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Ideal bridge rectifier

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lighthunter:

--- Quote from: Solarnewbee on October 12, 2016, 01:48:11 pm ---mine is a 3-phase pmg generator. anything out there for my situation?

SN

--- End quote ---
Look up DC2465, its a demo circuit that linear technologies put
together to use 3 of their LT4320 ics for 3-phase rectification.
While significantly more complex than the single chip single phase
design, it is still very much DIY possible. I think I will use it as single.
phase for a bit before trying the 3-phase version.

By the way i finally managed to get 3 ordered today from digikey for $8.44 ea.
i offered an ebay guy 8 and he countered at $20 each. I declined of course

Quote "Or was that the part you were avoiding?" Steve.

You nailed it ;D. LMAO.

Im good at repair/trblshooting, not so much with design, i have to edit too many times. ::)

LH

solarnewbee:
looked up the LT4320IDD or DC2465A-nd, its a board built for 3-phase input, 5vac-28vac rms 25a load max. Looks like it would be an ideal board since I don't design and build boards but at $126 each and I need 2 for my dual PMG well,,, it'll have to wait. I do appreciate the direction so I can keep it in mind when I do haul the windmill to the Philippines.

Have a great day!

SN

oztules:
Not sure it is worth playing with for wind genny. The 1/2 volt your trying to save is immaterial in the scheme of things, especially considering wild AC and loss of simplicity and robustness to handle it.

I bought a heap of 150amp 1500v diodes for very little, and that will rectify anything I may come up with, with no chance of failure.

If your paying for the losses from a finite source, it's a different risk reward profile.... but a wind genny.... emf is not the problem, and in fact losses may help the air/battery load matching, far more than the 1/2 volt sacrifice. A slight change in wind velocity will have a much greater effect in this case.


.............oztules

MadScientist267:
I'd have to agree with Oztules, especially given that the one pictured isn't all that much different in appearances from what I've got.

Having a hard time swallowing the idea that there's 3 $ digits worth of magic buried in there somewhere, given that I've vaguely mapped out the discrete component single phase version of it, and understand the principles at work on it. 3 phase tends to mix things up a bit when it comes to conversions, but dunno bout all that LOL





That's all there is to this one... no magic tricks, no black box chips... it's asymmetrical because of its intended implement, but that's little more than "details" really. Only thing that makes it even remotely "tricky" is the speed it's designed to run at, requiring everything be super-tight bunched... at the speeds you're looking at using something like this for, there's no real need. Nice thick source/drain paths and a little sinking, pffft no problem.

Side note along those lines regarding this particular board - the supply it comes from is rated 62A on the 12V rail - What you see is nearly what was there... only thing I removed was a little tab with a thermistor attached, to control the fan (externally done); and it only failed because it had months on end of *no* airflow (probably at something averaging half rated load or so). It's intended to sit directly under a fan and uses primarily the rails to wick and spread heat.

That said, I can't say one way or another about suitability for a wind turbine, I'm a solar guy... but put it out there because the premise of the topic is a fit under "ideal bridge".

If anyone is interested, I may sketch it up for my own use anyway at some point... squeaky wheels get the grease. Someone else would have to adapt it for 3 phase, as I have no foreseeable use for such a thing :P

Either way, the entire supply new is 80 bucks... and has at least 2 other "complete salvage" value sections in it... so IMO, 100+ for a dinky little board..? Well that's just gouging :-\

Steve

oztules:
For battery charging, the synchronous rectifier can be stupid simple... as you don't care about cross over.... for about 10volts or more on a 12v system to up to 44v for a 48v system.. so really  P channel and N channel fets, a resistor and a zenner should actually do the job just fine.

It can slow turn on from 0-10v as the wave increases, and we loose no power through the linear section, by the time we start to actually charge on the rising wave, we are fully turned on at say 10-11v... and still no current passes until we get up to 12v or more, where we are fully on anyway... and same for going down the back of the wave, we stay turned on until 0v, but pass no power during the 12v down to 0 volts so the losses are not there for either switching or anything else.... should be perfect, same for the p channel side.... so maybe only a handful of parts for a full synchronous rectifier.

Then it is worthwhile doing, say $30 for a 100 amp 12v system..... up to 100v for 4110 fets and P channel equivalents ( more of them for lower RDS on )... switching speed is irrelevant.

In 48v systems, the rds on may be no better than the diode route anyway....... but gee... for wind......seems a waste of time still.



..........oztules

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