J
jodleren
Hi all!
I am educated within eletronics, but that is 10 years ago. I have been
working on a simple controller, which should turn on/off a 12VAC/1A
(10W) line. For that I use an optocoupler and and a TRIAC. (before
anyone asks - the 12VAC is not my call).
It has to open 5 (1-9) times per second.
I found this:
http://www.mikrocontroller.net/attachment/6315/Triac.jpg
(from: http://www.mikrocontroller.net/topic/19355)
My german is rusty too, so here it goes:
I simply have a 1K resistor instead of those 2 and that is all.
Could anyone explain me the idea of:
a) the RC on the right?
b) the 47nF condensator?
Noise reduction?
Next, I have a question regarding the optocouplers:
Currently I use IL420 (IL4208) from Infineon. Using that it works.
But S21ME4 from Sharp does not - it turns slightly on. Then again, the
datasheets (from www.elfa.se) says "For triggering medium/high power
triac".
As much as I read about it, the S21ME4 is cheaper, and may be able to
drive the line alone, though I am not sure. It is also ~4 times
cheaper than IL420. Maybe the ME3 (without zerocross detector may
work?)
I am wondering whether it does not work @ 12V.
But using a IL420 and BTA06 triac it works.
I have a solution, I just want to know why it works as it does
BR
Sonnich Jensen
I am educated within eletronics, but that is 10 years ago. I have been
working on a simple controller, which should turn on/off a 12VAC/1A
(10W) line. For that I use an optocoupler and and a TRIAC. (before
anyone asks - the 12VAC is not my call).
It has to open 5 (1-9) times per second.
I found this:
http://www.mikrocontroller.net/attachment/6315/Triac.jpg
(from: http://www.mikrocontroller.net/topic/19355)
My german is rusty too, so here it goes:
I simply have a 1K resistor instead of those 2 and that is all.
Could anyone explain me the idea of:
a) the RC on the right?
b) the 47nF condensator?
Noise reduction?
Next, I have a question regarding the optocouplers:
Currently I use IL420 (IL4208) from Infineon. Using that it works.
But S21ME4 from Sharp does not - it turns slightly on. Then again, the
datasheets (from www.elfa.se) says "For triggering medium/high power
triac".
As much as I read about it, the S21ME4 is cheaper, and may be able to
drive the line alone, though I am not sure. It is also ~4 times
cheaper than IL420. Maybe the ME3 (without zerocross detector may
work?)
I am wondering whether it does not work @ 12V.
But using a IL420 and BTA06 triac it works.
I have a solution, I just want to know why it works as it does
BR
Sonnich Jensen
