Doktor on December 10, 2018, 12:23:30 pm ---What is a "soft" diode? Are you referring to an active rectifier that uses an FET? --- End quote --- No! |
| T3sl4co1l:
It's always necessary given a worse enough circuit. So, it depends. Is this for mains rectification? Barely matters (even with all the inductance in a transformer). BTW, an R+C is the better solution, sized to dampen the stray inductance. Often C was used, giving suboptimal damping (most often what happens is, it still rings, but with a smaller step, lower amplitude, and much lower frequency, probably good enough not to be a problem). Tim |
| coppercone2:
I don't really understand this. Is a soft diode slower then a fast diode? So we have moved to using more lossy diodes to prevent EMI problems? Is this something really old like comparing gallenium rectifiers to silicon ones? Are you preventing RFI rectification by shunting the diodes at high frequencies to prevent even higher frequencies from being spawned/favorably chaining PSD? Don't you want that stuff turned into high frequencies as much as possible so its easier filtered? Or is it more likely to cause problems if it gets into the circuit in the first place? Does this have anything to do with transformer shunting with capacitors like I have seen once? Perhaps to bypass its mixing nature? |
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