基于FPGA的LCoS显示驱动系统的设计与实现

研究了硅基液晶(LCoS)场序彩色显示驱动系统的设计与实现。该系统以FPGA作为主控芯片,用两片高速DDR2SDRAM作为帧图像存储器。通过对图像数据以帧为单位进行处理,系统将并行输入的红、绿、蓝数据转换成串行输出的红、绿、蓝单色子帧。将该驱动系统与投影光机配合,实现了分辨率为800×600的LCoS场序彩色显示。

Fuzzy PID Controllers Using FPGA Technique for Real Time DC Motor Speed Control

The design of intelligent control systems has become an area of intense research interest. The development of an effective methodology for the design of such control systems undoubtedly requires the synthesis of many concepts from artificial intelligence. The most commonly used controller in the industry field is the proportional-plus-integral-plus-derivative (PID) controller. Fuzzy logic controller (FLC) provides an alternative to PID controller, especially when the available system models are inexact or unavailable. Also rapid advances in digital technologies have given designers the option of implementing controllers using Field Programmable Gate Array (FPGA) which depends on parallel programming. This method has many advantages over classical microprocessors. In this research, A model of the fuzzy PID control system is implemented in real time with a Xilinx FPGA (Spartan-3A, Xilinx Company, 2007). It is introduced to maintain a constant speed to when the load varies.,The model of a DC motor is considered as a second order system with load variation as a an example for complex model systems. For comparison purpose, two widely used controllers “PID and Fuzzy” have been implemented in the same FPGA card to examine the performance of the proposed system. These controllers have been tested using Matlab/Simulink program under speed and load variation conditions. The controllers were implemented to run the motor as real time application under speed and load variation conditions and showed the superiority of Fuzzy-PID.

基于FPGA的LCoS微显示器的数字伽马校正

本文针对微显示芯片LCoS的伽马校正问题,对比了传统模拟校正伽马与数字校正伽马的优缺点,同时提出了16段线性数字Gamma校正,此方法基于FPGA实现,在驱动源端对数据进行分段线性点对点校正,这样不仅可以省去LCoS内部DAC电阻匹配部分,而且可以实现RGB三色各自的Gamma校正,有效提高了灰阶精度,且具有很大的配置灵活性。

Development of FPGA Based NURBS Interpolator and Motion Controller with Multiprocessor Technique

The high-speed computational performance is gained at the cost of huge hardware resource,which restricts the application of high-accuracy algorithms because of the limited hardware cost in practical use.To solve the problem,a novel method for designing the field programmable gate array(FPGA)-based non-uniform rational B-spline(NURBS) interpolator and motion controller,which adopts the embedded multiprocessor technique,is proposed in this study.The hardware and software design for the multiprocessor,one of which is for NURBS interpolation and the other for position servo control,is presented.Performance analysis and experiments on an X-Y table are carried out,hardware cost as well as consuming time for interpolation and motion control is compared with the existing methods.The experimental and comparing results indicate that,compared with the existing methods,the proposed method can reduce the hardware cost by 97.5% using higher-accuracy interpolation algorithm within the period of 0.5 ms.A method which ensures the real-time performance and interpolation accuracy,and reduces the hardware cost significantly is proposed,and it’s practical in the use of industrial application.

Implementation on FPGA of Neuro-Genetic PID Controllers Auto-Tuning

The present paper studies the use of genetic algorithm to optimize the tuning of the Proportional, Integral and Derivative (PID) controller. Two control criteria were considered, the integral of the time multiplied by the absolute error (ITAE), and the integral of the time multiplied by the absolute output (ITAY). The time variant plant tested is a first-order plant with time delay. We aim at a real time implementation inside a digital board, so, the previous continuous approach was discretized and tested;the corresponding control algorithm is presented in this paper. The genetic algorithms and the PID controller are executed using the soft processor NIOS II in the Field Programmable Gate Array (FPGA). The computational results show the robustness and versatility of this technology.

LCoS场序彩色显示控制器的设计

介绍了一种采用LCoS显示芯片的场序彩色显示控制器的设计方案,该方案采用VHDL语言进行设计,在Xilinx公司的Fundation2.1i环境中,进行了编译、综合和仿真。并通过XCS系列FPGA进行了功能验证。对显示控制器的各部分电路功能进行了讨论,给出了具体的设计方案和实现方法。

高亮度LCoS微显示器的接口设计

为了提高LCoS微显示器的亮度 ,提出了双拍存储伪并行的驱动方式 ,设计了适用于高亮度LCoS微显示器的接口ASIC(专用集成电路 ) ,从而使LCoS微显示器的亮度可以提高数倍 。

