New board help requested

[BCwanderer]

Look at the IR2010 H bridge drivers.
They can drive most FETs
Voltages to 200 volts
Directly interface to microcomputers
Can be bootstrapped so no high voltage supply source is needed.

http://pdf.alldatasheet.co.kr/datash...RF/IR2010.html

There are a number of other H bridge drivers with similar performance

Add current chopping and you have a high current - high voltage bi-polar driver.

[pminmo]

Hi guys,
Teckno,
Actually I'm in work on a expanded version of the AVR board on the first post. 100V, unipolar, heavy current (can't say yet, the FETS are more capable than the board will be) microstepping. The unipolar will come first as the hardware is almost ready to order protoboards on. Microstepping has been the hurdle to implement in a low cost, KISS design, but that too I believe is not an issue, at least to 1/8th step.
Also in parallel is a bipolar design.

BCwandererer, I'm familiar with the 2010, 2104, etc. Right now I'm playing with P channels on the top side though. Their simpler, their cost too implement is less, 120V 14A Pchannels don't cost much these days and their pretty robust.

Both designs are limited to 100V.

[BCwanderer]

I would like to contribute some ideas for a unipolar, pic18252 based design.
I have been working on the board design.
I have not started coding as I have been working on the layout.
The microproccesser is a pic18252 because I have some on hand.
Resonator is 20 mhz
I am driving the FETs with a high current driver chip.
Microstepping will be by using a resistor ladder with 4 micro outputs to input into the comparator that controls the current in each leg.

The board layout is still under review as there may be some bypass caps to add. Values of resistors on the layout are not right. They will be fine tuned when calulated.

When the unipolar unit is working, a bipolar unit will use similar coding.

I am throwing it out for ideas.
Maybe someone has done this before and has ideas that will shorten the learning curve.

Layout and schematic attached (forgive the non-technical layouts - I am still new at this)

Schematic reloaded in larger size

[pminmo]

BCwanderer,
I can't read your schematic can you enlarge it?

[tekno]

Sweet. are you planiing on a chopper board or resisters? and or are you going to expand this to Bipolar.

Sorry I havent replyed just been a lerker of late.

Tek

Originally Posted by pminmo Hi guys, Teckno, Actually I'm in work on a expanded version of the AVR board on the first post. 100V, unipolar, heavy current (can't say yet, the FETS are more capable than the board will be) microstepping. The unipolar will come first as the hardware is almost ready to order protoboards on. Microstepping has been the hurdle to implement in a low cost, KISS design, but that too I believe is not an issue, at least to 1/8th step. Also in parallel is a bipolar design. BCwandererer, I'm familiar with the 2010, 2104, etc. Right now I'm playing with P channels on the top side though. Their simpler, their cost too implement is less, 120V 14A Pchannels don't cost much these days and their pretty robust. Both designs are limited to 100V.

[pminmo]

tekno,
if the question is to me, they are chopped.

[tekno]

THanks Phil it was to you.. sounds like a sweet idea. I have been thinking of how to make a Power Supply since I read this.

Originally Posted by pminmo tekno, if the question is to me, they are chopped.

[Philbee]

HI, very new to this cnc idea but would like to know if anyone has built a controler ussing the Alegro a3983 driver chip, if so do you have a circuit diagram and board layout and how did you cope with the heat disipation. I was thinking of mounting it upside down and gluing or soldering a heat sink to it.

[coder4life]

I just bought the Butterfly proto board about a month ago with the c programming manual kit. Thought about doing a cnc system with it . I joined the forum and being a linux user went right to the open source after introducing myself... Was wondering where this section of the forum was heading and if AVR Butterfly could be of help... They are cheap and I am thinking about buying em for christmas gifts.