
Yes, but when I say random, that concern the firing mode
of the triac because with a zero crossing mode SSR, the
triac is firing at the next zero crossing after the input
command signal and with a random mode SSR, you can firing
the triac in any moment on the AC power phase.
So, because I will use the triac ( or the SSR ) for a dimer
configuration, I need firing the triac in any moment
on the AC power phase ( to be able to control the quantity of power sent to the load ).
About the snubber and the choke:
- in reality, the use of the snubber circuitry depend of the triac used ( is dI/dt characteristic ) but some triacs
( also called snubber less triacs ) no need a snubber.
Please, look here:
- and for the EMI radiations and the harmonics on the main,
I believe that it is preferable to use a choke in serie with the load.
So, please excuse my bad English => I hope that I have been clearly ??? ;-)