基于SOPC适用于不同规格LCOS的控制器设计

通过在现场可编程门阵列器件中构建软核处理器(NiosⅡ)来代替专用集成电路,并在NiosⅡ中嵌入C程序,根据给定的规模,自动实现了在不同规模下的各种设计参数的计算。实现了只需要输入系统参数,就能适用于不同规模LCOS控制器的设计,并且结合USB芯片和特定的程序流程,提高了LCOS控制器的适用性和可靠性,降低了器件的成本。

单片彩色LCoS显示系统的设计实现

单片彩色LCoS显示系统体积小,成本低,光学系统简单,易于实现小型化,应用前景广泛。对单片彩色LCoS显示系统的显示原理进行研究,并使用FPGA作为主控芯片实现该显示系统。对主控模块的设计与实现做了详细的叙述,包括主要模块的划分及其算法。由于LCoS器件的限制,所设计的单片彩色LCoS显示系统还存在一些问题,对这些问题的解决方法做了探索,提出如何提高显示质量的一些方法。

高分辨率彩色LCoS头盔显示器电路系统的设计与实现

介绍了分辨率为1024×768,子场刷新频率为180Hz的硅基液晶(LCoS)彩色头盔显示器电路的总体设计,并详细阐述了其中关键模块的设计与实现。使用高速SDRAM替换SRAM作为帧存储器,为高分辨率显示提供了足够的容量和带宽;借助基于FPGA的高速低压差分信号(LVDS)数据传输成功实现了系统的模块化设计,有效地减轻了头盔显示器的重量,将放入头盔的PCB面积减少到46mm×56mm。经对样机进行测试,结果表明,系统工作稳定可靠,能够实现高分辨率彩色图像的实时显示,而且图像清晰。

基于FPGA的锻锤安全控制模块设计

近年来,随着工业化进程的发展,工业控制系统对安全操作的需求也随之提升。FPGA以响应时间短、功耗低、安全可靠等特点得到广泛应用。基于FPGA设计了一种锻锤操作的安全控制模块,可以同时对锻锤设备的多个控制信号进行实时监测,在设备发生故障时及时提醒工作人员停止操作,避免生产事故的发生。

Development of fuzzy control of a fuel cell generation system using FPGA

Afuzzy controller based oni mproved Generalized-Membership-Function(GMF) algorithmfor afuel cell generationsys-tem wasintroduced.Under the demands on control in application of the converter,a Field Programmable Gate Array(FPGA) re-alization method to manage the power flow was given.This control systembased onthe proposed modified GMF was proved to bea universal approxi mation systemin theory.The fuzzy control technique was combined with Eletronic Design Automatic(EDA)technique and a paralleling fuzzy controller was i mplemented in FPGA.Paralleling fuzzy controller based oni mproved GMF algo-rithm wasi mplemented on a Cyclone FPGA.The result of si mulation based on QuartusII confirmed the validity of the proposed method.

基于FPGA的PMLSM三矢量模型预测电流控制IP核设计及硬件在环验证

为了提升永磁直线同步电机(PMLSM)电流控制的稳态性能和执行速度,同时降低资源消耗,基于现场可编程门阵列(FPGA)设计了一个三矢量模型预测电流控制(TV-MPCC)知识产权(IP)核,并利用FPGA在环可视化验证方法,建立了一个PMLSM的TV-MPCC IP核验证系统。通过Simulink对TV-MPCC策略进行算法级仿真,并优化了基本电压矢量的作用顺序;采用并行与资源共享硬件优化技术设计并封装了一个TV-MPCC IP核,并对其进行了功能仿真;将设计部署在FPGA芯片XC7Z020CLG400-2上,利用FPGA在环可视化验证平台进行实验研究。结果表明,TV-MPCC策略下d、q轴电流跟踪误差和电流脉动均降低90%以上;FPGA工作在100 MHz下,实现一次算法的时间为0.62μs,仅为软件PyCharm执行时间的0.414%。

A multi-directional controllable multi-scroll conservative chaos generator:Modelling,analysis,and FPGA implementation

Combing with the generalized Hamiltonian system theory,by introducing a special form of sinusoidal function,a class of n-dimensional(n=1,2,3)controllable multi-scroll conservative chaos with complicated dynamics is constructed.The dynamics characteristics including bifurcation behavior and coexistence of the system are analyzed in detail,the latter reveals abundant coexisting flows.Furthermore,the proposed system passes the NIST tests and has been implemented physically by FPGA.Compared to the multi-scroll dissipative chaos,the experimental portraits of the proposed system show better ergodicity,which have potential application value in secure communication and image encryption.

DSP ＆ FPGA-based control architecture for a highly integrated robot hand with enhanced impedance performance

A novel control system is developed to improve the capabilities of robet hand performing tasks in a variety of environments. A joint impedance control strategy has been successfully implemented in the low level control of a highly integrated robot hand. At flint, a real time controller with DSP＆FPGA-based multilevel control architecture is built. Then a current sensor of the single direct current （DC） link is used to measure and reconstruct the three phase currents, and a stable current signal is measured by optimizing sample instant. The experimental results of the joint impedance control show that the proposed method not only improves the effectiveness of contact environment performance, but also provides compliant interaction of robot hand with a person, which is very important for the development of friendly human robot of the next generation.

