• • • ELECTRIC VEHICLES • • • EMC limit values for
EV charging stations A part of the IEC61851-21-2 standard defines the limit values and the corresponding measurement setups. It is important to ensure that the correct network simulations and limits are used. On the input side (main power grid side) it must
also be defined in which environment the charging point will be used, i.e., whether it is an industrial (Class A) or residential environment (Class B). The conductive power transfer port (CPT) must
be terminated according to CISPR 25:2008 and the AC/DC input port terminated according to CISPR 16-1-2:2014. The limit lines for the AC/DC input port follow the specifications of IEC 61000-6-3, for the CPT port the limit values shown in the following diagram for conducted emission (between 150 kHz and 30 MHz) apply.
production capacity. At this time, cost factors also play an important role. At the time of consolidation an application-specific solution must be available so customers can continue to be satisfactorily served in the future. This application- specific solution must also be optimized in terms of cost and size. FN2220 and FN2230 will be application specific filters designed for EV charging purposes.
Galvanic isolation in
EV charging stations To ensure the safe operation of EV charging stations, a galvanic separation between the input and output side is required in addition to compliance with EMC requirements and standards. The use of medium-frequency transformers is particularly beneficial for DC fast
research project in operation with RWTH Aachen University, even a 5,000 kVA medium-frequency transformer for coupling DC networks was successfully delivered and tested.
Customer-specific developments Since not only the functionality but also the
design of the charging stations is important, the size of the filters is often also decisive. Furthermore, the cost factor is playing an increasingly important role. The life cycle of products is similar to that of the
start of photovoltaic industry, all manufacturers initially grow very fast and have few resources available to deal with the EMC filter topic. This often results in oversized filters. The first major wave of industrialisation is
typically followed by a consolidation of manufacturers, and thus also by an increase in
charging stations, where inverter technology is anyway required for rectifying the AC mains voltage. Compared to conventional main grid
transformers, they can be designed much more compact with the same performance. This means that they can also be placed in constricted charging stations. Schaffner offers a broad portfolio that can meet almost all customer needs. Depending on requirements cooling can be
natural or forced convection or even water cooling can be applied. Power in the two to three-digit kVA range can be generated. Within the framework of a
in the field of EV charging Based on many years of experience with charging technology, Schaffner is able to provide complex customer specific solutions. In charging stations, for example, high power consumption via the capacitors can occur during no-load operation. With the help of additional logic switches, this
problem can be completely eliminated and entirely integrated into the filter. The Schaffner Group works hard to offer its customers the perfect solution – at every stage of industrialization and with maximum delivery reliability. Our company blog, Schaffner Impulse, provides
many interesting articles on the subject of EMC in e-mobility. For example, by developing compact, current compensated chokes, Schaffner has succeeded in reducing interference signals in the car between 80 and 400 amperes with only one magnetic core.
Cluster Electric Mobility South-West
Schaffner is a member of the Cluster Electric Mobility South-West in the State of Baden-Württemberg/Germany. It is one of the most important regional associations in the field of electric mobility. It brings together relevant players in the field of E-Mobility to research and work together on future-oriented approaches for vehicles,
charging systems and forms of mobility. As an international leader in electromagnetic compatibility, Schaffner is now contributing to the electromobility technology field in the e-mobility innovation cluster of the State of Baden-Württemberg. With the help of Schaffner’s experience in EMC filter design, smooth and efficient operation of the charging station infrastructure can
be made possible. In close cooperation with the other companies in the cluster, optimal solutions are thus created in a targeted manner. Electromobility is considered one of the main drivers in current global megatrends –electrification, urbanisation, digitalisation, climatic change. For this reason, we see it as our task to provide cutting-edge technology.
28 ELECTRICAL ENGINEERING • JUNE 2022
electricalengineeringmagazine.co.uk
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