基于VC的Profibus-DP通信系统的设计与实现

针对采用WinCC等通用软件建立Profibus—DP网络不能满足大型系统中数据处理和监视的特定需求,提出一种基于VC的Profibus．DP通信系统的设计方案。采用VC＋＋6．0编写通信程序,调用网卡CP5611驱动,Profibus-DP网络节点遵循Profibus-DP协议进行通信,实现PC机为一类主站,PLCS7—300和MM440变频器为智能从站的Profibus—DP通信系统。该系统设计已应用于大气综合计量检定装置。     

大功率充电模块并联均流策略的研究

针对大功率充电模块并联电流分配不均的问题,提出了一种基于主从模式的并联均流策略,该策略可以在强电磁干扰情况下也可以取得良好的效果。首先分析了充电模块的均流特性和电池特性,根据控制性能要求建立电压外环电流内环的双环控制结构,然后对不同充电阶段设计了相应均流策略,最后用输出功率10kW的充电模块进行了充电实验,实验结果表明提出的并联均流策略能够有效地均分模块电流,从而满足系统电流不均衡度小于5%的要求。     

双端口RAM在主从并行处理系统中的应用

本文介绍双端口ＲＡＭ的特性及使用方法，并给出了在以ＰＣ机为主机，以８０９８单片机为从机的主从式系统中，通过双端口ＲＡＭ实现高速并行通信的应用实例。     

Synchronization of nonlinear master–slave systems under input delay and slope‐restricted input nonlinearity

This article addresses the synchronization of nonlinear master–slave systems under input time‐delay and slope‐restricted input nonlinearity. The input nonlinearity is transformed into linear time‐varying parameters belonging to a known range. Using the linear parameter varying (LPV) approach, applying the information of delay range, using the triple‐integral‐based Lyapunov–Krasovskii functional and utilizing the bounds on nonlinear dynamics of the nonlinear systems, nonlinear matrix inequalities for designing a simple delay‐range‐dependent state feedback control for synchronization of the drive and response systems is derived. The proposed controller synthesis condition is transformed into an equivalent but relatively simple criterion that can be solved through a recursive linear matrix inequality based approach by application of cone complementary linearization algorithm. In contrast to the conventional adaptive approaches, the proposed approach is simple in design and implementation and is capable to synchronize nonlinear oscillators under input delays in addition to the slope‐restricted nonlinearity. Further, time‐delays are treated using an advanced delay‐range‐dependent approach, which is adequate to synchronize nonlinear systems with either higher or lower delays. Furthermore, the resultant approach is applicable to the input nonlinearity, without using any adaptation law, owing to the utilization of LPV approach. A numerical example is worked out, demonstrating effectiveness of the proposed methodology in synchronization of two chaotic gyro systems. © 2015 Wiley Periodicals, Inc. Complexity 21: 220–233, 2016     

LIN主从节点设计与实现

LIN是一种串行通讯协议，用于实现汽车中的分布式电子系统控制。介绍了具体的LIN主从节点硬件组成和软件实现方法，同时提出若干抗干扰措施。测试证明按照这种方法设计的LIN网络能正确实现通信。     

单片机在火车站自动播音系统中的应用

介绍一种在火车站自动播音系统中用单片机构成的下位机系统。该系统可接收上位机指令工作，也可用自带键盘工作，还可手动以进行应急广播，从而保证了整个系统的可靠性，该系统已用于济南新客站。     

基于C167的PROFIBUS-DP智能从站的设计

设计了基于C167的PROFIBUS—DP总线协议的智能从站。依据系统所要实现的功能,提出了使用PRO—FIBUS—DP协议智能接口芯片SPC3和软件的实现方案。以C167与SPC3为核心设计了其软硬件系统,经调试满足了设计要求,目前已在实际工程中得到应用。     

MHP: Master‐Handoff Protocol for Fast and Energy‐Efficient Data Transfer over SPI in Wireless Sensing Systems

Serial peripheral interface (SPI) has been identified as a bottleneck in many wireless sensing systems today. SPI is used almost universally as the physical connection between the microcontroller unit (MCU) and radios, storage devices, and many types of sensors. Virtually all wireless sensor nodes today perform up to twice as many bus transactions as necessary to transfer a given piece of data, as an MCU must serve as the bus master in all transactions. To eliminate this bottleneck, we propose the master‐handoff protocol. After the MCU initiates reading from the source slave device and writing to the sink slave device, the MCU as a master becomes a slave, and either the source or the sink slave becomes the temporary master. Experiment results show that this master‐handoff technique not only cuts the data transfer time in half, but, more importantly, also enables a superlinear energy reduction.     

基于DSP的FPGA配置方法研究与实现

在数字电路中,FPGA＋DSP的系统结构应用日益广泛。为了减小此种结构的体积和降低成本,对FPGA采用了被动并行的配置方式。上电后,DSP首先完成自身程序的加载,之后充当配置FPGA的主处理器,从FLASH芯片中读取FPGA程序,按照配置时序完成FPGA的程序加载。在硬件设计上,创新性地采用了DSP,FPGA,FLASH共用数据总线的方式,当DSP从FLASH芯片中读取FPGA程序时,FPGA可以直接抓取出现在总线上数据来完成加载。实践证明,此种配置方法结构简洁,工作稳定,在一定程度上实现了小型化和低成本。     

改善Client/Server系统性能的数据复制

在Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ体系结构中，性能关系系统实秀性的重要问题，合理的数据复制可以分散操作过程，提高系统对服务请响应速度，系统的可靠性和可用性，在开发实践的基础上，本文讨论了内／外存数据复制和主／辅数据复制的实现。