Gate drive circuit in power converter with condition detection device

摘要

A gate drive circuit in a power converter includes a voltage-driven switching device, and a gate drive circuit connected to the voltage-driven switching device for driving the same. The gate drive circuit includes a detection device for detecting a physical quantity in the switching device, and an operation device for changing a gate drive condition of the switching device. When an output of the detection means becomes a value outside a specified value at a turn-on or turn-off operation of the switching device, the operation device changes the gate drive condition instantaneously or for a predetermined time to reduce a voltage applied to the switching device.