TIMING ADJUSTMENT METHOD FOR DRIVE CIRCUIT AND TIMING ADJUSTMENT CIRCUIT FOR DRIVE CIRCUIT

摘要

For a drive circuit provided with a rising detection unit (5) for detecting the start of a rise when a voltage-driven semiconductor element (3) is turned off, a timing signal output unit (6) for outputting a speed change timing signal when a predetermined delay time elapses from the time of the start of the rise, and a conduction control unit (4) for a conduction control terminal of the semiconductor element that uses the timing signal, a delay time adjustment method comprises: defining an estimation terminal voltage of the conduction control terminal at the time of an elapse of a rising completion time; if the conduction control terminal does not drop to the estimation terminal voltage or lower before a drive signal is inverted after having been changed to a turn-off level, increasing a delay time by a predetermined unit time so as to change the drive signal to the turn-off level again; and determining the delay time at the time when the voltage of the conduction control terminal has become equal to or lower than the estimation terminal voltage for the first time as a set value.