Engineering Systems Modeling Question (First order thermal circuit)

AI Thread Summary
The discussion revolves around simplifying a thermal circuit of a computer CPU to two lumped capacitances and resistances. Participants emphasize the importance of understanding equivalent circuits for accurate thermal profiling. Clarifications are made regarding the placement of capacitances and resistances, noting that the original circuit's configuration differs from the simplified version. One user expresses confusion over the visual representation of the circuit and seeks confirmation on its equivalence. The conversation highlights the need for a clear understanding of thermal circuit modeling in electronics.
KingDaniel
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Homework Statement


I have a problem with understanding the thermal circuit I attached to this thread. Please help. It's a Thermal circuit of a computer CPU that needs to be simplified to have just 2 lumped capacitances and resitances. How would one go about doing that? along with the equations?

IMG_0454.JPG
 
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This is what they simplified it to but I don't understand it:

IMG_0455.JPG
 
I tried to picture it like this but I'm not sure if it's right:

IMG_0456.JPG
 
KingDaniel said:

Homework Statement


I have a problem with understanding the thermal circuit I attached to this thread. Please help. It's a Thermal circuit of a computer CPU that needs to be simplified to have just 2 lumped capacitances and resitances. How would one go about doing that? along with the equations?

View attachment 86866
that is as simple as you are going to get it without losing data. Why are you trying to simplify it?

If you only need the thermal profile at one location you can use equivalent circuits to simplify i guess.
 
@donpacino , okay, but is my circuit the same as their version of the circuit? Cause I'm trying to comprehend it in terms of an electrical circuit analogy but their drawing just looks weird...
 
your circuit is not equivalent. If you look, the capacitances go to ground, not across the resistances.
 

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