Multiport Converter in the Application Field of Fast Charging Stations

The concept of multiport converter as a building block for the DC/DC stage enables a fast charging station with multiple charging spots. The magnetic coupling of the output ports allows to reduce the required number of components in the DC/DC stage. However, the magnetic coupling between the output ports and the resulting mutual influence on the output characteristics, referred to as cross-coupling effects, impacts the converter’s performance. Particularly when confronted with substantial load variations among the output ports, the cross-coupling effects can deteriorate the efficiency of the multiport converter. The root cause for the cross-coupling effects is derived and it is shown that choosing an appropriate inductance ratio between the output ports and the input port is an effective way to reduce the cross-coupling effects. By reducing cross-coupling effects the full potential of multiport
converters as a building block in fast charging stations can be exploited. Different strategies in transformer design process are illustrated to achieve the necessary inductance ratio.

Apart from the usage as a building block for providing charging spots, the multiport converter can be used to integrate battery storage in fast charging stations. For an efficient integration of the battery storage, the concept of a multiport converter based on partial power processing is proposed. Compared to conventional full power processing converters, with partial power processing only a part of the power is transferred through the converter. This increases the efficiency of the converter and at the same time leads to a cost reduction. The special requirements for the design of partial power processing based
multiport converters are evaluated.

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Zitierform:
Hoffmann, F., 2025. Multiport Converter in the Application Field of Fast Charging Stations.
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