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Troubles with H-bridge — Parallax Forums

Troubles with H-bridge

ArchiverArchiver Posts: 46,084
edited 2002-04-12 19:46 in General Discussion
Hello Stampers.


I know, my problem isn't really stamp related but because I use a stamp in
the project, and because there are very smart guys here....;-))

I use a stamp to control a self designed H-Bridge and it won't work, the
hole story is to long for this forum so I putted everything on

http://users.pandora.be/jff/tankmotorsturing/tankmotorsturing.html

Maybe somebody knows the cause of my problem?


Greetz from Belgium

Michel De Meester



Met vriendelijke groetjes,

> ************************************************
> Michel De Meester
> Biotechnisch Onderhoud
> Universitair Ziekenhuis Antwerpen
> Wilrijkstraat 10
> 2650 Edegem - B
> tel: ++32 (0)3 821 36 47
> e-mail: michel.de.meester@u...
>
> *************************************************
>
>

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-04-12 17:01
    Try removing The rectifiers and see if that has any effect on the motor
    voltage? Skip
    Original Message
    From: De Meester, Michel [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=hZ7v2ATQsJo3dlyuFOLocrWVER8CbP_1Q_HMxjcME4o1b-OVLB21NL7H2r9NER_3jJ-OYtbNADJPB_qOYVQLxDSRFpWaO5Q4Dg]Michel.De.Meester@u...[/url
    Sent: Friday, April 12, 2002 10:21 AM
    To: 'basicstamps@yahoogroups.com'
    Subject: [noparse][[/noparse]basicstamps] Troubles with H-bridge
    Importance: High
    Sensitivity: Private


    Hello Stampers.


    I know, my problem isn't really stamp related but because I use a stamp in
    the project, and because there are very smart guys here....;-))

    I use a stamp to control a self designed H-Bridge and it won't work, the
    hole story is to long for this forum so I putted everything on

    http://users.pandora.be/jff/tankmototuring/tankmotorsturing.html

    Maybe somebody knows the cause of my problem?


    Greetz from Belgium

    Michel De Meester



    Met vriendelijke groetjes,

    > ************************************************
    > Michel De Meester
    > Biotechnisch Onderhoud
    > Universitair Ziekenhuis Antwerpen
    > Wilrijkstraat 10
    > 2650 Edegem - B
    > tel: ++32 (0)3 821 36 47
    > e-mail: michel.de.meester@u...
    >
    > *************************************************
    >
    >

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  • ArchiverArchiver Posts: 46,084
    edited 2002-04-12 18:10
    At 04:21 PM 4/12/02 +0200, De Meester, Michel wrote:
    >Hello Stampers.
    >
    >I use a stamp to control a self designed H-Bridge and it won't work, the
    >hole story is to long for this forum so I putted everything on
    >
    >http://users.pandora.be/jff/tankmotorsturing/tankmotorsturing.html

    You need a proper FET driver circuit for the high side FETs. The Stamp
    puts out 5V. A standard N-channel mosfet requires a gate voltage at least
    10V higher than the source - 12V is better. You want the FET to fully
    turned on - that means the source voltage will be the same as the drain
    voltage which is 12V. The gate needs to be at least 10V higher than that: 22V.

    A simple but effective H-bridge driver circuit can be found at Bob Blick's
    site: <www.bobblick.com> . Give it a try.

    dwayne


    Dwayne Reid <dwayner@p...>
    Trinity Electronics Systems Ltd Edmonton, AB, CANADA
    (780) 489-3199 voice (780) 487-6397 fax

    Celebrating 18 years of Engineering Innovation (1984 - 2002)
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  • ArchiverArchiver Posts: 46,084
    edited 2002-04-12 19:46
    At 10:21 04/12/02, De Meester, Michel wrote:
    >Hello Stampers.
    >
    >
    >I know, my problem isn't really stamp related but because I use a stamp in
    >the project, and because there are very smart guys here....;-))
    >
    >I use a stamp to control a self designed H-Bridge and it won't work, the
    >hole story is to long for this forum so I putted everything on
    >
    >http://users.pandora.be/jff/tankmotorsturing/tankmotorsturing.html
    >
    >Maybe somebody knows the cause of my problem?
    >
    >
    >Greetz from Belgium
    >
    >Michel De Meester

    The Stamp isn't capable of driving the FETs hard enough. You need a
    driving source capable of 10 - 15 volts - note that 15 volts is the data
    sheet maximum. It also looks like you're using the same drive current from
    the Stamp pins to light the LEDs. Remove the LEDs and see if that helps,
    but I still think you'll need a higher voltage driver than the 5 volts the
    Stamp provides.


    Jim H
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