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Ming Kai asked in 科學其他:科學 · 1 decade ago

齊納二極體與電感組成的電路

題目如下:

圖片為一個電感儲能與釋放能量而不會損毀電晶體電路

Vcc=12v...........L=50mH

齊納崩潰電壓Vz=20v

電晶體開關週期性on.off,ton=20ms,toff=50ms

求(A)說明齊納二極體何以開關打開

(B)求出一週期性的電感電流iL(t)和齊納二極體電流iz(t)

(C)描繪電感與齊納二極體的p(t)

(D)求電感與齊納二極體所吸收的平均功率

圖片放於:

1 Answer

Rating
  • 1111
    Lv 7
    1 decade ago
    Favorite Answer

    Ton

    VL=Ldi/dt

    di/dt=12/50m=240

    at t=20ms i=240*20ms=4.8A

    Toff, zener break down

    12=Ldi/dt+20V

    di/dt=(12-20)/50m = -160

    zener current = 4.8-160*t=0

    t=4.8/160=30ms

    2008-04-21 17:56:52 補充:

    Pl (av)=0;

    Pzd=(96*30/2/70=20.6w

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