Patent ID: 9366717
Filing Date: 2016-06-14
CPC Classification: G01R,H03K

Claim Text:
1. A device for the detection of a change in the voltage across a power semiconductor switch, the device comprising: a resistive-capacitive network having a first, a second, a third and a fourth node, wherein the resistive-capacitive network is to be coupled to a first terminal of the power semiconductor switch at the first node and to provide at the second node a signal that is representative of a voltage across the power semiconductor switch, wherein the resistive-capacitive network includes: a timer circuit coupled to the third node of the resistive-capacitive network and configured to generate a detection signal that is representative of the change in the voltage across the power semiconductor switch after switching on of the power semiconductor switch, wherein the timer circuit is configured to raise a level of the detection signal above a predetermined threshold voltage if the voltage across the power semiconductor switch does not fall below a predetermined value after switching on of the power semiconductor switch, and wherein the resistive-capacitive network is configured such that parasitic capacitances of the device are compensated or over compensated so as to prevent the timer circuit from raising the level of the detection signal above the predetermined threshold voltage if the voltage across the power semiconductor switch does fall below the predetermined value after switching on of the power semiconductor switch.