基于氮化镓功率器件的过流保护电路研究

Research on Over-current Protection Circuit Based on GaN Power Device

提出了一种适用于高频场合下氮化镓GaN(gallium nitride)功率器件的过流保护电路。该保护电路在高达几百千赫甚至兆赫的开关频率下,通过检测氮化镓功率器件的漏-源电压实现对过流故障的识别,在故障下可迅速关断GaN器件进行保护。仿真和实验结果证明,该过流保护电路具有响应迅速、结构简单和抗干扰性强的优点,可有效提高氮化镓器件应用的可靠性。

A gallium nitride(GaN)based over-current protection circuit is proposed,which is suitable for high-frequency application scenarios.This circuit can identify the over-current fault by detecting the drain-source voltage of a GaN power device at a switching frequency of up to several hundred kHz or even 1 MHz,and it can quickly turn off the GaN device for protection under fault.Simulation and experimental results show that the proposed over-current protection circuit has advantages of fast response,simple structure and strong anti-interference,thereby effectively improving the reliability of the applications of GaN devices.