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Energy Efficient Intelligent LED Lighting System

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Energy Efficient Intelligent LED Lighting System

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Energy Efficient Intelligent LED Lighting System

  1. 1. ENERGY EFFICIENT INTELLIGENT LED LIGHTING SYSTEM PRIYA JOHNSON S7 F ROLL NO : 44
  2. 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 1
  3. 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 2
  4. 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 3
  5. 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 4
  6. 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 5
  7. 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 6
  8. 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 7
  9. 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. 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 9
  11. 11. OVERVIEW OF PROPOSED SYSTEM 10
  12. 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. 13. MINIMUM LIGHT INTENSITY CONTROL ALGORITHM 12
  14. 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 14
  15. 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. 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 14
  17. 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. 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. 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. 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. 18
  21. 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 19
  22. 22. EXPERIMENT RESULT • The proposed lighting control system reduces energy consumption up to approximately 21.9%. 20
  23. 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 21
  24. 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%. 22
  25. 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 23
  26. 26. 24 THANK YOU…
  27. 27. QUESTIONS??? 25

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