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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