Isolated gate driver and power device driver system including the same

摘要

In accordance with the present invention, there is provided an insulated gate driver comprising: a low voltage part including a PWM transmission unit for receiving a PWM signal from a microcontroller unit and outputting a PWM low voltage signal and a low voltage logic block for receiving a control signal from the microcontroller unit; for outputting a low voltage control signal; an isolation part for amplifying the PWM low voltage signal and the low voltage control signal to a PWM high voltage signal and a high voltage control signal, respectively; and a high voltage part insulated by the insulating part from the low voltage part, the high voltage part comprising: a high voltage logic block for outputting a change speed control signal corresponding to the high voltage control signal; a rate of change control for controlling a rate of change of a gate voltage of a power device outside the isolated gate driver such that the gate voltage of the power device has the rate of change in response to the rate of change control signal at a rising edge or a falling edge; and a rate of change feedback unit including a rate of change measuring unit for measuring the rate of change of the gate voltage and for allowing the rate of change control to change the rate of change of the gate voltage.