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Electronics help! recitifier with a zener diode

  1. Mar 15, 2011 #1
    1. The problem statement, all variables and given/known data
    Design a rectifier with a zener diode that satisfies the following:
    Primary voltage = 120V @ 60Hz
    VDC = 12V
    IR2 = 100 mA (R2 being the load)
    Vr(R2) <= .3V

    2. Relevant equations
    C=IDC/(2fVr)
    IDC=IR3 + IR1


    3. The attempt at a solution
    I tried calculating the capacitor, but how am I supposed to get IDC if I dont have any other current?
     

    Attached Files:

  2. jcsd
  3. Mar 15, 2011 #2

    MATLABdude

    User Avatar
    Science Advisor

    Remember that a reversed Zener diode clamps the voltage, but must be above the zener current ([itex]i_{zk}[/itex]) in order to do so:
    http://www.electronics-tutorials.ws/diode/diode_7.html
     
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