بسم هللا الرحمن الرحيم The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department POWER ELECTRONICS EELE 5450 — Fall 2009-2010 Instructor: Eng.Moayed N.
Download ReportTranscript بسم هللا الرحمن الرحيم The Islamic University of Gaza Faculty of Engineering Electrical Engineering Department POWER ELECTRONICS EELE 5450 — Fall 2009-2010 Instructor: Eng.Moayed N.
Slide 1
بسم هللا الرحمن الرحيم
The Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
POWER ELECTRONICS
EELE 5450 — Fall 2009-2010
Instructor: Eng.Moayed N. EL Mobaied
Lecture 16
Slide 2
Chapter six
DC Choppers and DC motor Control
Various methods are available for obtaining a variable dc
voltage from a constant dc source.
There is a demand for changing from one dc voltage to another.
Some of the more important practical applications include
power converters or armature voltage control of dc motors,
converting low or high battery source voltage to levels which
best match practical load requirements, and controlling dc
power for a wide variety of industrial processes.
Slide 3
Chapter six
DC Choppers and DC motor Control
The thyristor converter offers greater efficiently, faster
response, lower maintenance, smaller size, and for many
applications, lower cost than motor-generator sets or gas tube
approaches.
In thyristor-type dc-to-dc converters, commutating circuits are
required similar to those used in many inverters.
Slide 4
Chapter six
SCR Voltage Choppers
Control of a dc motor’s speed by an SCR voltage chopper is
required where the supply is dc (as from a battery) or the ac
voltage has already been rectified to a dc voltage.
Slide 5
Chapter six
SCR Voltage Choppers
Vout could be varied by the following methods:
1. Ton may be varied while T is held constant (PWM).
2. Ton may be kept constant while T is varied (freq. modulation).
3. Combined pulse-width and frequency modulation.
Slide 6
Chapter six
A Free-Wheeling Diode DC Motor Drive Using the Jones Chopper
This circuit is frequently referred to as a chopper circuit.
Slide 7
Chapter six
A Free-Wheeling Diode DC Motor Drive Using the Jones Chopper
End of Lecture **** Eng.moayed
بسم هللا الرحمن الرحيم
The Islamic University of Gaza
Faculty of Engineering
Electrical Engineering Department
POWER ELECTRONICS
EELE 5450 — Fall 2009-2010
Instructor: Eng.Moayed N. EL Mobaied
Lecture 16
Slide 2
Chapter six
DC Choppers and DC motor Control
Various methods are available for obtaining a variable dc
voltage from a constant dc source.
There is a demand for changing from one dc voltage to another.
Some of the more important practical applications include
power converters or armature voltage control of dc motors,
converting low or high battery source voltage to levels which
best match practical load requirements, and controlling dc
power for a wide variety of industrial processes.
Slide 3
Chapter six
DC Choppers and DC motor Control
The thyristor converter offers greater efficiently, faster
response, lower maintenance, smaller size, and for many
applications, lower cost than motor-generator sets or gas tube
approaches.
In thyristor-type dc-to-dc converters, commutating circuits are
required similar to those used in many inverters.
Slide 4
Chapter six
SCR Voltage Choppers
Control of a dc motor’s speed by an SCR voltage chopper is
required where the supply is dc (as from a battery) or the ac
voltage has already been rectified to a dc voltage.
Slide 5
Chapter six
SCR Voltage Choppers
Vout could be varied by the following methods:
1. Ton may be varied while T is held constant (PWM).
2. Ton may be kept constant while T is varied (freq. modulation).
3. Combined pulse-width and frequency modulation.
Slide 6
Chapter six
A Free-Wheeling Diode DC Motor Drive Using the Jones Chopper
This circuit is frequently referred to as a chopper circuit.
Slide 7
Chapter six
A Free-Wheeling Diode DC Motor Drive Using the Jones Chopper
End of Lecture **** Eng.moayed