Fig. 1
From: Supercapacitors with alternating current line-filtering performance
Reproduced with permission from Ref [32]. Copyright 2018. The Royal Society of Chemistry
a Electrical circuit diagram of AC line filtering and the conversion of AC line voltage into DC voltage; b plot of an impedance phase angle versus the frequency illustrates the performance gap in terms of frequency response between the conventional EC and AEC; c Nyquist; and d Bode plots for a schematic impedance model.