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What is the power factor associated with (typical) DC fast chargers and onboard chargers in electrical vehicles? Also, how much is the harmonic content (especially triple-N harmonics) associated with these chargers? I actually want to understand the neutral sizing for a (purely) EV load and hence it would be helpful if somebody could also shed some light on any other related topic which I should consider for my study.

enter image description here Image Source:http://inpel.ulsan.ac.kr/battery-charger-technologies-for-electric-vehicle/

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  • \$\begingroup\$ So, first question transformer based or switched mode? \$\endgroup\$ – Solar Mike Jun 17 '18 at 12:16
  • \$\begingroup\$ To be honest, I do not know much about the different types of converters and usage in EVs. So can you please give an answer considering my ignorance about the converter type being transformer based or switched-mode... \$\endgroup\$ – Pikachu Jun 17 '18 at 12:51
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    \$\begingroup\$ It totally depends on the charger design, but on any site large enough to matter I would expect there to be a delta-star transformer somewhere in the vicinity of the chargers, in which case triplen just inpacts the K rating of the transformer because it just produces circulating current in the delta winding. Only the commercial three phase chargers are really big enough to be interesting for this and I would expect them to borrow heavily from the motor drives industry when it comes to harmonic suppression (And really everything else). \$\endgroup\$ – Dan Mills Jun 17 '18 at 13:23
  • \$\begingroup\$ Would a 3 phase charger present a blanced load and therefore very little or zero neutral current? Perhaps you should do some research. \$\endgroup\$ – Solar Mike Jun 17 '18 at 13:30
  • \$\begingroup\$ As you show in your diagram there is a Power Factor Correction stage so the PF is nominally 1. The same applies to DC fast chargers not mounted in the vehicle. \$\endgroup\$ – Kevin White Jun 17 '18 at 15:30

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