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K. Edelmoser, H. Ertl, F. Zach:
"A Novel High-Input Voltage Switch-Mode Power-Supply Concept";
WSEAS Transactions on Power Systems, 6 (2006), 1; S. 1062 - 1068.

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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