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LED power driver reliability circuit design

Author: XiaoQiang
Tutor: YeXingNing
School: University of Electronic Science and Technology
Course: Microelectronics and Solid State Electronics
Keywords: LED drivers The Reliability Design Protection Circuits
CLC: TM923.34
Type: Master's thesis
Year: 2011
Downloads: 188
Quote: 0
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Abstract


In recent years, with the energy-saving and environmental protection has become a major theme of our times, LED lighting drivers are pushed to the forefront of the lighting market. In the year 2010, The project of ten city with million lamp, the World Expo in Shanghai and the light projects in Guangzhou Asian Games push China’s LED lighting market toward emphatically. At the same time, the risk of overheating appears, such as immature technology industry and blind expansion. To ensure the development of LED market rapid and well, except continuously reducing in the cost of LED lighting products to make the market more receptive, the efforts to develop LED lighting technology, and to ensure the products practical and reliable are the fundamental. The characteristics of the LED determine the reliability design of LED driver circuit is the key to design a reliable LED lighting product. Therefore, this study focuses on the analysis and design on the reliability of LED power-driven, and designs the various reliability circuits in a DC-DC controller chip which is used to drive LEDs directly by constant current.This paper introduces the special nature of LED, the importance of reliability circuit design on the design of LED drivers, circuit topologies commonly used in LED drivers, and the variety of power system anomaly analysis. Then the drive scheme contained two steps that a constant voltage is produced first followed with a constant current output stage is determined to realized 100W_LED lamp driver design, and the first AC-DC stage is designed with flyback topology to get a constant voltage output, and while achieving the PFC and the isolation with line. Then designing the second DC-DC stage with Buck topology to get a constant current output .And according to the drive requirements a controller chip basises on the controlled on-timer(COT) architecture which is combinated hysteretic model and a one-shot on-timer is designed to implement the second stage output 2.1A constant current specifically. This paper focuses on the reliability design of the circuit both on the system-level and the chip-level. As silicon chips has not yet come back, a variety of protection circuits are just simulated with software.

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electrical lighting > Bulbs \u0026 Tubes > Semiconductor light emitting light
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