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Power Over Ethernet Interoperability Guide by Sanjaya Maniktala

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Appendix: Modeling and Analysis of the Combination-Wave Generator Used for Surge Testing (EN 61000-4-5)
The CWG Circuit
The CWG circuit was shown in Fig. 11.9. That is the one to refer here.
From Fig. 11.9 we see that in the s-plane
image
Mathematical Analysis
At time t = 0, the capacitor C is fully charged (to Vdc). The initial condition of the cap is described as a step function:
image
At the very moment the switch is thrown, we also assume that the applied-voltage source, Vdc, is simultaneously removed. This is equivalent to assuming a large enough ...

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