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Technical Article
氮化镓的高di/dt问题
Release date:2023-04-12
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Category:Technical Article
Views:546次
某些封装形式会带来较大的源极漏电感
共源极电感(CSI)是功率回路和驱动回路共有的电感
高di/dt会在CSI上感应出正向或者负向的电压
在器件开通过程中,这个感应出来的电压部分抵消了门极驱动电压,使得开通时间延长
在器件关断过程中,这个感应出来的电压又和门极电压反向,导致关断时间拖延,降低效率,并导致振铃和误开通
这种负反馈机制带来较长的电压-电流交叠时间,增加开关损耗
氮化镓器件通常需要一个开尔文脚来分离功率回路和驱动回路
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氮化镓功率器件击穿电压随温度变化
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