基于无线传感器网络的超洁净电源设计与应用

文中设计一种基于无线传感器网络的超洁净直流供电电路系统,该系统利用无线传感器网络技术实现同步控制,每一个网络节点就是一路直流输出,多路输出之间相互独立。系统设计中充分利用了无线传感器网络节点芯片中的单片计算机对电源电路中功率开关的控制,以此实现直流电能的传递,阻断输入电源引入的高频干扰。该电源电路经仿真分析以及电路测试,主要参数指标达到设计要求,为特殊电子设备的直流供电提供了解决方案。     

面向多传感器模块接入的低功耗无线传感器节点

设计了一种面向多传感器模块接入的低功耗无线传感器节点。该节点基于超低功耗Zigbee单片机MC13224V设计,由射频模块、配置电路和电源系统等组成。根据无线通信系统的特点设计了系统的软硬件,详细阐述了硬件设计、软件设计及性能测试方法。测试结果证明：在3V电源供电条件下,休眠时电流小于11μA,实现了低功耗设计的目的。     

基于LabVIEW的传感器测试实验系统设计与实现

为解决高校传统实验仪器带来的不足,实现传感器实验台数据的实时采集和处理,设计了一款基于LabVIEW的传感器测试实验系统。介绍了该系统的总体结构,给出了系统软硬件设计方案。使用传感器实验台的电容式传感器作为信号来源,信号经过不同的硬件设备实现同信号双通道的设计,数据采集卡将双通道信号传送至计算机,并重点通过合理配置LabVIEW软件实现双通道数据的实时采集和处理,提高了传感器实验的时间和精确度。实践证明该系统具有实时性强、运行稳定、精确度高等优点,可以满足高校传感器实验课程的需求。     

基于虚拟仪器的多通道MEMS 加速度计自动化测试系统

提出了一种7 通道并行测试的MEMS 加速度计自动化测试分析系统,该系统高度集成多种功能,实现了加速度计高效率测试与分析。在常规测试系统基础上,该系统通过上层应用程序Labview 实现了单一人机交互终端对振动台、高低温交变湿热试验箱和供电电源等设备的控制。灵敏度、线性度、重复性、滞回特性、温度特性、频响特性等参数指标,能够在控制终端通过分析测试数据同时获得,并以报表形式输出。在一般情况下,传感器测试效率可达50 只/h,大大高于传统的非自动化测试系统。经过评估测试,该测试系统还表现出较高的测试精度及稳定性和可靠性,测试误差小于2.5%。该自动化测试系统为进一步降低MEMS 传感器成本,促进其在物联网领域的大规模应用奠定了基础。     

电源测试系统的设计和实现

介绍了一种基于虚拟仪器远程电源自动化测试系统，首先阐述了系统的工作原理，然后根据基本测试功能和主要技术指标设计了电源自动化测试系统，阐述了其组成模块测试接口箱和工控机测试装置的结构和设计方法。最后对测试系统软件进行了详细讨论。测试系统软件是在Windows环境下利用Borland C^ Builder5开发的，采用了模块化编程方法，该系统采取了抗干扰措施，大大提高了测试精度和测试效率，经过现场调试，现已投入运行，实现了电源系统的远程自动化测试。     

基于ZigBee的电源监控系统设计与实现

针对电源监控功耗过大,精度不高的问题,提出一种基于ZigBee的电源监控系统设计方法。首先进行电源监控系统的整体结构设计,设计主控芯片及外围电路;然后进行电源监控系统的硬件模块化设计,主要包括传感器模块、ZigBee核心控制模块、主控电路、复位电路、同步时钟设计和信号调理电路设计等。采用ARM Cortex-M0处理器内核实现电源监控系统集成设计;最后进行系统的电路调试测试分析,测试结果表明,采用该设计系统具有较高的电源监控调理性能,功耗较小,输出功率增益较大,具有较高的控制品质。     

基于高精度电压／电流LEM模块的双通道传感器测试电源

简要介绍了电压／电流传感器测试电源的用途及应用场合，针对常规电压和电流传感器的特点，采用高精度电压／电流LEM模块为基准源，设计了一种双通道隔离型主电路拓扑及控制系统（并留有上位机控制和检测端口），并给出了该电源的技术参数。试验结果表明，该电源可以用于传感器的标定、多传感器一致性检测等方面。     

