Re: X10 signals can be TOO strong!

[ddl@danlan.*com (Dan Lanciani)]

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