Patent ID: 9673807
Date: 2017-06-06
CPC Classifications: H03K

Claim:
1. A gate voltage control apparatus configured to control a gate voltage of a switching device, wherein, when turning off the switching device, the gate voltage control apparatus performs: a first process of decreasing the gate voltage to a value equal to or lower than a threshold voltage so as to increase a voltage between main terminals of the switching device from an on-voltage; a second process of controlling the gate voltage to become a value higher than the threshold voltage after the time at which the voltage between the main terminals becomes a peak value during the first process; and a third process of decreasing the gate voltage to a value equal to or lower than the threshold voltage while the voltage between the main terminals remains at a value lower than the peak value and higher than the on-voltage during the second process, and wherein a rate of change of the voltage between the main terminals with respect to time just after the end of the second process is lower than a rate of change of the voltage between the main terminals with respect to a time just before the start of the second process.