Re: X10 signals can be TOO strong!

[Marc_F_Hult <MFHult@xxxxxxxxxxxxxxxxxxxxx>]

On 14 Dec 2006 21:46:02 GMT, ddl@danlan.*com (Dan Lanciani) wrote in message
<1335298@xxxxxxxxxxxxxxxxxxx>:

>In article <qtdgh.203122$Fi1.110592@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
JeffVolp@xxxxxxx (Jeff Volp) writes:
>| "Alan Vogel" <avogel2@xxxxxxxxxxxxx> wrote in message
>| news:6e5gh.30252$wP1.27181@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>| > It looks like the 30Vpp signals that appear on the MT1 and MT2 pins of the
>| > triac are exceeding the triac's dV/dt spec.  These signals capacitively
>| > couple to the triac's gate and turn it on.  Sensitive gate triacs
>| typically
>| > have higher dV/dt limits, but are probably not used in the modules because
>| > they are more expensive.
>|
>| That makes sense.  The inductor in series with the triac should limit the
>| dV/dt, but perhaps not enough.  I recall Insteon had to change an inductor
>| to resolve their flicker problem.  I don't understand why this seems to
>| effect modules running near their maximum load.
>
>Perhaps the heavier the load the greater the amplitude of the carrier
>across the triac?
>
>				Dan Lanciani
>				ddl@danlan.*com
>

Another possibility is saturation of the inductor core at high currents.

... Marc
Marc_F_Hult
www.ECOntrol.org