IR采用绿色芯片控制白光

Carbon Design Systems公司(下称Carbon公司)把VHDL增加到其语言覆盖范围(以Verilog和C两种语言为基准)之中,又在将其地理覆盖范围扩大到欧洲.Carbon公司的任务是提高模块和系统验证的速度,目标是模拟领域的最高境界:能在尚未实现的硬件上运行早期代码.要达到这一目标,问题始终在于使硬件模拟程序运行得很快,足以供你在合理的(真实)时间内,在硬件上运行有用数量的早期代码,换句话说,就是实现硬件和软件的真正并行设计.     

IR发布荧光灯镇流器控制芯片

提到照明市场的主流白炽灯,大众消费者应该很熟悉。那么荧光灯呢?您对它有多少了解。应该有很多人分不清荧光灯与白炽灯有什么区别。但作为照明市场的新兴力量,因其绿色节能的特性,荧光灯已经在悄悄取代白炽灯,在市场上占有越来越多的份额。甚至在澳大利亚,政府已经出台了强制性政策,一切公共照明必须采用     

新型电子镇流器控制芯片IR2156

文中介绍了一款低成本、高效电子镇流器控制芯片IR2156的主要特点和功能模式 ,给出了由IR2156组成的紧凑型节能灯和普通荧光灯电子镇流器的应用电路     

单周期控制芯片IR1150的应用

文中详细分析了单周期控制电路的原理,介绍了IR1150芯片的特点、结构、工作原理以及典型应用电路。IR1150功率因数校正控制芯片采用单周期控制技术（One-Cycle Control,OCC）,无需传统PFC芯片的电压采样以及模拟乘法器,大大简化了PFC电路的设计和减小产品体积、降低成本。     

可调光电子镇流器控制芯片IR21592/3

IR21592／IR21593是IR公司于2004年推出的一款新型可调光电子镇流器控制驱动器IC。该芯片集成了全调光镇流器控制器和600V半桥驱动器,可实现无变压器灯功率感知相位控制,简化了从不可调光到可调光镇流器需做的改动。外部可控参数包括：预热时间和电流,点燃到凋光时间,和全调光接口等,这给予镇流器设计工程师以很大的灵活性。该IC包括灯点燃失败保护、灯丝失效保护、过温保护、灯在正常工作过程中熄灭的保护以及自动重启功能。该控制IC的核心压控振荡器可以由外部元件设定其最低工作频率。IR21592／IR21593有DIP16和SOIC16两种封装形式。IR21592同IR21593两种型号主要区别在死区时间和频率范围的数值上。     

可调光电子镇流器控制芯片IR2159及其应用

IR2 15 9是可调光荧光灯电子镇流器控制芯片 ,它集镇流控制器与 6 0 0V半桥驱动器于一体。可根据需要调整预热时间、预热电流、从触发到调光的过程时间、最小和最大的发光功率。具有模拟量调光输入接口、完善的故障自保护功能。文章介绍了IR2 15 9典型应用和预热、触发、调光、自我保护等基本工作原理。     

白光LED驱动芯片撷英

目前,很多制造商正在促进白光LED驱动电路的产品化,十几家公司在生产应用于L C D的背光LED驱动芯片。为了得到更清晰的画面,厂商增加了驱动背光白光LED的能力。很多的产品,用单个芯片能够驱动4个以上的白光LED。白光LED驱动芯片市场的价格竞争非常激烈。大多数产品的平均单价是     

大规模集成芯片IR2130触发器

详述了芯片内各环节的工作原理及所起作用,阐释了电路悬浮的工作情况,结合逆变器主回路,给出整个触发系统的电路框图,特别是对各个保护环节做出了深入的分析。虽未涉及芯片的具体应用,却为应用提供了坚实的理论基础,为全面掌握本芯片提供了可能性。     

功率因数校正和镇流器控制芯片IR2167(S)

IR2167是完全集成、完全保护，可驱动所有类型荧光灯的600V电子镇流器控制芯片。PFC电路以临界导通模式(CCM)工作，可获得很高的功率因数，并具有较低的谐波系数(THD)且直流电压可调。IR2167的其它特性包括预热时间及频率可调、点燃频率可调、运行频率可调、死区时间可调、     

LED芯片激发荧光粉合成白光照明光源显色性的控制

光通量、色温和显色性是光源的三大重要指标。半导体LED从指示、显示应用过渡到照明应用．产品的显色性控制和评价是一个新的课题。本文应用光源显色性原理分析影响产品显色性的因素，并通过相关的试验，探讨如何通过材料选型和工艺措施，控制由蓝光LED激发荧光粉合成白光LED的显色性．使之达到预定指标。     

Three-band white light from InGaN-based blue LED chip precoated with Green/red phosphors

A three-band white light-emitting diode (LED) was fabricated using an InGaN-based blue LED chip that emits 460-nm blue light, and a green phosphor SrGa/sub 2/S/sub 4/ : Eu/sup 2+/ and a red phosphor Ca/sub 1-x/Sr/sub x/S : Eu/sup 2+/ that emit 535-nm green and 615-nm red emissions, respectively, when excited by 460-nm blue light. When the white LED operated in a direct current (DC) 20 mA at room temperature, the Commission Internationale de l'Eclairage chromaticity coordinate (x, y), the color temperature Tc, and the color rendering index Ra are calculated to be (0.3236, 0.3242), 5937 K, and 92.2, respectively. The luminous efficacy of this white LED is about 15 lm/W at a DC 20 mA. With increasing DC from 5.0 to 60 mA, both the coordinates x and y of the white LED trend to increase, and consequently the Tc and the Ra increases and decreases, respectively.     

