FBM22 P0900HS     4－20mA 自動/手動站輸入 1 輸入/1 輸出

FBM22 P0900HS     4－20mA 自動/手動站輸入 1 輸入/1 輸出

FBM22 P0900HS     4－20mA 自動/手動站輸入 1 輸入/1 輸出

FBM22 P0900HS

開關(guān)電源的工作過程相當(dāng)容易理解，

在線性電源中，

讓功率晶體管工作在線性模式，

與線性電源不同的是，

PWM開關(guān)電源是讓功率晶體管工作在導(dǎo)通和關(guān)斷的狀態(tài)，在這兩種狀態(tài)中，

加在功率晶體管上的伏-安乘積是很小的（

在導(dǎo)通時，電壓低，電流大；關(guān)斷時，電壓高，

電流小）/功率器件上的伏安乘積就是功率半導(dǎo)體器件上所產(chǎn)生的損耗。

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