IGBT vs MOSFET

Discussion in 'General Electronics Chat' started by R!f@@, Oct 29, 2013.

  1. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    See the file attached.

    A seller said the MOSFET will work instead of the IGBT.

    App is a tread mill motor controller.

    I on the other hand does not think so. Correct me please.
     
  2. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    I don't know the answer. I don't see any reason why it wouldn't work. When I calculate watt loss both, assuming 20A tradmill motor, they are almost identical. I am curious why you think it won't work.
     
  3. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    I would say it is worth a try. They both have about the same switching times. And VGE versus VDS fully on looks also to be compatible
     
    R!f@@ likes this.
  4. ramancini8

    Member

    Jul 18, 2012
    442
    118
    IGBT:
    I=10A, P=21W
    soft recovery diode
    non-punch through
    short circuit capability (10Us)

    FET:
    I=10A, P=78W

    The IGBT seems to be a better choice, and that is why it is often preferred for motor applications.
     
    R!f@@ likes this.
  5. bertus

    Administrator

    Apr 5, 2008
    15,649
    2,348
    Hello,

    Perhaps the following PDF might interest you.

    Bertus
     
    R!f@@, tubeguy and MaxHeadRoom like this.
  6. ScottWang

    Moderator

    Aug 23, 2012
    4,857
    767
    MOSFET STP10NK80ZFP - V(BR)DSS=800V,RDS(on)=VGS=10V,Id=4.5A,0.78Ω.
    IGBT IRGIB10B60KD1 - VCES = 600V,IC = 10A,VCE(on)=1.7V.

    IGBT Calculation:
    R = 1.7V / 10A = 0.17Ω
    IGBT VCE(on) = 1.7V, when IC = 10A, W = 1.7V * 10A = 17W

    MOSFET Calculation:
    Vds = 4.5A * 0.78Ω = 3.51V, W = 3.51V * 4.5A = 15.795W
    IGBT to MOSFET Current rate = 10A/4.5A=2.222
    Vds = 3.51V * 2.222 = 7.8V
    W = 15.795W * 2.222 = 35.096W.

    The power dissipation rate of MOSFET to IGBT :
    PD_rate = 35.096W / 17W = 2.064

    If my calculation is right then the power dissipation of MOSFET is more than IGBT.
     
    R!f@@ likes this.
  7. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    You guys are right on. My calculation was out to lunch since I misread the datasheet and did math for 20A @ 0.09ΩRDSon
     
    R!f@@ likes this.
  8. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    So..this is new.

    Will it be safe to switch the IGBT for the MOSFET then ?
     
  9. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    Nah...not sure any more. I forgot to take the power dissipation into the consideration. It will most probably overheat. Due to insufficient heat sink. As the heat sinks are dimensioned for the IGBT. You should try to find a FET, which is as fast as the IGBT and RDS(on) around 0.17 ohm. Then one suggested will probably work for while then break down
     
  10. ScottWang

    Moderator

    Aug 23, 2012
    4,857
    767
    To see what I posted on #6, and another parameter that you should care about that is frequency.

    Comparing every parameters and considering what's your application, and then make the last decision.
     
  11. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Well. It's done. The customer said to put it. So it's upto him to blow it.
    Lessee what happens
     
  12. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Well! guess what?

    It ran for a half an hour without a load (Empty belt). But as soon as some one got on the belt it suddenly increased speed and KAPOW!
     
    Last edited: Nov 3, 2013
  13. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    Lol. So I guess there will be another experimental part exchange?
     
  14. R!f@@

    Thread Starter AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    The parts being brought from Malay soon. The original IGBT
     
Loading...