An intelligent inverter for a high-power LCD backlight

Abstract— To resolve some of the problems encountered in developing a high-power inverter for an LCD backlight with multiple cold-cathode fluorescent lamps (CCFLs), we developed an intelligent dc-ac inverter unit with the following special functions: (1) stabilization of the power consumption within several minutes of power-on, (2) dispersion of the inrush current at power-on, and (3) low switching noise on the power-source line.     

An inverter with a quasi-synchronous dimming function

Abstract— We have developed a high-dimming-ratio inverter, which is controlled by a digital circuit. The dimming function is synchronized with a half-cycle of a Buck-Royer inverter. A dimming ratio of 100:1 was obtained by using this technique.     

Effect of Gas Atoms on Recovery of Work Hardening in Al-Li Alloys

In the first report of this study, dealing with CCFL and CCFL breakdown phenomena associated with the injection of emergency core cooling spray water into upper plenum during refill-reflood phase of a BWR LOCA, the following tests results were obtained.

The injected water maintained two-phase pool across the top of entire core after CCFL breakdown. The pool level oscillated near spray elevation. The objective of this paper is to clarify the mechanism of these phenomena, evaluating steam and spray flow effects on CCFL breakdown.

It is found that when spray flow rate was slightly larger than the CCFL drainage deter- mined by core steam flow, pool maintained at some constant level near spray elevation, after CCFL breakdown. On the other hand, when spray flow was appreciably larger than CCFL drainage, pool level slowly oscillated. The oscillation was caused by significant changes in steam condensation rate, and the corresponding subcooling penetration into the fuel bundles, when the pool level passed the spray elevation. The TRAC-BD1 analysis of test results suggested the small sector wall effect of test apparatus on CCFL breakdown phenomena.     

CCFL的亮度特性及其驱动电路分析

背光组件中主要的发光器件冷阴极荧光灯(CCFL)具有特定的电气特性，通过实验研究了CCFL的与发光亮度和发光效率有关的特性，定性地分析了CCFL的自激振荡电路的工作原理。并在此基础上，对逆变振荡电路进行了定量的理论分析，为设计高效率驱动电路提供参考依据。     

LCD backlights,light sources,and flat fluorescent lamps

Abstract— Backlights are indispensable for the operation of LCDs. Light sources or lamps are the core components of backlights. There are many types of light sources for backlights such as cold cathode fluorescent lamps (CCFLs), external electrode fluorescent lamps (EEFLs), hot‐cathode fluorescent lamps (HCFLs), flat fluorescent lamps (FFLs), and light‐emitting diodes (LEDs). Recently, FFLs are becoming one the most interesting light sources for LCD‐TV backlights. Channel profiles and the structure of FFLs in more detail are discussed in this paper. The channel profile of FFLs with maximum brightness uniformity was designed, fabricated, and characterized. The FFL backlight demonstrated 10,500 nits and the total power consumption was 110 W at room temperature.     

The characteristics of the external‐electrode mercury fluorescent lamp for backlighting liquid‐crystal‐television displays

Abstract— A reliable external‐electrode mercury fluorescent lamp (EEFL) has been developed for backlighting a liquid‐crystal‐television (LC‐TV) display. This involved the investigation of the EEFL characteristics and the improvement in the construction of the EEFL and drive waveforms, in the frequency range of 50–200 kHz, that affects the EEFL characteristics. The results showed that a sinusoidal waveform is suitable for driving the EEFL, and EEFL's voltage decreases when the frequency of the drive waveform is increased.     

垂直管内气液两相逆流极限管径效应实验

在压水堆安全性分析中,需准确预测气液逆流极限(CCFL)工况下两相流动关系。本文采用水下淹没排气的实验方法,对相同管长不同管径垂直管的CCFL特性进行可视化实验,并对垂直管CCFL关联式模型进行分析,主要结论有:①在CCFL工况下垂直管内流型为环状流动;表观气速较大时,大管径管内液膜呈搅拌状,小管径管内液膜呈波动状;随表观气速减小,均转为液面光滑的自由降膜流动;②Wallis数模型过度关联了管径变化对垂直管CCFL特性的影响;Kutateladze数和Froude-Ohnesorge数模型也不能良好关联垂直管CCFL特性的管径效应;③提出了新的CCFL无量纲参数和相应的实验关联式,由此可使垂直管CCFL特性的管径效应得以统一表征,还可以关联物性参数变化的影响。     

一种直下式LED背光源驱动电路的设计

传统的背光源采用的是CCFL,色彩还原性差,含有对人体有害的汞蒸汽。LED背光源是一种新型的背光源,色彩还原性好,寿命长;不含汞,有利于环境保护。本文设计的直下式LED背光源,单灯电流可精确控制,光学效果良好,支持PWM调光。中尺寸、大尺寸LED背光源均可借鉴使用。     

Spray Cooling Test

A steady separate effects test on BWR spray cooling was performed at relatively high system pressures using the ROSA-III test vessel. These tests were conducted in order to promote a better understanding of the thermal-hydraulic phenomena in LOCA experiments and to obtain information necessary for improvement of analytical codes. The fraction of entrainment or overflow for various spray conditions was obtained and the data of CCFL at the upper tie-plate were compared with correlations. It was shown that the occurrence of CCFL significantly diminished core cooling effects and that rod quench by fall back water was quite irregular and unstable. Reflood core cooling was also studied.     

压电变压器的原理及其应用中的关键问题

文章简要介绍了压电变压器的工作原理。着重对压电变压器在应用过程中的关键技术问题做了研究与探讨，并根据压电变压器的特性设计制作出两种实用的电子线路。