[Zurück]

K. Edelmoser, F. Himmelstoß:
"Bidirectional DC-to-DC Converter in Solar Battery Applications";
Vortrag: International Conference on Power and Energy Systems IASTED, Rhodes, Greece; 03.07.2001 - 06.07.2001; in: "Proceedings", ACTA Press, Sixth IASTED (2001), ISBN: 0-88986-291-5; S. 580 - 584.

DC-to-DC converters with very low input respectively high output voltage ratings have, due to the high current ratings, a relatively low efficiency. Therefore, a special design is required to adapt the different voltage levels. It also makes sense to operate several converter stages in parallel to achieve an acceptable total efficiency. In this paper a possible solution for such a converter is presented. The voltage of a (e.g. a solar buffered) battery (12V or 24V) has to be converted into a DC-link voltage of 400V, e.g. for mains-coupled power inverter supply. In our case the total power to be managed is 1kW. Using a single stage converter, this leads to about 100A input current (causing peak values in the power switches of up to 200A!). The resulting component stress is very hard and also the design is difficult to handle. To overcome these problems a topology was chosen which uses several converter stages operating in parallel. The stages are shared by a phase delay to minimize input current ripple. Figure 13 depicts the realization principle of the presented solution.