[chbot] Robotics Group meeting, Monday 19 Nov 2018, 630pm, 5 Idris Road

[Richard Jones]

The datasheet on the MOC3043M zero cross triac driver IC shows a snubber
with alternative value for inductive loads. You choose the values to
achieve critical damping if you can, just a little tricky if the load is
undefined.

My jlcpcb's arrived today, they have MOC3043M zero crossing drivers and
BTA41 triacs for mains switching with 1.5mm air gaps or >8mm pcb isolation
between traces which are re-enforced with 1mm copper wire for carrying 10A.
Sadly I will not have time to start fitting components until next Tuesday.

Richard

On Tue, Nov 20, 2018 at 5:15 PM Mark Atherton <markaren1 at xtra.co.nz> wrote:

> Here is a start on snubbers : https://en.wikipedia.org/wiki/Snubber with
> link to https://en.wikipedia.org/wiki/Arc_suppression
>
> For a mains application an X rated 0.1uF cap in series with 100R 1W
> resistor might be a good start (across contacts which need protection).
> This is for a slightly inductive load. Ambiguity indicates uncertainty,
> as in most cases...
>
> Anyone got any better rules-of-thumb on the subject ?
>
> -Mark
>
>
> On 20/11/2018 3:47 PM, Andrew Sands wrote:
> > Volker, you made mention was made of a 'power supply module', any
> further details available?
> >
> > Someone also mentioned a 'snubber' network when using  a triac - any
> pointers / data / URL?
> >
> > Thanks,
> > Andrew
> >
> > On Mon, Nov 19, 2018, at 22:26, Volker Kuhlmann wrote:
> >> The zero-crossing detector circuit I mentioned is here:
> >> https://www.circuitar.com/nanoshields/modules/zero-cross/
> >>
> >> Scroll down to the schematic link, which is a complete article
> >> describing the circuit.
> >>
> >>
> >> Mark could you post the opto isolator details please?? Ta.
> >>
> >> Volker
> >>
> >>
> >> --
> >> Volker Kuhlmann
> >> http://volker.top.geek.nz/   Please do not CC list postings to me.
> >>
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