+ Post New Thread
Results 1 to 3 of 3
  1. #1
    Member level 3
    Points: 1,396, Level: 8

    Join Date
    Nov 2012
    Posts
    65
    Helped
    0 / 0
    Points
    1,396
    Level
    8

    Surge lighting protection for 24V circuit

    I having a circuit is equip with isolate dc dc 24v to 5v to power my embedded circuit. The distance from power supply to my circuit is 50m (out door). What kind of device i should choose for protection: mov, tvs, efuse, gas tube..

    •   AltAdvertisment

        
       

  2. #2
    Super Moderator
    Points: 247,256, Level: 100
    Awards:
    1st Helpful Member

    Join Date
    Jan 2008
    Location
    Bochum, Germany
    Posts
    42,987
    Helped
    13082 / 13082
    Points
    247,256
    Level
    100

    Re: Surge lighting protection for 24V circuit

    Multiple parallel TVS would be my first choice. Sufficient DCDC isolation voltage for common mode surge can be an issue, PCB spark gaps may be helpful.



    •   AltAdvertisment

        
       

  3. #3
    Super Moderator
    Points: 64,830, Level: 62
    Achievements:
    7 years registered
    Awards:
    Most Frequent Poster 3rd Helpful Member

    Join Date
    Apr 2014
    Posts
    13,161
    Helped
    3040 / 3040
    Points
    64,830
    Level
    62

    Re: Surge lighting protection for 24V circuit

    Hi,

    It surely depends on the situation.
    * If the wiring is overhead
    * In the mountains (rocky)
    * and it ends on a high metal pole
    You need a higher protection class, than with
    * underground wiring
    * plain, wet, ground

    For good protection you need a multistage system. With series isolation or current limiting, and parallel earthing.
    Gas discharge, isolation or other series impedance, TVS at least
    ***

    I'd feed the 24V over the long distance. It doesn't need that high protection level and it may have higher series impedance with less power loss.

    Klaus
    Please don´t contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



--[[ ]]--