Based On The Theory Of Visual Comfort And Reliability Of The Led Drive Technology Research

As the development of LED chips preparation technology continues to mature, how to provide efficient and comfortable, reliable lighting environment has become the main problem of LED application research. The thesis does the research on high performance LED drive technology based on the theory of reliability and visual comfort, providing theoretical basis and guidance for the future optimal design of LED driver.Firstly, the paper discusses the mechanism of lighting visual comfort based on the human visual system and visual psychology, and analyzes the relationship between distribution of the power spectrum and visual comfort. Considering the different LED drive will have impact on spectrum power distribution by different energy type, the connection is established between LED driver design and lighting visual comfort. Few evaluation indexes concerned of LED driver are extracted from existing lighting quality evaluation system as the theoretical foundation for the following chapter’s research.Secondly, the thesis analyzes the LED waveform, proposes several typical circuit output waveforms, then builds experimental platform for testing the influence of different drive waveform on the LED light output fluctuation and the color shift. The experimental results show that the output circuit ripple coefficient increases will lead to light output fluctuation increased, but the different impact of light output ripple coefficient is weaken under high frequency driver condition (>10kHz). Thus increasing the circuit’s ripple to reduce the need of capacitor storage becomes a practical way to realizing the non-electrolytic capacitor design. The experiment of LED driver’s impact on color shift show that, few differences exist between the impact of different LED driver waveform. While RGB monochrome LED’s color show diverse driving characteristics, needing different color feedback control design. At the same time, the paper illustrates how to use the result in the multi-output RGB mixing LED driver design.In the last, the study analyzes the LED drive reliability. Key components are founded through calculating the driving circuit’s reliability. Examples show the role of key components design for changing the circuit reliability. The concept of LED driver’s best work area and temperature control method are presented by the analysis of LED’s light-electrical-thermal-life comprehensive model. This paper mainly includes the following innovative points:1. The present studies mostly analyze LED driver from circuit perspective. This paper innovatively establishes the connection between the visual comfort and LED driver. Studying the driver design technology and providing practical guidance from the lighting visual comfortable consideration.2. Different from existing research method using visual ergonomics theory to study light source stroboscopic, this paper designs the experiment to measure the impact of several typical drive waveform of LED fluctuations. The experimental results provide theoretical basis for the non-electrolytic capacitor and multiple output RGB mixing LED driver design.3. Through the calculation of reliability of circuit, key components in LED driver are founded. The redesigned capacitor effectively promotes the driver system reliability.4. The LED light-electrical-thermal-life comprehensive lays the foundation for power and temperature feedback control of LED drier, in order to realize the long long-life LED lamp system.