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LAN_403

audio:deviant

Mon Jun 15 2009, 04:04PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

hello this might be a silly question, i was going to use a couple computer heat sink's but they wont fit on the eastern voltage half bridge printed board. so my question is can i mount them elsewhere and wire them to the board or will this cause too much resistance issues?

HV Enthusiast

Mon Jun 15 2009, 04:21PM

Registered Member #15 Joined: Thu Feb 02 2006, 01:11PM
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Posts: 3068

The IGBTs should installed directly on the board to minimize inductance.

If you don't have a heatsink, you can always use a piece of heavy aluminum and then attach a fan or heatsinks to the aluminum. If the aluminum is heavy enough, you might not even need a fan or heatsink (for shorter runtime durations). (By heavy i'm thinking about 1/2" or thicker)

Renesis

Tue Jun 16 2009, 05:46PM

Registered Member #2028 Joined: Mon Mar 16 2009, 08:13PM
Location: Norway
Posts: 319

If the aluminum is heavy enough, you might not even need a fan or heatsink (for shorter runtime durations). (By heavy i'm thinking about 1/2" or thicker)

And if you have access to a mill, or have a steady hand and a hacksaw, those cooling fins are not far away

audio:deviant

Wed Jun 17 2009, 02:08PM

Registered Member #2081 Joined: Wed Apr 15 2009, 11:36AM
Location:
Posts: 78

okay that makes sense. was thinking of putting a piece of aluminum across both of them round about 100mmx100mm 4mm and then attaching a computer cooling fin with a fan onto that, something like that

would that work for dissipating heat, this is kind of the reason why i wanted to mount them else where because there is not enough room to fit 2 heat sinks when attached to the board.

Nicko

Sat Jul 04 2009, 05:12AM

Registered Member #1334 Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615

The company I work for just sent over 30 HP desktops for recycling - they have lovely heatsinks with fans - I've used 2 for a nice half-bridge and having spent a satisfying hour with a battery drill, I now have a good stock of these, fans & PC PSUs...

One thing to watch for is that some CPU heatsinks have inbuilt heat pipes to improve thermal transfer from the top of the CPU to the fins - do not, under any circumstances, drill into these... They don't contain anything particularly nasty, they just won't work nearly as effectively again.

brtaman

Sat Jul 04 2009, 10:17AM

Registered Member #2161 Joined: Fri Jun 05 2009, 03:36PM
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Posts: 247

Nicko wrote ...

One thing to watch for is that some CPU heatsinks have inbuilt heat pipes to improve thermal transfer from the top of the CPU to the fins - do not, under any circumstances, drill into these... They don't contain anything particularly nasty, they just won't work nearly as effectively again.

That is not always true, Nicko, I hate false information being spread...sometimes heatpipes use dihydrogen monoxide as the working fluid and we all know what health risks are associated with it...We can't have members being poisoned or even worse by reading your inaccurate information. ;)

Nicko

Sat Jul 04 2009, 11:09AM

Registered Member #1334 Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615

brtaman wrote ...

That is not always true, Nicko, I hate false information being spread...sometimes heatpipes use dihydrogen monoxide as the working fluid and we all know what health risks are associated with it...We can't have members being poisoned or even worse by reading your inaccurate information. ;)

Thanks for the correction - you are, of course, completely right - a dangerous omission on my part - see:
http://www.dhmo.org for more information about DHMO, also more commonly known as Hydric acid.

As long as its remains contained in the heat pipe and doesn't get into the environment, you are completely safe - This is also one of the main reasons that PCs have to go to safe recycling depots in Europe (the WEEE directive) - there is a lot of DHMO in WEEE...

TheBoozer

Sat Jul 04 2009, 12:47PM

Registered Member #1535 Joined: Wed Jun 11 2008, 11:37PM
Location: Northeastern Pennsylvania - USA
Posts: 117

Dihydrogen Monoxide wiped out nearly all of New Orleans back here in the USA a few years ago..... What a mess.

Fraggle

Sun Jul 05 2009, 01:45PM

Registered Member #1526 Joined: Mon Jun 09 2008, 12:56AM
Location: UK
Posts: 216

I didn`t know that heatpipes used Dihydrogen Monoxide, doesn`t it have too high a boiling point?

Nicko

Sun Jul 05 2009, 03:01PM

Registered Member #1334 Joined: Tue Feb 19 2008, 04:37PM
Location: Nr. London, UK
Posts: 615

Fraggle wrote ...

I didn`t know that heatpipes used Dihydrogen Monoxide, doesn`t it have too high a boiling point?

Quite a good resource on Heat Pipe Design,,,

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