Siemens is the patentee of the invention entitled "Driver with high output in failure mode", and the patent application date is May 21, 1999. The granted claim 1 is read as: "1. A method of operating a polyphase power supply, each of a plurality of branches of the power supply having a plurality of converter units connected in series, each said branch being connected at a node and a respective Between the lines, there is a line-to-line voltage output between pairs of the above-mentioned branches of this power supply, characterized by: detecting a faulty unit in any of the above-mentioned branches; providing a bypass around each of the above-mentioned faulty units, to form a current path in any of said branches having at least one faulty cell; and to control the cells in said branches of said power supply to maximize said line-to-line voltage output and to keep all line-to-line voltage outputs equal in magnitude ".
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