Energy Efficient Intelligent LED Lighting System

1. ENERGY EFFICIENT INTELLIGENT
LED LIGHTING SYSTEM
PRIYA JOHNSON
S7 F
ROLL NO : 44

2. CONTENTS
• Introduction
• Existing Systems
• Proposed System
• LED
• Operating principle of proposed system
• Overview of proposed system
• Minimum Light Intensity Control Algorithm
• Hardware Block diagram
• PCB layout of proposed system
• Case study
• Experiment result
• Disadvantages
• Conclusion
• Reference
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3. INTRODUCTION
• Light accounts for approx. 20% of total energy
consumption
• Invention of LED reduces energy consumption of a
light
• The intelligent light control system can reduce
energy consumption
• Automatically control the intensity of illumination
through situation awareness
• About 15% of total energy consumption can be
reduced through light control according to user’s
living pattern
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4. EXISTING SYSTEMS
• Can support ON-OFF / dimming control after
detecting object, intensity of illumination or
controlling with time setting
• It is hard to apply to complex environments
because of presence of variety of users
• Mostly installed in places such as front door or
hallway
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5. PROPOSED SYSTEM
• The new intelligent light control system should be
designed :
 to maximize the utilization of an LED
 to have communication capability
 to control based on the situation awareness
 to enhance both energy efficiency & user
satisfaction
• The system uses multi-sensors & wireless
communication technology
• Control LED light according to user’s state &
surroundings
• Autonomously adjust the min light intensity
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6. LED
• Two lead semiconductor light source
• A PN junction diode which emits light when
forward biased
• The amount of light output is directly
proportional to forward current
• Light energy is released at the junction when
electrons and holes are recombined
• After recombination the electrons in the
conduction band of N-region falls into the holes
in the valance band of P-region
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7. CONTD…
• The difference in energy between the conduction
band and valance band is radiated in the form of
light
• The semiconductor material used for manufacturing
LED:
Gallium arsenide-infrared radiation
Gallium phosphide-red or yellow
Gallium arsenide phosphide-red or green
Gallium nitride-blue
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8. OPERATING PRINCIPLE OF
PROPOSED SYSTEM
Lmin – minimum light intensity
Lmax – maximum light intensity
Tr - rise time period of light intensity
Tm - time period b/w no movement detection &
that light intensity begins to fall
Tf - fall time period of light intensity
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9. CONTD…
8
• Illumination intensity becomes Lmax if user
movement is detected
• Illumination intensity becomes Lmin if user
movement is not detected for a certain time period

10. CONTD…
• As Tr is longer, Tm & Tf are smaller and Lmax & Lmin
are smaller, energy saving effects becomes larger
• Inconvenience of users can be bigger
• Necessary to properly set the value to space
environmental characteristics
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11. OVERVIEW OF PROPOSED SYSTEM
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12. CONTD…
• Autonomous control based on user movement
• Autonomous control based on brightness of room
• Autonomous optimization of system control & state
variables
• Collective control using a wireless technology
• Control & system setting through a wireless controller &
a mobile phone application
 Reduce energy consumption via interaction with
information about user’s state
 Autonomous control could lead to disturbance to
residents
 It automatically optimizes the system control & state
variables 11

13. MINIMUM LIGHT INTENSITY
CONTROL ALGORITHM
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14. CONTD…
• Signal of inconvenience received from users via
smart phones
• Count down timer interrupts system after a certain
time period
• The system automatically adjusts Lmin based on
signal of inconvenience
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15. CONTD…
1. Check whether a signal of inconvenience has
occurred. If a signal of inconvenience has
occurred, then Lminn = (Lmincon+Lminn-1)/2, Lminincon =
Lminn-1, n = n + 1,and timer = T. Check again
whether a signal of inconvenience has occurred.
2. If a signal of inconvenience has occurred do as in
step 1, then If a signal of inconvenience has not
occurred, then check whether timer =0
3. If timer =0, then Lminn = (Lminincon+Lminn-1)/2,
Lmincon =Lminn-1, n = n + 1, and timer = T. And then,
check whether Lmincon - Lminincon <5 or not. If timer is
not equal to zero, check again whether a signal of
inconvenience has occurred. 13

16. CONTD…
4. If Lmincon - Lminincon < 5, then terminate this
flowchart. If Lmincon - Lminincon not < 5, then go to
step 5
5. Check whether a signal of inconvenience has
occurred. If a signal of inconvenience has
occurred, then Lminn = (Lmincon+Lminn-1)/2, Lminincon
= Lminn-1, n = n + 1,and timer = T. If a signal of
inconvenience has not occurred, then perform
again from Step 3
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17. HARDWARE BLOCK DIAGRAM
15
• 8 bit microcontroller : Role in situation analysis,
event processing, and learning. This part optimizes
the control and state variables to adapt itself to the
various environments.
• Motion detection sensor : detects moving objects
• CDS sensor :Cadmium sulphide – photo resistive
sensors

18. CONTD…
• ZigBee module : Used for communication with other
LED lighting system and networked devices
• LED driver part : Consists of current controller
modules for driving LEDs
• There are two ports that are controllable and are
able to control for 255 levels of brightness
• The power part is composed of a power regulator
& SMPS
16

19. PCB LAYOUT OF PROPOSED
SYSTEM
• When switch g is On & h is On ; switch a, b and c
are used to adjust Lmax ; switch d, e, and f are used
to adjust Lmin
• When switch g is On & h is Off ; switch a, b, and c
are used to adjust Tr ; switch d, e and f are used to
adjust Tf 17

20. CONTD…
• When switch g is Off & h is On ; switch a, b, and c
are used to adjust countdown timer(Tm)
• If switch g is Off & the h is Off ; the proposed
system operates as a general LED lighting without
intelligent lighting control.
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21. CASE STUDY
• Home and office building : User satisfaction is an
important factor ; Lmin is set to the high value
• Warehouse : User satisfaction is a less important
factor ; Lmin is set to low value ; a significant amount
of energy consumption can be reduced
• Parking lot : User satisfaction is an less important
factor ; Lmin is set to the high value only from the
entrance of the parking lot to a vacant parking
space ; when a user gets out of a car, Lmin is set to
the high value only from user's current position to
the entrance of the building
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22. EXPERIMENT RESULT
• The proposed lighting control system reduces
energy consumption up to approximately 21.9%.
20

23. DISADVANTAGES
• Initial cost of LED system is high, but it can be
overcome in the long run
• Implementation of proposed system to the existing
system is difficult because it requires
implementation of additional components to each
and every building
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24. CONCLUSION
• Utilizes multi sensors and wireless communication
technology in order to control an LED light
according to the user’s state and the surroundings
• Can autonomously adjust the minimum light
intensity value to enhance both energy efficiency
and user satisfaction
• Reduces total power consumption up to 21.9%.
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25. REFERENCES
[1]Jinsung Byun,Insung Hong,Byoungjoo Lee,Sehyun
Park, "Intelligent Household LED Lighting System
Considering Energy Efficiency and User
Satisfaction,” IEEE Trans. on Consumer
Electron.,Vol .59 , No.1, Feb.2013
[2] S. Matta and S. M. Mahmud, "An intelligent light
control system for power saving," in Proceedings of
the Annual Conference of the IEEE Industrial
Electronics Society, pp. 3316-3321, 2010
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26. 24
THANK YOU…

27. QUESTIONS???
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