电流控制PWM开关电源

介绍电流控制PWM开关电源的基本原理，并将其与电压控制PWM开关电源进行比较，指出了电流控制PWM开关电源的优点。最后给出了一个实用的电流控制PWM开关电源进行比较，指出了电流控制PWM开关电源的优点，最后给出了一个实用的电流控制PWM开关电源电路。     

平均电流模式PWM降压开关电源设计探讨

在通讯和电子等多个领域,PWM开关电源得到了广泛的应用。而随着电子产品对电源性能要求的提高,还要使用平均电流控制模式对电源进行高精度控制。因此,本文在分析开关电源控制方式的基础上,对平均电流模式PWM降压开关电源的设计问题展开了探讨,从而为关注这一话题的人们提供参考。     

开关电源动态负载的探讨

前言 同步降压型开关电源具有输出电流大、效率高等优点,适合电池供电、注重效率的笔记本电脑等产品。一般笔记本电脑各部分组件,如CPU、芯片组、绘图芯片、内存、硬盘、光驱等,对电源电压/电流的要求不同。因此笔记本电脑内需要多路降压型DC/DC转换器产生不同的输出电压/电流,这些DC/DC转换器大多采用脉冲宽度调制(PWM)。     

并联均流高频开关电源的研究

随着分布式电源系统的发展，开关电源并联技术的重要性日益增加。文中介绍了一种新型高频开关电源及220V／10A整流模块的实现方案。其中整流模块采用高可靠性电流型PWM整流器及全桥变换电路来分别实现三相功率因数校正和DC／DC变换，并在模块间采用最大电流自动均流法实现自主均流。     

脉冲跨周期调制开关电源的特性研究

对脉冲跨周期调制(PSM)开关电源的特性进行了研究。这类开关电源的效率比常规的脉冲宽度调制(PWM)高，且基本上与负载无关；通过状态机对负载进行离散侦测以及电流极限模糊控制模式，提高了电源的响应度；通过频率抖劝，降低了开关电源的电磁干扰影响。这类开关电源集远程遥控关断、外部可编程、智能保护、同步等功能于一体，隐现了功率系统级发展的一种途径。     

CMOS求和比较器在PWM开关电源控制中的应用

介绍了一种用CMOS求和比较器代替传统的PWM电流控制电路中误差放大器的开关电源控制技术，该技术可以使原来复杂的、缺乏自适应能力的系统变得简洁，并且降低了成本，有利于系统集成。     

一种基于UC2844的单端反激式高频稳压开关电源

本文设计了一种以UC2844电流型PWM控制器控制,多路输出的单端反激式开关电源。根据UC2844的电流控制模式给出以单端反激式拓扑结构和峰值电流PWM技术为基础的设计方法,通过测试得到的信号波形说明了本方法设计出的开关电源可以减小纹波和提高电源效率,保证电压的稳定输出。     

低静态电流的汽车降压转换器

Maxim推出40V输入、DualMode降压转换器MAX5096／MAX5097。负载较大时。转换器工作于高效PWM降压开关模式。待机期间，系统微控制器可在线驱动LDO或／BUCK输入引脚．强制MAX5096／MAXS097进入LDO模式，从而可以降低静态电流。     

基于电流型PWM控制器的隔离单端反激式开关电源

以DC／DC变换器及UC3842型电流型PWM控制器为例，着重论述一种小功率开关电源的基本电路结构及其工作原理。     

开关电源驱动信号斜率补偿技术的研究

对电流型PWM控制器的扰动来源进行分析，给出了解决办法和几种比较实用的斜率补偿电路，如控制电压补偿方式和电流补偿方式，对改善开关电源驱动信号稳定性有很好的效果。最后给出了一种电流环补偿电路实例予以验证。     

基于红外热像仪的海上油田安防系统设计

海上油田安防系统中的红外热像仪在有雾天气及夜间都可以对海底管缆区域进行有效的监视,具有全天候监视的优势.对基于红外热像仪的海上油田安防系统进行了设计,给出了系统的设备组成.分别对单个红外热像仪系统和红外热像仪与AIS相结合的联合系统进行了设计,并对联合系统的显控软件进行了设计.     

Error Analysis of the Anti-Causal Realization of Periodic Inverse Systems

A causal realization of an inverse system can be unstable, and an anti-causal realization is used to deal with this problem to provide a numerically stable procedure to realize the inverse system and compute its input signal. In this paper, we consider the anti-causal realization of the inverse of discrete-time linear periodic systems obtained by an outer-inner factorization approach. It presents an analysis and understanding of the inverse system error caused by different parts of the system components. The analysis shows that the inverse system error due to the mismatching of the system initial state in the anti-causal inverse system is inevitable in practical computations.     

