Re: triac mains switch

• To: tesla-at-pupman-dot-com
• Subject: Re: triac mains switch
• From: "Malcolm Watts" <malcolm.watts-at-wnp.ac.nz> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Wed, 23 Feb 2000 06:48:40 -0700
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi Jan,

> Original Poster: "Jan Florian Wagner" <jwagner-at-cc.hut.fi> 
> 
> Hi,
> 
> has anyone a tested&working schematic for a triac switch to switch on
> t.ex. a NST? 
> 
> I've built one, it looked and seemed so simple, but I can't help smoking
> one triac after the other when I remove my current limiting 1kW cloth
> iron. :(

What is the part number of the triac are you using?
 
> I've tried reducing dV/dt on switch-off (snubber: 40nF cap 1kOhm
> resistor, p=0.4..0.6), used triacs up to 800VAC and 10A, added and
> removed line filters. Also, before my last on-stock triac popped, I had a
> 10uF PFC cap accross my 220V 2.1A, 8kV 400VA rated NST (does 10uF sound
> reasonable, by the way?).

Could be bigger.  There have been formulae posted in the last 
couple of weeks. Check the archives. 
      
       What's this about a 2.1A rating?  Have you measured it? 

> Could you give me some tips on this triac thing? Or some alternative?
> 
> I don't want to use a relais, instead, opto-couplers & triac. No SCRs,
> they are too expensive here. Can I use diacs somehow for this?

Is a triac the cheapest switch you can get?

Regards,
Malcolm
 
> many thanks all!
> 
> --
> *************************************************
>  Jan Florian Wagner
>  high voltage at http://www.hut.fi/~jwagner
> 
> 
> 

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