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Switching Current Spikes?

Discussion in 'Power Electronics' started by emaq, Mar 31, 2019.

  1. emaq

    emaq

    2
    0
    Sep 17, 2015
    For the dc-dc converter circuit and waveforms attached, I have the following questions for the switching current spikes. The implementation detail is as under.

    Switching Frequency: 100 kHz
    Duty cycle: 80 %
    MOSFETS are driven by MC33152 (https://www.onsemi.com/pub/Collateral/MC34152-D.PDF) with 6.5 V peak voltage.
    MOSFET: IRFP260N
    Average switch current: 12 A
    1st (top) waveform: switch S1 current
    2nd waveform: switching signal for switch S1
    3rd (bottom) waveform: switching signal for switch S2

    1) Why these current spikes appear in the switch current? Are they usual or unusual? Any IEEE reference in past 5 years that have discussed the origin of these spikes.
    2) How these current spikes can be reduced, if the actual reason is known?

    BTW, the drain-source voltage waveform of switch S1 is clean (no apparent voltage spikes).
     

    Attached Files:

  2. Bluejets

    Bluejets

    3,453
    698
    Oct 5, 2014
    wow....12A at 100khz.....some switch.
    What is it driving or is this all purely theory.??
     
  3. WHONOES

    WHONOES

    663
    134
    May 20, 2017
    What exactly are you trying to do?
     
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