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Hmm. That's strange. | by Longfist | 2014-12-31 07:35:09 |
| Looks like I'll end up paralleling a *BUNCH* of |
by LongFist |
2015-02-02 07:57:30 |
readily-available buck converters - still haven't found "the one" that I'm seeking - it needs to allow for up to 50VDC input and provide 36VDC output at about 25 A with 800W dissipation. I guess thatt's just impossible to attain, because I've Googled the heck out of it and got nothing promising back. I figured I'd grab several standard 36V 3A power supply and parallel them, but they "top out" at 75W dissipation. When you're moving 36V at, say 50W, you're only pushing 1.4A! (Since this will be continuous duty you really don't want to go much further than their "comfort zone" wattage without doing some truly herculean cooling systems). So I'm going to end up purchasing a major butt-load of these things and parallel them together to get the proper wattage and amperage loading necessary to drive the motor.
I just couldn't bring myself to scream for help on that, since I know how to Google and can readily do the math. I'm just surprised at the number of (other) EEs that just gave me a blank look and admitted no knowledge whatsoever.
Fear Factor Time: and this is true ignorance speaking here: What would the necessary isolation protocols be if I were to implement a series-parallel circuit of multiple DC power supplies.
50VDC -----+----------+----------+------------+----------+----------+-------
-----+----------+----------+
GND --o | | | | | | | | |
| | | | | | | | |
| | | | | | | | |
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
| 12V | | 12V | | 12V | | 12V | | 12V | | 12V | | 12V | | 12V | | 12V |
| 5A | | 5A | | 5A | | 5A | | 5A | | 5A | | 5A | | 5A | | 5A |
| 20W | | 20W | | 20W | | 20W | | 20W | | 20W | | 20W | | 20W | | 20W |
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
| | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | |
| +------+ +------+ | | +------+ +------+ | | +------+ +------+ |
| | | | | |
| | | | | |
+------------------------ | -------+------------------------ | -------+ |
| | | |
| +----------------------------------+----------------------------------
+
| |
| |
V o
+36V GND
15A
60W
Would/Could a circuit like this function? A matrix of power supplies seems like such a cheat, but it may turn out to be the only way I can get 50VDC in and 36VDC out with 25A at 800W. Apparently this technology was a lost technology known only to a precious few manufacturers. Because time is running out and I'm running low on options...
If only this was a rich High School instead of a poor one in the 'hood... |
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[ Reply ] |
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Discussion Forward -> In Board Discussion | by LongFist | 2015-02-03 06:42:45 |
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I wonder what happens when a power supply rated | by Longfist | 2015-02-08 17:45:48 |
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UPDATE - NEW PART FROM MAXIM | by wwill | 2015-02-15 08:42:02 |
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THAT'S IT! THAT'S WHAT I NEEDED!!! | by Longfist | 2015-02-15 16:38:17 |
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