Paul and Sabrina's Cheap 3 Phase Inverter (AC Controller) with Field Oriented Control - Page 8 - Fuel Economy, Hypermiling, EcoModding News and Forum

Tweety · 11-22-2009, 08:47 PM

Unfortunately we didn't win...

I got distracted the last few minutes by my family... So no second bid in time...

MPaulHolmes · 11-23-2009, 12:06 AM

It's all good in the hood! Family does that! My son, in particular. sort of feisty... I really appreciate your willingness to help me. Thank you! Say hi to PIPPI for me!

esoneson · 11-23-2009, 01:55 AM

Good deeds abound! Folks thanking folks for generous support.....common goals.......lending helping hands......a lot of good brothers and sisters out there. We should celebrate all of this activity with some sort of holiday epitomizing this universal feeling.....wait..........wait.........just a couple of days..........

Happy Thanksgiving to one and all........especially to those who don't have a national holiday for this phenomenon!

MPaulHolmes · 11-23-2009, 02:54 AM

haha! Yes, happy thanksgiving! I can't wait to eat tons and tons!

I am making excellent progress on the software. I've got all 6 PWMs working, in complementary mode, so that when 1 is on, the other is off. 3 pairs like that. That's perfect for synchronous rectification too, by the way! I even programmed in some dead time to prevent shoot-through (like a short circuit). I'm half way done with programming the A/D inputs. I have it set so that 4 A/D samples happen at the exact same time! This chip is freakin awesome!

I also learned about 1.15 fractional format for decimals today. The A/D converter can put the result in fractional format (sort of like floating point). That's the option I chose. It stores the number from -1 to 1, with several decimal digits of accuracy! hehe.

I programmed the timer to run at 10 kHz, but that's not set in stone. I want to optimize it for the used IGBTs on Ebay which are slower.

Tweety · 11-23-2009, 06:31 PM

Paul, would these be considered fun to play with? Or are 300A to little?

PRX CM300DU-24F IGBT Power Modules 1200V 300A - eBay (item 370281309129 end time Nov-26-09 12:02:43 PST)

mrbigh · 11-23-2009, 06:47 PM

Quote:

Originally Posted by Tweety

Paul, would these be considered fun to play with? Or are 300A to little?

PRX CM300DU-24F IGBT Power Modules 1200V 300A - eBay (item 370281309129 end time Nov-26-09 12:02:43 PST)

These are "almost" the same ones I have waiting for the next controller project (powerex CM300DY-24H)DUAL 300 Amps/1200V.

Tweety · 11-23-2009, 07:38 PM

These are duals... At least according to the spec sheets...

mrbigh · 11-23-2009, 09:05 PM

Quote:

Originally Posted by Tweety

These are duals... At least according to the spec sheets...

According to the published specs, the 24H will dissipate more watts through the base plate, it has a larger number of working gate saturation and this one has less total weight. Basically, minor details.
I think that these are great devices for the money (ebay auctions), retail are over 300 a piece

MPaulHolmes · 11-24-2009, 12:11 AM

I think it looks really good too. You could probably get away with 300 amps for very brief periods of time. That would work out to the same power as 150v 600amp I suppose, since I would probably run it at 300v 300amp. Most of the time it would stay way below 300amp. I think that would work. And $75 for 3 buy it nows would be enough for a 6 pack. That's cheap. If I had to guess at the total inverter parts cost, it would be around $200-300 in this case. My goal with this project would be to use IGBTs that could be gotten from Ebay. They don't seem to have a shortage for some reason.

The problem with the 6 pack that we didn't win is that it would be a one-off controller. You aren't going to find that sort of thing normally. If it turns out to be too low of power, the 1200v 600amp ones go for $50 each, but if this power turns out acceptable, that would be perfect. It's funny that an AC Space Vector drive will probably turn out to be cheaper than the Open Revolt DC controller, assuming the Ebay IGBT supply stays around! hehe. That's funny.

mrbigh · 11-24-2009, 09:20 AM

Quote:

Originally Posted by MPaulHolmes

I think it looks really good too. You could probably get away with 300 amps for very brief periods of time. That would work out to the same power as 150v 600amp I suppose, since I would probably run it at 300v 300amp. Most of the time it would stay way below 300amp. I think that would work. And $75 for 3 buy it nows would be enough for a 6 pack. That's cheap. If I had to guess at the total inverter parts cost, it would be around $200-300 in this case. My goal with this project would be to use IGBTs that could be gotten from Ebay. They don't seem to have a shortage for some reason.

The problem with the 6 pack that we didn't win is that it would be a one-off controller. You aren't going to find that sort of thing normally. If it turns out to be too low of power, the 1200v 600amp ones go for $50 each, but if this power turns out acceptable, that would be perfect. It's funny that an AC Space Vector drive will probably turn out to be cheaper than the Open Revolt DC controller, assuming the Ebay IGBT supply stays around! hehe. That's funny.

These surplus IGBT's (in general) had been in ebay since over 5 years and
seems that the supply never ends, and this is very important, everybody interested in building this type on controller, can pick and choose their vendor/auction accordingly to their budget (parts withing certain spec's) and the parts "stocking" principal investment for the available KITS is minimized.
Taking an aproach in design of escalable Amperage increase could be an option, 300,600,900,1.2 KW, 1.5KW amps comtrollers by adding extra dual IGBT devices.