How to do Thermal Impedance modelling for Foster circuit?

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Hi All

I have followed the demo buck converter model for understanding thermal modelling. Now I have few questions:

  1. I have extracted the Ri, Ci… parameters of foster circuit from datasheet for calculating Zth_Jc (junction to case thermal impedance). I want to verify these parameters by giving the power input to this foster circuit and observe the junction temperature. e.g at Ambient temp = 25 C, power dissipated is 92 W, R1 to R4 = 0.1746 0.6273 0.6306 0.0033, C1 to C4 = 0.0094 0.9217 1.1628 0.3433

How do I give an input of 92 W to this circuit? Is there a block of heat flow to physical signal converter available in plecs? How do I model this circuit?

Thanks

Sneha

2

Hi Sneha,

Actually, yes. In the thermal domain component library there is both a Constant Heat Flow block and a Controlled Heat Flow block, whose input signal is generated in the Control domain. You can then place a Thermometer at the desired node and view the resulting temperature.

Best,

Kris

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Thanks Kris.