| 英文摘要 |
Light emitting diodes (LEDs) are becoming attractive light sources because of the advantages of small size, better color saturation, fast response, high plasticity, and long life-time. With the improvement in the light intensity and efficiency, lamps composed with LEDs can be used for many applications, including for fishing lamps, can be expected. This achievement, however, resorts to the better understanding on the operating characteristics of LEDs. The problem is that the operating characteristics of LEDs are not consistent under different operating conditions, but in fact are significantly affected by the ambient temperature, the operating current, the used period as well as the types of the diodes. The relationships between these operating conditions and the equivalent light characteristics from LEDs are not clearly revealed. This project will set up a test system with a temperature-controlled compartment and a controllable current source to emulate various operating conditions of the lighting modules of LEDs. By the investigation the effects on the operating characteristics of LED modules from numerous experimental results, proper functions of related parameters will be deduced. In addition, a suitable circuit model can be derived for the designing and analyzing the circuit with LED modules. Throughout this project the relationships between lighting characteristics and the ambient temperature, the operating current, the LED type and the used period can be clear. The investigated results can be helpful for the design of the fishing lamp with LEDs. |