Patent ID: 6831328
Filing Date: 2004-12-14
Classification: H01L

Abstract:
A control circuit for controlling turning-off of a vertical power component selected from the group comprising the so-called thyristor, MOS, IGBT, PMCT, EST, BRT transistor, MOS thyristor, gate turn-off MOS thyristor, formed in a tightly-doped N-type substrate (1) and having its rear surface (2), coated with a first metallization, which corresponds to an anode of the vertical power component, said circuit comprising:a voltage sensor comprising, on the front surface side, an area (12) of the substrate surrounded at least partially with a p-type region (11) at a low voltage as compared to an anode voltage, said area (12) being coated with a second metallization (M) in ohmic contact therewith, on which is provided an image of the anode voltage, an output voltage of said sensor being applied to a control terminal of a switch (34) connected between a cathode and a gate terminal of said vertical power component that can be turned off when this gate terminal is connected to the cathode, a delay circuit (35) being interposed between the sensor output voltage and said gate terminal.