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Dioides and Their Applications

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  • pg 1
									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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