[chbot] Triac snubber

[Mark Beckett]

Jasper
Here is the cct we used. (hope it goes thru the system)
it was used in Nightclub Lighting controllers, which were often 
switching inductive and not very nice loads.

I think we 'borrowed' the design from a commercial unit, after we cooked 
a few pin spot transformers.
The triac is an insulated one, which allowed bolting to the heatsink 
without insulation, hence you could earth the heatsink for safety.

Mark


Jasper Mackenzie wrote:
>>
>> I'm not sure of your application but would an off the shelf SSR work 
>> for you instead of building your own?
>  It looks like ppl are having similar trouble with some SSR's.... I 
> imagine it must only be _some_, but which 8)
> Just checked element14 and you can get them for as little as $10 for 
> 8A 240V. They still need a snubber. Interestingly the SSR datasheet 
> mentions that zero crossing SSR (and I assume triac/driver) combo will 
> not work well for loads with poor power factor... I wonder if this is 
> a problem with SMPS, not so much pf but the spikey nature of the current.
>  ok, this looks like an idea for the future. In the meantime I have 
> triacs etc...
>
> _______________________________________________
> Chchrobotics mailing list Chchrobotics at lists.linuxnut.co.nz
> http://lists.ourshack.com/mailman/listinfo/chchrobotics
> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> Web site: http://kiwibots.org
> Meetings 3rd Monday each month at Tait Radio Communications, 175 
> Roydvale Ave, 6.30pm
>
> When replying, please edit your Subject line to reflect new content.
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Triac Driver.png
Type: image/png
Size: 11962 bytes
Desc: not available
URL: <http://lists.ourshack.com/pipermail/chchrobotics/attachments/20130122/47008faa/attachment.png>