20Amp H-Bridge driving with AVR

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<Huaci> Contact options for registered users 's Avatar (by Gravatar) posted on
March 13, 2005, 12:48 pm
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I'm an electonic amateur enthusiast and  I want to drive 20Amp 12-24v DC
motors with a H-bridge controlled with an AVR.

Basicly AVR will receive speed commands from RS232, and it will count
quadrature encoder signals (I do not now how to do it fast yet) from an
encoder attacehed to the motor shaft and it will  generate ON-OFF signals
for the H-bridge.

Do you know any open source, open schematics project with the above
functionality?



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Paul E. Bennett Contact options for registered users 's Avatar (by Gravatar) posted on
March 13, 2005, 2:25 pm
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Re: 20Amp H-Bridge driving with AVR
<Huaci> wrote:

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This sort of thing I have done many times over for different projects
(AC/DC/Stepper). You know the form of the output and you should know the
form of the quadrature encoder input. Don't shy away from using hardware
portions to the solution as this can often be less expensive and easier to
accomplish than trying to do it all in software.

I would advise you to really read the specs of the IGBT's or PowerFETs you
use and ensure that you drive them properly (quite simple when you set up
the right drive voltages). Look at isolation issues within the bridge.

I won't post my schematics here as I earn my keep by knowing this stuff
very thoroughly. But the above should be enough of a clue.

I will, however, reference a good book on the topic:-

  "Electric Drives and Their Controls" by Richard M. Crowder; OUP
  ISBN 0-19-856565-8

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surftom Contact options for registered users 's Avatar (by Gravatar) posted on
March 13, 2005, 2:25 pm
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Re: 20Amp H-Bridge driving with AVR
Get thee over to
www.avrfreaks.net
There's a whole bunch of articles in the forums and academy section
well worth (free) registration

Good luck

Tom


dmm Contact options for registered users 's Avatar (by Gravatar) posted on
March 13, 2005, 9:25 pm
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Re: 20Amp H-Bridge driving with AVR

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Check out
http://www.4qd.co.uk


Andras Tantos Contact options for registered users 's Avatar (by Gravatar) posted on
March 14, 2005, 10:32 pm
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Re: 20Amp H-Bridge driving with AVR
<Huaci> wrote in message
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Hi!

I'm about to finish a project with almost the same specification (I spec'ed
it for 6..18V DC). SCH and PCB is available, but they contain some bugs I've
found after publishing it. Firmware with I2C and RS232 support and a
corrected SCH/PCB will soon follow. Note, that though the HW has support for
quadrature encoders, I'm using back-EMF at the moment to measure the speed:
easier and precise enough for my needs. Anyway, take a look:

http://h-storm.tantos.homedns.org/h-bridge.htm

Regards,
Andras Tantos



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