Optimal controller design for a matrix converter based surface mounted PMSM drive system

This paper proposes a new control algorithm for a matrix converter permanent magnet synchronous motor (PMSM) drive system. First, a new switching strategy, which applies a backpropagation neural network to adjust a pseudo DC bus voltage, is proposed to reduce the current harmonics of the permanent magnet synchronous motor. Next, a two-degree-of-freedom controller is proposed to improve the system performance. The parameters of this controller are obtained by using a frequency-domain optimization technique. The controller design algorithm can be applied in an adjustable speed control system and a position control system to obtain good transient responses and good load disturbance rejection abilities. The controller design procedures require only algebraic computation. The implementation of this kind of controller is only possible by using a high-speed digital signal processor. In this paper, all the control loops, including current-loop, speed-loop, and position-loop, are implemented by a 32-b TMS320C40 digital signal processor. The hardware, therefore, is very simple. Several experimental results are shown to validate the theoretical analysis.     

Design and implementation of a high-performance field-orientedinduction motor drive

The design and implementation of a high-performance controller for a field-oriented induction motor drive is presented. Dynamic modeling based on the stochastic technique is performed. Based on the estimated drive model, a two-degree-of-freedom controller is proposed so good dynamic responses in both the speed tracking and regulation characteristics can be achieved. The parameters of the controller are found using a proposed systematic design procedure according to the prescribed specifications. Having designed and tested the performance of the controller by simulation, the hardware implementation is successfully made, and some experimental results are given to demonstrate the effectiveness of the proposed controller     

Robust control of parallel DC-DC buck converters by combiningintegral-variable-structure and multiple-sliding-surface control schemes

We develop a robust controller for parallel DC-DC buck converters by combining the concepts of integral-variable-structure and multiple-sliding-surface control. The advantages of the scheme are its simplicity in design, good dynamic response, robustness, ability to nullify the bus-voltage error and the error between the load currents of the converter modules under steady-state conditions, and ability to reduce the impact of very high-frequency dynamics due to parasitics on the closed-loop system. We describe a method for determining the region of existence and stability of the sliding manifolds for such parallel converters. The results show good steady-state and dynamic responses     

太阳能与市电互补照明控制器的研究

文中介绍了一款以单片机为控制核心的太阳能与市电互补照明系统控制器的设计。控制器通过对蓄电池充电开关、放电开关和市电供电开关的控制,实现了系统中蓄电池管理和系统运行控制等功能。本文对该控制器的工作原理、硬件配置、软件设计、功能进行了详细论述,对其功能和工作特性进行了测试分析。结果表明,控制器各项功能完成良好,具有较高的实用价值和良好的应用前景。     

Buck-boost converter feedback controller design via evolutionary search

Buck-boost converters are switched power converters. The model of the converter system varies from the ON state to the OFF state and hence traditional methods of controller design based on approximate transfer function models do not yield good dynamic response at different operating points of the converter system. This article attempts to design a feedback controller for a buck-boost type dc–dc converter using a genetic algorithm. The feedback controller design is perceived as an optimisation problem and a robust controller is estimated through an evolutionary search. Extensive simulation and experimental results provided in the article show the effectiveness of the new approach.     

小型无人机飞行控制器硬件设计

从飞行控制系统设计的角度出发,介绍了基于AT91RM9200的小型化高性能无人机飞行控制器的硬件设计,并对设计中的关键软件技术进行了研究。该飞行控制器采用了优势突出的ARM—Linux嵌入式设计方案,具有广泛的应用前景。实践证明,该实现方法结构简单,功能强大,能够满足系统控制的要求,具有较高的实用性。     

A fuzzy sliding controller for nonlinear systems

It is well known that sliding-mode control can give good transient performance and system robustness. However, the presence of chattering may introduce problems to the actuators. Many chattering elimination methods use a finite DC gain controller which leads to a finite steady-state error. One method to ensure zero steady-state error is using a proportional plus integral (PI) controller. This paper proposes a fuzzy logic controller which combines a sliding-mode controller (SMC) and a PI controller. The advantages of the SMC and the PI controller can be combined and their disadvantages can be removed. The system stability is proved, although there is one more state variable to be considered in the PI subsystem. An illustrative example shows that good transient and steady-state responses can be obtained by applying the proposed controller     

Modellierung und Regelung eines piezoelektrischen Balkens

The use of smart structures in combination with modern control strategies offers new ways for the actor design. A good mathematical model and the determination of special mathematical structures are very important for the controller design. For a cantilever beam with two piezoelectric layers the equations of motion are derived by means of the Hamilton formalism. This system is a so-called Hamilton-AI-system and it possesses a special symplectic structure. The mathematical model of the investigated beam may be approximated by a transfer function of low order for the controller design. An optimal linear controller is designed and experimental results show the feasibility of the proposed approach.     

