[Diy_efi] IGBT for coil driver?

[Bevan Weiss]

You might want to check out the data sheet for the IGBT, it may already have
a reverse protection diode, you would have to make sure that it would be
suitable however.  It is unlikely that the breakdown voltage of the IGBT
would be enough (on its own) to withstand the collapse of the ignition coil
(of course this would depend on the saturated current in the coil, and the
inductance of the coil).  This means that it would be wise in any case to
use a seperate diode to relieve the IGBT of the inductive kick when you
switch off the current.

----- Original Message -----
From: "Tomas Sokorai Sch." <tsokorai at xperts.cl>
To: <diy_efi at diy-efi.org>
Sent: Tuesday, July 09, 2002 3:11 AM
Subject: [Diy_efi] IGBT for coil driver?


> Hi guys!
>
> Is there a problem in using a *BIG* (70A) IGBT (irg4pc50f) for a coil
driver
> in a ignition, using an old (oil filled, Duraspark) coil?
> Is a protection diode really needed between the IGBT with this size of
> transistor ?
> I don't want to fry my IGBT because I have only 1 and it is unavailable in
my
> city and a hassle to get :)
>
> Thanks
>
> Tomas
>
>
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>

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