PLC和变频器在电梯电气系统改造的应用

通过应用可编程序控制器和变频器改造客货电梯涡流制动器调速的交流调速系统和继电器-接触器控制电气系统的实例,给出改造中电器的硬件选择和主要控制环节的程序设计思路.改造后的电梯运行稳定,检修方便,节能效果明显.     

存在扰动情况下一类混沌系统的同步

根据一类混沌系统的结构和Lyapunov稳定性理论，讨论一类混沌系统在有参数和外部扰动情况下的同步问题．在驱动系统参数已知和未知两种不同的情况下，分别设计了适当的控制器以及参数自适应律实现了一类混沌系统的同步．以Arneod。系统为例进行了数值仿真，结果表明这些控制器及参数自适应律是有效的和可行的．     

一种新型信息化设备核心控制器的设计与实现

采用嵌入式网络软硬件技术,构造出一种市场前景看好的新型信息化设备核心控制器。介绍了该控制器的软硬体结构,并给出该控制器在信息空调上的实验结果。该控制器可广泛应用于新一代信息家电、智能小区网络监控系统、酒店信息化管理设备和信息化智能数控加工中心等各种信息化设备与系统,作为这些设备和系统的核心控制器。     

蓝牙技术的功能分析及应用

蓝牙技术是一种无线电通讯的新技术，具有广阔的应用前景。本介绍了蓝牙技术的基本概念，并对蓝牙基带控制器的工作方式进行了分析。     

基于MSI交通路灯的设计

通过采用数字电路对交通灯控制电路的设计,提出使交通灯控制电路用数字信号自动控制十字路口两组红、黄、绿交通灯的状态转换的新方法,指挥各种车辆和行人安全通行,实现十字路口交通管理的自动化．     

Multi-mode controller IC for soft-switched flyback converter with high efficiency over the entire load range

This paper presents a multi-mode control scheme for a soft-switched flyback converter to achieve high efficiency and excellent load regulation over the entire load range. At heavy load, critical conduction mode with valley switching （CCMVS） is employed to realize soft switching so as to reduce turn-on loss of power switch as well as conducted electromagnetic interference （EMI）. At light load, the converter operates in discontinuous conduction mode （DCM） with valley switching and adaptive off-time control （AOT） to limit the switching frequency range and maintain load regulation. At extremely light load or in standby mode, burst mode operation is adopted to provide low power consumption through reducing both switching frequency and static power dissipation of the controller. The multi-mode control is implemented by an oscillator whose pulse duration is adjusted by output feedback. An accurate valley switching control circuit guarantees the minimum turn-on voltage drop of power switch. The prototype of the controller IC was fabricated in a 1.5-μm BiCMOS process and applied to a 310 V/20 V, 90 W flyback DC/DC converter circuitry. Experimental results showed that all expected functions were realized successfully. The flyback converter achieved a high efficiency of over 80% from full load down to 2.5 W, with the maximum reaching 88.8%, while the total power consumption in standby mode was about 300 mW.     

Swarm intelligence based classifiers

A proposed particle swarm classifier has been integrated with the concept of intelligently controlling the search process of PSO to develop an efficient swarm intelligence based classifier, which is called intelligent particle swarm classifier (IPS-classifier). This classifier is described to find the decision hyperplanes to classify patterns of different classes in the feature space. An intelligent fuzzy controller is designed to improve the performance and efficiency of the proposed classifier by adapting three important parameters of PSO (inertia weight, cognitive parameter and social parameter). Three pattern recognition problems with different feature vector dimensions are used to demonstrate the effectiveness of the introduced classifier: Iris data classification, Wine data classification and radar targets classification from backscattered signals. The experimental results show that the performance of the IPS-classifier is comparable to or better than the k-nearest neighbor (k-NN) and multi-layer perceptron (MLP) classifiers, which are two conventional classifiers.     

基于接口电路的抗干扰技术的研究

简述了传导型干扰信号和辐射型干扰信号的产生来源,重点说明了从各种渠道进入通信设备或微型机中的控制器干扰信号。阐述了针对传导干扰和辐射干扰的抗干扰措施,尤其是对接口电路的抗干扰措施作了较详细的分析。     

全数字直流调速装置在车床改造中的应用

用全数字直流调速器及PLC改进C61125A 8米车床性能,给出并分析相关的电气原理图,改造后经实践证明,车床运行故障次数降低了90%以上,因PLC输入输出有指示,使故障判断更为简易、直观。     

A new controller for the seni-active suspension system with magnetor heological dampers

A new sliding mode controller for semi-active suspension system with magnetorheological (MR) damper is presented in this paper. In the proposed sliding mode controller, a semi-active suspension based on the skyhook damper system is chosen as the reference model to be followed, and the control law is so determined that the asymptotically stable error dynamics occurs between the controlled state and the reference model state. Numerical simulations are carried out to study the performance of the new sliding mode controller. The results show that the proposed controller yields almost perfect tracking to the reference model and has a high robustness against model parameter uncertainties and disturbances.