基于比率测量的CMOS高温温度传感器设计

针对在高温环境下温度传感器的测量性能降低问题,提出了一种在能够25℃~ 225℃的温度范围内运行,基于比率测量的高性能带隙温度传感器。该温度传感器使用简单的时域体系结构,将自动调零的偏移消除与偏移消除进行合并提高性能,然后通过在数字处理模块实现的映射函数,将得到的比率转换成比率输出,从而消除对带隙基准（BGR）的需要,提高了高温条件下的精确性。传感器使用CMOS工艺组装而成,芯片面积为0.41 mm2。在室温下使用现场可编程门阵列(FPGA)进行实验测试,结果显示该传感器在最差情况下的错误仅为+1.6 ℃/?1.5 ℃,并且当电源为4.5V时,传感器仅消耗20μA的电流。     

基于虚拟仪器的直升机电源综合测试系统

介绍了一种直升机电源特性综合测试系统的设计方法,该系统采用现场总线测试技术,使用虚拟仪器编程语言LabWindows/CVI6.0设计了直升机各种供电特性参数的测试算法,实现了数据的多通道同时快速采集以及并行同步采集。虚拟仪器面板的交互式使用,使界面操作简单、便捷。实践证明该电源综合测试系统设计先进,稳定可靠,测试结果达到了要求的精度,可对被测对象的电气特性是否达到国军标要求进行评估。     

用于通信电源测试的功率谐波分析仪

通信电源的质量稳定与否，对整个通过信网络的稳定和可靠畅通至关重要，直接影响到通信质量，为了通信网络的正常运行，必须运用适当的检测设备，对通信电源的输入和输出各项技术指标进行测试，以保证其符合有关的标准和技术规范，文中介绍了国内外电源专家广泛使用的PM系统功率谐波分析仪，其能满足通信电源研制生产和运行维护的测试要求。     

A novel converter topology for multiple individually regulated outputs

Power supply voltages in digital systems have reduced considerably in recent years, and often digital components requiring different voltages are present on the same board. This has increased the demand for multiple output power distribution systems with tight individual load voltage regulation. This paper presents a power distribution system having a central power supply that acts as a controlled current source whose output is connected to individual loads on a time shared basis. All the magnetics are concentrated in the converter acting as the current source. The current source can be realized by a current controlled buck, buck-boost, or single-ended primary inductance converter (SEPIC). First, a comparative analysis of buck, buck-boost, and SEPIC based implementation of the current source is carried out. Next, a buck-based current source implementation with constant frequency pulse-width modulation control for the output voltages is described. Detailed component and control design, simulations, and experimental results for a 100-W prototype are presented.     

Compensation voltage control in dynamic voltage restorers by use of feed forward and state feedback scheme

This paper discusses the control of the compensation voltages in dynamic voltage restorers (DVR). It first analyzes the power circuit of a DVR system in order to come up with appropriate control limitations and control targets for the compensation voltage control. Based on this power stage analysis, a combined feed forward and state feedback control structure for the compensation voltages of DVRs is developed. This paper also discusses the time delay problems inherent in the digital control system of a DVR. Digital control systems normally have control delay from the sampling period, the switching frequency of the inverter, the sensor transmission time, etc. The control delay increases the dimension of the system transfer function. This makes the control system more unstable. This paper analyzes the control performance related with the control delay, closed loop damping factor, and the output filter parameters in DVR systems. Based on the control system analysis, design guidelines are proposed for the control gains and the inverter switching frequency of DVRs. The proposed theory is verified by an experimental DVR system with a full digital controller.     

光子晶体光纤压力传感器光源方案设计

文章推导出PCF压力传感器检测基本原理,设计出PCF压力传感器典型系统结构,分析了PCF压力传感器对光源的特殊性能要求,选择半导体激光器(LD)作为传感器系统光源。提出LD工作稳定性整体控制设计方案,采用路分析方法给出LD中噪声控制模块、功率控制模块、温度控制制模块和波长控制系统。在LD中通过噪声、功率和温度控制等能够有效保障LD工作稳定性,保障PCF压力传感器系统对压力测量的精确性。     

On the use of current sensors for the control of power converters

This paper describes the use of current sensors for the control of power converters. No voltage sensor is required in the whole system. The sensed current and the rate of change of the inductor current in different circuit topologies are used to determine the input and output voltages of the converters, and for current programming and maximum current protection. Apart from reducing the number of sensors, the proposed method provides inherent electrical isolation between the power conversion stage and the controller and lessens noise-coupling problems. The proposed technique is illustrated with a current-programmed DC/DC boost regulator with feedforward and feedback control. The regulator's steady state and transient responses under input source and output load disturbances are presented.     

