6GK7343-1GX31-0XE0 一開始隨著柵極電荷的增加而增加;但是當Vgs增加到米勒平臺電壓大小Vp時;即使柵極電荷繼續增加;Vgs也保持不變;因為增加的柵極電荷被用來給Cgd電容進行充電。
因此;MOS管會有對應的Qgs;Qgd和Qg電荷參數;如圖6所示。
在MOS管截止時;漏極電壓對Cgd充電;Cgd的電壓極性是上正下負;當MOS管進入米勒平臺后;大部分的柵極電荷用來對Cgd進行充電;但是極性與漏極充電相反;即下正上負;因此也可理解為對Cgd反向放電;最終使得Vgd電壓由負變正;結束米勒平臺進入可變電阻區。
米勒平臺時間內;Vds開始下降;米勒平臺的持續時間即為Vds電壓從值下降到最小值的時間。
由此可見米勒平臺時間與電容Cgd大小成正比;在通信設備行業中-48V電源的緩啟動電路經常在MOS管柵漏極間并聯一個較大的電容;以延長米勒平臺時間來達到電壓緩啟動的目的。
MOS管損耗主要有開關損耗（開通損耗和關斷損耗;關注參數Cgd(Crss)）、柵極驅動損耗（關注參數Qg）和導通損耗(關注參數Rds(on))等。
以如圖10所示的同步BUCK拓撲為例進行說明;由于高側的開關管Q1和低側的同步管Q2組成一個半橋結構;為了防止兩個MOS管同時導通而使輸入回路短路;因此兩個MOS管的驅動信號會存在一個死區時間;即兩個MOS管都關斷。
在死區時間內;由于電感的電流不能突變;因此同步管Q2的寄生體二極管將率先導通進行續流。
正是由于體二極管導通后;同步管Q2才被驅動導通;在忽略二極管壓降的情況下;同步管Q2導通時兩端電壓為0;可以看作是0電壓導通;同步管Q2導通后;其兩端電壓為0直至關斷;因此也是0電壓關斷。
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GE Fanuc A06B-6114-K505 A06B6114K505特價銷售，優價供應.
GE FANUC A06B6058H321特價銷售，優價供應.
Fanuc A06B-0142-B088特價銷售，優價供應.
FANUC A06B-0314-B042-R A06B0314B042R特價銷售，優價供應.
Fanuc A06B-6059-H212 #H535特價銷售，優價供應.
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