Solid State Relay

Discussion in 'The Projects Forum' started by mattd860, Jan 22, 2016.

  1. mattd860

    Thread Starter Member

    Jan 9, 2016
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  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    What do you want to switch?
    What voltage will be used?
    Is the voltage AC or DC?
    What is the current to be switched?
    Is there a changeover contact needed?

    Bertus
     
  3. mattd860

    Thread Starter Member

    Jan 9, 2016
    57
    2

    Answers above. Thanks!
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Crydom, Opto22 et-al sell 3-35v DC input SSR's with AC output switching.
    Max.
     
  5. mattd860

    Thread Starter Member

    Jan 9, 2016
    57
    2
    Sorry I definitely wasn't clear in my first post. I thought the picture in the link was better. The relay needs to be a 5v dc input with a 0-30v dc output.
     
  6. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Same goes.
    Max.
     
  7. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    So you want to use 5VDC to switch a 30V-coil relay to ground? Why not just a logic-level an N-MOSFET? Or do you need isolation between the 5V and the relay circuit?

    Ken
     
  8. Lestraveled

    Well-Known Member

    May 19, 2014
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    Look for an ODC5 opto-isolated relay. It is made by a lot of people. (google ODC5).
     
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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    @KMoffett He stated he did not want to hear the relay!
    Max.
     
  10. mattd860

    Thread Starter Member

    Jan 9, 2016
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    2

    that is basically what I'm doing now with the relay shown in my first post. I would like to eliminate the relay and I like your idea of using the mosfet instead. I could theoretically just use a small capacitor but I'm able to use a protecting diode by the 2nd relay. The 2nd relay coil receives 12-14 volts and I wanted to ground the coil with an output from my Arduino board - but again I cannot use the diode. This is why I'm using the 1st relay (seen in the amazon link above) in between the 2nd relay and the Arduino because I'm able to access that circuit to modify it.
     
  11. KMoffett

    AAC Fanatic!

    Dec 19, 2007
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    I'm not understanding how you intend (theoretically) use a capacitor to switch the 2nd relay with an Arduino output. Maybe you could post a sketch?

    Ken
     
  12. mattd860

    Thread Starter Member

    Jan 9, 2016
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    00Akl.png

    The common on this relay goes to ground. The NO pin will go to the ground pin on the 2nd relay which will ground the coil.

    I want to replace the relay in the picture above with something quieter.
     
  13. MaxHeadRoom

    Expert

    Jul 18, 2013
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    If you are switching 30vdc with the Arduino, why not use a logic level Mosfet, no relay?
    Max.
     
  14. mattd860

    Thread Starter Member

    Jan 9, 2016
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    I will study up on the mosfet. I learning as I go here. Can you provide a wiring diagram as an example?
     
  15. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    You said the 2nd relay has a 12 V DC coil. What is the manufacturer / model number / coil resistance / coil power of the *second* relay. This will determine the correct MOSFET to replace the first relay. Also, is it possible to replace that relay with a solid state relay to eliminate its clock? What is the power being switched by the second relay (open circuit voltage and load current)?

    ak
     
  16. MaxHeadRoom

    Expert

    Jul 18, 2013
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    The IRL530 is a high current logic level mosfet.
    This pdf may show interfacing ideas.
    Max.
     
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