多路输入大功率LED智能驱动电路系统设计

采用单片机智能控制以实现由风、光、市电多路输入的大功率LED驱动电路设计。其中,风光发电互补系统实现了不同工作情况下的最大功率点跟踪控制策略,并以模拟的风光能源展示发电特性,完善了风光互补措施。蓄电池充电控制方案分段优化充电过程,以智能化操控实现能源的最大利用。从而实现了驱动电路整体最优性能的设计。     

A Novel Single Stage AC–DC Self-Oscillating Series-Parallel Resonant Converter

This paper presents an improved self-sustained oscillating controller suitable for the single stage single phase power factor correction circuits. It has a modified active controller, which improves the performance from no-load up to full-load. The steady state characteristics are developed and a design example is given in detail. The proposed controller allows zero voltage switching at any loading condition with a reasonable power factor that satisfies the IEC 61000-3-2 standards together with a promising efficiency. Analytical, simulation, and experimental results verify the achievement the design specifications     

SECM微纳米定位建模及控制器设计

为适应扫描电化学显微镜(SECM)常规应用中100nm左右的微定位精度需求,同时降低其微定位控制器的成本,在分析SECM压电工作台运动定位数学模型的基础上,结合SECM实际应用中的特点,将压电工作台数学模型进行了合理的简化,并在此基础上设计了算法简单且易于实现的开环微定位控制器。以CHI900B型扫描电化学显微镜的三维压电工作台为实验对象进行建模和控制器设计,实验结果表明,压电工作台运动定位平均跟踪误差和最大跟踪误差分别为0.093、0.115μm,误差约0.1μm,可满足SECM常规应用中的微定位精度需求。建模过程和控制器设计简单易行且无须额外的微定位传感器,适于SECM的常规应用。     

A novel yield optimization technique for digital CMOS circuits design by means of process parameters run-time estimation and body bias active control

This work presents a novel approach to optimize digital integrated circuits yield referring to speed, dynamic power and leakage power constraints. The method is based on process parameter estimation circuits and active control of body bias performed by an on-chip digital controller. The associated design flow allows us to quantitatively predict the impact of the method on the expected yield in a specific design. We present the architecture scheme, the theoretical foundation, the estimation circuits used, and two application case studies, referring to an industrial 0.13-/spl mu/m CMOS process data. The approach results to be remarkably effective at high operating temperature. In the presented case study, initial yields below 14% are improved to 86% by using a single controller and a single set of estimation circuits per die.     

A Model-Based Direct Power Control for Three-Phase Power Converters

The direct power control (DPC) technique has been widely used as a control strategy for three-phase power rectifiers due to its simplicity and good performance. DPC uses the instantaneous active and reactive power to control the power converter. The controller design has been proposed as a direct control with a lookup table and, in recent works, as an indirect control with an inner control loop with proportional-plus-integral controllers for the instantaneous active and reactive power errors. In this paper, a model-based DPC for three-phase power converters is designed, obtaining expressions for the input control signal, which allow the design of an adaptive control law that minimizes the errors introduced by parameter uncertainties as the smoothing inductor value or the grid frequency. A controller design process, a stability study of the system, and experimental results for a synchronous three-phase power rectifier prototype are presented to validate the proposed controller.     

A design method of the wide-area damping controller of the power system considering the communication time-delay based on an iterative identification

There must be a non-negligible communication time-delay in the transmission process of wide area information through the power system. Communication time-delay will reduce the system stability or even cause system instability, and also there exists an identification error problem in the model identification. Therefore, the identification error will make model parameters not accurate enough, and it cannot ensure the control effect of the power system time-delay damping controller. Aiming at the problem of communication time-delay and identification error in the power system, firstly, a closed-loop time-delay model of the power system is described in this paper. Secondly, a design method of iterative identification damping controller of the power system considering the time-delay (constant delay and time-varying delay) is proposed. In addition, the whole step of the proposed method and a mathematical calculation method of the exact time-delay controller model are given. Finally, the four-machine two-area system model is taken as an example in this paper. Simulation results show that the response of both angle and active power of motor can stabilize within 8 seconds. The designed controller in this paper can effectively suppress low frequency oscillation and ensure the stability of power system.     

