Electronics help! recitifier with a zener diode


by badaboom
Tags: electronics, rectifier, transformer, zener
badaboom
badaboom is offline
#1
Mar15-11, 07:11 PM
P: 23
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 Thumbnails
circuito.jpg  
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MATLABdude
MATLABdude is offline
#2
Mar15-11, 07:45 PM
Sci Advisor
P: 1,724
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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