TB6539N/F三相正弦波PWM无刷直流电动机控制器芯片

TB6539N／F是TOSHIBA新推出的三相全波无刷直流电动机正弦波控制芯片，它只需使用三个霍尔位置传感器即可按方波方式启动，并产生三相正弦波PWM电压信号，以实现无刷直流电动机的正弦波模式驱动，从而使无刷直流电动机运行在低振动和低噪声状态。     

基于IRMCF341的无位置传感器电动汽车控制器设计

介绍了一种基于同步电机无位置传感器的大功率电动汽车控制器的设计方案.硬件上,系统以国际整流公司的电机专用控制芯片IRMCF341为基础,采用以IR21864为驱动芯片的三个半桥的驱动方式来驱动电机的三相输出.在控制算法上,采用了磁链估计算法实现电机无传感器控制、三段式低速启动策略启动电机.此外,由于本系统的输出功率很大,达到了1～4 kW ,很难找到符合要求的功率模块,所以采用了以IRFP4321为分立元件组成逆变器的控制方式来达到功率输出的要求.实验结果表明,该系统可在电机调速范围内进行高精度的速度和磁链估计,具有良好的动静态性能.     

基于约束总体最小二乘的单站DOA/TDOA联合误差校正与定位算法

多基外辐射源雷达定位系统受系统偏差影响较大。该文针对多基外辐射源雷达到达角度(DOA)和到达时差(TDOA)联合定位系统,提出一种基于约束总体最小二乘(CTLS)的无源定位和误差校正算法。首先引入辅助变量,将DOA和TDOA非线性观测方程进行线性化处理。考虑伪线性化后定位方程中噪声矩阵各分量统计相关特性,将无源定位与误差校正联合优化问题建立为CTLS模型,并采用牛顿迭代方法对模型求解。在此基础上,考虑辅助变量与目标位置的关联性,设计关联最小二乘算法改进目标位置估计值,采用后验迭代方法进一步提高系统偏差估计精度。最后推导了算法的理论误差。仿真结果表明:该算法能够有效地估计目标位置和系统偏差。     

基于瞬时无功理论的不对称负荷SVC装置研究

针对电力系统日益增多的三相不对称负荷所造成的电网功率因数低、电压波形畸变等问题,本文以平衡化原理与瞬时无功理论为理论支撑,提出一种静止无功补偿装置(Static Var Compensator)补偿导纳新算法。该算法通过对负荷电流有功分量和无功分量的解耦,利用提取出的无功分量计算理想补偿导纳,相比传统算法检测更为简便,且不受谐波分量影响。在Matlab/Simulink环境下建立TCR+FC型SVC模型,通过对三相不对称负荷的仿真,证明了所提算法的正确与可行,也验证了SVC装置对平衡三相不对称网络的有效性。     

基于联合TDOA/FDOA的单站无源相干定位CWLS算法

针对利用单站实现对运动目标位置和速度的估计精度不够理想的问题,提出了一种基于联合TDOA/FDOA的单站无源相干定位(PCL)约束加权最小二乘(CWLS)算法。首先根据运动目标、观测接收站与机会照射源三者之间构建的联合TDOA/FDOA方程,建立伪线性方程并将其线性化,然后根据目标到观测接收站的距离与目标位置之间的函数约束关系,建立为CWLS定位模型,并采用迭代方法进行求解。仿真实验和结果分析表明,在存在测量误差的情况下,该算法仍然能够逼近克拉美罗界(CRLB)。     

基于频率位置多项式的稀疏混叠频谱快速恢复算法

论文提出一种基于频率位置多项式的稀疏混叠频谱快速恢复算法。该算法使用不同延时的多通道欠采样得到的信号混叠频谱,通过建立频率位置多项式,快速定位非零频点,并有效地将非线性的频谱恢复问题转换成一系列线性方程组的求解问题。该算法的计算速度相对国外同类算法(BigBand)有显著提高,并且实验结果表明该算法具有更低的频谱恢复错误率。     

