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Solid state solution advice

Discussion in 'General Electronics Discussion' started by Capofarukgb, Mar 7, 2017.

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  1. Capofarukgb

    Capofarukgb

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    Mar 7, 2017
    So good evening everyone, I have this project I'm pondering with it consists of three elec/mech relays and some diods all 12v dc for automotive application
    I wish to adopt it to a solid state solution, I'm out of touch a little done electronics at uni but that was many years ago lol
    Was thinking something like using jk flip flop or may even consider advance chips depending on price ofcourse
    Any decent advice would be a great help
    Here is the project



    Auto folding mirror for discovery 2 with lock unlock remot button
    Diagram attached as image
    Relays from left to right:

    1) Blocks the modification from working when the ignition is on, this prevents the mirrors folding if you lock the doors while in motion or if the auto lock (above 5mph) is turned on.

    2) Provides a live feed to the ignition pin on the mirror ECU to "wake it up".

    3) Mimics the action of the dashboard button to fold/unfold the mirrors.

    The two diodes at the top are to prevent a short between the two central locking wires (one is unlock, other is lock)

    The diode at the bottom is to block the feed from relay (2) so that the rest of the ignition circuit is not switched on for the duration of the central locking pulse.
    I
     

    Attached Files:

  2. Bluejets

    Bluejets

    4,150
    879
    Oct 5, 2014
    So use solid state relays.
     
  3. Kiwi

    Kiwi

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    Jan 28, 2013
    I have been thinking about doing this to the wife's new Toyota.

    Do you have a single normally open momentary fold switch that does both fold and unfold?

    Have you checked that the door lock outputs are positive for both lock and unlock?

    How long do the door locks keep this output live?

    Relay 2 will only keep ignition on the ECU whilst the door lock output is active.

    Will the ECU still operate if it loses ignition feed while the mirrors are folding?
     
  4. Capofarukgb

    Capofarukgb

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    Mar 7, 2017
    Thanks but I find solid state pretty expensive in the UK and also bulky where a chip would be much smaller
     
  5. Capofarukgb

    Capofarukgb

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    Mar 7, 2017
    AS ABOVE
    Hi kiwi I think most of your questions are already answered in my original post
    See above
    Please note this is working tried and tested module but it's bulky and obviously noisy due to relays I prefer a solid state also to satisfy a piece of mind
    It's been puzzling me in how to do it in solid state using mc
    Please let me know if I have missed anything thanks
     
    Last edited: Mar 8, 2017
  6. AnalogKid

    AnalogKid

    2,375
    661
    Jun 10, 2015
    Not counting the coil current of another relay, are any of the relays controlling significant power, such as more than 1 A?
    What does N/S/F stand for?

    ak
     
  7. Capofarukgb

    Capofarukgb

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    Mar 7, 2017
    No not that much at all and NSF is a driving term here in the UK relates to near side front of a car or the kerb side or passenger side bearing in mind we drive on left so it's left hand side of the vehicle
     
  8. AnalogKid

    AnalogKid

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    661
    Jun 10, 2015
    Would 1 A transistors, such as a TIP29/30 be safely overrated for this application?

    ak
     
  9. Capofarukgb

    Capofarukgb

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    Mar 7, 2017
    I guess it would be fine to use it since it's only a momentary live circuit and otherwise asleep, what do you have in mind ?
     
  10. Bluejets

    Bluejets

    4,150
    879
    Oct 5, 2014
    A transistor used as a switch = solid state relay.
     
  11. Capofarukgb

    Capofarukgb

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    Mar 7, 2017
    Bril would you help me with a wiring diagram for tp 29/30 ?
     
  12. AnalogKid

    AnalogKid

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    661
    Jun 10, 2015
    Long-term, I've found that bipolar power transistors are more reliable then power MOSFETs in 1-off automotive projects. The TIP29 and TIP30 are complimentary bipolar power transistors rated for 1 A collector current, and make excellent low-current power switches. If the peak current being handled is over 0.5 A, move up to the TIP31/32.

    ak
     
  13. Capofarukgb

    Capofarukgb

    8
    0
    Mar 7, 2017
    Sweet, it's perfect but any chance helping me with convertingthe wiring diagram to using transistors instead ?
     
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