Electronics > Beginners

Diodes in parallel.

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Zero999:

--- Quote from: wraper on July 18, 2018, 10:28:04 am ---
--- Quote from: Hero999 on July 18, 2018, 10:24:38 am ---
--- Quote from: wraper on July 18, 2018, 01:36:35 am ---
--- Quote from: Rick Law on July 18, 2018, 01:27:28 am ---So from my understanding of your reply, it would appear that I am okay as long as if my total current is not exceeding the rating for each individual diode.

--- End quote ---
But then there is no point doing this.
--- End quote ---
Lower volt drop.

I can see what you're saying, but in practise it does work. The current sharing isn't perfect, but it's enough to give a lower voltage drop, than what one would expect using a single diode.

--- End quote ---
It's pretty crappy way to decrease the voltage drop to begin with. As BrianHG suggested, if you want low voltage drop, use MOSFETS.

--- End quote ---
It's much simpler than MOSFETs and I can assure you, it works quite well.

wraper:

--- Quote from: Hero999 on July 18, 2018, 10:42:22 am ---It's much simpler than MOSFETs and I can assure you, it works quite well.

--- End quote ---
Not any better than choosing beefier diode and not having any downsides.

Zero999:

--- Quote from: wraper on July 18, 2018, 10:54:49 am ---
--- Quote from: Hero999 on July 18, 2018, 10:42:22 am ---It's much simpler than MOSFETs and I can assure you, it works quite well.

--- End quote ---
Not any better than choosing beefier diode and not having any downsides.

--- End quote ---
Beefier diodes often work out more expensive, since it's often cheaper to buy a larger quantity of smaller diodes, than a single big one.

sourcecharge:
zeners in parallel work.  multiple 1n4740 in parallel increases the total current capacity.

ArthurDent:
As others have pointed out, using bigger/more diodes can create problems with reverse leakage/unequal current sharing.  Here is a good simple video that covers what you are trying to accomplish. A single cheap mosfet can work in most applications. Because mosfets are basically low value resistors when turned on they would be much easier to parallel without any added equalization circuitry if you needed really large currents.

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