ENERGY EFFICIENT INTELLIGENT LED LIGHTING

SYSTEM

PRIYA JOHNSONS7 FROLL NO : 44

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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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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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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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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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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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 greenGallium nitride-blue

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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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CONTD…

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• Illumination intensity becomes Lmax if user movement is detected

• Illumination intensity becomes Lmin if user movement is not detected for a certain time period

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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OVERVIEW OF PROPOSED SYSTEM

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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

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MINIMUM LIGHT INTENSITY CONTROL ALGORITHM

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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

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.

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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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HARDWARE BLOCK DIAGRAM

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• 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

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

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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

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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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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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EXPERIMENT RESULT

• The proposed lighting control system reduces energy consumption up to approximately 21.9%.

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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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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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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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THANK YOU…

QUESTIONS???

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