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• • • ELECTRIC VEHICLES • • •


ELECTRIC ROADS OF THE FUTURE:EMC CONSIDERATIONS


FOR EV CHARGING POINTS By Holger Urban, head of product management, Schaffner


Vehicle) predicts very strong growth in the coming years. In 2018, the market share of electric cars reached approximately 2.5 per cent, and the number of electric cars built worldwide rose to more than two million units for the first time. By 2030, the number is expected to increase tenfold, up to 60 per cent, which will correspond to twenty million cars sold per year worldwide. It is notable that around 80 per cent of electric vehicle sales today are for purely electric vehicles (BEVs).


N The charging infrastructure currently seems to


be receiving little consideration in the rush to design and develop new electric car models. However, this is at least as important as the cars themselves in order to successfully implement the eMobility rollout in prospect. Approximately 77,000 charging stations are


required for 1 million electric vehicles, including 7,000 DC rapid charging stations (source: Bundesverband Freier Tankstellen -bft). With 20 million cars sold per year, 140,000 DC fast charging stations would have to be installed by 2030. This is a challenge not only from an economic point of view, but also from a technical point of view. Electromagnetic compatibility (EMC) plays a key role in products designed for charging BEV (Battery Electric Vehicles) and HEV (hybrid electric vehicles).


34 ELECTRICAL ENGINEERING • JUNE 2021


ew electric car models are being introduced almost daily. The market forecast for the BEV (Battery Electric


WHAT IS ELECTROMAGNETIC COMPATIBILITY?


Electromagnetic compatibility (EMC) is concerned with the emission and immunity of products connected to the mains supply. The emitted interference or emission generated by lossy switching operations must not exceed specified limits. If noncompliant products are brought onto the market, problems may arise in operation with other consumers connected to the main power grid. Immunity to interference describes the ability of products to withstand external influences without error. The immunity of products can be verified by various tests, for example by means of the surge, burst or flicker test. EMC filters, as developed by Schaffner, are


available to enable compliance with emission limit standards. These filters are designed to operate in the frequency range between 9 kHz and 30 MHz in order to suppress conducted interference. This prevents other devices in the environment from being negatively affected. All standard filters should be designed in accordance with the IEC 60939-3 standard (” Passive filter units for electromagnetic interference suppression “) and other international standards and are therefore readily available for use in a potential customer system. In the case of EV charging stations, electromagnetic compatibility is particularly important, because, without filters any interference


that occurs during rectification in charging stations operated directly from a low-voltage network on the input side could have an effect on the entire network. On the output side, i.e., on the side where the car is charged, the safety of the operator and the interoperability between different charging stations and car manufacturers are of primary importance. Both factors must therefore also be taken into account in the design of the EMC filters.


Figure 1 FILTER SAFETY REQUIREMENTS


The “Norms” on the subject of EMC are completely defined in the area of charging stations. The IEC 61851-23 standard defines the safety-relevant aspects for DC charging stations (fast charging stations). For EMC filters, the definition of the


electricalengineeringmagazine.co.uk


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