Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control - Page 40 - Fuel Economy, Hypermiling, EcoModding News and Forum

jimprince · 09-26-2010, 01:00 AM

The power supply that runs the processor and the 6 gate drivers

MPaulHolmes · 09-26-2010, 01:04 AM

Oh ya! That makes more sense. I don't have anything for that right now. The voltage needs to be somewhere between 12v and 18v. And the current draw is around 600-700mA or so total. Just one channel.

Alternatively, you can use the 12v car battery, but I'm not sure how good that option is.

jimprince · 09-26-2010, 02:35 AM

What is the input voltage (the battery pack voltage)? I can also provide the 6 10-12V supplies for the IGBT drivers and -12V if needed. Other posts discussed the need and you can get rid of the power modules.

MPaulHolmes · 09-26-2010, 03:17 AM

I barely made it! 11:15pm! First test of the AC controller a success! Oh heck ya. Just with the weenie 1/3HP motor though.

http://www.youtube.com/watch?v=Yu6uwl6N9aE

MPaulHolmes · 09-26-2010, 03:31 AM

Hello! Input voltage is I have no idea. If IGBTs are being used, then maybe 300v DC bus? If it's the mosfet based controller, then less than about 144v I think.

You can get rid of the VLA106-15151's??? Those are the most expensive part. I would love to find a good alternative to them. They are rated for 2500V rms isolation for 1 minute.

jimprince · 09-26-2010, 03:59 AM

Isolation is not an issue. I will do two designs for 100V - 200V and 200V-400V Please list the output voltages and currents.

MPaulHolmes · 09-26-2010, 11:51 AM

Well, for the IGBT version, output voltage of 24v would be good, 100mA-200mA. And 15v output, 100mA to 200mA for a mosfet based one.

roguethunder · 09-26-2010, 05:58 PM

Quote:

Originally Posted by MPaulHolmes

I barely made it! 11:15pm! First test of the AC controller a success! Oh heck ya. Just with the weenie 1/3HP motor though.

http://www.youtube.com/watch?v=Yu6uwl6N9aE

Yeha! *toasts to the controller* It lives! :P

Interesting, toying with 2 designs eh? Will be interesting to see the differences in cost/performance.

MPaulHolmes · 09-26-2010, 06:14 PM

I'm very interested to see the difference in price. Cheap IGBTs can be found mostly on Ebay, but not a certain steady supply of new parts. And they are the clear winner at higher voltages, but there aren't a lot of people out there that seem to want to put 300v worth of batteries in their car. Or maybe that's just me. haha. If you can have all the advantages of AC, like regen, and a motor that runs a million miles with no brush changes, and the advantages of DC like lower voltage components, which are sometimes cheaper, and not dying instantly if you touch the batteries. We'll see though. I think the mosfet based one can be done for a few hundred dollars, but would be limited to like 144v or maybe even less if you do much regen.

The igbt one seemed to have an "all new parts" cost of around $2500 if that one open source AC controller price can't be improved upon much.

TheSGC · 09-26-2010, 06:36 PM

I have done basically zero work on my controller, so it's good to see some progress on others. I have a project list, and the controller is #3 on that list. I have to finish my heater first, then I have one very special project before I get to my AC Inverter (156 volts). I still haven't located the pinouts for my encoder, but I might work on that this week.

I did find out that the DMOC/UMOC440 controllers uses CM400DY-12H. I have access to a full unit, so I will take pictures and try to make a basic schematic of it.