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Old 5th November 2013, 05:07 PM   #1
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Default diode in parallel in rectifier

can i parallel the diodes in bridge rectifier ckt for increasing current ?
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Old 5th November 2013, 05:36 PM   #2
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When you put diodes in parallel, you must put a low value resistor in series with each diode so that they can share the current. Diodes don't always conduct at the exact same voltage. The resistors allow a slight bit of voltage drop on each diode.
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Old 5th November 2013, 06:11 PM   #3
PIZ is offline PIZ
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The ressistor has not to be necessary...with rising current through a diode the forward voltage will rise too, so the parallel diode takes more of the current.
If the diodes are the same type it should generally work...how ever I would not double the maximum current ability with two diodes...would recommend a 1,5x max
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Old 5th November 2013, 09:43 PM   #4
sreten is offline sreten  United Kingdom
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The problem is forward voltage drops with temperature
so you cannot rely on diodes to reliably share current,
one diode can current hog, so no resistor is wrong.

Bigger diodes as a replacement is the proper way to do it.

rgds, sreten.

Last edited by sreten; 5th November 2013 at 09:46 PM.
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Old 7th November 2013, 04:39 PM   #5
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What has this to do with Aksa?You're at the wrong thread
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Old 7th November 2013, 04:44 PM   #6
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I agree with you sreten. My reply was in response to the OP question.
It's really not a good idea to parallel diodes. Even if you can balance the current through the multiple diodes, the necessary resistors will cause a sag in the voltage as the current increases.
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