IGBT Drive Optocoupler with Desaturation Detection and Active Miller Clamp

In this paper, an IGBT drive optocoupler with desaturation detection and active miller clamp is proposed. It consists of an IGBT driver, which features low R DS(ON) CMOS transistors, to drive the IGBT from rail to rail, and integrated desaturation detection and isolated fault sense to detect the V CE of IGBT and turn off the IGBT in time when it exits the saturation zone. Besides, active miller clamp (AMC) function is able to switch off the IGBT during high dv/dt situation. This Driver is designed in 0.18μm BCD technology. Simulation results show that the DESAT threshold V DESAT is 6.5V. Clamping threshold voltage V CLAMP is 2.2V, clamp low level sinking current I CLAMPL is 1.1A.