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Thermal network transformation: Foster fourth order to Cauer first order?

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Diego Velazco
Diego Velazco 2019-7-19
移动：Sabin 2022-12-23
Hello, in the symscape power systems example "Loss Calculation in a Three-Phase 3-Level Inverter" there's a block of a half-bridge IGBT with loss calculation. I wanted to know how you calculated the junction to case thermal resistance and the junction thermal capacitance for this block, since the manufacturer’s datasheet only gives the R and C parameters of a fourth order Foster network, and from what I see in the example the junction to case thermal resistance and the junction thermal capacitance correspond to a first order Cauer representation.

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Carlos Rueda
Carlos Rueda 2019-12-19
移动：Sabin 2022-12-23
A method to find the equivalent Cauer network from the fourth-order Foster network is shown in Appendix A of book "Transient Electro-Thermal Modeling of Bipolar Power Semiconductor Devices" by Gachovska et al.

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Joel Van Sickel
Joel Van Sickel 2020-8-24
Moving Carlos Rueda's answer down here to clean up which questions are flagged as unanswered.
Carlos Rueda on 19 Dec 2019
A method to find the equivalent Cauer network from the fourth-order Foster network is shown in Appendix A of book "Transient Electro-Thermal Modeling of Bipolar Power Semiconductor Devices" by Gachovska et al.

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