0
\$\begingroup\$

I read Basso's seminar, on Page 30, it is talking about Leakage Inductance Delays the Secondary Current. From the formula, we can get the Δt, but I am curious about one thing if we don't add the RCD clamp circuit in flyback (which mean we don't have Vclamp in the equation), how do I calculate the Δt. Any formula could replace it?

enter image description here

enter image description here

\$\endgroup\$
8
  • 3
    \$\begingroup\$ Calling @VerbalKint \$\endgroup\$
    – winny
    Commented Aug 1, 2022 at 16:28
  • \$\begingroup\$ Hi @Verbal Kint. Did you know that? \$\endgroup\$
    – Power JJ
    Commented Aug 2, 2022 at 4:21
  • \$\begingroup\$ I'm here : ) The time \$\Delta t\$, which is the leakage inductance reset time, depends on the clamp voltage and the reflected level which set the reset slope expressed in \$S_{leak}\$ (first line of the second slide). From there, you can calculate \$\Delta t\$ with the line below. In these expressions, you have references to the clamp voltage and hence the \$RCD\$ network selection. \$\endgroup\$
    – Verbal Kint
    Commented Aug 2, 2022 at 7:09
  • \$\begingroup\$ Hi @Verbal Kint, From your book, I know The time Δt, which is the leakage inductance reset time, but this is based on the Vclamp. I am curious about if I don't add any clamp circuit in flyback, can I know the Δt? in this situation I don't know the exact reset voltage on leakage inductance. that's why I ask. \$\endgroup\$
    – Power JJ
    Commented Aug 2, 2022 at 8:16
  • \$\begingroup\$ I see, the clamp will certainly be the MOSFET body diode which avalanches at the switch turn-off and it is not recommended. \$\endgroup\$
    – Verbal Kint
    Commented Aug 2, 2022 at 8:41

0

Reset to default

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Browse other questions tagged or ask your own question.