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Posted by Holger Urban

What's driving EMC in EV-Charging: It's not just plugging a connector in to your car

With the increasing demand of EV charging installations the International Electrotechnical Commission IEC is defining global standards which involve among other important aspects also EMC  regulations and safety considerations. This shall not only ensure a proper system interoperability  but also consider conducted EMC emission levels on both sides of the charging stations.


EV Charging Technical Bulletin_9_17 V2.jpg
Picture 1: Candidates for Design-In


From charging station to EV (CPT port):

IEC61851-1Electric vehicle conductive charging system
  • Part 1: General requirements and:
    • Emission Testing according to IEC61000-6-3
    • Immunity testing according to IEC61000-6-1
  • Part 21-1: EMC requirements for On-board charger connected to an AC/DC supply
  • Part 21-2: EMC requirements for Off-board AC/DC charging system
  • Part 23: DC charging station
  • Part 24: Communication between DC charging station and EV


From charging station to grid / power source:

IEC61000-6-2 & -3: EMC immunity and emission
IEC 6100-3-12: Electromagnetic compatibility (EMC) - Limits for harmonic currents


EV Charging Technical Bulletin_9_17 V2_chart.jpgPicture 2: DC Charger - possible filter positioning


The IEC61851 standard is taking into account all types of Off-board charging equipment, which can  be used and installed in different locations. This standard covers all residential-, commercial-, light industrial- (acc. IEC61000-6-1 and -3) and industrial environments (acc. IEC61000-6-2 and -4), irrespective of whether the equipment is located in- or outdoor. In case the environment is not defined, the lowest emission limits and the highest immunity test levels shall be applied.

Schaffner standard AC or DC filter (DC up to 1 S00VDC), custom based filter designs or common mode choke components for embedded filtering can meet your required targets:

  • EMC performance levels for any environment
  • Safety aspects (like variable Cy capacitor for DC charging systems acc. to IEC61851-23)


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