DRIVE CIRCUIT FOR SEMICONDUCTOR SWITCHING ELEMENT, AND POWER CONVERTER

摘要

PROBLEM TO BE SOLVED: To obtain a drive circuit for a semiconductor switching element that facilitates the execution of desired switching control even if a gate threshold voltage of the semiconductor switching element deviates from a desired value, and a power converter that has no output imbalance between elements by easily and surely synchronizing switching-timing even when there are variations in gate threshold voltage of the parallel-connected semiconductor switching element. SOLUTION: The drive circuit for a semiconductor switching element has in a gate driving circuit 16c a means which detects a voltage between a gate and an emitter during a mirror period when the semiconductor switching element 1 is turned on as the gate threshold voltage, and a means which displaces emitter potential Ve corresponding to a difference between a gate threshold voltage reference value and the detected gate threshold voltage. COPYRIGHT: (C)2008,JPO&INPIT