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  #21  
Old 01-15-2017, 05:49 PM
yooper yooper is offline
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Originally Posted by Rufus View Post
I don't have that kind of bridge rectifier. I am using 4 separate diodes like this one here. That is why I need 3 different heat sinks. One for the 2 bottom diodes as in the drawing and 1 for each of the top diodes.

Link to the kind of diode I have ordered.... http://www.ebay.com/itm/150A-POSITIV...-/261092065367


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Tim
This is what you should have ordered two of from your ebay seller .

http://www.ebay.com/itm/150A-NEGATIV...kAAOSwNSxU-R-0
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  #22  
Old 01-15-2017, 06:09 PM
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Or .. you could put those diodes on the shelf , take the easy way and order that bridge rectifier that I linked in your other post
I would, but I already spent the money for them

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Tim
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  #23  
Old 01-15-2017, 06:10 PM
Rufus Rufus is offline
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This is what you should have ordered two of from your ebay seller .

http://www.ebay.com/itm/150A-NEGATIV...kAAOSwNSxU-R-0
That would have made my life a lot easier. Next time I think I will give a little more thought into what I am doing.

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  #24  
Old 01-15-2017, 06:10 PM
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Rufus,
You need 2 heat sinks if they are big enough. Aluminum and copper are good heat and electrical conductors and are better then steel.

Here's how, hold my beer and watch this and and this
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  #25  
Old 01-15-2017, 06:16 PM
Rufus Rufus is offline
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Rufus,
You need 2 heat sinks if they are big enough. Aluminum and copper are good heat and electrical conductors and are better then steel.

Here's how, hold my beer and watch this and and this
That being the case then I am going to have to come up with some ginormous heat sinks. Looking back now I am wishing that I would have bought a bridge rectifier in the small package instead of those big diodes I paid for.

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Tim
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  #26  
Old 01-15-2017, 06:58 PM
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Originally Posted by Rufus View Post
That being the case then I am going to have to come up with some ginormous heat sinks. Looking back now I am wishing that I would have bought a bridge rectifier in the small package instead of those big diodes I paid for.

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Tim
Then you wouldn't have gotten the current capacity you need.

Heat sink size is dictated by what your running thru your diodes.
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  #27  
Old 01-15-2017, 08:09 PM
yooper yooper is offline
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Originally Posted by digger doug View Post
Then you wouldn't have gotten the current capacity you need.

Heat sink size is dictated by what your running thru your diodes.
Still not too late , for a paltry $42 order this , it will exceed the ampacity of you welder , you'll only need one heat sink and the heat sink won't have to be isolated and will easily fit inside the welder cabinet .

http://www.ebay.com/itm/like/2523312...&ul_noapp=true
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  #28  
Old 01-16-2017, 07:49 AM
Rufus Rufus is offline
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Would these heat sinks work?

http://www.ebay.com/itm/2-SMALL-ALUM...3D201759068399

I will also have a fan installed to use as forced air.

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  #29  
Old 01-16-2017, 08:37 AM
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do you know anyone working in IT?

PC processors will have big alloy heatsinks on them, find somwhere that takes in electronic waste nearby and bring some donuts/beers with you.


I'll have a stack of em going spare in a few weeks in work, but the shipping would take the good out of it.

dont get ones with pipes in them, they're sealed liquid convection cooling units, normally seen on servers. better cooling performance but kinda hard to drill holes in cos of the liquid inside! Ie you want something like this: http://www.ebay.com/itm/Dell-CPU-Hea...sAAOxyd5tRyLx6

not like this http://www.ebay.com/itm/OPTIPLEX-GX2...EAAOSwawpXt2NU


Pick up a laptop power supply and a few fans while you're at it and you can force cool them. None of this stuff should cost you anything if you can get friendly with the right person.
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  #30  
Old 01-16-2017, 12:49 PM
yooper yooper is offline
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Would these heat sinks work?

http://www.ebay.com/itm/2-SMALL-ALUM...3D201759068399

I will also have a fan installed to use as forced air.

Thanks
Tim
If you mount just one on diode on each and have a fan I'm sure they would be fine .
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