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Protection for Elelctronic equipment in cars.

Discussion in 'Electronic Design' started by Joe.G, Mar 22, 2005.

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  1. Joe.G

    Joe.G Guest

    Hi All,

    To run micro's and other electronic equipment in cars -
    What protection would you suggest.

    Where can I find information on how to protect sensitive
    electronic equipment from surges and spikes etc.

    Eg Transient Voltage surpressors etc

    Thanks in advance.

  2. John - KD5YI

    John - KD5YI Guest

    Here is a start:

  3. Take this link to my articles "Reading the World" and "Writing the World".


    Not automotive specifically but definitely harsh environments. Once you
    have read those articles, which give a brief overview, then you should have
    an idea what else you need to do.

    Paul E. Bennett ....................<email://>
    Forth based HIDECS Consultancy .....<>
    Mob: +44 (0)7811-639972
    Tel: +44 (0)1235-811095
    Going Forth Safely ....EBA.
  4. Ken Smith

    Ken Smith Guest

    Teccor has a few app-notes on the subject of protection. I like the
    Sidactor devices they make as a way to clamp spikes. Just remember that
    in a car, you have a car battery that can give you nearly infinite current
    so you must always make the protection limit the current.

    In general PTC overcurrent devices such as Bourns and Tyco/Raychem sell,
    work well to protect things like motors against long term overloads. They
    open the circuit long after any semiconductors they may be protecting are
    smoked. They are none the less useful when combined with a clamping and
    other current limiting method. They can prevent the protection circuit
    from overheating.

    Another method is to design your circuit using truely huge semiconductors
    so that it will happily continue working with 60V applied. Reverse
    protection diodes on the power connections are needed too.

    Murata has some devices called "posistors". They are much too whimpy to
    protect your power connections but could be useful as part of an I/O line
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