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Technical Article
氮化鎵的高di/dt問題
Release date:2023-04-12
Writer:
Category:Technical Article
Views:547次
某些封裝形式會帶來較大的源極漏電感
共源極電感(CSI)是功率回路和驅(qū)動回路共有的電感
高di/dt會在CSI上感應(yīng)出正向或者負向的電壓
在器件開通過程中,這個感應(yīng)出來的電壓部分抵消了門極驅(qū)動電壓,使得開通時間延長
在器件關(guān)斷過程中,這個感應(yīng)出來的電壓又和門極電壓反向,導致關(guān)斷時間拖延,降低效率,并導致振鈴和誤開通
這種負反饋機制帶來較長的電壓-電流交疊時間,增加開關(guān)損耗
氮化鎵器件通常需要一個開爾文腳來分離功率回路和驅(qū)動回路
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氮化鎵功率器件擊穿電壓隨溫度變化
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