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Recent content by wky

  1. W

    flyback converter and related transformer issues

    Lkp and Lks are not diectly measurable but deducible from other measuremnts (OK based on a T-model). Without revisiting Dixon's paper, if we take the self inductance as (leakage inductance + magnetizing inductance), then for primary , Lp = Lkp + Lm = N^2/Rp, secondary, Ls = Lks + Lm = N^2/Rs...
  2. W

    flyback converter and related transformer issues

    FvM, my own answer to my question is a NO, and may be YES in very special cases. Also I don't think this has something to do with equivalent circuits. (I understand that there can be different equivalent circuits to describe the behaviour of a real component, they being 'equivalent' to each...
  3. W

    [SOLVED] Getting Loop Gain of Boost Converter with UC3843 controller using SIMetrix software

    kanmaedexandzelbladex, the circuit you are simulating is a switched model, not SSA model.The former should be more accurate especially at high frequencies. Accuracy of conventional SSA upto Nyquist frequency ,i.e. 1/2 of switching frequency, is questionable. It is topology dependent, some are...
  4. W

    [SOLVED] Getting Loop Gain of Boost Converter with UC3843 controller using SIMetrix software

    I think normally we are only interested in responses upto 1/2 of the switching frequency, beyond which we usually ignored. Refer to your last Simplis simulation results, looks like your switching freq. is about 110KHz, manifested by a dip of the gain curve and a zig-zag of the phase curve at...
  5. W

    flyback converter and related transformer issues

    FvM, thanks for the reply. If the measured leakage inductance Lk is measured at the primary with secondary shorted, we have Lk = Lkp + (Np/Ns)^2 *Lks , Lpk and Lks being respectively the primary and secondary leakage inductances, The primary self inductance Lp = Lkp + Lmag Per your saying, Lkp =...
  6. W

    flyback converter and related transformer issues

    FvM, you said self-inductance of a winding = magnetizing inductance/mutual inductance + 1/2 * leakage inductance? Why 1/2 ?
  7. W

    Output voltage undershoot in flyback based power supply

    Could it be a measurement problem ? Such as noise pickup by the scope probe ?
  8. W

    flyback converter and related transformer issues

    2) Yes, the magnetizing inductance is also the mutual inductance.
  9. W

    Effect on Capacitance

    And what kind of water. Ion-free or it will conduct.
  10. W

    buck inductor current measurement

    Use a current probe
  11. W

    Meaning of BJT Vce(sat)

    bjt vce sat Vce(sat) is analogous to Vds(sat)
  12. W

    Looking for materials about RCC circuit

    rcc flyback The first thing is the understanding of flyback converter theory because RCC is just a variable frequency flyback circuit. Added after 17 minutes: May be the following paper is helpful :
  13. W

    need help of solving spike Vg induced by Vd on MOSFET.

    voltage spike get rid Pararell a resistor to g and s
  14. W

    Orcad PSpice Schematics v.10.5 problem

    alssrvrvc6.dll Thanks for the reply. Have tried renaming alssrvr.dll to alssrvervc6.dll. The program can be invoked, but still can't run.
  15. W

    Orcad PSpice Schematics v.10.5 problem

    orcadfnc.dll Has anyone successfully installed Schematics 10.5 which can be downloaded from Orcad's website ? Got an error warning saying "alssrvrvc6.dll missing" . Anyone has the same problem ?

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