Patent · US Expired

Inverter for an electric machine

US6888336B2 · kind B2 · utility

5Cited by

5References

9Claims

0Family size

Assignee

Robert Bosch GmbH · DE

Inventors

Jochen Kuehner · Backnang, DE
Robert Plikat · Eningen unter Achalm, DE
Klaus Rechberger · Ludwigsburg, DE
Jochen Ruopp · Neckartailfingen, DE

Key dates

Filing date	Feb 6, 2003
Grant date	May 3, 2005
Priority date	—
Expiry date	Feb 6, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH02H9/047
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.