Patent ID: 6529061
Filing Date: 2003-03-04
Classification: H03K

Abstract:
A semiconductor device for driving a power semiconductor comprising:a level-shift circuit having a resistance member and a switching device; said resistance member comprising a switching-on level-shift resistor which is divided into two first resistors; and a switching-off level-shift resistor which is divided into two second resistors; a votage detector which detects potentials of the resistance member as signals; a logic filter set which logically excludes an error signal due to dv/dt from the signals detected by the votage detector; and a drive part which drives the power semiconductor based on the output of said logic filter set; wherein said voltage detector detects potentials of both ends of one of the first resistors as signals Aon and Bon, and detects potentials of both ends of one of the second resistors as signals Aoff and Boff, wherein when an output period of the signals Bon and Boff is longer than that of the signals Aon and Aoff, the logic filter set does not output an abnormal signal.