Building a solid state relay module

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  • EasyGoing1
    Shock Therapist
    • Sep 2016
    • 977
    • USA

    #1

    Building a solid state relay module

    So they sell these on Amazon pretty cheap:



    I looked at the different pics that they post from different angles and I got all of the values of the components on the circuit board, but I'm obviously not exactly sure what the schematic would look like so I came up with this:



    But, I'm not exactly sure that it will work, or even if my configuration of the components makes sense in terms of a "stable" circuit given the desired function of it ... I have all of the components but I'm wondering if anyone can take a quick look at my schematic and offer any comments? The power source is 5V
    sigpic
  • R_J
    Badcaps Legend
    • Jun 2012
    • 9514
    • Canada

    #2
    Re: Building a solid state relay module

    Here is a similar device with schematic http://wiki.sunfounder.cc/index.php?..._Trigger_Relay
    Solid state relay using a mechanical relay?
    These are SSR as an example
    Attached Files
    Last edited by R_J; 09-17-2018, 12:16 PM.

    Comment

    • EasyGoing1
      Shock Therapist
      • Sep 2016
      • 977
      • USA

      #3
      Re: Building a solid state relay module

      Originally posted by R_J
      Here is a similar device with schematic http://wiki.sunfounder.cc/index.php?..._Trigger_Relay
      Solid state relay using a mechanical relay?
      Interesting ... ill play with it on a breadboard and see what I can come up with.

      Thank you!
      sigpic

      Comment

      • EasyGoing1
        Shock Therapist
        • Sep 2016
        • 977
        • USA

        #4
        Re: Building a solid state relay module

        Originally posted by R_J
        Here is a similar device with schematic http://wiki.sunfounder.cc/index.php?..._Trigger_Relay
        Solid state relay using a mechanical relay?
        These are SSR as an example
        So here's something interesting ... on the other side of the relay, I have a separate 6v source connected to a resistor and an LED ... and when I bias the transistor, the relay switches on and the LED lights up through that separate power source, but when the transistor goes off, the relay doesn't open ... its like it just stays latched ... even if I disconnect the input of the relay and bring both pins to ground, it sill allows current to flow through the relay until I disconnect one of the output pins, where it will stay disconnected until the inputs of the relay are brought high again. I have several of those relays and I tested a few of them and they all exhibit the same behavior.
        sigpic

        Comment

        • budm
          Badcaps Legend
          • Feb 2010
          • 40746
          • USA

          #5
          Re: Building a solid state relay module

          What is the spec of the relay/ What is on the output side TRAIC, SCR, Transistor? If they are TRAIC or SCR, they will latch on since those kind of outputs are made for AC.
          Never stop learning
          Basic LCD TV and Monitor troubleshooting guides.
          http://www.badcaps.net/forum/showthr...956#post305956

          Voltage Regulator (LDO) testing:
          http://www.badcaps.net/forum/showthr...999#post300999

          Inverter testing using old CFL:
          http://www.badcaps.net/forum/showthr...er+testing+cfl

          Tear down pictures : Hit the ">" Show Albums and stories" on the left side
          http://s807.photobucket.com/user/budm/library/

          TV Factory reset codes listing:
          http://www.badcaps.net/forum/showthread.php?t=24809

          Comment

          • EasyGoing1
            Shock Therapist
            • Sep 2016
            • 977
            • USA

            #6
            Re: Building a solid state relay module

            I just did a google and apparently the relay requires the voltage at the output to go to zero before it switches off ... so it can only drive an AC load
            sigpic

            Comment

            • budm
              Badcaps Legend
              • Feb 2010
              • 40746
              • USA

              #7
              Re: Building a solid state relay module

              Yep.
              Never stop learning
              Basic LCD TV and Monitor troubleshooting guides.
              http://www.badcaps.net/forum/showthr...956#post305956

              Voltage Regulator (LDO) testing:
              http://www.badcaps.net/forum/showthr...999#post300999

              Inverter testing using old CFL:
              http://www.badcaps.net/forum/showthr...er+testing+cfl

              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
              http://s807.photobucket.com/user/budm/library/

              TV Factory reset codes listing:
              http://www.badcaps.net/forum/showthread.php?t=24809

              Comment

              • EasyGoing1
                Shock Therapist
                • Sep 2016
                • 977
                • USA

                #8
                Re: Building a solid state relay module

                Originally posted by budm
                What is the spec of the relay/ What is on the output side TRAIC, SCR, Transistor? If they are TRAIC or SCR, they will latch on since those kind of outputs are made for AC.
                I wonder what would happen if I used it to switch on a circuit that is pulse width modulated ....
                sigpic

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Building a solid state relay module

                  Current has to drop to 0 (or Less than Holding current) for it to be off.
                  https://cdn.badcaps-static.com/pdfs/...758642a941.pdf
                  Last edited by budm; 09-17-2018, 01:44 PM.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • EasyGoing1
                    Shock Therapist
                    • Sep 2016
                    • 977
                    • USA

                    #10
                    Re: Building a solid state relay module

                    Originally posted by budm
                    Current has to drop to 0 for it to be off.
                    which would the be the case with PWM ... although the frequency is much higher than an standard 60Hz AC signal ... wonder how fast those triacs are
                    sigpic

