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K. Edelmoser, F. Zach:
"A Multi-Cell Switch-Mode Power-Supply Concept Featuring Inherent Input Voltage Balancing";
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., 6 S.

A novel switch-mode power supply (SMPS) concept is presented which is especially
suited to high input voltages. The topology is based on a multi-cell arrangement where individual
DC-DC converter cells are connected in series regarding their input side whereas the isolated
output stages of the cells are connected in parallel. The identical cells are realized as
self-oscillating series-resonant converters operated at near unity duty cycle. Consequently,
the cell only performs an isolation function, the voltage regulation is realized by a subsequent
non-isolated DC-DC converter at low voltage level. The isolation stage is based on the well known
half-bridge topology utilizing efficient standard medium-voltage MOSFETs. A very interesting
feature of the proposed system is that it is characterized by an inherent equalizing of the
input voltage of the individual cells without any control requirements. The paper gives a short
introduction to the basic problems of SMPS for high input voltages, describes the basic operation
of the presented topology and gives a dimensioning as well as simulation results and presents
measurement results taken from a laboratory prototype.

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