FALL 02 M #2
Design a power stage of a dc-dc converter that provides a regulated 10V from 8 to 14V dc input source.
The load resistance is within the range of 1-5 ohms. The output ripple voltage should be limited to 1%.
Justify your selection of topology,

EL567 Spring07
Final Exam
5/8/07 '
This is an openebook and opennotes exam. You have 2 hours and 15 minutes to solve the following
8 problems:
Problem 1. (33%) Design a power stage of a transformerisolated dcdc converter that
provides a constant 48 V from

FALL 02 M #2
Design a power stage of a dc-dc converter that provides a regulated 10V from 8 to 14V dc input
source. The load resistance is within the range of 1-5 ohms. The output ripple voltage should be
limited to 1%. Justify your selection of topology,

EL5673 Fall10
Midterm
11/03/10
This is an open-book and open-notes exam. You have 2 hours and 30 minutes to solve the following
3 problems:
Problem 1. (30%) A buck-boost converter operates at duty ratio D = 0.4 and delivers 25 W
to a resistance of 1 . The

EL5673 Fall10
Final Exam
12/21/10
This is an open-book and open-notes exam. You have 2 hours and 30 minutes to solve the following
3 problems:
Problem 1. (33%) Design a power stage of a dc-dc converter to power a Pentium microprocessor. The converter is n

15
Transformer Design
In the design methods of the previous chapter, copper loss and m aximum flux density are specified, w hile core loss is not specifically addressed. This approach is appropriate for a number of applications, such as the filter inducto

1
Introduction
1.1
INTRODUCTION TO POWER PROCESSING
The field of power electronics is concerned with the processing of electrical power using electronic devices [17]. The key element is the switching converter, i llustrated in Fig. 1.1. In general, a s wi

13
Basic Magnetics Theory
Magnetics are an integral part of every switching converter. Often, the design of the magnetic devices cannot be isolated from the converter design. The power electronics engineer must not only model and design the converter, but

4
Switch Realization
We have seen in p revious chapters t hat the s witching elements of the b uck, boost, and several other dc-dc converters can be i mplemented using a transistor and diode. One m ight wonder why t his is so, and how to realize semicondu

5
The Discontinuous Conduction Mode
When the ideal switches of a dc-dc converter are implemented using c urrent-unidirectional and/or voltage-unidirectional semiconductor switches, one or more new modes of operation known as discontinuous conduction modes

2
Principles of Steady-State Converter Analysis
2.1
INTRODUCTION
In the previous chapter, the buck converter was introduced as a means of r educing the dc voltage, using only n ondissipative switches, i nductors, and capacitors. The s witch produces a r e

KINGDOM OF SAUDI ARABIA
Ministry Of High Education
Umm Al-Qura University
College of Engineering & Islamic Architecture
Department Of Electrical Engineering
Transmission and
Distribution of
Electrical Power
Dr : Houssem Rafik El- Hana BOUCHEKARA
2009/2010

34 CONTENTS
Chapter 5
Flyback Converter
5.1 The dc input voltage of'a yback PWM converter operating in CCM is the US
single-phase rectied voltage and the output voltage is V0 = 800 V. Find the
transformer t'LlIIlS ratio 21.
The minimum dc input voltage oc

50 CONTENTS
Chapter 8
FullBridge Converter
8.1 Derive an expression fer the voltage stresses of the diodes in the full-bridge
PWM converter with Mull-bridge rectier.
The voltage across the primary winding is
vi = V;
and the voltage across the secondary wi

CONTENTS 3
Chapter 2
Buck Converter
2.1 Derive an expression for the dc voltage transfer function of the buck converter
operated in COM using the voltage across the diode. Neglect power losses.
The voltage at the input of the output lowpass lter L-CRL is

45 CONTENTS
Chapter 7
HalfBridge Converter
7.1 Derive an expression for the voltage stress of the diodes in the half-bridge con-
verter with a full-bridgerrectier.
The voltage across the primary winding is
_1_I
U1 2
and the voltage across the secondary wi