基于自组织可增长映射的移动机器人仿生定位算法研究

为提高移动机器人在同步定位和地图构建(SLAM)中的定位精度,该文提出一种基于自组织可增长映射 (GSOM)的仿生定位算法。该方法将位置细胞的激活特性和神经网络输出层神经元建立响应连接,通过GSOM神经网络构建空间的拓扑地图,利用感知距离信息实现位置细胞的激活响应从而估计机器人位置,以此还原机器人的运行路径。实验结果表明细胞间隔R对定位精度有较大影响,选取合适的细胞间隔能有效地减少神经网络的学习时间,提高定位精度,该文算法平均误差在0.153 m以内,定位精度达到90.243%,均优于原有算法。经验证该文算法建立的模型能够实现机器人的空间位置表征,提高了机器人在实验场景下的定位精度,表现出良好的位置估计性能。     

一种三相BLDC无位置传感器控制板卡设计

本文采用MC9S08MP16来设计无位置传感器反馈检测三相无刷直流(BLDC)梯形电机速度闭环控制来设计了一款工业级控制板卡。该设计可以针对消费电子、汽车和工业应用。这个经济高效方案充分考虑到了飞思卡尔MC9S08MP16器件的专用电机控制特性。     

3G移动网络中逆向GLR故障恢复算法及分析

在3G网络中,当漫游用户在网关位置寄存器(GLR)中的位置信息不正确时,其位置查询将失败,此时将严重恶化系统性能,而传统的位置恢复算法需占用大量长途电路资源。为减少GLR位置恢复过程中对长途电路资源的占有及缩短GLR故障恢复时延,本文提出了一种新的算法逆向GLR故障恢复算法。该算法充分利用用户在访问位置寄存器(VLR)中的用户信息,从而避免在恢复过程中GLR和归属位置寄存器(HLR)的长途信令开销。通过对算法的性能作分析,证明所提出的算法是可行的。     

基于PIC16C72的电力三相不对称负载无功补偿算法的实现

用PICl6C72单片机设计了电力三相不对称负载的功率因数补偿控制系统，提出了补偿电容容量的优选算法及负载性质判定算法。该系统可用于380V、50Hz的三相电力系统，与无功功率补偿屏配套使用。他可根据电网无功功率的大小与性质启动控制补偿屏中的电容器投入或切断，从而减少电网的无功消耗，改善供电质量并节约电能。     

Amorphization during mechanical grinding of Bi-Pb-Sr-Ca-Cu-O ceramic superconductors

The report describes the amorphization occurring during mechanical grinding of a mixture of Bi-HTSC 2223 and 2212 phases. It is shown that the visually determined grain size and the actual crystal size diminish upon grinding. Noticeable amorphization occurs even after only 30 min of grinding. Furthermore, different crystal planes exhibit variable sensitivity towards the amorphization process and the high T_c-phase is more easily affected by this phenomenon than the low T_c-phase in the Bi-system. Identical results were obtained whether the starting composition of the spray dried powder was 2223 or 2234.     

一种用于DSCRL绝热电路的新型功率时钟

提出了一种用于DSCRL(双摆幅电荷恢复逻辑)绝热电路的新型四相功率时钟,该功率时钟采用了非对称的方法来优化其时序,比已提出的采用对称技术来优化时序的六相功率时钟更简洁.这种新型的功率时钟用于DSCRL绝热电路后,该电路仍然保持了其能量恢复的高效性,同时还降低了电路设计的复杂性,这一结论已被文中的HSPICE 模拟结果证明.     

一种用于DSCRL绝热电路的新型功率时钟

提出了一种用于DSCRL(双摆幅电荷恢复逻辑)绝热电路的新型四相功率时钟,该功率时钟采用了非对称的方法来优化其时序,比已提出的采用对称技术来优化时序的六相功率时钟更简洁.这种新型的功率时钟用于DSCRL绝热电路后,该电路仍然保持了其能量恢复的高效性,同时还降低了电路设计的复杂性,这一结论已被文中的HSPICE 模拟结果证明.     

