优化隔离传感器接口的功率转换

过去,模拟接口板的通道数不多,因此板上有足够的空间可用来设计适当的DC-DC转换器,以便为传感器接口提供电源。一个模块只有一两个接口,因此功耗不是什么大问题。而目前,模拟PLC模块(如图1所示)能够提供4个、8个甚至16个独立的隔     

一种用于消化道酸碱度监测的传感器接口芯片

介绍了一款用于消化道酸碱度监测的专用接口集成电路芯片。该电路包含了信号放大电路、模数转化电路等,可以同时测量温度信号。芯片采用0.18 μm CMOS工艺实现,芯片大小仅为0.6 mm×0.4 mm,配合酸碱度传感电极和无线收发模块可制成消化道无线监测智能胶囊。对该芯片进行测试,结果显示,电路工作状态良好,可精确地采集信号,酸碱度检测的精度可以达到±0.1 pH,温度检测精度可达±0.2 ℃。     

基于单片机的智能传感器CAN总线接口硬件设计

近年来,CAN总线具有的高可靠性和良好的错误检测能力受到重视,被广泛应用于汽车计算机控制系统和环境温度恶劣、电磁辐射强和振动大的工业环境,本设计应用单片机、控制器SJA1000和82C250收发器,外接上看门狗电路芯片X5045P及高速光耦合器6N137来实现智能传感器CAN总线接口的设计.     

嵌入式系统中模拟传感器的接口设计

嵌入式系统中的嵌入式芯片所处理的信号分为两类：数字信号与模拟信号。模拟信号通常来自于传感器,图1所示为部分传感器的照片及其检测的物理量,这些传感器大都输出模拟的电信号。     

全集成距离和环境光传感器

VCNL4020X01是AEC—Q101认证的,工作温度可达＋105℃的新款全集成距离和环境光传感器。该传感器在4．8mm×2．3mm×0．8mm矩形无引线（LLP）封装内集成了一个红外发射器、一个探测距离的光电二极管、一个环境光探测器、一个信号处理IC和一个16位ADC。这颗三合一传感器具有中断功能,支持I^2C总线通信接口,在各种汽车、消费和工业应用中能极大简化窗口和传感器的摆放位置设计。     

以PIC16C66单片机为CPU的多费率电能表接口设计

本文介绍了以MICROCHIP公司的PIC16C66单片机为CPU的多费率电能表接口设计。该表用ADE7755作为计量芯片，采用液晶显示并具有RS485接口和红外通讯两种通讯方式。     

低功耗智能传感器的设计

在工业控制过程中,经常需要对一些参数进行测量,而一般传感器的输出信号较弱,不适合作远距离传输。为了减小干扰,通常采用4～20mA电流输出的双绞线变送器。信号模拟处理的变送器,由于电路的复杂性的限制,非线性补偿效果不理想,很难在全温度范围内实现温度补偿,因此达不到较高的精度要求。随着低功耗高精度单片机、∑-△ADC和∑-△DAC的日益普及,为高精度的智能变送器的设计提供了技术途径。     

适用于传感器接口的可编础大器

现今大多数的电子仪器均属于嵌入式系统,内含传感器、缓冲和放大信号的放大器、模拟／数字转换器和一个数据处理和使用者接口的微控制器,像是数据撷取系统和数据记录器等。图1表示一个典型设有USB接口的数据撷取系统的区块图。     

MAX9921：高度可靠的霍耳传感器接口集成方案

霍耳效应的原理是磁场与导体中流过的电流相垂直时,流过电流的导体两侧会出现电势差。霍耳效应传感器基于这一原理检测磁场的变化,输出与之成比例变化的电压,可以实现无接触检测,因此能够实现可靠的封装,不受环境因素的影响。     

A Fieldbus-based intelligent sensor

This paper presents an infrastructure and its function of an intelligent sensor based on a frequency output sensor and Fieldbus. The intelligent sensor embeds the extra functionality into a sensor/instrument, given the availability of internal computing power and digital communications. An approach to designing the intelligent sensor based on Fieldbus is presented. With the approach, the functionality of self-calibration, self-compensation, self-validation and comprehensive communication of the sensor is described. An intelligent sensor applying computing algorithms for separating sensor data errors and predicting sensor status is introduced. An algorithm for blind source separation is introduced. In the end the test results and conclusions are provided.     

