Timeline for Is a Zener diode or a TVS diode more suitable in this application?
Current License: CC BY-SA 4.0
5 events
| when toggle format | what | by | license | comment | |
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| Jul 29 at 17:45 | comment | added | Tim Williams | (RCD peak clamp snubber is fine, it just needs to be dimensioned for maximum output, since the clamp voltage varies with power level.) | |
| Jul 29 at 17:44 | comment | added | Tim Williams | A lone rectifier diode would destroy most or all of the high voltage output. A zener in series with a rectifier, or a zener across the transistor, absorbs excess energy without reducing secondary voltage nearly as much. "Zener" and "TVS" (of the generic/unqualified zener/avalanche diode type) are identical as far as I know, with manufacturer-approved applications (i.e. peak ratings) being the only differentiator. | |
| Jul 29 at 17:11 | comment | added | Marcus Müller | it's not! The stored energy is generally transported to the secondary side; that's how the flyback supply works, after all. What you do get is the inductive kickback from the transformer leakage, and you classically try to store that current in the snubber capacitor, through the diode. | |
| Jul 29 at 17:06 | comment | added | 16-bit-apps | Can you please explain? Doesn't the high voltage output of the flyback transformer (more than you'd get if you drove it with a sine wave) happen because of the high voltage induced in the primary when it switches off? Sorry it is probably a very stupid question... | |
| Jul 29 at 17:01 | history | answered | Marcus Müller | CC BY-SA 4.0 |