kingpincooling.com

Go Back   kingpincooling.com > Overclocking & Modding > Hardware Modding

Hardware Modding Soldering, deciphering datasheets, tricks and tips.

Reply
 
Thread Tools Search this Thread Display Modes
  #1  
Old 08-07-2010, 08:00 AM
nigel's Avatar
nigel nigel is offline
Sub-Zero
 
Join Date: Jan 2010
Location: Belguim
Posts: 169
Send a message via MSN to nigel
Default wondering about load testers (cpu)

wel yeah its me again

I was wondering about those load testers that several people use to test there phase change units...

They are talking about loads up to 220W. But whats under the hood of those things?
And also how ore where can you find how much heat a cpu creates in W...

They kinda lost me on this ^^

I hope what i say makes sence?
__________________
http://nigelpoint.blogspot.com/


The duck is here together with the Frozen Duck
Reply With Quote
  #2  
Old 08-07-2010, 08:10 AM
TiN's Avatar
TiN TiN is offline
Volt-Nut :)
 
Join Date: Jan 2010
Location: Taipei
Posts: 1,458
Send a message via ICQ to TiN Send a message via Skype™ to TiN
Default

high-power MOSFET and current control curcuit (usually simple operational amplifier with Vdac/Vtrimmer input). It's actually few-parts curcuit. And power rating limited only to mosfet (and it's package), I've made some up to 500W no problem.

As for CPU, the only way is to measure it. Usual P = I * V but need very fast or custom wattmeter.

I've measured Q6700 and E8600. Already published data from there somewhere here.
__________________
xDevs.com
Reply With Quote
  #3  
Old 08-07-2010, 09:17 AM
nigel's Avatar
nigel nigel is offline
Sub-Zero
 
Join Date: Jan 2010
Location: Belguim
Posts: 169
Send a message via MSN to nigel
Default

thats a fast reply
And going to have a look at this and try to build me one just to see how well it works ^^ In terms of connecting the high-power MOSFET to a copper plate, adding a sensor and then wel mounting the cooler ^^

And for the CPU having a good look on google and different forums.

edit:
hmm sow this would be an option as a High-power MOSFET
http://www.st.com/stonline/products/...tp155n75f4.pdf

Ore am i looking at this a litle to simple
__________________
http://nigelpoint.blogspot.com/


The duck is here together with the Frozen Duck

Last edited by nigel; 08-07-2010 at 09:23 AM.
Reply With Quote
  #4  
Old 08-07-2010, 12:42 PM
Raja@ASUS Raja@ASUS is offline
Dry Ice
 
Join Date: Sep 2009
Posts: 288
Default

This article is rather old now Nigel, although the concept is the same. Worth a read if you are interested in learning more.

http://powerelectronics.com/mag/power_high_slew_rate/
Reply With Quote
  #5  
Old 08-07-2010, 12:48 PM
nigel's Avatar
nigel nigel is offline
Sub-Zero
 
Join Date: Jan 2010
Location: Belguim
Posts: 169
Send a message via MSN to nigel
Default

Thanks Raja

Going to read it right now ^^

edit,
intresting article, reading it a second time (my english is not that great ^^)
__________________
http://nigelpoint.blogspot.com/


The duck is here together with the Frozen Duck

Last edited by nigel; 08-07-2010 at 12:56 PM.
Reply With Quote
  #6  
Old 08-08-2010, 04:07 AM
TiN's Avatar
TiN TiN is offline
Volt-Nut :)
 
Join Date: Jan 2010
Location: Taipei
Posts: 1,458
Send a message via ICQ to TiN Send a message via Skype™ to TiN
Default

300w is ok for your mosfet. Maybe bit more, but 300 is safe as DS state.
__________________
xDevs.com
Reply With Quote
  #7  
Old 08-08-2010, 07:45 AM
nigel's Avatar
nigel nigel is offline
Sub-Zero
 
Join Date: Jan 2010
Location: Belguim
Posts: 169
Send a message via MSN to nigel
Default

DS state?

But I wonder what it actually needs :s

Because the current seems way to high in the data sheet...

If I am not mistaking, 20V to the gate
and 75V to the drain source



(oh and I don't want to be a pain in the .... just trying to get a handle on this )
__________________
http://nigelpoint.blogspot.com/


The duck is here together with the Frozen Duck
Reply With Quote
  #8  
Old 08-08-2010, 09:49 AM
TiN's Avatar
TiN TiN is offline
Volt-Nut :)
 
Join Date: Jan 2010
Location: Taipei
Posts: 1,458
Send a message via ICQ to TiN Send a message via Skype™ to TiN
Default

DataSheet - the holy bible

You need to see on dissipated power rate. PD value.
And get neccesary current * volts not to go beyond that PD keeping Tjunction in range below to +125C
__________________
xDevs.com
Reply With Quote
  #9  
Old 08-08-2010, 10:20 AM
nigel's Avatar
nigel nigel is offline
Sub-Zero
 
Join Date: Jan 2010
Location: Belguim
Posts: 169
Send a message via MSN to nigel
Default

oh okay
thanks ^^ going to make some sketches and try to do a simulation ^^

I will post the results here

edit: :doh: it seems that the mosfet is not in the database of Multisim ^^ wel lets see if i can add it to the database ^^
__________________
http://nigelpoint.blogspot.com/


The duck is here together with the Frozen Duck

Last edited by nigel; 08-08-2010 at 11:20 AM.
Reply With Quote
  #10  
Old 08-09-2010, 08:12 AM
nigel's Avatar
nigel nigel is offline
Sub-Zero
 
Join Date: Jan 2010
Location: Belguim
Posts: 169
Send a message via MSN to nigel
Default

hmm some people are saying I should use a big resistor instead of a Mosfet :s

now people are confusing me
__________________
http://nigelpoint.blogspot.com/


The duck is here together with the Frozen Duck
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 08:44 AM.

Contact Us - www.kingpincooling.com - Archive - Top
Powered by vBulletin® Version 3.8.3 Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.