Triac & Optopcoupler

Discussion in 'General Electronics Chat' started by cheesemunger, Feb 14, 2009.

  1. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    Ok,

    I having trouble getting my head around this. Lets say I get
    a MOC3010M or similar, what else do I need (minimum requirements) for AC control with a microcontroller such as an Arduino. I have been told I need another TRIAC but doesn't it have one inside??

    Cheesemunger

     
  2. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    Thanks very much, I will try that.
     
  3. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    If I use that circuit to control the lights in my room can I use it to do dimming or just on/off. I think its on/off but I'm not sure.
     
  4. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Depends on the type you use.
    The MOC301X and MOC302X are direct acting.
    The MOC304X has a zero crossing detector.

    See the datasheets.

    Greetings,
    Bertus
     
  5. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    I don't understand zero crossing detector or direct acting????
     
  6. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    With direct acting I mean, when the led in the optocoupler is activated the diac will trigger.
    (this can be used as a dimmer).
    With zero crossing I mean, when the led in the optocoupler is activated, the diac wil wait until the next zero crossing to be activated.
    (this can be used as a switch only).

    Greetings,
    Bertus
     
  7. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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  8. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    No, The IL410 has a zero crossing detector.
    The IL420 ia direct acting.

    See the datasheets.

    Greetings,
    Bertus
     
  9. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    Ok thanks for explaining that.
     
  10. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    and the Q8016LH6 will be fine for both?
     
  11. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    The Q8016LH6 is a 16 A 800 Volts triac.
    It needs 80 mA gate current.
    The IL410 and IL420 can deliver 300 mA gatecurrent, so I expect it will work.

    Greetings,
    Bertus

    Attached datasheet for the Q8016LH6
     
  12. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    Thats great :)
     
  13. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    Alberto: In the circuit you posted, what are the capacitors and resistors for? Are they really needed?
     
  14. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    bump bump ???
     
  15. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    Can you give me the maths got the 180 Ohms?
     
  16. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    Ok so here is my maths to get my resistor value for IL410/IL430.

    120 x 1.414 = 170 V, so R = 170 V / 3 A = 56 ohms minimum.

    3 amp being the ITSM of the optocoupler
     
  17. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    I think I've got it wrong
     
  18. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    You know what, I'm gonna start with 180 and go down in values until it works.
     
  19. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    Here is a peace of text from the site alberto gave:

    Greetings,
    Bertus
     
  20. cheesemunger

    Thread Starter Active Member

    Jan 25, 2009
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    I don't really understand that? I apologise if I'm being too much trouble.
     
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