الفهرس 
ANALYSIS OF SDTGLE fl1ASE CONVERTER CIRCUIT FOR LIGHTING CONTROLOnly 14 pages are availabe for public view
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Abstract
Light is one form of energy. Illumination loads
are classified as one of the essential consumers of electrical
energy. Therefore, it is important to apply some
means of control of light intensity in practical applications
such as lighting of studiGs, air ports, emergency
lamps, flashing lamps and other uses of illumination
loads.
The present research starts with an explanation of
the basis of light regarding its nature and some basic
relations in lighting engineering, and a display of some
terms. The introduction of the thesis work contains a
classification of the different types of lighting sources
and efficiency of each one. There is also an explanation
of two different types of artificial light sources namely
incandenscent lamps and discharge lamps. At the end of
the first chapter there is an explanation of the traditional
ways of controlling illumination. In the second
chapter there is a detailed explanation of single phase
converter circuit. An analysis of the converter circuit
is carried out considering the lamp as a pure resistance
and considering the semiconductor elements as ideal
switches. Both average and effective values of load ii
voltage are computed. This chapter also includes harmonic
analysis of the voltage and calculations of higher harmo-
nics. It also includes a method for the calculation of the
power factor of the circuit. At the end of this part a
mathematical relation between absorbed power and output
light from the lamp is obtained.
The third chapter includes an explanation of the
experimental circuits in control of lighting uning thyristors.
The study starts with a circuit to control light
loads with few hundred watts then a display of simple full
wave for more developed control circuits is made. A sim-
ple type of thyristor circuits which is called triac has
been also used as controllers. This chapter includes a
description of building up and testine the experimental
circuits for control of lighting using triacs.
The following relations have been experimentally
determined
1. Variation of load voltage with firing angle.
2. Variation of load current with firing angle.
J. The effect of variation of firing angle on illumina-
tion.
4. Variation of output power with firing angle. 5. Relation between input power and the luminance of the
lamp.
6. Comparison between converter circuit and conv~ntional
methods in control of light.
By the end of this chapter an overview of modern
technique using integrated circuits in triggering the
triac is given.
iii
The fourth chapter includes a description of different
ways of controlling discharge lamps starting vvith
behaviour of this kind of lamps and conditions of the
lamps at starting and run up. In this chapter the importance
of using starter and a choke coil in conjunction with
these kinds of lamps is discussed. The study includes a
description of some kinds of electric chokes using res is-
tors,coils, capacitors, coils with capacitors as well as
electronic chokes. This chapter also contains a brief
explanation of some kinds of electric discharge lamps
such as fl~Orscent lamps, their circuits, methods of
starting and lighting control.
It also provides a display of high frequency flUQrescent
lamps, high pressure sodium lamps, low pressure
sodium lamps and mercury lamps.