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Recent content by Velkarn

  1. V

    Inductor core loss calculator is wrong?

    simple calc gives conduction loss: 0,1W for nominal dcr, 0,12W for max dcr 1653985345 so 0.05 to 0.03 for core loss
  2. V

    Need information regarding DC Pulsed supply

    hi! from the referenced power supply datasheet i can presume that the indicator of arc ignition is voltage change
  3. V

    4kW LLC converter with split secondary windings?

    as i understand, you construction is core-pri-sec-sec-pri, right? what is the purpose of winding interleaving? for LLC leakage inductance is not issue, so why not pri-sec?
  4. V

    4 5x20mm Fuses in parallel for 4kW PSU?

    for cheaper components look at asian brands this one
  5. V

    CCM offline flyback not that bad

    i think its not only efficiency, moving to CCM lead to EMC issue
  6. V

    How to estimate whether this fuse can handle power supply cold starts?

    what to do: 1 measure inrush current shape 2 calculate I2t of this pulse using this guide 3 compare calculated value with I2t value of fuse from datasheet
  7. V

    PSFB output voltage stabilization issue

    can u explain pls, how do you calculate this values?
  8. V

    [SOLVED] PSFB current sensing

    R72 helps to demagnetize the CT. Recommendation is R72=100*R74 as i remember. why you put 20k? 1626619416 is the R73,C62 time constant ok for used freq?
  9. V

    Any special avalanche capable/rated mosfets

    hi! Here is first opend mosfet from infineon. there is single and repetetive avalanche rating. and "Application (Flyback) relevant avalanche current, single pulse" rating, dont know what is this - first seen by me
  10. V

    How much does an aluminium enclosure wrapping improve the Radiated EMC test?

    Hi! from my expirience in EMC testing of power supply with and without aluminium case, ps in case produces less conductive emi, cant remember numbers, but significant. So i think, in radiated emi will be the same
  11. V

    What countries don't need PFC for offline SMPS >75W?

    in Russia the copy of IEC 61000-3-2 standart is active
  12. V

    Ferrite materials used for offline Flyback converter

    there is tool from Epcos - Magnetic Design Tool
  13. V

    Pspice AC analysis of converter problem

    its possible if average model is used
  14. V

    Radiated emissions from cable out of enclosure....solve with shielded cable?...or 3 core cable with earth?

    this is better, i think some "tricks" from my experience in emc-lab: 1 low power led-driver (flyback ) - putting 50-100pF capacitor at drain-source of power mosfet - lowering radiated and conducted emi 2 cable filter(a kind of zcat1325) at input and/or output cable - lowering radiated and...
  15. V

    Offline 20W Flyback SMPS failing QP radiated emissions at peaks 57MHz to 184MHz

    try to look at output diode and power MOSFET source-drain and measure the freq of oscillations at this points, is any correlations with peaks
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