Transcript Lecture Slides

Zener Diode Circuits for Power
Supply Designs
Section 4.4
In this lecture, we will:
Apply the characteristics of the Zener
diode to a Zener diode voltage
regulator circuit.
Block Diagram
for an AC to DC Converter
(Power Supply)
Voltage Regulator
VZ
IL 
RL
VPS  VZ
II 
Ri
IZ  II  IL
The characteristics of the Zener diode
determines VL.
Example Problem I
Example Problem I
Example Problem I
Example Problem II
Example Problem II
Example Problem II
Example Problem II
Load Line Analysis
The reverse bias I-V is important for Zener diodes.
Voltage Rectifier with nonzero
Zener resistance
The Zener diode begins to conduct when VPS = VZ.
When VPS ≥ VZ:
VL = VZ
IL = VZ/RL,, but VZ ≠ constant
I1 = (VPS – VZ)/Ri
IZ = I 1 - IL
Example Problem III
Example Problem III
Example Problem III
Example Problem III
Example Problem III
Example Problem III
Example Problem IV
Example Problem IV
Example Problem IV
Example Problem IV
Example Problem IV