20Amp H-Bridge driving with AVR

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?

Reply to
<Huaci>
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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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Paul E. Bennett ....................
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Reply to
Paul E. Bennett

Get thee over to

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There's a whole bunch of articles in the forums and academy section well worth (free) registration

Good luck

Tom

Reply to
surftom

Check out

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Reply to
dmm

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:

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Regards, Andras Tantos

Reply to
Andras Tantos

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