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From: "R. Lewis"
Subject: Re: Help with snubber circuits
Date: Fri, 13 Dec 2002 19:45:50 -0000
Organization: Nextra UK
NNTP-Posting-Date: Fri, 13 Dec 2002 19:43:59 +0000 (UTC)
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
"Paul Mathews" wrote in message
> "Jim_12" wrote in message
> > Hi,
> > I have a 240VAC lampflash unit with no snubbing on the relay
> > would like to add snubbing to this to reduce the EMI.
> > Can anyone help explain basic snubbing and any snubbing top tips.
> > The lamp is a 60w regular bulb and the unit flashes this at about once a
> > second.
> > Rds
> > Jim
> Probably the most effect thing you could do would be to switch the
> lamp on/off at zero crossings of the mains voltage. A simple way to
> do this would be to substitute a 'zero crossing switching' type of
> solid-state relay for the electromechanical relay you are currently
> However, you can also make the voltage change across the relay
> contacts less abrupt by paralleling the contacts with a capacitor.
> This will reduce some types of EMI. Use an X2 capacitor. You might
> try about 47nF. It's not true that the load has to be inductive
> (although there always is SOME inductance) to snub contacts.
> Paul Mathews
Probably the most effective thing you could do ..... to make this a very
dangerous set up..... would be to use a 47nF X2 cap as described above.
I wonder which regulation this doesn't break.
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