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Question about getting more current from the Pololu Motor Controller — Parallax Forums

Question about getting more current from the Pololu Motor Controller

Russ FergusonRuss Ferguson Posts: 206
edited 2005-09-26 14:04 in Robotics
It appears to me that the output of a motor controller with a low current H-bridge such as the Pololu Micro Dual Serial Motor Controller· Stock#:·30052···
could be connected directly to the input of a higher current H-Bridge.

Is there something that I am overlooking?

For·example,·one of the Pololu motor outputs could be·connected to the input of the bridge described on·the Bob Blick site. The Bob Blick site has a page describing a "100 watt or 5 amp or 40 volt H-Bridge".
http://www.bobblick.com/techref/projects/hbridge/hb01sch.pdf
http://www.bobblick.com/techref/projects/hbridge/hbridge.html

The blue and green lines·between the circuits are·the connections I am proposing.
attachment.php?attachmentid=38939attachment.php?attachmentid=38939

Post Edited (Russ) : 9/26/2005 4:11:33 AM GMT

Comments

  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2005-09-26 04:35
    Russ,

    What you are describing is essentially what I have done with a "servo" modification on this link...

    http://forums.parallax.com/showthread.php?p=525862

    ...I would consider the Opto-isolator method simply because it automatically takes care of potential problems
    such as ground loops, and a h-bridge melt down condition. ( i.e. both input pins to the H-bridge high )

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Beau Schwabe

    IC Layout Engineer
    Parallax, Inc.
  • Russ FergusonRuss Ferguson Posts: 206
    edited 2005-09-26 14:04
    Beau:

    Thank you for pointing out the other thread. This is exactly what I was hoping to do (with the Pololu).
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