安森美半导体低压便携及中等电压LED通用照明方案

介绍了安森美半导体为高能效的低压便携式及中压LED通用照明提供优化的驱动器方案。     

All ink-jet printed low-voltage organic field-effect transistors on flexible substrate

In this work, all ink-jet printed (IJP) low-voltage organic field-effect transistors (OFETs) on flexible substrate are reported. The OFETs use IJP silver (Ag) for source/drain/gate electrodes, poly(4-vinylphenol) (PVP) for gate dielectric, 6,13-bis(triisopropylsilylethynyl)-pentacene (TIPS-pentacene) blended with polystyrene (PS) as the semiconducting layer and CYTOP for encapsulation layer. All the printing processes were carried out in ambient air environment using a single laboratory ink-jet printer Dimatix DMP-2831. The all IJP device presents state-of-the-art performance with low operation voltage down to 3 V, small subthreshold swing (SS) of 0.155 V/decade, mobility of 0.26 cm² V⁻¹s⁻¹, threshold voltage (V_th) of −0.17 V and on/off ratio of 3.1 × 10⁵, along with a yield of 62.5%. Through interface engineering and proper process optimization, this work demonstrates a promising low-voltage all IJP device platform for low-cost flexible printed electronics.     

低压法调参数总结

采用低压法调参数,在低压电器试验中,用于大电流试验参数的粗调是很有实用价值的。     

Testing of low-voltage ride through capability compliance of wind turbines – a review

The increasing grid integration of wind power has led to the compulsory requirement of low-voltage ride through capability (LVRT) in wind turbines. Grid codes for LVRT capability of wind turbines are proposed in all major wind-energy-producing countries. The testing of LVRT capability compliance of the wind generators as per the specified grid codes during different fault conditions is essential to ensure its reliability. The testing process is generally done by the manufacturers and crucial for certification as per the IEC 61400-21 international standard for measurement of power quality characteristics of wind turbines. This review analyses the various testing tools under the software- and hardware-based categories. The review helps in understanding the present challenges in implementation of wind turbines, to alleviate the difficulty in LVRT testing procedures.     

低压电动机控制回路设计应注意的几个问题

低压电动机是工企中应用较多的电气设备,其控制回路的设计直接影响到设备的正常运行。根据多年的设计实践经验,总结出在低压电动机控制回路的设计中应注意的几个问题。     

配电网低电压治理方案动态评价方法研究

针对当前配电网低电压改造项目缺乏行之有效的动态评价方案,从项目改造的经济性和治理效果着手,同时考虑到负荷动态增长,在站-线-变-户低电压精细化评价体系的基础之上,提出了综合电压合格率,负荷-电压灵敏度、效果成本比等指标,对配电网改造项目进行动态评估。综合电压合格率用以表征区域内电压质量的水平,衡量项目改造前后低电压治理效果。负荷-电压灵敏度表征区域内负荷变化对电压质量的影响,建立区域电压偏差与负荷之间关系,对项目改造后的电压质量进行预估。效果成本比作为项目改造的动态评价指标,通过实例验证,证明了其有效性,为配电网低电压改造项目评估提供了理论依据。     

低压电力线宽带载波通信系统发射端物理层的实现

文章分析了载波通信的现状,以及宽带载波测量的关键因素。研究了低压电力线宽带载波通信系统物理层发射端的结构,该物理层发射端由信道编码、星座映射、IFFT、循环前缀与加窗、正交调制和加前导等模块构成,针对上述模块从算法实现的角度进行了分析研究。文章对Turbo交织模块、编码模块、IFFT模块等关键模块的FPGA实现方案进行了详细介绍和分析。该实现方案对宽带载波标准信号生成设备研发具有一定的指导意义。。     

低压电机引接电缆连接新工艺的应用

行业内低压电机引接线电缆连接一直使用传统的锡焊工艺,效率低、成本高、污染大、连接稳定性差;利用金属冷压管连接电机引接线电缆具有传统锡焊工艺无法比拟的高效、节能、无毒害和连接稳定等优点。介绍一种将金属冷压连接应用于电机引接线连接的新工艺。该工艺在解决一系列应用问题的同时对原有接线工艺流程进行优化改进,并通过性能检测,满足设计和生产需要。     

Monolithic voltage conversion in low-voltage CMOS technologies

A high-to-low switching DC-DC converter that operates at input voltages up to two times as high as the maximum voltage permitted in a low-voltage CMOS technology is proposed in this paper. The proposed circuit technique is based on a cascode bridge that maintains the steady-state voltage differences among the terminals of all of the transistors within a range imposed by a specific low-voltage CMOS technology. An efficiency of 87.8% is achieved for 3.6-0.9 V conversion assuming a 0.18 μm CMOS technology. The DC-DC converter operates at a switching frequency of 97 MHz while supplying a DC current of 250 mA to the load.     

0.4-V bulk-driven differential-difference amplifier

A new solution for an ultra-low-voltage, low-power, bulk-driven fully differential-difference amplifier (FDDA) is presented in the paper. Simulated performance of the overall FDDA for a 50 nm CMOS process and supply voltage of 0.4 V, shows dissipation power of 31.8 μW, the open loop voltage gain of 58.6 dB and the gain-bandwidth product (GBW) of 2.3 MHz for a 20 pF load capacitance. Despite the very low supply voltage, the FDDA exhibits rail-to-rail input/output swing. The circuit performance has also been tested in two applications; the differential voltage follower and the second-order band-pass filter, showing satisfactory accuracy and dynamic range.