General Protection circuits

Discussion in 'General Electronics Chat' started by phuzionz, Dec 5, 2008.

  1. phuzionz

    Thread Starter Active Member

    Dec 5, 2008
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    Dear Forummembers,

    I discover this board and was wondered about the technical knowledge included in all the threads. Therefore i plan to write my question here.

    I have a few questions where i want some feedback on, to push me in the right direction to find a good solution.

    We have a battery supply that supplies every piece in our box. This box have inputs and outputs. The inputswill used for read a sensor and the outputs to drive a motor. This is in short description.

    Now my question is, what for diagnostics and protection circuits i have to forseen to work very save in my battery supply part. I give an example:
    • Overcurrent protection
    • Overvoltage protection
    • Undervoltage diagnostics
    • Over temperature diagnostics
    • Reverse polarity protection
    If you know other protection or diagnostics issue, please write it down.

    I'am also looking for relevant protection and diagnostics issue for following cases:

    Analog input, to read a PTC
    Digital input, to read speed sensor
    Digital output, to drive motor with PWM

    If someone know what i reallly have to forseen on these in-and outputs, please let me know.
    It would be also very helpfull to give me some technical solutions to solve the reqiurements. I know this is general question, but i don't exêct to give me a detailed solution, onlu to put me in the right direction.

    Thank you,
    Jef
     
    Last edited: Dec 5, 2008
  2. bertus

    Administrator

    Apr 5, 2008
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  3. phuzionz

    Thread Starter Active Member

    Dec 5, 2008
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    Thank you for the information, the two articels were very helpfull.

    Now i'am also looking for possible protection and diagnostics for a digital input and anlog input, analog output and digital output.
    Any information is welcome.

    Greetings,
    Jef
     
  4. bertus

    Administrator

    Apr 5, 2008
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  5. phuzionz

    Thread Starter Active Member

    Dec 5, 2008
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    No not really. So when you have lot of inputs and outputs you have to think about a few things. One thing is that it is working in a save way.

    For example: When i have a digital input on my µC.
    I have to consider that a few problems arise, spikes on the input (integrate filter), short to ground (protection circuit) etc.....

    Now i want to have a summary what can happen if you have an analog in-and output, digital in-and output.
    What for actions do i have to take to minimize the problems.

    Greetings,
    Jef
     
  6. phuzionz

    Thread Starter Active Member

    Dec 5, 2008
    47
    0
    Is there nobody with an idea on that issue.

    It is difficult to find that on the internet because it's a very general question.

    For the digital input i also add a noise filter. all other ideas are very welcome.

    Thank you,
    Jef
     
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