IGBT vs MOSFET

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

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  1. Oct 29, 2013 #1
    R!f@@

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    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.
     
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  2. Oct 29, 2013 #2
    strantor

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    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.
     
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  3. Oct 29, 2013 #3
    t06afre

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    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
     
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  4. Oct 29, 2013 #4
    ramancini8

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    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.
     
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  5. Oct 29, 2013 #5
    bertus

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    Hello,

    Perhaps the following PDF might interest you.

    Bertus
     
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  6. Oct 29, 2013 #6
    ScottWang

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    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.
     
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  7. Oct 29, 2013 #7
    strantor

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    You guys are right on. My calculation was out to lunch since I misread the datasheet and did math for 20A @ 0.09ΩRDSon
     
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  8. Oct 30, 2013 #8
    R!f@@

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    So..this is new.

    Will it be safe to switch the IGBT for the MOSFET then ?
     
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  9. Oct 30, 2013 #9
    t06afre

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    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
     
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  10. Oct 30, 2013 #10
    ScottWang

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    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.
     
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  11. Oct 30, 2013 #11
    R!f@@

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    Well. It's done. The customer said to put it. So it's upto him to blow it.
    Lessee what happens
     
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  12. Nov 3, 2013 #12
    R!f@@

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    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
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  13. Nov 3, 2013 #13
    strantor

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    Lol. So I guess there will be another experimental part exchange?
     
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  14. Nov 3, 2013 #14
    R!f@@

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    The parts being brought from Malay soon. The original IGBT
     
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