基于多活性代理的“低慢小”目标探测系统浅析

多活性代理方法是一种先进的复杂信息系统分析构建方法,"低慢小"目标探测系统是对低空慢速小目标进行探测、识别、处理的综合系统。对多活性代理进行了介绍,运用多活性代理方法简单分析了"低慢小"目标探测系统的功能和结构组成,对提高系统设计品质和效能具有明显作用。     

Self-Sensing Actuation With Adaptive Control in Applications With Switching Trajectory

This paper presents the application of self-sensing actuation (SSA) to facilitate the implementation of piezoelectric actuator in an intelligent mechatronic system. SSA is a technique to employ smart materials, such as piezoelectric materials, simultaneously as a sensor and an actuator; thereby increasing the level of integration of the system. The piezoelectric actuator is equipped with an exclusive adaptive controller amidst its nonlinearities and system's disturbance. The application area to be discussed is a microdispensing system, which is an example of a micromanufacturing process, combining a fluidic system and a positioning system.     

配置环行器的雷达馈线系统驻波特性研究

电压驻波比是雷达馈线系统的重要指标。采用环行器作为双工器的复杂结构雷达馈线系统电压驻波比的准确估算往往非常困难。提出了雷达馈线系统电压驻波比的一种工程分析方法,首先建立了基于环行器作为收发双工功能的雷达馈线系统链路模型,然后基于概率统计方法和三端口网络散射参数特性导出了馈线系统电压驻波比的计算公式。最后针对环行器两种负载状态,通过一个实例计算了馈线系统的反射系数和电压驻波比,给出了具体计算结果,并对其进行了仿真验证。     

Wavelet neural network control for induction motor drive using sliding-mode design technique

This paper addresses an adaptive observation system and a wavelet-neural-network (WNN) control system for achieving the favorable decoupling control and high-precision position tracking performance of an induction motor (IM) drive. First, an adaptive observation system with an inverse rotor time-constant observer is derived on the basis of model reference adaptive system theory to preserve the decoupling control characteristic of an indirect field-oriented IM drive. The adaptive observation system is implemented using a digital signal processor with a high sampling rate to make it possible to achieve good dynamics. Moreover, a WNN control system is developed via the principle of sliding-mode control to increase the robustness of the indirect field-oriented IM drive with the adaptive observation system for high-performance applications. In the WNN control system, a WNN is utilized to predict the uncertain system dynamics online to relax the requirement of uncertainty bound in the design of a traditional sliding-mode controller. In addition, the effectiveness of the proposed observation and control systems is verified by simulated and experimental results.     

嵌入式红外目标识别跟踪系统的研究

本文研究的嵌入式红外目标处理系统基于ATR技术,它可以用来实现对动态红外目标的自动识别与跟踪。根据功能的要求,设计了一个包括红外信号采集处理模块、自动目标识别跟踪模块和嵌入式主控模块三部分的嵌入式处理系统。该系统可高速实时地处理动态目标,具有友好的人机交互界面;对提高目标识别的速度,实现系统的小型化有着积极的意义。文章重点介绍了系统各功能模块软硬件的具体实现。     

Blind and complete modeling of linear systems using third order cumulants

This paper presents a novel approach to structure determination of linear systems along with the choice of system orders and parameters.AutoRegressive (AR),Moving Average (MA) or AutoRegressive-Moving Average (ARMA) model structure can be extracted blindly from the Third Order Cumulants (TOC) of the system output measurements,where the unknown system is driven by an unobservable stationary independent identically distributed (i.i.d.) non-Gaussian signal.By means of the system order recursion,whether the system has an AR structure or has AR part of an ARMA structure is firstly investigated.MA features in the TOC domain is then applied as a threshold to decide if the system is an MA model or has MA part of an ARMA model.Numerical simulations illustrate the generality of the proposed blind structure identification methodology that may serve as a guideline for blind linear system modeling.     

Statistical multiplexing with a variable number of servers

A statistical multiplexing system that varies dynamically between a single-server system and an m-server system is analyzed. It is shown that the system has the same mean response time as a single-server system and that it betters the mean waiting time of an m-server system.     

MATLAB电力系统仿真技术在水利电气自动化中的应用

水利系统中,电气自动化设备是其重要组成部分.而在进行电气系统设计时,往往需要知晓电力系统潮流、系统稳定性等重要性能,而有时又要对系统进行故障预测、诊断与分析,继电保护系统等的计算与分析,因此针对其电气自动化系统进行有效的仿真分析工具,对深入研究和设计水利电气自动化系统起到了积极的推动工作用.MATLAB电力系统仿真技术...