The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 2005
Filed:
Feb. 06, 2003
Jochen Kuehner, Backnang-Heiningen, DE;
Robert Plikat, Eningen, DE;
Klaus Rechberger, Ludwigsburg, DE;
Jochen Ruopp, Neckartailfingen, DE;
Jochen Kuehner, Backnang-Heiningen, DE;
Robert Plikat, Eningen, DE;
Klaus Rechberger, Ludwigsburg, DE;
Jochen Ruopp, Neckartailfingen, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
An inverter for an electric machine is specified that includes a plurality of switching elements, in particular six, which are positioned in a bridge circuit and produce a connection between the electric machine and a battery. The switching elements built into the low-side branch of the inverter are ones that are conductive without a control voltage present, i.e., normally-on switching elements. That ensures that if the supply voltage is absent and the electric machine is rotating the windings of the electric machine are short circuited and no overvoltages are able to occur. In normal operation the inverter is operated like a conventional inverter, by clocked actuation, but with reversed actuation of the control electrodes, i.e., with control voltage for non-conductive time phases and without control voltage in conductive phases.