표제지
목차
국문요약 8
Abstract 9
제1장 서론 11
제2장 이론적 배경 13
2.1. 도로조명 사용 환경 13
2.2. LED 도로조명기구 인증 및 시험기준 13
2.2.1. 한국도로공사 「표준 LED조명등기구」 기준 15
2.3. LED소자의 특성 18
2.3.1. 순방향 전류에 따른 광효율(Im/w) 변화 18
2.3.2. 순방향 전류에 따른 정션온도(Tj) 변화 19
2.3.3. 순방향 전류가 LED 수명에 미치는 영향 21
제3장 적용사례 23
3.1. LED 도로조명기구에 사용되는 구성품 23
3.2. 도로조명 사용 환경 및 불량유형 25
제4장 분석 29
4.1. 분석 및 실험 29
제5장 대책 31
5.1. 시스템 제시 31
5.1.1. 기존 시스템 31
5.1.2. 제안 시스템 32
5.2. 시스템 설계 41
5.2.1. 전원 설계 41
5.2.2. 프로그램 설계 49
5.3. 실험 및 결과 52
5.3.1. 1차 Working Sample 결과 및 개선 방향 52
5.3.2. 2차 Working Sample 실험 및 결과 55
제6장 결론 61
제7장 참고문헌 62
부록 63
Table 1. Type of LED module 16
Table 2. Type of Converters 17
Table 3. Forward Current Simulation. Cree LED 18
Table 4. Temperature characteristic. Cree LED 19
Table 5. Customer-Ready-PCT-product Characterizations. Cree LED 20
Table 6. LED road lighting field defect reproduction experiment 30
Table 7. MCU TMS320F28069M Specification 48
Table 8. LED Driver - MCU I/O configuration 49
Figure 1. Korea Ezpressway Corporation LED Luminaires structure 15
Figure 2. Appearance of LED module 16
Figure 3. Converter size and fixture 17
Figure 4. Rate of luminous flux efficiency. Cree LED 19
Figure 5. Influence of forward current on LED lifetime 21
Figure 6. Lifetime prediction program of LED device 21
Figure 7. TM-21 Calculator, Energy Star 22
Figure 8. Korea Expressway Corporation standard LED module(25W) 23
Figure 9. Korea Expressway Corporation standard SMPS Appearance 24
Figure 10. Standard Type LED light Fixture 24
Figure 11. normal LED Tunnel Luminaires 25
Figure 12. LED tunnel lighting in hard environments 26
Figure 13. Types of road lighting problems 27
Figure 14. Device damage type of LED module by Serge 28
Figure 15. Existing system Diagram of LED Light Fixture 31
Figure 16. New system Diagram of LED Light Fixture 32
Figure 17. Current Balancing Circuit Board & MCU 33
Figure 18. Current Balancing Technology 34
Figure 19. Balancing Voltage Circuit PSIM Simulation Circuit 35
Figure 20. Balancing Voltage Circuit PSIM Simulation, Main waveform 36
Figure 21. Current Control Circuit PSIM Simulation, Circuit 37
Figure 22. Current Control Circuit PSIM Simulation, waveform 38
Figure 23. Short/Open Sensing Circuit 39
Figure 24. LED LH351B Datasheet 41
Figure 25. 15V Regulator IC Circuit 42
Figure 26. 3.3 V Regulator IC Circuit 43
Figure 27. Current Control Circuit Diagram 44
Figure 28. Balancing Voltage Circuit Diagram 44
Figure 29. Short/Open Sensing Circuit 46
Figure 30. MCU(TMS320F28069M), Protection circuit of ADC module 47
Figure 31. LED Driver-MCU, Operating diagram 50
Figure 32. Program operating diagram 51
Figure 33. 1st Working Sample-Current Balancing System 52
Figure 34. 1st Working Sample Current Balancing Result 53
Figure 35. 2nd Current Balancing Circuit Board PCB Artwork 55
Figure 36. 2nd Working Sample-Current Balancing System 56
Figure 37. 2nd Working Sample Current Balancing Result 56
Figure 38. 2nd Working Sample, switch device temperature result 57
Figure 39. 2nd Working Sample LED Open Test Result 58
Figure 40. 2nd Working Sample LED Short Test Result 59
Figure 41. 2nd Working Sample LED Short, PWM Duty 59
Figure 42. 2nd Working Sample, Temperature Test 60