Diode Circuit Analysis Problems And Solutions Pdf Page

Diode Circuit Analysis — Problems and Solutions (PDF-style short piece)

Problem 1.2 (Reverse Bias)

Same circuit, but diode is reversed.

Solution:

Reverse bias → ideal diode acts as open circuit
I = 0A
V_D = –10V (cathode positive relative to anode)

Problem Type 3: Zener Diode Regulator

Problem: A Zener diode (breakdown voltage (V_Z = 5.1V)) with a series resistor (R_S = 470\Omega) is connected to an unregulated supply (V_in = 12V). The load (R_L = 1k\Omega). Find the load voltage and Zener current. diode circuit analysis problems and solutions pdf

Solution:

First, check if Zener is in breakdown. Remove Zener temporarily: (V_out, open = V_in \times R_L/(R_S + R_L) = 12 \times 1000/1470 \approx 8.16V). This exceeds 5.1V, so Zener breaks down.
Replace Zener with 5.1V voltage source.
Load current (I_L = 5.1 / 1000 = 5.1mA).
Current through (R_S): (I_S = (12 - 5.1)/470 = 6.9 / 470 \approx 14.68mA).
Zener current (I_Z = I_S - I_L = 14.68 - 5.1 = 9.58mA) (positive, so valid).

Key formula for Zener problems: (I_Z = (V_in - V_Z)/R_S - V_Z/R_L). Diode Circuit Analysis — Problems and Solutions (PDF-style

Mastering Diode Circuit Analysis: A Comprehensive Guide to Problems and Solutions (PDF Included)