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Fan, Songli (author), Ai, Qian (author), Piao, L. (author)Battery energy storage (BES) and demand response (DR) are considered to be promising technologies to cope with the uncertainty of renewable energy sources (RES) and the load in the microgrid (MG). Considering the distinct prediction accuracies of the RES and load at different timescales, it is essential to incorporate the multi-timescale...journal article 2018
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Zhang, H. (author), Liu, Yang (author), Wang, Lingen (author), Fan, Jiajie (author), Fan, Xuejun (author), Sun, Fenglian (author), Zhang, Kouchi (author)High reliable packaging materials are needed for electronics when they work at harsh environments. Among which, the nanosilver material has been widely studied and applied in power electronics due to its low processing temperature and high reliability. This paper investigates the bonding properties of nanosilver sintered hermetic cavity. There...journal article 2018
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Sun, Bo (author), Fan, Xuejun (author), van Driel, W.D. (author), Cui, Chengqiang (author), Zhang, Kouchi (author)In this study, we present a general methodology that combines the reliability theory with physics of failure for reliability prediction of an LED driver. More specifically, an integrated LED lamp, which includes an LED light source with statistical distribution of luminous flux, and a driver with a few critical components, is considered. The...journal article 2018
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Sun, B. (author), Fan, J. (author), Fan, Xuejun (author), Zhang, Kouchi (author)This work studies the effect of randomness of LED's lumen depreciation on reliability of the entire LED lamp. An integrated LED light bulb is selected as carrier of the proposed method. A PoF based lumen depreciation model and electronic-thermal simulations are introduced for reliability prediction. The normal distribution is used to describe...conference paper 2018
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Cui, Z. (author), Chen, Xianping (author), Fan, Xuejun (author), Zhang, Kouchi (author)Interfacial properties of Cu/SiO2 in semiconductor devices has continued to be the subject of challenging study for many years because of its difficulties in experimentally quantifying the critical strength of interface. In this paper, a multi-scale modeling approach is built to characterize the interfacial properties between Cu and SiO2. In...conference paper 2018
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Qian, C. (author), Mirza Gheytaghi, Amir (author), Fan, J. (author), Tang, H. (author), Sun, B. (author), Ye, H. (author), Zhang, Kouchi (author)As an increasing attention towards sustainable development of energy and environment, the power electronics (PEs) are gaining more and more attraction on various energy systems. The insulated gate bipolar transistor (IGBT), as one of the PEs with numerous advantages and potentials for development of higher voltage and current ratings, has been...journal article 2018
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Fan, Ke (author), Chan, Edwin H.W. (author), Qian, QK (author)It is claimed that transaction costs (TCs) affect the effectiveness of any green building (GB) policy. However, few studies have empirically applied TC analysis to GB incentives, which normally should have analyzed the TCs borne by different stakeholders. These include TC typology and determinants during the implementation process, especially...journal article 2018
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Vismara, R. (author), Dane Linssen, N. P. (author), Wang, Ken X. (author), Fan, Shanhui (author), Isabella, O. (author), Zeman, M. (author)We present a modelling study of thin silicon based solar cells endowed with periodic and decoupled front/back textures. After careful optimization, the proposed device models exhibit absorption beyond the Lambertian light trapping limit for a wide range of light angles of incidence. The advanced light management scheme is applied to (nano...conference paper 2018
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Lu, G. (author), Fan, Xuejun (author), Fan, Jiajie (author), Zhang, Kouchi (author)Color stability is of major concern for LED-based products. Currently, much effort is done on lumen maintenance, and for color shift, no agreed method currently exists, be it from testing or from prediction side. To investigate the physics of color shift, we present experiments of each individual part failure of each individual part that are...book chapter 2018
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Sun, B (author), Fan, Xuejun (author), Zhang, Kouchi (author)This chapter investigates the reliability of the integrated LED lamps with electrolytic capacitor-less LED drivers. Firstly, the impact of the interaction between the degradations of the LED light source and the driver on the lumen depreciation is studied. The electronic-thermal simulation was carried out to obtain the history of temperatures of...book chapter 2018