直流无刷电机驱动芯片LB11820M的原理及应用

LB11820M是日本SANYO(三洋)公司开发的三相直流无刷电机驱动芯片。它具备开环三相电机控制所需的全部有效功能，并且具有比较完善的保护电路。文中介绍了LB11820M的特点、功能和工作原理，给出了其典型应用电路。     

三相单管零电流关断功率因数校正器的研究

介绍仅用一个主开关管及一个辅助开关提高设备的输入侧三相交流功率因数的零电流关断（ＺＣＳ）升压型变换器的基本电路,说明升压电感电流工作在不连续状态的必要性。采用三相整流电压的６次谐波前馈（注入）,以减小三相电源的５次庇波电流。减小主开关管关断损耗采用了零电流关断电路。     

Design Strategy for Step-Up Charge Pumps With Variable Integer Conversion Ratios

Method in identifying all possible configurations of 2-phase charge pumps giving an integer conversion ratio with a fixed number of flying capacitors is presented. A systematic strategy is proposed to design an integrated charge pump as an example with a variable gain of 6times and 7times in a standard 0.35-mum CMOS process using only 4 flying capacitors. Conduction loss is considered and minimized. Measurement results verified the validity of the design methodology     

Development of a New Permanent-Magnet BLDC Generator Using 12-Phase Half-Wave Rectifier

Six-phase double-star armature windings of a synchronous generator are essentially equivalent to 12-phase symmetrical windings displaced in turn by 30$^{circ}$. This paper proposes and implements a new permanent-magnet brushless dc (BLDC) generator using 12-phase half-wave rectifier. Characteristic of output voltage is analyzed according to the star graph of slot potential, and the design constraints of armature windings are provided. Simulation models of 12-phase synchronous generator with half-wave rectifier and double-star synchronous generator with bridge rectifier are established separately. Field-circuit-coupled analysis is accomplished, and conducted modes of rectified diodes and output characteristic are obtained. It is shown that the current stress of diodes in 12-phase rectification system is less than half of that in double-star rectification system, and the output voltage fluctuation between the two different rectification systems is similar. Experimental results on prototype machine, which agree well with the simulation analysis, also verify the feature of the proposed BLDC generator system.      

Amplified spontaneous emission in α-phase and β-phase polyfluorene waveguides

Amplified spontaneous emission (ASE) of α- and β-phase poly(9,9-dioctylfluorene) (F8) based waveguides has been studied and ASE wavelengths have been determined as 451 nm and 468 nm, respectively. β-phase waveguides are found to be with higher net gain and lower light propagation loss as compared to α-phase waveguides. Such important improvement of ASE properties, making β-phase waveguides superior over α-phase counterparts is shown to be achieved at the expense of higher refractive index and photoluminescence quantum efficiency of β-phase F8.     

Performance analysis of pseudo 4-phase dual-rail asynchronous protocol

This article presents the performance analysis of novel pseudo 4-phase dual-rail protocol with self-reset and multiple-reset logic for high speed asynchronous applications. The self-reset logic eliminates the need for separate empty phase and hence reduces the number of transitions at the input and the output. The multiple-reset logic reduces the reset phase and hence increases the throughput. The performance of the pseudo 4-phase dual-rail protocol is compared with the existing 4-phase dual-rail protocol by implementing 8-bit and 16-bit asynchronously pipelined carry look ahead adders (CLA) in 0.35?µm technology. The time period decreases up to 32.58% and 35.93% respectively, the reset phase reduces up to 66.39% and 76.18%, respectively, and the operating frequency increases up to 48.4% and 56.2%, respectively, for 8- and 16-bit CLA adders with the pseudo 4-phase dual-rail protocol compared to the conventional 4-phase dual-rail protocol at the cost of increase in area of 8.8% and 3.3%, respectively. The delay-power product in ns-mW of the 8- and 16-bit CLAs is reduced at the maximum of 11.29% and 23.74%, respectively, with the pseudo 4-phase dual-rail protocol compared to the conventional 4-phase dual-rail protocol. The pseudo 4-phase dual-rail protocol is suitable for interfacing with synchronous environments.     

Active filters and oscillators using simulated inductance

A new circuit for simulating an inductor is described. It uses standard voltage amplifiers and RC networks and is particularly suitable for use in high-pass filters and as a simple 2-phase oscillator circuit.