Patent ID: 6337799
Filing Date: 2002-01-08
Classification: H03K

Abstract:
An apparatus for controlling voltage-charge controlled power semiconductor devices in equipments for converting electric power, which comprises members adapted to detect function parameters of a said power semiconductor device and an arrangement adapted to control the voltage between the gate and the emitter of the power semiconductor device depending upon the value of the function parameters detected so as to by that control the power semiconductor device wherein said members are adapted to detect selected parameters describing the function of the power semiconductor device through connections to the power semiconductor device, and that the apparatus also comprises means adapted to compare the value of the selected function parameters detected with reference levels thereof, a programmable circuit adapted to generate said reference levels for comparison and process data resulting from the comparison so as to based thereon on its output deliver a digital signal corresponding to an order of a predetermined current level to or from the gate of the power semiconductor device, and a digitally controlled amplifier being current stiff, i.e., provided with current sources operating in constant current mode, adapted to receive the digital signal from the programmable circuit and on basis thereof through said current sources generate a current to or from the gate of the power semiconductor device with said predetermined current level for controlling the power semiconductor device.