A06B-6081-H106

A06B-6081-H106

A06B-6081-H106主要差别在于前者中IGBT发生短路故障时，导致A点电平升高，达到反向器40106的翻转电平时使F点为低，输出故障信号。这里40106的翻转电平对应的电压有个范围，而且不同厂商的产品可能会有所不同，这会导致过流点不准确，所以后者利用一只稳压管BZX84C7V5将A点的故障电位点限定在7.5V，当IGBT发生短路故障时，导致A点电平升高超过7.5V，稳压管导通，三极管Q3开通，C点为低电平，FO输出为低，从而产生故障信号。

此外上图中还增加了驱动电源欠压保护电路，当驱动电源VCC_U低于12V时，三极管Q2截止，D点、B点为高电平，使三极管Q3开通，产生故障信号。当驱动电源VCC_U正常为15V时，D点为低电平，对B点无影响。二极管D3的作用是单向导通，D点为低电平时，使保护电路对欠压电路部分无影响。

典型的IGBT驱动电路如下图。对于IGBT的驱动，由于IGBT的特性随VGE和RG变化，而且随IGBT的电流不同驱动功率有所变化，因此驱动电路的结构也有所不同。

A06B-6081-H106 

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