Converter for an electrical machine and method for controlling a power circuit breaker

摘要

The present invention specifies a converter for an electrical machine. A power circuit breaker (T1) comprises at least two semiconductor elements (9, 10) connected to one another to form said power circuit breaker. At least one control circuit (C1, C2, 14) is associated with the at least one power circuit breaker (T1) and is connected to a respective control input of each of the at least two semiconductor components (9, 10) in order to selectively switch the same on and off by means of respective switching signals (S1, S2). The switching signals (S1, S2) are generated on the basis of switching losses and conduction losses of the power circuit breaker (T1).

主权项

1. A converter for an electrical machine, comprising:
at least one power circuit breaker comprising at least two semiconductor components connected to form the power circuit breaker; and at least one control circuit, which is associated with the at least one power circuit breaker and which is connected to a respective control input of the at least two semiconductor components in order to selectively switch the semiconductor components on and off by means of respective switching signals, wherein the switching signals are generated on the basis of switching losses and on the basis of conduction losses of the power circuit breaker, wherein the at least one control circuit comprises storage means in which respective characteristic curves of the switching losses and conduction losses for the power circuit breaker in a partial load range of the electrical machine are stored, wherein the switching signals are generated depending on these characteristic curves, wherein the characteristic curve representing the conduction losses is inversely proportional to the sum of the active chip surface areas of the semiconductor components of the at least one power circuit breaker, and wherein the characteristic curve representing the switching losses is proportional to the sum of the active chip surface areas of the semiconductor components of the at least one power circuit breaker, and the switching signals are generated in such a manner that the overall losses of the power circuit breaker are minimal.