zero reverse recovery diode

Discussion in 'General Electronics Chat' started by TAKYMOUNIR, Oct 24, 2015.

  1. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
    351
    1
    pfc1.png what is the difference in wave form of Vds if D2 is zero reverse recovery and if has reverse recovery time.can some one please draw the wave form , and this effect on the ringing of the MOSFET ?.
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,014
    3,234
    Sounds like homework.
     
  3. TAKYMOUNIR

    Thread Starter Active Member

    Jun 23, 2008
    351
    1
    this is not a homework , this something I need to understand it, so can you please show what is the different in current and voltage of vds in both cases
     
  4. Papabravo

    Expert

    Feb 24, 2006
    10,144
    1,790
    This appnote has a pretty good explanation. A zero reverse recovery time is a physical impossibility, and although it can be made very short it just cannot be zero.

    http://www.vishay.com/docs/84064/anphyexp.pdf

    The effect of the non-zero reverse recovery time is that the diode will conduct in the reverse direction for some period of time. The characteristic is non-linear so the result will be distorted.
     
  5. MrAl

    Well-Known Member

    Jun 17, 2014
    2,433
    490
    Hi,

    The capacitance causes some ringing so you'll see ringing even with a small capacitance.
    The recovery mechanism is considered to be a different phenomenon. The shorter the recovery time the shorter the reverse current pulse will be through the diode.
     
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