+ Post New Thread
Results 1 to 5 of 5
  1. #1
    Full Member level 2
    Points: 916, Level: 6
    M.Rehan's Avatar
    Join Date
    Feb 2016
    Posts
    129
    Helped
    33 / 33
    Points
    916
    Level
    6

    Circuit diagram to detect short circuit and over current

    Any circuits to detect Short circuit and over current using PIC microcontroller (18F).

    i.e
    output of circuit changes from low to high OR high to low when short circuit happens or over current flows.

    •   AltAdvertisement

        
       

  2. #2
    Super Moderator
    Points: 77,731, Level: 67
    Achievements:
    7 years registered
    Awards:
    Most Frequent Poster 3rd Helpful Member

    Join Date
    Apr 2014
    Posts
    15,759
    Helped
    3590 / 3590
    Points
    77,731
    Level
    67

    Re: Circuit diagram to detect short circuit and over current

    Hi,

    AC, DC, isolated or not?

    It sounds easy, but there are a lot of details to be discussed.
    How fast?
    Latching or not?

    Tell us more.

    Klaus


    1 members found this post helpful.

    •   AltAdvertisement

        
       

  3. #3
    Full Member level 2
    Points: 916, Level: 6
    M.Rehan's Avatar
    Join Date
    Feb 2016
    Posts
    129
    Helped
    33 / 33
    Points
    916
    Level
    6

    Re: Circuit diagram to detect short circuit and over current

    Click image for larger version. 

Name:	sine_power_002 - mosbank-page-001.jpg 
Views:	16 
Size:	609.1 KB 
ID:	126724Click image for larger version. 

Name:	1.PNG 
Views:	16 
Size:	28.7 KB 
ID:	126725

    Isolation is required.

    Circuit like attached but it does not have isolation and also not very reliable.



    •   AltAdvertisement

        
       

  4. #4
    Super Moderator
    Points: 77,731, Level: 67
    Achievements:
    7 years registered
    Awards:
    Most Frequent Poster 3rd Helpful Member

    Join Date
    Apr 2014
    Posts
    15,759
    Helped
    3590 / 3590
    Points
    77,731
    Level
    67

    Re: Circuit diagram to detect short circuit and over current

    Hi,

    A current transformer for isolation. Rectifier, filter, comparator.

    Klaus


    1 members found this post helpful.

  5. #5
    Advanced Member level 5
    Points: 32,926, Level: 44
    Achievements:
    7 years registered

    Join Date
    Sep 2008
    Location
    cambridge
    Posts
    6,853
    Helped
    496 / 496
    Points
    32,926
    Level
    44

    Re: Circuit diagram to detect short circuit and over current

    you could just use a hall sensor and read its output into a comparator to see if there is overcurrent. (ensure hall sensor bandwidth is fast enough for your purpose)
    Short circuit has happened when output volts has gone to zero, so just detect the zero volts and that is it.


    1 members found this post helpful.

--[[ ]]--