Dioides and Their Applications by nikeborome

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```									Chapter 6
Diodes and Their Applications

1
Objectives

Describe how the properties of a
semiconductor differ from those of a
conductor and an insulator.
Define donors and acceptors and discuss
their functions in creating P-type material
and N-type material.
Discuss the basic properties of a PN-
junction diode and sketch the form of the
terminal characteristic curve.
2
Objectives
Describe the ideal model and the constant
voltage model for a junction diode and
draw the equivalent circuit forms.
Analyze simple circuit forms containing
diodes and determine when a diode is
forward biased or reverse biased.
State the input-output properties of an
ideal transformer in terms of the turns
ratio.
3
Objectives
Draw the schematic diagram of a half-
wave rectifier and analyze its operation.
Draw the schematic diagram of a full-wave
rectifier with a center-tapped secondary
and analyze its operation.
Draw the schematic diagram of a full-wave
bridge rectifier and analyze its operation.
Describe the function of a rectifier filter
and analyze the ripple level.
4
Objectives

Define peak inverse voltage and
determine its value for different rectifier
circuits.
Discuss the properties of different types of
diodes.
Draw the schematic diagram of a zener
regulator circuit and analyze its operation.

5
6-1 Semiconductor Concepts

Conductors, Insulators, and
Semiconductors
Electrons or Holes
Doping and Impurities (Donors or
Acceptors)
P-type and N-type Material

6
6-2 Junction Diode

Schematic Symbol
Applications
Terminal Characteristic

7
PN-junction diode and its schematic
symbol.

8
Ideal resistance and its terminal
characteristic.

9
Experiment used to determine
semiconductor diode terminal
characteristic.

10
Form of the terminal characteristic of a
semiconductor diode.

11
6-3 Diode Circuit Models

Ideal Diode Model
Constant Voltage Model
Other Models
Which Model is Appropriate?
Is a Diode Forward Biased or Reverse
Biased?

12
Ideal diode model and terminal
characteristic.

13
Constant voltage diode model and
terminal characteristic.

14
Circuit of Example 6-1.

15
Circuit of Example 6-2.

16
6-4 Diode Rectifier Circuits

Why Convert AC to DC?
Half-Wave Rectifier Circuit (Unfiltered)
Full-Wave Rectifier Circuit (Unfiltered)
Full-Wave Rectifier Bridge

17
A half-wave rectifier without filtering and
the waveforms.

18
Schematic diagram of an unfiltered full-
wave rectifier with a center-tapped
transformer and the waveforms.

19
Conduction models for full-wave rectifier
with center tap for alternate half-cycles.

20
Schematic diagram of an unfiltered full-
wave bridge rectifier circuit.

21
Conduction models for bridge rectifier for
alternate half-cycles.

22
6-5 Rectifier Circuits with Filtering

Half-Wave Rectifier with Capacitor Filter
Full-Wave Rectifiers with Capacitor Filter
Ripple Analysis
Reverse Diode Voltage
More Complex Filter Circuits
Power Supplies with a Voltage Regulator

23
Schematic diagram of a basic half-wave
rectifier circuit with transformer and
capacitor filter.

24
Waveforms for half-wave rectifier with
transformer and filter.

25
Schematic diagram of a full-wave rectifier
circuit with transformer and capacitor
filter.

26
Schematic diagram of a full-wave bridge
rectifier circuit with capacitor filter.

27
Waveforms for full-wave rectifier without
and with filter.

28
Schematic diagram of a rectifier circuit
with voltage regulator.

29
6-6 Survey of Other Diode Types

Zener Diode
Light Emitting Diode
Photodiode
Optocoupler
Schottky Diode
Varactor Diodes

30
Schematic symbols for various types of
diodes.

31
6-7 Zener Regulator Circuits

Qualitative Explanation

32
Typical zener regulator circuit.

33
Circuit of Example 6-8 with voltage and
current values labeled.

34
Circuit of Example 6-9 with voltage and
current values labeled.

35
Circuit of Example 6-10 with voltage and
current values labeled.

36

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