Parallel Diodes

[ivconic]

Talking just about some or any "parallel diodes" is abstract and trivial.
Effect of parallel diodes is directly defined and dependent on diode types.
No uniform explanation, no universal solution.
End of a story.

[deemon]

This "parallel diodes war" lasts too long and looks like old joke that everybody knows but I don't ... So can anybody show the initial circuit with these diodes - I want to understand what is funny here

[Davor]

You didn't miss much. It's just troll/marketing science (how to shove a ridiculous amount of unsuspecting parts in a single box and not causing them to give up smoke). There is no reasonable explanation to the whole notion, just a few resident trolls making silly excuses. No hobbyist in his right mind would ever look at this twice, unless for a joke or two, yet Carl threaten us all not to do that.

[clancy]

Aziz, I knows some academic papers say “current balancing” resistors be required for parallel diodes, and this be true when diodes NOT good thermally connected AND they get hot.

What interest me be reality for different condition.


This be real life practicals; parallel diodes share current very good (same type and manufacturer) if:

A. They not get much hotter than ambient, OR

B. They good thermally connected and then they can get >> hotter than ambient.


Real measurements I do for A. and B. shows empirically current difference <20% worst case for many different Si diodes, typically few %.

I also try high current pulsings with small duty cycle so diodes not get hot. Same result; parallel diodes share current very good.

[Carl-NC]

Talking just about some or any "parallel diodes" is abstract and trivial.
Effect of parallel diodes is directly defined and dependent on diode types.
No uniform explanation, no universal solution.
End of a story.

Agreed. Time to move on, folks.

[WM6]

This "parallel diodes war" lasts too long and looks like old joke that everybody knows but I don't ... So can anybody show the initial circuit with these diodes - I want to understand what is funny here

Her you are:

[deemon]

As for me , I can see only one purpose of these parallel diodes ( used as a voltage limiter here ) - to decrease their forward drop in order not to open the body diode of the Q12 mosfet . It's the only reason here for 2 diodes to be better than one