                    Comment

                    • EasyGoing1
                      Shock Therapist
                      • Sep 2016
                      • 977
                      • USA

                      #11
                      Re: Building a solid state relay module

                      Originally posted by budm
                      Current has to drop to 0 (or Less than Holding current) for it to be off.
                      https://cdn.badcaps-static.com/pdfs/...758642a941.pdf
                      Didn't work ... at least not with an arduino PWM source from an analog pin
                      sigpic

                      Comment

                      • budm
                        Badcaps Legend
                        • Feb 2010
                        • 40746
                        • USA

                        #12
                        Re: Building a solid state relay module

                        You need SSR DC output (I.E. MOSFET) if you want PWM output.
                        Never stop learning
                        Basic LCD TV and Monitor troubleshooting guides.
                        http://www.badcaps.net/forum/showthr...956#post305956

                        Voltage Regulator (LDO) testing:
                        http://www.badcaps.net/forum/showthr...999#post300999

                        Inverter testing using old CFL:
                        http://www.badcaps.net/forum/showthr...er+testing+cfl

                        Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                        http://s807.photobucket.com/user/budm/library/

                        TV Factory reset codes listing:
                        http://www.badcaps.net/forum/showthread.php?t=24809

                        Comment

                        • EasyGoing1
                          Shock Therapist
                          • Sep 2016
                          • 977
                          • USA

                          #13
                          Re: Building a solid state relay module

                          Originally posted by budm
                          You need SSR DC output (I.E. MOSFET) if you want PWM output.
                          A potentially interesting find ... if I use an analog pin as the PWM source to the LED, and then open the relay, but immediately after opening the relay, I tur that pin off then back on ... it still remains powered (it keeps the triac latched) so I started playing with delay times between turning that pin to 0 and then back on and discovered that if I delay by as much as 12 microseconds ... it stays latched... but at 13 microseconds, it trips the triac and breaks the circuit ... so at least we know it takes somewhere between 12 and 13 microseconds to break the triac connection.
                          sigpic

                          Comment

                          • EasyGoing1
                            Shock Therapist
                            • Sep 2016
                            • 977
                            • USA

                            #14
                            Re: Building a solid state relay module

                            Originally posted by budm
                            You need SSR DC output (I.E. MOSFET) if you want PWM output.
                            What do you mean SSR DC output? you talking something like using a 555 with a MOSFET to generate the pulse?
                            sigpic

                            Comment

                            • budm
                              Badcaps Legend
                              • Feb 2010
                              • 40746
                              • USA

                              #15
                              Re: Building a solid state relay module

                              They make SSR with MOSFET on the output side.
                              I.E. http://www.ssousa.com/MOSFET-Output-SSR
                              Also Look at CRYDOM again, see what DC output is.
                              Last edited by budm; 09-17-2018, 02:14 PM.
                              Never stop learning
                              Basic LCD TV and Monitor troubleshooting guides.
                              http://www.badcaps.net/forum/showthr...956#post305956

                              Voltage Regulator (LDO) testing:
                              http://www.badcaps.net/forum/showthr...999#post300999

                              Inverter testing using old CFL:
                              http://www.badcaps.net/forum/showthr...er+testing+cfl

                              Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                              http://s807.photobucket.com/user/budm/library/

                              TV Factory reset codes listing:
                              http://www.badcaps.net/forum/showthread.php?t=24809

                              Comment

                              • EasyGoing1
                                Shock Therapist
                                • Sep 2016
                                • 977
                                • USA

                                #16
                                Re: Building a solid state relay module

                                Originally posted by budm
                                They make SSR with MOSFET on the output side.
                                I.E. http://www.ssousa.com/MOSFET-Output-SSR
                                Look at CRYDOM again, see what DC output is.
                                I see what you're saying ... I was just going to google to see if they made DC load capable SSRs
                                sigpic

                                Comment

                                • budm
                                  Badcaps Legend
                                  • Feb 2010
                                  • 40746
                                  • USA

                                  #17
                                  Re: Building a solid state relay module

                                  It is right there in the link, it can handle AC and DC, or DC only.
                                  Last edited by budm; 09-17-2018, 02:18 PM.
                                  Never stop learning
                                  Basic LCD TV and Monitor troubleshooting guides.
                                  http://www.badcaps.net/forum/showthr...956#post305956

                                  Voltage Regulator (LDO) testing:
                                  http://www.badcaps.net/forum/showthr...999#post300999

                                  Inverter testing using old CFL:
                                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                                  http://s807.photobucket.com/user/budm/library/

                                  TV Factory reset codes listing:
                                  http://www.badcaps.net/forum/showthread.php?t=24809

                                  Comment

                                  • Curious.George
                                    Badcaps Legend
                                    • Nov 2011
                                    • 2305
                                    • Unknown

                                    #18
                                    Re: Building a solid state relay module

                                    Originally posted by EasyGoing1
                                    I see what you're saying ... I was just going to google to see if they made DC load capable SSRs
                                    Depending on circuit topology. you can fashion an AC/DC SSR out of a bridge and a "switch". The bridge ensures the switch always sees the same polarity signals across it. But, this increases the drop across the SSR.

                                    Comment

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