This document discusses various applications of diodes including load line analysis, half wave and full wave rectification, clipping, clamping, and Zener diodes. It provides examples of how to analyze diode circuits including series, parallel and bridge configurations. Practical applications of diodes discussed include inductor bypassing, battery backup protection, polarity detection, and voltage regulation. Circuit diagrams and equations are presented to analyze diode characteristics and behavior in different circuit configurations.
2. 2.0 Diode Applications 2 of 31
Drawing the load line and finding the point of operation.
Drawing the load line.
1) Redraw the circuit with the diode on the right.
2) Remove the diode and find a couple of points on the curve of VD vs. ID.
Convenient points are, the current when VD = 0 and the voltage when ID = 0.
Draw the line connecting these two points and note the voltage on the horizontal axis.
Note the intersection point.
VD VR
4. 2.0 Diode Applications 4 of 31
2.3 Diode Approximations
Series Diode Configurations with DC Inputs
(a) Circuit; (b) characteristics
Silicon 0.7
Germanium 0.3
Series Diode Configurations.
Circuit for Example 2.11.
5. 2.0 Diode Applications 5 of 31
2.5 Parallel and Series-Parallel Configuations
Two diodes sharing the load current.
12. 2.0 Diode Applications 12 of 31
Conduction path for the positive region of vi.
Conduction path for the negative region of vi.
Input and output waveforms for a full-wave rectifier.
Vavg ≈ 0.636Vm Vavg ≈ 0.636(Vm - VT )
13. 2.0 Diode Applications 13 of 31
Center-tapped transformer full-wave rectifier.
Network conditions for the positive region of vi.
27. 2.0 Diode Applications 27 of 31
The output voltage across the Zener is Vz.
The minimum value of R Lmin is given by the equation,
RLmin
Vz Vi.
R RLmin
R
RLmin Vz.
Vi Vz
Now to find the maximum value of RL. As the value of RL is
increased the current through the Zener is increased.
Izm IR IRLmin
Vz
IRLmin
RLmax
Vz
Izm IR
RLmax
Vz
RLmax
IR Izm
Vz
RLmax
Vi Vz
Izm
R
28. 2.0 Diode Applications 28 of 31
2.12 Voltage-Multiplier Circuits
Voltage Doubler
Half-wave doubler