数字温度传感器的带隙基准电压源设计

为了实现温度传感器的数字化输出,设计出一种不随温度变化的带隙基准电压源电路。与传统带隙基准电压源相比较,该电路利用温度系数相反的物理量加权相加得到基准电压,同时在电路中利用斩波调制解调技术,消除运算放大器失调电压的影响。仿真结果表明,该电路的温度系数小于10ppm,电源调整率低,在频率为10KHz时,电源电压抑制比为-66.27d B左右,加入失调电压可以被斩波完全消除。     

基于PLC的电子装备自动测试系统设计

传统方法对电子装备自动测试系统的测试时间较长,提出基于PLC的电子装备自动测试系统设计.在硬件设计上,设计气源处理装置,为整个自动测试系统的运行提供气压;设计物料检测传感器,传输测试过程中的电信号;设计测试限位开关与激励源模块,并选择适合系统的PLC器件,辅助系统整个测试过程的进行.在软件设计上,建立整个系统的数据库平...     

基于USB的高清彩色CCD图像采集系统

提出一种基于USB的彩色CCD高清图像采集系统设计方案。图像数据的来源采用的是SONY公司的ICX205AK芯片,结合USB2.0接口,复杂可编程逻辑器件CPLD设计了一个高速的彩色CCD图像采集系统。文中详细阐述了系统内不同模块的硬件电路设计思路和软件运行流程。整个系统由电源系统、CCD传感器、A/D模数转换器、CPLD控制器、USB2.0高速接口、上位机控制程序等各个部分组成。本系统的硬件电路可以协调正常工作完成分辨率为140万的高清图像采集,最高采集帧率达7.5 frame/s。     

A Low-Loss Built-In Current Sensor

This paper presents a novel built-in current sensor that uses two additional power supply voltages besides the system power supply voltage, and that is constructed by using a current mirror circuit to pick up an abnormal IDDQ. It is activated only by an abnormal quiescent power supply current and minimizes the voltage drop at the terminal of the circuit under test. Simulation results showed that it could detect 16-A IDDQ against 0.03-V voltage drop at 3.3-V VDD and that it reduced performance degradation in the circuit under test. It is therefore suitable for testing low-voltage integrated circuits. Moreover, we verified the behavior of the sensor circuit implemented on the board by using discrete devices. Experimental results showed that the real circuit of the sensor functioned properly.     

An Optimization-Based Algorithm for Shunt Active Filter Under Distorted Supply Voltages

In this paper, an optimization-based control algorithm for the compensation of steady-state load under distorted supply voltages is presented. For balanced and sinusoidal supply voltages, load compensation using shunt active filter produces perfect harmonic cancellation (PHC) and unity power factor (UPF) source currents. However, when the supply voltages are distorted, compensation for PHC will not provide UPF, as the harmonics in the supply voltages are not utilized for delivering the average power. In the same way, to achieve UPF source currents, the compensated source currents should have the same harmonics, unbalance, shape, and be in phase with the respective supply voltages, thereby violating the perfect harmonic cancellation objective. Hence, there should be an optimal operation between these two important compensation characteristics. The optimization-based control algorithm presented in this paper gives the best power factor while satisfying the constraints such as total harmonic distortion limits and average power balance of source currents. It is also flexible to adopt different compensation characteristics based upon the supply voltage conditions. Matlab and its optimization toolbox are used for simulation studies and solving the nonlinear optimization problem, respectively. The algorithm is validated by using a prototype of digital signal processor (TMS320F2812PGFA)-based shunt active power filter. Detailed experimental results are presented.     

New hybrid active power filter for harmonic current suppression and reactive power compensation

In the case of undistorted and balanced grid voltages, low ratio shunt active power filters (APFs) can give unity power factors and achieve current harmonic cancellation. However, this is not possible when source voltages are distorted and unbalanced. In this study, the cost-effective hybrid active power filter (HAPF) topology for satisfying the requirements of harmonic current suppression and non-active power compensation for industry is presented. An effective strategy is developed to observe the effect of the placement of power capacitors and LC filters with the shunt APF. A new method for alleviating the negative effects of a nonideal grid voltage is proposed that uses a self-tuning filter algorithm with instantaneous reactive power theory. The real-time control of the studied system was achieved with a field-programmable gate array (FPGA) architecture, which was developed using the OPAL-RT system. The performance result of the proposed HAPF system is tested and presented under nonideal supply voltage conditions.