Gate drive apparatus

摘要

A gate drive apparatus including a constant-current-pulse gate drive circuit (2) which creates a gate signal for a switching device (1) as a constant-current output, a constant-voltage-pulse gate drive circuit (3) which creates the gate signal as a constant-voltage output, and a decision/switch circuit (4) which switches the operation of the constant-current-pulse gate drive circuit (2) and the operation of the constant-voltage-pulse gate drive circuit (3). The variance of switching speeds attributed to the variances of threshold voltages and mirror voltages in a plurality of switching devices which are driven by the gate drive apparatus can be suppressed, and the variance of losses can be minimized.