Can someone tell me what does the "E" source on the schematic of Fig. 3 of the paper (follow liink) mean?

Question

Schematic on Fig. 3 has an "E" source under V1...what is it?

http://subscribe.interferencetechnology.com/ArchivedArticles/filters/26_ag_06_debraal.pdf?regid=

Answer 1

V comes from "voltage" and E from "electromotive force" a.k.a EMF .

I suspect that the EMF is the induced voltage from the inductor

Answer 2

a battery or DC source.

Answer 3

E represents the common mode noise voltage that the filter is designed to attenuate.  E will be modelled as a complex voltage source with a power spectrum (amplitude vs frequency) that simulates the kinds of electromagnetic interference that would be seen by the filter.

There are even standard power spectra that can be modelled, if you wanted this filter to be accepted by:

- the European Union (a 'CE' mark)

- the FCC (several standards, i.e. "Sec 15 partB")

- the EIC

- the military (i.e. MIL-STD-462)

- even McDonalds has their own very strict standards for equipment in their restaurants.

Modelling the E source after the power spectrum in one of these standards, and finding the filter will reject the signal coming from E, would earn the "stamp of approval" from that EMI standard.

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