Patent ID: 6844737

Claim:
A device for detecting an electrical short-circuit comprising: first signal processing means comprising an input for receiving a signal representative of an electrical current, a first output for supplying a first signal representative of the value of such electrical current and a second output for supplying a second signal representative of the differential of such electrical current, and second signal processing means for receiving such a first signal and such a second signal and comprising short-circuit detection means for supplying a short-circuit detection signal when values of such a first signal and such a second signal exceed preset values and thereby define an overshoot point, said second processing means comprising: first monitoring means for monitoring occurrence of an overshoot point, and second monitoring means for determining when such a first signal processing means detects an overshoot point, a value representative of a ratio between variations of values depending on such a first signal and such a second signal when the first processing means detect an overshoot point, and for supplying a short-circuit detection signal when the first monitoring means detect such an overshoot point and when the second monitoring means detect a ratio between variations exceeding a preset threshold value at the time of, or after, the detection of such an overshoot point.