Mathematical Modeling and Nonlinear Controller Design for a Novel Electrohydraulic Power-Steering System

This paper is concerned with the mathematical modeling and nonlinear controller design of a novel electrohydraulic closed-center power-steering system. After a short introduction to the requirements of modern power-steering systems, the construction of the power-steering system under consideration will be described. The main advantage of this construction is the enhancement of the overall energetic efficiency of the steering system and the possibility of a variable steering assistance while keeping the good steering feeling of traditional hydraulic steering systems. Based on a detailed mathematical model of the essential components of the system, it is shown how some of the parameters of the system can be chosen to achieve an optimal dynamic behavior of the closed-loop system. The controller design proceeds in two steps: first, a nonlinear controller for the assistance force based on the differential flatness property of the system is designed, and afterwards, a steering torque controller using an impedance matching design is derived. Finally, measurement results of a test stand show the good performance and the robust behavior of the proposed control strategy     

Delay-Dependent Robust Control for Uncertain Stochastic Time-Delay Systems

This paper is concerned with controller design for uncertain stochastic systems with time-varying delays. The parametric uncertainties which appear in all system matrices are assumed to be norm bounded. Two cases of time-varying delays are investigated. Based on the slack matrix technique, delay-dependent stability criteria for the delayed stochastic systems are derived. By using the analysis results, linear matrix inequality-based controllers are designed. Three numerical examples are provided to demonstrate the effectiveness of the proposed method. This work was supported by the National Natural Science Foundation of China under Grants 60434020 and 60604003.     

基于ARM9嵌入式系统智能灭火机器人控制器设计

控制器是机器人的＂大脑＂。在详细分析了比赛用智能灭火机器人系统对控制器要求的基础上,选择比较合理的系统架构。内容具体分为软件设计和硬件设计两方面。在硬件方面采用ARM9作为灭火机器人的控制器核心,ARM9的采用保证了机器人在功能强大的同时拥有良好的扩展性,并且成本较低,易于普及。在软件方面给出了整体设计和沿墙走的流程图。实验证明,该系统设计合理,稳定可靠,达到了最初的设计目标,可以出色地完成灭火任务。     

特定需求液晶显示控制器的设计实现

为消除芯片供货受限对装置生产造成的影响,基于FPGA开发了兼容原软件驱动的LCD控制器,搭配主流的SDRAM显存芯片,对装置的相关硬件电路进行升级。所述LCD控制器采用模块化设计,系统分为主机端接口、显存控制器、仲裁器、寄存器、异步FIFO等多个功能子模块,子模块使用有限状态机方法建模,以Verilog语言编程实现,通过参数化配置,能够在保持原软件系统不变的情况下,灵活支持不同分辨率的显示模式,有效满足应用的多样化需求。开发的LCD控制器在样本电路上进行了实测,运行稳定,图像清晰,视觉效果良好。实践证明,LCD控制器的设计具有良好的可配置性、可复用性和可移植性,可以作为类似问题的有效解决方案。     

一种模糊-PI双模控制系统的仿真与设计

为了提高系统的控制性能,综合了模糊控制和PID控制的优点,提出一种基于模糊-PI双模控制器设计方法。典型的二维模糊控制器因缺少积分环节,难以消除稳态误差,控制的精度常常不能满足系统要求;而PI控制器具有良好的消除稳态误差的作用,所以将其与模糊控制器结合构成复合控制器。通过Matlab/Simulink仿真,结果表明,与经典的PID控制方式相比较,该控制方式在快速性、稳态性及准确性方面都有较大提高。     

视频格式转换系统中DDR控制器设计

提出了面向高清的视频格式转换系统,设计了一种基于状态机且适用于视频格式转换的DDR SDRAM控制器系统结构和状态转移控制流程.该控制器能实现2片DDR SDRAM乒乓读写切换,完成整个视频的传输.最后对控制器的电路进行了仿真,并在Xilinx的Spartan3E系列上实现了DDR SDRAM的连续读写,为集成电路技术...     

