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Author Topic: [REQ] PIC based H-Bridge driver for Bipolar stepper  (Read 17988 times)
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leaveme
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« Reply #25 on: November 10, 2010, 04:53:36 04:53 »

Guy's, thanks for your valuable feedback.
Please give me some time to draw the schematic so that my idea will explain you better.
Just one problem I'm having is, I can't find L6506 in Proteus library. I have to now manually draw it... Huh
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leaveme
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« Reply #26 on: November 10, 2010, 12:13:59 12:13 »

Finally, I have drawn the schematic. Though more adaption will be required. Some of the components I couldn't find in Proteus and they have been drawn manually (i.e. L6506, IR2104 etc..

It is actually MOSFET based high current Bipolar driver and will be open source (if I really able to finish it).

Pal's pls do some criticise and raise your helping hands to finish un-done area.

Thanx.
« Last Edit: November 10, 2010, 12:22:22 12:22 by leaveme » Logged
Ichan
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« Reply #27 on: November 10, 2010, 03:11:17 15:11 »

You didn't read your homework  Wink

You still do not understand the principle of microstepping, current modulation is an integral part of stepping sequences.

-ichan
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leaveme
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« Reply #28 on: November 10, 2010, 03:55:56 15:55 »

You didn't read your homework  Wink

You still do not understand the principle of microstepping, current modulation is an integral part of stepping sequences.

-ichan
Thank you ichan. :-)
Please check @ page 14 for L6506_Application_Notes.pdf and page 10 for AN1495_Stepper_driver.pdf (mostly fast decay mode).
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TomJackson69
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« Reply #29 on: November 10, 2010, 04:38:42 16:38 »

You should spend a lot of time to research and read about microstepping. It is a lot complex than what you think. If you choose to drive the driver with ONE/ZERO logic pattern than you need a very long time to experiment. You can look at the wave form of the working unit and come up with ONE/ZERO logic pattern close to a real microstep that use sine/cosine calculation (sine/cosine look-up table for faster).

I think the easy way is to use some device that have build-in microstep, such as A3955 and A3977. The A3955 needs logic pattern to control current of each winding for microstep (you still need to write program to control it. The A3977 is much easier than the A3955. It can drive 2.5A and build-in microstep. You can control the microstep with M1 and M2. About 8 years ago Allego give out sample like crazy, but I don’t know that they will give out sample now.

Anyways, do more reading to understand the real mechanic of microstep.

Drawing the component in Proteus does not help for simulation because that device will not work, unless you know how to create the MODEL for it.

Regards,

Tom
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Ichan
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« Reply #30 on: November 13, 2010, 09:26:57 21:26 »

Based on what have been talked in this thread then I'd suggest you as the first step to try this arrangement (on real not on proteus):

PICstep uC - R2R DAC - L6506 - L6203

After that you can try to write your on code, and then try different hardware configuration.

-ichan
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