Converter for an electrical machine, controller and method for operating a converter

摘要

A converter for an electrical machine having a plurality of phase lines for connecting the electrical machine. For each phase line the converter has a half-bridge with a first semiconductor switch is configured to electrically connect at least one of the phase lines intermittently to a first supply line of the converter, and a second semiconductor switch configured to electrically connect the phase line intermittently to a second supply line of the converter. The converter is configured for operation in a first energy recovery limiting mode in which at least two of the first semiconductor switches are at least intermittently on simultaneously.

主权项

1. A converter for an electrical machine, the converter comprising:
a plurality of phase lines for connecting the electrical machine and the converter; and a controller having first and second control elements to respectively determine a malfunction in the converter and thereby initiate a first energy recovery limiting mode or a second energy recovery limiting mode when the malfunction is determined, the first control element having a first plausibility checker which is configured to check outputs from the second control element and determine a presence of a malfunction in the converter and to initiate one of the first energy recovery limiting mode and the second energy recovery limiting mode when a malfunction is detected, and the second control element has a second plausibility checker which is configured to check outputs from the first control element and determine a presence of a malfunction in the converter and to initiate one of the first energy recovery limiting mode and the second energy recovery limiting mode when a malfunction is detected; wherein:
each phase line for the converter has a half-bridge with a plurality of first semiconductor switches and a plurality of second semiconductor switches;the first semiconductor switches are to electrically connect at least one of the phase lines intermittently to a first supply line of the converter;the second semiconductor switches are to electrically connect the phase line intermittently to a second supply line of the converter;the converter is configured for operation intermittently in the first energy recovery limiting mode in which at least two of the first semiconductor switches are at least intermittently on simultaneously; andthe converter is configured for operation at least intermittently in the second energy recovery limiting mode in which at least two of the second semiconductor switches are at least intermittently on simultaneously.