Deadbeat controller design for a soft-switched high-frequencyresonant rectifier

In this paper, a deadbeat controller design technique is developed for a quantum boost series resonant rectifier (QBSRR) to achieve the fast dynamic responses of the output voltage in the presence of any load variations, and in order to monitor the load information without employing the current sensor, the load estimation method is also derived. By using the information of the load estimation method, the proposed controller gain is automatically adjusted to have the system always keep the very fast dynamic responses. To verify these superior performances, the simulation and experiment are carried out     

研究多芯片组件互连延迟的一种新方法

延迟与冲激响应的矩有密切的关系,文中给出了建立在前三个矩基础上的多芯片组件互连延迟模型。该模型揭示了非单调输出树状结构ＭＣＭ互连网络的延迟与各设计参数之间的明确关系,因此它可以作为一种计算延迟的有效方法。进一步的研究结果还给出了输出响应与各设计参数之间的关系式,因此该模型又为研究面向性能的布局、布线算法中的有关问题提供了一种解决的途径。     

基于SoPC的通用TFT-LCD控制器IP核设计

在嵌入式系统中,IP核的使用已成为SoPC系统的重要组成部分,针对现有LCD控制器型号之间兼容性差的缺陷,提出了一种基于SoPCBuilder工具的参数化TFT-LCD控制器IP核的设计方法。用硬件描述语言进行通用TFT-LCD控制器的功能描述,将设计的控制器以IP核的形式添加到SoPCBuilder中去,供SoPC系统设计使用。进行设计验证,结果表明,该方法具有很好的通用性,也提高了系统的兼容性。     

The One-Wheel Cubli: A 3D inverted pendulum that can balance with a single reaction wheel

This article presents a novel 3D inverted pendulum that can balance on one of its corners using only a single reaction wheel. This is achieved by a careful design of the mass moment of inertia in such a way that the inertia along the two principal tilt axes is significantly different. The consequence is a time-scale separation of the underlying tilt dynamics, which renders the system controllable. We show that controllability is maximized when the ratio of the two principal inertia values amounts to the square of the silver ratio and discuss a sensor placement that minimizes variance in our tilt estimates. Both of these aspects lead to a principled design of the system. A model is derived from first-principles and used for delay compensation, state estimation, and to design a linear-quadratic regulator that stabilizes the highly underactuated system in its upright equilibrium. Thereby, the modeling and compensation of cantilever deflections, which arise from the lightweight design, is crucial. The article includes experimental results, which underline the efficacy of the system design and highlight an excellent balancing performance of the proposed feedback controller.     

光电跟踪系统控制器硬件设计

为了提高光电跟踪系统控制器的性能,文中对光电跟踪系统控制器的硬件部分进行了设计。首先给出光电跟踪系统控制器硬件电路框图。接着介绍最小系统的设计方案,其中包括存储器扩展,外部时钟,复位电路,电源电路,CPU板的抗干扰分析与设计等部分。最后对模拟量、数字量模块和通信模块设计进行了详细阐述。采用该控制器不仅增强了光电跟踪系统的灵活性和适应性,保证了系统性能要求,而且还具有良好的实时性。     

Total sliding-mode controller for PM synchronous servo motor driveusing recurrent fuzzy neural network

In this paper, the dynamic responses of a recurrent-fuzzy-neural-network (RFNN) sliding-mode-controlled permanent-magnet (PM) synchronous servo motor are described. First, a newly designed total sliding-mode control system, which is insensitive to uncertainties, including parameter variations and external disturbance in the whole control process, is introduced. The total sliding-mode control comprises the baseline model design and the curbing controller design. In the baseline model design, a computed torque controller is designed to cancel the nonlinearity of the nominal plant. In the curbing controller design, an additional controller is designed using a new sliding surface to ensure the sliding motion through the entire state trajectory. Therefore, in the total sliding-mode control system, the controlled system has a total sliding motion without a reaching phase. Then, to overcome the two main problems with sliding-mode control, i.e., the assumption of known uncertainty bounds and the chattering phenomena in the control effort, an RFNN sliding-mode control system is investigated to control the PM synchronous servo motor. In the RFNN sliding-mode control system, an RFNN bound observer is utilized to adjust the uncertainty bounds in real time. To guarantee the convergence of tracking error, analytical methods based on a discrete-type Lyapunov function are proposed to determine the varied learning rates of the RFNN. Simulated and experimental results due to periodic step and sinusoidal commands show that the dynamic behaviors of the proposed control systems are robust with regard to uncertainties