Synthesis of Nonlinear Control of Switching Topologies of Buck-Boost Converter Using Fuzzy Logic on Field Programmable Gate Array (FPGA)

An intelligent fuzzy logic inference pipeline for the control of a dc-dc buck-boost converter was designed and built using a semi-custom VLSI chip. The fuzzy linguistics describing the switching topologies of the converter was mapped into a look-up table that was synthesized into a set of Boolean equations. A VLSI chip–a field programmable gate array (FPGA) was used to implement the Boolean equations. Features include the size of RAM chip independent of number of rules in the knowledge base, on-chip fuzzification and defuzzification, faster response with speeds over giga fuzzy logic inferences per sec (FLIPS), and an inexpensive VLSI chip. The key application areas are: 1) on-chip integrated controllers;and 2) on-chip co-integration for entire system of sensors, circuits, controllers, and detectors for building complete instrument systems.

FPGA Based Speed Control of SRM with Optimized Switching Angles by Self Tuning

The electromagnetic torque and speed in Switched Reluctance Motor (SRM) greatly depend on the excitation parametersi.e. turn-on angle, turn-off angle, dwell angle and magnitude of the phase currents of its phases. At lower speeds, a change in the current contributes the torque requirement which can be achieved either by voltage control (pulse width modulation) or instantaneous current control techniques. At high speeds, due to high back EMF, the regulation of current is crucial and achieved with the control of switching angles of phases. This type of control is referred as average torque control, where the torque is averaged over one stroke (2π/Nr). With constant dwell angle, advancing the phase angle influences the current into the phase winding at minimum inductance position. It has more time to get the current out of the phase winding before the rotor reaches the negative inductance slope. To maintain the speed of the motor at different load conditions, the turn-on and turn-off angles are adaptively varied. The change in dwell angle may be required where the turn-on and turn-off angle may not be sufficient to reach the required speed. In this paper, a new algorithm is proposed for self tuning of switching parameters of SRM. The proposed algorithm is simulated in MATLAB-Simulink and experimentally validated with Field Programmable Gated Array (FPGA) using MATLAB- system generator environment.

FPGA Implementation of Predictive Hysteresis Current Control for Grid Connected VSI

Grid connected voltage source inverters (VSIs) are essential for the integration of the distributed energy resources. Hysteresis current control (HCC) is a commonly employed method for power control of VSIs. This control method, in contrast with voltage control, provides good dynamics, good stability and implicit over current protection. However, the most important concern of digital implementation of HCC is related with the sampling period of the measured currents. This paper presents a predictive hysteresis current control (HCC) for grid connected voltage source inverter and its FPGA implementation. Simulation and experimental results are provided to verify the validity of the proposed implementation.

基于FPGA和机器视觉的多元特征模式水果分拣系统

水果自动分拣系统可以解放重复性人力劳动,提高工作效率,消除主观因素,提高工作科学化客观化。然而,目前水果分拣系统成本较高,尚无法大规模应用。因此,在FPGA平台上设计了基于多元特征机器视觉的低成本边缘式水果分拣系统。根据多元特征识别模式ZWM,定义了多元特征向量集和识别模式向量集等概念,进而建立了水果多元特征识别体系,可实现水果分类和水果分级识别。之后,通过将识别参数转化为舵机控制信息,机械臂可将识别出的水果搬运到指定位置,达到自动智能分拣效果。进而该系统可结合云端平台,通过手机实现分拣的远程控制。所提出的基于多元特征的低成本水果分拣系统,能够实现完成物品分类和分级融合分拣,可推动水果智能分拣系统的发展。

国产FPGA通用以太网控制器的设计与实现

目前由于国际芯片供应链的不稳定性,我国在FPGA领域面临着重要的工程应用替代挑战,尤其是在人防工程领域,大规模的工程项目急需国产FPGA技术来满足需求.因此,本文针对实时通信领域,特别是物联网网关的以太网控制器应用,进行了国产化替代的研究.首先,在中科亿海微国产FPGA上,设计了基于流水线处理的兼容ARP、UDP、IP、ICMP等多种协议的UDP协议栈以及基于真双端口RAM和异步FIFO的兼容三速以太网的处理模块,实现了三速以太网控制器在国产FPGA上的部署及应用.并且考虑到国产FPGA现有的IP库不全的因素,本设计只采用了常用的FIFO和RAM的IP进行设计,方便了后续移植到其他国产FPGA上的需求.最后,本设计对部分模块进行了仿真测试,仿真测试表明,该控制器可以实现UDP协议传输、主动ARP、被动ARP、ARP表查询、ping、多协议优先级仲裁等功能,足够满足物联网网关中以太网控制器的使用需求.