Re: snubber resistor power rating?
From: Arie de Muynck (send.spam.to_at_spammer.org)
Date: 11/28/04
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Date: Sun, 28 Nov 2004 10:54:46 +0100
AAArrghhh...
OK, here's the right drawing:
"Arie de Muynck" ...
>
> Ken Smith" ....
> > Is this what we are dealing with here:
> > ...
> > If so, how does the [triac] get turned off with a current flowing in the
> load?
>
> No. It is:
L (mainly inductive load)
---------UUUU---------------------------
^ | |
! | /
! | \ R
! | /
Mains | \
! ----- |
! A V Triac |
! ----- ___
! Trigger ckt----/ | ___ C
V | |
----------------------------------------
> The triac turns off at the zerocrossing of the current through it. Since
the
> mains voltage will be about maximum then, the snubber limits the slewrate,
> preventing the turnon by excessive dV/dt.
> The resistor provides damping of the turnoff efect. It also limits the
> current when the triac fires at turnon:
> I(pk) = Vmains(pk) / R
> and this discussion is about how a 2W 47 Ohm resistor likes that hefty
> spike...
>
> Regards,
> Arie de Muynck
>
>
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