一种基于Link606带无源PFC电路的开关电源

本文介绍一种带无源PFC的开关电源的实现方法,并将其与不带PFC功能的传统开关电源进行比较,阐述其工作原理,进一步从细节上分析其实现PFC作用的方式。选择PI公司的LINK606系列芯片,与该无源PFC电路组合,设计了一款开关电源,使该电源输出恒流。本文还给出了相关原理图、波形和实验数据。     

基于TS201的实时图像处理系统链路口通信设计

在图像处理系统中,为了实时获取数据图像及解决多DSP之间的数据传输,在以FPGA加3个DSP为核心模块的硬件平台上,论文通过对DSP链路口发送、接收时序设计以及对存储器直接访问控制块、链路口接收控制寄存器、发送控制寄存器进行编程设置,实现了以Analog Device公司的DSP(TS201)为核心器件的链路口图像接收技术及链路口数据传输技术。     

Cooperative Strategy for a Wheelchair and a Robot to Climb and Descend a Step

This paper discusses a cooperative strategy that enables a wheelchair and a wheeled robot to climb and descend a step. In this method, not only does the robot assist the wheelchair user, but also the user assists the robot to overcome the step. The research indicates the feasibility of this new cooperative strategy between a physically disabled person and a personal robot that is not designed for high-level performance. The two vehicles (the wheelchair and the wheeled robot) are connected by a simple link mechanism, the two connecting positions of which are free joints. This method is especially affected by the link positions. A numerical calculation clarifies the combinations of the two link positions to avoid a collision between each vehicle and to overcome a step at the same time. The result of the simulations indicate that it is necessary to change the link positions to climb and descend a step safely. The experimental results show that this method is effective.     

LINK11_SLEW信号的非协同解调

根据LINK11_SLEW信号的波形协议和帧结构,先对复杂信道下的LINK11_SLEW信号进行一次模拟解调,再采用相关同步算法、重构前导序列测频算法、平均自适应滤波的信道均衡( AFA)算法和最佳采样点鉴相解扰算法进行二次解调,理论推导和计算仿真表明,复杂信道下采用常规解调方式无法有效解调的 LINK11_SLEW 信号,采用新算法解调星座图在10符号之内达到收敛,在Eb/N0高于12 dB的情况下,解调误码率小于10-3。     

PLC在娄江污水处理系统中的应用

文章介绍了娄江污水处理厂自控系统的配置和功能,阐述了其系统网络结构特点——由计算机、PLC、现场总线、现场在线仪表组成多级的、开放的、模块化的、实时多任务的、集散型的、可扩展的数据采集和监控系统。     

基于EPON+MoCA的CATV高速接入网方案设计

阐述了MoCA技术标准c.LINK的技术特点与优势.针对传统广电双向改造方案所提供的10带宽难以满足用户高清电视、高速下载需求问题,以MoCA技术多频道高速带宽优势为基点设计了基于E-PON+MoCA技术的有线电视高速宽带接入网方案.     

基于HOST LINK协议的FINS通信

上位机与欧姆龙PLC串行通信时,通常使用HOST LINK协议,但HOST LINK协议只能通信4位及4位以下地址数据。如果需要通信4位以上地址数据,可使用FINS协议。FINS是欧姆龙公司开发的用于工业自动化的串口通信和网络通信的协议。介绍了FINS用于串口通信时的数据帧格式,并在Visual Basic的可视化开发环境下,利用MSComm控件开发了具体的通信应用,实现了上位机与PLC内存高地址之间的数据通信。     

利用No.7监测仪表处理几个问题

介绍利用No .7信令监测系统监测交换局的No .7信令 ,及通过呼损分析功能处理一些故障的方法。     

ATM中QFCP的研究

流量控制协会在１９９５年７月通过关于ＡＴＭ的流量控制协议。本文研究了该协议的整体结构，工作原理，及其它所支持的ＡＢＲ业务的特性。     

Development of a control system for an omni-directional vehicle with step-climbing ability

This paper proposes a control method for wheels to pass over rough terrain. In our previous work, we have developed a holonomic mobile mechanism capable of running over steps. The mechanism realizes omni-directional motion on a flat floor and passes over uneven ground in forward and backward directions. The vehicle has seven special wheels with cylindrical free rollers and two passive body axes that can adapt to rough terrain. Seven actuators are located in each wheel; therefore, our vehicle system requires the rotation velocity of each wheel to be coordinated. However, it is difficult to keep such coordination among the wheels — as the vehicle passes over the step, the load applied to the wheel tends to heavy and irregular. Therefore, we propose a new control system for synchronization among the wheels. In this paper, the following two topics are discussed: the load adjustment so as not to exceed the maximum torque of the actuator in some of the wheels and keeping the balance of rotation velocity among the wheels. Our novel control method adjusts the output value by referring to the state of the other wheels. The performance of our system is investigated by means of computer simulations and experiments using our prototype vehicle.