Modeling and Control of a Novel Six-Leg Three-Phase High-Power Converter for Low Voltage Fuel Cell Applications

In this paper, an averaged model for a recently proposed novel three-phase transformer-isolated phase-shift dc–dc converter is derived. Fuel cell static and dynamic characteristics are used for the converter power stage design consideration. The controller is then designed based upon the power stage parameters and system dynamic requirements. The entire system has been designed, fabricated, and tested using a commercial 1.2-kW proton exchange membrane fuel cell. The experimental results match the simulation results fairly well on both fuel cell source dynamic and step load transient responses.     

一种四合一组合式电源控制器芯片的设计与实现

本文设计和实现了一种用在计算机主板上的新型四合一组合式电源控制器芯片,它集成了一组可编程的同步整流式降压型开关电源控制器、一组普通的降压型开关电源控制器、一组线性电源控制器和一组带片上导通器件的线性电源调整器,从而减小了主板面积和降低了成本。采用１．７μｍ ＢｉＣＭＯＳ工艺成功流水制作出该芯片,并以它为核心建立了一个适用于ＰｅｎｔｉｕｍⅢ系列计算机主板的四合一组合成电源系统。测试结果表明该电源系统     

基于PSpice的光伏并网系统仿真研究

采用DC／DC和DC／AC两级拓扑结构对光伏并网系统进行了研究和设计,采用改进的定电压跟踪法（CVT）实现最大功率点闭环跟踪,并将PWM控制器引入并网逆变中,采用三角波比较方式实现SPWM电压逆变和输出电流的波形跟踪与控制,在电压、电流内环的基础上引入功率外环以实现系统前后级功率平衡和能量管理,采用基于PSpice的光伏电池仿真模型对所设计光伏并网系统进行了仿真。仿真结果表明,基于PSpice的光伏仿真模型能够有效地模拟实际光伏并网系统的行为特征,将PSpice软件用于光伏发电系统的仿真是可行的。     

H/sup /spl infin// repetitive control of DC-AC converters in microgrids

This paper proposes a voltage controller design method for DC-AC converters supplying power to a microgrid, which is also connected to the power grid. This converter is meant to operate in conjunction with a small power generating unit. The design of the output voltage controller is based on H/sup /spl infin// and repetitive control techniques. This leads to a very low harmonic distortion of the output voltage, even in the presence of nonlinear loads and/or grid distortions. The output voltage controller contains an infinite-dimensional internal model, which enables it to reject all periodic disturbances which have the same period as the grid voltage, and whose highest frequency components are up to approximately 1.5 kHz.     

Pseudocoevolutionary genetic algorithms for power electronic circuits optimization

This correspondence presents pseudocoevolutionary genetic algorithms (GAs) for power electronic circuit (PEC) optimization. Circuit parameters are optimized through two parallel coadapted GA-based optimization processes for the power conversion stage (PCS) and feedback network (FN), respectively. Each process has tunable and untunable parametric vectors. The best candidate of the tunable vector in one process is migrated into the other process as an untunable vector through a migration controller, in which the migration strategy is adaptively controlled by a first-order projection of the maximum and minimum bounds of the fitness value in each generation. Implementation of this method is suitable for systems with parallel computation capacity, resulting in considerable improvement of the training speed. Optimization of a buck regulator for meeting requirements under large-signal changes and at steady state is illustrated. Simulation predictions are verified with experimental results.     

An Improved Single Stage Phase Shifted Control Based AC–DC PFC Converter for Wireless Applications

Recently, many researchers has more attention in a single stage AC to DC converter features and DC to DC regulator are extensively used into low power applications. When compared with the two stage conventional method over the Single stage converter has a simple design and utilize only less components. Therefore, this task has been used in this paper as a prposed work of AC–DC single stage converters combine a converter front end with DC–DC back end converter. This proposed work has been improved single stage power factor correction (PFC) converter based on phase-shifted controller for wireless Power applications. The proposed technique employed to develop the improved converter for task of an extensive series of voltage outputs with rippleless outcomes in low frequency, that shows the high essential in battery application and the PFC duty ratio restriction is eradicated. Similarly, DC–DC stage operation are designed in a related way of conventional full bridge phase shifted converter. Accordingly, the proposed technique of improved converter of this paper will achieves better efficiency compared with other conventional techniques and it has been prove more efficient for many Industrial applications, it has been discussed in result section clearly. The experimental results of proposed improved converter proves that it is potential to extend high power single stage converter with good power factor, conversion characteristics and efficiency.

