8051 compatible SSR

Discussion in 'Embedded Systems and Microcontrollers' started by Anirban Raha, Oct 18, 2014.

  1. Anirban Raha

    Thread Starter Member

    Dec 4, 2013
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    Hi,
    I'm planning on using a Solid State Relay to switch a max. load of 5A, 230V. Can 8051 uC be coupled directly to a Solid State Relay? Or do I need some driving circuitry?
    Please suggest a suitable SSD IC for this purpose(having both NO and NC contacts)
    Thank you...:)
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I believe you will need to wind your own for both states, most off the shelf SSR's are single output.
    But they do come with 3v-35v input.
    Max.
     
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  3. Anirban Raha

    Thread Starter Member

    Dec 4, 2013
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    If they come with 3-35V input, then 8051 with a 5V output should be able to drive them directly?
    Actually, I'm planning on eventually operating an electro-mechanical relay/contactor(230V AC coil voltage) with this circuit so that I may be able to switch loads of a much higher current rating. Any better and cheaper way to achieve this?
     
  4. MrChips

    Moderator

    Oct 2, 2009
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    If you plan on using an AC relay in any case, then you're ok.

    Simply drive the relay coil from the SSR.
     
  5. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Unless the SSR is zero crossover switching you may need to fit a R/C snubber across the coil.
    Max.
     
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  6. Anirban Raha

    Thread Starter Member

    Dec 4, 2013
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  7. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Yes, but when rapid on/off switching, switch ON through Zero is often used.
    Max.
     
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  8. Anirban Raha

    Thread Starter Member

    Dec 4, 2013
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    And how do i acheive that? Simply by switching when voltage across snubber is zero?
     
    Last edited by a moderator: Oct 19, 2014
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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