The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
LEDs are widely used in illumination, indication and dimming area. Most commercial LED light dimming system today can achieve rough color temperature regulation with high but nonadjustable color rendering index. However most of these systems are designed for daily illumination, which cannot meet the precise requirement in the laboratory. In this work we achieved the design of color combination system...
Due to low cost and high efficiency advantages, AC-DC single-stage LED driver has been widely used, But there is existing the problem of larger twice line frequency output ripple, and current ripple is one of the important factors to affect LED light-emitting properties and lifetime. A suitable kind of LED driver that single-stage flyback PFC circuit based on auxiliary winding and current ripple suppression...
In the present study, a computational model of LED filament light bulb was established by the ANSYS Icepak software based on the finite element method (FEM) and was compared with the experimental data as well. With the developed model, the effects of the filling gas and the filament substrate on the steady-state thermal performance were investigated. The simulation results revealed that the thermal...
A high product reliability means low failure rate. A low failure rate cannot be achieved without manufacturing reliability excellence. With a few concrete examples, this paper illustrates that reliability excellence in SSL manufacturing is needed and can be achieved.
This paper proposes a wireless power transfer (WPT) system in an LED lighting application. The proposed design is compliant with A4WP standard. The system includes the AC/DC adapter, the transmitter module, the receiver module, the current regulator and the LED lamp. The transmitter module is capable of driving multiple LED lamps at the same time and provides more spatial freedom. The results show...
This paper focus our attention on the deep considerations for LED package technology. The research includes the following content: (i) the influence of binding force between the chip and substrate, the leakage rate of silver paste conductive adhesive, the failure rate of light emission based on different glue quantities from different companies are studied carefully; (ii) a variety of abnormalities...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.