     

基于鲁棒稳定的闭环激磁电源幅值回路设计

保证系统鲁棒稳定,同时满足系统性能指标要求始终是控制设计的目标。该文根据转台测角系统对激磁电源稳定性和性能指标的要求,提出了采用H优化控制理论,以鲁棒稳定为基础的闭环激磁电源幅值回路设计的方法,讨论了H控制器的求解过程。经四个转台长期使用验证该设计方法的有效性和合理性,完全满足了高精度转台的需要。     

模糊理论在数控铣床加工中的应用研究

基于对数控铣床加工过程智能优化与提高加工效率的目的,改变传统的数控铣床加工过程中加工参数一成不变情况。本文从加工过程中,人的思维逻辑作用出发,选定模糊理论作为调整加工参数的方法设计一个能够自动调整伺服电机进给速度的模糊控制器,实现伺服电机的恒功率加工,提高铣削加工效率。并结合仿真手段对模糊控制器的控制作用进行仿真分析。找到一个合适的进给速度,对模糊控制器在数控铣床实际加工中的应用提供一个参数指导。     

无线传感装置的太阳能供电系统研究

为了能够实现对安装在无缝钢轨上的无线传感装置无间断供电,详细介绍一种太阳能无间断供电系统的设计方案。供电系统以充放电控制器为核心,采用免维护铅酸蓄电池作为备用电源,实现了对无线传感装置的无间断供电系统设计。在完成系统的同时,还充分考虑了雷击影响,以及无线传感装置电压的远程监控问题,为此,增加了电池防雷模块以及GSM短信开关,保证了该系统的安全可靠性。经现场测试,蓄电池能够在阴雨天气持续作业达7天,该系统具有安全、可靠、防雷击、远程监控等特点。     

基于ARM9的中央空调网络集中控制器研究

为了提高目前中央空调的网络化控制能力,针对现有中央空调的控制方法,提出了基于ARM9处理器和Linux操作系统的中央空调网络集中控制器的设计方案,给出了基于ARM9的中央空调网络集中控制器的硬件实现方法,以及基于Linux操作系统的串行通信和网络通信的软件实现方法。该控制器处理能力强,便于外扩存储器,由于内嵌Linux操作系统,网络功能强大。     

嵌入式航天CCD相机控制器研制模板

航天CCD相机控制器的研制具有一定的复杂性,为了提高系统的安全性和可靠性,符合航天系统的可继承性要求,降低系统研制风险,提出了一种嵌入式航天CCD相机控制器研制模板。该模板采用了嵌入式的研制手段,使用自顶向下的研制方法,使得相机控制器的各个研制阶段都能从系统整体结构角度开展研制工作。将该模板应用到某型号的航天CCD相机控制器的研制过程中指导各个阶段的研制工作,不但可以较好地与航天系统研制过程结合,降低了可颠覆性风险的发生,而且取得了较高程度的嵌入式特性。     

改进Smith控制在主汽温控制上的应用研究

针对电站主汽温难控问题,尝试使用一种改进Smith补偿控制器,并应用多容惯性标准传递函数方法进行改进Smith补偿控制器的辅助控制器参数整定。结果表明：改进Smith补偿控制器用于电站锅炉主汽温控制是可行的并且比常规的PID控制在最优性和鲁棒性上优势明显;应用多容惯性标准传递函数方法进行辅助控制器参数整定是一种有效的易操作的参数整定方法。     

A low frequency AC to high frequency AC inverter with build-in power factor correction and soft-switching

This paper presents a full bridge AC-AC inverter for high frequency power distribution system with power factor correction stage controlled by a unified controller. The proposed inverter has the following features: 1) load independent output voltage with constant frequency and very low total harmonic distortion (THD); 2) soft switching of the full bridge switches for a wide range of input voltage and load conditions; 3) low DC bus voltage; 4) simple control and cost effectiveness for the power factor correction stage. Operating principles and performance characteristics are presented, and guidance to design the converter is given. Experimental results of a 90-265V/sub ac/ input, 30 V/sub ac/ output at 100 kHz, 250 W laboratory prototype are given to verify the theoretical and simulation results. The proposed ac-ac inverter is attractive for low power (up to 250 W) high frequency applications.     

一种神经网络控制器的容错设计与可靠性评估方法

本文以应用于电力控制系统中的人工神经网络快速汽门非线性适应控制器为例,详细论述了一种神经网络控制器的容错设计与可靠性评估方法,文中首先提出网络可靠性研究的重要性,以及本文所提出和容错设计与可靠性评估方法的通用性,然后详细介绍了一种神经网络快速汽门非线性适应控制器的设计结构和容错设计原理,最后根据设计的结果,得出了可靠性评估公式及其推广。