| ??? 07/13/04 21:55 Read: times Msg Score: -1 -1 Message Not Useful -1 Offensive/Flame +1 Underrated |
#74201 - This is the fundamental flaw Responding to: ???'s previous message |
Prahlad J. Purohit said:
A triac once triggered its fully ON and there is nothing like turning ON slowly. Prahlad has thus identified the fundamental, fatal flaw in this scheme. :-( A Triac (like an SCR or Thyristor) is a Triggered device - it is either triggered or it isn't; it is either conducting or it isn't. A Triac does not have a linear region - as would be required for this scheme. :-( Sorry, but that's just the nature of the beast. Even if it were possible, this slow ramp-up would greatly increase the power dissipation - and dealing with that would certainly negate any savings in avoiding zero-cross detection (if, indeed, there are any at all). Anyway, it's good to have ideas and throw them open to discussion like this - hopefully you've at least learned something about triacs! After all, how many failures did Edison have before he actually got his lightbulb working...? ;-) |
