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Forum Index : Electronics : IGBTs
| Author | Message | ||||
KarlJ Guru  Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
Any chance someone can suggest a project to use these? I have sh*tloads of them salvaged from grid connect inverters (also have an almost limitless supply of 1.5/ 2kw and 3kw aerosharp inverters for an OZ inverter project. Tinker is nearby to me but havent seen him in A while. DOW Brand PN DM2G50SH6A/N N ones rated to 75A 600V A ones 50A 600v Looks a sh*t load easier than MOSFETs for connections to inverter projects. Cheers Karl Luck favours the well prepared |
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Madness Guru Joined: 08/10/2011 Location: AustraliaPosts: 2498 |
They would be good if you have a 380V battery bank. There are only 10 types of people in the world: those who understand binary, and those who don't. |
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| joebog1 Senior Member  Joined: 07/11/2015 Location: AustraliaPosts: 114 |
I check EHT with my fingers!! I doubt I will be checking a 380 volt battery bank though  The ratings are backwards !! it would be nice if they were rated at 600 amps and 50 or 75 volts Joe |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
I cannot find a datasheet for these IGBTs, do you have a link ? If I can get some info I may be interested. Cheers, Tony. |
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| KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
does this help? http://www.shaoguang.com.cn/english-ver/d_igbt_1.htm Luck favours the well prepared |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Here is the full form data sheet with picture of the device. http://www.shaoguang.com.cn/pdf2/igbt/DL2G50SH6A.pdf Its a fairly decent IGBT, but the package is a bit unique. Cheers, Tony. |
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oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
Warp... are the drive requirements the same for the fets as the igbt? ie are they relatively interchangeable? ... have a mountain of 50 and 60amp igbt from the inspire inverters, may make a decent little inverter to play with ? ...........oztules Village idiot...or... just another hack out of his depth |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Drive requirements are the same, but there are some other significant differences. The first is switching speed. Both turn on damned fast, and a mosfet turns off very fast too. But an IGBT is slower at turn off, so switching speed is not so fast for older IGBTs but the latest ones are quite capable switching efficiently at 20 Khz, but not much beyond that. If it came out of a grid tie inverter running at 20 Khz, it should work just as well in a home brew PWM inverter at that speed. Now the more interesting part, conduction losses. Mosfets while "on" behave like a low value resistor. That means at very low current the conduction voltage drop is very low, and so are the losses. But... as current rises, the voltage drop also rises, and power loss as heat rises square law. (I squared R). This makes mosfets much less efficient at very high power, unless you use a lot of them. The on resistance also rises very rapidly with the voltage rating. Fifty volt rated mosfets will have a much lower Rdson than five hundred volt rated mosfets. So for low voltage inverters mosfets will beat anything else easily for losses. Now IGBTs have very different conduction characteristics. They tend to have a fairly constant voltage drop of typically around two volts. Its not exactly constant, but it almost is over a very wide current range. You can immediately see that at low current, such a voltage drop would be a great loss. but as current rises, the power loss goes up almost linearly, not square law like a mosfet. So at very high power an IGBT will be better, but only at higher voltages. A 500 volt mosfet is a miserable lossy thing because of its high "on" resistance, but a 500 volt IGBT will beat it easily for conduction loss. And the higher the current, the more superior IGBTs are. So you tend to see IGBTs used in high voltage grid tie inverters, and mosfets used in low voltage battery driven inverters. There is probably a crossover point somewhere, but where that is depends on the circuit, and how the device is used. In my own 2Kw MPPT solar controller that runs with around 200v to 300v solar input and 230 volt regulated dc output, I can use either a single mosfet or a single IGBT. The mosfet has lower switching loss but higher conduction loss, the IGBT lower conduction loss and higher switching loss. Its a toss up. But in the end a 600v 48 amp mosfet is slightly better, especially at low average power and not flat out 2Kw. So after all the words, your IGBTs would make a great inverter if the input voltage is pretty high. At a guess, say 200v input or higher. If you are running a battery at less voltage than that, mosfets might be a better choice, but the exact operating conditions and characteristics of the device you plan to use needs to be considered on a case by case basis. End of rant. Cheers, Tony. |
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| oztules Guru Joined: 26/07/2007 Location: AustraliaPosts: 1686 |
Enjoyed that very much thanks Warpspeed. ....oztules Village idiot...or... just another hack out of his depth |
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yahoo2 Guru Joined: 05/04/2011 Location: AustraliaPosts: 1166 |
I am in the middle of an aerosharp drought here in South Oz at the moment, I would seriously consider smuggling some across the border if things dont change soon. Perhaps I am just not talking to the right people. I'm confused, no wait... maybe I'm not... |
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| KarlJ Guru Joined: 19/05/2008 Location: AustraliaPosts: 1178 |
IGBT = now educated THANKS. (now destined for the bin) SO - had a dozen inquiries for said Auerosahrp toroids. I've been led to believe that a 3kW aerosharp torroid core can use the existing secondary and you can build an inverter with it. (elected to scrap the 1.5/2kW ones as they babies in comparison. Shipping of the whole unit is prohibitive as they weigh a ton. I have a bored guy stripping off the original primary windings for peanuts. This leaves something much smaller (still bloody heavy) with only the original secondary + iron core remaining. I'm based in Perth can ship anywhere in Aus. Asking $40 a pop + the freight. (cut down the cost of freight by $40 or more over full unit) I might be barking up the wrong tree but if anyone wants them or other bits send me an email at work wholesale@solargain.com.au I'm tempted to build an off grid inv. just cannot see what on earth i'd use it for. spoiled i have the grid and some Enphase batteries to cover peak times. Karl Luck favours the well prepared |
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