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Tool Talk Discussion Forum

Re: Schumaker Battery chargers got around to looking

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01-28-2013 06:09:46

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Diodes do NOT work well in parellel. One will carry all the current and the other will carry none.

Cliff(VA) EE

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01-28-2013 06:26:21

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 Re: Schumaker Battery chargers got around to looking in reply to Cliff(VA), 01-28-2013 06:09:46  
Quoting Removed, click Modern View to seeCliff, that depends on how the paralleled diodes are matched. Chip makers even sell matched diodes exactly for this purpose. I have successfully paralleled as many as 5 matched diodes, all sharing current within 10%. Found often it welders. Even if you don't buy matched sets, simple selection will get you close enough for home projects. Their very nature makes them want to share, i.e., as current goes up in one, so does its voltage drop (particularly in the intrinsic materials), so that results in the other diode (which had the higher initial junction drop) taking on more current.......not as perfect as matched sets, but still sharing. If you parallel a 1 amp diode with a 100 amp diode, they will not share very well!

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01-28-2013 09:30:28

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 Re: Schumaker Battery chargers got around to looking in reply to JMOR, 01-28-2013 06:26:21  

You and I have had this argument before. And I agree that matched diodes will share current to a degree.

But most on this board do not know how to match diodes or even that they need to be matched. It can make for some explosive fun.

Unless you know what you are doing, either buy matched diodes or don't parellel them.


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01-28-2013 10:36:43

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 Re: Schumaker Battery chargers got around to looking in reply to Cliff(VA), 01-28-2013 09:30:28  
Quoting Removed, click Modern View to see "Unless you know what you are doing..." very important to nearly any undertaking! :wink:

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