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K. Edelmoser, F. Zach:
"Bi-Directional DC-to-DC Converter With Extended Voltage Transfer Ratio";
Vortrag: WSEAS International Conference on Circuits,Systems,Communications and Computers CSCC, Athen, Greece; 10.07.2006 - 15.07.2006; in: "Proceedings of the 10th WSEAS International Conference of Circuits, Systems, Communications and Computers CSCC'06", (2006), ISBN: 960-8457-47-5; Paper-Nr. 534-373.pdf, 4 S.

Conventional inverters used in local plant and power grid connected applications show the
disadvantage of coupling the bypass-battery and the solar cells, operating at low DC-voltages, to
the inverters' DC-link. These converters with rather low input and high output voltage ratings,
respectively, have, due to the required transfer power, high current ratings, leading to relatively
low efficiency. Therefore, only a special design can help here to adapt the different voltage
levels in an acceptable way. Also, a second energy direction required for battery charging is
necessary in most cases and can therefore be implemented principally into the concept. In this
paper, a possible solution for such a specific solar converter is presented: a bi-directional
DC-to-DC converter, well-suited for DC-link and charging operation. The input voltage of a
(e.g. a solar buffered) battery (12V or 24V) is adapted to a 360V DC-link, operating in both
energy directions, for a local grid power inverter supply. The total power to be handled at the
output of the DC-to-DC converter is 400W (12V) or 800W (24V), respectively, at uplink and 200W
for battery charging. The structure presented in this paper shows remarkable improvements of these
topics.

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