Analyse, Design und Aufbau einer resonanten Dual Active Bridge für kompakte Hilfsspannungsversorgungsanwendungen

With the increasing transition of the energy system towards renewable energy sources, the requirements for the electrical power grid are also changing. The volatile nature of renewable energy generation demands a certain degree of flexibility in the grid. In times of low renewable energy input, the missing power must be compensated, for example, by storage systems. To meet these requirements, various power electronic converter stages are employed. Furthermore, the continuous improvement, optimization, and development of power electronic components helps to make the necessary energy conversion as efficient as possible. In addition to the actual power-handling components in converter stages, a variety of electronic devices are required, for instance, to drive power semiconductors, measure physical quantities, or implement control systems. These devices in turn require auxiliary power to enable their operation in the first place. For this purpose, so-called auxiliary power supplies are used, providing the necessary low-voltage levels. A particular type of such converters is the Dual Active Bridge (DAB), a bidirectional DC-DC converter characterized by its high power density and comparatively simple control. This work describes the development process of such a DAB. The aim is the realization of a compact and ecient auxiliary power supply, as it can be used, for example, in Solid State Transformers (SST). An input voltage of up to 1500 V from a DC bus is converted into a low voltage (e.g. 48 V) suitable for electronic components. The DAB is designed to ensure both a high voltage conversion ratio and maximum possible efficiency. In a first step, the DAB is simulated in order to dimension all power semiconductors and passive components. Based on these results, a printed circuit board (PCB) design is created, integrating the additionally required electronic components. Particular emphasis is placed on comparing the conventional DAB with the resonant DAB.