Patent ID: 6445557
Filing Date: 2002-09-03
Classification: H02H,H03K

Abstract:
A method for performing a short-circuit and overload disconnection with a semiconductor component, the method which comprises:providing a semiconductor component having a drain, a source and a gate, the semiconductor component having a gate-source voltage UGS applied thereto, having a current IJFET flowing therethrough, and having a voltage UJFET dropping across the semiconductor component; adjusting, in an operating situation, the gate-source voltage UGS at the semiconductor component, in dependence on the current IJFET, such that, after charge carriers in the semiconductor component are depleted, the voltage UJFET assuming the highest possible value still uncritical for the semiconductor component and for a circuit to be disconnected; and using, for the step of adjusting the gate-source voltage UGS, an algorithm in the form of UGS=Uon&af;[1-IJFET&it;(t)GJFET&it;(UJFET)]where Uon denotes a switching voltage, IJFET(t) denotes the current IJFET in dependence on a time t, and GJFET denotes a function dependent only on the voltage UJFET dropping across the semiconductor component.