Systemorientierte Entwurfsmethodik für Fahrzeugladegeräte
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Beschreibung
In this thesis a design methodology for vehicle chargers is developed that enables a holistic analysis of the entire charging system. The grid, the charger and the vehicle battery are considered as a charging system. The design methodology is based on the V-model of a development process. Essential components of the developed design methodology are an uniform, analytical modeling method of the power electronics and a rapid prototyping environment. The modeling method allows to analyze the charger design as well as the charging system in a very short time. The rapid prototyping environment allows rapid, practical validation of the charger’s devices, topologies and operating strategies under real-world conditions. Both components of the design methodology are developed in this work and are used for early property validation in the design process. They would not be available in a conventional design process.
The design methodology is applied to the design of a vehicle charger with a rated power of 3,6 kW and Gallium nitride semiconductor devices. The variety of available topologies is narrowed down to a full active bridge for the power factor correction as well as a CLLC converter and a dual active bridge for the dc-dc converter. Subsequently, these topologies are analyzed and optimized on component and topology level based on the analytical models and by using the rapid prototyping environment for practical investigations. For the power factor correction an efficiency of 98% including the line filter is measured. Among the DC/DC converters, the dual active bridge achieves the highest efficiency of 98,7%. At the system level, operating strategies with variable dc link voltage are considered in particular. All components of the charger are validated under real-world conditions. Based on the results of this work an optimized and independent evaluation model of a vehicle charger can be developed.
Autor*in
Konstantin Siebke
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Aktive Vollbrücke Batterie Betriebsstrategie CLLC converter CLLC-Wandler DC/DC-Wandler Dual Active Bridge (DAB) EMC EMV Eigenschaftenabsicherung Entwurfsmethodik Fahrzeugladegerät Fahrzeugladegerät Filter Fourier transform