CIRCUIT UNIT, CIRCUIT ARRANGEMENT AND METHOD FOR REDUCING SWITCHING LOSSES OF A SEMICONDUCTOR SWITCH
Dossier Overview
Applicant
Robert Bosch GmbH
Inventor
Christoph Henrik van der Broeck; Klaas Strempel; Hauke Van Hoek
IPC Classification
CPC Classification
A circuit unit for reducing switching losses of a semiconductor switch. The circuit unit includes: the semiconductor switch, an auxiliary switch, a capacitor, and a logic unit. A series circuit including the auxiliary switch and the capacitor is connected in parallel with a load path of the semiconductor switch. The logic unit is configured to determine, in a switched-on state of the semiconductor switch, a current intensity of an electric current to be switched using the semiconductor switch and flowing along the load path, close the auxiliary switch or to keep it in a closed state before a switch-off operation of the semiconductor switch when the determined current intensity exceeds a predefined current threshold value, and open the auxiliary switch or to keep it in an open state before a switch-off operation of the semiconductor switch when the determined current intensity does not exceed the predefined current threshold value.
Original (Chinese)
A circuit unit for reducing switching losses of a semiconductor switch. The circuit unit includes: the semiconductor switch, an auxiliary switch, a capacitor, and a logic unit. A series circuit including the auxiliary switch and the capacitor is connected in parallel with a load path of the semiconductor switch. The logic unit is configured to determine, in a switched-on state of the semiconductor switch, a current intensity of an electric current to be switched using the semiconductor switch and flowing along the load path, close the auxiliary switch or to keep it in a closed state before a switch-off operation of the semiconductor switch when the determined current intensity exceeds a predefined current threshold value, and open the auxiliary switch or to keep it in an open state before a switch-off operation of the semiconductor switch when the determined current intensity does not exceed the predefined current threshold value.
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