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Testing Methodology Discussion Questions and comments regarding the testing methodologies used on jonnyguru.com

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  #1  
Old 03-15-2017
OneTreeHill OneTreeHill is offline
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Join Date: Nov 2014
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Default Ripple Measurement

Hi folks. I've gathered all the equipment for the power supply for a short time. My first victim HX750i. I did all test and last test ripple measurement. But I think it's a problem with measurements. Especially 12V channel.

OSC Rigol 1054z(Hacked 100 MHZ) I build own DC Load and Text Fixture. I followed intel atx spec.

http://i.imgur.com/rIEJDVE.jpg
http://i.imgur.com/RWILBl1.jpg

Channel 1 -12V- Channel 2 -5V- Channel 3 -3.3V- Channel 4 -5VSB-
PSU OFF

http://i.imgur.com/3iwlOS2.png

%0 Load

http://i.imgur.com/FHhZcHX.png

%10 Load

http://i.imgur.com/YbcmrmE.png

%20 Load

http://i.imgur.com/39FWESP.png

%30 Load

http://i.imgur.com/Rdk9bHH.png

%40 Load

http://i.imgur.com/nC3cqk0.png

%50 Load

http://i.imgur.com/ZRc19yu.png

%60 Load

http://i.imgur.com/hnzpF6n.png

%70 Load

http://i.imgur.com/vSITJZG.png

%80 Load

http://i.imgur.com/hT1VpqQ.png

%90 Load

http://i.imgur.com/OGZMpHp.png

%100 Load

http://i.imgur.com/KFeEDrI.png

%110 Load

http://i.imgur.com/i2sY3pt.png



CL 1

http://i.imgur.com/d0y3F0S.png

CL 2

http://i.imgur.com/TIBfTZV.png

What are you thinking? Have you observed an abnormal condition in the results?
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  #2  
Old 03-15-2017
crmaris's Avatar
crmaris crmaris is offline
Cybenetics CTE
 
Join Date: Jan 2010
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Default

Its switching controller operates at Missing Cylce (MC) mode under light loads and this increases ripple during your 10% test. However as it seems you should calibrate your loads since your 10% load is actually lower, because I didn't have this ripple in my HX750i sample with true 10% load. Else in your sample the controller is tuned slightly different since with the use of the proper circuit its MC mode can be adjusted. I have also noticed this in the HX1000i review and in general most LLC topologies have it under light loads.

https://www.techpowerup.com/reviews/...HX1000i/9.html
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