Control unit for short circuit detection

Abstract

The present invention relates to a control unit (1) for detecting a short circuit during the turn-on process of a MOSFET (2) in a circuit comprising: a storage unit (3), a measuring sensor (4), and a processing unit (5), wherein the storage unit (3) is configured to provide the processing unit (5) with predefined signal values ​​for performing comparisons, wherein the measuring sensor (4) is configured to detect at least one signal from the MOSFET (2) and transmit the signal to the processing unit (5), wherein the processing unit (5) is configured to perform a first comparison in which a turn-off signal is emitted if the signal exceeds a first predefined value, and / or to perform a second comparison in which the turn-off signal is emitted if a signal change time of the signal determined by the processing unit (5) exceeds a second predefined value, and / or to perform a third comparison.wherein a gate voltage and a gate current are detected as signals, and wherein in the third comparison a capacitance is determined based on a phase shift and / or an attenuation between the gate voltage and the corresponding gate current, and the shutdown signal is emitted when the capacitance exceeds a third predefined value.

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