The development of an intelligent user interface for NASA's scientific databases

The National Space Science Data Center (NSSDC) has initiated an Intelligent Data Management (IDM) research effort which has as one of its components, the development of an Intelligent User Interface (IUI). The intent of the IUI effort is to develop a friendly and intelligent user interface service that is based on expert systems and natural language processing technologies. This paper presents the design concepts, development approach and evaluation of performance of a prototype Intelligent User Interface Subsystem (IUIS) supporting an operational database.     

嵌入式智能高压带电传感器的设计

深入剖析PASS开关接地刀闸合闸的闭锁功能,在此基础上设计出以MSP430F2012单片机和AD623仪表放大器为主体的智能高压带电传感器,同时配合能精确感应高压导体带电状态信息的高压传感探头,实现可控制闭锁功率继电器的触点状态及接地刀闸的带电闭锁功能.该传感器结构具有简单、体积小等特点,在不改变现有PASS主体结构的情况下,可有效解决原有技术存在的设备造价昂贵、功能过剩问题.     

Agent-based framework for intelligent natural language interface

In this contribution, we present a framework for an intelligent natural language interface (NLI) that suits the need of embedded platform, using agent-based approach. The proposed framework is motivated by an ongoing speech technology research project aimed at developing a generic synthesizer for information disseminating systems in local languages. The architecture is based on various forms of action representations with a sequence of transformations that converts users’ input (text or speech) into a suitable set of agent actions that produce response to the input. This approach incrementally minimizes the complexity and ambiguity of the natural language input by using predefined sets of interim actions at different levels, hence, increasing the robustness and reliability of the NLI.     

温度传感器接口与电源控制

本文讨论了数字输出温度传感器的连接方式,并给出了几种应用,其中包括对某些大功率交流电源的控制。     

基于光学传感器的智能玩具小车设计

智能机器人在当今社会的应用越来越广泛.从普通的玩具机器人到工业控制机器人,从能够炒菜的机器人到可以进行太空探测的机器人,可以预见今后智能机器人的应用将更加广泛.普通的无线遥控车大家都很熟悉,任天堂的电玩WII大家也都觉得很神奇.     

自适应传感器模块(ASIM)设计

基于FPGA提出一种将各种不同类型的传感器接口(如UART接口)转化为统一规范的USB接口的设计方案,从而实现PC机对传感器接口采集的数据快速读写。简单介绍USB控制器的Verilog HDL实现方法,并应用QuartusⅡ和NiosⅡ软件搭建自适应传感器系统模块,通过数据传输对该系统进行验证,模拟了UART接口转换为USB接口的实现方法。     

An integrated CMOS interface for lambda sensor

Automotive pollution can be reduced by suitably controlling the mixture that is fed to the cylinders. This can be performed by means of a feedback loop including a lambda sond and a processing unit which controls the electronic fuel injectors. This paper describes a CMOS interface which adapts the output signal of a lambda sensor to allow its feeding into the processing unit. It provides a differential to a single-ended conversion with a good common mode rejection, a level shifting around a given reference voltage, and an accurate voltage gain. Both design considerations and the measurements performed on an integrated test structure are presented. The measured variation of the large-signal voltage gain for an input signal of 0 to 1 V is within ±5% when the input common mode voltage ranges from -1 V to 1 V with respect to the negative supply voltage. An output voltage with a precision within ±1 mV is obtained in the presence of an input voltage corresponding to the stochiometric composition of the mixture     

基于嵌入式的传感器网络智能控制端设计与实现

由于用户信息量庞大且多样,使得传统智能控制端嵌入式操作系统无法对其进行有效控制,能耗不稳且控制效率低。因此,构建能耗稳定且控制效率高的智能控制端嵌入式操作系统,该系统由传感器网络和终端组成。传感器网络由采集模块、微处理模块和智能通信模块组成。采集模块利用PT100传感器采集传感器网络节点信号,并经由AD7793模/数转换器将初始信号转换成电流信号和电压信号。微处理模块集中管理采集模块传输来的信号,并将管理后的信号传输到智能通信模块中进行多步处理,以获取电压和电流的最终信号。终端管理整个系统的工作流程,并通过处理电压和电流的最终信号,提供给用户多种控制指令。软件给出了终端控制信号采集工作的流程图,以及系统调用电压和电流最终信号的代码语言。实验结果表明,所设计系统拥有能耗稳定、控制效率高的特点。