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Tang, H. (author), Ye, Huai-Yu (author), Chen, Xian-Ping (author), Qian, Cheng (author), Fan, Xue-Jun (author), Zhang, Kouchi (author)In this paper, the heat transfer performance of the multi-chip (MC) LED module is investigated numerically by using a general analytical solution. The configuration of the module is optimized with genetic algorithm (GA) combined with a response surface methodology. The space between chips, the thickness of the metal core printed circuit board...journal article 2017
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Sun, B. (author), Fan, Xuejun (author), Ye, H. (author), Fan, Jiajie (author), Qian, Cheng (author), van Driel, W.D. (author), Zhang, Kouchi (author)In this paper, an integrated LED lamp with an electrolytic capacitor-free driver is considered to study the coupling effects of both LED and driver's degradations on lamp's lifetime. An electrolytic capacitor-less buck-boost driver is used. The physics of failure (PoF) based electronic thermal simulation is carried out to simulate the lamp's...journal article 2017
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Fan, Jiajie (author), Mohamed, Moumouni Guero (author), Qian, Cheng (author), Fan, Xuejun (author), Zhang, Kouchi (author), Pecht, Micheal (author)With the expanding application of light-emitting diodes (LEDs), the color quality of white LEDs has attracted much attention in several color-sensitive application fields, such as museum lighting, healthcare lighting and displays. Reliability concerns for white LEDs are changing from the luminous efficiency to color quality. However, most of the...journal article 2017
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Fan, Ke (author), Wei, Gu (author), Qian, QK (author), Chan, Edwin (author)Green building (GB) policies have been implemented to promote GB and address climate change. Most of the existing literatures have studied the costs and benefits of developing GB, without considerations of GB policies’ impacts. This paper aims to study costs and benefits of implementing GB policy from developers’ perspective. It takes the Gross...conference paper 2017
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Qian, Cheng (author), Fan, Jiajie (author), Fang, Jiayi (author), Yu, Chaohua (author), Ren, Y. (author), Fan, Xuejun (author), Zhang, Kouchi (author)By solving the problem of very long test time on reliability qualification for Light-emitting Diode (LED) products, the accelerated degradation test with a thermal overstress at a proper range is regarded as a promising and effective approach. For a comprehensive survey of the application of step-stress accelerated degradation test (SSADT) in...journal article 2017
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Qian, Cheng (author), Fan, Jiajie (author), Fan, Xuejun (author), Zhang, Kouchi (author)The spectral power distribution (SPD) is considered as the figureprint of a light emitting diode (LED). Based on the analysis on its SPD, a method to predict both lumen depreciation and color shift for the phosphor converted white LEDs (pc-LEDs) is proposed in this paper. First, the entire SPD of a pc-LED is predicted by superimposing two...journal article 2017
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Sun, B. (author), Fan, Xuejun (author), Li, Lei (author), Ye, H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)This paper studies the interaction of catastrophic failure of the driver and LED luminous flux decay for an integrated LED lamp with an electrolytic capacitor-free LED driver. Electronic thermal simulations are utilized to obtain the lamp's dynamic history of temperature and current for two distinct operation modes: constant current mode (CCM...journal article 2017
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Sun, B. (author), Fan, Xuejun (author), Fan, J. (author), Zhang, Kouchi (author), Qian, Cheng (author)In this work, a physics-of-failure (PoF) reliability prediction methodology is combined with statistical models to consider the interaction between the lumen depreciation and catastrophic failures of LEDs. The current in each LED may redistribute when the catastrophic failure occurs in one of LEDs in an array, thus affecting the operation...conference paper 2017
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Tang, H. (author), Ye, H. (author), Wong, K.Y. (author), Leung, Stanley Y.Y. (author), Fan, Jiajie (author), Chen, Xianping (author), Fan, Xuejun (author), Zhang, Kouchi (author)The objective of this study is to quantitatively evaluate the impacts of LED components on the overdriving reliability of high power white LED chip scale packages (CSPs). The reliability tests under room temperature are conducted over 1000 h in this study on CSP LEDs with overdriving currents. A novel method is proposed to investigate the...journal article 2017
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Chen, Liangbiao (author), Zhou, Jiang (author), Chu, Hsing-wei (author), Zhang, Kouchi (author), Fan, Xuejun (author)While moisture diffusion in microelectronic device and packaging has been studied for decades, the problems involving complex nonlinear moisture diffusion in multi-material assembly have not been fully studied. This paper has developed a general nonlinear diffusion model by adopting water activity, a continuous state variable, as the field...journal article 2017