Scanning white light interferometry in quality control of single-point tape automated bonding

We report on applying a scanning white light interferometry (SWLI) for quality control of aluminum lead single-point tape automated bonding (spTAB). A spTAB process was used to connect Al leads on a thin polyimide flex to Al bond pads on a flexible Al-polyimide cable. In the experiment three different bonding process parameters, i.e. bond force, ultrasonic power, and ultrasonic treatment time were varied in order to maximize the pull force. A custom built scanning white-light interferometer was used to measure the bond height in order to correlate this parameter with the tensile bond force. This force was obtained in a destructive way by a consecutive pull test. All bonds with a height within (7.22 ± 1.80 μm), possessed a tensile strength exceeding 85 mN. This was verified by a separate validation measurement where the pull force of bonds complying with the height requirement was recorded. Based on the 3D observations the conditions for an acceptable bond quality were revisited and refined.     

非相干单色光和白光散斑照相

许多文献阐述了白光散斑技术的理论和实验,但是散射体本身的性质缺少定量的描述,白光是复色光这一物理特性没有得到足够的重视.本文把散斑看成一系列随机空间频谱的迭加,建立了数学模型.并从单色非相于光散斑入手,把得出的结论再推广到白光散斑.二、非相干单色光散斑成像散斑记录系统见图1(图示为透射式,反射式的讨论相同).用非相干单色光照明散射体,与文献     

有机白光LED

有机白光LED主要有电致发光与光致发光两类。电致发光的主要机理有:量子阱发光、激基复合物发光和能量转移。人们对有机电致发光白光LED研究较多,不久将有产品问世;而对光致发光研究较少。与电致发光相比,光致发光造价更小,其荧光量子效率或许比电致发光更高。有机白光LED制备工艺简单、成本低功耗小,具有巨大的应用价值及潜在的市场。对发光显示技术,有机白光LED代表了一条“便宜”经济的路径。综述了有机白光LED的机理及发展现状。     

Hollow-cathode-type CW white light laser

A stable CW white laser light consisting of red (6360 Å, 6355 Å), green (5378 Å, 5338 Å), and blue (4416 Å) line spectra emitted from Cd ions has been obtained with an improved flute-type hollow-cathode He-Cd⁺laser tube and a broad-band optical cavity. The typical output-power level was about 10 mW, discharge conditions being 250 V and 0.6 A.     

基于大功率白光LED的可见光通信

该设计是基于STM32的大功率白光LED可见光通信系统,白光从发送到接收传输距离最高可达5 m。可传输频率为300 Hz~8 k Hz的模拟信号及高保真音频,波特率可达1.6 Mb/s,输出信号在示波器上无明显失真。该系统具备双信道通信,两路信道同时均可传输300 Hz~8 k Hz的模拟信号。由从站LCD12864液晶显示当前单信道通信或双信道通信。模拟信号经传输后在示波器上显示无明显失真。模拟信号为8倍采样,音频为6倍采样,采样信号经上拉放大后由12位A/D转换器采样,经过△压缩后由主站通过白光LED发射。接收站通过光电接收管接收信号后经解码、D/A转换,转换为模拟信号,模拟信号经滤波放大后输出至示波器或音频放大器。     

Life of LED-based white light sources

Even though light-emitting diodes (LEDs) may have a very long life, poorly designed LED lighting systems can experience a short life. Because heat at the p-n-junction is one of the main factors that affect the life of the LED, by knowing the relationship between life and heat, LED system manufacturers can design and build long-lasting systems. In this study, several white LEDs from the same manufacturer were subjected to life tests at different ambient temperatures. The exponential decay of light output as a function of time provided a convenient method to rapidly estimate life by data extrapolation. The life of these LEDs decreases in an exponential manner with increasing temperature. In a second experiment, several high-power white LEDs from different manufacturers were life-tested under similar conditions. Results show that the different products have significantly different life values.     

Acousto-optic spectrum analysis using white light

Modern high-speed wideband acousto-optic spectrum analysers for radar treat warning receivers invariably employ laser illumination. Here the authors propose and demonstrate a novel design of spectrum analyser which employs white light illumination, and which offers improved fidelity by reducing the levels of the acoustically-generated third-order intermodulation products, and a variety of other spurious effects     

消磁器确保所有磁介质擦除干净

马达控制应用在家用电器、健康医疗、电动工具、玩具等我们日常生活的方方面面，使用通用单片机进行马达控制是最常用的方法。但是日前，专注于8位微控制器的ZiLOG公司推出了马达专用控制器Z8Encore!MC系列产品。“虽然普通的单片机也可以控制马达，但效果不是很好，因为它们速度慢，而且造成很多资源的浪费，并且需要很多软件的配合，而我们此次推出的马达控制专用芯片是将马达控制需要的各种特性和功能提取出来，集成到芯片中，用硬件的方式实现了以前需要编写很多软件程序才能实现的功能。对于广大用户来说，这是一个具有里程碑意义的新产品。”ZiLOG公司中国区首席代表董伯明说。