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Post by PinkFloyd on Jun 6, 2006 12:41:27 GMT
IN4007 I believe if I parallel them (2 x 1amp) we don't necessarily get a 2 amp diode as the one with the lowest voltage drop will eat more current than the other unless we put a small series resistor in series with each diode.
No rhyme or reason for "wanting" to parallel 2 x 1amp IN4007 other than pure inquisitiveness and to see if it will work, and if not how to get it to work, Hand matching the forward voltage should ensure even distribution of current through each diode? and stacking them side by side will distribute the heat effectively? this is a question for Rickster.
If one diode steals all the current it will heat up hogging even more current until it's trying to carry all of it so to ensure even distribution we either fit a suitable series resistor, we hand match the diodes or we just use 1 suitable diode of the correct rating we want......
This has always interested me and I have never been able to get a definitive answer from anybody on the subject of paralleling diodes. I have stacked them before with no bad results but some people claim this is very bad practice and should be avoided at all costs... yeh, we know the disadvantages but I wonder if there are any advantages to be gained by paralleling say 5 x 1amp tightly matched diodes together over 1 x 5 amp diode?
Over to you Rickmonster...........
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rickcr42
Fully Modded
Rest in peace my good friend.
Posts: 4,514
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Post by rickcr42 on Jun 6, 2006 12:53:10 GMT
I have read that diodes in parallel can increase the current rating but diodes are a non-linear device probably so maybe not a real good idea since results may be unpredicatable in the start up area even though the actual voltage drop will be identical.
A diode with a higher current rating to begin with a better way I think unless for some reason you have no access to higher current devices in which case maybe not a choice but a need
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