![]() The No.2 sample is the faulty LED lamp with replacing the capacitor C1 by 1 u F Average value analysisįig. As shown in Table 2, the No.1 sample is fault-free LED lamp, and namely Fault-free Type. The component’s parameter of the LED lamp are shown as Table 1.Īim to conduct experiments, three OSRAM’s LED lamp samples are prepared as samples. The interior circuit of the LED lamp is shown as Fig. The OSRAM 8.5 W LED lamps (Type No.: LED STAR CLASSIC A 40) using linear driver are selected as the experiment sample. Section 3 presents the time and frequency domains characteristics comparative analysis among fault-free and faulty LED lamps. The remainder of this paper is structured as follows: Section 2 describes the experimental data and analysis method. The OSRAM 8.5 W LED lamps using linear driver are selected as the experiment sample. In this paper, the time and frequency domains characteristics of light output waveform among fault-free and faulty LED lamps are extracted and comparative analyzed, involving average value, coefficient of variation, and frequency spectrum. , illumination waveform fluctuation similarity calculation between fault-free and faulty LED lamps has been proposed for fault detection and diagnosis. , the fault detection and diagnosis algorithms of LED lamps is proposed with light output waveform characteristics using first-order difference calculation and peak-detection methods. Recently, in spite of this, our research team have contributed to the fault detection and diagnosis methods of LED lamps driven by segmented linear solution. At present, there are few literatures on fault diagnosis of LED lamps. Hence, it’s of great significance to focus on the fault detection and diagnosis method of LED lamps with the light output characteristics. Moreover, some LED lamps’ faults can be seen and identified with the human eyes, and the potential failure is hard to see. However, the faulty LED lamps can cause the decrease of light efficiency, lead to flicker, and affect the visual comfort of users, , ]. Currently, LED lighting technology have been widely used in the world, such as indoor and outdoor environment, plants factories, vehicle etc, ,, ]. The research results provide the chance for fault detection and diagnosis of LED lamps with optical features.Īs the novel green light source, LED lamps have the advantages of high color rendering index, high light efficiency, low power consumption, high reliable, small size, long lifespan and environment-friendly use, as compared to other lighting systems, , ]. However, by comparison with fault-free LED lamps, the Fourier spectrum’s component of faulty LED lamps are more complex, including more obvious harmonic components and noise spectrum. Finally, the Fourier spectrum’s base frequency of light output waveform of fault-free LED lamps is 100 Hz, and also including two obvious harmonic components, that are 200 Hz and 300 Hz. Secondly, after lighting, the coefficient of variation of light output waveform of faulty LED lamps are obviously higher than fault-free LED lamps. Firstly, after lighting, the average value of light output waveform of faulty LED lamps are obviously lower than fault-free LED lamps. The comparative analysis results demonstrate that there are obvious difference among fault-free and faulty LED lamps in the light output waveform. Experiment setup is built with Light Flicker Analyzer and integrating sphere, and OSRAM 8.5W LED lamps using linear driver are selected as the experiment samples. To discover the fault detection and diagnosis method of LED lamps with the light output waveform, in this paper, the time and frequency domains characteristics of light output waveform among fault-free and faulty LED lamps are extracted, involving average value, coefficient of variation, and frequency spectrum, and the difference are comparative analyzed.
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