Date

Place

[3-4]
10:15 ~ 10:30
Title:Diagnostic Method Using Discrete Components for LED Lighting Systems
Yae-Yun Joung, Kyu-Cheol Kang, and Kil-Yoan Chung (Samsung Electronics Co., Ltd., Korea)
Abstract: As a result of continous technical development for solid state light source, we can find application in general purpose lighting, automotive lighting, as well as for display systems like TV. ?????? Specially, light emitting diodes(LEDs)are repidly replacing the existing lighting sources such as fluorescent lamps and HID lamps for vehicle worldwide. ?????? Finally, the consumers want more sensitive and smart function for their lighting system. Among the requirements, the most basic function is the detection of LED failure. ?????? For example, accoding to the ISO26262 stadard, automotive head lamps should be desinged to follow the instruction of Class B because of the fuctional safety. ?????? If the LED module has problem, LED driver/microcontroller recognizes it and inform to user through the body control unit. ?????? Specifications of LED module, however, are very diverse and the function of driving IC is limited by the number of LED channels and definition of LED protection modes. ?????? In order to solve these kinds of difficulties, In this paper, a method of LED protection using discrete component is proposed which can be used for both automotive and general lighting and the proposed protection circuit is veryfied by PSIM simulation.
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