Post #8 last link is the correct way, if the converter is regulated.How to estimate "input impedance of the switching power supply" as mentioned in "Input Filter Design for Switching Power Supplies" document.
I think (current flows from bridge rectifier - ive to the auxiliary supply -ive ).
2) Supply was swtiched off . (the on off switch breaks one of the two AC lines)
Two possible conclusions:As it says in snva538 by ti.com, the corner frequency of the input filter should be much less than the feedback loop crossover frequency of the smps.
So with a PFC input….you have to be mindful that the loop crossover is only 10Hz or so.
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