Is this enough Heat Sink??

[TomW]

Folks;

With the new 12 footer going in it has become obvious I will finally need an automated dump load setup. The days of simply using more from observation will be gone.

Prior to the 12 footer going in my batteries could simply absorb all of my incoming potential [90 amps absolute max].

Anyway, Ghurd is building me a controller and we will be driving this setup to switch the dump load I am also building:

That is a Toshiba MG150Q2YS1 IGBT which is rated for 150 amps.

My question is: Assuming I drive 150 amps through this thing will this heat sink be sufficient? That AL slab is 3" by 12 inches and 3/4 inch thick the fins supply about 130 square inches of fins. I have a couple 24 volt fans I will probably ad anyway.

Personally, I think it is overkill but those IGBT are quite expensive and since I got them used for free I hate to blow one up by overheating. Thanks to Dean Drives for passing them on.

I actually do not expect to go beyond 70 or 80 amps through this but I believe in overbuilding where possible and derating electronic components for increased life and less stress.

Ideas or opinions appreciated.

And before final assembly I will clean it all up and use thermal grease so it should work well.

Thanks for looking.

Trying to fix a typo and it is on the 8th or 9th try and getting errors may leave it if this click doesn't post.

Tom

[ghurd]

Nice!

G-

[gizmo]

Looks good Tom. To work out if its big enough you would need a lot more info about the IGBT, like its on resistance, and the dump load resistance and your system voltage. Then you could work out the power dissipated by the IGBT, and then use some other maths to see if the heatsink can dissipate that much heat, depending on the ambient temp, etc.

Or, you could poke it with your finger. If you can hold your finger on it for a few seconds, its ok. If the sweat on your finger sizzles, its too hot.

Glenn

PS. I see the IE preview/post bug is fixed.

[willib]

MG150Q2YS1

These two say the the last number is a series number

http://cs.utsource.net/goods_files/pdf/97/97446_ETC_MG150Q2YL1.pdf

http://cs.utsource.net/goods_files/pdf/97/97411_ETC_MG150G2YK1.pdf

These two are the closest i could find !

so i'm not sure if the series 40 and 51 are the same as the series 1.

http://cs.utsource.net/goods_files/pdf/31/31023_TOSHIBA_MG150Q2YS40.pdf

http://cs.utsource.net/goods_files/pdf/31/31025_TOSHIBA_MG150Q2YS51.pdf

i would not hook up anything to it till i was absolutly sure what was inside.

[hiker]

glad to see a new member -welcome.......... :}

could try a computer fan hooked up to your heat sink.heat switch actavated...

[ghurd]

Just a thought.

If it gets warm, could use the AL heat sink stuff from a microwave, and those "AL welding rods" to fasten it to the big block.

Might take an oxy-acetylene torch to get the main part hot enough to "weld".

Those AL microwave magnatron things are pretty heavy, with a good surface area.

G-