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does anyone have a shutdown controller design they can share?

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  • does anyone have a shutdown controller design they can share?

    I want to build my own shutdown controller, does anyone have any schematics for one?
    Pontiac Grand Am
    building CarPC useing BookPC and Lilliput 7 inch TS.

  • #2
    Check out page 14 of this
    MikeH

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    • #3
      Thank you very much for your link,it is a MUST read for all with Epia Mini-Itw motherboards
      Originally posted by MikeH
      Check out page 14 of this

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      • #4
        is that just a shutdown controller? or also a tank circuit?
        Pontiac Grand Am
        building CarPC useing BookPC and Lilliput 7 inch TS.

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        • #5
          DJ
          is that just a shutdown controller? or also a tank circuit?
          Are you referring to the ITPS? It is a turn-on/shoutdown controller plus a (somewhat unusable) 12V regulator. As I understand, a "tank circuit" usually consists of a diode feeding a large capacitor, which attempts to hold enough charge to continue feeding 12v to you carpc during engine cranking. The ITPS DOES NOT do this. However, they have recommended the following as a way to help overcome the crank issue. This approach should work much better than a capacitor:
          Attached Files
          MikeH

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          • #6
            MikeH,

            Some has already tried this solution, and surprised the ITPS barely work. This is due to the fact that the ITPS already need 13.3V atleast to output a regulated 12V, loosing another 0.6V throught the diode make the matter worst.


            The battery symbol is drawn funny

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            • #7
              i just want a design simmilar to jeffs...
              Pontiac Grand Am
              building CarPC useing BookPC and Lilliput 7 inch TS.

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              • #8
                Ricky
                Some has already tried this solution, and surprised the ITPS barely work. This is due to the fact that the ITPS already need 13.3V atleast to output a regulated 12V, loosing another 0.6V throught the diode make the matter worst
                Agreed, but I have bypassed the onboard 12v regulator. I'm using the laptop (Radio Shack) regulator before going into the ITPS. Therefore, there should only be a .1v drop across the switching FET on the ITPS. If my backup battery is fully charged, I should be able to get 11.3v+ or so (marginal, but should keep the mobo from rebooting) at the output of the ITPS during cranking. Obviously, I haven't tried it yet, so I'll let you know how it works when I do.
                The battery symbol is drawn funny
                Yeah, looks funny to me too. It should have more cells...looks like an asymmetrical capacitor.
                MikeH

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                • #9
                  all i wanna do is build a fairly simple shutdown controller.
                  Pontiac Grand Am
                  building CarPC useing BookPC and Lilliput 7 inch TS.

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                  • #10
                    Check out my "old" mp3car project page. In the hardware section you should see Jeff's shutdown controller (original) which I built a first working prototype of and its schematic.

                    http://home.comcast.net/~danielsoh/shutdown.htm
                    04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

                    Fast car, fast PC. ;)

                    http://www.arcdesigns.net/carpc/

                    My TL CarPC ver2

                    FSR Flash Skin w/ moving weather maps

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                    • #11
                      thanks alot, exactly what i was looking for. I got one question, i tried to add the "2N3904-ND NPN SML SIG G.P. AMP&SWITCH TO92" to my shopping cart on digikey and they dont have that exact product. Which one of these would be the best substiute? http://www.digikey.com/scripts/DkSea...S&Cat=30999646
                      Pontiac Grand Am
                      building CarPC useing BookPC and Lilliput 7 inch TS.

                      Comment


                      • #12
                        This one should do.

                        http://www.digikey.com/scripts/DkSea...=65442&Site=US
                        04 Acura TL w/ core2duo 2ghz laptop w/ 1gb RAM on a docking station.

                        Fast car, fast PC. ;)

                        http://www.arcdesigns.net/carpc/

                        My TL CarPC ver2

                        FSR Flash Skin w/ moving weather maps

                        Comment


                        • #13
                          MikeH,

                          No I meant it was drawn upside down

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                          • #14
                            got recommendation for a good bread board for it?
                            Pontiac Grand Am
                            building CarPC useing BookPC and Lilliput 7 inch TS.

                            Comment


                            • #15
                              Originally posted by Ricky327
                              MikeH,

                              No I meant it was drawn upside down
                              Exactly, this way of connecting stuff might give the carpc a typical R2D2 response. Whhheeeeee... and emit some smoke

                              white bream
                              working on a trilogy: CARGO - UNIGO - MERGO
                              CARGO = the Car Computer
                              Intel Celeron M, [P]SDC, uBlox GPS, GPRS, WLAN, Silabs FM, RDS, TMC,
                              Dual-audio, Onecable TFT, Microsize: 45 x 108 x 168mm (1.8 x 4.3 x 6.6")

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